CROSS-REFERENCE TO RELATED APPLICATIONThis application is a continuation of U.S. patent application Ser. No. 13/721,510, filed Dec. 20, 2012, the disclosure of which is incorporated by reference herein in its entirety.
BACKGROUNDThe present invention relates generally to a vehicle powertrain control system, and more particularly, a location-based vehicle control system that regulates powertrain operation based on powertrain operating parameters.
As more vehicles located in urbanized areas of the word compete for increasingly scarce resources (e.g., highways, fuel, and pollution quotas), municipalities have an interest and opportunity to encourage driving behavior that is both environmentally and socially conscientious. Municipalities currently monitor traffic patterns and congestion to obtain an indicator for influencing driver behavior. For example, municipalities may increase toll rates in certain areas and at certain times of day based on traffic volume to facilitate a different use of the limited transportation resources.
To date, only manual solutions are available for mitigating the environmentally and socially conscientious consequences caused by the limited transportation resources. For example, highway congestion and pollution have been addressed by adding high-occupancy vehicle (HOV) lanes to at high-traffic urban highways. Further, the flow of traffic traversing the HOV lanes can be controlled based on the time of day. However, manual solutions have been traditionally implemented regardless of the operating parameters of the engine. Conventional powertrain systems, therefore, do not apply municipality location-based policies according to vehicle powertrain operating parameters.
SUMMARYAccording to one embodiment, a vehicle control system to control operation of a vehicle includes a powertrain system operable according to a plurality of operating modes that drive the vehicle. A sensor is mounted to the vehicle to detect a quality of air surrounding the vehicle. A vehicle control module is configured to select an operating mode of the powertrain system. The operating mode is selected to reduce at least one emission exhausted from the vehicle that contributes to a low air quality measure by the sensor.
According to another embodiment, a powertrain system comprises a global position satellite (GPS) system and a control module. The GPS system determines a location of a vehicle operated by the powertrain system. The control module communicates with a remotely located municipality module to obtain at least one stored powertrain parameter. The control module is configured to determine at least one current operating condition of the powertrain system. The control module further selects an operating mode of the powertrain system among a plurality of operating modes based on a comparison between the at least one current operating condition and the at least one stored powertrain parameter.
In yet another embodiment, a method of controlling a vehicle powertrain system comprises storing at least one powertrain parameter in a data base, and determining at least one operating condition of the powertrain system. The method further includes determining a location of a vehicle operated by the powertrain system, and comparing the at least one operating condition to the at least one powertrain parameter. The method further includes selecting an operating mode of the powertrain system among a plurality of operating modes that control the powertrain system based on the comparison.
Additional features are realized through the techniques of the present invention. Other embodiments are described in detail herein and are considered a part of the claimed invention. For a better understanding of the invention and the features, refer to the description and to the drawings.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGSThe subject matter which is regarded as the invention is particularly pointed out and distinctly claimed in the claims at the conclusion of the specification. The forgoing and other features are apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a block diagram illustrating a location-based powertrain control system according to an embodiment;
FIG. 2 is a flow diagram illustrating a method of controlling modes of a powertrain control system according to an embodiment; and
FIG. 3 is a flow diagram illustrating a method of controlling modes of a powertrain control system according to another embodiment.
DETAILED DESCRIPTIONReferring now toFIG. 1, a location-basedpowertrain control system100 is illustrated. The location-basedpowertrain control system100 includes apowertrain system102 of a vehicle. The vehicle according to an embodiment includes, for example, a plug-in hybrid electric vehicle (PHEV). Thepowertrain system102 includes two on-board power systems. The power systems include, for example, anengine104 and a hybrid electric motor/generator (HEM)106. Theengine104, such as an internal combustion engine (ICE), for example, generates a first mechanical power by combusting hydrocarbon fuel, such as gasoline, stored in afuel tank108. The first mechanical power is transferred to adrive shaft112. Thedrive shaft112 rotates in response to the first mechanical power, which ultimately rotates thewheels114 of the vehicle.
