FUZZY CONTROLS BY PRODUCT-SUM-GRAVITY METHOD DEALING WITH FUZZY RULES OF EMPHATIC AND SUPPRESSIVE TYPES

This paper shows that emphatic effects on fuzzy inference results are observed under product-sum-gravity method by using fuzzy control rules whose consequent part is characterized by a membership function whose grades are greater than 1. Suppressive effects are also realized by employing fuzzy control rules whose consequent part is characterized by a negative-valued membership function. It is shown that good control results are obtained by using the fuzzy control rules of emphatic and suppressive types.