Refrigeration – Automatic control – Withdrawing or adding refrigerant from or to normally closed...
Reexamination Certificate
2005-07-05
2005-07-05
Jiang, Chen Wen (Department: 3744)
Refrigeration
Automatic control
Withdrawing or adding refrigerant from or to normally closed...
C062S129000
Reexamination Certificate
active
06912860
ABSTRACT:
A method of operating a directed relief valve (28) for an air conditioning system (10) preferably for a vehicle. The air conditioning system (10) includes a compressor (12), a condenser (16), an expansion device (20), and an evaporator connected to one another by refrigerant lines. The system (10) also includes the directed relief valve (28), which is disposed inline with at least one of the refrigerant lines to ventilate the refrigerant. The directed relief valve (28) includes a detonable squib (36) that explodes in response to a ventilation signal.A controller (40) generates the ventilation signal in response to a refrigerant leak being detected by a sensor (38). The sensor (38) is preferably located within an air space (27) and adjacent to the evaporator (22). If there is a malfunction of one of a plurality of sensors (38), a partial malfunction message is sent to the operator. If all of the sensors (38) malfunction, the controller (40) also generates the ventilation signal and sends a complete malfunction message to the operator. Predetermined amounts of time may be used between detection and leak signal, leak signal and ventilation signal, and leak signal and message to the operator.
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Publication entitled “An Invesigation of R152a and Hydrocarbon Refrigerants in Mobile Air Conditioning” by Mahmoud Ghodbane of Delphi Harrison Thermal Systems, printed from SAE International; published in Mar. 1999.
Kadle Prasad S.
Zima Mark J.
Delphi Technologies Inc.
Griffin Patrick M.
Jiang Chen Wen
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