COOLING DEVICE OF IN-VEHICLE INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To provide a cooling device of an in-vehicle internal combustion engine, capable of properly reducing power quantity consumed for cooling the engine.SOLUTION: The drive of a radiator fan is stopped when a wind quantity of a running wind exceeds the wind blowing quantity of the radiator fan (t2 to t3). The driving stop condition of the radiator fan is continued and the pumping quantity of a water pump is forcibly increased when the increase of consumed power in the first virtual condition assuming that the requirement is satisfied only by the start of the drive of the radiator fan is larger than the increase of consumed power in the second virtual condition assuming that the above requirement is satisfied only by the increase of the pumping quantity of a water pump when there is requirement for increasing the cooling ability of a cooling system with the drive of the radiator fan stopped (t3 to t4). The drive of the radiator fan is started without forcibly increasing the pumping quantity of the water pump when the increase of the consumed power in the first virtual condition is not more than the increase of the consumed power in the second virtual condition (after t4).