US20030094319A1 - Vehicle body interchangeability - Google Patents

Abstract

A method is provided for modifying the functionality and aesthetic characteristics of a vehicle. The method includes removing a first body from a vehicle chassis, wherein the first body and vehicle chassis form a first type of vehicle. A second body is then attached to the vehicle chassis without subjecting the second body to significant value-added manufacturing processes. The second body and vehicle chassis form a second type of vehicle different from the first type of vehicle and having different functionality and aesthetic characteristics. The bodies and chassis comply with a standardized body/chassis interface system which enables such interchangeability of bodies on a single chassis, or on a family of chassis.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS
• This application claims the benefit of U.S. Provisional Application Nos. 60/314,501 and 60/337,994, filed Aug. 23, 2001 and Dec. 7, 2001, both of which are hereby incorporated by reference in their entirety.[0001]
TECHNICAL FIELD
• The present invention relates to a vehicle body interchangeability process wherein a vehicle chassis is provided with a common interface system engageable with any of a plurality of different interchangeable bodies having different body styles.[0002]
BACKGROUND OF THE INVENTION
• Mobility, being capable of moving from place to place or of moving quickly from one state to another, has been one of the ultimate goals of humanity throughout recorded history. The automobile has likely done more in helping individuals achieve that goal than any other development. Since its inception, societies around the globe have experienced rates of change in their manner of living that are directly related to the percentage of motor vehicle owners among the population.[0003]
• Prior art automobiles and light trucks include a body, the function of which is to contain and protect passengers and their belongings. Bodies are connected to the numerous mechanical, electrical, and structural components that, in combination with a body, comprise a fully functional vehicle. The nature of the prior art connections between a vehicle body and vehicular componentry may result in certain inefficiencies in the design, manufacture, and use of vehicles. Three characteristics of prior art body connections that significantly contribute to these inefficiencies are the quantity of connections; the mechanical nature of many of the connections; and the locations of the connections on the body and on the componentry.[0004]
• In the prior art, the connections between a body and componentry are numerous. Each connection involves at least one assembly step when a vehicle is assembled; it is therefore desirable to reduce the number of connections to increase assembly efficiency. The connections between a prior art body and prior art vehicular componentry include multiple load-bearing connectors to physically fasten the body to the other components, such as bolts and brackets; electrical connectors to transmit electrical energy to the body from electricity-generating components and to transmit data from sensors that monitor the status of the componentry; mechanical control linkages, such as the steering column, throttle cable, and transmission selector; and ductwork and hoses to convey fluids such as heated and cooled air from an HVAC unit to the body for the comfort of passengers.[0005]
• Many of the connections in the prior art, particularly those connections that transmit control signals, are mechanical linkages. For example, to control the direction of the vehicle, a driver sends control signals to the steering system via a steering column. Mechanical linkages result in inefficiencies, in part, because different driver locations in different vehicles require different mechanical linkage dimensions and packaging. Thus, new or different bodies often cannot use “off-the-shelf” components and linkages. Componentry for one vehicle body configuration is typically not compatible for use with other vehicle body configurations. Furthermore, if a manufacturer changes the design of a body, a change in the design of the mechanical linkage and the component to which it is attached may be required. The change in design of the linkages and components requires modifications to the tooling that produces the linkages and components.[0006]
• The location of the connections on prior art vehicle bodies and componentry also results in inefficiencies. In prior art body-on-frame architecture, connection locations on the body are often not exposed to an exterior face of the body, and are distant from corresponding connections on the componentry; therefore, long connectors such as wiring harnesses and cables must be routed throughout the body from componentry. The vehicle body of a fully-assembled prior art vehicle is intertwined with the componentry and the connection devices, rendering separation of the body from its componentry difficult and labor-intensive, if not impossible. The use of long connectors increases the number of assembly steps required to attach a vehicle to its componentry.[0007]
• Furthermore, prior art vehicles typically have internal combustion engines that have a height that is a significant proportion of the overall vehicle height. Prior art vehicle bodies are therefore designed with an engine compartment that occupies about a third of the front (or sometimes the rear) of the body length. Compatibility between an engine and a vehicle body requires that the engine fit within the body's engine compartment without physical part interference. Moreover, compatibility between a prior art chassis with an internal combustion engine and a vehicle body requires that the body have an engine compartment located such that physical part interference is avoided. For example, a vehicle body with an engine compartment in the rear is not compatible with a chassis with an engine in the front.[0008]
SUMMARY OF THE INVENTION
• A self-contained chassis has substantially all of the mechanical, electrical, and structural componentry necessary for a fully functional vehicle, including at least an energy conversion system, a suspension and wheels, a steering system, and a braking system. The chassis has a simplified, and preferably standardized, interface with connection components to which bodies of substantially varying design can be attached. X-by-wire technology is utilized to eliminate mechanical control linkages.[0009]
• As a result, the amount of time and resources required to design and manufacture new vehicle bodies are reduced. Body designs need only conform to the simple attachment interface of the chassis, eliminating the need to redesign or reconfigure expensive components.[0010]
• Further, a multitude of body configurations share a common chassis, enabling economies of scale for major mechanical, electrical, and structural components.[0011]
• Connection components, exposed and unobstructed, increase manufacturing efficiency because attachment of a body to the chassis requires only engagement of the connection components to respective complementary connection components on a vehicle body.[0012]
• Vehicle owners can increase the functionality of their vehicles at a lower cost than possible with the prior art because a vehicle owner need buy only one chassis upon which to mount a multitude of body styles.[0013]
• A method is provided in accordance with the present invention for modifying the functionality and aesthetic characteristics of the vehicle. The method includes the steps of: A) removing a first body from a vehicle chassis, wherein the first body and chassis form a first type of vehicle; and B) attaching a second body to the chassis without subjecting the second body to significant value-added manufacturing processes, wherein the second body and chassis form a second type of vehicle different from the first type of vehicle and having different functionality and aesthetic characteristics.[0014]
• The method may further comprise purchasing, exchanging, disposing of, or storing the first body of the customer. Further, inventory of vehicle bodies which are selectively engageable with the chassis may also be maintained. Preferably, the inventory includes at least two body styles engageable with the chassis which are selected from the group consisting of sedans, pick-up trucks, convertibles, coupes, vans, station wagons, sport-utility vehicles, or other types of transports.[0015]
• The owner of the chassis may be offered a club membership wherein dues are paid for selective access to the vehicle body inventory. The club membership would enable the owner to order, reserve, rent, lease or exchange vehicle bodies on demand. The owner may be an individual end user of the vehicular platform and body, a corporate consumer, an auto rental company, etc.[0016]
• The first body may be returned to the inventory, and possession of the first body may be granted to a third party from the inventory for attachment to another chassis owned by the third party.[0017]
• The first body may be removed and the second body attached at a location convenient to the owner of the chassis, such as in the owner's driveway. Alternatively, the removing and attaching steps may be performed in a specialized body exchange service station.[0018]
• Preferably, the chassis would include a structural frame; a suspension system mounted to the frame, at least three wheels connected to the suspension system; an energy conversion system connected to at least one wheel and controllable by wire; and a by-wire braking system mounted with respect to the frame and operatively connected to at least one wheel.[0019]
• The above object, features, advantages, and other objects, features, and advantages of the present invention are readily apparent from the following detailed description of the best modes for carrying out the invention when taken in connection with the accompanying drawings.[0020]
BRIEF DESCRIPTION OF THE DRAWINGS
• FIG. 1 is a schematic illustration in perspective view of a vehicle rolling platform according to an embodiment of the present invention;[0021]
• FIG. 2 is a top view schematic illustration of the vehicle rolling platform shown in FIG. 1;[0022]
• FIG. 3 is a bottom view schematic illustration of the vehicle rolling platform shown in FIGS. 1 and 2;[0023]
• FIG. 4 is a schematic illustration in side view of a vehicle body pod and rolling platform attachment scenario according to the present invention that is useful with the embodiment of FIGS.[0024]1-3;
• FIG. 5 is a schematic illustration of a vehicle body pod and rolling platform attachment scenario, wherein body pods of differing configurations are each attachable to identical rolling platforms;[0025]
• FIG. 6 is a schematic illustration of a steering system for use with the rolling platform and body pod shown in FIG. 4;[0026]
• FIG. 7 is a schematic illustration of an alternative steering system for use in the rolling platform and body pod of FIG. 4;[0027]
• FIG. 8 is a schematic illustration of a braking system for use with the rolling platform and body pod of FIG. 4;[0028]
