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It also tracks the rate of change of lens movement during focusing, and controls its speed to prevent overshoot. Canon developed an autofocusing camera that uses a charge-coupled device (CCD) to measure the clarity of the image in six regions of its field of view and use the information provided to determine if the image is in focus.Hitachi washing machines use fuzzy controllers to load-weight, fabric-mix, and dirt sensors and automatically set the wash cycle for the best use of power, water, and detergent. Matsushita vacuum cleaners use microcontrollers running fuzzy algorithms to interrogate dust sensors and adjust suction power accordingly. Japanese consumer goods often incorporate fuzzy systems.The automotive company Volkswagen was the only foreign corporate member of LIFE, dispatching a researcher for a duration of three years. In 1988 Japan established the Laboratory for International Fuzzy Engineering (LIFE), a cooperative arrangement between 48 companies to pursue fuzzy research. Japanese engineers subsequently developed a wide range of fuzzy systems for both industrial and consumer applications.Yamakawa eventually went on to organize his own fuzzy-systems research lab to help exploit his patents in the field. Yamakawa subsequently made the demonstration more sophisticated by mounting a wine glass containing water and even a live mouse to the top of the pendulum: the system maintained stability in both cases. This is a classic control problem, in which a vehicle tries to keep a pole mounted on its top by a hinge upright by moving back and forth.
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Their ideas were adopted, and fuzzy systems were used to control accelerating, braking, and stopping when the Namboku Line opened in 1987. Interest in fuzzy systems was sparked by Seiji Yasunobu and Soji Miyamoto of Hitachi, who in 1985 provided simulations that demonstrated the feasibility of fuzzy control systems for the Sendai Subway.Other research followed, with the first industrial application, a cement kiln built in Denmark, coming on line in 1975.įuzzy systems were initially implemented in Japan. He elaborated on his ideas in a 1973 paper that introduced the concept of "linguistic variables", which in this article equates to a variable defined as a fuzzy set. Zadeh of the University of California at Berkeley in a 1965 paper. History and applications įuzzy logic was proposed by Lotfi A.
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This makes it easier to mechanize tasks that are already successfully performed by humans. Although alternative approaches such as genetic algorithms and neural networks can perform just as well as fuzzy logic in many cases, fuzzy logic has the advantage that the solution to the problem can be cast in terms that human operators can understand, so that their experience can be used in the design of the controller. The term "fuzzy" refers to the fact that the logic involved can deal with concepts that cannot be expressed as the "true" or "false" but rather as "partially true". 5 Logical interpretation of fuzzy controlįuzzy logic is widely used in machine control.