The HEM106 converts electrical power stored in arechargeable battery unit116 into a second mechanical power. The second mechanical power may also be transferred to thedrive shaft112 to ultimately rotate thewheels114. In one embodiment, the HEM106 is a synchronous motor/generator, in which a permanent magnet is embedded in a rotor and a stator coil is wound around a stator. The HEM106 is controlled by being selectively energized with three-phase alternating current delivered from an inverter (not shown). The inverter may selectively supply the electrical power from thebattery unit116 based on one or more HEM control signals, thereby adjusting the operation and mechanical output of theHEM106.
Further, the rotor may act as an electricity generator that produces a generating power on both ends of the stator coil so as to recharge thebattery unit116. In addition to recharging thebattery unit116 using the rotor of theHEM106, thebattery unit116 may be recharged according to other charging actions including, but not limited to, mechanical power transferred from theengine104, regenerative braking, and connection to an external power supply.
Thepowertrain control system100 further includes apowertrain control module118 and adrive clutch120. Thepowertrain control module118 may receive operating parameters viasensors117 incorporated with theengine104, the HEM106 and/or thebattery unit116. For example, asensor117 included with theengine104 may output engine speed data, fuel intake data, piston timing, engine temperature. Thesensor117 may also detect carbon levels exhausted from the engine in response to combusting the fuel. In another example,sensors117 may be implemented with theHEM106 and thebattery unit116 to indicate battery charge levels, voltage and/or current levels realized by theHEM106, motor temperature, and motor speed.
Thepowertrain control module118 may operate as an engine negotiator component. That is, the powertrain control module118 may output one or more control signals that adjust operation of theengine104 and the HEM106. For example, thepowertrain control module118 may output one or more engine control signals to theengine104, and one or more HEM control signals to the HEM106. An engine control signal may, for example, adjust fuel intake into cylinder chambers of the engine and/or piston timing to vary fuel combustion timing. A HEM control signal may vary power realized by theHEM106, which adjusts mechanical power output. For example, the HEM control signal may vary the amount of power converted by the inverter, which reduces motor speed generated by the HEM106. Accordingly, the second mechanical power realized by thedrive shaft112 may be adjusted.
Thepowertrain control module118 may also output a clutch control signal that controls thedrive clutch120. In at least one embodiment, thedrive clutch120 is interposed between theengine104 and the HEM106 to adjust a torque transfer capacity between theengine104 and the HEM106. Thedrive clutch120, therefore, may selectively engage/disengage thedrive shaft112 to theengine104 and/or theHEM106 based on the clutch control signal. Accordingly, thepowertrain system102 may selectively operate in a plurality of operating modes to drive the PHEV according to theengine104, or theHEM106, or theengine104 and theHEM106 simultaneously.
The plurality of powertrain operating modes includes, but is not limited to, an engine-only mode, a charge-depleting mode, a blended mode, a charge-sustaining mode, and a mixed mode. When thepowertrain control module118 initiates the engine-operating mode, thedrive clutch120 engages theengine104 to thedrive shaft112, while disengaging theHEM106 from thedrive shaft112. Accordingly, the PHEV is driven solely by the first mechanical power generated by theengine104.
When thepowertrain control module118 initiates the charge-depleting mode, the PHEV is driven essentially by theHEM106. More specifically, the charge-depleting mode disengages theengine104, and engages theHEM106 to thedrive shaft112. The second mechanical power from theHEM106 drives the PHEV until the electrical charge of thebattery unit116 is depleted below a threshold value (BATTTH). In one embodiment, theengine104 may be engaged during hard accelerations, i.e., when the acceleration of the PHEV exceeds a threshold value. Theengine104 may then again be disengaged when the PHEV reaches a steady driving state, i.e., the acceleration is maintained within the threshold range. Once the battery charge falls below BATTTH, thepowertrain control module118 initiates the engine-only mode. Accordingly, thedrive clutch120 disengages theHEM106 and engages theengine104 to drive the PHEV until the battery is recharged above BATTTH.
