| 摘要 |
PROBLEM TO BE SOLVED: To perform normal EGR as soon as possible by promoting a temperature rise of engine cooling water of an engine immediately after starting the engine. SOLUTION: An EGR passage 5 makes a part of exhaust circulate, which exhaust is made to flow from an exhaust passage 4 to an intake passage 2 of an engine 1. An EGR cooler 7 is arranged on the EGR passage 5 for cooling EGR gas by utilizing engine cooling water. A heat accumulator 12 is arranged on the way of a cooling water introduction passage 8 which introduces the engine cooling water to the EGR cooler 7, for keeping the cooling water under heat accumulation during stopping the engine. A bypass passage 10 and a changeover valve 11 are arranged for making at least a part of the engine cooling water bypass the EGR cooler 7 immediately after starting the engine. |
