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A vehicle coasting deceleration control system has a motor/generator arranged in a drive-train of a vehicle. A controller is configured to determine a driver demand regarding deceleration of the vehicle at a time of coasting accompanied by an accelerator releasing operation. The controller is furthe

A vehicle coasting deceleration control system has a motor/generator arranged in a drive-train of a vehicle. A controller is configured to determine a driver demand regarding deceleration of the vehicle at a time of coasting accompanied by an accelerator releasing operation. The controller is further configured to control the motor/generator to decelerate the vehicle according to the determined driver demand regarding deceleration.

대표청구항 ▼

What is claimed is: 1. A vehicle coasting deceleration control system comprising: a motor/generator arranged in a drive-train of a vehicle, and a controller configured to determine a driver demand for deceleration of the vehicle at a time of coasting accompanied by an accelerator releasing operatio

What is claimed is: 1. A vehicle coasting deceleration control system comprising: a motor/generator arranged in a drive-train of a vehicle, and a controller configured to determine a driver demand for deceleration of the vehicle at a time of coasting accompanied by an accelerator releasing operation, the controller further configured to control the motor/generator to decelerate the vehicle responsive to the driver demand; and a program executable on the coasting deceleration control device for performing: a target coasting deceleration computing process for determining a driver demand regarding a level of deceleration at a time of coasting accompanied by an accelerator releasing operation, wherein the target coasting deceleration computing process calculates a target coasting deceleration, wherein the target coasting deceleration increases as the driver demand regarding a level of performing deceleration is stronger, and the target coasting deceleration computing process comprises: a coasting deceleration correction factor calculating process for calculating a coasting deceleration correction factor based on a parameter indicating driver demand for an amount of deceleration, and a target driving force calculating process for calculating a target driving force at the time of coasting by multiplying the coasting deceleration correction factor by a target driving force at the a time of accelerator release, wherein the driver demand is determined by the time period between a releasing of an accelerator by the driver and an applying of brakes of the vehicle by the driver. 2. The vehicle coasting deceleration control system of claim 1, wherein a target coasting deceleration is calculated to be larger as a level of the driver demand is stronger, and the controller is further configured to control the motor/generator to decelerate the vehicle based on the target coasting deceleration. 3. The vehicle coasting deceleration control system of claim 2, further comprising: a transmission arranged in a drive-train of the vehicle, and wherein the controller is further configured to control a transmission gear ratio and the motor/generator to decelerate the vehicle responsive to the target coasting deceleration. 4. A coasting deceleration control device for use in a vehicle of a type operated by a driver and having a driving system including an engine with an engine operating speed, a transmission having a variable gear ratio, and a motor/generator having adjustable torque in the driving system, the coasting deceleration control device comprising: a sensor for sensing a releasing of an accelerator by the driver; a controller operatively configured in the driving system with executable steps for: computing a driver demand for deceleration based upon the time between the sensing of a releasing of the accelerator by the driver and a sensing of an application of brakes of the vehicle by the driver, computing a target coasting deceleration based upon the computed driver demand for deceleration, wherein computing the target coasting deceleration comprises: a coasting deceleration correction factor calculating process for calculating a coasting deceleration correction factor based on a parameter indicating driver demand for an amount of deceleration, and a target driving force calculating process for calculating a target driving force at the time of coasting by multiplying the coasting deceleration correction factor by a target driving force at the a time of accelerator release, and controlling the variable gear ratio of the transmission and the adjustable torque of the motor/generator in response to the computing of the target coasting deceleration so that the vehicle obtains the computed target coasting deceleration. 5. A coasting deceleration control device for use in a driver operated vehicle having a driving system including an engine having an engine operating speed, a transmission having a variable gear ratio, and a motor/generator having adjustable torque in the driving system, the coasting deceleration control device comprising: a program executable on the coasting deceleration control device for computing: a driver demand for deceleration based upon the time between sensing a releasing of an accelerator by the driver and sensing an application of brakes of the vehicle by the driver, and a target coasting deceleration based upon the driver demand for deceleration that is detected, wherein computing the target coasting deceleration comprises: a coasting deceleration correction factor calculating process for calculating a coasting deceleration correction factor based on a parameter indicating driver demand for an amount of deceleration, and a target driving force calculating process for calculating a target driving force at the time of coasting by multiplying the coasting deceleration correction factor by a target driving force at the a time of accelerator release, and a driving system controller responsive to the program computed target coasting deceleration for selecting a gear ratio of the transmission, for adjusting the torque of the motor/generator, or for adjusting both the gear ratio of the transmission and the torque of the motor/generator so that the vehicle obtains the computed target coasting deceleration. 