When thepowertrain control module118 initiates the blended mode, thedrive clutch120 engages both theengine104 and theHEM106 simultaneously such thatdrive shaft112 receives both the first and second mechanical power. Since thedrive shaft112 receives both the first and second mechanical power, the PHEV may achieve greater speeds and/or greater torque then would be realized if only theHEM106 were engaged. For example, if vehicle speed resulting from the second mechanical power of theHEM106 is too low, the blended mode may be initiated to engage theengine104 such that the combined mechanical power from theHEM106 andengine104 achieves the desired vehicle speed.
When thepowertrain control module118 initiates the charge-sustaining mode, both theengine104 and theHEM106 may continuously be engaged/disengaged in such a manner that thepowertrain system102 is operated as efficiently as possible based on a battery charge level range. For example, when the charge level exists within a range having a low battery level (BATTLOW) and a high battery level (BATTHIGH), thepowertrain control module118 may instruct thedrive clutch120 to engage both theengine104 and theHEM106. If the battery charge falls below BATTLOW, thepowertrain control module118 may instruct thedrive clutch120 to disengage theHEM106 such that thedrive shaft112 is driven solely by the first mechanical power generated by theengine104. While driving the PHEV exclusively by theengine104, thebattery unit116 may be recharged by theengine104, regenerative breaking, and/or an external power source. If thebattery unit116 is recharged such that the charge again exists within in the battery range, theHEM106 may again be engaged to provide the second mechanical power to thedrive shaft112. If thebattery unit116 is recharged such that the charge exceeds BATTHIGH, then thepowertrain control module118 may instruct thedrive clutch120 to disengage theengine104 and drive the PHEV exclusively by theHEM106 until the battery is charged to level that exists within the range of BATTLOWand BATTHIGH.
When the mixed mode is initiated by thepowertrain control module118, a combination of the above modes may be utilized during an entire trip duration. For example, the PHEV may embark on trip starting in the charge-depleting mode and using theHEM106 to exclusively drive 5 miles (8 km) at a low speed. The PHEV may then enter a freeway and operate in a blended mode for 20 miles (32 km), using 10 miles (16 km) worth of all-electric range at twice the fuel economy. Finally, the PHEV exits the freeway and drives for another 5 miles (8 km) without engaging theengine104 until the full 20 miles (32 km) of all-electric range of thebattery unit116 is exhausted. At this point the PHEV can revert back to a charge-sustaining mode for another 10 miles (16 km) until the final destination is reached. Such a trip would be considered a mixed mode, as multiple modes of thepowertrain system102 are employed during the duration of the trip. The mixed-mode contrasts with a charge-depleting trip which would be driven within the limits of a PHEV's all-electric range. Conversely, the portion of a trip which extends beyond the all-electric range of a PHEV would be driven primarily in charge-sustaining mode.
Thepowertrain control module118 may also include acommunication module122 and alocation module124. Thecommunication module122 has an antenna that electrically communicates, for example wirelessly, with a remotely locatedmunicipality module126 that is operated by a city municipality. Themunicipality module126 may include a storage device (not shown) that stores one or more regulated powertrain parameters as set by the municipality. For example, themunicipality module126 may store a lookup table (LUT) that cross-references one or more regulated powertrain parameters including, but not limited to, carbon emission level output desired by the municipality, with a corresponding powertrain mode of thepowertrain system102.
Themunicipality module126 may also include a microcontroller (not shown) configured to predict various pollution events, such as smog levels and o-zone levels, based on current environmental conditions. Accordingly, the LUT may cross-reference one or more environmental parameters, such as atmospheric conditions including o-zone levels, smog levels and carbon levels, with a corresponding powertrain mode of thepowertrain system102.
