| 摘要 |
PROBLEM TO BE SOLVED: To provide a cooling system for a liquid-cooled internal combustion engine, capable of properly controlling a cooling water temperature even when an engine load is transient. SOLUTION: In this cooling system having a pump 500 acting independently from an engine 100, when a load repeatedly fluctuates longer than a designated timeτ1 with the engine 100 kept under a high load, or when the amount of fluctuation of the load is bigger than a designated value, he duty of the pump 500 is controlled at its designated fixed amount. Thereby, even when the load of the engine 100 is transient, fluctuation of a cooling water temperature or its sudden rise can be suppressed, and the cooling water temperature can be properly kept. Since the fluctuation range of the cooling water temperature can be narrowed, a radiator can be miniaturized, and an inexpensive cooling system can be materialized. In addition, if a flow control valve 400 and a blower 230 are combinedly controlled, the radiation ability of the radiator 200 can be adjusted, and therefore, the consumed power of the pump 500 can be reduced.
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