6. The coasting deceleration control device of claim 5, wherein; computing the driver demand for deceleration comprises: increasing a computed level of driver demand in response to shorter time periods between the releasing of the accelerator and the applying of the brakes, and computing the target coasting deceleration comprises computing the target coasting deceleration based upon the computed level of driver demand, such that increased computed level of driver demand results in computing an increased target coasting deceleration. 7. The coasting deceleration control device of claim 6, wherein the target coasting deceleration is repeatedly computed by the program based upon repeatedly sensing an engine speed and the transmission gear ratio during a time of coasting, repeatedly sensing accelerator release, breaking application, braking release, accelerator application and time periods between them, repeatedly computing the driver level of demand for deceleration; and the driving system controller is responsive to the repeatedly computed target coasting deceleration for repeatedly selecting the gear ratio of the transmission and for repeatedly adjusting the torque of the motor/generator so that the vehicle obtains the repeatedly computed target coasting deceleration. 8. A coasting deceleration control device for a vehicle having a driving system including a motor/generator and a transmission, comprising: a program executable on the coasting deceleration control device for performing: a target coasting deceleration computing process for determining a driver demand regarding a level of deceleration at a time of coasting accompanied by an accelerator releasing operation, wherein the target coasting deceleration computing process calculates a target coasting deceleration, wherein the target coasting deceleration increases as the driver demand regarding a level of performing deceleration is stronger, and the target coasting deceleration computing process comprises: a coasting deceleration correction factor calculating process for calculating a coasting deceleration correction factor based on a parameter indicating driver demand for an amount of deceleration, and a target driving force calculating process for calculating a target driving force at the time of coasting by multiplying the coasting deceleration correction factor by a target driving force at the a time of accelerator release; and a coasting deceleration control process for adjusting the target coasting deceleration calculated by the target coasting deceleration computing process by controlling a torque of the motor/generator, wherein the driver demand is determined by the time period between a releasing of an accelerator by the driver and an applying of brakes of the vehicle by the driver. 9. The coasting deceleration control device of claim 8, wherein the target coasting deceleration computing process comprises a target driving force calculating process for calculating a target driving force at the time of coasting based on the driver demand for deceleration and the target driving force when the accelerator is released, the coasting deceleration control process comprises a motor/generator torque calculating process for calculating a motor/generator torque based on the target driving force at the time of coasting and a gear ratio of the transmission, and the coasting deceleration control process further comprises a motor/generator output process for deriving the motor/generator demand torque and outputting a motor/generator torque command corresponding to the derived motor/generator demand torque to the motor/generator. 10. The coasting deceleration control device of claim 9, wherein: when a time elapsed after accelerator release until brake depression is less than a predetermined time, a coasting deceleration correction factor calculating process determines that the driver demand is to decelerate very quickly, and increases the coasting deceleration correction factor as the time elapsed after accelerator release until brake depression is shorter. 11. The coasting deceleration control device of claim 10, wherein the coasting deceleration correction factor calculating process detects a brake depressing force and increases the coasting deceleration correction factor as the brake depressing force increases. 12. The coasting deceleration control device of claim 10, wherein the coasting deceleration correction factor calculating process decreases the coasting deceleration correction factor when the brake is released after the brake depression and an accelerator opening exceeds a predetermined degree of opening. 13. The coasting deceleration control device of claim 9, wherein when a time elapsed after accelerator release until accelerator re-depression is less than a predetermined time, the coasting deceleration correction factor calculating process determines that driver demand is to decelerate slowly, and decreases the coasting deceleration correction factor as the time decreases. 14. The coasting deceleration control device of claim 13, wherein the coasting deceleration correction factor calculating process detects an accelerator opening at the time of accelerator re-depression and decreases the coasting deceleration correction factor as the accelerator opening increases. 