Determining limit cycles in fuzzy control systems

We consider nonlinear control systems including fuzzy logic controllers. The dynamical behavior of such systems may be much richer and more complex than that of linear systems. This paper deals with the application of classical control techniques of system analysis, including frequency domain methods, which allow one to gain a better understanding the behavior of systems controlled by fuzzy logic. In particular these techniques can be used to predict the existence of undesirable limit cycles.