Method of controlling electric motor torque in an electric vehicle

摘要

The method involves receiving throttle torque and brake torque requests and sensing the speed of the vehicle, with the brake torque request being split into a creep cancellation component and a brake regenerative component. The throttle torque request is adjusted based on the creep cancellation and brake regenerative components to produce a torque sum, upon which the control of the electric motor torque is based. The brake torque request is split by multiplying the brake torque request by a splitting factor generated by a splitter map based upon vehicle speed to produce the brake regenerative component. An absolute value of the brake regenerative component is subtracted from the brake torque request to produce a first creep gain signal that is multiplied by a gain factor to produce a second creep cancel signal. A creep torque portion of the throttle torque command is determined and the lesser of the creep torque portion and the second creep cancel signal is selected to produce the creep cancellation component. The creep cancellation component is subtracted from the throttle torque request to produce a creep-adjusted torque and the brake regenerative component is subtracted from the creep-adjusted torque to produce the torque sum.