Air conditioner for vehicles

Heating systems – Automatic control – Heat source is a reverse cycle refrigerating system or heat...

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62160, 236 38, F25B 3002

Patent

active

057693161

ABSTRACT:
An air conditioner for a vehicle has a heat pump type refrigerant circuit capable of operating at least in a heating mode. The air conditioner comprises a motor fan for supplying air heated by a heat exchanger to the interior of the vehicle during operation of the heating mode, a sensor for detecting the temperature of the air at a position downstream of the heat exchanger and a control unit for controlling the volume of the air supplied by the motor fan to a predetermined minimum volume by controlling the drive of the motor fan when the detected air temperature is lower than a predetermined temperature. Even in a condition where a sufficiently large heat radiation from the heat exchanger cannot be expected, a large volume of cold air that has been insufficiently heated can be prevented from being discharged into the interior of the vehicle. Because the motor fan is driven at a condition of minimum air volume even when the detected temperature is lower than the predetermined temperature, a rapid variation of air volume caused at the time of changing a fan-stopping condition to a fan-driving condition can be avoided and an abnormal increase in the discharge pressure of the heat pump compressor can be prevented.

REFERENCES:
patent: 4441901 (1984-04-01), Endoh
patent: 4518032 (1985-05-01), Funasaki et al.
patent: 4615481 (1986-10-01), Tanaami et al.
patent: 4860552 (1989-08-01), Beckey
patent: 4866944 (1989-09-01), Yamazaki et al.
patent: 5410149 (1995-04-01), Hara et al.
patent: 5467606 (1995-11-01), Sasaki et al.

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