FR2900962A1 - Internal combustion engine`s exhaust line, has plate arranged such that normal to plate is oriented in plane transversal to direction of centered line of pipe, where plate has holes that deviate spray projected on plate, from side of plate - Google Patents

Internal combustion engine`s exhaust line, has plate arranged such that normal to plate is oriented in plane transversal to direction of centered line of pipe, where plate has holes that deviate spray projected on plate, from side of plate Download PDF

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Publication number
FR2900962A1
FR2900962A1 FR0604281A FR0604281A FR2900962A1 FR 2900962 A1 FR2900962 A1 FR 2900962A1 FR 0604281 A FR0604281 A FR 0604281A FR 0604281 A FR0604281 A FR 0604281A FR 2900962 A1 FR2900962 A1 FR 2900962A1
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FR
France
Prior art keywords
plate
exhaust
line
fuel
fuel injector
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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FR0604281A
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French (fr)
Inventor
Jerome Estienne
Samuel Guillat
Jean Paul Hardy
Waldemar Zawisza
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Renault SAS
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Renault SAS
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Application filed by Renault SAS filed Critical Renault SAS
Priority to FR0604281A priority Critical patent/FR2900962A1/en
Publication of FR2900962A1 publication Critical patent/FR2900962A1/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2033—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using a fuel burner or introducing fuel into exhaust duct
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/21—Mixing gases with liquids by introducing liquids into gaseous media
    • B01F23/213—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids
    • B01F23/2132—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids using nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
    • B01F25/25—Mixing by jets impinging against collision plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/36—Arrangements for supply of additional fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • F01N2610/102—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance after addition to exhaust gases, e.g. by a passively or actively heated surface in the exhaust conduit
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

The line has a high pressure fuel injector (5) arranged in an exhaust pipe (61) in which a plane, curve or corrugated plate (10) is associated, where a hot exhaust gas (66) is circulated in the pipe. A fuel spray (52) from the fuel injector is projected on the plate. The plate is arranged such that the normal (N) to the plate is oriented in a plane transversal to the direction of a centered line of the pipe, where the plate is provided with a set of holes that deviate a fuel spray (54) projected on the plate, from a side of the plate.

Description

DOMAINE TECHNIQUE AUQUEL SE RAPPORTE L'INVENTION La présente inventionTECHNICAL FIELD TO WHICH THE INVENTION RELATES The present invention

concerne de manière générale les moteurs à combustion. L'invention concerne plus particulièrement une ligne d'échappement d'un moteur à combustion interne comportant une conduite d'échappement, dans laquelle circule des gaz d'échappement, et un injecteur de carburant disposé dans ladite conduite d'échappement auquel est associée une plaque sur laquelle est destiné à être projeté un jet de carburant provenant dudit injecteur de carburant. ARRIERE-PLAN TECHNOLOGIQUE Les ligne d'échappement de moteur à combustion interne sont pourvues généralement de moyens de dépollution et de filtrage des gaz d'échappement traversés par la conduite d'échappement. Ces moyens de dépollution et de filtrage des lignes d'échappement comportent usuellement un pot catalytique et un filtre à particules. Le filtre à particules permet de récupérer les particules polluantes émises par la combustion du mélange de gaz frais dans la chambre de combustion du moteur. À partir d'un certain taux de remplissage du filtre à particules, son efficacité diminue fortement. Il convient alors d'éliminer les particules qui remplissent le filtre à particules. Pour cela on réalise une phase de régénération qui consiste injecter du carburant dans la ligne d'échappement, ce qui entraîne une phase d'oxydation exothermique dans le pot catalytique. Les gaz d'échappement sortent alors du pot catalytique avec une température élevée et entrent dans le filtre à particules en brûlant les particules polluantes qui remplissent le filtre à particules.  generally relates to combustion engines. The invention more particularly relates to an exhaust line of an internal combustion engine comprising an exhaust pipe, in which exhaust gas flows, and a fuel injector disposed in said exhaust pipe which is associated with a plate on which is projected a jet of fuel from said fuel injector. BACKGROUND OF THE INVENTION The exhaust lines of an internal combustion engine are generally provided with means of depollution and filtering of the exhaust gas through which the exhaust pipe. These means of depolluting and filtering the exhaust lines usually comprise a catalytic converter and a particulate filter. The particulate filter is used to recover the polluting particles emitted by the combustion of the fresh gas mixture in the combustion chamber of the engine. From a certain degree of filling of the particulate filter, its efficiency decreases sharply. It is then necessary to remove the particles that fill the particulate filter. For this, a regeneration phase is performed which consists of injecting fuel into the exhaust line, which results in an exothermic oxidation phase in the catalytic converter. The exhaust gases then exit the catalytic converter with a high temperature and enter the particulate filter by burning the polluting particles that fill the particulate filter.

