Computer Simulation on Fuzzy Control of Semi-active Suspension System Based on the Whole Vehicle

With the development of technology, new materials have been invented, which have been applied to improve the performance of structures. Recently, researchers pay their attention to controllable fluids and its applications. Magneto rheological (MR) damper is a kind of devices that uses rheological fluids to modify their mechanical properties. Their mechanical simplicity, large dynamic range, low power requirements, large force capacity, robustness and safe manner operation in case of failure have made them attractive devices to semi-active control in civil, aerospace and automotive fields. The characteristics of the MR damper will change when the rheological fluid is exposed to a magnetic field changing its stiffness and damping coefficients. In this paper, the mathematical models of a seven-degree-of-freedom suspension system based on the whole vehicle are established and the fuzzy controller of vehicle semi-active suspension system is designed. Using Matlab/Simulink software package, the simulation results show that the performance of MR semi-active suspension system with fuzzy controller is better than that of passive suspension system. It is a successful reference for the application of MR semi-active suspension in the vehicle.