A Study on the Performance Improvement of a Nonlinear Fuzzy PID Controller

비선형 퍼지 PID 제어기의 성능 개선에 관한 연구

  • 김인환 (진주산업대학교 기계공학과) ;
  • 이병결 (한국해양대학교 대학원 제어계측공학과) ;
  • 김종화 (한국해양대학교 기계ㆍ정보공학부)
  • Published : 2003.11.01

Abstract

In this paper, in order to improve the disadvantages of the fixed design-parameter fuzzy PID controller. a new fuzzy PID controller named a variable design-parameter fuzzy PID controller is suggested. The main characteristic of the suggested controller is to adjust design-parameters of the controller by comparing magnitudes between fuzzy controller inputs at each sampling time when controller inputs are measured. As a result. all fuzzy input partitioned spaces converge within a time-varying normalization scale. and the resultant PID control action can always be applied precisely regardless of operating input magnitudes. In order to verify the effectiveness of the suggested controller. several a computer simulations for a nonlinear system are executed and the control parameters of the variable design-parameter fuzzy PID controller are throughly analyzed.

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