EP 2104782 A1 20090930 - EXHAUST EMISSION CONTROL SYSTEM FOR LEAN ENGINES AND METHOD FOR OPERATING THE SYSTEM
Title (en)
EXHAUST EMISSION CONTROL SYSTEM FOR LEAN ENGINES AND METHOD FOR OPERATING THE SYSTEM
Title (de)
ABGASREINIGUNGSANLAGE FÜR MAGERMOTOREN UND VERFAHREN ZUM BETREIBEN DER ANLAGE
Title (fr)
INSTALLATION D'ÉPURATION DES GAZ D'ÉCHAPPEMENT POUR MOTEURS À MÉLANGE PAUVRE ET PROCÉDÉ DE MISE EN UVRE DE L'INSTALLATION
Publication
Application
Priority
- EP 2007011319 W 20071221
- EP 06026858 A 20061223
- EP 07857042 A 20071221
Abstract (en)
[origin: WO2008077602A1] An exhaust emission control system for controlling the emission of exhaust gases of a lean engine with several cylinders contains a first exhaust pipe (3) for the exhaust gases of a first group of cylinders (2) and a second exhaust pipe (31) for the exhaust gases of a second group of cylinders (2'). A nitrogen oxide storage catalyst (6, 6') is disposed in each exhaust pipe. Downstream from the storage catalysts, the two exhaust pipes are united at an opening to a common exhaust pipe (5). The common exhaust pipe contains an SCR catalyst (7). The first and second groups of cylinders are periodically supplied opposite to each other alternately with a lean and a fat air/fuel mixture. Accordingly, lean or fat exhaust gases are produced in the cylinders during combustion and are emitted to the corresponding exhaust pipes. Lean and fat exhaust gases are matched to one another in such a way that, after the exhaust gases are brought together in the common exhaust pipe, a lean exhaust gas results. During the regeneration of the storage catalysts, ammonium may be formed, stored by the SCR catalyst, and reacted with nitrogen oxides which unintentionally pass through the storage catalysts during the storage phase.
IPC 8 full level
F02D 41/02 (2006.01); F01N 3/08 (2006.01); F02D 41/34 (2006.01)
CPC (source: EP KR US)
F01N 3/08 (2013.01 - KR); F01N 3/0814 (2013.01 - EP US); F01N 3/0842 (2013.01 - EP US); F01N 3/0871 (2013.01 - EP US); F01N 3/20 (2013.01 - KR); F01N 3/2073 (2013.01 - EP US); F01N 13/009 (2014.06 - EP US); F01N 13/0097 (2014.06 - EP US); F01N 13/011 (2014.06 - EP US); F02D 41/0082 (2013.01 - EP US); F02D 41/02 (2013.01 - KR); F02D 41/0275 (2013.01 - EP US); F02D 41/34 (2013.01 - KR); F01N 2570/18 (2013.01 - EP US); F01N 2610/03 (2013.01 - EP US); Y02T 10/12 (2013.01 - EP US)
Citation (search report)
See references of WO 2008077602A1
Citation (examination)
WO 2004061278 A1 20040722 - DAIMLER CHRYSLER AG [DE], et al
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2008077602 A1 20080703; BR PI0721036 A2 20140729; CA 2673628 A1 20080703; EP 2104782 A1 20090930; JP 2010514968 A 20100506; KR 20090094466 A 20090907; US 2010037597 A1 20100218
DOCDB simple family (application)
EP 2007011319 W 20071221; BR PI0721036 A 20071221; CA 2673628 A 20071221; EP 07857042 A 20071221; JP 2009541903 A 20071221; KR 20097015405 A 20071221; US 51998907 A 20071221