Il est connu pour augmenter les performances de cette phase de régénération de disposer un injecteur de carburant supplémentaire directement dans la ligne d'échappement. La difficulté consiste alors à maîtriser la vaporisation du carburant et son homogénéisation dans les gaz d'échappement pour optimiser la combustion des particules remplissant le filtre à particules et ne pas rejeter d'hydrocarbures dans l'atmosphère. Le document EP 1314864 propose un injecteur de carburant positionné dans une conduite d'échappement, dans lequel le nez de l'injecteur de carburant est entouré de plaques qui sont destinées à protéger le nez de l'injecteur de carburant du flux des gaz d'échappement. La projection de carburant sur ces plaques peut permettre d'améliorer la vaporisation du carburant injecté, mais ces plaques s'étendent transversalement au sens de circulation des gaz d'échappement pour justement protéger le nez du flux de gaz d'échappement et donc provoquent des pertes de charge dans le circuit d'échappement, ce qui diminue les performances du moteur. Le document US 6539708 propose également un injecteur de carburant positionné dans une conduite d'échappement. Selon ce document, il est prévu une plaque utilisée pour disperser le carburant projeté sur ladite plaque, mais l'inclinaison de la plaque est réglée par rotation autour d'un axe de direction transversale à la direction du flux de gaz d'échappement, ce qui fait que la plaque entrave une partie de la section de passage de la conduite d'échappement, la surface de cette partie de section étant fonction de l'inclinaison de la plaque. Le flux de gaz échappement est alors diminué ce qui provoque des pertes de charge dans la conduite d'échappement et donc une diminution des performances du moteur. OBJET DE L'INVENTION L'invention propose une nouvelle ligne d'échappement dans laquelle le carburant injecté est correctement vaporisé et diffusé dans les gaz d'échappement, tout en limitant les pertes de charge dans la conduite d'échappement. À cet effet, on propose selon l'invention une ligne d'échappement d'un moteur à combustion interne comportant une conduite d'échappement, dans laquelle circule des gaz d'échappement, et un injecteur de carburant disposé dans ladite conduite d'échappement auquel est associée une plaque sur laquelle est destiné à être projeté un jet de carburant provenant dudit injecteur de carburant, dans laquelle la normale à ladite plaque est orientée dans un plan transversal à la direction de la ligne moyenne de la conduite d'échappement. L'impact du jet de carburant sur la plaque permet de fragmenter les gouttelettes de carburant, ce qui augmente la surface d'échange du carburant avec les gaz d'échappement chauds et donc favorise la vaporisation du carburant dans la conduite d'échappement. En outre, l'impact du jet de carburant sur la plaque permet de dévier les gouttelettes de carburant et donc de les disperser dans les gaz d'échappement. La vaporisation et la dispersion du carburant injecté favorisent ainsi la diffusion de ce carburant injecté dans les gaz d'échappement.  It is known to increase the performance of this regeneration phase to have an additional fuel injector directly in the exhaust line. The difficulty then consists in controlling the vaporization of the fuel and its homogenization in the exhaust gases in order to optimize the combustion of the particles filling the particulate filter and not to release hydrocarbons into the atmosphere. EP 1314864 proposes a fuel injector positioned in an exhaust pipe, in which the nose of the fuel injector is surrounded by plates which are intended to protect the nose of the fuel injector from the flow of gas. exhaust. The projection of fuel on these plates can improve the vaporization of the injected fuel, but these plates extend transversely to the flow direction of the exhaust gas to precisely protect the nose of the exhaust stream and therefore cause problems. pressure drops in the exhaust system, which decreases engine performance. US 6539708 also proposes a fuel injector positioned in an exhaust pipe. According to this document, there is provided a plate used to disperse the fuel projected on said plate, but the inclination of the plate is adjusted by rotation about a direction axis transverse to the direction of the flow of exhaust gas, this whereby the plate obstructs a portion of the passage section of the exhaust line, the area of this section portion being a function of the inclination of the plate. The flow of exhaust gas is then decreased, which causes pressure losses in the exhaust pipe and therefore a decrease in engine performance. OBJECT OF THE INVENTION The invention proposes a new exhaust line in which the fuel injected is properly vaporized and diffused in the exhaust gas, while limiting the pressure losses in the exhaust pipe. For this purpose, it is proposed according to the invention an exhaust line of an internal combustion engine having an exhaust pipe, in which exhaust gas flows, and a fuel injector disposed in said exhaust pipe. associated with a plate on which is projected a jet of fuel from said fuel injector, wherein the normal to said plate is oriented in a plane transverse to the direction of the average line of the exhaust pipe. The impact of the fuel jet on the plate makes it possible to break up the fuel droplets, which increases the fuel exchange surface with the hot exhaust gases and thus promotes the vaporization of the fuel in the exhaust pipe. In addition, the impact of the fuel jet on the plate makes it possible to deflect the fuel droplets and thus to disperse them in the exhaust gases. Vaporization and dispersion of the injected fuel thus promote the diffusion of this fuel injected into the exhaust gas.

