Analog circuit implementing a fuzzy logic controller

Details Analog circuit implementing a fuzzy logic controller Analog circuit implementing a fuzzy logic controller

1994-03-18

1996-10-29

Downs, Robert W.

395 61, 395900, G06G 700, G06F 1700

Patent

active

055704565

ABSTRACT:
A controller permits the implementation of at least one fuzzy logic rule. It has a determination circuit of the overall degree of truth of the premisses of the rule and a determination circuit of the value to be supplied at the output. The determination circuit of the overall degree of truth has a plurality of distance determination circuits each supplying a distance value which is equal to zero when a particular condition of the rule is exactly verified, and which is a square-law function of the difference between the input value and the reference value of this condition. A transformation circuit receiving at the input the sum of the distance values for the different conditions delivers a signal representative of the degree of truth of the premisses of the rule.

REFERENCES:
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences vol. E75-A, No. 6, Jun. 1992, Tokyo JP pp. 650-654 XP000310882 M. Sasaki et al. "Current-Mode Analog Fuzzy Hardware with Voltage Input Interface and Normalization Locked Loop".
IEEE Transactions on Systems, Man and Cybernetics vol. 23, No. 2, Mar. 1993, New York US pp. 467-477 XP000398705 R. Yager "Element Selection from a Fuzzy Subset Using the Fuzzy Integral".
Fuzzy Sets and Systems vol. 40, No. 3, Apr. 15, 1991, Amsterdam NL pp. 473-489 XP000202697 M. Gupta et al. "Design of Fuzzy Logic Controllers Based on Generalized T-Operators".
Electronics Letters vol. 28, No. 4, Feb. 13, 1992, Stevenage GB pp. 352-354 XP000292285 O. Landolt et al. "CMOS Selfbiased Euclidean Distance Computing Circuit with High Dynamic Range".
Efficient Analog CMOS Implementation of Fuzzy Rules by Direct Synthesis of Multidimensional Fuzzy Subspaces; Mar. 28, 1993; vol. 1; Second IEEE International Conference on Fuzzy Systems Mar. 28 through Apr. 1, 1993; pp. 453-458.

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