Research on Brake Stability Control Strategy for Distributed Electric Vehicles

In order to ensure the shortest braking distance and improve the lateral stability of the vehicle, this paper proposes a distributed stability control strategy for electric vehicles under braking conditions. The vehicle stability region is delineated by combining the sideslip angle - sideslip angle velocity (β- (β) phase plane with the maximum yaw angular velocity, and the longitudinal stability controller and the transverse stability controller are designed according to the stability region in which the vehicle is located. When the vehicle is in the stable region, the braking moment of the wheels is decided by using the DBO fuzzy PID control method; When the vehicle is in the instability region, based on the sliding mode control, the lateral stability controller is designed to calculate the additional yaw moment of the vehicle, and the optimal allocation algorithm is used to allocate the longitudinal moment and the additional yaw moment of the vehicle. Through the joint simulation of Carsim/Simulink, the results show that the control strategy proposed in this paper reduces the deviation of lateral displacement by 0.1m, the deviation of maximum yaw velocity by 0.08rad/s, the maximum sideslip angle by 0.015rad, and the braking distance by 4m compared with the comparative control strategy, which proves the effectiveness of the strategy.