An Active Suspension System using Fuzzy Rules Adjustable Algorithm

To improve vehicle comfort and road holding capability, 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, 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. According to the evaluation method of riding comfort and handling safety of vehicle, the acceleration of the sprung mass, dynamic tyre load and dynamic deflection between the sprung mass and the unsprung mass are determined as the evaluation targets of suspension performance. For two degree-of- freedom (DOF) vehicle model, the simulation of vehicle performance in road signal is studied, its results show the adjustable fuzzy algorithm can effectively control the vibration of vehicle system.