![]() ![]() Primary references can be found conveniently in a book with 18 selected papers by Zadeh Pioneering papers on fuzzy sets by Zadeh ( HJ, 1965, 1973, 1975) explain the theory ofįuzzy sets that result from the extension as well as a fuzzy logic based on the set theory. Here is not to give implementation details of the latter, but to use the example to explain theįigure 2: Possible definition of the set KLJK OHYHOV in the tank in Fig. The former strategy (1) is suitable for a Programmable Logic Controller (PLC) usingīoolean logic, and the latter (2) is suitable for a fuzzy controller using fuzzy logic. In two-valued (Boolean) logic the controller can li OO vzlwfkhv iurp4wr3Īn operator, whose responsibility is to open and close the valve, would perhaps describe The sensorOOis4when the level is above the mark, andģwhen the level is below likewise with the sensorOK. ![]() ValveY 4, such that the tank is refilled when the level is as low asOO, and stop the refilling The simplified design in the figureĬonsists of a tank, two level sensors, and a magnetic valve. Mill such that the feed flow is more or less constant. Figure 1: Process diagram of a feed-tank.Ī fuzzy controller, in a cement plant for example, aims to mimic the operator’s terms by
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