| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide technology for suppressing worsening of emission caused by NOx reduction treatment in an exhaust emission control system constituted by combining a plurality of branched passages branched from an exhaust passage with NOx catalyst provided in each branched passage. <P>SOLUTION: In this exhaust emission control system provided with NOx catalyst, a reducing agent adding means, and a flow rate control valve in each branched passage, NOx and/or reducing agent are introduced into another NOx catalyst 111b when NOx and/or reducing agent are discharged from the NOx catalyst 110a, 111a in accordance with NOx reduction treatment for the NOx catalyst 110a, 111a in the branched passage in a part. <P>COPYRIGHT: (C)2007,JPO&INPIT |
