Comparison between PID and fuzzy control Internal Report R93.36I

The goal of this work is to make an analysis of the performances of a fuzzy controller and a comparative study of fuzzy control algorithms with a conventional control approach (PID) in the case of linear dynamic process control. This comparative study is made using computer simulation. The first part is devoted to the formal framework of the theory of fuzzy sets and fuzzy controllers. The second part of this paper is a description of a simulated system, and a presentation of simulated controllers. In the second part, fuzzy controller is examined in details. A sensitivity of the fuzzy logic controller to design parameters, different shapes and superposition of membership functions, is tested. Moreover, the simulations are done for the different types of fuzzy reasoning and defuzzification methods. Ecole Polytechnique Fédérale de Lausanne Département d’Informatique Laboratoire de Microinformatique