Simulations Of The Vehicle Anti-lock Braking System On Joint Road

The Anti-lock Braking System is an active safety device; it specially designed to avoid pulling, side slipping and losing steering control due to wheel lock during the car braking. And consequently, it improves the ability to control car direction, car maneuverability of avoiding obstacle and the ability of keeping track and shortens the barking distance. The Anti-lock Brake System plays an important role in averting traffic accident and has both social and economic effects.Firstly, this paper uses mathematical modeling to establish some major models, such as the vehicle dynamic model, slip rate model, braking system model, tire model, PID controller, and fuzzy PID controller. And then this paper constructs the non-ABS system vehicle model, the PID controller vehicle model and fuzzy PID controller vehicle model to conduct simulation experiments on high road friction coefficient surface, low road friction coefficient surface, and joint road surface. The paper compares these three vehicle models in car braking time, braking distance and the car locking situation and the results show that the non-ABS system model vehicles in whatever road conditions lose steering control very quickly, have the longest braking time, and have the farthest braking distance; the PID controller vehicles make the slip ratio stabilize at the optical slip ratio in a short time in order to avoid losing steering control and these vehicles have significant improvement compared with non-ABS system model vehicles; the fuzzy PID controller vehicles constantly adjust the PID parameters by monitoring the deviation between wheel slip ratio and the optimal ratio and the error variation in vehicle braking process, thus maintaining the best braking performance in whatever road surface when compared with the other two vehicle systems.