The paper presents a solution for control of hydraulic position problem in case of servomechanism, by using a sliding model control with a fuzzy boundary layer. A nonlinear hydraulic servomechanism which has an asymmetric cylinder is modeled and simulated first, and then the proposed control scheme is applied to this model versus the conventional sliding mode control. Simulation results proved that the chattering free position control is achieved by tuning the fuzzy scaling factors properly.
