EP 1469180 B1 20190123 - Method for managing NOx catalyst
Title (en)
Method for managing NOx catalyst
Title (de)
Verfahren zur Regelung eines NOx-Speicherkatalysators
Title (fr)
Procédé de contrôle d'un pot catalytique à accumulation de NOx
Publication
Application
Priority
- JP 2003110046 A 20030415
- JP 2003320029 A 20030911
Abstract (en)
[origin: EP1469180A2] In a diesel engine, prior to a sulfur discharging process, a pre-process is performed to decrease the air-fuel ratio of the air-fuel mixture that is to be burned in the engine so that the air-fuel ratio A/FEHT of the exhaust gas reaches a predetermined pre-process value alpha . The time required for the air-fuel ratio A/FEHT of the exhaust gas to stabilize near the pre-process value alpha is set as a stand-by time TS. The sulfur discharging process starts after the stand-by time elapses. This enhances the convergence of the air-fuel ratio A/FEHT to the target value during the sulfur discharging process. If a predetermined condition is satisfied, the stand-by time is cancelled to start the sulfur discharging process when or just after the pre-process is started. This efficiently processes the sulfur components accumulated in a NOx storage catalyst, which is arranged in an exhaust passage of the engine, without deteriorating the exhaust gas property. <IMAGE>
IPC 8 full level
F01N 3/08 (2006.01); F01N 3/20 (2006.01); F01N 3/24 (2006.01); F02D 21/08 (2006.01); F02D 41/00 (2006.01); F02D 41/02 (2006.01); F02D 41/04 (2006.01); F02D 41/14 (2006.01); F02D 41/30 (2006.01); F02D 43/00 (2006.01); F02D 45/00 (2006.01); F02M 25/07 (2006.01)
CPC (source: EP)
F02D 41/0275 (2013.01); F02D 41/028 (2013.01); F02D 41/1463 (2013.01); F02D 41/0055 (2013.01); F02D 41/3035 (2013.01)
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
EP 1469180 A2 20041020; EP 1469180 A3 20050525; EP 1469180 B1 20190123; ES 2712136 T3 20190509; JP 2004332712 A 20041125; JP 4276910 B2 20090610
DOCDB simple family (application)
EP 04008984 A 20040415; ES 04008984 T 20040415; JP 2003320029 A 20030911