Themunicipality module126 may also store various types of vehicle information including, but not limited to, vehicle types, models, ages. The vehicle information may be cross-referenced in the LUT with regulated powertrain parameters as a function of secondary conditions. The secondary condition may include, for example, time of day, road conditions, weather, weather forecasts, traffic conditions, vehicle congestion, holidays, days of the week, elevation, incline of the vehicle, weight of the vehicle, current fuel prices, and state of emergencies. Based on the vehicle information, themunicipality module126 may determine various operating conditions of a powertrain system corresponding to a particular vehicle.
Thepowertrain control module118 may determine that the PHEV is located in a municipality jurisdiction including amunicipality module126 based on the location information provided by thelocation module124. For example, the location information may include global position satellite (GPS) coordinates of the vehicle. Based on the GPS information, thepowertrain control module118 may determine that the PHEV is located in a municipality jurisdiction including amunicipality module126, and then initiate communication with themunicipality module126. In another embodiment, themunicipality module126 may also include acommunication module128 having an antenna. Accordingly, thepowertrain control module118 and/or themunicipality module126 may electrically detect the presence of one another when the PHEV enters the municipality jurisdiction. Themunicipality module126 may query thepowertrain control module118 for one or more powertrain parameters, such as carbon emissions output by theengine104, in response to detecting the presence of the PHEV.
The communication between thepowertrain control module118 and themunicipality module126 allows municipalities to directly address environmentally and socially conscientious consequences caused by limited transportation resources. More specifically, thepowertrain control module118 may output powertrain operating parameters to themunicipality module126. Themunicipality module126 may then compare the powertrain operating parameters with the regulated parameters stored in the LUT. If the powertrain operating parameters are not consistent with the regulated parameters set by the municipality, themunicipality module126 may output a regulation signal instructing thepowertrain control module118 to initiate a different powertrain mode of thepowertrain system102.
Suppose, for example, that a PHEV operating in an engine-only mode enters a municipality jurisdiction including themunicipality module126. Thepowertrain control module118 determines the existence of themunicipality module126 based on GPS coordinates determined by thelocation module124 and communicates powertrain operating parameters, such as carbon levels exhausted by theengine104, to themunicipality module126. If the exhausted carbon levels exceed the regulated carbon levels stored in the LUT of themunicipality module126, themunicipality module126 may output a regulation signal instructing thepowertrain control module118 to switch the powertrain system mode from the engine-only mode to the charge-depleting mode. In response to the regulation signal, thepowertrain control118 module initiates the charge-depleting mode and controls the drive clutch to disengage theengine104 and engage theHEM106. As a result, the PHEV is driven exclusively by theHEM106 and the level of carbon emission produced by the PHEV is reduced.
In at least one embodiment, thepowertrain control module118 performs the comparison between stored powertrain parameters and current powertrain operating parameters as opposed to themunicipality module126. The current powertrain operating parameters may include emissions exhausted from the vehicle and/or a quality of outside air local to the vehicle. If the current operating parameters do not comply with the stored parameters obtained from themunicipality module126, thepowertrain control module118 may select a different powertrain mode as discussed above.
Thepowertrain control module118 may also control the powertrain operating mode based current operating parameters including, but not limited to, emissions exhausted from the vehicle and/or a quality of outside air local to the vehicle. According to at least one embodiment, thepowertrain system102 may further include one or more on-boardair quality sensors130 mounted at various locations of the vehicle. Theair quality sensor130 may be in electrical communication with the powertrain control module to sense the quality of air surrounding the vehicle and output a signal indicative of the air quality to thepowertrain control module118. The quality of air may be based on at least one of the o-zone of the surrounding atmosphere and/or the level of carbon emissions existing in the surrounding atmosphere. It is appreciated that the surrounding atmosphere ranges, for example, from the ground supporting the vehicle to about 17 kilometers (i.e., 56,000 ft) above the ground.
