US20010029408A1 - Multi-module control-by-wire architecture - Google Patents

Abstract

A control-by-wire control system comprising a plurality of control device(s), each control device is responsive to, and configured to receive a control signal. Also included in the control-by-wire control system is a plurality of sensors wherein certain sensors are coupled to particular control devices. The sensors, each sense a parameter of the system and generate various sensor signals in response. A plurality of control modules is also included in control-by-wire control system. Each control module is interfaced to at least one of the control devices and is adapted to receive at least one or more sensor signals. The control modules also generate control signals for communication to the control devices. A communication interface of at least two communication networks provides communications among various control modules.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS
• This application claims the benefit of United States provisional application No. 60/178,924, filed Feb. 01, 2000 the contents of which are incorporated by reference herein in their entirety.[0001]
BACKGROUND OF THE INVENTION
• Steering and braking equipment assist a driver of a vehicle to direct and brake the vehicle in a controlled, predictable manner. In conventional steering assemblies, the operator controls the direction of the vehicle with the aid of a steering wheel. This wheel is mechanically connected, usually through a gear assembly to the roadwheels. In conventional braking systems, the operator controls the deceleration of the vehicle by applying a force to a pedal, displacing hydraulic fluid to transmit the force to a piston, which in turn applies force to a braking surface to slow the vehicle. To aid the operator, many steering and braking systems utilize an auxiliary system to generate additional force that is transmitted to a steering gear or braking assembly. The additional force reduces the effort required by the operator providing an “assist” or boost. Typically, this auxiliary force is generated by either a hydraulic drive or an electric motor.[0002]
• In the case of steering systems, the steering wheel is mechanically connected directly to the roadwheels, the resulting mechanical assembly that provides the connection can be quite complicated and expensive to produce. Likewise, for braking systems, the configuration of hydraulic systems for braking may be complex, can leak, and are subject to contamination.[0003]
• One advantage in having a direct connection is that the operator receives tactile feedback through the mechanical connections to the actuated component. For example, if the vehicle changes directions while it is moving, the operator will feel resistance in the steering wheel. However, such systems inherently include fabrication and implementation limitations and lack the capability to dynamically tailor system response characteristics to accommodate a variety of environmental conditions[0004]
• Steer-By-Wire, Brake-By-Wire, or Drive-By-Wire systems overcome some of these limitations by allowing for electronic control of braking and steering of a vehicle. Such systems can control the steering and braking functions of a vehicle using a control device, such as a steering wheel and brake pedal or joystick. Typically, these systems have more than one communication channel for communicating signals from the control device to the steering and braking motors such that, when that communication channel experiences an error, the entire system is not inoperable. However, these systems may not provide the best utilization of sensors, components, actuators, or controllers.[0005]
• Control systems with redundant communications networks are typically accomplished using two different families of device controllers, wherein each family (e.g., braking and steering) of device controllers operates independently on two separate networks. These redundant systems require a significant amount of hardware, which is difficult and expensive to package in a vehicle with a control-by-wire system.[0006]
• Control-by-wire generally refers to control of vehicular systems where the operator input and associated actuating device, such as for example a brake caliper or steering actuator, are connected by wire or wireless connection rather than a physical apparatus. Rather than such physical apparatus communicating a force, motion, or other actuating means directly to the actuating device, this connection, communicates a command signal to the actuating device, corresponding to the desired response of the actuating device. Integrated control-by-wire system and system architecture is also referred to as “X-by-Wire” to identify that more than one system or type of system is controlled “by wire”.[0007]
• Therefore, is it considered advantageous to identify an X-by-Wire control system and architecture that provides customizable system functional characteristics and optimizes controller and component utilization.[0008]
BRIEF SUMMARY OF THE INVENTION
• A control-by-wire control system comprising a plurality of control device(s), each control device responsive to, and configured to receive a control signal. Also included in the control-by-wire control system is a plurality of sensors wherein certain sensors are coupled to particular control devices. The sensors, each sense a parameter of the system and generate various sensor signals in response. A plurality of control modules is also included in control-by-wire control system. Each control module is interfaced to at least one of the control devices and is adapted to receive at least one or more sensor signals. The control modules also generate control signals for communication to the control devices. A communication interface of at least two communication networks provides communications among various control modules. The control-by-wire control system is architected to ensure that inoperability of any one of the control devices, control modules, sensor signals, or communication networks, will not result in loss of functional capability of the control-by-wire system.[0009]
