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1. EP2706207 - NOX PURIFICATION METHOD OF AN EXHAUST PURIFICATION SYSTEM OF AN INTERNAL COMBUSTION ENGINE

Office
European Patent Office
Application Number 11826104
Application Date 14.07.2011
Publication Number 2706207
Publication Date 12.03.2014
Publication Kind B1
IPC
F01N 3/08
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
F01N 3/36
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
24characterised by constructional aspects of converting apparatus
36Arrangements for supply of additional fuel
F02D 41/04
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
DCONTROLLING COMBUSTION ENGINES
41Electrical control of supply of combustible mixture or its constituents
02Circuit arrangements for generating control signals
04Introducing corrections for particular operating conditions
CPC
F01N 3/035
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
02for cooling, or for removing solid constituents of, exhaust
021by means of filters
033in combination with other devices
035with catalytic reactors ; , e.g. catalysed diesel particulate filters
F01N 3/0814
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
0807by using absorbents or adsorbents
0814combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
F01N 3/0842
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
0807by using absorbents or adsorbents
0828characterised by the absorbed or adsorbed substances
0842Nitrogen oxides
F01N 3/0871
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
0807by using absorbents or adsorbents
0871Regulation of absorbents or adsorbents, e.g. purging
F01N 3/106
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
105General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
106Auxiliary oxidation catalysts
F01N 3/2073
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
2066Selective catalytic reduction [SCR]
2073with means for generating a reducing substance from the exhaust gases
Applicants TOYOTA MOTOR CO LTD
Inventors BISAIJI YUKI
YOSHIDA KOHEI
INOUE MIKIO
UMEMOTO KAZUHIRO
Designated States
Title
(DE) NOX REINIGUNGSVERFAHREN EINES ABGASREINIGUNGSSYSTEMS FÜR EINEN VERBRENNUNGSMOTOR
(EN) NOX PURIFICATION METHOD OF AN EXHAUST PURIFICATION SYSTEM OF AN INTERNAL COMBUSTION ENGINE
(FR) PROCÉDÉ DE PURIFICATION DES NOX D'UN SYSTÈME DE PURIFICATION DE GAZ D'ÉCHAPPEMENT POUR MOTEUR À COMBUSTION INTERNE
Abstract
(EN)
In an internal combustion engine, inside of an engine exhaust passage, an upstream side air-fuel ratio sensor (23), a hydrocarbon feed valve (15), an exhaust purification catalyst (13), and a downstream side air-fuel ratio sensor (24) are arranged in this order from the upstream. At the time of engine operation, the injection amount of hydrocarbons from the hydrocarbon feed valve (15) is controlled based on the air-fuel ratio detected by the upstream side air-fuel ratio sensor (23) and the downstream side air-fuel ratio sensor (24) so that the amplitude of change of the concentration of hydrocarbons which flow into the exhaust purification catalyst (13) becomes within a predetermined range of amplitude.

(FR)
Dans le moteur à combustion interne de l'invention, un capteur de rapport air/carburant côté amont (23), une vanne d'alimentation en hydrocarbure (15), un catalyseur de purification de gaz d'échappement (13), et un capteur de rapport air/carburant côté aval (24) sont disposés en ordre depuis l'amont à l'intérieur d'un trajet de gaz d'échappement de moteur. Lors du fonctionnement du moteur, la quantité d'hydrocarbure injectée par la vanne d'alimentation en hydrocarbure (15) est commandée de sorte que l'amplitude de variation de masse volumique d'hydrocarbure introduit dans le catalyseur de purification de gaz d'échappement (13) correspond à une amplitude comprise dans une plage prédéfinie sur la base du rapport air/carburant détecté à l'aide du capteur de rapport air/carburant côté amont (23) et du capteur de rapport air/carburant côté aval (24).