Method and device for cooling a motor vehicle engine

Details Method and device for cooling a motor vehicle engine Method and device for cooling a motor vehicle engine

2005-04-19

2005-04-19

Yuen, Henry C. (Department: 3747)

Internal-combustion engines

Cooling

Automatic coolant flow control

C123S041130

Reexamination Certificate

active

06880495

ABSTRACT:
A method for cooling a motor vehicle engine consists in regulating the volume and the flow rate of a coolant fluid in a hydraulic circuit provided with a branch equipped with an electronically controlled actuator and means forming radiator. The method comprises a step of determining the temperature of the cooling liquid, a step of comparing the temperature of the cooling liquid with a specified threshold temperature from which the engine is said to be hot, and, when the temperature of the fluid is higher than the threshold temperature, the flow rate in the radiator branch is regulated so as to maintain the temperature of the cooling fluid around a specified setpoint value. The curve representing the opening of the thermostat valve based on the temperature of the cooling fluid exhibits an hysteresis around the setpoint temperature. The invention also concerns a device for cooling a motor vehicle engine.

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