BRIEF DESCRIPTION OF THE DRAWINGS
• Referring now to the accompanying drawings, which are meant to be exemplary, not limiting, and wherein like elements are numbered alike in the several figures.[0010]
• FIG. 1 is a block diagram depicting a six-control module interconnection architecture;[0011]
• FIG. 2 is a block diagram of the architecture of FIG. 1 depicting steering and braking function interconnectivity; and[0012]
• FIG. 3 is a block diagram depicting a power distribution topology based upon the architecture identified in FIG. 1.[0013]
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
• The disclosed X-by-Wire system architecture integrates brake-by-wire and steer-by-wire subsystems to afford synergistic control opportunities for braking, steering, and other aspects of vehicle dynamic control not available with such subsystems separately, in addition to the traditional steering and braking functions. For example, the architecture may be adapted to address and control additional vehicle characteristics and dynamics such as vehicle dynamic stability, or vehicle roll control via active suspension components. It will be appreciated that various functions in addition to steering and braking may also be mapped to the architecture. Functional requirements for system performance and capabilities dictate the manner in which functions are mapped and the configuration of system elements. For example, the braking and steering control functions are allocated to various component elements to ensure that loss of a single component or system capability does not result in the loss of a particular system functionality. However, the system architecture may be expanded to address additional levels of system operability. Moreover, replicated versions of allocated functions may be further allocated to control elements to address a multiplicity of component degradation(s). The degree of expansion of the architecture may be dictated by the level of fault tolerance prescribed by the particular vehicular system requirements. Finally, an architecture is disclosed which provides for adaptation and reallocation of functional capabilities from non-operative to operative system elements and components to ensure increased levels of operability and reliability.[0014]
• The disclosed embodiments may be utilized in various types of vehicles employing electronic vehicle control. For example, vehicles and systems employing: electronic steering, steer-by-wire, electronic braking, brake-by-wire, drive-by-wire, or control-by-wire implementations. An exemplary embodiment, by way of illustration is described herein as it may be applied to an automobile employing a X-by-Wire system. While an exemplary embodiment is shown and described by illustration and reference to an integrated automobile steering and braking system, it will be appreciated by those skilled in the art that the invention is not limited to automobiles alone and may be applied to a variety of vehicles employing electronic steering or braking systems, or steer-by-wire, or- brake-by-wire systems. In the control-by-wire systems, the signal inputs are typically generated by an operator-interfaced source, e.g., steering wheel, brake pedal and/or a joystick as well as sensors detecting and measuring vehicle and component parameters. The control modules receive the signal inputs, generate control signals and communicate these control signals to the control devices associated with the particular control module and function.[0015]
• Referring to FIG. 1, an exemplary embodiment of a six-module controller interconnection architecture of an X-by-[0016]Wire system10 is disclosed including dual-redundant communication bus interfaces. Such communication interfaces hereafter denoted networks, may include, but not be limited to, communications networks, bus systems or configurations, asynchronous and synchronous communications systems and protocols, and the like, as well as combinations thereof. In addition, communications networks and signal interfaces may take any form capable of transferring a signal or data, including electrical, optical, or radio and may include and employ various technologies in implementation, such as wired, wireless, fiber optic, and the like, including combinations thereof.
• For example, the communications networks may be a redundant communications system and protocol such as defined by Time Triggered Protocol (TTP™) or MIL-STD-1553 and the like. In an embodiment, communication networks employing TTP™ are utilized. TTP™ is a time deterministic protocol, redundantly configured with two channels providing redundant communication capabilities for various control and data signals between control modules[0017]12a-12g. The second communication channel, provides additional signal capacity for communications between control modules12a-12gspecifically to facilitate continued operation should the first become inoperative available. The communication interface allows coordinated action among control modules performing control functions as well as the exchange of sensor signals among the control modules.
