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Adaptive control for a refrigeration system using pulse width modulated duty cycle scroll compressor

  • US 6,467,280 B2
  • Filed: 06/21/2001
  • Issued: 10/22/2002
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Term
First Claim
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1. A diagnostic system for a compressor controller, comprising:

  • a controller adapted for coupling to a compressor, said controller producing a variable duty cycle control signal for adjusting a capacity of said compressor, in which said duty cycle control signal for adjusting a capacity of said compressor, in which said duty cycle is a function of demand for cooling;

    a diagnostic module coupled to said controller for monitoring and comparing said duty cycle with at least one predetermined fault value indicative of a system fault condition, wherein said diagnostic module monitors a percentage of sampled error over a defined period of time; and

    an alert module responsive to said diagnostic module for issuing an alert signal when said duty cycle bears a predetermined relationship to said fault value.

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