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Slope predictive control and digital PID control for a variable temperature control system

  • US 20080114500A1
  • Filed: 06/12/2007
  • Published: 05/15/2008
  • Est. Priority Date: 05/07/2001
  • Status: Active Grant
First Claim
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1. A method for implementing PID control having a proportional term, an integral term, and a derivative term, the method comprising:

  • receiving a controlled variable measurement and calculating an error between the controlled variable measurement and a desired condition;

    defining at least two distinct regions of operation based at least in part on the error, wherein each region has a predetermined gain set; and

    based on the error, (i) determining a region of operation from the at least two distinct regions, (ii) calculating a PID output using a gain set associated with that region, and (iii) after the expiration of a time increment, re-measuring the controlled variable, re-calculating the error and repeating steps (i)-(iii).

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