| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust gas treating system reducing abrupt change of engine sound when shifting to regeneration control of a DPF or returning from the regeneration control. <P>SOLUTION: In the exhaust gas treating system 10 with the DPF 35 for exhaust gas provided in an exhaust passage 13, the throttle opening degree S of an intake throttle valve 20 in a throttling process from a normal opening degree Sn to a regeneration opening degree Sb and in a returning process from the regeneration opening degree Sb to a normal opening degree Sd is composed of a normal opening degree variation rate Rn and a transient opening degree variation rate Rt, which gradually decrease or gradually increase in a predetermined time. <P>COPYRIGHT: (C)2011,JPO&INPIT |
