Fuzzy Sliding Mode Control for a Discrete Servo System

A discrete fuzzy sliding mode variable structure controller was studied and designed for a class of electnoydraulic servo system by mans of the combination of sliding mode control theory and fuzzy control theory.Designed based on the exponential reaching law,parameterεof conventional sliding made controller is the key factor of system chattering,and is proportional to it as well.In view of this,fuzzy control theory was introduced into the design to ensure the realtime adjusting of parameterε.Simulation results show that the systern chattering is eliminated perfectly,and the dynamic performance of the control system is improved effectively.