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(11) | EP 2 412 949 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Engine cooling apparatus |
| (57) An engine cooling apparatus that is capable of suppressing cavitation in a high rotation
region while achieving an increase in a circulation flow rate of cooling water in
a low/medium rotation region. The engine cooling apparatus includes: a main cooling
water circuit that circulates the cooling water between an engine and a radiator;
a branch portion provided between the engine and the radiator; a thermostat; temperature
detecting means; a first bypass flow passage; a second bypass flow passage that connects
the engine to the branch portion; a control valve; a bypass convergence portion; a
water pump; valve opening control means; and engine rotation speed detecting means.
predetermined rotation speed, the opening of the control valve is controlled in a
fully closed direction from the fully open state.
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