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1. (WO2001006106) METHOD AND DEVICE FOR DESULFATING A NOX ACCUMULATOR CATALYST

Pub. No.:    WO/2001/006106    International Application No.:    PCT/EP2000/006517
Publication Date: Fri Jan 26 00:59:59 CET 2001 International Filing Date: Tue Jul 11 01:59:59 CEST 2000
IPC: B01D 53/94
F01N 3/08
F01N 3/20
F01N 3/28
F01N 5/02
F02D 41/02
F02D 41/40
F01N 13/02
F01N 13/04
F01N 3/22
F01N 3/30
F01N 3/32
Applicants: DR. ING. H.C.F. PORSCHE AKTIENGESELLSCHAFT
AUDI AKTIENGESELLSCHAFT
BAYERISCHE MOTOREN WERKE AKTIENGESELLSCHAFT
VOLKSWAGEN AKTIENGESELLSCHAFT
DAIMLERCHRYSLER AG
COUTSOCHRISTOS, Christos
HUYNH, Ngoc-Hoa
DEGEN, Alf
SALZER, Lorenz
GERL, Peter
Inventors: COUTSOCHRISTOS, Christos
HUYNH, Ngoc-Hoa
DEGEN, Alf
SALZER, Lorenz
GERL, Peter
Title: METHOD AND DEVICE FOR DESULFATING A NOX ACCUMULATOR CATALYST
Abstract:
The invention relates to a method for desulfating an NOx accumulator catalyst (4) in the exhaust gas system of an internal combustion engine (1) with direct injection. Said method comprises the following stages: Executing a retarded injection into the exhaust gas during the exhaust cycle of the internal combustion engine (1) in a desulfation mode and supplying an excess of oxygen to the exhaust gas in the desulfation mode, in such a way that post-combustion occurs in the NOx accumulator catalyst (4) to aid desulfation.