Au surplus, seule la tranche de la plaque fait face aux flux d'écoulement de gaz d'échappement ce qui permet de limiter les pertes de charge du flux d'écoulement des gaz d'échappement dans la conduite d'échappement. Enfin, l'orientation de la plaque permet d'exposer les deux faces de la plaque aux flux d'écoulement des gaz d'échappement, les deux faces étant alors soumises à la température des gaz d'échappement, ce qui favorise la vaporisation du jet de carburant projeté sur la plaque. Selon une première caractéristique avantageuse de l'invention, la plaque comporte au moins un trou.  In addition, only the slice of the plate faces the flow of exhaust gas flow which limits the pressure losses of the flow of exhaust gas flow in the exhaust pipe. Finally, the orientation of the plate makes it possible to expose the two faces of the plate to the flow streams of the exhaust gases, the two faces then being subjected to the temperature of the exhaust gases, which favors the vaporization of the exhaust gas. jet of fuel projected on the plate. According to a first advantageous characteristic of the invention, the plate comprises at least one hole.

La présence d'au moins un trou dans la plaque permet de dévier une partie du jet de carburant projeté sur ce trou, de l'autre côté de la plaque, ce qui augmente la dispersion du carburant dans les gaz d'échappement et favorise donc la diffusion du carburant dans les gaz échappement. D'autres caractéristiques avantageuses et non limitatives de la ligne d'échappement selon l'invention sont les suivantes : - la plaque comporte une pluralité de trous ; - il est prévu des moyens de fixation de la plaque sur l'injecteur de carburant ; la plaque est plane ou ondulée; - la plaque et l'injecteur de carburant sont décentrés par rapport à la ligne moyenne de la conduite d'échappement ; la plaque est agencée avec l'injecteur de carburant de telle sorte que l'injecteur de carburant soit hors de portée d'une réflexion du jet de carburant sur la plaque ; la position de la plaque est réglable angulairement par rotation autour d'un axe parallèle à la ligne moyenne de la conduite d'échappement. - la ligne d'échappement comporte des moyens de dépollution et de filtrage des gaz d'échappement traversés par la conduite d'échappement et disposés en aval, dans le sens d'écoulement des gaz d'échappement, de l'injecteur de carburant.  The presence of at least one hole in the plate makes it possible to deflect a portion of the jet of fuel projected on this hole, on the other side of the plate, which increases the dispersion of the fuel in the exhaust gases and thus promotes the diffusion of the fuel in the exhaust gases. Other advantageous and non-limiting features of the exhaust line according to the invention are the following: the plate comprises a plurality of holes; - There is provided means for fixing the plate on the fuel injector; the plate is flat or wavy; the plate and the fuel injector are off-center with respect to the mean line of the exhaust pipe; the plate is arranged with the fuel injector such that the fuel injector is out of range of a reflection of the fuel jet on the plate; the position of the plate is angularly adjustable by rotation about an axis parallel to the average line of the exhaust pipe. - The exhaust line comprises means for cleaning and filtering the exhaust gas through which the exhaust pipe and disposed downstream in the direction of flow of the exhaust gas, the fuel injector.

