A method to design the controller using three input variables by fuzzy logic and hedge algebra

Abstract

In recent years, the study of hedge algebra applications in control has been remarkably successftil. The Hedge Algebra based controller developed from fuzzy logic can be applied for industrial objects. However, the algorithm for designing ftjzzy logic controller and Hedge Algebra based controller is more complicated. Namely, the calculating time greater than that of PID controller could make difficulties in the designing process for objects that require high speed response.

This paper presents an idea and algorithm to design the Hedge Algebra based controller by adding more inputs in order to supply additional information about the change in the system as well as the noise, then helping the designer to simplify linguistic variable and control rules, and thereby to reduce calculating time for microprocessor (controller) that is chosen in real.