Global Patent Index - EP 3717757 B1

EP 3717757 B1 20211006 - METHOD FOR OPERATING AN EXHAUST AFTERTREATMENT SYSTEM OF AN INTERNAL COMBUSTION ENGINE AND EXHAUST AFTERTREATMENT SYSTEM

Title (en)

METHOD FOR OPERATING AN EXHAUST AFTERTREATMENT SYSTEM OF AN INTERNAL COMBUSTION ENGINE AND EXHAUST AFTERTREATMENT SYSTEM

Title (de)

VERFAHREN ZUM BETREIBEN EINER ABGASNACHBEHANDLUNGSANLAGE EINER BRENNKRAFTMASCHINE UND ABGASNACHBEHANDLUNGSANLAGE

Title (fr)

PROCÉDÉ D'OPÉRATION D'UN SYSTÈME DE POST-TRAITEMENT D'UN MOTEUR À COMBUSTION INTERNE ET SYSTÈME DE POST-TRAITEMENT

Publication

EP 3717757 B1 20211006 (DE)

Application

EP 18808321 A 20181123

Priority

  • DE 102017221358 A 20171129
  • DE 102018215627 A 20180913
  • EP 2018082357 W 20181123

Abstract (en)

[origin: WO2019105859A1] The invention relates to a method for operating an exhaust gas aftertreatment system of an internal combustion engine and to a corresponding exhaust gas aftertreatment system. The method relates to the checking of an SCR particle filter (3) of the exhaust gas aftertreatment system for functional capability with respect to the filtering effect of the SCR particle filter and NOx/NH3 conversion by causing a defined NOx and/or ΝH3 concentration change upstream of the SCR particle filter (3) and, in a defined time frame (TW) immediately following said concentration change, measuring the NOx and/or NH3 concentration change downstream of the SCR particle filter (3) and, on the basis thereof, providing a concentration comparison value (VgW). On the basis of a comparison of the concentration comparison value (VgW) with predefined limit values (GW), the SCR particle filter (3) is then diagnosed as faulty if the concentration comparison value (VgW) has exceeded at least one predefined limit value (GW). The exhaust gas aftertreatment system according to the invention is designed to carry out the aforementioned method. By means of the aforementioned method and the exhaust gas aftertreatment system, a diagnosis of an SCR particle filter (3) can be carried out as an on-board diagnosis, with high reliability and robustness with respect to interfering influences.

IPC 8 full level

F01N 3/20 (2006.01); F01N 3/035 (2006.01); F01N 9/00 (2006.01); F01N 11/00 (2006.01); F01N 13/00 (2010.01); F02D 41/00 (2006.01); F02M 25/00 (2006.01); F02M 26/00 (2016.01)

CPC (source: EP KR US)

F01N 3/035 (2013.01 - EP KR); F01N 3/208 (2013.01 - EP KR US); F01N 9/00 (2013.01 - EP KR US); F01N 11/00 (2013.01 - EP KR US); F01N 13/0097 (2014.06 - EP KR); F02D 41/00 (2013.01 - EP); F02D 41/0055 (2013.01 - KR); F02M 26/00 (2016.02 - EP); F02M 26/15 (2016.02 - EP KR); F01N 3/021 (2013.01 - US); F01N 2250/02 (2013.01 - EP KR); F01N 2430/00 (2013.01 - EP KR); F01N 2550/02 (2013.01 - EP KR); F01N 2550/04 (2013.01 - EP); F01N 2560/021 (2013.01 - EP KR US); F01N 2560/026 (2013.01 - EP KR US); F01N 2560/14 (2013.01 - EP KR US); F01N 2570/14 (2013.01 - EP US); F01N 2610/02 (2013.01 - EP KR US); F01N 2610/146 (2013.01 - EP KR); F01N 2900/0422 (2013.01 - EP KR); F01N 2900/08 (2013.01 - EP KR); F01N 2900/1402 (2013.01 - EP KR); F01N 2900/1406 (2013.01 - EP KR US); F01N 2900/1602 (2013.01 - EP KR US); F01N 2900/1616 (2013.01 - US); F01N 2900/1622 (2013.01 - EP KR); F01N 2900/1812 (2013.01 - EP KR); F02D 41/0055 (2013.01 - EP); F02D 2041/1468 (2013.01 - EP KR US)

Citation (examination)

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DOCDB simple family (publication)

DE 102018215627 A1 20190529; CN 111492126 A 20200804; CN 111492126 B 20220429; EP 3717757 A1 20201007; EP 3717757 B1 20211006; KR 102435576 B1 20220823; KR 20200087859 A 20200721; US 11346267 B2 20220531; US 2020378288 A1 20201203; WO 2019105859 A1 20190606

DOCDB simple family (application)

DE 102018215627 A 20180913; CN 201880077567 A 20181123; EP 18808321 A 20181123; EP 2018082357 W 20181123; KR 20207018496 A 20181123; US 201816767828 A 20181123