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OIL CIRCULATION OBSERVER FOR HVAC SYSTEMS

  • US 20100037637A1
  • Filed: 10/21/2009
  • Published: 02/18/2010
  • Est. Priority Date: 11/19/2003
  • Status: Active Grant
First Claim
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1. A method of monitoring a parameter related to lubricant in a first component of a vapor compression cycle system, comprising:

  • estimating a first parameter which indicates a first amount of retained lubricant in a first other component of the vapor compression cycle system using a dynamic, non-linear observer model to generate an estimated first parameter;

    estimating a second parameter which indicates a second amount of retained lubricant in a second other component of the vapor compression cycle system to generate an estimated second parameter;

    summing the estimated first parameter and the estimated second parameter to generate a summed estimated parameter; and

    subtracting the summed estimated parameter from a parameter related to a known total lubricant in the vapor compression cycle system to generate a difference parameter, the difference parameter indicating an amount of lubricant retained in the first component of the vapor compression cycle system.

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