| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To bring a bed temperature of a filter near a permissible maximum temperature even if an intake fresh air flow rate is limited at a fresh air flow rate limit. <P>SOLUTION: This exhaust emission control device of an engine comprises the filter (41) for collecting particulates in an exhaust passage (2), and performs renewal of the filter when the filter (41) is renewed. In the case of oxygen concentration control of which a targeted oxygen concentration during exhaust is set to a high concentration at late renewal treatment is performed by an intake fresh air flow rate control, when the intake fresh air flow rate is limited at the fresh air flow rate limit, an intake fresh air flow rate increase and decrease repeating control means (31, 42) is provided to perform repetitive control of increases and the decreases in the intake fresh air flow rate. <P>COPYRIGHT: (C)2004,JPO&NCIPI</p> |
