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A New Strategy to Design an Adaptive Fuzzy Variable Structure Controller

The purpose of this study was to develop a new strategy to design a Fuzzy-Vsscontroller that integrates the concept of fuzzy logic and a variable structure system (VSS). A VSS is used to define the switching surface of fuzzy logic to update the increment of the input signal so that the states of the controlled plant strike and slide along the switching surface and reduce the influence of parameter variations. The controller was applied to an adaptive tracking control model reference for a demonstration. A simple adaptive tracking model reference control loop was designed and its adaptive mechanism implemented using the Fuzzy-Vss to ensure that the output of the controlled plant can track the output of the reference model quickly. To verify the effectiveness of the Fuzzy-Vss, the unit step response, sine wave tracking response, and impulse disturbance rejection were simulated. Simulation results indicated that the proposed controller is practical and feasible.