| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device capable of maintaining both of target exhaust gas temperature at an upstream of a catalyst and target catalyst temperature during filter regeneration process even if time degradation occurs. <P>SOLUTION: This exhaust emission control device performs post injection using a fuel injection valve during exhaust stroke or expansion stroke right after main injection using the fuel injection valve 9 to perform regeneration process of a filter 13 when regeneration timing of the filter 13 comes. The device is provided with a means 25 detecting temperature of the catalyst 14, a means 21 calculating base post injection quantity and base post injection timing of post injection according to operation conditions, a catalyst temperature rise speed calculation means 21 calculating catalyst temperature rise speed based on catalyst temperature detected after start of regeneration process of the filter by performing post injection, and a means 21 correcting base post injection timing of the post injection to match the calculated catalyst temperature rise speed to base catalyst temperature rise speed. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
