| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control system for an internal combustion engine capable of preventing clogging in a nozzle hole of a reducer loading valve and suppressing an increase in temperature of the reducer loading valve. <P>SOLUTION: In the exhaust emission control system provided with an exhaust pipe 5 in which a branched exhaust pipe 12R having a turbine 10b of a main turbosupercharger 10 and a branched exhaust pipe 12L having a turbine 11b of a sub turbosupercharger 11 merge at a merged part 13a and an exhaust switch valve 16 opening and closing the branched exhaust pipe 12L, and applied to the internal combustion engine 1 closing the exhaust switch valve 16 in a prescribed operating area and preventing a flow of exhaust gas flowing into the merged part 13a through the branched exhaust pipe 12L, a regenerative exhaust emission control unit 15 and a fuel adding valve 17 are provided. The fuel loading valve 17 is provided at the merged part 13a so that the high-speed exhaust gas can hit against a periphery of an injection port 17a when opening of the exhaust switch valve 16 is small and flow speed of the exhaust gas passing through the exhaust switch valve 16 is high. <P>COPYRIGHT: (C)2008,JPO&INPIT |
