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Author: search.filters.author.Chen, GuanrongSubject: search.filters.subject.Fuzzy control

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    On Comparison of Hybrid Fuzzy PI Plus Conventional D Controller Versus Fuzzy PI+D Controller
    (2004-02-01)
    Sooraksa, Pitikhate
    ;
    Chen, Guanrong
    This letter points out that a comparison given in an earlier paper by Er and Sun is incorrect. The fuzzy PI+D controller designed by Misir et al. is overall better than the hybrid fuzzy PI plus conventional D controller designed by Er and Sun.
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    On comparison of a conventional proportional-integral plus derivative controller versus a fuzzy proportional-integral plus derivative controller: A case study of subsystem failure
    (2002-01-01)
    Sooraksa, Pitikhate
    ;
    Chen, Guanrong
    A conventional PI+D controller is a practical structure of PID typed controllers, widely used in industry and mechatronic applications today. In addition, many fuzzy-control-based versions, embraced the linear structure of the conventional PI+D controller, have been designed and implemented. Although there are many reports proving a superior performance of these fuzzy versions over the conventional ones, there is still a controversy argument over the trade-off between the simplicity and the effectiveness with regard to the implementation as "pros and cons" for these two types of controllers. To help clarify these concerned issues, this paper presents a detailed study on comparison of the conventional PI+D controller versus a fuzzy Pl+D controller in case of a subsystem failure. Simulations on an induction AC motor are carried out as part of the investigation. In case of failure in the feed-forward path of the PI control subsystem, the finding shows that the conventional controller fails to perform whereas the fuzzy controller remains working very well.