The Research of Double-Driven Electric Vehicle Stability Control System

An algorithm for direct yaw-moment control based on sliding-mode variable structure control theory is proposed in this paper to enhance the handling stability of an electric vehicle with two independent motors equipped at the rear axles. The controller is designed according to the two degrees-of-freedom linear vehicle model and using yaw rate and sideslip angle as the control variables. Yaw moment is applied to four degrees-of-freedom vehicle dynamics model, and then braking or driving forces are distributed over two driven wheels to control electric vehicle stability directly. Under different velocity, the simulation is performed at the different road adhesion coefficient for front wheel steering angle step input or sine input condition using Matlab/Simulink software. The simulation results show a good response characteristic. Itpsilas illustrated that the method is able to control vehicle yaw rate and side slip angle effectively, enhance vehicle handling stability and reduce driver fatigue as well.