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Adaptive control for a cooling system

  • US 20030094004A1
  • Filed: 11/27/2002
  • Published: 05/22/2003
  • Est. Priority Date: 06/07/1995
  • Status: Active Grant
First Claim
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1. A controller for a refrigerant pressure effecting component of a cooling system, comprising:

  • a control processor coupled to said pressure effecting component for providing closed loop control over said component based on an error signal;

    said control processor including memory for storing first processing instructions for performing a control algorithm that includes at least one programmably adjustable gain factor;

    said control processor including memory for storing second processing instructions for adaptively changing said programmably adjustable gain factor by periodically generating a new gain factor;

    said second processing instructions causing said control processor to;

    (a) monitor fluctuation in said error signal and generate a numeric value indicative of the percent fluctuation in said error signal over a predetermined time;

    (b) fuzzify said numeric value by applying a membership function to generate a set of fuzzy input values indicative of degree of membership;

    (c) apply a predetermined set of rules upon said fuzzy input values to generate a set of fuzzy output values, the predetermined set of rules reflecting the degree to which the gain factor associated with a given member of said membership function is to be changed; and

    (d) defuzzifying said fuzzy output values by a combining operation yielding said new gain factor.

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