Patent
1995-10-04
1998-01-20
Hafiz, Tariq R.
395 61, 395900, G06G 700
Patent
active
057108684
ABSTRACT:
An arrangement (apparatus and method) using fuzzy logic for fuzzifying a crisp input using a membership function defined by center, width, and type. The input signals are selected and supplied to a fuzzy input processor. The crisp input signal is fuzzified by selected center and width data corresponding to a selected membership function. Each crisp input is fuzzified by determining the distance of the crisp input from the center of the membership function and linearly complementing the result with respect to the width of the membership function, thereby eliminating the necessity for determining the shape of the membership function. The center and width may be fixed or dynamic values. The fuzzified input signals are successively compared in a min-max comparator which determine a minimum rule term for each rule processed. The minimum rule term is compared with a previously stored minimum rule term to determine a maximum among the minimum rule terms. The fuzzy input processor outputs a clock signal whenever a new maximum among the minimal rule terms is determined, and stores the new maximum value. The arrangement also incudes a fuzzy output processor which executes the rule identified by the fuzzy input processor as the optimum rule. A fuzzy memory interface controls the transfer of data for the fuzzy input processor and the fuzzy output processor, thereby optimizing parameter storage. The disclosed arrangement may be integrated as an integrated circuit or a software-controlled computer system.
REFERENCES:
patent: 5012430 (1991-04-01), Sakurai
patent: 5073867 (1991-12-01), Murphy et al.
patent: 5121466 (1992-06-01), Zhang
patent: 5202954 (1993-04-01), Miyazawa et al.
patent: 5222191 (1993-06-01), Enomoto
patent: 5228111 (1993-07-01), Nagazumi
patent: 5243687 (1993-09-01), Ando et al.
patent: 5245695 (1993-09-01), Basehore
patent: 5245698 (1993-09-01), Matsunaga
patent: 5280566 (1994-01-01), Nakamura
patent: 5299283 (1994-03-01), Hamamoto
patent: 5401949 (1995-03-01), Ziemacki et al.
patent: 5412752 (1995-05-01), Basehore et al.
patent: 5459816 (1995-10-01), Basehore et al.
Ruspini, "On the Semantics of Fuzzy Logic", International J. of Approximate Reasoning, vol. 5, Issue 1, Jan. 1991, pp. 45-88.
Mamdani, "Application of Fuzzy Algorithms for Control of Simple Dynamic Plant", Proceedings Institution of Electrical Engineers, London, vol. 121, No. 12, Dec. 1974, pp. 1585-1588.
Lee, "Fuzzy Logic in Control Systems: Fuzzy Logic Controller--Part I", IEEE Transactions on Systems, Man and Cybernetics, vol. 20, No. 2, Mar./Apr. 1990, pp. 404-418.
Devi et al., "Estimation of Fuzzy Memberships from Histograms", Information Sciences, vol. 35, 1985, pp. 43-59.
Braae et al., "Theoretical and Linguistic Aspects of the Fuzzy Logic Controller", Automatica, vol. 15, No. 5, 1979, pp. 553-577.
Zadeh, "Fuzzy Sets", Information and Control, vol. 8, 1965, pp. 338-353.
Tang, "Comparing Fuzzy Logic with Classical Controller Designs", IEEE Transactions on Systems, Man, and Cybernetics, vol. 17, No. 6, Nov./Dec. 1987 pp. 1085-1087.
Lee, "Fuzzy Logic in Control Systems: Fuzzy Logic Controller--Part II", IEEE Transactions on Systems, Man and Cybernetics, vol. 20, No. 2, Mar./Apr. 1990, pp. 419-435.
Ralston et al., "Fuzzy Logic Control of Machining", Manufacturing Review, vol. 3, No. 3, Sep. 1990, pp. 147-154.
Lippmann, "An Introduction to Computing with Neural Nets", IEEE ASSP Magazine, Apr. 1987, pp. 4-21.
Zadeh, "Outline of a New Approach to the Analysis of Complex Systems and Decision Processes", vol. 3, No. 1, IEEE Transactions on Systems, Man, and Cybernetics, vol. 3, No. 1, Jan. 1973, pp. 28-44.
Kohoutek, "Practice of Approximate Reasoning", Proceedings of Manufacturing International '90, Atlanta, Ga., Mar. 25-28, 1990, vol. 5: Design, Reliability, and Education of Manufacturability, pp. 63-68.
Schwartz, "Fuzzy Tools for Expert Systems", AI Expert, vol. 6, No. 2, Feb. 1991, pp. 34-41.
Chiu et al., "A Fuzzy Logic Programming Environment for Real-Time Control", International Journal of Approximate Reasoning, 1988, pp. 163-175.
Watanabe et al., "A VLSI Fuzzy Logic Controller with Reconfigurable, Cascadable Architecture", IEEE Journal of Solid State Circuits, vol. 25, No. 2, Apr. 1990, pp. 376-382.
Zadeh, "Fuzzy Logic", Computer, Apr. 1988, pp. 83-93.
Togai et al., "Expert System on a Chip: An Engine for Real-Time Approximate Reasoning", IEEE Expert, Fall 1986, pp. 55-62.
Leung et al., "Fuzzy Concepts in Expert Systems", Computer, Sep. 1988, pp. 43-56.
Mizumoto et al., "Comparison of Fuzzy Reasoning Methods", Fuzzy Sets and Systems, 1982, vol. 8, pp. 253-283.
Dettloff et al., A Fuzzy Logic Controller with Reconfigurable, Cascadable Architecture, IEEE Conf. on Computer Design (1989) pp. 474-478.
Chiu et al., Real-Time Fuzzy Control: From Linguistic Rules to Implementation on a Chip; Methodologies for Intelligent Systems; Proc. of 2nd Inter. Sym. 14-17 Oct. 1987.
H. Tanaka et al., "Linear Regression Analysis with Fuzzy Model", IEEE Trans. Syst., Man, and Cybernetics, vol. SMC-12, No. 6, (Nov./Dec. 1982), 903-907.
Hafiz Tariq R.
Microchip Technology Incorporated
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