• FIG. 9 is a schematic illustration of an alternative braking system for use with the rolling platform and body pod of FIG. 4;[0029]
• FIG. 10 is a schematic illustration of an energy conversion system for use with the rolling platform and body pod of FIG. 4;[0030]
• FIG. 11 is a schematic illustration of an alternative energy conversion system for use with the rolling platform and body pod of FIG. 4;[0031]
• FIG. 12 is a schematic illustration of a suspension system for use with the rolling platform of FIGS.[0032]1-5;
• FIG. 13 is a schematic illustration of an alternative suspension system for use with the rolling platform and body pod of FIG. 4;[0033]
• FIG. 14 is a schematic illustration of a chassis computer and chassis sensors for use with the rolling platform and body pod of FIG. 4;[0034]
• FIG. 15 is a schematic illustration of a master control unit with a suspension system, braking system, steering system, and energy conversion system for use with the rolling platform and body pod of FIG. 4;[0035]
• FIG. 16 is a perspective illustration of a skinned rolling platform according to a further embodiment of the present invention;[0036]
• FIG. 17 is a perspective illustration of a skinned rolling platform according to another embodiment of the present invention;[0037]
• FIG. 18 is a side schematic illustration of a rolling platform with an energy conversion system including an internal combustion engine, and gasoline tanks;[0038]
• FIG. 19 is a side schematic illustration of a rolling platform according to another embodiment of the invention, with a mechanical steering linkage and passenger seating attachment couplings;[0039]
• FIGS. 20 and 20[0040]ashow partial exploded perspective schematic illustrations of a rolling platform according to a further embodiment of the invention in an attachment scenario with a body pod, the rolling platform having multiple electrical connectors engageable with complementary electrical connectors in the body pod;
• FIG. 21 is a perspective schematic illustration of a skinned rolling platform according to yet another embodiment of the invention, the rolling platform having a movable control input device;[0041]
• FIG. 22 is an illustration of a body selection grouping showing perspective views of vehicles according to various aspects of the present invention;[0042]
• FIG. 23 is a process diagram illustrating a body inventory and a chassis with a removable body in accordance with the invention;[0043]
• FIG. 24 is a process diagram illustrating body and chassis manufacturing operations;[0044]
• FIG. 25 is a flow chart illustrating interchangeability of vehicle bodies with a single chassis over an extended period of time, and including software and hardware upgrades;[0045]
• FIG. 26 is a schematic illustration of a business process in accordance with the invention; and[0046]
• FIG. 27 is a schematic illustration of a further business process in accordance with the invention.[0047]
DESCRIPTION OF THE PREFERRED EMBODIMENTS
• Referring to FIG. 1, a[0048]vehicle chassis10 in accordance with the invention, also referred to as the “rolling platform,” includes astructural frame11. Thestructural frame11 depicted in FIG. 1 comprises a series of interconnected structural elements including upper and lower sidestructural elements12 and14 that comprise a “sandwich”-like construction.Elements12 and14 are substantially rigid tubular (or optionally solid), members that extend longitudinally between the front andrear axle areas16,18, and are positioned outboard relative tosimilar elements20,22. The front and rear ends ofelements12,14 are angled inboard, extending towardelements20 and22 and connecting therewith prior to entering theaxle areas16,18. For added strength and rigidity a number of vertical and angled structural elements extend betweenelements12,14,20 and22. Similar to theelements12,14,20 and22, which extend along the left side of the rollingplatform10, a family ofstructural elements26,28,30 and32 extend along the right side thereof.
• Lateral[0049]structural elements34,36 extend betweenelements20,30 and22,32, respectively nearer thefront axle area16 and lateralstructural elements38,40 extend betweenelements20,30 and22,32, respectively nearer therear axle area18, thereby defining amid-chassis space41. Thefront axle area16 is defined in and aroundstructural elements43,44 at the rear and front, and on the sides bystructural elements46,48 which may be extensions of theelements20,22,30,32 or connected therewith. Forward of the front axle area, a forward space is defined betweenelement44 andelements50,52. Therear axle area18 is defined in and aroundstructural elements53,54 at the front and rear, and on the sides bystructural elements56,58, which may be extensions of theelements20,22,30,32 or connected therewith. Rearward of therear axle area18, a rearward space is defined betweenelement54 andelements60,62. Alternatively, therear axle area18 or the rearward space may be elevated relative to the rest of thestructural frame11 if necessary to accommodate an energy conversion system, and the frame may include other elements to surround and protect an energy conversion system. The frame defines a plurality of open spaces between the elements described above. Those skilled in the art will recognize materials and fastening methods suitable for use in the structural frame. For example, the structural elements may be tubular, aluminum, and welded at their respective connections to other structural elements.
• The[0050]structural frame11 provides a rigid structure to which anenergy conversion system67,energy storage system69,suspension system71 withwheels73,75,77,79 (each wheel having a tire80),steering system81, andbraking system83 are mounted, as shown in FIGS.1-3, and is configured to support an attachedbody85, as shown in FIG. 4. A person of ordinary skill in the art will recognize that thestructural frame11 can take many different forms, in addition to the cage-like structure of the embodiment depicted in FIGS.1-3. For example, thestructural frame11 can be a traditional automotive frame having two or more longitudinal structural members spaced a distance apart from each other, with two or more transverse structural members spaced apart from each other and attached to both longitudinal structural members at their ends. Alternatively, the structural frame may also be in the form of a “belly pan,” wherein integrated rails and cross members are formed in sheets of metal or other suitable material, with other formations to accommodate various system components. The structural frame may also be integrated with various chassis components.
• Referring to FIG. 2, a[0051]body attachment interface87 is defined as the sum of all body connection components, i.e., connective elements that function to operably mate a vehicle body to thechassis10. The body connection components of the preferred embodiment include a plurality of load-bearing body-retention couplings89 mounted with respect to thestructural frame11 and a singleelectrical connector91.
• As shown in FIG. 4, the load-bearing body-[0052]retention couplings89 are engageable withcomplementary attachment couplings93 on avehicle body85 and function to physically fasten thevehicle body85 to thechassis10. Those skilled in the art will recognize that a multitude of fastening and locking elements may be used and fall within the scope of the claimed invention. The load-bearing body-retention couplings89 are preferably releasably engageable with complementary couplings, though non-releasably engageable couplings such as weld flanges or riveting surfaces may be employed within the scope of the claimed invention. Ancillary fastening elements may be used as lock downs in conjunction with the load-bearing body-retention couplings. Load-bearing surfaces without locking or fastening features on thechassis10 may be used with the load-bearing body-retention couplings89 to support the weight of an attachedvehicle body85. In the preferred embodiment, the load-bearing body-retention couplings89 include support brackets with bolt holes. Rubber mounts (not shown) located on the support brackets dampen vibrations transmitted between the body and the chassis. Alternatively, hard mounts may be employed for body-retention couplings.
• The[0053]electrical connector91 is engageable with a complementaryelectrical connector95 on avehicle body85. Theelectrical connector91 of the preferred embodiment may perform multiple functions, or select combinations thereof. First, theelectrical connector91 may function as an electrical power connector, i.e., it may be configured to transfer electrical energy generated by components on thechassis10 to avehicle body85 or other non-chassis destination. Second, theelectrical connector91 may function as a control signal receiver, i.e., a device configured to transfer control signals from a non-chassis source to controlled systems including the energy conversion system, steering system, and braking system. Third, theelectrical connector91 may function as a feedback signal conduit through which feedback signals are made available to a vehicle driver. Fourth, theelectrical connector91 may function as an external programming interface through which software containing algorithms and data may be transmitted for use by controlled systems. Fifth, the electrical connector may function as an information conduit through which sensor information and other information is made available to a vehicle driver. Theelectrical connector91 may thus function as a communications and power “umbilical” port through which all communications between thechassis10 and an attachedvehicle body85 are transmitted. Electrical connectors include devices configured to operably connect one or more electrical wires with other electrical wires. The wires may be spaced a distance apart to avoid any one wire causing signal interference in another wire operably connected to an electrical connector or for any reason that wires in close proximity may not be desirable.
• If one electrical connector performing multiple functions is not desirable, for example, if a cumbersome wire bundle is required, or power transmission results in control signal interference, the[0054]body attachment interface87 may include a plurality ofelectrical connectors91 engageable with a plurality of complementaryelectrical connectors95 on avehicle body85, with different connectors performing different functions. A complementaryelectrical connector95 performs functions complementary to the function of the electrical connector with which it engages, for example, functioning as a control signal transmitter when engaged with a control signal receiver.
• Referring again to FIGS.[0055]1-3, theenergy conversion system67,energy storage system69,steering system81, andbraking system83, are configured and positioned on thechassis10 to minimize the overall vertical height of thechassis10 and to maintain a substantially horizontalupper chassis face96. A face of an object is an imaginary surface that follows the contours of the object that face, and are directly exposed to, a particular direction. Thus, theupper chassis face96 is an imaginary surface that follows the upwardly facing and exposed contours of thechassis frame11 and systems mounted therein. Matable vehicle bodies have a corresponding lower body face97 that is an imaginary surface that follows the downwardly facing and exposed contours of thebody85, as shown in FIG. 4.
