Method and system for detecting low refrigerant charge and air conditioner protection system

A method and system for detecting a low charge condition in an air conditioner for a vehicle. The system first determines whether noise factors are present that would interfere with reliably measuring a pressure delta. If noise factors are not present, the system determines a pressure delta value fo...

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Bibliographische Detailangaben
Hauptverfasser:	JOHNSTON WILLIAM STEWART, HAMILTON HUGH, WONG DAVID ALAN, DHAR DEBASISH, KOBERSTEIN MANFRED
Format:	Patent
Sprache:	eng
Schlagworte:	ARRANGEMENTS OR ADAPTATIONS OF HEATING, COOLING, VENTILATING,OR OTHER AIR-TREATING DEVICES SPECIALLY FOR PASSENGER OR GOODSSPACES OF VEHICLES BLASTING COMBINED HEATING AND REFRIGERATION SYSTEMS HEAT PUMP SYSTEMS HEATING LIGHTING LIQUEFACTION SOLIDIFICATION OF GASES MANUFACTURE OR STORAGE OF ICE MEASURING MEASURING QUANTITY OF HEAT MEASURING TEMPERATURE MECHANICAL ENGINEERING PERFORMING OPERATIONS PHYSICS REFRIGERATION MACHINES, PLANTS OR SYSTEMS REFRIGERATION OR COOLING TESTING THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR TRANSPORTING VEHICLES IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	A method and system for detecting a low charge condition in an air conditioner for a vehicle. The system first determines whether noise factors are present that would interfere with reliably measuring a pressure delta. If noise factors are not present, the system determines a pressure delta value for the compressor by comparing the high side pressure when the clutch is engaged to a high side pressure when the clutch is disengaged. If the pressure delta value is less than a threshold value, a low charge condition may be recorded. When the number of low charge conditions detected exceeds a predetermined number of events, the system may set a temperature diagnostic trouble code, disable the air conditioning system and alert the driver of a potential problem.