| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide technology making a catalyst suitably recover exhaust gas control capacity while avoiding excessive temperature rise of the catalyst and a filter in an exhaust emission control device for an internal combustion engine. <P>SOLUTION: Flow rate of exhaust gas flowing into NSR and DPF is reduced as compared to that before execution of S regeneration or is set to zero when S regeneration is executed by adding fuel from a fuel addition valve arranged in an exhaust gas passage at an upstream side of NSR and DPF, and flow rate of exhaust gas flowing into NSR and DPF is increased as compared to that during execution of S regeneration when S regeneration is completed. <P>COPYRIGHT: (C)2010,JPO&INPIT |
