OBVIATING METHOD FOR RULE COMPETITION IN PRODUCTION SYSTEM

PURPOSE:To efficiently execute the obviation of a competition rule, and also, to flexibly cope therewith by a state of the system by obtaining an evaluation function of each feature quantity by using a membership function corresponding to each rule. CONSTITUTION:When a feature quantity is inputted from a sensor, etc., a grade value of a membership function corresponding to each rule is derived at every condition item of each rule thereof, and also, the membership function for giving the minimum grade value in the grade values derived at every condition item of each rule is set as an evaluation function of its rule. That is, when a feature quantity xn is inputted, first of all, differences ds1 - ds3 to reference values S1 - S3 of each LHS are derived, and also, grade values g1 - g3 are derived at every membership function 5, and the membership function 5 for giving the minimum value in these grade values g1 - g3 is set as an evaluation function of the feature quantity xn. In such a way, even if the rule does not coincide completely with the rule accumulated in a knowledge base, an inference is executed, and an appropriate action (conclusion) can be obtained.