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

  • US 5,251,285 A
  • Filed: 06/07/1991
  • Issued: 10/05/1993
  • Est. Priority Date: 03/25/1988
  • Status: Expired due to Term
First Claim
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1. A method of performing process control in accordance with a target value of a controlled object with a transition of the process being predicted, comprising the steps of:

  • inputting process information;

    determining whether a process behavior at a current control timing is linear based on an evaluation rule for evaluating linearity of the process behavior;

    in response to a determination indicating a linear behavior in said determining step, predicting a control quantity of the controlled object a predetermined period of time after the current control timing, using means for performing a quantitative arithmetic operation which simulates the process in a linear relation;

    in response to a determination indicating no linear behavior in said determining step, predicting the control quantity of the controlled object a predetermined period of time after the current control timing, using means for performing a qualitative arithmetic operation which simulates the process in a fuzzy rule relation;

    determining a manipulation quantity of a control effector from a difference between a predicted value obtained in a selected one of said predicting steps and the target value; and

    controlling the process using the determined manipulation quantity.

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