| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an exhaust gas recirculating device of an engine capable of preventing reduction in an acceleration response of the engine even in an engine light load, while providing the sufficient NOx improving effect. <P>SOLUTION: This exhaust gas recirculating device has a high load time EGR passage 53 arranging an oxidation catalyst 37 on the exhaust passage downstream side of a turbine 35 of a turbocharger 23 and recirculating exhaust gas to the intake passage upstream side of a compressor 25 of the turbocharger 23 from the further exhaust passage downstream side of this oxidation catalyst 37, a low load time EGR passage 55 for recirculating the exhaust gas to the intake passage downstream side of the compressor 25 of the turbocharger 23 from the exhaust passage downstream side of the oxidation catalyst 37, and a switching valve 63 for switching the high load time EGR passage 53 and the low load time EGR passage 55 so as to recirculate the exhaust gas from the high load time EGR passage 53 when an engine 1 is operated by a predetermined load or more and recirculate the exhaust gas from the low load time EGR passage 55 when the engine 1 is operated in less than the predetermined load. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