• Referring again to FIGS.[0056]1-3, thestructural frame11 has a height defined as the vertical distance between its highest point (the top of structural element20) and its lowest point (the bottom of structural element22). In the preferred embodiment, the structural frame height is approximately 11 inches. To achieve a substantially horizontalupper chassis face96, theenergy conversion system67,energy storage system69,steering system81, andbraking system83 are distributed throughout the open spaces and are configured, positioned, and mounted to thestructural frame11 such that no part of theenergy conversion system67,energy storage system69,steering system81, orbraking system83, extends or protrudes above thestructural frame11 more than 50% of the structural frame's11 height, or above the top of any of thetires80. The substantially horizontalupper chassis face96 enables the attachedvehicle body85 to have a passenger area that extends the length of the chassis, unlike prior art bodies that have an engine compartment to accommodate a vertically-protruding internal combustion engine.
• Most of the powertrain load is evenly distributed between the front and rear of the chassis so there is a lower center of gravity for the whole vehicle without sacrificing ground clearance, thereby enabling improved handling while resisting rollover forces.[0057]
• Referring again to FIG. 4, the preferred embodiment of the rolling[0058]platform10 is configured such that the lower body face97 of amatable vehicle body85 is positioned closely adjacent to theupper chassis face96 for engagement with the rollingplatform10. The body connection components have a predetermined spatial relationship relative to one another, and are sufficiently positioned, exposed, and unobstructed such that when avehicle body85 having complementary connection components (complementary attachment couplings93 and a complementary electrical connector95) in the same predetermined spatial relationship as the body connection components is sufficiently positioned relative to theupper chassis face96 of achassis10 of the invention, the complementary connection components are adjacent to corresponding body connection components and ready for engagement, as depicted in FIG. 4. In the context of the present invention, a body connection component having a protective covering is exposed and unobstructed if the protective covering is removable or retractable.
• Each body connection component has a spatial relationship relative to each of the other body connection components that can be expressed, for example, as a vector quantity. Body connection components and complementary connection components have the same predetermined spatial relationship if the vector quantities that describe the spatial relationship between a body connection component and the other body connection components to be engaged also describe the spatial relationship between a corresponding complementary connection component and the other complementary connection components to be engaged. For example, the spatial relationship may be defined as follows: a first body connection component is spaced a distance Ax+By from a reference point; a second body connection component is spaced a distance Cx+Dy from the reference point; a third body connection component is spaced a distance Ex+Fy from the reference point; etc. Corresponding complementary connection components in the same predetermined spatial relationship are spaced in a mirror image relationship in the lower body face, as depicted in FIGS. 4 and 5. A protective covering (not shown) may be employed to protect any of the body connection components.[0059]
• The body connection components and the complementary connection components are preferably adjacent without positional modification when a[0060]vehicle body85 is sufficiently positioned relative to achassis10 of the invention; however, in the context of the present invention, the body connection components may be movable relative to each other within a predetermined spatial relationship to accommodate build tolerances or other assembly issues. For example, an electrical connector may be positioned and operably connected to a signal-carrying cable. The cable may be fixed relative to the structural frame at a point six inches from the electrical connector. The electrical connector will thus be movable within six inches of the fixed point on the cable. A body connection component is considered adjacent to a complementary connection component if one or both are movable within a predetermined spatial relationship so as to be in contact with each other.
• Referring to FIG. 5, the body-attachment interface of the claimed invention enables compatibility between the[0061]chassis10 and different types ofbodies85,85′,85″ having substantially different designs.Bodies85,85′,85″ having acommon base98 withcomplementary attachment couplings93 and complementaryelectrical connectors95 in the same predetermined spatial relationship with one another as the predetermined spatial relationship between body connection components on the body-attachment interface87, are each matable with thechassis10 by positioning thebody85,85′,85″ relative to thechassis10 such that eachcomplementary attachment coupling93 is adjacent to a load-bearing body-retention coupling89, and the complementaryelectrical connector95 is adjacent to theelectrical connector91. In accordance with the preferred embodiment of the present invention, all bodies and chassis comply with this common, standardized interface system, thereby enabling a wide array of different body types and styles to be attached to a single chassis design. The substantially horizontalupper chassis face96 also facilitates compatibility between the rollingplatform10 and a multitude of differently-configured body styles. Thecommon base98 functions as a body structural unit and forms the lower body face97 in the preferred embodiment. FIG. 5 schematically depicts asedan85, avan85′, and apickup truck85″ each having acommon base98.
• The body connection components are preferably sufficiently exposed at a chassis face to facilitate attachment to complementary connection components on a matable vehicle body. Similarly, complementary connection components on a matable vehicle body are sufficiently exposed at a body face to facilitate attachment to body connection components on a vehicle chassis. In the preferred embodiment of the invention, the body connection components are located at or above the upper chassis face for engagement with complementary connection components located at or below a lower body face.[0062]
• It is within the scope of the claimed invention to employ a connection device to engage or operably connect a body connection component with a distant complementary connection component, in the situation where a vehicle body does not have complementary connection components in the same predetermined spatial relationship as the body connection components on a vehicle chassis. For example, a cable having two connectors, one connector engageable with the electrical connector on a body attachment interface and the other connector engageable with a complementary connector on a matable vehicle body, may be used to operably connect the electrical connector and the complementary connector.[0063]
• The[0064]bodies85,85′,85″ shown schematically in FIG. 5 each use all of the body connection components on thevehicle chassis10. However, within the scope of the claimed invention, a chassis may have more body connection components than are actually mated with a vehicle body. For example, a chassis may have ten load-bearing body-retention couplings, and be matable with a body that engages only five of the ten load-bearing body-retention couplings. Such an arrangement is particularly useful when an attachable body is of a different size than the chassis. For example, a matable body may be smaller than a chassis. Similarly, and within the scope of the claimed invention, a body may be modular such that separate body components are independently connected to the vehicle chassis by the load-bearing body-retention couplings.
• A body may have more complementary connection components than are engageable with the body connection components of a particular chassis. Such an arrangement may be employed to enable a particular body to be matable to multiple chassis each having a different predetermined spatial relationship among its body connection components.[0065]
• The load-bearing body-[0066]retention couplings89 and theelectrical connector91 are preferably releasably engageable without damage to either an attachedbody85 or thechassis10, thereby enabling removal of onebody85 from thechassis10 and installation of adifferent body85′,85″ on thechassis10.
• In the preferred embodiment, the body-[0067]attachment interface87 is characterized by the absence of any mechanical control signal-transmission linkages and any couplings for attaching mechanical control signal-transmission linkages. Mechanical control linkages, such as steering columns, limit the compatibility between a chassis and bodies of different configurations.
• Referring to FIG. 1, the[0068]steering system81 is housed in thefront axle area16 and is operably connected to thefront wheels73,75. Preferably, thesteering system81 is responsive to non-mechanical control signals. In the preferred embodiment, thesteering system81 is by-wire. A by-wire system is characterized by control signal transmission in electrical form. In the context of the present invention, “by-wire” systems, or systems that are controllable “by-wire,” include systems configured to receive control signals in electronic form via a control signal receiver on thebody attachment interface87, and respond in conformity to the electronic control signals.
• Referring to FIG. 6, the by-[0069]wire steering system81 of the preferred embodiment includes asteering control unit98, and asteering actuator99.Sensors100 are located on thechassis10 and transmitsensor signals101 carrying information concerning the state or condition of thechassis10 and its component systems. Thesensors100 may include position sensors, velocity sensors, acceleration sensors, pressure sensors, force and torque sensors, flow meters, temperature sensors, etc. Thesteering control unit98 receives and processes sensor signals101 from thesensors100 and electrical steering control signals102 from theelectrical connector91, and generates steering actuator control signals103 according to a stored algorithm. A control unit typically includes a microprocessor, ROM and RAM and appropriate input and output circuits of a known type for receiving the various input signals and for outputting the various control commands to the actuators. Sensor signals101 may include yaw rate, lateral acceleration, angular wheel velocity, tie-rod force, steering angle, chassis velocity, etc.
