To promote vaporization of a liquid additive containing components promoting cleaning action of exhaust gas, while avoiding enlargement of an exhaust emission control device provided with a catalyst cleaning the exhaust gas.
This exhaust emission control device comprises: an addition valve 24 supplying the liquid additive to a catalyst 23; and an air supply passage 51 branched from backwash of a compressor 311 of a turbocharger 31 in an intake pipe 11 to discharge a part of intake air to the addition valve 24. When it is determined that regeneration of the catalyst 23 is required, an intake throttle valve 13 is operated on a side closed more than the intake throttle valve 13 before the start of the regeneration. Since high pressure between the compressor 311 of the turbocharger 31 and the intake throttle valve 13 is maintained during regeneration of the catalyst 23, the high-pressure air can be stably discharged to the addition valve 24 during the regeneration. Therefore, the tank used for storing the high-pressure air in a conventional device can be eliminated.
COPYRIGHT: (C)2008,JPO&INPIT
Kojima Showa
| JP8200047A | ||||
| JP2001207836A | ||||
| JP2003201828A | ||||
| JP2003343245A | ||||
| JP11512165A |
| WO2005095767A1 |
Takahiro Miura
Fumihiro Mizuno