• FIG. 2 is a block diagram of the system architecture of FIG. 1 depicting integrated steering and braking function interconnectivity in an exemplary embodiment of a multifunction control or X-by-Wire (XBW)[0018]system10. Throughout this document control-by-wire, X-by-wire, and Drive-by-wire will be utilized and treated synonymously as X-by-wire or XBW for short. In the Figures, a plurality of control module(s)12a-12gare depicted in a configuration distributing the functional control requirements of the X-by-Wire system10. The control modules12a-12gare each adapted to include the necessary sensor interfaces to receive a variety of sensor signals as well as generate control signals to command a corresponding control device(s)16a-16d. Additionally, each control module is configured to include self-diagnostic capabilities. Thereby, ensuring that every control module12a-12gmay internally evaluate its capabilities to perform the processes prescribed by its functional allocations. In order to perform the prescribed functions and allocated processing, as well as the computations therefore (e.g., the execution of control algorithm(s), and the like), the control modules12a-12gmay include, but not be limited to, a processor(s), computer(s), memory, storage, register(s), timing, interrupt(s), communication interfaces, and input/output signal interfaces, as well as combinations comprising at least one of the foregoing. For example, control modules12a-12gmay include input signal filtering to enable accurate sampling and conversion or acquisitions of such signals from communications interfaces. Additional features of the control modules12a-12gand certain allocated processes therein are thoroughly discussed at a later point herein.
• In an embodiment, six control modules[0019]12a-12fare employed in a vehicle with functions allocated to the various system elements as follows. Road wheel steering is allocated to controlmodules12aand12b. Similarly, front braking is allocated to controlmodules12cand12d. Finally, rear braking and hand wheel steering functions are allocated to controlmodules12eand12f. Afirst communication network14aand asecond communication network14bare utilized to facilitate the communications between each of the control modules12a-12f. The first andsecond communication networks14aand14bare configured to maximize the communication bandwidth by appropriate partitioning of the functional requirements allocated to both the first andsecond communication networks14aand14bas well as the control modules12a-12f. For example, steering may be primarily allocated to thefirst communication network14awhile braking primarily allocated to thesecond communication network14b. Architecture isolation of thecontrol modules12cand12dperforming front braking from thecontrol modules12aand12ballocated to road wheel steering provides enhanced tolerance ofXBW system10 functionality to loss of control capability. For example, loss ofcontrol modules12aand12bcould be compensated for by the adaptation ofcontrol modules12cand12dto perform both braking functions as well as steering in the event of the loss of all steering system functionality.
• Returning to the first and[0020]second communication networks14aand14b, cross control module communication is facilitated between control modules performing similar functions. For example, cross control module communication is provided between control module(s)12aand12bperforming steering, between thecontrol modules12cand12dperforming braking, and finally betweencontrol modules12eand12fperforming rear braking and hand wheel steer functions.
• FIGS. 1 and 2 further illustrate an embodiment including the interconnection of another control module functioning as a supervisory controller (commonly denoted a master)[0021]12g. Thesupervisory controller12gis configured to provide the primary gateway for facilitating communication and data transfer between the first andsecond communication networks14aand14b. Thereby, providing for example, communication and yet isolation between the first andsecond communication networks14aand14bor more specifically between control modules allocated to one functionality such as braking and those control modules allocated to steering functions. Similarly,control modules12eand12fare also configured to provide a second and third capability for data transfer between the first andsecond communication networks14aand14b. It may be noted that the functional allocation to asupervisory controller12gneed not be allocated to a particular control module12. Such allocation may be distributed among the control modules of theXBW system10.
• The[0022]supervisory controller12gis also configured to provide for coordination of various allocated functions among the control modules to facilitate additional vehicle capabilities and functions. For example, thesupervisory controller12gmay provide coordination between the steering and braking functions to facilitate enhanced vehicle dynamics.
• Continuing with FIGS. 1 and 2, the sensor interfaces to the control modules[0023]12a-12gare illustrated. The control modules perform the sensor conditioning and transfer of data to the first andsecond communication networks14aand14b. In some instances the direct connection of the sensor interfaces to controllers may also be desirable. For example, the steering wheel absolute positions are interfaced to thesupervisory controller12g. This direct interface permits continued driver input functionality even in the event of two successive losses or degradations of hand wheel steering functionality. In the disclosed embodiment, the architecture allocates steering command information to only two modules, therefore, to ensure a third means of acquiring and distributing steering command information, the absolute position sensors are independently interfaced to thesupervisory controller12g. Similarly, a first and second brake switches along with a parking brake switch are also interfaced directly to thesupervisory controller12gto ensure additional means of acquiring these signals to support certain braking functions.
• A plurality of sensors (not shown) are distributed throughout the[0024]XBW system10 and disposed within the vehicle as necessary to measure various vehicle or system parameters. A parameter of the X-by-Wire system10 includes, but is not limited to characteristics, measurements, status, dynamic conditions, and states of any element of the X-by-Wire system10 or vehicle. For example, positions, forces, velocities, accelerations, operating states and the like.