• The[0070]steering actuator99 is operably connected to thefront wheels73,75 and configured to adjust the steering angle of thefront wheels73,75 in response to the steering actuator control signals103. Actuators in a by-wire system transform electronic control signals into a mechanical action or otherwise influence a system's behavior in response to the electronic control signals. Examples of actuators that may be used in a by-wire system include electromechanical actuators such as electric servomotors, translational and rotational solenoids, magnetorheological actuators, electrohydraulic actuators, and electrorheological actuators. Those skilled in the art will recognize and understand mechanisms by which the steering angle is adjusted. In the preferred embodiment, the steeringactuator99 is an electric drive motor configured to adjust a mechanical steering rack.
• Referring again to FIG. 6, the preferred embodiment of the[0071]chassis10 is configured such that it is steerable by any source of compatible electrical steering control signals102 connected to theelectrical connector91. FIG. 6 depicts asteering transducer104 located on an attachedvehicle body85 and connected to a complementaryelectrical connector95. Transducers convert the mechanical control signals of a vehicle driver to non-mechanical control signals. When used with a by-wire system, transducers convert the mechanical control signals to electrical control signals usable by the by-wire system. A vehicle driver inputs control signals in mechanical form by turning a wheel, depressing a pedal, pressing a button, or the like. Transducers utilize sensors, typically position and force sensors, to convert the mechanical input to an electrical signal. In the preferred embodiment, a +/−20 degree slide mechanism is used for driver input, and an optical encoder is used to read input rotation.
• The complementary[0072]electrical connector95 is coupled with theelectrical connector91 of thebody attachment interface87. Thesteering transducer104 converts vehicle driver-initiated mechanical steering control signals105 to electrical steering control signals102 which are transmitted via theelectrical connector91 to thesteering control unit98. In the preferred embodiment, thesteering control unit98 generates steering feedback signals106 for use by a vehicle driver and transmits the steering feedback signals106 through theelectrical connector91. Some of thesensors100 monitor linear distance movement of the steering rack and vehicle speed. This information is processed by thesteering control unit98 according to a stored algorithm to generate the steering feedback signals106. A torque control motor operably connected to the slide mechanism receives the steering feedback signals106 and is driven in the opposite direction of the driver's mechanical input.
• In the context of the present invention, a “by-wire” system may be an actuator connected directly to an electrical connector in the body attachment interface. An alternative by-[0073]wire steering system81′ within the scope of the claimed invention is depicted schematically in FIG. 7, wherein like reference numbers refer to like components from FIG. 6. A steeringactuator99 configured to adjust the steering angle of thefront wheels73,75 is connected directly to theelectrical connector91. In this embodiment, asteering control unit98′ and asteering transducer104 may be located in an attachedvehicle body85. Thesteering transducer104 would transmit electrical steering control signals102 to thesteering control unit98′, and thesteering control unit98′ would transmit steering actuator control signals103 to thesteering actuator99 via theelectrical connector91.Sensors100 positioned on thechassis10 transmitsensor signals101 to thesteering control unit98′ via theelectrical connector91 and the complementaryelectrical connector95.
• Examples of steer-by-wire systems are described in U.S. Pat. No. 6,176,341, issued Jan. 23, 2001 to Delphi Technologies, Inc; U.S. Pat. No. 6,208,923, issued Mar. 27, 2001 to Robert Bosch GmbH; U.S. Pat. No. 6,219,604, issued Apr. 17, 2001 to Robert Bosch GmbH; U.S. Pat. No. 6,318,494, issued Nov. 20, 2001 to Delphi Technologies, Inc.; U.S. Pat. No. 6,370,460, issued Apr. 9, 2002 to Delphi Technologies, Inc.; and U.S. Pat. No. 6,394,218, issued May 28, 2002 to TRW Fahrwerksysteme GmbH & Co. KG; which are hereby incorporated by reference in their entireties.[0074]
• The steer-by-wire system described in U.S. Pat. No. 6,176,341 includes a position sensor for sensing angular position of a road wheel, a hand-operated steering wheel for controlling direction of the road wheel, a steering wheel sensor for sensing position of the steering wheel, a steering wheel actuator for actuating the hand-operated steering wheel, and a steering control unit for receiving the sensed steering wheel position and the sensed road wheel position and calculating actuator control signals, preferably including a road wheel actuator control signal and a steering wheel actuator control signal, as a function of the difference between the sensed road wheel position and the steering wheel position. The steering control unit commands the road wheel actuator to provide controlled steering of the road wheel in response to the road wheel actuator control signal. The steering control unit further commands the steering wheel actuator to provide feedback force actuation to the hand-operated steering wheel in response to the steering wheel control signal. The road wheel actuator control signal and steering wheel actuator control signal are preferably scaled to compensate for difference in gear ratio between the steering wheel and the road wheel. In addition, the road wheel actuator control signal and steering wheel actuator control signal may each have a gain set so that the road wheel control actuator signal commands greater force actuation to the road wheel than the feedback force applied to the steering wheel.[0075]
• The steer-by-wire system described in U.S. Pat. No. 6,176,341 preferably implements two position control loops, one for the road wheel and one for the hand wheel. The position feedback from the steering wheel becomes a position command input for the road wheel control loop and the position feedback from the road wheel becomes a position command input for the steering wheel control loop. A road wheel error signal is calculated as the difference between the road wheel command input (steering wheel position feedback) and the road wheel position. Actuation of the road wheel is commanded in response to the road wheel error signal to provide controlled steering of the road wheel. A steering wheel error signal is calculated as the difference between the steering wheel position command (road wheel position feedback) and the steering wheel position. The hand-operated steering wheel is actuated in response to the steering wheel error signal to provide force feedback to the hand-operated steering wheel.[0076]
• The steering control unit of the '341 system could be configured as a single processor or multiple processors and may include a general-purpose microprocessor-based controller, that may include a commercially available off-the-shelf controller. One example of a controller is Model No. 87C196CA microcontroller manufactured and made available from Intel Corporation of Delaware. The steering control unit preferably includes a processor and memory for storing and processing software algorithms, has a clock speed of 16 MHz, two optical encoder interfaces to read position feedbacks from each of the actuator motors, a pulse width modulation output for each motor driver, and a 5-volt regulator.[0077]
• U.S. Pat. No. 6,370,460 describes a steer-by-wire control system comprising a road wheel unit and a steering wheel unit that operate together to provide steering control for the vehicle operator. A steering control unit may be employed to support performing the desired signal processing. Signals from sensors in the road wheel unit, steering wheel unit, and vehicle speed are used to calculate road wheel actuator control signals to control the direction of the vehicle and steering wheel torque commands to provide tactile feedback to the vehicle operator. An Ackerman correction may be employed to adjust the left and right road wheel angles correcting for errors in the steering geometry to ensure that the wheels will track about a common turn center.[0078]
• Referring again to FIG. 1, a[0079]braking system83 is mounted to thestructural frame11 and is operably connected to thewheels73,75,77,79. The braking system is configured to be responsive to non-mechanical control signals. In the preferred embodiment, thebraking system83 is by-wire, as depicted schematically in FIG. 8, wherein like reference numbers refer to like components from FIGS. 6 and 7.Sensors100 transmitsensor signals101 carrying information concerning the state or condition of thechassis10 and its component systems to abraking control unit107. Thebraking control unit107 is connected to theelectrical connector91 and is configured to receive electrical braking control signals108 via theelectrical connector91. Thebraking control unit107 processes the sensor signals101 and the electrical braking control signals108 and generates braking actuator control signals109 according to a stored algorithm. Thebraking control unit107 then transmits the braking actuator control signals109 tobraking actuators110,111,112,113 which act to reduce the angular velocity of thewheels73,75,77,79. Those skilled in the art will recognize the manner in which thebraking actuators110,111,112,113 act on thewheels73,75,77,79. Typically, actuators cause contact between friction elements, such as pads and disc rotors. Optionally, an electric motor may function as a braking actuator in a regenerative braking system.
• The[0080]braking control unit107 may also generate braking feedback signals114 for use by a vehicle driver and transmit the braking feedback signals114 through theelectrical connector91. In the preferred embodiment, thebraking actuators110,111,112,113 apply force through a caliper to a rotor at each wheel. Some of thesensors100 measure the applied force on each caliper. Thebraking control unit107 uses this information to ensure synchronous force application to each rotor.
• Referring again to FIG. 8, the preferred embodiment of the[0081]chassis10 is configured such that the braking system is responsive to any source of compatible electrical braking control signals108. Abraking transducer115 may be located on an attachedvehicle body85 and connected to a complementaryelectrical connector95 coupled with theelectrical connector91. Thebraking transducer115 converts vehicle driver-initiated mechanical braking control signals116 into electrical form and transmits the electrical braking control signals106 to the braking control unit via theelectrical connector91. In the preferred embodiment, thebraking transducer115 includes two hand-grip type assemblies. Thebraking transducer115 includes sensors that measure both the rate of applied pressure and the amount of applied pressure to the hand-grip assemblies, thereby converting mechanical braking control signals116 to electrical braking control signals108. Thebraking control unit107 processes both the rate and amount of applied pressure to provide both normal and panic stopping.
