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Modular multivariable control apparatus and method

  • US 5,191,521 A
  • Filed: 06/18/1990
  • Issued: 03/02/1993
  • Est. Priority Date: 06/18/1990
  • Status: Expired due to Term
First Claim
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1. A method of controlling a process variable through at least two control efforts, comprising the steps of:

  • a) measuring a disturbance of the process variable from a desired value;

    b) determining the dead time interval between the change of a control effort and a change in the process variable for each such control effort;

    c) changing at least one such control effort to at least partly compensate for such disturbance in the short term;

    d) changing at least one such control effort to at least partly compensate for such disturbance in the long term; and

    e) returning such control efforts changed to compensate in the short term to their original values after such control efforts changed to compensate in the long term have compensated for such disturbance.

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