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Control Systems Engineering, 3rd Edition by S. K. Bhattacharya

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Appendix 3

Fuzzy Logic

A3.1  CONCEPT OF FUZZY LOGIC

A classical logic system requires a deep understanding of a system, exact mathematical equations and numerical values of constants.

Fuzzy logic provides an alternative way of thinking, which allows modelling of complex systems using knowledge and experience of operating a control system. It provides a simple way to draw definite conclusions from vague or imprecise information and resembles human decision-making in its ability to work with of approximate data and find precise control system solutions. Fuzzy logic allows expression of knowledge in a subjective way, for example, in a temperature control system, subjective concepts like very hot, very cold, moderately hot, moderately cold and so ...

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