| 摘要 |
Discharge flow rate of an electric pump is controlled such that a temperature difference between a coolant temperature at a coolant outlet of an engine and a coolant temperature at a coolant inlet of the engine is maintained to be a predetermined value DELTAT. Accordingly, the discharge flow rate decreases as the engine load decreases. Therefore, the pump work is reduced, and the temperature distribution of the engine is reduced. Accordingly, the engine durability is improved while the thermal distortion of the engine is prevented and the fuel economy is improved.
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