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Method and system for process control with complex inference mechanism using qualitative and quantitative reasoning

  • US 5,377,308 A
  • Filed: 02/05/1993
  • Issued: 12/27/1994
  • Est. Priority Date: 03/25/1988
  • Status: Expired due to Term
First Claim
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1. A process control method for controlling a plurality of different types of control effectors individually or in a combination of the control effectors, comprising the steps of:

  • generating, from combinations of current operation quantities for said plurality of control effectors, changeable combinations of operation quantities as operation candidates for a plurality of control effects;

    arithmetically determining predicted values of a plurality of control objective items in a process after lapse of a predetermined time from the time when an operation is carried out with said generated changeable combinations of operation quantities;

    arithmetically determining fitnesses of said arithmetically determined predicted values to membership functions predetermined with fuzzy quantities for the respective control objective items;

    assigning predetermined weights to said fitnesses depending on said control objective items, respectively, to obtain weighted fitnesses and superposing said weighted fitnesses so as to arithmetically determine satisfaction grades for the respective control effector operation candidates;

    outputting, as operation quantities, one of said control effector operation candidates having a maximum satisfaction grade as a result of said superposing operation; and

    controlling each of said plurality of control effectors using said outputted one of said control effector operation candidates.

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