The implementation of fuzzy logic in industrial controllers

Abstract

The theory of fuzzy sets is a methodology for the handling of qualitive, inexact, imprecise information in a systematic and rigorous way. Conventional control approaches require a mathematical model of the process or system to be controlled. However, when an accurate knowledge of the process dynamics is not available, or the process is highly complex or non­ linear, conventional techniques do not give satisfactory results and human control operators must still be used. In contrast, fuzzy logic captures and utilizes the accumulated empirical know-how of human operators expressed in qualitative, inexact, imprecise ways.