| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an EGR cooler preventing misfire of an internal combustion engine and improving drivability by stabilizing temperature of cooling water supplied to the EGR cooler. <P>SOLUTION: In the EGR cooler system X cooling part of exhaust gas re-circulated to an intake air passage 12 by a water cooled EGR cooler 22, cooling water supplied to the EGR cooler is cooled by a sub radiator 31 in a separate path different from a main radiator. The system is provided with an electric water pump 32 circulating cooling water to a cooling water path 3 of the sub radiator, a bypass passage 33 bypassing the sub radiator, a water temperature sensor 35 detecting temperature of cooling water at a cooling water outlet 22b of the EGR cooler, and an electric flow control valve 34 controlling bypass quantity of cooling water to the bypass passage based on output signal from the water temperature sensor. <P>COPYRIGHT: (C)2007,JPO&INPIT |
