Failure diagnosis by using fuzzy logic

The use of fuzzy logic is proposed for the method of failure diagnosis under fuzzy environment. The distinctive points are the description of the relationship between causes and symptoms by a set of fuzzy relational inequalities and the use of the solutions of the inverse problem of these relations. Recently, the method to solve the inverse problem of fuzzy relational equation has been proposed by E. Sanchez et. al,. A new algorithm for the inverse problem is developed With the consideration on the existence condition of the solution. The proposed scheme of diagnosis is illustrated by considering the diagnosis of car troubles. The results obtained from some numerical examples show that the present method would be applicable as a methodology of the more general diagnosis.