Collect. Czech. Chem. Commun. 1990, 55, 964-980

A hybrid form of fuzzy-logic controller

Josef Vrba and Ywetta Purová

Institute of Chemical Process Fundamentals, Czechoslovak Academy of Sciences, 165 02 Prague 6-Suchdol


A hybrid form of a fuzzy-logic controller with linguistic and numerical variables and fuzzy subset as their common quantifier is presented. It is typical for the controller that the role of conditional statements of its linguistic model is optionally combined with a set of numerical parameters. The statements are automatically generated according to the given state of the system under control, it brings the necessary feature of adaptivity and self-tuning ability. The efficiency of the controller is checked on a set of simulated systems and a real one with pH control as well.