Thepowertrain control module118 may compare the air quality to a predetermined threshold value. The threshold value may be stored at various locations including, but not limited to, a storage unit included in the powertrain control module, the municipality data base, and a cloud server in electrical communication with the powertrain control module. If the air quality is below the threshold value, thepowertrain control module118 may initiate a different operating mode of the powertrain system, which improves reduces at least one emission from the vehicle to improve the surrounding quality of air. For example, if the air quality is below the threshold value and thepowertrain system102 is operating in the engine-only mode, thepowertrain control module118 may output a clutch control signal that initiates the battery-depletion mode. Accordingly, theengine104 is disengaged, and the vehicle is driven by only theHEM106 such that the selected mode reduces at least one emission from the vehicle contributing to a low air quality measure by theair quality sensor130.
In another embodiment, one or more risk factors may be considered before changing the powertrain mode of thepowertrain system102. The risk factors include, but are not limited to, risk factors associated with the PHEV, the driver of the PHEV, road conditions, weather, and a distance at which the PHEV is from a battery charging stations. For example, thepowertrain control module118 may output carbon emission levels exhausted from theengine104 along with a battery charge level of thebattery unit116. If the battery charge exceeds a predetermined threshold value, themunicipality module126 may determine that there is no risk of the PHEV becoming disabled, and may consider whether the powertrain mode should be changed based on the carbon emissions level currently output by the engine. However, if the battery charge is below the predetermined threshold, themunicipality module126 may determine that disengaging theengine104 poses a risk of disabling the PHEV. Accordingly, themunicipality module126 may select a powertrain module that utilizes both theengine104 and theHEM106, or allows the powertrain system of the PHEV to remain operating in the engine-only mode until the battery charge level is recharged to an acceptable level.
The driver of the vehicle may also manually indicate a risk level, which is output to themunicipality module126. For example, a driver may manually indicate a health emergency, which is communicated by thepowertrain control module118 to themunicipality module126. Based on the health emergency, themunicipality module126 may allow thepowertrain system102 of the PHEV to operate in a powertrain mode selected by the driver.
In another embodiment, themunicipality module126 may implement quotas corresponding to engine pollutants per unit of time, thereby allowing the sum of all vehicle driving modes to impact the environment over a specific amount of time. After such quotas have been met, the municipality may enforce more stringent powertrain operating regulations, such as automatically switching thepowertrain system102 out of an engine-only powertrain mode, to mitigate common pollution events such as smog alerts and/or o-zone alerts.
Thepowertrain control module118 may alert the driver to a powertrain operating mode change request, and may receive one or more feedback inputs from the driver. That is, a driver may be presented with incentives to switch powertrain modes. For example, a positive incentive, such as a carbon tax credit, an automotive insurance discount, etc., may be provided to the driver in exchange for switching out of an engine-only powertrain mode. Alternatively, the driver may be presented with a toll or carbon tax/fee in exchange for allowing the driver to operate the vehicle in an engine-only powertrain mode during an environmental event, such as a smog-alert.
Thepowertrain control module118 may wirelessly communicate the driver input to themunicipality module126. For example, the driver may be alerted of a request from the municipality to change powertrain mode using a sound and/or an icon displayed on a dashboard (not shown) of the PHEV. The driver may then choose to select the suggested powertrain mode, or may deny the request. The selection of the driver may then be wirelessly communicated to themunicipality module126. In one embodiment, if the driver chooses to deny the suggested powertrain mode, the municipality may assess a toll, i.e., fee, in exchange for allowing the user to maintain the current powertrain mode.
The dashboard may also display information, such as a summary of statistics, indicating powertrain mode changes in other drivers. For example, the dashboard may display and/or announce, “You are currently among150 other drivers of which the municipality has adjusted powertrain parameters. Thank you for your cooperation.” The summary of statistics may also be emailed, text, and/or communicated to a mobile device via a mobile application downloaded onto the driver's mobile device.
Referring now toFIG. 2, a flow diagram illustrates a method of controlling modes of a location-based powertrain control system according to an embodiment. Atoperation200, a location of a PHEV is determined. The location may be determined, for example, according to GPS coordinates. Based on the location of the PHEV, a determination as to whether the PHEV is located in a municipality-regulated location that regulates the powertrain operation of the PHEV is made atoperation202. If the PHEV is not located in a vehicle-regulated municipality, the current powertrain mode of the powertrain system is maintained atoperation204 and the location of the PHEV is again determined atoperation202.
