System for controlling air flow to a vehicle air conditioning un

Details System for controlling air flow to a vehicle air conditioning un System for controlling air flow to a vehicle air conditioning un

1995-08-31

1997-04-29

Tanner, Harry B.

Refrigeration

Automatic control

Responsive to vehicle body motion or traction

62184, 123 4111, F25B 3904

Patent

active

056238355

ABSTRACT:
An engine cooling fan control system includes a vehicle speed sensor, a pressure sensor for sensing the pressure of refrigerant provided to a refrigerant condenser forming part of the vehicle air conditioning system and a controller responsive to the vehicle speed and refrigerant pressure signals to operate an engine cooling fan. The engine cooling fan is activated continuously while vehicle speed is below a first speed threshold if the refrigerant pressure exceeds a first pressure. While the vehicle speed is above the first speed threshold, but below a second speed threshold, the engine cooling fan is activated for a predetermined duration if the refrigerant pressure is above the first pressure. Finally, while the vehicle speed is above the second speed threshold, the engine cooling fan is activated in response to the refrigerant pressure exceeding the first pressure and deactivated in response to the refrigerant pressure falling below a second lower pressure.

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