| 摘要 |
PROBLEM TO BE SOLVED: To prevent supercooling of EGR gas in an EGR cooler. SOLUTION: This exhaust gas recirculation device with the cooler is provided with an EGR pipe 18 with one end connected to an exhaust manifold 14 and another end connected to an intake manifold 12, the EGR cooler 19 provided on the EGR pipe 18, a refrigerant supply pipe 22 supplying cooling water of an engine 11 to the EGR cooler 19, and a refrigerant discharge pipe 23 returning the cooling water to the engine 11 after circulating the EGR cooler 19 and cooling the EGR gas. It is also provided with a refrigerant valve 24 opening and closing the refrigerant supply pipe 22, a rotation sensor 28 detecting a rotational speed of the engine, a temperature sensor 27 detecting temperature of exhaust gas passing the exhaust manifold 14, and a controller 46 controlling an opening of the refrigerant valve 24 on the basis of detection outputs of the temperature sensor 27 and the rotation sensor 28.
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