Variable Structure Model Following Control for Dual-Input Active Suspension

In order to improve the robustness of the active suspension while ensuring its performance, variable structure model following control (VSMFC) theory was applied to the design of the controller for active suspensions of 4-degree-of-freedom (4-DOF) automobile model in this paper. The sliding mode equation was derived by using VSMFC theory and the parameters of the switching function are determined by using the method of pole assignment; A hierarchical algorithm with control variables started in sequence was applied to solver the active force; A method of exponential approach law was used to improve the dynamic controller quality. The efficacy of the scheme was investigated by simulations taken out with the help of MATLAB/SIMULINK. The results show that the active suspension controller based on VSMFC theory is superior in both robustness and performance.