System for switching a rule group

• US 5,165,011 A
• Filed: 08/12/1991
• Issued: 11/17/1992
• Est. Priority Date: 09/22/1988
• Status: Expired due to Term

• Current Assignee: U Krowel LLC (Intellectual Ventures LLC)
• Original Assignee: Omron Tateisi Electronics Co. (Omron Corporation)
• Inventors: Hisano, Atsushi
• Primary Examiner(s): MacDonald, Allen R.
• Application Number:
  US07/745,968
• Time in Patent Office: 463 Days
• Field of Search: 395/11, 395/53, 395/61, 395/51, 395/54
• US Class Current: 706/50
• CPC Class Codes: G06N 5/043 Distributed expert systems; Blackboards
• CPC Class Codes: G06N 5/048 Fuzzy inferencing
• CPC Class Codes: G06N 7/026 Development tools for entering the parameters of a fuzzy system
• CPC Class Codes: Y10S 706/90 Fuzzy logic
• CPC Class Codes: Y10S 706/904 Manufacturing or machine, e.g. agricultural machinery, machine tool
• CPC Class Codes: Y10S 706/905 Vehicle or aerospace
• CPC Class Codes: Y10S 706/906 Process plant

Abstract

A system is disclosed for switching a selected one out of a plurality of rule groups to an inference device which operates on applied input data using the selected rule group. A starting rule group decision unit receives the input data and decides on a starting rule group to be used by the inference device on the received input data. During operation, the selecting unit may designate another rule group to be activated for use by the inference device. The plurality of rule groups are preferably associated with respective rule group processors each having a plurality of rule evaluation units, the starting rule group decision unit decides on one of the rule group processors used in the inference device, and the selecting unit includes a plurality of switching gates respectively assigned to the rule group processors so that a rule group processor is selected for use by activating its assigned switching gates.

Claims

1. A system for selecting one of a plurality of rule groups for use by an inference device which executes inference logic on applied input data, said system comprising:

rule group decision means for receiving said applied input data and deciding, based on selection data which includes said applied input data, which of said plurality of rule groups is to be used as the rule group by said inference device; and

selecting means responsive to said decision means for enabling said inference device to operate on said applied input data using the rule group decided by said decision means.

2. A system as in claim 1, wherein said applied input data represents a status of an object to be controlled by said inference device and said selection data further includes elapsing time data.

3. A system as in claim 1, wherein said rule group is a fuzzy logic rule group.

4. A system as in claim 1, wherein said decision means first receives said applied input data and decides, based on the content of said applied input data, which of said plurality of rule groups is to be initially used as a starting rule group by said inference device.

5. A system as in claim 1, wherein said inference device comprises a plurality of inference logic rule group processors, each comprising a plurality of rule evaluation units for applying a respective rule group to said applied input data and a plurality of switching gates respectively associated with each of said rule group processors, said decision means selecting one of said rule group processors and said selecting means being responsive to said decision means to enable that switching gate associated with the selected rule group processor.

6. A system as in claim 5, wherein said rule group rewriting means includes a user program memory for storing a program for rewriting a non-activated rule group, and an interpreter memory for storing an interpreter to interpret and execute said program.

7. A system as in claim 5, wherein each of said rule group processors includes a rule group storage area, said system further comprising means for rewriting new rule groups into rule group storage areas of said rule group processors.

8. A system as in claim 7, including means for performing said rewriting during the execution of inference logic by said inference device using a selected rule group processor.

9. A system as in claim 7, wherein said rule group rewriting means includes a user program memory for storing a program for rewriting non-activated rule groups, and an interpreter memory for storing an interpreter to interpret and execute said program.

10. A system as in claim 1, further comprising data storage means for storing said plurality of rule groups in group units and rule group rewriting means connected to said data storage means for rewriting new rule groups into said data storage means.

11. A system as in claim 10, including means for performing said rewriting during the execution of inference logic by said inference device using a selected rule group.

12. A system as in claim 10, wherein said rule group rewriting means includes a user program memory for storing a program for rewriting non-activated rule groups, and an interpreter memory for storing an interpreter to interpret and execute said program.

13. A system for selecting one out of a plurality of rule groups for use by an inference device, which executes inference logic on applied input data, said system comprising:

rule group decision means including a central processing unit for determining, based on selection data which includes said applied input data, a rule group to be used by said inference device; and

selecting means connected to said central processing unit and responsive to said decision means for enabling said selected rule group to be an active rule group which is used by said inference device on said applied input data.

14. A system as in claim 13, wherein said selecting means includes an active rule group identification register which is accessible by said central processing unit and means responsive to the content of said active rule group identification register for enabling said inference device to use said selected rule group;

said central processing unit including means for changing the content of said identification register to thereby change the selected rule group used by said inference device.

15. A system as in claim 13, wherein said decision means includes means for receiving said applied input data and means for deciding, based on the content of said applied input data, which of said plurality of rule groups is to be initially used as a starting rule group by said inference device.

16. A system as in claim 13, wherein said inference device comprises a plurality of inference logic rule group processors, each comprising a plurality of rule evaluation units for applying a respective rule group to received input data and a plurality of switching gates respectively associated with said rule group processors, said decision means selecting one of rule group processors and said selecting means being responsive to said decision means to enable that switching gate associated with the selected rule group processor.

17. A system as in claim 16, wherein each of said rule group processors includes a rule group storage area, said system further comprising means for rewriting new rule groups into rule group storage areas of said rule group processors.

18. A system as in claim 17, including means for performing said rewriting during the execution of inference logic by said inference device using a selected rule group processor.

19. A system as in claim 17, wherein said rule group rewriting means includes a user program memory for storing a program for rewriting non-activated rule groups, and an interpreter memory for storing an interpreter to interpret and execute said program.

20. A system as in claim 13, further comprising data storage means for storing said plurality of rule groups in group units and rule group rewriting means connected to said data storage means for rewriting new rule groups into said storage means.

21. A system as in claim 20, including means for performing said rewriting during the execution of inference logic by said inference device using a selected rule group.

22. A system as in claim 20, wherein said rule group rewriting means includes a user program memory for storing a program for rewriting non-activated rule groups, and an interpreter memory for storing an interpreter to interpret and execute said program.

23. A system as in claim 13, wherein said applied input data represents a status of an object to be controlled by said inference device and wherein said selection data further includes elapsing time data.

24. A system as in claim 13, wherein said rule group is a fuzzy logic rule group.