ON THE ANALYSIS OF FUZZY-LOGIC CONTROLLERS

In this paper we address the issue of analyzing the properties of the fuzzy logic controller (FLC). We introduce two basic models of the FLC . The first representation uses the concept of the quasilinear fuzzy m odel - the FLC is approximated by a virtual PID controller, consisting of linear controller connected in parallel. The second interpretation of the FLC is from the point of view of nonlinear control - the FLC i s analyzed as a sliding mode - like controller. Based on these two alt ernative representations are derived rules for designing and tunning f uzzy logic controllers.