• The allocation of functions to sensors and selection of sensors once again is dictated by system functional requirements. For example, the sensors are selected based upon the parameters that must be detected and measured to ensure proper control system command, operation, and functionality. Moreover, the sensors detect operator commanded control inputs for control system response. Sensors may be redundant in cases where the architecture dictates that additional information is necessary or there is a requirement for increased reliability for the measured information. For example, multiple sensors are allocated to the road wheel steering functionality as part of the feedback control for vehicle steering. The sensors are coupled to each of the respective control modules[0025]12a-12gas functionally allocated and distributed. The sensors are further coupled to corresponding control devices16a-16das functionally allocated by the architecture for sensing vehicle parameters and parameters associated with each control device16a-16dand responsively generating sensor signals.
• Continuing once again with FIGS. 1 and 2, the sensor interfaces as allocated to the numerous control modules[0026]12a-12gare also depicted. More specifically, the sensor signals as distributed within the architecture are shown. In an embodiment, the sensor interfaces functionally allocated to the road wheel steering, or more particularly to the control modules allocated to road wheel steer functions12aand12binclude, but are not limited to: absolute position signals; digital position signal, left road wheel forces, and right road wheel forces. Each sensor includes multiple independent interfaces to each of thecontrol modules12aand12b. Similarly, the sensor interfaces for thecontrol modules12cand12dallocated to front braking include, but are not limited to: brake pedal forces, brake pedal positions, brake switch state (alternatively or in combination with a park brake switch acting as an emergency brake apply signal) respective brake caliper forces and respective wheel speeds.
• Finally, the sensor interfaces for the[0027]control modules12eand12fallocated to hand wheel steering and rear braking include, but are not limited to: absolute position signals; digital position signals; hand wheel torque signals, brake pedal forces, brake pedal positions, brake switch state; park brake switch; respective brake caliper forces and respective wheel speeds. In addition to the driver command signals, eachcontrol module12c,12d,12e, and12fallocated to braking functions conditions the corresponding wheel speed sensor signal as well as transferring it to the system communications bus.
• Also depicted in FIGS. 1 and 2 is the architecture of interconnection from the respective control modules[0028]12a-12gto a variety of control devices16. The control devices16 may include, but not be limited to single or dual winding electric motors configured as desired to apply a controlling input to direct or control the vehicle (e.g., torque, force, or displacement). The control devices16 are also allocated to address the system functionality and are distributed accordingly. Each control device16 is adapted to receive control signals from its corresponding control module12a-12f.
• In an embodiment, control device(s)[0029]16 allocated to the road wheel steering and hand wheel steering functions comprise dual windingelectric motors16a,16b, and16crespectively; each of which share a common housing and rotor. The control device(s)16 allocated to braking comprise single windingelectric motors16d. For example, the road wheel steering function includes two dual windingelectric motors16aand16bconnected to a gear assist mechanism to steer the directable wheels of a vehicle (e.g., the front wheels of an automobile). Eachcontrol module12aand12ballocated to road wheel steering would be responsible to control two motor circuits in this circumstance. Likewise, the braking functions include fourelectric motors16dconnected to a reduction mechanism and to each wheel of a vehicle to facilitate braking. Each control module allocated to braking12c,12d, as well as12eand12fis configured to control arespective control device16d.
• Included within each[0030]control device16care appropriate feedback sensors allocated to detect positions and forces. As described above, each of the sensors interfaced to therespective control modules12e,12f, and12g. Unique to the hand wheel steering functionality are additional position feedback sensors. Employing redundant feedback satisfies an architecture constraint that theXBW system10, include the capability to tolerate the presence of a first component error within the hand wheel feedback force function. This constraint ensures that the operator continues to be provided tactile feedback following such an error. Such tactile feedback aids the operator in maintaining vehicle stability and control. Especially under dynamic steering conditions where the operator may exhibit a tendency to make excessive command inputs.
• The[0031]control device16cmay further include passive elements (e.g., springs, dampers friction plates and the like) to provide feedback force and are not currently shown in the system architecture. Included within eachcontrol device16dare appropriate feedback sensors allocated to detect positions and forces. As described above, each of the sensors is interfaced to the respective control modules12a-12g. In addition, the control device(s)16dinclude a caliper force measurement sensor to provide force feed back to therespective control modules12c,12d,12e, and12ffacilitating braking functionality. Moreover, the control modules may also monitor the current delivered on each controllable device16 to estimate the force being applied for additional feed back information.
