1994-07-20
1996-02-27
Davis, George B.
395 61, 395900, G06F 944
Patent
active
054955742
ABSTRACT:
A digital fuzzy inference system has fuzzy inference processors each of which is provided for each of fuzzy rules and comprises if-part membership function defining circuits, a minimum-value calculation circuit and a then-part membership function defining circuit. Each of if-part inputs is supplied to a corresponding if-part membership function defining circuit in which the if-part membership function is defined in accordance with definition parameters and the membership value is calculated by referring to the defined membership function and the input value. For each of the rules, membership values are entered into the minimum-value calculation circuit to select their minimum value. The minimum value is applied to the then-part membership function defining circuit which defines a then-part membership function in accordance with definition parameters and a then-part input. Then-part membership functions for all the rules are synthesized through maximum-value calculation by a membership function synthesizing circuit. The result of synthesis serves as a fuzzy inferential result. For a fuzzy controller for controlling a controlled object in accordance with the inferential result, the center-of-gravity calculation circuit calculates a value of the center of gravity from the synthesized membership function because the inferential result needs one definite value.
REFERENCES:
patent: 4694418 (1987-09-01), Veno et al.
patent: 4716540 (1987-12-01), Yamakawa
patent: 4837725 (1989-06-01), Yamakawa
patent: 4839823 (1989-06-01), Matsumoto
patent: 4860214 (1989-08-01), Matsuda et al.
patent: 4860243 (1989-08-01), Ueno et al.
patent: 4864490 (1989-09-01), Nomoto et al.
patent: 4875184 (1989-10-01), Yamakawa
patent: 4961225 (1990-10-01), Hisano
patent: 5001640 (1991-03-01), Matsumoto et al.
patent: 5012430 (1991-04-01), Sakurai
patent: 5036730 (1991-08-01), Sakai et al.
patent: 5073863 (1991-12-01), Zhang
patent: 5077677 (1991-12-01), Murphy et al.
Nikkei Electronics Oct. 3, 1988 (No. 457).
IEEE Expert, Fall 1986, pp. 55-62; Expert System On A Chip: An Engine For Real-Time Approximate Reasoning; Togai et al AT&T Bell Laboratories.
Application Of Fuzzy Algorithms For Control Of Simple Dynamic Plant, Proc. IEEE, vol. 121, No. 12, Dec. 1974, E. H. Mamdani.
International Workshop On Fuzzy System Applns. Aug. 20-24, 1988 pp. 33 And 34.
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.
Togai et al, "A Fuzzy Logic Chip and A Fuzzy Inference Accelerator for Real-Time Approximate Reasoning", Proc. 17th Inter. Sym. on Multiple Valued Logic; May 26-28, 1987.
Mamdani et al., "Process Control Using Fuzzy Logic", Fuzzy Sets Theory and Applications To Policy Analysis And Information Systems, 1980, pp. 249-265.
"Intrinisic Fuzzy Electronic Circuits for Sixth Generation Computer", Takoshi Yamakawa.
Miyazawa Azuma
Mizobuchi Kozi
Suzuki Takashi
Davis George B.
Olympus Optical Co,. Ltd.
LandOfFree
Digital fuzzy inference system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital fuzzy inference system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital fuzzy inference system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1685604