Survey on Practical Applications of Fuzzy Rule Interpolation

In the last thirty years fuzzy logic became very popular. One can find solutions based on it in several fields from industrial systems to house appliances. Recently a new category of fuzzy systems gained more attention, the so called fuzzy rule interpolation (FRI) based systems. Owing to the low complexity of their rule bases, i.e. they can infer as well when only the relevant rules are known, they can be applied successfully even in cases when a traditional fuzzy system could not give an interpretable result in lack of the full coverage of the rule base. In this paper, after doing a survey on FRI methods we present several successful practical applications organized in three main areas, namely fuzzy control, function approximation and expert systems.