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Fuzzy control system

  • US 5,412,757 A
  • Filed: 11/26/1991
  • Issued: 05/02/1995
  • Est. Priority Date: 11/28/1990
  • Status: Expired due to Term
First Claim
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1. A fuzzy control system for controlling a physical object, the physical object being responsive to a control signal and producing a status signal corresponding to the status of the physical object, the fuzzy control system comprising:

  • means for receiving the status signal from the physical object;

    means for generating a control reference value;

    means for selectively calculating a control deviation from the received status signal and the control reference value;

    operation means, connected to said selective calculating means, for performing a fuzzy inference operation on the control deviation calculated by said selective calculating means and a control deviation contained in a fuzzy rule, the fuzzy rule defined by expert knowledge, to obtain a control deviation membership function;

    calculating means for calculating matching between a membership function about an internal state of said physical object and a membership function about an internal state variable included in said fuzzy rule to obtain a matching point, and calculating a membership function about the control signal for said physical object and a membership function about a new internal state variable from an internal state variable membership value corresponding to the matching point;

    means for storing the membership function about said new internal state variable;

    and means for outputting said control signal to said physical object and controlling the physical object.

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