| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technique that prevents exhaust from entering from an exhaust communicating conduit, bypassing a low-pressure EGR cooling device and being recirculated in an air intake passage when the low-pressure EGR gas is recirculated in the air intake passage without providing a new shut-off valve in an exhaust gas recirculating device for an internal combustion engine. <P>SOLUTION: The device includes: the low-pressure EGR cooling device 20 using an engine cooling water; the exhaust communicating conduit 22; an exhaust throttle valve 13 that can open and close the exhaust communicating passage 22 and adjust the quantity of the exhaust circulating the exhaust passage 10 while the exhaust communicating passage is closed, and keeps an exhaust passage 10 closed while the exhaust communicating passage 22 is opened; and an ECU 23 that closes the exhaust passage 10 by the exhaust throttle valve 13 when a temperature TWH of the engine cooling water is lower than a predetermined temperature T1, which is a threshold determining whether warming up the internal combustion engine 1 is required in an early stage. <P>COPYRIGHT: (C)2012,JPO&INPIT |
