Consideration to the response of FLC using changing the size of variable of consequence membership function

Most of FLC received input data from error e and change-of-error e´ with no relation with system complexity. Basic scheme follows typical PD and PI or PID controller and that has been developed through fixed MF. In this paper, We studied the relationship between MF and system response and system response through changing Fuzzy variable of consequence MF and propose the simple FLC using this relationship. The response of FLC is changed according to the width of fuzzy variable of consequence MF. As changing the fuzzy variable of consequence MF shows various nonlinear characteristic, we studied the relation between response and MF using analytical method. We designed the effective FLC using three-variable MF and nine rules and took simulation for verification.