Study of YSC used for all Electric Independent Driving and Braking Electric Vehicle based on Fuzzy PI Control

Abstract

Vehicle handling and stability performance is the premise of giving full play to the performance advantages of all electric independent driving and braking electric vehicle (abbr. AIDBEV). This paper presents the working principle of yaw stability control (abbr. YSC) used for AIDBEV. The YSC adopts fuzzy PI control algorithm. For verifying the control effect of YSC, a simulation platform based on fifteen degrees of freedom vehicle model is built. The sinusoidal steering with amplitude and period increasing is used for simulation. According to the simulation results, the yaw rate can be controlled near the target value when YSC works, but the vehicle is unstable when YSC does not work. Take front left wheel as an example, the maximum braking torque of EMB is reduced by 372.9Nm, accounting for 58% of the total braking torque, and the working time of EMB is reduced by 0.265s, accounting for 49.53% of total working time. This can provide potentiality to optimize EMB. By coupled brake, IWM can recover energy 18.77kJ. It has certain energy saving effect, too.