Study on control strategy of a dual-motor drive system in electric vehicle

To realize good dynamic performance and driving stability of electric vehicle, the control strategy of differential speed and torque distribution between axles for a dual-motor drive system were presented in this paper. Based on the mathematical models of vehicle and tires, the simulation model of the dual-motor drive system was built with Simulink. To achieve the differential speed between axles, a self-adaptive control strategy of differential speed was put forward based on the torque control. Also, a control strategy of torque distribution was put forward based on the axial load ratio to realize the torque distribution between axles. The simulation results indicate that when the front and rear axles were driven separately, it can not slip between the axles; and when the drive torques of front and rear axles were distributed by axial load ratio, vehicle could realize the maximum dynamic performance. The study results will provide the theoretical basis for the integrated control of dynamics for dual-motor drive vehicles.