• An alternative brake-by-[0082]wire system83′ within the scope of the claimed invention is depicted in FIG. 9, wherein like reference numbers refer to like components from FIGS.6-8. Thebraking actuators110,111,112,113 andsensors100 are connected directly to theelectrical connector91. In this embodiment, abraking control unit107′ may be located in an attachedvehicle body85. Abraking transducer115 transmits electrical braking control signals108 to thebraking control unit107′, and thebraking control unit107′ transmits braking actuator signals109 to thebraking actuators110,111,112,113 via theelectrical connector91.
• Examples of brake-by-wire systems are described in U.S. Pat. No. 5,366,281, issued Nov. 22, 2994 to General Motors Corporation; U.S. Pat. No. 5,823,636, issued Oct. 20, 1998 to General Motors Corporation; U.S. Pat. No. 6,305,758, issued Oct. 23, 2001 to Delphi Technologies, Inc.; and U.S. Pat. No. 6,390,565, issued May 21, 2002 to Delphi Technologies, Inc.; which are hereby incorporated by reference in their entireties.[0083]
• The system described in U.S. Pat. No. 5,366,281 includes an input device for receiving mechanical braking control signals, a brake actuator and a control unit coupled to the input device and the brake actuator. The control unit receives brake commands, or electrical braking control signals, from the input device and provides actuator commands, or braking actuator control signals, to control current and voltage to the brake actuator. When a brake command is first received from the input device, the control unit outputs, for a first predetermined time period, a brake torque command to the brake actuator commanding maximum current to the actuator. After the first predetermined time period, the control unit outputs, for a second predetermined time period, a brake torque command to the brake actuator commanding voltage to the actuator responsive to the brake command and a first gain factor. After the second predetermined time period, the control unit outputs the brake torque command to the brake actuator commanding current to the actuator responsive to the brake command and a second gain factor, wherein the first gain factor is greater than the second gain factor and wherein brake initialization is responsive to the brake input.[0084]
• U.S. Pat. No. 6,390,565 describes a brake-by-wire system that provides the capability of both travel and force sensors in a braking transducer connected to a brake apply input member such as a brake pedal and also provides redundancy in sensors by providing the signal from a sensor responsive to travel or position of the brake apply input member to a first control unit and the signal from a sensor responsive to force applied to a brake apply input member to a second control unit. The first and second control units are connected by a bi-directional communication link whereby each controller may communicate its received one of the sensor signals to the other control unit. In at least one of the control units, linearized versions of the signals are combined for the generation of first and second brake apply command signals for communication to braking actuators. If either control unit does not receive one of the sensor signals from the other, it nevertheless generates its braking actuator control signal on the basis of the sensor signal provided directly to it. In a preferred embodiment of the system, a control unit combines the linearized signals by choosing the largest in magnitude.[0085]
• Referring again to FIG. 1, the[0086]energy storage system69 stores energy that is used to propel thechassis10. For most applications, the stored energy will be in chemical form. Examples ofenergy storage systems69 include fuel tanks and electric batteries. In the embodiment shown in FIG. 1, theenergy storage system69 includes two compressed gas cylinder storage tanks121 (5,000 psi, or 350 bars) mounted within themid-chassis space41 and configured to store compressed hydrogen gas. Employing more than two compressed gas cylinder storage tanks may be desirable to provide greater hydrogen storage capacity. Instead of compressed gascylinder storage tanks121, an alternate form of hydrogen storage may be employed such as metal or chemical hydrides. Hydrogen generation or reforming may also be used.
• The[0087]energy conversion system67 converts the energy stored by theenergy storage system69 to mechanical energy that propels thechassis10. In the preferred embodiment, depicted in FIG. 1, theenergy conversion system67 includes afuel cell stack125 located in therear axle area18, and anelectric traction motor127 located in thefront axle area16. Thefuel cell stack125 produces a continuously available power of 94 kilowatts. Fuel cell systems for vehicular use are described in U.S. Pat. No. 6,195,999, issued Mar. 6, 2001 to General Motors Corporation; U.S. Pat. No. 6,223,843, issued May 1, 2001 to General Motors Corporation; U.S. Pat. No. 6,321,145, issued Nov. 20, 2001 to Delphi Technologies, Inc.; and U.S. Pat. No. 6,394,207, issued May 28, 2002 to General Motors Corporation; which are hereby incorporated by reference in their entireties.
• The[0088]fuel cell stack125 is operably connected to the compressed gascylinder storage tanks121 and to thetraction motor127. Thefuel cell stack125 converts chemical energy in the form of hydrogen from the compressed gascylinder storage tanks121 into electrical energy, and thetraction motor127 converts the electrical energy to mechanical energy, and applies the mechanical energy to rotate thefront wheels73,75. Optionally, thefuel cell stack125 andtraction motor127 are switched between thefront axle area16 andrear axle area18. Optionally, the energy conversion system includes an electric battery (not shown) in hybrid combination with the fuel cell to improve chassis acceleration. Other areas provided between the structural elements are useful for housing other mechanisms and systems for providing the functions typical of an automobile as shown in FIGS. 2 and 3. Those skilled in the art will recognize otherenergy conversion systems67 that may be employed within the scope of the present invention.
• The[0089]energy conversion system67 is configured to respond to non-mechanical control signals. Theenergy conversion system67 of the preferred embodiment is controllable by-wire, as depicted in FIG. 10. An energy conversionsystem control unit128 is connected to theelectrical connector91 from which it receives electrical energy conversion system control signals129, andsensors100 from which it receives sensor signals101 carrying information about various chassis conditions. In the preferred embodiment, the information conveyed by the sensor signals101 to the energy conversionsystem control unit128 includes chassis velocity, electrical current applied, rate of acceleration of the chassis, and motor shaft speed to ensure smooth launches and controlled acceleration. The energy conversionsystem control unit128 is connected to an energyconversion system actuator130, and transmits energy conversion system actuator control signals131 to the energyconversion system actuator130 in response to the electrical energy conversion system control signals129 andsensor signals101 according to a stored algorithm. The energy conversion system actuator130 acts on thefuel cell stack125 ortraction motor127 to adjust energy output. Those skilled in the art will recognize the various methods by which the energyconversion system actuator130 may adjust the energy output of the energy conversion system. For example, a solenoid may alternately open and close a valve that regulates hydrogen flow to the fuel cell stack. Similarly, a compressor that supplies oxygen (from air) to the fuel cell stack may function as an actuator, varying the amount of oxygen supplied to the fuel cell stack in response to signals from the energy conversion system control unit.
• An energy[0090]conversion system transducer132 may be located on avehicle body85 and connected to a complementaryelectrical connector95 engaged with theelectrical connector91. The energyconversion system transducer132 is configured to convert mechanical energy conversion system control signals133 to electrical energy conversion system control signals129.
• In another embodiment of the invention, as shown schematically in FIG. 11, wherein like reference numbers refer to like components from FIGS.[0091]6-10,wheel motors135, also known as wheel hub motors, are positioned at each of the fourwheels73,75,77,79. Optionally,wheel motors135 may be provided at only thefront wheels73,75 or only therear wheels77,79. The use ofwheel motors135 reduces the height of thechassis10 compared to the use of traction motors, and therefore may be desirable for certain uses.
• Referring again to FIG. 2, a[0092]conventional heat exchanger137 andelectric fan system139, operably connected to thefuel cell stack125 to circulate coolant for waste heat rejection, is carried in an opening that exists between therear axle area18 and thestructural elements54,60. Theheat exchanger137 is set at an inclined angle to reduce its vertical profile, but to provide adequate heat rejection it also extends slightly above the top ofelements12,26 (as seen in FIG. 4). Although thefuel cell stack125,heat exchanger137 andelectric fan system139 extend above the structural elements, their protrusion into the body pod space is relatively minor when compared to the engine compartment requirements of a conventionally designed automobile, especially when the chassis height of the preferred embodiment is approximately a mere 15 inches (28 centimeters). Optionally, theheat exchanger137 is packaged completely within the chassis' structure with airflow routed through channels (not shown).
• Referring again to FIG. 1, the[0093]suspension system71 is mounted to thestructural frame11 and is connected to fourwheels73,75,77,79. Those skilled in the art will understand the operation of a suspension system, and recognize that a multitude of suspension system types may be used within the scope of the claimed invention. Thesuspension system71 of the preferred embodiment of the invention is electronically controlled, as depicted schematically in FIG. 12.
• Referring to FIG. 12, the behavior of the electronically controlled[0094]suspension system71 in response to any given road input is determined by asuspension control unit141.Sensors100 located on thechassis10 monitor various conditions such as vehicle speed, angular wheel velocity, and wheel position relative to thechassis10. Thesensors100 transmit the sensor signals101 to thesuspension control unit141. Thesuspension control unit141 processes the sensor signals101 and generates suspension actuator control signals142 according to a stored algorithm. Thesuspension control unit141 transmits the suspension actuator control signals142 to foursuspension actuators143,144,145,146. Eachsuspension actuator143,144,145,146 is operably connected to awheel73,75,77,79 and determines, in whole or in part, the position of thewheel73,75,77,79 relative to thechassis10. The suspension actuators of the preferred embodiment are variable-force, real time, controllable dampers. Thesuspension system71 of the preferred embodiment is also configured such that chassis ride height is adjustable. Separate actuators may be used to vary the chassis ride height.
