Sliding mode control and fuzzy logic control have been combined together in a variety of ways. One approach taken by many researchers is to use fuzzy logic to smooth the chattering in sliding mode control. Another unusual approach taken by few researchers is to use sliding mode control in a fuzzy logic controller. This paper presents the details of both approaches and compares their respective properties. The paper concludes that the first approach has little technical value, if not totally useless, and the second approach is technically applicable.
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