Design of adaptive fuzzy controller for active suspension system

With the nonlinearity of the road-vehicle system, an adjustable fuzzy control algorithm which fuzzy control rule table can be obtained with the numerical calculation is advanced. Because the algorithm can adjust the rectification factor of fuzzy controller with the least means squares (LMS) method, it not only can reflect the advantage of fuzzy logic in nonlinearity system but also can improve the disadvantage of common fuzzy control method strongly depending on the experience. For two degree-of-freedom (DOF) vehicle model, the riding comfort and handling safety of vehicle are regarded as control aims, the simulation of vehicle performance in road signal is studied, its results show the adaptive fuzzy controller can effectively control the vibration of vehicle system and reduce the acceleration of the sprung mass by a factor of 20.