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1. WO2018013039 - A SYSTEM AND A METHOD FOR DIAGNOSING THE PERFORMANCE OF TWO NOX SENSORS IN AN EXHAUST GAS PROCESSING CONFIGURATION COMPRISING TWO SCR UNITS

Publication Number WO/2018/013039
Publication Date 18.01.2018
International Application No. PCT/SE2017/050756
International Filing Date 06.07.2017
IPC
F01N 3/20 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
3Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
08for rendering innocuous
10by thermal or catalytic conversion of noxious components of exhaust
18characterised by methods of operation; Control
20specially adapted for catalytic conversion
B01D 53/94 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
53Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols
34Chemical or biological purification of waste gases
92of engine exhaust gases
94by catalytic processes
F01N 11/00 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
11Monitoring or diagnostic devices for exhaust-gas treatment apparatus
CPC
B01D 2251/2067
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
2251Reactants
20Reductants
206Ammonium compounds
2067Urea
B01D 2258/012
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
2258Sources of waste gases
01Engine exhaust gases
012Diesel engines and lean burn gasoline engines
B01D 53/94
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
53Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols,
34Chemical or biological purification of waste gases
92of engine exhaust gases
94by catalytic processes
B01D 53/9418
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
53Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols,
34Chemical or biological purification of waste gases
92of engine exhaust gases
94by catalytic processes
9404Removing only nitrogen compounds
9409Nitrogen oxides
9413Processes characterised by a specific catalyst
9418for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
B01D 53/9495
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
53Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols,
34Chemical or biological purification of waste gases
92of engine exhaust gases
94by catalytic processes
9495Controlling the catalytic process
F01N 11/00
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
11Monitoring or diagnostic devices for exhaust-gas treatment apparatus ; , e.g. for catalytic activity
Applicants
  • SCANIA CV AB [SE]/[SE]
Inventors
  • SOMMANSSON, Joakim
  • STRÅÅT, Fredrik
Agents
  • GARDEMARK, Niklas
Priority Data
1651061-214.07.2016SE
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) A SYSTEM AND A METHOD FOR DIAGNOSING THE PERFORMANCE OF TWO NOX SENSORS IN AN EXHAUST GAS PROCESSING CONFIGURATION COMPRISING TWO SCR UNITS
(FR) SYSTÈME ET PROCÉDÉ DE DIAGNOSTIC DE LA PERFORMANCE DE DEUX CAPTEURS DE NOX DANS UNE CONFIGURATION DE TRAITEMENT DES GAZ D'ÉCHAPPEMENT COMPRENANT DEUX UNITÉS SCR
Abstract
(EN)
The invention relates to a method for diagnosing an exhaust gas processing configuration for a combustion engine (231) of a vehicle (100), said configuration comprising two SCR-units (240, 250), two NOx-sensors (243, 253) and two reducing agent dosing units (237, 247) suitably arranged, comprising the steps of: - performing a series of reducing agent dosing operations by a first reducing agent dosing unit; - comparing measured NOx-contents (NOx1, NOx2) measured by a first NOx-sensor (243) and a second NOx-sensor (253) related to said operations; and - if the respective NOx-content measured by the respective NOx-sensors during the performed reducing agent dosing operations are substantially equal, considering that the respective NOx-sensors provide a proper performance. The invention relates also to a computer program product comprising program code (P) for a computer (200; 210; 500) for implementing a method according to the invention. The invention relates also to a system for diagnosing an exhaust gas processing configuration for a combustion engine (231) of a vehicle (100) and a motor vehicle (100) equipped with the system.
(FR)
L'invention concerne un procédé de diagnostic d'une configuration de traitement de gaz d'échappement d'un moteur à combustion (231) d'un véhicule (100). Cette configuration comprend deux unités SCR (240, 250), deux capteurs NOx (243, 253) et deux unités de dosage d'agent réducteur (237,247) disposées de manière appropriée. Le procédé de diagnostic comprend les étapes consistant à :-effectuer une série d'opérations de dosage d'agent réducteur par une première unité de dosage d'agent réducteur;-comparer les teneurs de NOx- (NOx1, NOx2) mesurées par le premier capteur de NOx (243) et le second capteur de NOx (253) en relation avec les opérations de dosage; et-si les teneurs en NOx mesurées par les capteurs de NOx respectifs pendant les opérations de dosage d'agent réducteur sont sensiblement égaux, alors on considère que les capteurs de NOx respectifs fournissent une performance appropriée. L'invention porte aussi sur un programme informatique qui comprend un code de programme (P) pour un ordinateur (200 ; 210) pour l'exécution du procédé. L'invention concerne également un système pour diagnostiquer une configuration de traitement de gaz d'échappement pour un moteur à combustion (231) d'un véhicule (100) et un véhicule à moteur (100) équipé du système.
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