Vehicle Air-Conditioning Device, and Refrigerant Leakage Diagnosis Method for Vehicle Air-Conditioning Device
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United States of America Patent
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Issued Date -
Apr 11, 2013
app pub date -
May 27, 2011
filing date -
Jun 11, 2010
priority date (Note) -
Abandoned
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Abstract
In a vehicle air-conditioning device, refrigerant leakage is diagnosed precisely without any restrictions from an operating condition of the air-conditioning device. When the operating condition of the vehicle air-conditioning device is stable, a threshold value Th for determination of refrigerant leakage is set based on an outlet pressure Pd and an inlet pressure Ps of a compressor. Furthermore, a volume flow Gr in that refrigerant pipe running from a condenser to an expansion valve through which the refrigerant circulates in a liquid state is detected. When it is determined that the volume flow Gr exceeds the threshold value Th for determination of refrigerant leakage, a diagnosis result (alarm) indicating that the refrigerant leaks is output.
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