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In this paper, a control law is developed based on the sliding mode control for electrohydraulic active suspension. The law is derived from simulation of hydraulic system, which contains valve and actuator dynamics.















Controller is designed for a half vehicle model in such a way that the displacement and acceleration ,as two independent set points, to approach to zero. The input servovalve voltage is determined in such a way that, actuators apply required force to sprung mass in order to increase ride comfort. The comparison of passive and active systems for half vehicle model shows that the controller with this strategy can increase ride behaviour. Also the robustness of the controller has been investigated and the results show that the controller is worked very good even with the presence of road noise and vehicle parameters variation.