| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device for an internal combustion engine, enabling to introduce high-temperature and high-pressure exhaust gas into an additive injection passage while suppressing the thermal load of an additive injection valve. <P>SOLUTION: The exhaust emission control device for the internal combustion engine comprises an exhaust gas passage 32 for guiding part of exhaust gas from an exhaust manifold 1a of the engine 1 to the additive injection passage 24b in which the additive injection valve 23 is installed, and a gas introduction control valve 35 provided in the exhaust gas passage 32 for opening/closing the exhaust gas passage 32. In this construction, high-pressure exhaust gas is introduced into the additive injection passage 24b as necessary for the event that deposits may be formed. This minimizes the exposure of the additive injection valve 23 to the high-temperature and high-pressure exhaust gas. <P>COPYRIGHT: (C)2009,JPO&INPIT |
