| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technology capable of further diffusing a reducing agent, in an exhaust emission control device of an internal combustion engine. <P>SOLUTION: This exhaust emission control device has a catalyst arranged in an exhaust passage of the internal combustion engine, and a reducing agent supply device 5 arranged in the exhaust passage on the upstream side of the catalyst and supplying the reducing agent in exhaust gas. The exhaust passage is constituted of a double structure 20 of an inside passage 21 and an outside passage 22 surrounding the inside passage 21 in at least a part of the exhaust passage on the upstream side of the catalyst. The exhaust gas respectively flows to the inside passage 21 and the outside passage 22, and at least a part of the outside passage 22 is a passage for spirally turning around the inside passage 21, and the reducing agent supply device 5 supplies the reducing agent in the outside passage 22. <P>COPYRIGHT: (C)2009,JPO&INPIT |
