| 摘要 |
<P>PROBLEM TO BE SOLVED: To surely carry out the regeneration of a filter 13 while preventing the worsening of fuel economy in an exhaust emission control device for an engine with an NOx catalyst 11, an oxidation catalyst 12 and the filter 13 arranged in this order from the exhaust upstream side toward the downstream side. <P>SOLUTION: An exhaust passage of the engine 2 is branched upstream of the NOx catalyst 11 into a first passage 27 that leads exhaust to the NOx catalyst and into a second passage 28 that leads exhaust to the oxidation catalyst 12 without passing through the NOx catalyst 11. A control valve 29 is provided in the exhaust passage, and the flow rate ratio of the flow rate of exhaust flowing into the first passage 27 to the flow rate of exhaust flowing into the second passage 28 can be changed by the control valve 29. <P>COPYRIGHT: (C)2013,JPO&INPIT |
