Application study of fuzzy PID control with S-function on automotive ABS

In order to research the effect of fuzzy PID control with S-function on automotive ABS, the dynamic braking model of 1/4 vehicle and the fuzzy PID controller with S-function were established on the basis of automotive ABS structure, principle and control process. Using this controller, the braking process of automotive ABS was simulated in Matlab/simulink environment. The simulation results were analyzed, and compared with the conventional fuzzy PID controller´s effect. The result of analysis and comparison shows that the automotive ABS under the fuzzy PID control with S-function can make the braking distance shorter in comparison with the conventional fuzzy PID control, and the control parameters has obvious convergence. However automotive ABS using the fuzzy PID control based on S-function has obvious brake judder in later braking period, in the same time the divergence of control parameters increases evidently.