| 摘要 |
<P>PROBLEM TO BE SOLVED: To supply an additive to a catalyst more evenly. <P>SOLUTION: An exhaust emission control device of an internal combustion engine includes a supply part 4 arranged in an exhaust passage 2 in the upstream of an exhaust purification catalyst 3, and supplying the additive to the exhaust purification catalyst 3, and a dispersion part 5 arranged between the exhaust purification catalyst 3 and the supply part 4, and dispersing the additive. The exhaust passage 2 includes an enlarged part 21 with its cross-sectional area enlarged toward the downstream side in the downstream side of the dispersion part 5 and the upstream side of the exhaust purification catalyst 3. The enlarged part 21 includes a first enlarged part 211 enlarged at a first prescribed angle θ1, and a second enlarged part 212 enlarged at a second prescribed angle θ2 larger than the first prescribed angle θ1 in the downstream side of the first enlarged part 211. The first enlarged part 211 and the second enlarged part 212 are formed so that distances L1, L2 from a border 213 between the first enlarged part 211 and the second enlarged part 212 to the exhaust purification catalyst 3 become short at a place L2 small in an exhaust flow rate compared to a place L1 large in the exhaust flow rate. <P>COPYRIGHT: (C)2013,JPO&INPIT |
