| 摘要 |
<P>PROBLEM TO BE SOLVED: To effectively eliminating NOx in exhaust gas even when the temperature of exhaust gas is relatively low. <P>SOLUTION: An exhaust emission control device is equipped with a diesel particulate filter 22 provided to an exhaust pipe 16 of a diesel engine 11, a filter temperature increasing means for allowing an increase in temperature of the diesel particulate filter 22 to a predetermined value or higher, an injection nozzle 29 provided to the exhaust pipe 16 on an exhaust gas upstream side from the diesel particulate filter 22, and a urea liquid injection means 30 which can injects urea liquid 32 in exhaust gas inside the exhaust pipe 16 through the medium of the injection nozzle 29. It is preferable that a selective reduction type catalyst 56 is provided to the exhaust pipe 16 on the exhaust gas downstream side from the diesel particulate filter 22 and that an oxidation catalyst 53 is provided to the exhaust pipe 16 on the exhaust gas upstream side from the injection nozzle 29. <P>COPYRIGHT: (C)2007,JPO&INPIT |
