비선형 퍼지 PID 제어기의 성능 개선에 관한 연구

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.