Variable Structure Control of the Electro-hydraulic Servo System

Aiming at the pump-controlled cylinder in electro-hydraulic servo system, this paper designs the switching function using the optimal method and Variable Structure Control (VSC) law using reaching condition, and designs observer to obtain pitching speed. The simulation and experiment results show that the VSC control system based on the optimal method is robust to parameters uncertainties and disturbance, it has been successfully applied in the complex and high performance system, the results demonstrate it better than the conventional PID control.