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Method and system for process control with complex inference mechanism

  • US 5,051,932 A
  • Filed: 03/24/1989
  • Issued: 09/24/1991
  • Est. Priority Date: 03/25/1988
  • Status: Expired due to Term
First Claim
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1. A process control system including a plurality of control effectors for controlling a process, and a processing device for operating and controlling said control effectors, said processing device comprising:

  • (a) a knowledge base storing predetermined membership functions and production rules based on empirical information;

    (b) quantitative operation means for determining predicted values of states respectively for a plurality of control objective items by operating on input process information, based on a mathematical model identifying said process;

    (c) first inference means for receiving said input process information as its input and for operating on predicted values of states of said plurality of control objective items, based on membership functions predetermined with fuzzy quantities for each input process information;

    (d) second inference means, (i) supplied with said input process information, (ii) each predicted value obtained from said quantitative operation means and (iii) each predicted value obtained from said first inference mans as its inputs, for determining the behavior of said process, based on one of said production rules, by diagnosing whether or not the process exhibits a linear behavior, selecting a predicted value from said quantitative operation means when the determination result indicates a linear behavior and selecting a predicted value from said first inference means when the determination result does not indicate a linear behavior; and

    (e) third inference means supplied with each predicted value selected by said second inference means, for operating on a satisfaction grade collectively evaluating said plurality of control objective items to thereby determine a combination of control quantities for said control effectors in which the satisfaction grade as a result of said operation is maximum, thereby providing at least one of (i) different types of control effectors and (ii) said plurality of control effectors with an optimal combination of control quantities depending on the behavior of the process.

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