EP 1209332 A3 20040609 - Method and apparatus for regenerating a NOx storage catalyst

Title (en)

Method and apparatus for regenerating a NOx storage catalyst

Title (de)

Verfahren und Vorrichtungen zur Regeneration eines NOx-Speicherkatalysators

Title (fr)

Méthode et appareil de régénération d'un catalyseur accumulateur de NOx

Publication

EP 1209332 A3 20040609 (DE)

Application

EP 01250407 A 20011121

Priority

DE 10057936 A 20001122
DE 10057938 A 20001122

Abstract (en)

[origin: EP1209332A2] Process for regenerating a NOx storage catalyst (18) arranged in the exhaust gas channel (14) of a lean-burn I.C. engine comprises extrapolating an oxygen-dependent signal from an oxygen-sensitive measuring device (20) during NOx regeneration; and varying an air-fuel ratio (combustion lambda) fed to the engine during regeneration depending on the extrapolated signal with consideration of a time spread corresponding to an exhaust gas running time between the engine and the catalyst. An Independent claim is also included for a device for regenerating a NOx storage catalyst arranged in the exhaust gas channel of a lean-burn I.C. engine. Preferred Features: The end of the regeneration is determined whilst a time spread corresponding to an exhaust gas running time between the engine and the catalyst is considered. The combustion lambda of the engine peaks at a value which is larger than a prescribed combustion lambda value and 1.

IPC 1-7

F02D 41/02; F01N 3/08; F02D 41/14

IPC 8 full level

F01N 3/08 (2006.01); F02D 41/02 (2006.01); F02D 41/14 (2006.01); F01N 13/02 (2010.01)

CPC (source: EP)

F01N 3/0814 (2013.01); F01N 13/009 (2014.06); F02D 41/0275 (2013.01); F02D 41/1439 (2013.01); F01N 3/0842 (2013.01); F02D 41/1454 (2013.01); F02D 2200/0804 (2013.01); F02D 2200/0806 (2013.01); F02D 2200/0814 (2013.01); F02D 2200/0816 (2013.01)

Citation (search report)

[XA] JP H0814031 A 19960116 - HITACHI LTD
[X] DE 19844082 C1 19991014 - SIEMENS AG [DE]
[A] EP 0940570 A1 19990908 - FORD GLOBAL TECH INC [US]
[A] DE 19915793 A1 20001019 - DAIMLER CHRYSLER AG [DE]
[A] EP 0997626 A1 20000503 - RENAULT [FR]
[A] WO 9943420 A1 19990902 - VOLKSWAGEN AG [DE], et al

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

DOCDB simple family (publication)

EP 1209332 A2 20020529; EP 1209332 A3 20040609; EP 1209332 B1 20080625; EP 1209332 B8 20080813; DE 50114044 D1 20080807

DOCDB simple family (application)

EP 01250407 A 20011121; DE 50114044 T 20011121