• Moving now to FIG. 3 a power distribution architecture for the control-by-[0032]wire system10 is depicted. In an embodiment, three independent sources of power for the X-by-wire system10 are depicted. Two battery supplies Battery X20 andBattery Z22, supply thecontrol modules12aand12ballocated to the steer functions, whereas theAlternator Y24 supplies thecontrol modules12c, and12dallocated to front braking. It is noteworthy to appreciate that a three level hierarchy of capability is provided for both steering and braking functions (given that Battery X20 andBattery Z22 supplies are inoperative) bycontrol modules12cand12dutilizing theAlternator Y24 power supply to perform a steer by braking functionality. Therefore, triple redundancy of the steering functions may be accomplished through the utilization of three independent power supplies as depicted.
• Each control module directs and sources the necessary power for each of the corresponding control device(s). Each of the control modules[0033]12 also functions as power loads only. Any regenerated energy will be dissipated within the corresponding control module(s)12 and control device(s)16. Therefore each control module12 will also include a means of depleting this energy as well as a means of ensuring that this energy is not directed back to theindependent power sources20,22,24. For example, this may be accomplished by a diode, rectification and load, or active device protection.
• In an embodiment, two[0034]control modules12aand12bare adapted to deliver control signals to control device(s)16aand16b, which may be more particularly, two dual wound motors disposed at each steerable front wheel of a vehicle. Each control module (for example12a) communicates with the other control module(s) (in thiscase12bspecifically) via thecommunication network14a. Eachcontrol module12aand12boperates independently, such that if one control module (e.g.,12a) with associated control device(s)16ais no longer operative, the second control module (e.g.,12b) can provide some limited level of control. If acontrol module12aor12bdetects an error, thatcontrol module12aor12bdiscontinues commanding therespective control device16aor16b, while still providing communications to theother control modules12c-12g.
• In another embodiment, the X-by-[0035]wire system10 further includes twocontrol modules12eand12f, adapted to deliver control signals to control device(s)16c, which may be more particularly, a dual wound motor disposed at the hand wheel of a vehicle for receiving operator input and providing tactile feedback to the operator. In addition,control modules12eand12fare each coupled to control device(s)16ddisposed at each rear wheel. Once again, which may be more specifically, to two brake motors. Each control module (for example12e) communicates with the other control module(s) (in thiscase12f) via thecommunication network14b. Eachcontrol module12eand12foperates independently, such that if one control module for example12ewith associated control device(s)16cand16dis no longer operative, the second control module, for example12fcan provide some limited level of control. If acontrol module12eor12fdetects an error, the control module12 discontinues commanding thecorresponding control device16cor16d, while still providing communications to theother control modules12a,12b,12c,12d, and12g.
• In yet another embodiment, the X-by-[0036]Wire system10 further includes two additional control device(s)16d, for example, brake motors, which may be disposed one at each front wheel of a vehicle, and to which control signals are communicated by two additional associated control modules in this instance,12cand12d. Once again,control module12ccommunicates control signals to controldevice16ddisposed in this instance at the left wheel, for braking and communicates with all other control modules12a-12g. Similarly,control module12dcommunicates control signals to controldevice16d, disposed in this instance at the right wheel, for braking and communicates with all other control modules12a-12g. If acontrol module12cor12ddetects an error, it discontinues controlling therespective control device16d.
• The disclosed method may be embodied in the form of computer-implemented processes and apparatuses for practicing those processes. The method can also be embodied in the form of computer program code containing instructions embodied in tangible media, such as floppy diskettes, CD-ROMs, hard drives, or any other computer-readable storage medium, wherein, when the computer program code is loaded into and executed by a computer, the computer becomes an apparatus capable of executing the method. The present method can also be embodied in the form of computer program code, for example, whether stored in a storage medium, loaded into and/or executed by a computer, or as data signal transmitted whether a modulated carrier wave or not, over some transmission medium, such as over electrical wiring or cabling, through fiber optics, or via electromagnetic radiation, wherein, when the computer program code is loaded into and executed by a computer, the computer becomes an apparatus capable of executing the method. When implemented on a general-purpose microprocessor, the computer program code segments configure the microprocessor to create specific logic circuits.[0037]
• Therefore, the foregoing disclosure provides methodologies and systems for allocating the functionality of a control-by-system to a plurality of elements, while ensuring that the loss of operational capability of any one element does not result in a loss of a prescribed functionality. In addition it will be appreciated that the disclosed embodiments provides for mapping and/or re-mapping of functions to other control modules as may be prescribed by system requirements.[0038]
• While preferred embodiments have been shown and described, various modifications and substitutions may be made thereto without departing from the spirit and scope of the invention. Accordingly, it is to be understood that the present invention has been described by way of illustration only, and such illustrations and embodiments as have been disclosed herein are not to be construed as limiting to the claims.[0039]

