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 Title: |
US6078911:
Compilation of rule bases for fuzzy logic control
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Bonissone, Piero Patrone; Schenectady, NY
Comly, James Baldwin; Schenectady, NY
Dausch, Mark Edward; Schenectady, NY
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| Assignee: |
General Electric Company, Schenectady, NY
other patents from GENERAL ELECTRIC COMPANY (218550) (approx. 30,796)
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| Published / Filed: |
2000-06-20
/ 1994-08-10
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| Application Number: |
US1994000288154
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| IPC Code: |
Advanced:
G06N 7/02;
G06N 7/04;
Core:
G06N 7/00;
IPC-7:
G06F 15/18;
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| ECLA Code: |
G06N7/02T; G06N7/04;
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| U.S. Class: |
Current:
706/052;
706/046;
Original:
706/052;
706/046;
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| Field of Search: |
395/003,11,51,61,900,911
706/046,52
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| Priority Number: |
| 1994-08-10 |
US1994000288154 |
| 1991-10-15 |
US1991000775873 |
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| Abstract: |
A fuzzy logic controller is compiled into values in a look-up table such that the table may be used for adjusting a process dependent upon the state variables. The look-up table may be generated by use of a Mean of Maxima (MOM) technique for defuzzification. Alternately, an approximate Height Method (HM) may be used to provide defuzzification. The MOM and HM techniques allow fuzzy logic control without executing any rules in run-time. A further alternative uses an exact height method and minimizes the number of rules which are executed in run time.
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| Attorney, Agent or Firm: |
Goldman, Dave C. ;
Breedlove, Jill M. ;
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| Primary / Asst. Examiners: |
Hafiz, Tariq R.;
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| Maintenance Status: |
E1 Expired Check current status
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| INPADOC Legal Status: |
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| Parent Case: |
This application is a Continuation of application Ser. No. 07/775,873 filed Oct. 15, 1991, now abandoned.
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| Family: |
None
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First Claim:
Show all 12 claims |
What is claimed is:
1. A compiled fuzzy logic control system for controlling a process, comprising:
- means for sensing at least two continuously defined state variables of the process;
- means for receiving the sensed state variables from the sensing means;
- a memory having a look-up table stored therein at a plurality of memory locations, the look-up table being a compilation of values derived from executing a fuzzy logic rule base for the sensed state variables, such that each of said plurality of memory locations stores a value representative of an output derived from an operation of the fuzzy logic rule base, wherein a portion of the stored values are representative of the output from executing a single corresponding rule of the fuzzy logic rule base and other stored values are dependent on the outputs from executing a corresponding plurality of rules of the fuzzy logic rule base;
- means for generating an address for the sensed state variables to a location in the look-up table of the memory;
- means for reading the look-up table in the memory location corresponding to the generated address and outputting the stored value derived from executing the fuzzy logic rule base therefrom; and
- actuating means coupled to the reading means for receiving the stored value and outputting a control action to the process in accordance with the stored value derived from executing the fuzzy logic rule base.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 6 U.S. patent(s) that reference this one
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| Foreign References: |
None
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| Other Abstract Info: |
DERABS G2000-627611
DERABS G2000-627611
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| Other References: |
"Analysis of a Fuzzy Logic Controller", by W.J.M. Kickert & E.H. Mamadani, Fuzzy Set and Systems, 12:29-44, 1978.
"The Implementation of Fuzzy Algorithms for Control", by D.A. Rutherford & G.C. Bloore, Proceedings of the IEEE, 64(4):572-573, 1976.
"Fuzzy Sets", by L.A. Zadeh, Information and Control, 8:338-353, 1965.
"Time-Constrained Reasoning Under Uncertainty", by Piero P. Bonissone & Pete C. Halverson, Journal of Real Time Systems, 2:22-45, May 1990.
"OPS, A Domain-Independent Production System Language", by C. Forgy & J. McDermott, In Proc. Fifth Intern. Conf. on Artificial Intelligence, pp. 933-939, 1977.
"Rete: A Fast Algorithm for the Many Pattern/Many Object Patter Match Problem", by Charles L. Forgy, Journal of Artificial Inteligence, 19(1):17-37, Sep. 1982.
Chiueh, "Optimization of fuzzy logic inference architecture"; Computer, vol. 25 Iss. 5, pp. 67-71, May 1992.
Watanabe et al, "VLSI fuzzy chip and inference accelerator board systems", Proceedings of the Twenty-First International Symposium on Multiple-valued logic, pp. 120-127, May 26-29, 1991.
Yamguchi, "Fuzzy adaptive control with an associative memory system", International Conference on Control '91, pp. 944-949 vol. 2, Mar. 25-28, 1991.
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