• In the preferred embodiment, the[0095]suspension control unit141 is programmable and connected to theelectrical connector91 of the body-attachment interface87. A vehicle user is thus able to altersuspension system71 characteristics by reprogramming thesuspension control unit141 withsuspension system software147 via theelectrical connector91.
• In the context of the claimed invention, electronically-controlled suspension systems include suspension systems without a suspension control unit located on the[0096]chassis10. Referring to FIG. 13, wherein like reference numbers are used to reference like components from FIG. 12,suspension actuators143,144,145,146 andsuspension sensors100 are connected directly to theelectrical connector91. In such an embodiment, asuspension control unit141′ located on an attachedvehicle body85 can process sensor signals101 transmitted through theelectrical connector91, and transmit suspension actuator control signals142 to thesuspension actuators143,144,145,146 via theelectrical connector91.
• Examples of electronically controlled suspension systems are described in U.S. Pat. No. 5,606,503, issued Feb. 25, 1997 to General Motors Corporation; U.S. Pat. No. 5,609,353, issued Mar. 11, 1997 to Ford Motor Company; and U.S. Pat. No. 6,397,134, issued May 28, 2002 to Delphi Technologies, Inc.; which are hereby incorporated by reference in their entireties.[0097]
• U.S. Pat. No. 6,397,134 describes an electronically controlled suspension system that provides improved suspension control through steering crossover events. In particular, the system senses a vehicle lateral acceleration and a vehicle steering angle and stores, for each direction of sensed vehicle lateral acceleration, first and second sets of enhanced suspension actuator control signals for the suspension actuators of the vehicle. Responsive to the sensed vehicle lateral acceleration and sensed vehicle steering angle, the system applies the first set of enhanced actuator control signals to the suspension actuators if the sensed steering angle is in the same direction as the sensed lateral acceleration and alternatively applies the second set of enhanced actuator control signals to the suspension actuators if the sensed steering angle is in the opposite direction as the sensed lateral acceleration.[0098]
• U.S. Pat. No. 5,606,503 describes a suspension control system for use in a vehicle including a suspended vehicle body, four unsuspended vehicle wheels, four variable force actuators mounted between the vehicle body and wheels, one of the variable force actuators at each corner of the vehicle, and a set of sensors providing sensor signals indicative of motion of the vehicle body, motion of the vehicle wheels, a vehicle speed and an ambient temperature. The suspension control system comprises a microcomputer control unit including: means for receiving the sensor signals; means, responsive to the sensor signals, for determining an actuator demand force for each actuator; means, responsive to the vehicle speed, for determining a first signal indicative of a first command maximum; means, responsive to the ambient temperature, for determining a second signal indicative of a second command maximum; and means for constraining the actuator demand force so that it is no greater than a lesser of the first and second command maximums.[0099]
• Electrically conductive wires (not shown) are used in the preferred embodiment to transfer signals between the[0100]chassis10 and an attachedbody85, and between transducers, control units, and actuators. Those skilled in the art will recognize that other non-mechanical means of sending and receiving signals between a body and a chassis, and between transducers, control units, and actuators may be employed and fall within the scope of the claimed invention. Other non-mechanical means of sending and receiving signals include radio waves and fiber optics.
• The by-wire systems are networked in the preferred embodiment, in part to reduce the quantity of dedicated wires connected to the[0101]electrical connector91. A serial communication network is described in U.S. Pat. No. 5,534,848, issued Jul. 9, 1996 to General Motors Corporation, which is hereby incorporated by reference in its entirety. An example of a networked drive-by-wire system is described in U.S. patent application Publication No. US 2001/0029408, Ser. No. 09/775,143, which is hereby incorporated by reference in its entirety. Those skilled in the art will recognize various networking devices and protocols that may be used within the scope of the claimed invention, such as SAE J1850 and CAN (“Controller Area Network”). A TTP (“Time Triggered Protocol”) network is employed in the preferred embodiment of the invention for communications management.
• Some of the information collected by the[0102]sensors100, such as chassis velocity, fuel level, and system temperature and pressure, is useful to a vehicle driver for operating the chassis and detecting system malfunctions. As shown in FIG. 14, thesensors100 are connected to theelectrical connector91 through achassis computer153. Sensor signals101 carrying information are transmitted from thesensors100 to thechassis computer153, which processes the sensor signals101 according to a stored algorithm. Thechassis computer153 transmits the sensor signals101 to theelectrical connector91 when, according to the stored algorithm, the sensor information is useful to the vehicle driver. For example, asensor signal101 carrying temperature information is transmitted to theelectrical connector91 by thechassis computer153 when the operating temperature of thechassis10 is unacceptably high. A driver-readable information interface155 may be attached to a complementaryelectrical connector95 coupled with theelectrical connector91 and display the information contained in the sensor signals101. Driver-readable information interfaces include, but are not limited to, gauges, meters, LED displays, and LCD displays. The chassis may also contain communications systems, such as antennas and telematics systems, that are operably connected to an electrical connector in the body-attachment interface and configured to transmit information to an attached vehicle body.
• One control unit may serve multiple functions. For example, as shown in FIG. 15, a[0103]master control unit159 functions as the steering control unit, braking control unit, suspension control unit, and energy conversion system control unit.
• Referring again to FIG. 15, the[0104]energy conversion system67 is configured to transmit electrical energy to theelectrical connector91 to provide electric power for systems located on an attached vehicle body, such as power windows, power locks, entertainment systems, heating, ventilating, and air conditioning systems, etc. Optionally, if theenergy storage system69 includes a battery, then the battery may be connected to theelectrical connector91. In the preferred embodiment, theenergy conversion system67 includes a fuel cell stack that generates electrical energy and is connected to theelectrical connector91.
• FIG. 16 shows a[0105]chassis10 with rigid covering, or “skin,”161 and an electrical connector orcoupling91 that functions as an umbilical port. Therigid covering161 may be configured to function as a vehicle floor, which is useful if an attachedvehicle body85 does not have a lower surface. In FIG. 17 a similarly equippedchassis10 is shown with an optional verticalfuel cell stack125. The verticalfuel cell stack125 protrudes significantly into the body pod space which is acceptable for some applications. Thechassis10 also includes a manualparking brake interface162 that may be necessary for certain applications and therefore is also optionally used with other embodiments.
• FIG. 18 depicts an embodiment of the invention that may be advantageous in some circumstances. The[0106]energy conversion system67 includes aninternal combustion engine167 with horizontally-opposed cylinders, and atransmission169. Theenergy storage system69 includes agasoline tank171.
• FIG. 19 depicts an embodiment of the invention wherein the[0107]steering system81 has mechanical control linkages including asteering column173. Passengerseating attachment couplings175 are present on thebody attachment interface87, allowing the attachment of passenger seating assemblies to thechassis10.
• FIGS. 20 and 20[0108]adepict achassis10 within the scope of the invention and abody85 each having multipleelectrical connectors91 and multiple complementaryelectrical connectors95, respectively. For example, a firstelectrical connector91 may be operably connected to the steering system and function as a control signal receiver. A secondelectrical connector91 may be operably connected to the braking system and function as a control signal receiver. A thirdelectrical connector91 may be operably connected to the energy conversion system and function as a control signal receiver. A fourthelectrical connector91 may be operably connected to the energy conversion system and function as an electrical power connector. Four multiple wire in-line connectors and complementary connectors are used in the embodiment shown in FIGS. 20 and 20a. FIG. 20adepicts an assembly process for attachingcorresponding connectors91,95.
• Referring to FIG. 21, a further embodiment of the claimed invention is depicted. The[0109]chassis10 has arigid covering161 and a plurality of passengerseating attachment couplings175. A driver-operablecontrol input device177 containing a steering transducer, a braking transducer, and an energy conversion system transducer, is operably connected to the steering system, braking system, and energy conversion system bywires179 and movable to different attachment points.
• The embodiment depicted in FIG. 21 enables bodies of varying designs and configurations to mate with a common chassis design. A vehicle body without a lower surface but having complementary attachment couplings is matable to the[0110]chassis10 at the load-bearingbody retention couplings89. Passenger seating assemblies may be attached at passengerseating attachment couplings175.
• FIG. 22 illustrates a range of bodies or body pods[0111]211-214 that may be employed on a single chassis or rollingplatform215. The owner of the rollingplatform215 can adapt to seasonal changes or lifestyle changes by simply changing vehicle body pods. The rolling platform comprises most of the durable hardware, meaning body pods require far less material and energy to produce than complete vehicles.
