| Summary: | 碩士 === 國立雲林科技大學 === 電機工程技術研究所 === 86 === Based on the Sliding-Mode control theory, a Takagi-Sugeno type fuzzy controller caalled fuzzy CPI controller is proposed, in this thesis, to improve the performance of Ziegler-Nichols PID controllers. The key feature of the proposed control scheme is that the structure of the commonly used Ziegler-Nichols PID controller is not changed, instead, a novel fuzzy CPI controller is connected in parallel with it. With a fixed rule base, the parameters of the fuzzy CPI compensator are tuned, respectively, for different typical plants, to achieve a more efficient control than conventional Z-N PID controller. The simulation results shows that the maximum overshoot, settlinng time and the oscillation behavior etc, are significantly reduced. Moreover, the sensitivity of the controlled system to the variation of the plant parameters seems to be much less than the conventional Z-N PID controllers. In a comparison with some well-known refinements of the Z-N formula, the proposed control scheme in this thesis has proved to be successful and promising for used in the industrial applications.
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