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Low refrigerant charge protection method

  • US 5,201,862 A
  • Filed: 02/13/1989
  • Issued: 04/13/1993
  • Est. Priority Date: 02/13/1989
  • Status: Expired due to Term
First Claim
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1. In an automotive air conditioning system of the cycling clutch orifice tube type using lubricant in the refrigerant for compressor lubrication and wherein low refrigerant results in short compressor on times and high suction gas temperature, the method of protecting against operation with inadequate refrigerant comprising the steps of:

  • establishing a table of the maximum allowable suction gas temperature for various ambient air temperatures,measuring suction gas temperature and ambient air temperature,comparing the measured suction gas temperature with the corresponding table value,measuring compressor on time,comparing the compressor on time to a preset value,periodically repeating the measuring and comparing steps, anddisabling the compressor when the on time is repeatedly less than the preset value or when the measured suction gas temperature is repeatedly greater than the table value.

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