• Referring to FIG. 23, the process of securing optional bodies or body pods is depicted. Body pods can be hot swapped on a random time interval basis according to the whim of the driver or on a scheduled basis according to the guidelines of the vehicle pod provider. This aspect provides a business model of how a vehicle body can be rented, leased, exchanged, or sold. The process of vehicle body interchangeability provides that the consumer can disconnect and connect vehicle bodies quickly without headaches of complexity. Just lift off and drop pods with mechanical and electrical common interface connections as described previously. Initially, the driver secures the use of a rolling[0112]chassis241 and abody pod242. A bodypod service provider245 maintains an inventory ofbody pods246 that are either available on site, ordered to specification, or in use by other drivers and rotated among a group of drivers according to schedule. Each body pod carries a chip that may communicate parameters to the rolling chassis to set fuel cell performance or engine performance to match the body pod, adjusts suspension performance, adjusts steering performance and communicates other specifications.
• The manufacture of chassis or rolling platforms and body pods is depicted in FIG. 24. In the conventional manufacturing processes, the automobile is manufactured as a single unitary system. According to the present invention, the rolling platform system is manufactured independently of the vehicle body pods. The rolling platform, which contains a majority of the technological and mechanical content, is exported from central manufacturing locations to any location around the world. The vehicle bodies are manufactured in the same central locations or in local environments incorporating local materials and matched to the needs of the local market.[0113]
• Engineering of the rolling platform enables the vehicle body to be designed and produced independently. Bodies are manufactured and designed substantially independently anywhere in the world to meet different consumer desires. Local manufacturers, using locally available materials, can build vehicle bodies according to local tastes. Without a coupled body, the rolling platform manufacturing process is streamlined for production at key manufacturing sites around the world for exportation to points of purchase. Designers have the ability to redesign vehicle bodies without reengineering the entire vehicle.[0114]
• According to the embodiment shown in FIG. 24, a[0115]factory250 manufactures body pods (a.k.a. bodies) according to a plurality of designs251-253. The body pods are complete, or essentially complete, ready to be interconnected with a rolling chassis. All body pod styles251-253 are designed to be connected to a rolling chassis having common connection points. Asecond factory255 which can be located remote from thefactory250, or can be the same factory, produces rollingchassis256. The rollingchassis256 each have common connection points for connecting to a plurality of body pods.
• Turning to FIG. 25, a business process model is illustrated wherein an owner secures a rolling[0116]chassis220 for x years by means such as a purchase, with or without financing, or under a lease. The rolling chassis may be mortgaged for20 years, for example, wherein the expense is spread out over the expected reasonable serviceability life of the unit. The terms of the transaction includecertain software upgrades221 and hardware/software upgrades222 that are provided without additional charge andother upgrades223 that are secured by the owner/lessee (driver) at their option and at additional cost. At the end of the 20 year span (or other term), the rolling chassis may be owned with no security obligation remaining to the original financing entity.
• During the life of the rolling chassis, the vehicle is used according to their changing tastes or needs. For example, a scenario wherein a driver starts with a small,[0117]sporty body pod226, advances to a utilitariantype body pod228, then to a sport-utilitytype body pod230, a vantype body pod232 and onto a station wagontype body pod234 is possible. Of course, the type of body pods chosen and the time to change is completely discretionary.
• Referring to FIG. 26 a[0118]business process260 is illustrated. First, a vehicle body interchangeability system is established (step262), wherein a standard body/chassis interface is designed, such as the previously describedinterface87, to enable the attachment of any of a plurality of different body types to a single chassis design. The interchangeability system may be pre-established, in which case the remaining business process steps would be performed based upon the pre-established interface system. Similarly, other steps of the business process described in FIG. 26 may be performed independently from other process steps described.
• Once the vehicle body interchangeability is established (step[0119]262) vehicle chassis and bodies may be manufactured with the standard body/chassis interface (steps264 and266). A chassis inventory and body inventory may then be maintained (steps268 and270). As shown, the body inventory may include sedans, pick-up trucks, vans, sports-utility vehicles, convertibles, coupes, station wagons, mini-vans, trucks, and/or other types of transports. Each body would conform to the standardized body/chassis interface system to enable attachment to any chassis complying with the standardized body/chassis interface system. The chassis inventory may include a single chassis design or a family of chassis designs conforming with the standardized body/chassis interface system.
• Possession of a chassis may then be granted (step[0120]272) to a chassis owner (block274). The chassis owner may be an end user of the chassis (block276), an auto rental company (block278), etc. The chassis owner may, alternatively, be a lessee or renter of the chassis. Accordingly, the “chassis owner” (block274) may be considered a chassis possessor.
• A body from the body inventory may be sold, rented, or leased to the chassis owner (step[0121]280). This body may be attached to the owner's chassis (step282) without modification.
• As a result of the standardized body/chassis interface system, the chassis owner may select other bodies for attachment to the chassis. The first body may be detached from the chassis and a newly selected body may then be attached to the chassis without modification (step[0122]282). This exchange of vehicle bodies may occur in a specialized garage (block284) or in a location which is convenient for the chassis owner, such as in the owner's driveway (block286). The replacement body may be requested via the internet (block287), or by other electronic means, through the club membership or directly with the party maintaining the inventory.
• Specialty service units may be developed to exchange bodies remotely or in specialized garages. The service station could be mobile or fixed.[0123]
• The first body would be purchased, exchanged, stored, or disposed of after detachment (step[0124]288).
• Optionally, the chassis owner may gain access to the body inventory through a club membership (step[0125]290). Through the club membership, the chassis owner has the ability to order, reserve, rent, lease, exchange and purchase vehicle bodies on demand. The club membership may be purchased, or maintained by periodic membership payments.
• The vehicle chassis owner may also interchange vehicle bodies themselves as a result of the simplicity of the standardized body/chassis interface. The chassis owner may keep spare bodies in their own garage and exchange the bodies with an overhead crane type system.[0126]
• After the first body has been exchanged by the chassis owner to the body inventory, possession of the first body may then be granted to a third party (step[0127]292).
• Each of the above described business process steps may be performed by individual service units, or all operations may be performed by a single entity. For example, an individual service unit may provide a “swap-top” service wherein they deliver a replacement body to a location convenient to a customer, such as the customer's driveway or place of business. At that location, the customer's body would be detached from the customer's chassis, and the replacement body would be attached to the customer's chassis. The detached body would then be returned to an inventory of bodies, or attached to a different chassis.[0128]
• Alternatively, bodies may be swapped between friends, relatives, or club members. A service unit may perform the body swap at a convenient location selected by the customer. Further, the customer may store multiple bodies, and the swap service would perform the body swap for the customer at the storage location, such as the customer's home.[0129]
• Additionally, interior components of the body may be individually rented, leased, exchanged or sold separately from the body structure. For example, seats, consoles, electronic equipment, etc. may be acquired separately from the body structure and later exchanged to alter the vehicle interior. Further, body closures, such as door panels, hood panels, hatchback doors, etc. may be acquired individually and later exchanged to alter the vehicle exterior. These individual components of the body may be delivered, exchanged for other parts, and installed in a customer's vehicle by the swap service.[0130]
• Referring to FIG. 27, a business process is shown schematically in accordance with the invention to illustrate a variation in the combinations of steps which may be performed by a particular business entity. As shown, the[0131]business process310 includes the steps of manufacturing chassis with the standardized body/chassis interface (step312), and manufacturing bodies with the standardized body/chassis interface (step314). Possession of a chassis may then be offered and granted in a consumer transaction (step316), and similarly possession of a body may be offered and granted in a consumer transaction (step318).
• A body (such as a “first body”) may be provided or attached onto a chassis (step[0132]320). Thereafter, a body inventory may be maintained with a variety of different body types available therein, and replacement bodies may be offered from the inventory (step322).
• Once ordered, a replacement body (second body) may be delivered to the customer (step[0133]324). At the location selected by the customer, the first body may be removed from the chassis (step326), and the second body or replacement body may be attached to the chassis (step328). The second body has a body style different than the first body to form a different type of vehicle.
• As mentioned above, the above combination of method steps are merely exemplary, and different business entities may perform various combinations of the steps presented in the different embodiments, as set forth in the claims. Also, as set forth in the claims, various features shown and described in accordance with the different embodiments of the invention illustrated may be combined.[0134]
• While the best modes for carrying out the invention have been described in detail, those familiar with the art to which this invention relates will recognize various alternative designs and embodiments for practicing the invention within the scope of the appended claims.[0135]

