Simulation And Experimental Study Of Anti-lock Braking System Controller

With the development of automobile industry, more and more demands to vehicle activesafety performance are taken into account. Automobile Anti-lock Braking System (ABS) is an active safety device. It can raise the safety performance and reduce accident rate. ABS has become a standard device in many vehicles. In China now, the inspection of ABS, mainly depends on the road experiment which needs much money, much time and much labour, lack of efficient and accurate testing means in room. Therefore it is difficult to meet the requirement of ABS development and production. Therefore Simulation is important to study the anti-Lock braking systems and enhance the braking performance of automobile.In this dissertation, the domestic and overseas development of ABS and the research methods, ABS structure and function of hardware are introduced respectively. Former braking model is deduced by analyzing the forces which on the vehicle body. A new method which build the braking model is introduced. The kinetic is wear down by friction that come from the wheels and road, and braking block when vechicle is braking. A single wheel mathematical model is deduced with this principle. In order to validate this model, ABS-equipped model is simulated in the MATLAB/SIMULINK environment. The comparison between the simulation results and the road test results with ABS-equipped show that the kinetic transformation method is feasible to analyze the braking process. ABS controller simulation models with slip rate controlled by Bang-Bang PD logical threshod algorithm model are established and simulated. The simulation results are analyzed in detail. Simulation results show that,if the best-fit slip rate is known,PD control slip rate control algorithm is the best,but in the actual application it difficult to determine best-fit slip rate, so logic threshold algorithm is more practical. A simple ABS test stand is made. Experiments of the disgned ABS controller based on the transform of the vehicle kinetic energy can be done by using this test stand.