| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To enable more efficient and prompt regeneration of a particulate filter than a conventional manner. <P>SOLUTION: A method for keeping an oxidation catalyst 14 in the front stage of the particulate filter 13 mounted halfway in an exhaust pipe 11 in a diesel engine 1 and for forcibly regenerating the particulate filter 13 by adding a fuel in exhaust gas 9 on the upstream side from the oxidation catalyst 14 and burning collected particulates in the particulate filter 13 in the rear stage by reaction heat when oxidation reaction of the added fuel occurs on the oxidation catalyst 14 in the front stage, executes premixed compression ignition by lowering an air exceeding rate than usual when an accelerator is off during engine operation to raise floor temperatures of the oxidation catalyst 14 and particulate filter 13 through the increase in the exhaust temperature thereby. Thereafter, the air exceeding rate is returned to the vicinity of the normal level to shift to the forcible regeneration by fuel addition. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
