VEHICLE CONTROL METHOD AND SYSTEM
FIG9 is a graph representing a relationship between a pedal return speed coefficient and an accelerator pedal return speed, in this embodiment
Next, with reference to FIG9, the pedal return speed coefficient K4 will be described. The pedal return speed coefficient K4 is a coefficient to be set during return of the accelerator pedal (during decrease of the depression amount). Thus, when the depression speed is zero, or the accelerator pedal is being depressed (the depression amount is increasing), the pedal return speed coefficient K4 is set to 1. As depicted in FIG9, the pedal return speed coefficient K4 is set such that the value thereof increases along with an increase in a manipulation speed during return of the accelerator pedal (pedal return speed [mm/sec]). Specifically, generally, when the accelerator pedal depression speed is relatively large, the vehicle 1 is quickly decelerated, and the deceleration of the vehicle 1 becomes relatively large. In a state in which the deceleration of the vehicle 1 is relatively large, the load on the front road wheels is relatively large due to an inertial force acting on the vehicle 1. As a result, when the accelerator pedal return speed is relatively large, the suspension 3 of the front road wheels is relatively compressed. Therefore, when the accelerator pedal return speed is relatively large, the effect of improving the responsiveness and linear feeling of the behavior of the vehicle 1 under the same incremental torque is deteriorated. In order to correct such a deterioration in in the responsiveness and linear feeling improvement effect, the pedal return speed coefficient K4 is set such that the value thereof increases along with an increase in the pedal return speed. In the vehicle control system and method according to the above embodiment, the incremental torque is set to a larger value when the manipulation speed during return of the accelerator pedal is relatively large than when the manipulation speed during return of the accelerator pedal is relatively small (FIG9), so that it becomes possible to sufficiently improve the responsiveness and linear feeling of the vehicle behavior even when the manipulation speed during return of the accelerator pedal is relatively large.
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['1. A method of controlling a vehicle in which rear road wheels are driven by a prime mover, comprising: a mode selection step of selecting a first pedal mode in which an acceleration of the vehicle is set based on a depression amount of an accelerator pedal of the vehicle, or a second pedal mode in which the acceleration and a deceleration of the vehicle are set based on the depression amount of the accelerator pedal of the vehicle; a basic torque setting step of setting, based on a driving state of the vehicle, a basic torque to be generated by the prime mover; an incremental torque setting step of setting an incremental torque to allow the basic torque to be increased in accordance with an increase in steering angle of a steering device equipped in the vehicle; and a torque generation step of controlling the prime mover to generate a torque which is determined by adding the incremental torque to the basic torque, wherein the incremental torque setting step includes setting the incremental torque to different values between when the first pedal mode is selected in the mode selection step and when the second pedal mode is selected in the mode selection step.']