| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To accurately determine a regenerating timing for a particulate filter (DPF). <P>SOLUTION: In the computation of a PM amount executed by an ECU 51, accumulation property which specifies increase property for pressure loss to increase with the PM accumulated amount in DPF 32 is represented by a front stage property line ranging from an initial point where an inclination is gentile beyond a transition point to the transition point and a rear stage property line ranging from the transition point. The accumulated amount is calculated from the pressure loss in accordance with the accumulation property. When the accumulated amount gets to a regeneration required value, regeneration is executed. When an accumulated condition in the particulate filter is changed with the combustion of exhaust gas particulates and the accumulation property appears which tracks back an accumulated amount decaying property line from a point on the rear stage property line through the initial point toward a surface layer portion accumulation property line represented by a straight line having the same inclination as the rear stage property line, during a time before transition to the surface layer portion accumulation property line is completed, the regeneration required value is made smaller with the accumulated exhaust gas particulates being in a combustion condition, avoiding too much delay of a regeneration timing. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