Claims (100)

What is claimed is:

1. A control-by-wire control system for implementing a plurality of control functions comprising:

a plurality of control device(s), disposed in a vehicle, wherein each control device of said plurality of control devices is responsive to and configured to receive a control signal;

a plurality of sensors, wherein at least two sensors of said plurality of sensors are coupled to at least two control devices of said plurality of control devices for sensing a parameter of said system and generating a plurality of sensor signals responsive thereto;

a plurality of control modules, wherein each control module of said plurality of control modules is interfaced to at least one of said plurality of control devices and is adapted to receive at least one sensor signal of said plurality of sensor signals, and generates said control signal for communication to said at least one control device of said plurality of control devices;

a communication interface having a first communication network and a second communication network for communicating among said plurality of control module(s);

a plurality of independent power sources interfaced to said plurality of control modules;

wherein said plurality of control functions is distributed among and allocated to said plurality of control modules; and

wherein loss of operational capability of any one of said plurality of control devices, any one of said plurality of control modules, any one of said plurality of sensor signals, any one of said plurality of independent power sources, said first communication network, said second communication network does not result in loss of functional capability of said control-by-wire control system.

2. The system of

claim 1

, wherein at least one control device of said plurality of control devices is adapted to control road wheel steering of said vehicle.

3. The system of

claim 2

, wherein said at least one control device comprises a dual winding electric motor configured to control a steerable wheel of said vehicle.

4. The system of

claim 1

, wherein at least one of said control devices is adapted to control braking of said vehicle.

5. The system of

claim 4

, wherein said at least one control devices comprises an electric motor disposed at a wheel of said vehicle.

6. The system of

claim 1

, wherein at least one of said control devices is adapted to control hand wheel steering of said vehicle.

7. The system of

claim 6

, wherein said at least one control device comprises a dual winding electric motor.

8. The system of

claim 1

, wherein each control module of said plurality of control modules comprises a self-diagnostic controller configured to test and evaluate processes performed therein and communicates data and status via said communication interface.

9. The system of

claim 8

, wherein at least two of said control modules are adapted to control road wheel steering of said vehicle.

10. The system of

claim 8

, wherein at least two of said control modules are adapted to control braking of said vehicle.

11. The system of

claim 8

, wherein at least two of said control modules are adapted to control hand wheel steering of said vehicle.

12. The system of

claim 1

, wherein said communication interface comprises at least two communication networks, wherein each network comprises at least two channels.

13. The system of

claim 1

, wherein said first communication network is coupled to at least two control modules of said plurality of control modules allocated to road wheel steering functionality.

14. The system of

claim 1

, wherein said first communication network is coupled to at least two control modules of said plurality of control modules allocated to hand wheel steering functionality.

15. The system of

claim 1

, wherein said first communication network is coupled to a control module of said plurality of control modules allocated to supervisory functionality.

16. The system of

claim 1

, wherein said second communication network is coupled to at least two control modules of said plurality of control modules allocated to front wheel braking functionality.

17. The system of

claim 1

, wherein said second communication network is coupled to at least two control modules of said plurality of control modules allocated to rear wheel braking functionality.

18. The system of

claim 1

, wherein said second communication network is coupled to a control module of said plurality of control modules allocated to supervisory functionality.

19. The system of

claim 1

, wherein said first communication network and said second communication network are coupled to a control module of said plurality of control modules allocated to supervisory functionality.

20. The system of

claim 1

, wherein said first communication network and said second communication network are coupled to at least two control modules of said plurality of control modules allocated to hand wheel steering and rear braking functionality.

21. The system of

claim 1

, wherein a parameter of said system comprises characteristics, dynamics conditions, and states of any element of said system.

22. The system of

claim 1

, wherein each control module of said plurality of control modules is interfaced to at least one independent power source of said plurality of independent power sources.

23. The system of

claim 22

, wherein each control module of said plurality of control modules allocated to braking is interfaced to at least two independent power sources of said plurality of independent power sources.

24. The system of

claim 22

, wherein each control module of said plurality of control modules allocated to supervisory functions is interfaced to each independent power sources of said plurality of independent power sources.

25. The system of

claim 1

, wherein said plurality of control functions includes redundant functional capabilities such that a control function of said plurality of control functions are replicated and distributed among and allocated to said plurality of control modules

26. The system of

claim 25

, wherein each control module of said plurality of control modules allocated to a particular control function.

27. The system of

claim 25

, wherein said plurality of control functions is allocated to six control modules.

28. The system of

claim 27

wherein said plurality of control functions includes braking, road wheel steering, hand wheel steer functions, and coordinated steering and braking functions.

29. The system of

claim 25

, wherein at least one of said control devices is adapted to control braking of said vehicle.

30. The system of

claim 29

, wherein said at least one control devices comprises an electric motor disposed at a wheel of said vehicle.

31. The system of

claim 29

, wherein at least one of said control devices is adapted to control hand wheel steering of said vehicle.

32. The system of

claim 31

, wherein said at least one control device comprises a dual winding electric motor.

33. The system of

claim 31

, wherein each control module of said plurality of control modules comprises a self-diagnostic controller configured to test and evaluate processes performed therein and communicates data and status via said communication interface.

34. The system of

claim 33

, wherein at least two of said control modules are adapted to control road wheel steering of said vehicle.

35. The system of

claim 33

, wherein at least two of said control modules are adapted to control braking of said vehicle.

36. The system of

claim 33

, wherein at least two of said control modules are adapted to control hand wheel steering of said vehicle.

37. The system of

claim 33

, wherein said communication interface comprises at least two communication networks, wherein each network comprises at least two channels.

38. The system of

claim 37

, wherein said first communication network is coupled to at least two control modules of said plurality of control modules allocated to road wheel steering functionality.