If the PHEV is located in a vehicle-regulated municipality, however, the current operating parameters of the powertrain system, such as engine operating parameters, are determined by the municipality atoperation206. For example, carbon emission levels exhausted by the engine are communicated to a municipality module storing a carbon emissions threshold value. If the exhausted carbon emission levels are within the threshold value, the current powertrain mode of the PHEV is maintained atoperation208, and the exhausted carbon level continues to be monitored atoperation206. If the exhausted carbon level exceeds the threshold value, however, a safety risk is determined atoperation210. The safety risk may include, for example, the safety of the driver and/or and faulty operation of the vehicle such as a probability that the vehicle will be disabled. If a safety risk is determined, the current powertrain mode of the PHEV is maintained208, and the exhausted carbon level continues to be monitored atoperation206. The safety risk can then be assessed at subsequent time after the risk has been averted. Otherwise, a mitigating action is sent from the municipality to the PHEV atoperation212. The mitigating action may include, but is not limited to, requesting the driver to switch the powertrain mode, charging a fee to the driver of the PHEV to continue operating the PHEV in the current powertrain mode, and/or automatically changing the current powertrain mode to a different powertrain mode. The result of the mitigating action is communicated to the municipality atoperation214. For example, a result as to whether the powertrain mode is changed may be wirelessly communicated to a municipality module operated by a city municipality, and the method ends.
Referring toFIG. 3, a flow diagram illustrates another method of controlling modes of a location-based powertrain control system according to an embodiment. Atoperation300, a quality of air surrounding a vehicle including the powertrain control system is determined. The quality of air may be based on o-zone levels of the atmosphere, carbon levels of the atmosphere, etc. Atoperation302, the air quality is compared to a threshold value. If the air quality exceeds the threshold value, the current powertrain mode of the powertrain system is maintained atoperation304 and the air quality is again determined atoperation302. Otherwise, a determination as to whether one or more risk factors exist is performed atoperation306.
If no risk factors exist, then the operating mode of the powertrain system is changed to an operating mode that reduces at least one emission from the vehicle to improve the air quality atoperation308. For example, the operating mode may be changed from and engine-only mode to a battery depletion mode where only the HEM, i.e., motor/generator, is used to drive the vehicle such that at least one emission exhausted from the vehicle are reduced. However, if one or more risk factors exist, a determination is made as to whether the risk factors exceed a risk threshold atoperation310.
The risk factors may include, for example, safety of the driver, safety of the vehicle, road conditions, weather, distance from a charging station, etc. A mathematical formula may be derived by a vehicle control module to determine a current risk level based on the one or more existing risk factors. If the risk level exceeds the risk threshold, the current operating mode of the powertrain system may be maintained atoperation312. For example, if the driver has initiated the engine-only mode, and the risk level exceeds the risk threshold, the driver may be permitted to maintain the engine-only mode. However, if the risk level is less than the risk threshold, the operating mode of the powertrain system is changed to an operating mode that reduces at least one emission exhausted from the vehicle to improve the air quality atoperation308. The changed operating mode is communicated to the driver atoperation314, and the method ends. Accordingly, an operation mode of the powertrain system may be changed to a different mode such that at least one emission from the vehicle contributing to a low air quality is reduced.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one more other features, integers, steps, operations, element components, and/or groups thereof.
The flow diagrams depicted herein are just examples of various embodiments of the inventive concept. There may be many variations to the diagrams described therein without departing from the spirit of the invention. For instance, operations may be performed in a differing order or steps may be added, deleted or modified. All of these variations are considered a part of the claimed invention.
While various embodiments have been described, it will be understood that those skilled in the art, both now and in the future, may make various modifications which fall within the scope of the claims which follow. These claims should be construed to maintain the proper protection for the invention first described.