EP 2013455 A1 20090114 - EXHAUST GAS PURIFICATION DEVICE FOR INTERNAL COMBUSTION ENGINE
Title (en)
EXHAUST GAS PURIFICATION DEVICE FOR INTERNAL COMBUSTION ENGINE
Title (de)
ABGASREINIGUNGSVORRICHTUNG FÜR EINEN VERBRENNUNGSMOTOR
Title (fr)
ÉPURATEUR DE GAZ D'ÉCHAPPEMENT POUR MOTEUR À COMBUSTION INTERNE
Publication
Application
Priority
- JP 2007059435 W 20070426
- JP 2006123785 A 20060427
Abstract (en)
[origin: WO2007126140A1] A NOx absorbent is arranged in an exhaust passage of an internal combustion engine, and a fuel supply valve (28) is arranged in the exhaust passage upstream of the NOx absorbent. If the temperature of the NOx absorbent is lower than a predetermined temperature when the NOx must be released from the NOx absorbent, the air-fuel ratio of exhaust gas flowing through the NOx absorbent is first switched from a basic lean air-fuel ratio to and maintained at a lean air-fuel ratio with a lower leanness for a predetermined lean time, and is then switched to a rich air-fuel ratio. If the temperature of the NOx absorbent is higher than the predetermined temperature when the NOx must be released from the NOx absorbent, the air-fuel ratio of the exhaust gas flowing through the NOx absorbent is switched to the rich air-fuel ratio without being switched to the lean air-fuel ratio with a lower leanness.
IPC 8 full level
F01N 3/08 (2006.01); F02D 41/02 (2006.01)
CPC (source: EP US)
F01N 3/0842 (2013.01 - EP US); F01N 3/0871 (2013.01 - EP US); F02D 41/024 (2013.01 - EP US); F02D 41/0275 (2013.01 - EP US); F01N 2250/14 (2013.01 - EP US); F01N 2610/03 (2013.01 - EP US); F02B 37/00 (2013.01 - EP US); F02D 2200/0802 (2013.01 - EP US); Y02T 10/12 (2013.01 - EP US)
Citation (search report)
See references of WO 2007126140A1
Designated contracting state (EPC)
DE FR GB
Designated extension state (EPC)
AL BA HR MK RS
DOCDB simple family (publication)
WO 2007126140 A1 20071108; CN 101427010 A 20090506; EP 2013455 A1 20090114; JP 2007297918 A 20071115; US 2009049825 A1 20090226
DOCDB simple family (application)
JP 2007059435 W 20070426; CN 200780014582 A 20070426; EP 07742870 A 20070426; JP 2006123785 A 20060427; US 22499707 A 20070426