The Integrated Control Of Semi-Active Suspension And Anti-lock Braking System In Vehicle

Semi-active suspension system and anti-lock braking system are two important subsystems of chassis in vehicle. They have played more and more important roles on vehicle's ride comfort and handling safety. But adding the two subsytems together directly can not make vehicle have the optimal synthetical performance. Thus, an integrated control method for Semi-active suspension system and ABS was brought up in this paper. By studying the relationship between the two subsystems and parameters shared by them, the integrated control method was expected to improve vehicle's synthetical performance.This paper established dynamic models of semi-active suspension and anti-lock braking system, and designed fuzzy controllers for the two system respectively. Simulation results by Matlab/Simulink show that the fuzzy control method can improve performance both of suspension and braking system effectively.Through analysis of the relationship between the above two systems, a combined dynamic model was established and an integrated control idea was developed. In this idea, an integrated controller in order to adjust brake process was designed, while the two fuzzy contollers for semi-active suspension and ABS were unaltered. From the results of simulation, it can be seen that the integrated method can overcome the influence from the semi-active suspension, and improved both braking performance and suspension's performance.A whole automobile model of virtual prototype which was composed with Mepherson suspension, oblique arm suspension and tire model was built in ADAMS. By connecting virtual prototype and control subsystem in Matlab/Simulink, a co-simulation was carried out. Results show that vehicle's performance of ride comfort and handling safety was improved. The integrated idea was proved to be right and effectively.