39. The system of

claim 38

, wherein said first communication network is coupled to at least two control modules of said plurality of control modules allocated to hand wheel steering functionality.

40. The system of

claim 39

, wherein said first communication network is coupled to a control module of said plurality of control modules allocated to supervisory functionality.

41. The system of

claim 40

, wherein said second communication network is coupled to at least two control modules of said plurality of control modules allocated to front wheel braking functionality.

42. The system of

claim 41

, wherein said second communication network is coupled to at least two control modules of said plurality of control modules allocated to rear wheel braking functionality.

43. The system of

claim 42

, wherein said second communication network is coupled to a control module of said plurality of control modules allocated to supervisory functionality.

44. The system of

claim 43

, wherein said first communication network and said second communication network are coupled to a control module of said plurality of control modules allocated to supervisory functionality.

45. The system of

claim 44

, wherein said first communication network and said second communication network are coupled to at least two control modules of said plurality of control modules allocated to hand wheel steering and rear braking functionality.

46. The system of

claim 45

, wherein a parameter of said system comprises characteristics, dynamics conditions, and states of any element of said system.

47. The system of

claim 46

, wherein each control module of said plurality of control modules is interfaced to at least one independent power source of said plurality of independent power sources.

48. The system of

claim 47

, wherein each control module of said plurality of control modules allocated to braking is interfaced to at least two independent power sources of said plurality of independent power sources.

49. The system of

claim 48

, wherein each control module of said plurality of control modules allocated to supervisory functions is interfaced to each independent power sources of said plurality of independent power sources.

50. The system of

claim 49

, wherein each control module of said plurality of control modules allocated to a particular control function of said vehicle is interfaced to an independent power source of said plurality of independent power sources.

51. A vehicle including a drive by wire control system comprising:

a plurality of control device(s), disposed in said vehicle, wherein each control device of said plurality of control devices is responsive to and configured to receive a control signal;

a plurality of sensors, wherein at least two sensors of said plurality of sensors are coupled to at least two control devices of said plurality of control devices for sensing a parameter of said system and generating a plurality of sensor signals responsive thereto;

a plurality of control modules, wherein each control module of said plurality of control modules is interfaced to at least one of said plurality of control devices and is adapted to receive at least one sensor signal of said plurality of sensor signals, and generates said control signal for communication to said at least one control device of said plurality of control devices;

a communication interface having a first communication network and a second communication network for communicating among said plurality of control module(s);

a plurality of independent power sources interfaced to said plurality of control modules;

wherein said plurality of control functions is distributed among and allocated to said plurality of control modules; and

wherein loss of operational capability of any one of said plurality of control devices, any one of said plurality of control modules, any one of said plurality of sensor signals, any one of said plurality of independent power sources, said first communication network, said second communication network does not result in loss of functional capability of said control-by-wire control system.

52. The vehicle of

claim 51

, wherein at least one control device of said plurality of control devices is adapted to control road wheel steering of said vehicle.

53. The vehicle of

claim 52

, wherein said at least one control device comprises a dual winding electric motor configured to control a steerable wheel of said vehicle.

54. The vehicle of

claim 51

, wherein at least one of said control devices is adapted to control braking of said vehicle.

55. The vehicle of

claim 54

, wherein said at least one control devices comprises an electric motor disposed at a wheel of said vehicle.

56. The vehicle of

claim 51

, wherein at least one of said control devices is adapted to control hand wheel steering of said vehicle.

57. The vehicle of

claim 56

, wherein said at least one control device comprises a dual winding electric motor.

58. The vehicle of

claim 51

, wherein each control module of said plurality of control modules comprises a self-diagnostic controller configured to test and evaluate processes performed therein and communicates data and status via said communication interface.

59. The vehicle of

claim 58

, wherein at least two of said control modules are adapted to control road wheel steering of said vehicle.

60. The vehicle of

claim 58

, wherein at least two of said control modules are adapted to control braking of said vehicle.

61. The vehicle of

claim 58

, wherein at least two of said control modules are adapted to control hand wheel steering of said vehicle.

62. The vehicle of

claim 51

, wherein said communication interface comprises at least two communication networks, wherein each network comprises at least two channels.

63. The vehicle of

claim 51

, wherein said first communication network is coupled to at least two control modules of said plurality of control modules allocated to road wheel steering functionality.

64. The vehicle of

claim 51

, wherein said first communication network is coupled to at least two control modules of said plurality of control modules allocated to hand wheel steering functionality.

65. The vehicle of

claim 51

, wherein said first communication network is coupled to a control module of said plurality of control modules allocated to supervisory functionality.

66. The vehicle of

claim 51

, wherein said second communication network is coupled to at least two control modules of said plurality of control modules allocated to front wheel braking functionality.

