Sensor and control system for an automotive air conditioning sys

Details Sensor and control system for an automotive air conditioning sys Sensor and control system for an automotive air conditioning sys

1991-11-12

1993-03-30

Wayner, William E.

Refrigeration

Processes

Compressing, condensing and evaporating

62126, 622283, F25B 4900

Patent

active

051972980

ABSTRACT:
An air conditioning system including a refrigerant circulation route, a compressor, a condenser, an expansion valve, an evaporator and a pressure sensor for detecting pressure in the circulation route comprises a refrigerant phase detector provided on the circulation route between the condenser and the evaporator where the refrigerant should be in a liquid phase for detecting whether the refrigerant is in a liquid phase or in a vapor phase and a control for determining whether the compressor is in a locked state in accordance with the signals from the refrigerant phase detector and the pressure sensor. The air conditioning system can precisely determine and detect both compressor lock up and refrigerant leakage without providing a rotation detecting sensor for the compressor.

REFERENCES:
patent: 5036697 (1991-08-01), Fujiwara et al.

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