DESCRIPTION DETAILLEE D'UN EXEMPLE DE REALISATION La description qui va suivre en regard des dessins annexés d'un mode de réalisation, donné à titre d'exemple non limitatif, fera bien comprendre en quoi consiste l'invention et comment elle peut être réalisée. Sur les dessins annexés : - la figure 1 est une vue en coupe axiale d'une partie d'une conduite d'échappement équipée d'un injecteur et d'une plaque selon l'invention ; -la figure 2 est une vue en coupe transversale de la partie de la conduite d'échappement de la figure 1 ; - la figure 3 est une vue en perspective de l'injecteur de carburant et de la plaque de la figure 1 ; et - la figure 4 est une vue en perspective de l'impact d'un jet de carburant projeté sur la plaque selon l'invention. Sur la figure 1, on a représenté une partie d'une ligne d'échappement 6 d'un moteur à combustion interne. Cette ligne d'échappement 6 comporte une conduite d'échappement 61 dans laquelle circule des gaz d'échappement 66 et des moyens de dépollution et de filtrage (non représentés) des gaz d'échappement traversés par ladite conduite d'échappement 61. Les moyens de dépollution et de filtrage (non représentés) sont ici constitués d'un pot catalytique et d'un filtre à particules. Cette ligne d'échappement 6 comporte également, d'une part, un injecteur de carburant 5 dont le nez 51 débouche dans la conduite d'échappement 61, en amont du pot catalytique de manière à pouvoir injecter du carburant dans la ligne d'échappement 6 pour régénérer le filtre à particules et, d'autre part, une plaque 10 sur laquelle est destiné à être projeté un jet de carburant 52 provenant dudit injecteur de carburant 5. Avantageusement, selon l'invention, la plaque est agencée de telle sorte que la normale N à ladite plaque 10 soit orientée dans le plan transversal à la direction de la ligne moyenne de la conduite d'échappement 61. Ici, au lieu de positionnement de la plaque 10, la direction de la ligne moyenne de la conduite d'échappement 61 est sensiblement la direction d'écoulement des gaz d'échappement 66 (voir figure 2). Ainsi, sur le dessin de la figure 2, au lieu de positionnement de la plaque 10 auquel est attaché le repère XYZ, l'axe Z étant parallèle à la direction d'écoulement des gaz d'échappement 66 (ou encore la direction de la ligne moyenne de la conduite d'échappement), la normale N à ladite plaque 10 s'étend dans le plan XY qui est transversal à la direction de l'axe Z. Cette plaque 10 est destinée comme expliqué ciaprès à favoriser la vaporisation du carburant injecté et à homogénéiser le jet de carburant 52 dans les gaz d'échappement 66 tout en limitant les pertes de charge dans la conduite d'échappement 61. Comme représenté sur les figures 2 et 3, la plaque 10 est plane. En variante, la plaque 10 peut présenter une forme sensiblement courbe, à condition que la normale N en tout point de la plaque 10 soit toujours orientée dans le plan transversal à la ligne moyenne de la conduite d'échappement 61. La plaque 10 comporte une pluralité de trous 11. Un tel diamètre des trous 11 de la plaque 10 permet d'optimiser la quantité de carburant réfléchie sur la plaque 10, la quantité de carburant transmise de l'autre côté de la plaque 10, ainsi que la fragmentation des gouttelettes de carburant. La faible épaisseur de la plaque 10 limite la surface de la tranche qui fait face aux flux de gaz d'échappement 66 et donc limite la perte de charge du flux de gaz d'échappement dans la conduite d'échappement 61. Il est prévu des moyens de fixation 21, 22, par exemple des pattes de fixation, de la plaque 10 sur l'injecteur de carburant 5. En variante, on peut prévoir que les moyens de fixation soient reliés à la paroi de la conduite d'échappement 61. Comme représenté sur la figure 2, la plaque 10 et l'injecteur de carburant 5 sont décentrés par rapport à la ligne moyenne de la conduite d'échappement.  DETAILED DESCRIPTION OF AN EXEMPLARY EMBODIMENT The following description with reference to the accompanying drawings of an embodiment, given by way of non-limiting example, will make it clear what the invention consists of and how it can be implemented. In the accompanying drawings: - Figure 1 is an axial sectional view of a portion of an exhaust pipe equipped with an injector and a plate according to the invention; FIG. 2 is a cross-sectional view of the part of the exhaust pipe of FIG. 1; FIG. 3 is a perspective view of the fuel injector and the plate of FIG. 1; and FIG. 4 is a perspective view of the impact of a jet of fuel projected onto the plate according to the invention. In Figure 1, there is shown a portion of an exhaust line 6 of an internal combustion engine. This exhaust line 6 comprises an exhaust duct 61 in which exhaust gas 66 circulates and means of depollution and filtering (not shown) of the exhaust gas through which said exhaust pipe 61. The means depollution and filtering (not shown) are constituted by a catalytic converter and a particulate filter. This exhaust line 6 also comprises, on the one hand, a fuel injector 5 whose nose 51 opens into the exhaust pipe 61, upstream of the catalytic converter so as to inject fuel into the exhaust line 6 to regenerate the particulate filter and, secondly, a plate 10 on which is intended to be projected a jet of fuel 52 from said fuel injector 5. Advantageously, according to the invention, the plate is arranged in such a way that the normal N to said plate 10 is oriented in the plane transverse to the direction of the mean line of the exhaust pipe 61. Here, instead of positioning the plate 10, the direction of the average line of the pipe d Exhaust 61 is substantially the flow direction of the exhaust gas 66 (see FIG. 2). Thus, in the drawing of Figure 2, instead of positioning the plate 10 which is attached the XYZ mark, the Z axis being parallel to the flow direction of the exhaust gas 66 (or the direction of the average line of the exhaust pipe), the normal N to said plate 10 extends in the XY plane which is transverse to the direction of the Z axis. This plate 10 is intended as explained below to promote the vaporization of fuel injected and to homogenize the jet of fuel 52 in the exhaust gas 66 while limiting the pressure losses in the exhaust pipe 61. As shown in Figures 2 and 3, the plate 10 is flat. Alternatively, the plate 10 may have a substantially curved shape, provided that the normal N at any point of the plate 10 is always oriented in the plane transverse to the mean line of the exhaust pipe 61. The plate 10 comprises a plurality of holes 11. Such a diameter of the holes 11 of the plate 10 optimizes the amount of fuel reflected on the plate 10, the amount of fuel transmitted on the other side of the plate 10, as well as the fragmentation of the droplets fuel. The small thickness of the plate 10 limits the area of the wafer that faces the exhaust gas flows 66 and therefore limits the pressure drop of the exhaust gas stream in the exhaust pipe 61. fixing means 21, 22, for example fixing lugs, of the plate 10 on the fuel injector 5. Alternatively, it can be provided that the fastening means are connected to the wall of the exhaust pipe 61. As shown in FIG. 2, the plate 10 and the fuel injector 5 are off-center with respect to the mean line of the exhaust pipe.

