| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide technology for efficiently supplying additive to a small sized catalyst from an addition valve, while avoiding soot from accumulating around the addition valve, in an exhaust gas passage structure for an internal combustion engine. <P>SOLUTION: A small-sized catalyst 3 disposed separately from an inner wall surface of an exhaust gas passage 2, an addition valve passage 4 disposed at an outside of the exhaust gas passage 2 and opening to an inside of the exhaust gas passage 2, a fuel addition valve 5 disposed in the addition valve passage 4 and adding fuel to the small sized catalyst 3, and a tubular member 6 hollow in an exhaust gas flow direction connected to an exhaust gas flow direction of the small sized catalyst 3, are included in the exhaust gas passage 2 for an internal combustion engine. A fuel inlet section 7, which is a hole for introducing fuel added from the fuel addition valve 5 into the tubular member 6 is disposed at a part of the tubular member 6, crossing an addition orientation direction of fuel added initially from the fuel addition valve 5 in the addition valve passage 4. <P>COPYRIGHT: (C)2011,JPO&INPIT |
