Abstract: A two-degree freedom mathematical model for the semi-active suspension system is built. Adaptive fuzzy control is adopted to improve the ride comfort without endangering the safety, which combines fuzzy identification with fuzzy control. Considering the complexity of the adaptive algorithm, the maximum administering scheme is adopted to readjust the control rules, thus simplifying the computation. The simulation shows that compared with passive suspension and fuzzy control, the new model can reduce the vehicle’s vibration and interference, improve the handling stability and settle the contradiction between the ride comfort and the handling stability, thus realizing the optimum performance compromise between comfort and safety in various running conditions.

Key words: Compromise, Control, Semi-active suspension