| 摘要 |
PROBLEM TO BE SOLVED: To provide a regeneration time-deciding device for a particulate filter capable of precisely deciding the regeneration time of a filter at all times. SOLUTION: When the volumetric efficiency of an engine is lowered with increase of the scavenging amount of particulates ((1) to (3) in Fig.), an EGR amount (EGR) is reduced in order to secure a required air amount to keep a previous target air/fuel ratio resulting in the increase of a cylinder intake fresh air amount. Considering such a fact, when the cylinder intake fresh air amount An exceeds a reference intake fresh air amount An0 corresponding to the operation condition of the engine, it is decided that a DPF (diesel particulate filter) is at a time to be regenerated and thus, the control for forcible regeneration is carried out. |
