| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce the consumed amount of the fuel supplied from a fuel feed valve. <P>SOLUTION: A small-sized oxidation catalyst 14, a particulate filter 13, and an NOx storage catalyst 17 are disposed in an engine exhaust passage. A sulfur poisoning detoxication treatment for detoxicating the sulfur poisoning of the small-sized oxidation catalyst 14 by supplying a reducer from a reducer supply valve 15, an SOx release treatment for releasing SOx from the NOx storage catalyst 17, and a regenerating treatment for regenerating the particulate filter 13 are performed in the exhaust emission control device. The frequency of the sulfur poisoning detoxication treatment is higher than the total frequency of the frequency at which the SOx release treatment is performed and the frequency at which the regenerating treatment is performed. <P>COPYRIGHT: (C)2009,JPO&INPIT |
