The Study of Automatic Fuzzy Controller

• Main Authors: Wei-Te Lin, 林維德
• Other Authors: Rey-Chue Hwang
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/44426034373750979673

碩士 === 義守大學 === 電機工程學系 === 89 === In many fuzzy control applications, most of researchers have found that the steady state error generally exists in fuzzy control problems. Usually, the system’s error and error change are used as two input parameters of the fuzzy control mechanism. According to the mathematical deduction, the output of the fuzzy controller can be looked as the PD controller with adjustable parameters, if the singleton fuzzifier and center average defuzzifier are adopted in the fuzzy control mechanism. It is the main reason of the steady state error existing in many fuzzy control problems. In this thesis, an automatic fuzzy controller is developed. In this controller, the corresponding values of fuzzy membership function used in fuzzfier and defuzzifier can be automatically adapted based on the error signal of the system output. Even for a very small steady state error, the fuzzy control mechanism can also produce a proper response to generate an adequate output force to overcome and eliminate the steady state error. In this research, the effects of transient time and overshoot of the system will be investigated and reported. Some simulations will be experimented to demonstrate the feasibility and the superiority of the fuzzy controller we developed.