67. The vehicle of

claim 51

, wherein said second communication network is coupled to at least two control modules of said plurality of control modules allocated to rear wheel braking functionality.

68. The vehicle of

claim 51

, wherein said second communication network is coupled to a control module of said plurality of control modules allocated to supervisory functionality.

69. The vehicle of

claim 51

, wherein said first communication network and said second communication network are coupled to a control module of said plurality of control modules allocated to supervisory functionality.

70. The vehicle of

claim 51

, wherein said first communication network and said second communication network are coupled to at least two control modules of said plurality of control modules allocated to hand wheel steering and rear braking functionality.

71. The vehicle of

claim 51

, wherein a parameter of said system comprises characteristics, dynamics conditions, and states of any element of said system.

72. The vehicle of

claim 51

, wherein each control module of said plurality of control modules is interfaced to at least one independent power source of said plurality of independent power sources.

73. The vehicle of

claim 72

, wherein each control module of said plurality of control modules allocated to braking is interfaced to at least two independent power sources of said plurality of independent power sources.

74. The vehicle of

claim 72

, wherein each control module of said plurality of control modules allocated to supervisory functions is interfaced to each independent power sources of said plurality of independent power sources.

75. The vehicle of

claim 51

, wherein said plurality of control functions includes redundant functional capabilities such that a control function of said plurality of control functions are replicated and distributed among and allocated to said plurality of control modules

76. The vehicle of

claim 75

, wherein each control module of said plurality of control modules allocated to a particular control function.

77. The vehicle of

claim 75

, wherein said plurality of control functions is allocated to six control modules.

78. The vehicle of

claim 77

wherein said plurality of control functions includes braking, road wheel steering, hand wheel steer functions, and coordinated steering and braking functions.

79. The vehicle of

claim 75

, wherein at least one of said control devices is adapted to control braking of said vehicle.

80. The vehicle of

claim 79

, wherein said at least one control devices comprises an electric motor disposed at a wheel of said vehicle.

81. The vehicle of

claim 79

, wherein at least one of said control devices is adapted to control hand wheel steering of said vehicle.

82. The vehicle of

claim 81

, wherein said at least one control device comprises a dual winding electric motor.

83. The vehicle of

claim 81

, wherein each control module of said plurality of control modules comprises a self-diagnostic controller configured to test and evaluate processes performed therein and communicates data and status via said communication interface.

84. The vehicle of

claim 83

, wherein at least two of said control modules are adapted to control road wheel steering of said vehicle.

85. The vehicle of

claim 83

, wherein at least two of said control modules are adapted to control braking of said vehicle.

86. The vehicle of

claim 83

, wherein at least two of said control modules are adapted to control hand wheel steering of said vehicle.

87. The vehicle of

claim 83

, wherein said communication interface comprises at least two communication networks, wherein each network comprises at least two channels.

88. The vehicle of

claim 87

, wherein said first communication network is coupled to at least two control modules of said plurality of control modules allocated to road wheel steering functionality.

89. The vehicle of

claim 88

, wherein said first communication network is coupled to at least two control modules of said plurality of control modules allocated to hand wheel steering functionality.

90. The vehicle of

claim 89

, wherein said first communication network is coupled to a control module of said plurality of control modules allocated to supervisory functionality.

91. The vehicle of

claim 90

, wherein said second communication network is coupled to at least two control modules of said plurality of control modules allocated to front wheel braking functionality.

92. The vehicle of

claim 91

, wherein said second communication network is coupled to at least two control modules of said plurality of control modules allocated to rear wheel braking functionality.

93. The vehicle of

claim 92

, wherein said second communication network is coupled to a control module of said plurality of control modules allocated to supervisory functionality.

94. The vehicle of

claim 93

, wherein said first communication network and said second communication network are coupled to a control module of said plurality of control modules allocated to supervisory functionality.

95. The vehicle of

claim 94

, wherein said first communication network and said second communication network are coupled to at least two control modules of said plurality of control modules allocated to hand wheel steering and rear braking functionality.

96. The vehicle of

claim 95

, wherein a parameter of said system comprises characteristics, dynamics conditions, and states of any element of said system.

97. The vehicle of

claim 96

, wherein each control module of said plurality of control modules is interfaced to at least one independent power source of said plurality of independent power sources.

98. The vehicle of

claim 97

, wherein each control module of said plurality of control modules allocated to braking is interfaced to at least two independent power sources of said plurality of independent power sources.

99. The vehicle of

claim 98

, wherein each control module of said plurality of control modules allocated to supervisory functions is interfaced to each independent power sources of said plurality of independent power sources.

100. The vehicle of

claim 99

, wherein each control module of said plurality of control modules allocated to a particular control function of said vehicle is interfaced to an independent power source of said plurality of independent power sources.

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