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Fuzzy-boolean multi-stage inference apparatus

  • US 5,191,638 A
  • Filed: 03/29/1990
  • Issued: 03/02/1993
  • Est. Priority Date: 03/31/1989
  • Status: Expired due to Term
First Claim
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1. A fuzzy multi-stage inference apparatus to be employed in information processing systems for diagnosis or recognition purposes, comprising:

  • an inference rule memory for storing fuzzy inference rules comprising IF parts, THEN parts, and Boolean logic inference rules;

    an inference means for deriving control commands for executing multi-step inference processing comprising one of (i) fuzzy logic inferences and (ii) fuzzy logic and Boolean logic inferences in series or in parallel by utilizing said rules stored in said inference rule memory; and

    an inference rule selector for determining, by using an evaluation formula, a priority inference rule to be executed by said inference means in a succeeding step in said multi-step inference processing;

    wherein;

    said inference means outputs a portion of the fuzzy inference rules stored in said inference rule memory to a working region of said memory;

    said inference means executes said multi-step inference processing by using only said inference rules outputted to said working region,said inference rules are divided into plural knowledge sources each of which comprises fuzzy inference rules and Boolean logic inference rules,said inference means outputs said fuzzy inference rules and said Boolean logic inference rules in one of said knowledge sources to said working region for use in execution of fuzzy logic and Boolean logic inferences, andsaid inference rule selector comprises a priority memory in which said priority of inference rules is stored;

    a compatibility processor for deriving a compatibility of said inference rule to said IF parts; and

    an inference rule determination means for deriving an inference rule having a priority of more than a predetermined value and a highest priority in said priority memory.

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