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Compressor diagnostic and protection system and method

  • US 7,878,006 B2
  • Filed: 04/04/2005
  • Issued: 02/01/2011
  • Est. Priority Date: 04/27/2004
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a compressor operable in a refrigeration circuit and including a motor;

    a first sensor detecting current supplied to said motor; and

    processing circuitry storing a first relationship between a current variable and a condenser temperature variable and a second relationship between a compressor capacity variable and said condenser temperature variable, said processing circuitry using current data from said first sensor to determine a condenser temperature value based on said first relationship and using said condenser temperature value determined based on said first relationship to determine a capacity value of said compressor based on said second relationship.

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