| 摘要 |
PROBLEM TO BE SOLVED: To minimize the power consumption of an electric fan or an electric pump according to the operating condition of a cooled object such as an engine. SOLUTION: A cooling air amount required for a radiator is calculated by using the heating value, refrigerant temperature, and cooling air temperature of the engine, the actual cooling air amount for the radiator is calculated by using a detected moving speed and, when the required cooling air amount is larger than the actual cooling air amount, the electric fan is driven. Under the condition where a radiator air amount capable of suppressing the refrigerant temperature to below a target value or below can be assured even if the electric fan is not operated, the operating frequency of the electric fan can be minimized by stopping the electric fan to increase the durability and power consumption of the electric fan.
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