| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce a regeneration time of a filter without damaging a particulate filter due to excess temperature rising or without deteriorating an oxidation catalyst carried by the filter. <P>SOLUTION: When an operation state of the engine is in a post injection execution region, and it is determined that a pressure difference by upstream side and downstream side pressure sensors arranged with the filter interposed therebetween is more than a predetermined valueα1, a post injection is executed with a regeneration initial mode. When a temperature difference tf-tr between a temperature tf by a second exhaust temperature sensor and a temperature tr by a third exhaust temperature sensor becomes not more than a reference temperature differenceΔt, an injection mode is changed to a regeneration later state mode. In the regeneration later stage mode, an injection amount is reduced or an injection timing is advanced compared with the regeneration initial mode. Further, when the pressure difference becomes less than a predetermined valueα2, the post injection, that is, regeneration is terminated. <P>COPYRIGHT: (C)2004,JPO</p> |