Ainsi, la direction d'injection de carburant est décentrée par rapport à la ligne moyenne de la conduite d'échappement, ce qui permet d'augmenter l'angle de réflexion du jet de carburant 52 sur la plaque 10 et donc d'augmenter la dispersion du carburant dans les gaz d'échappement. La plaque 10 est inclinée d'un angle A par rapport à la direction d'injection de carburant, l'angle étant choisi de manière à optimiser la dispersion du jet de carburant 52 projeté sur la plaque 10. En outre, l'injecteur de carburant 5, est situé à une distance choisie du point d'impact du jet de carburant 52 sur la plaque 10 de telle sorte que l'injecteur de carburant 5 soit hors de portée d'une réflexion du jet de carburant 52 sur la plaque 10.  Thus, the fuel injection direction is off-center with respect to the mean line of the exhaust pipe, which makes it possible to increase the angle of reflection of the fuel jet 52 on the plate 10 and thus to increase the dispersion of the fuel in the exhaust gas. The plate 10 is inclined at an angle A with respect to the direction of fuel injection, the angle being chosen so as to optimize the dispersion of the jet of fuel 52 projected on the plate 10. In addition, the injector fuel 5, is located at a selected distance from the point of impact of the fuel jet 52 on the plate 10 so that the fuel injector 5 is out of range of a reflection of the fuel jet 52 on the plate 10 .

