| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technique for promoting warming of an internal combustion engine by recovering waste heat from exhaust emission to engine cooling water by a low-pressure EGR cooler to thereby warm the engine cooling water in an exhaust recirculation device for internal combustion engine. <P>SOLUTION: When the temperature of the engine cooling water is a predetermined temperature T1 or lower, an exhaust throttle valve 11 is controlled to close side, and a low-pressure EGR valve 32 is controlled to close side. According to this, the exhaust emission flowing in an exhaust passage 4 flows into the upstream side of a low-pressure EGR passage 31, as shown by the arrow in the drawing, to pass through the low-pressure EGR cooler 33, and is carried from the cooler 33 to an exhaust communication passage 50, and discharged again to the exhaust passage 4. Consequently, the waste heat from the exhaust emission can be recovered to the engine cooling water by the cooler 33 to warm the engine cooling water. <P>COPYRIGHT: (C)2008,JPO&INPIT |