15. The coasting deceleration control device of claim 9, wherein when an accelerator opening speed exceeds a reference value and the vehicle is in a state of acceleration, the coasting deceleration correction factor calculating process determines that the driver demand is to decelerate quickly, and increases the coasting deceleration correction factor as the accelerator opening speed increases. 16. The coasting deceleration control device of claim 8, wherein the coasting deceleration control process comprises: a motor/generator torque calculating process for calculating a torque of the motor/generator based on the target driving force at the time of coasting and a gear ratio of the transmission, and a motor/generator output process for deriving the motor/generator torque and outputting a motor/generator torque command corresponding to the derived motor/generator torque to the motor/generator. 17. A hybrid vehicle equipped with a hybrid driving system comprising: an engine, a first clutch, a motor/generator, a transmission, and driving wheels, comprising the coasting deceleration control device of claim 8, wherein the vehicle has multiple driving modes, the multiple driving modes comprising: a HEV mode in which the first clutch is engaged and the engine and the motor/generator provide a driving force, and an EV mode in which the first clutch is released and the motor/generator provides the driving force. 18. The coasting deceleration control device of claim 17, wherein the transmission comprises a continuously variable transmission, and the coasting deceleration control process comprises: a motor/generator torque calculating process for calculating a motor/generator torque based on a target driving force at the time of coasting, and a gear ratio of the transmission; a motor/generator output process for outputting a motor/generator torque command corresponding to a motor/generator torque limit value to the motor/generator when the motor/generator torque exceeds the motor/generator torque limit value; and a continuously variable transmission output process for calculating a transmission gear ratio for compensating a shortage of a driving force corresponding to a difference between the motor/generator torque and the motor/generator torque limit value, the continuously variable transmission output process further being configured to output a command to the continuously variable transmission for setting a transmission input RPM to achieve the calculated transmission gear ratio as a target RPM. 19. The deceleration control device of claim 8, for a driver operated vehicle having a driving system further including an engine having an engine operating speed, the transmission having a variable gear ratio, and the motor/generator having adjustable torque in the driving system, the deceleration control device further comprising: the program executable on the deceleration control device for computing the target coasting deceleration also based upon the determined driver demand for deceleration, and the driving system controller responsive to the program computed target coasting deceleration for both selecting the gear ratio of the transmission and for adjusting the torque of the motor/generator so that the vehicle obtains the computed target deceleration. 20. A coasting deceleration control device for a driver operated vehicle having a driving system including a motor/generator and a transmission, comprising: a means for determining a driver deceleration demand at a time of coasting accompanied by an accelerator releasing operation; a means for calculating a target coasting deceleration based upon the determined driver deceleration demand, wherein the calculated target coasting deceleration increases as the driver demand for deceleration is stronger, and wherein computing the target coasting deceleration comprises: a coasting deceleration correction factor calculating process for calculating a coasting deceleration correction factor based on a parameter indicating driver demand for an amount of deceleration, and a target driving force calculating process for calculating a target driving force at the time of coasting by multiplying the coasting deceleration correction factor by a target driving force at the a time of accelerator release; and a coasting deceleration control means for adjusting deceleration by controlling torque of the motor/generator to obtain the target coasting deceleration calculated by the target coasting deceleration computing process, wherein the driver deceleration demand is determined by the time period between a releasing of an accelerator by the driver and an applying of brakes of the vehicle by the driver. 21. A coasting deceleration control process for use in a vehicle having a driving system including an engine having an engine operating speed, a transmission having a variable gear ratio, and a motor/generator having adjustable torque in the driving system, the deceleration control device comprising: sensing a releasing of the accelerator by the driver; computing a driver demand for deceleration based upon the sensing of a releasing of the accelerator by the driver, computing a target coasting deceleration based upon the driver demand for deceleration that is computed, wherein computing the target coasting deceleration comprises: a coasting deceleration correction factor calculating process for calculating a coasting deceleration correction factor based on a parameter indicating driver demand for an amount of deceleration, and a target driving force calculating process for calculating a target driving force at the time of coasting by multiplying the coasting deceleration correction factor by a target driving force at the a time of accelerator release, and controlling the gear ratio of the transmission and the torque of the motor/generator in response to the computing of the target coasting deceleration so that the vehicle may obtains the computed target deceleration, wherein the driver demand is determined by the time period between a releasing of an accelerator by the driver and an applying of brakes of the vehicle by the driver.