| 摘要 |
PROBLEM TO BE SOLVED: To prevent deposit from accumulation in an exhaust reflux passage by rapidly increasing a cold water temperature under a state that cooling water flowing through a heat-exchanger is in a low temperature state, regarding an exhaust reflux device for an internal combustion engine. SOLUTION: An EGR cooler 56 to cool EGR gas is interposed in the middle of an EGR passage 52. A cooling water control valve 64 to control a continuity state between an introduction passage 58 and a cooling water passage 56a is situated in an introduction passage 58 to guide cooling water to the cooling water passage 56a of the EGR cooler 56. Further, a water temperature sensor 62 to detect the temperature of cooling water flowing through a cooling water passage 56 is situated at the portion, positioned opposite to the EGR passage 52, of the cooling water passage 56. When the temperature of cooling water is lower than a target temperature, the opening of the cooling water control valve 64 is decreased by an amount equivalent to a temperature difference therebetween. In this case, by decreasing a flow rate of cooling water, a quantity of heat per a unit flow rate of which cooling water deprives EGR gas is increased and cooling water is rapidly increased in temperature.
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