o It deals with reasoning that is approximate rather than fixed and exact.
o Compared to traditional binary sets (where variables may take on true or false values) fuzzy logic variables may have a truth value that ranges in degree between 0 and 1.
o Fuzzy logic has been extended to handle the concept of partial truth, where the truth value may range between completely true and completely false.
o Furthermore, when linguistic variables are used, these degrees may be managed by specific functions.
o The term "fuzzy logic" was introduced with the 1965 proposal of fuzzy set theory by Lotfi A. Zadeh
o Fuzzy logic has been applied to many fields, from control theory to artificial intelligence. Fuzzy logics however had been studied since the 1920s as infinite-valued logics notably by Łukasiewicz and Tarski.
o Fuzzy logic has rapidly become one of the most successful of today's technologies for developing sophisticated control systems.
o The reason for which is very simple. Fuzzy logic addresses such applications perfectly as it resembles human decision making with an ability to generate precise solutions from certain or approximate information.
o It fills an important gap in engineering design methods left vacant by purely mathematical approaches (e.g. linear control design), and purely logic-based approaches (e.g. expert systems) in system design.
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While other approaches require accurate equations to model real-world behaviors, fuzzy design can accommodate the ambiguities of real-world human language and logic.
While other approaches require accurate equations to model real-world behaviors, fuzzy design can accommodate the ambiguities of real-world human language and logic.
o It provides both an intuitive method for describing systems in human terms and automates the conversion of those system specifications into effective models.
o for example, the fuzzy washing machine . A load of clothes in it and press start, and the machine begins to churn, automatically choosing the best cycle.
o The fuzzy microwave, Place chili, potatoes, or etc in a fuzzy microwave and push single button, and it cooks for the right time at the proper temperature.
o The fuzzy car, maneuvers itself by following simple verbal instructions from its driver.
o It can even stop itself when there is an obstacle immediately ahead using sensors.
o But, practically the most exciting thing about it, is the simplicity involved in operating it.
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