Claims (38)

1. A method for modifying the functionality and aesthetic characteristics of a vehicle, comprising:

removing a first body from a vehicle chassis, wherein the first body and chassis form a first type of vehicle; and

attaching a second body to the chassis without subjecting the second body to significant value-added manufacturing processes, wherein the second body and chassis form a second type of vehicle different from the first type of vehicle and having different functionality and aesthetic characteristics.

2. The method ofclaim 1, wherein the chassis includes:

a structural frame; a suspension system mounted with respect to the structural frame; at least three wheels rotatably mounted with respect to the suspension system; an energy conversion system mounted with respect to the structural frame, operably connected to at least one wheel, and controllable by wire; and a by-wire braking system mounted with respect to the frame and operably connected to at least one wheel.

3. The method ofclaim 1, further comprising purchasing, exchanging, disposing of, or storing the first body.

4. The method ofclaim 1, further comprising maintaining an inventory of vehicle bodies which are selectively engageable with the chassis.

5. The method ofclaim 4, wherein said inventory comprises a plurality of bodies having at least3 different body styles of varying designs and body categories based upon aesthetics or functionality, each style of body being selectively attachable to the chassis.

6. The method ofclaim 5, wherein said inventory includes at least two body styles engageable with the chassis which are selected from the group consisting of sedans, pickup trucks, convertibles, coupes, vans, station wagons, sport-utility vehicles, and other types of transports.

7. The method ofclaim 4, further comprising offering the owner of the chassis a club membership wherein dues are paid for selective access to the vehicle body inventory.

8. The method ofclaim 7, wherein the club membership enables said owner to order, reserve, rent, lease or exchange vehicle bodies on demand.

9. The method ofclaim 8, wherein the owner is an individual end user of the chassis and body.

10. The method ofclaim 7, wherein the owner is a corporate consumer of the chassis and body.

11. The method ofclaim 10, wherein the corporate consumer is an auto rental company.

12. The method ofclaim 4, further comprising returning the first body to the inventory.

13. The method ofclaim 12, further comprising granting possession of the first body to a third party from the inventory for attachment to another vehicle chassis owned by the third party.

14. The method ofclaim 1, wherein said removing and attaching steps are performed at a location convenient to the possessor of the chassis, such as in the chassis possessor's driveway.

15. The method ofclaim 1, wherein said removing and attaching steps are performed in a specialized body exchange service station.

16. A method of remanufacturing a vehicle comprising:

providing a first body attached to a chassis at an attachment interface having body retention couplings in a fixed positional relationship to each other in the interface and a control signal receiving electrical connector, said chassis having wheels, a propulsion system for driving at least one of the wheels, and a power source for the propulsion system;

detaching the first body from the chassis by disengaging the body retention couplings and control signal receiving electrical connector in a non-destructive manner; and

attaching a second body to the chassis at the attachment interface by engaging the body-retention couplings and control signal receiving electrical connector to the second body, wherein the second body has a different body type than the first body.

17. The method ofclaim 16, further comprising maintaining an inventory of vehicle bodies having at least 3 different body styles of varying designs and body categories based upon aesthetics or functionality, each style of body being selectively attachable to the chassis.

18. The method ofclaim 17, wherein said inventory includes at least two body styles engageable with the chassis which are selected from the group consisting of sedans, pickup trucks, convertibles, coupes, vans, station wagons, sport-utility vehicles, and other types of transports.

19. The method ofclaim 17, further comprising offering a club membership wherein dues are paid for selective access to the vehicle body inventory.

20. The method ofclaim 19, wherein the club membership enables a customer to order, reserve, rent, lease or exchange vehicle bodies on demand.

21. The method ofclaim 20, wherein the customer is an individual end user of the chassis and body.

22. The method ofclaim 20, wherein the customer is a corporate consumer of the chassis and body.

23. The method ofclaim 20, wherein the corporate consumer is a rental company.

24. The method ofclaim 16, wherein said step of attaching the second body to the chassis is performed without subjecting the attachment interface of the chassis or second body to value-added manufacturing operations.

25. The method ofclaim 16, wherein said removing and attaching steps are performed at a location convenient to the possessor of the chassis.

26. The method ofclaim 16, wherein said removing and attaching steps are performed in a specialized body exchange service station.

27. A method of modifying a vehicle comprising:

delivering a replacement body to a customer;

detaching an attached body from the customer's chassis at a location selected by the customer; and

attaching the replacement body to the customer's chassis at said location.

28. The method ofclaim 27, wherein said location is in the customer's driveway.

29. The method ofclaim 27, wherein said chassis and each of said bodies conform to a standardized body/chassis interface system wherein connection components on the body and chassis are provided in a predetermined spatial relationship relative to each other to facilitate attachment of a variety of different types of bodies to a single chassis design.

30. A method of modifying a customer's vehicle comprising:

detaching an attached body from the customer's chassis at a location selected by the customer; and

attaching a different body to the customer's chassis at said location.

31. The method ofclaim 30, wherein said location is in the customer's driveway.

32. The method ofclaim 30, further comprising delivering said different body to said location.

33. The method ofclaim 30, wherein said chassis and each of said bodies conform to a standardized body/chassis interface system wherein connection components on the body and chassis are provided in a predetermined spatial relationship relative to each other to facilitate attachment of a variety of different types of bodies to a single chassis design or a family of chassis designs.

34. The method ofclaim 30, wherein the customer owns said attached body and said different body.

35. The method ofclaim 30, wherein the customer leases said chassis and said different body.

36. The method ofclaim 30, wherein the customer owns said chassis and rents said different body.

37. The method ofclaim 30, further comprising receiving the customer's request for said different body via the internet.

38. The method ofclaim 30, wherein said different body is owned by a third party.

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