Lors d'un phase de régénération du filtre à particules, l'injecteur de carburant 5 et la plaque 10 sont utilisés de la manière suivante. Les gaz échappement 66 circulent dans la conduite échappement 61 et longent la plaque 10. Or, seule la tranche de la plaque 10 fait face aux flux d'écoulement de gaz d'échappement, ce qui permet de limiter les pertes de charge du flux d'écoulement des gaz d'échappement dans la conduite d'échappement 61. Un jet de carburant 52 est projeté sur la plaque 10 ce qui entraîne la fragmentation des gouttelettes de carburant et facilite la vaporisation du jet de carburant 52 au contact des gaz d'échappement 66 chauds. Au surplus, grâce à l'orientation de la normale à la plaque 10 dans le plan transversal à la direction de l'écoulement des gaz d'échappement, le flux de gaz d'échappement longe et chauffe la plaque 10 de part et d'autres de ces deux faces ce qui favorise la vaporisation du jet de carburant 52, 53, 54 projeté sur la plaque 10.  During a regeneration phase of the particulate filter, the fuel injector 5 and the plate 10 are used in the following manner. The exhaust gases 66 circulate in the exhaust duct 61 and run along the plate 10. However, only the edge of the plate 10 faces the flow of exhaust gas flow, which makes it possible to limit the pressure losses of the exhaust gas stream. Exhaust gas flow in the exhaust pipe 61. A jet of fuel 52 is projected onto the plate 10 which causes the fragmentation of the fuel droplets and facilitates the vaporization of the fuel jet 52 in contact with the gas. 66 hot exhaust. Moreover, thanks to the orientation of the normal to the plate 10 in the plane transverse to the direction of the flow of the exhaust gas, the flow of exhaust gas runs along and heats the plate 10 on both sides. other of these two faces which promotes the vaporization of the jet of fuel 52, 53, 54 projected on the plate 10.

L'impact du jet de carburant 52 sur la plaque 10 permet également de dévier par réflexion une partie 53 du jet de carburant 52, ce qui participe à la dispersion du jet de carburant dans les gaz d'échappement 66 (voir figure 4). Enfin, toujours sur la figure 4, les trous 11 de la plaque 10 permettent de dévier, de l'autre côté de la plaque 10, une autre partie 54 du jet de carburant 52 projeté sur la plaque 10, ce qui augmente la dispersion du carburant dans les gaz d'échappement 66. La présente invention n'est nullement limitée au mode de réalisation décrit et représenté, mais l'homme du métier saura y apporter toute variante conforme à son esprit.  The impact of the fuel jet 52 on the plate 10 also makes it possible to deflect a portion 53 of the fuel jet 52 by reflection, which contributes to the dispersion of the fuel jet in the exhaust gas 66 (see FIG. 4). Finally, again in FIG. 4, the holes 11 of the plate 10 make it possible to deflect, on the other side of the plate 10, another portion 54 of the fuel jet 52 projected onto the plate 10, which increases the dispersion of the The present invention is in no way limited to the embodiment described and shown, but the skilled person will be able to make any variant within his mind.

On peut prévoir que la position de la plaque est réglable angulairement par rotation autour d'un axe parallèle à la ligne moyenne de la conduite d'échappement. Quelle que soit l'inclinaison de la plaque, celle-ci expose toujours uniquement sa tranche aux flux de gaz d'échappement. Ainsi, la perte de charge du flux de gaz d'échappement dans les conduits d'échappement est très limitée et est indépendante de l'inclinaison de la plaque. De préférence, on utilise ici un injecteur de carburant à haute pression, mais bien entendu, l'invention s'applique à tout type d'injecteur de carburant.  It can be provided that the position of the plate is angularly adjustable by rotation about an axis parallel to the mean line of the exhaust pipe. Whatever the inclination of the plate, it still only exposes its slice to the exhaust gas flow. Thus, the pressure drop of the exhaust stream in the exhaust ducts is very limited and is independent of the inclination of the plate. Preferably, a high-pressure fuel injector is used here, but of course the invention applies to any type of fuel injector.

