Combining the merits of variable structure control(VSC)

adaptive control and fuzzy technique

an adaptive fuzzy variable structure control has been developed.A variable structure controller with integral switching plane function is designed

and a two-dimension fuzzy scheduling mechanism is designed for boundary layer width tuning to reduce chattering.Based on Lyapunov stability theory

an adaptive algorithm is used to adaptively tune the parameters of VSC.Experiment results applied to hydraulic servo system show that both chattering reduction and higher steady state precision can be effectively carried out by using the proposed control method.The proposed control system has stronger robustness and adaptation.