Optimum slip control strategy for distributed drive electric vehicles based on sliding mode control

The drive motors of the four wheels distributed drive type electric vehicles have the feature to be controlled independently. To minimize the difference of the slip ratio of the front and rear drive wheels, an optimum slip control strategy based on the sliding mode control is proposed. The transfer torque is derived as the control output. Through the drive toque transfer, the controller can keep the slip ratio of the drive wheels to be close. So the drive wheels will reach the cohesion limit simultaneously, thus it improves the traction ability and reduces the possibility of the ASR control mode coming into operation. The simulation model is built and the simulations results verify the effectiveness of the control strategy.