Control strategy of emergency steering return of distributed drive electric vehicle based on driver´s intention

In distributed drive electric vehicle (DDEV), electric motors are connected to each wheel separately, the drive/brake torque of each wheel can be independently and precisely controlled. According to this characteristic, a control strategy of emergency steering return based on driver´s intention is developed. Firstly, a steering return recognition model is designed to discriminate the driver´s intention of emergency steering return; then a yaw moment model is established to calculate the required yaw moment. Also, the corresponding allocation algorithm is designed. Finally, joint simulations in CarSim & Simulink are conducted. The results indicate that in emergency steering return maneuvers, the vehicle stability characteristic is improved remarkably and also the driver´s steering load is lowered, the pass ability of the vehicle is enhanced. The proposed algorithm is effective to keep the vehicle stability.