Claims (9)

REVENDICATIONS 1. Ligne d'échappement (6) d'un moteur à combustion interne comportant une conduite d'échappement (61), dans laquelle circule des gaz d'échappement (66), et un injecteur de carburant (5) disposé dans ladite conduite d'échappement (61) auquel est associée une plaque (10) sur laquelle est destiné à être projeté un jet de carburant (52) provenant dudit injecteur de carburant (5), caractérisée en ce que la normale (N) à ladite plaque (10) est orientée dans un plan transversal à la direction de la ligne moyenne de la conduite d'échappement (61).  An exhaust line (6) of an internal combustion engine having an exhaust duct (61), in which exhaust gas (66) flows, and a fuel injector (5) disposed in said duct exhaust pipe (61) to which is associated a plate (10) on which is projected a jet of fuel (52) coming from said fuel injector (5), characterized in that the normal (N) to said plate ( 10) is oriented in a plane transverse to the direction of the mean line of the exhaust pipe (61). 2. Ligne d'échappement (6) selon la revendication précédente, caractérisée en ce que la plaque (10) comporte au moins un trou (11).  2. Exhaust line (6) according to the preceding claim, characterized in that the plate (10) has at least one hole (11). 3. Ligne d'échappement (6) selon la revendication précédente, caractérisée en ce que la plaque (10) comporte une pluralité de trous (11)  3. Exhaust line (6) according to the preceding claim, characterized in that the plate (10) has a plurality of holes (11). 4. Ligne d'échappement (6) selon l'une des revendications précédentes, caractérisée en ce qu'il est prévu des moyens de fixation (21,22) de la plaque (10) sur l'injecteur de carburant (5).  4. Exhaust line (6) according to one of the preceding claims, characterized in that there is provided fastening means (21,22) of the plate (10) on the fuel injector (5). 5. Ligne d'échappement (6) selon l'une des revendications précédentes, caractérisée en ce que la plaque (10) est plane ou ondulée.  5. Exhaust line (6) according to one of the preceding claims, characterized in that the plate (10) is flat or corrugated. 6. Ligne d'échappement (6) selon l'une des revendications précédentes, caractérisée en ce que la position de la plaque (10) est réglable angulairement par rotation autour d'un axe parallèle à la ligne moyenne de la conduite d'échappement.  6. Exhaust line (6) according to one of the preceding claims, characterized in that the position of the plate (10) is angularly adjustable by rotation about an axis parallel to the average line of the exhaust pipe . 7. Ligne d'échappement (6) selon l'une des revendications précédentes, caractérisée en ce que la plaque (10) et l'injecteur de carburant (5) sont décentrés par rapport à la ligne moyenne de la conduite d'échappement (61).  7. Exhaust line (6) according to one of the preceding claims, characterized in that the plate (10) and the fuel injector (5) are off-center with respect to the mean line of the exhaust pipe ( 61). 8. Ligne d'échappement (6) selon l'une des revendications précédentes, caractérisée en ce que la plaque (10) est agencée avec l'injecteur de carburant (5) de telle sorte que l'injecteur de carburant (5) soit hors de portée d'une réflexion du jet de carburant (52, 53, 54) sur la plaque (10).  8. Exhaust line (6) according to one of the preceding claims, characterized in that the plate (10) is arranged with the fuel injector (5) so that the fuel injector (5) is out of range of reflection of the fuel jet (52, 53, 54) on the plate (10). 9. Ligne d'échappement (6) selon l'une des revendications précédentes, caractérisée en ce qu'elle comporte des moyens de dépollution et de filtrage des gaz d'échappement (66) traversés par la conduite d'échappement (61) et disposés en aval, dans le sens d'écoulement des gaz d'échappement (66), de l'injecteur de carburant (5).  9. Exhaust line (6) according to one of the preceding claims, characterized in that it comprises means for cleaning and filtering the exhaust gas (66) through which the exhaust pipe (61) and arranged downstream, in the direction of flow of the exhaust gas (66), of the fuel injector (5).
FR0604281A 2006-05-15 2006-05-15 Internal combustion engine`s exhaust line, has plate arranged such that normal to plate is oriented in plane transversal to direction of centered line of pipe, where plate has holes that deviate spray projected on plate, from side of plate Pending FR2900962A1 (en)

