Anti-slip regulation method for electric vehicles with four in-wheel motors based on the identification of slip ratio

In order to improve the stability and acceleration of electric vehicles with four in-wheel motors under various road conditions, an anti-slip regulation method considering the identification of slip ratio is proposed. In this paper, the model of the whole vehicle is built and the road identifier based on the tire model which established by Burckhardt is designed. Then, an anti-slip controller that utilizes the variable universe fuzzy PID algorithm is established to adjust the driving torques of the four in-wheel motors according to the road conditions. The simulation results show that the designed control strategy can quickly and accurately identify the optimal slip ratio under each typical road condition, and make the tire slip ratio approach the optimal slip ratio in a short time, so as to effectively improve the driving stability and dynamic performance of the vehicle.