Variable structure control with sliding mode for a class of hydraulic nonlinear system

A nonlinear system model for a class of hydraulic device was constructed.On the basis of the conversion of its model,an exponent approaching law with variable parameter was adopted to realize the sliding mode control. A position tracking with high precision was realized,and it had a better disturbance-resistant ability . A boundary layer technique was used to reduce the chattering in sliding mode control .The simulation result proves that the designed controller can achieve the scheduled demand and has a good effect.