| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a device suppressing HC discharged to the downstream of an NO<SB POS="POST">X</SB>trap catalyst even in a layout provided with a filter on the upstream side of an exhaust channel and the NO<SB POS="POST">X</SB>trap catalyst on the downstream side of the exhaust channel. <P>SOLUTION: In an exhaust post-processing device for a diesel engine provided with the filter (13) on the upstream side of the exhaust channel and the NO<SB POS="POST">X</SB>trap catalyst (15) on the downstream side of the exhaust channel and executing a rich spike process making an excess air ratio of exhaust basic target excess air ratio, the excess air ratio equivalent to or less than a theoretical air-fuel ratio being made the basic target excess air ratio, when regeneration timing of the NO<SB POS="POST">X</SB>trap catalyst (15) comes, provided is an excess air ratio correction means (53) correcting the basic target excess air ratio in the rich spike process to the increasing side in the operation range in which SOF is generated comparatively much. <P>COPYRIGHT: (C)2013,JPO&INPIT |
