Plenary lecture 1: methods to design fuzzy controllers
Constantin Voloşencu · 2009
Fuzzy logic is used to develop so-called fuzzy PID controllers, which are non-linear controllers with large applications in process control. The advantages of fuzzy control are better quality control criteria and robustness at error in parameter estimation and at disturbance influence. The paper presents some general methods to design PID fuzzy controllers using families of input-output transfer characteristics of fuzzy blocks and gain characteristics. Based on these transfer characteristics we may do a pseudo-equivalence of PID fuzzy controllers with linear PID controllers. Also, the paper presents the way of fuzzy controller design to assure absolute global internal stability of fuzzy control system. Some applications are presented with modeling and simulations for a large class: PI, PD and PID fuzzy controllers. Results of simulation demonstrate the viability of the design methods.