HOW TO HANDLE THE FLEXIBILITY OF LINGUISTIC VARIABLES WITH APPLICATIONS

In this paper some limitations of the conventional IF — THEN fuzzy rules due to the context dependency and rule structure are discussed. To overcome those limitations, the operational definition of a linguistic variable proposed by Zadeh is extended in such a way that a fuzzy value of a linguistic variable may take several meanings depending on the context. Applied to fuzzy controllers and models, this new operational definition leads to a new class of fuzzy controllers and models. To show its applicability this concept is applied to model the gear selection of two human drivers with different characteristics.