Fuzzy Integral Sliding Mode Control for Nonlinear System and Application for Electro-hydraulic Servo System

A design method of fuzzy integral sliding mode control was put forward for a class of nonlinear system with uncertainty in this paper.Integral control was introduced to avoid assuming that the derivative of desired signal must be known in conventional sliding mode variable structure control.Fuzzy control was adopted based on integral sliding mode control,which would effectively alleviate the chattering brought by nonlinear control without sacrificing the strong robustness to parameter variations and external disturbances.The simulation results of the position tracking control for some electro-hydraulic servo system showed that the control approach was robust and improved tracking accuracy considerably.