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FR0604281A FR2900962A1 (en) 2006-05-15 2006-05-15 Internal combustion engine`s exhaust line, has plate arranged such that normal to plate is oriented in plane transversal to direction of centered line of pipe, where plate has holes that deviate spray projected on plate, from side of plate

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FR0604281A FR2900962A1 (en) 2006-05-15 2006-05-15 Internal combustion engine`s exhaust line, has plate arranged such that normal to plate is oriented in plane transversal to direction of centered line of pipe, where plate has holes that deviate spray projected on plate, from side of plate

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2935756A1 (en) * 2008-09-08 2010-03-12 Renault Sas Fuel vapor injection nozzle for fuel vaporizer in internal combustion engine, has deflector provided with shutters that define together projecting angular sector, where top of sector is directed opposite to fuel vapor injection direction
JP2011052667A (en) * 2009-09-04 2011-03-17 Mitsubishi Fuso Truck & Bus Corp Device for controlling exhaust emission
WO2013004769A1 (en) * 2011-07-05 2013-01-10 Faurecia Systemes D'echappement Exhaust gas purification assembly
US9267417B2 (en) 2013-10-31 2016-02-23 Faurecia Emissions Control Technologies Usa, Llc Diffuser plate

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EP1054139A1 (en) * 1999-05-19 2000-11-22 DaimlerChrysler AG Exhaust gas purification arrangement with NOx reduction and addition of reduction agent
US6539708B1 (en) 1998-02-16 2003-04-01 Siemens Aktiengesellscahft Metering system
EP1314864A1 (en) 2001-11-27 2003-05-28 Toyota Jidosha Kabushiki Kaisha Injector for engine exhaust gas purifying apparatus
US20060016176A1 (en) * 2004-07-23 2006-01-26 Hilden David L Diesel exhaust aftertreatment device regeneration system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6539708B1 (en) 1998-02-16 2003-04-01 Siemens Aktiengesellscahft Metering system
EP1054139A1 (en) * 1999-05-19 2000-11-22 DaimlerChrysler AG Exhaust gas purification arrangement with NOx reduction and addition of reduction agent
EP1314864A1 (en) 2001-11-27 2003-05-28 Toyota Jidosha Kabushiki Kaisha Injector for engine exhaust gas purifying apparatus
US20060016176A1 (en) * 2004-07-23 2006-01-26 Hilden David L Diesel exhaust aftertreatment device regeneration system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2935756A1 (en) * 2008-09-08 2010-03-12 Renault Sas Fuel vapor injection nozzle for fuel vaporizer in internal combustion engine, has deflector provided with shutters that define together projecting angular sector, where top of sector is directed opposite to fuel vapor injection direction
JP2011052667A (en) * 2009-09-04 2011-03-17 Mitsubishi Fuso Truck & Bus Corp Device for controlling exhaust emission
WO2013004769A1 (en) * 2011-07-05 2013-01-10 Faurecia Systemes D'echappement Exhaust gas purification assembly
FR2977633A1 (en) * 2011-07-05 2013-01-11 Faurecia Sys Echappement EXHAUST GAS PURIFICATION ASSEMBLY
CN103649483A (en) * 2011-07-05 2014-03-19 佛吉亚排气系统有限公司 Exhaust gas purification assembly
US9464546B2 (en) 2011-07-05 2016-10-11 Faurecia Systemes D'echappement Assembly for purifying exhaust gases
CN103649483B (en) * 2011-07-05 2016-12-14 佛吉亚排气系统有限公司 For purifying the assembly of aerofluxus
US9267417B2 (en) 2013-10-31 2016-02-23 Faurecia Emissions Control Technologies Usa, Llc Diffuser plate

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