Sliding Mode Control of Half-car Active Suspension

The purpose of the sliding mode controller for a vehicle suspension system is to reduce the discomfort sensed by passengers which arises from road roughness and to increase the ride handling associated with the pitching and rolling movements. This necessitates a very fast and accurate controller to meet as much control objectives, as possible. This paper deals with introducing a new technique such as Proportional Integral Sliding Mode controller(PISMC), sliding mode controller(SMC) and PID approaches to Half-Car Active Suspension to design a stability to meet the control objectives. The advantage of this controller is that it can handle the nonlinearities faster than other conventional controllers. The approach of the proposed controller is to minimize the vibrations on each corner of vehicle by supplying control forces to suspension system when travelling on rough road. Simulation results and a comparison with a calssical PID controller are presented and discussed. We studied the stability of the three used controllers in the presence of disturbances. A good performance for the sliding mode controller (SMC) is achieved in simulation studies despite the disturbances.