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Compressor minimum capacity control

  • US 5,950,443 A
  • Filed: 08/08/1997
  • Issued: 09/14/1999
  • Est. Priority Date: 08/08/1997
  • Status: Expired due to Term
First Claim
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1. A method of controlling compressor minimum capacity comprising the steps of:

  • measuring a first condition wherein the first condition is a measure of the temperature of a fluid being controlled;

    comparing the first condition to a first setpoint to determine a first conditioned error;

    modulating compressor capacity relative to the first condition error;

    measuring a second condition wherein the second condition is a measure of the temperature of the compressor;

    comparing the second condition to a second setpoint to determine a second condition error; and

    modulating compressor capacity relative to the second condition error if the magnitude of the second conditioned error is greater than the magnitude of the first conditioned error.

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