High speed stability electromechanical coupling control for dual-motor distributed drive electric vehicle

Abstract

The advantage of the designed dual-motor anti-slip differential drive system is taken to improve the dynamics performance of the distributed drive electric vehicle. On the basis of the early research on the coaxial coupling traction control theory, the high speed stability electromechanical coupling control strategy for the vehicle is carried out. A 14 degrees of freedom space dynamics model for the driver-vehicle system of the distributed drive vehicle is established and verified, in which the model of the designed drive system is included. The yaw rate and the sideslip angle are taken as the control variables, and a dynamic stability controller is designed based on a specific fuzzy rules. The vehicle instability judgment condition is developed and the control system parameters are identified. The vehicle high speed stability control in the ultimate working conditions is achieved based on the direct yaw-moment generated by the electromechanical coupling controller. The results show that the electromechanical coupling controller not only can play a role in enhancing the vehicle high speed stability by implementing the dynamic coupling of the dual-motor distributed drive systems, but also can coordinate the torque output from both of the drive systems, so the fluctuation of the driving torque is inhibit, and the work intensity of the motors and the controller is reduced.