Internal-combustion engines – Cooling – Automatic coolant flow control
Patent
1991-09-13
1992-07-28
Kamen, Noah P.
Internal-combustion engines
Cooling
Automatic coolant flow control
F01P 702
Patent
active
051333023
ABSTRACT:
A fan control system of a vehicle for controlling an electric motor fan for cooling a radiator for an engine coolant and a condenser for a refrigerant of an air conditioning system of the vehicle by moving air, comprises a vehicle speed sensor, a sensor for sensing the temperature of the engine coolant, a sensor for sensing a discharge pressure of the refrigerant discharged from the compressor of the air conditioning system, and a controller for controlling the motor fan. In the operating range in which the vehicle speed is lower than a predetermined speed and simultaneously the coolant temperature is lower than a predetermined temperature, the controller holds the motor fan off if the discharge pressure is lower than a predetermined pressure even though the air conditioner switch is on. Therefore, the percentage of running time of the motor fan to the total time is reduced.
REFERENCES:
patent: 4425766 (1984-01-01), Claypole
patent: 4590772 (1986-05-01), Nose et al.
patent: 4651922 (1987-03-01), Noba
patent: 4765284 (1988-08-01), Kanazawa et al.
patent: 5018484 (1991-05-01), Naitoh
Yamada Naoki
Yamamoto Yasushi
Kamen Noah P.
Nissan Motor Co,. Ltd.
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