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Fuzzy Estimator Design for the Control Systems with Unknown Time-Delay

In this paper, a fuzzy estimator based on the Smith predictor for a time-delayed system is proposed. The purpose of this work is to predict the unknown plant time-delay by using a fuzzy logic controller. A classical controller is first designed for ideal non-time-delay systems. The developed fuzzy estimator measures the unknown plant time-delay. Once the estimation process completed, the control system performs an ideal non-time-delay system. The validity and effectiveness of the proposed method is shown with simulation results. Improved response can be obtained.