Refrigeration – Automatic control – Of external fluid or means
Patent
1996-07-03
1997-07-22
Doerrler, William
Refrigeration
Automatic control
Of external fluid or means
52126, 52129, B60H 132
Patent
active
056494297
ABSTRACT:
The invention relates to an air conditioner for motor vehicles, with a compressor, a condenser, an expansion valve, and an evaporator, all traversed by a refrigerant in a refrigerant circuit in the above sequence. An air distribution duct leads to the vehicle interior, where the evaporator is located and can be exposed to an air flow. The air flow can be adjusted optionally by means of a servo-controllable flap to supply fresh air or to recirculate the air. A pressure sensor is located between the evaporator and the expansion valve of the refrigerant circuit for safety reasons, to detect the refrigerant pressure in the vicinity of the evaporator. If the refrigerant pressure drops below a presettable minimum acceptable limiting value, the sensor generates a pressure signal that sets the flap controlling the air stream to supply fresh air and activates the corresponding blower as well as an optical and/or acoustic warning device.
REFERENCES:
patent: 4493194 (1985-01-01), Briccetti
patent: 5009076 (1991-04-01), Winslow
patent: 5186014 (1993-02-01), Runk
Doerrler William
Mercedes-Benz AG
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