EP 1198666 A1 20020424 - METHOD FOR INCREASING THE NO x CONVERSION RATE OF DETERIORATED NO x STORAGE CATALYSTS
Title (en)
METHOD FOR INCREASING THE NO x CONVERSION RATE OF DETERIORATED NO x STORAGE CATALYSTS
Title (de)
VERFAHREN ZUR ERHÖHUNG DER NO x-UMSATZRATE VON GESCHÄDIGTEN NO x-SPEICHERKATALYSATOREN
Title (fr)
PROCEDE POUR ACCROITRE LE TAUX DE CONVERSION DE NO x DE CATALYSEURS ACCUMULATEURS DE NO x ALTERES
Publication
Application
Priority
- DE 19926148 A 19990609
- EP 0004808 W 20000526
Abstract (en)
[origin: DE19926148A1] Disclosed is a method for compensating deterioration or ageing of NOx storage catalysts by specifically increasing the NOx conversion rate in accordance with a specific excess consumption threshold value. According to extent of damage ascertained, the following measures are proposed either individually or in a combined manner so that the catalyst can be used over a longer period without being replaced: modification of the lean-rich operation period until NOx regeneration or desulphation is initiated or terminated; constant or chronologically variable off-setting to the lambda-input of a fresh NOx storage catalyst while NOx regeneration or desulphation is carried out to a maximum extent of <u>+</u> 0.25; modification of the exhaust gas recirculation rate, ignition point, start of injection, duration of injection, tumble valve position, valve control times, compression and/or supercharging pressure in order to reduce lean NOx raw emission in accordance with certain marginal conditions for exhaust gas temperature, exhaust gas mass flow and HC or CO emission rate; extension of the operating mode, with lambda = 1, to characteristic mapping ranges wherein lean operation is possible for a non-deteriorated catalyst.
IPC 1-7
IPC 8 full level
F02D 43/00 (2006.01); B01D 53/94 (2006.01); F01N 3/06 (2006.01); F01N 3/08 (2006.01); F01N 3/20 (2006.01); F01N 3/24 (2006.01); F01N 3/28 (2006.01); F02D 15/00 (2006.01); F02D 21/08 (2006.01); F02D 23/00 (2006.01); F02D 29/02 (2006.01); F02D 41/02 (2006.01); F02D 41/04 (2006.01); F02D 45/00 (2006.01); F02M 25/07 (2006.01)
CPC (source: EP)
F01N 3/0842 (2013.01); F01N 3/0871 (2013.01); F01N 3/0885 (2013.01); F02D 41/0235 (2013.01); F02D 41/028 (2013.01); F01N 2430/04 (2013.01); F01N 2430/06 (2013.01); F01N 2430/10 (2013.01); F01N 2570/04 (2013.01); F02M 26/15 (2016.02)
Citation (search report)
See references of WO 0077371A1
Citation (examination)
- EP 0733786 A2 19960925 - TOYOTA MOTOR CO LTD [JP]
- US 5778666 A 19980714 - CULLEN MICHAEL JOHN [US], et al
Designated contracting state (EPC)
DE FR IT
DOCDB simple family (publication)
DE 19926148 A1 20001214; EP 1198666 A1 20020424; JP 2003502554 A 20030121; WO 0077371 A1 20001221
DOCDB simple family (application)
DE 19926148 A 19990609; EP 0004808 W 20000526; EP 00929557 A 20000526; JP 2001503797 A 20000526