EP2064421A1 - Arrangement for the pollution control of an internal combustion engine comprising a conduit provided with a projecting element - Google Patents

Arrangement for the pollution control of an internal combustion engine comprising a conduit provided with a projecting element

Info

Publication number
EP2064421A1
EP2064421A1 EP07823670A EP07823670A EP2064421A1 EP 2064421 A1 EP2064421 A1 EP 2064421A1 EP 07823670 A EP07823670 A EP 07823670A EP 07823670 A EP07823670 A EP 07823670A EP 2064421 A1 EP2064421 A1 EP 2064421A1
Authority
EP
European Patent Office
Prior art keywords
duct
determined
arrangement according
fuel
conduit
Prior art date
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.)
Withdrawn
Application number
EP07823670A
Other languages
German (de)
French (fr)
Inventor
Claude Dupouy
Emmanuel Burgat
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Original Assignee
Renault SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP2064421A1 publication Critical patent/EP2064421A1/en
Withdrawn legal-status Critical Current

Links

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
    • F01N3/02—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
    • 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
    • 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
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • 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
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/4317—Profiled elements, e.g. profiled blades, bars, pillars, columns or chevrons
    • 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
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/43197—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor characterised by the mounting of the baffles or obstructions
    • B01F25/431971—Mounted on the wall
    • 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
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • 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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1861—Construction facilitating manufacture, assembly, or disassembly the assembly using parts formed by casting or moulding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
    • F02B67/10—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of charging or scavenging apparatus
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/28—Tubes being formed by moulding or casting x
    • 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
    • F01N2510/00—Surface coverings
    • 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

Definitions

  • the invention relates to an arrangement for the depollution of a motor vehicle engine.
  • the invention relates more particularly to an arrangement for the depollution of a motor vehicle engine, of the type which comprises at least one exhaust line, arranged downstream of a heat engine of the vehicle, which comprises at least one catalyst and a particle filtering element contained in the exhaust gas of said engine, of the type which comprises at least one fuel injection device, arranged in a determined duct of the exhaust line upstream of the filter element of the particles, comprising an injector which is intended to produce a mixture of fuel and exhaust gas in the duct intended to be ignited in the particle filtering element in order to cause in said filtering element a rise in temperature which makes it possible to suppress the particles contained in said filter element.
  • the fuel injected by the fuel injection device is injected into a determined conduit whose inner walls are generally smooth. This results in poor vaporization of the fuel, which tends to accumulate in liquid form on the internal walls of the duct without evaporating completely. Therefore, it is necessary to inject large amounts of fuel to achieve a mixture containing sufficient fuel to be able to raise sufficiently the temperature within the particulate filter element.
  • This design is particularly penalizing, both in terms of fuel consumption and pollution from the environment, the non-vaporized liquid fuel is then rejected by the vehicle exhaust without being ignited.
  • the invention overcomes this disadvantage by proposing an arrangement comprising means for improving the vaporization of the injected fuel.
  • the invention proposes an arrangement of the type described above, characterized in that the conduit has on its inner wall a protruding element arranged substantially facing the injector, which is intended to promote the vaporization of the fuel in the mixture by increasing the exchange surface between the exhaust gas and fuel on the inner wall of the duct and creating turbulence in the flow of the mixture.
  • the projecting element is arranged in a zone of the internal wall of the duct delimited by a spray cone of the injector
  • the projecting element consists of at least one rib
  • the projecting element comprises a plurality of ribs; the ribs are arranged according to a propeller profile whose diameter corresponds to the internal diameter of the duct;
  • the duct is made by a foundry process and the protruding element is molded with the duct, - the duct is made of cast iron.
  • the duct is an angled outlet duct of a radiocompressor equipping the vehicle.
  • FIG. 1 is a diagrammatic view of an arrangement according to the invention
  • - Figure 2 is a perspective view of an arrangement according to the invention adapted to a curved outlet duct of a turbocharger.
  • FIG. 1 a portion of an arrangement 10 for the pollution of a motor vehicle engine.
  • the arrangement 10 comprises at least one exhaust line, arranged downstream of a vehicle engine (not shown), which comprises at least one catalyst and a filter element of the particles contained in the exhaust gases. exhaust of said engine (not shown).
  • the arrangement 10 which comprises at least one fuel injection device 12, in particular an injector 12, a nose 14 of which opens into a duct 16 determined from the exhaust line upstream of the particle filtering element.
  • the duct 16 comprises an upstream end 18 which is connected for example to an exhaust manifold of the engine, and a downstream end 20 which is connected to a particle filter element inlet (not shown).
  • the injector 12 is intended to produce in the conduit 16 determined a mixture of fuel and exhaust gas which is intended to be ignited in the particle filtering element to cause in said filter element a temperature rise allowing remove the particles contained in said filter element.
  • the conduit 16 determined has on its inner wall 22 a projecting element 24, arranged substantially facing the injector 12, which is intended to promote the vaporization of the fuel in the mixture. increasing the exchange surface between the liquid fuel and the exhaust gas on the inner wall 22 of the duct.
  • the protruding element 24 also makes it possible to create turbulence in the flow of the mixture, which promotes mixing of the liquid fuel in the exhaust gas, and consequently promotes the vaporization of the fuel in the exhaust gas. .
  • the projecting element 24 is arranged in an area 26 of the inner wall of the duct which is delimited by a cone 28 of " ⁇ " angle of spray of the injector 12.
  • This configuration makes it possible to limit the zone 26 to the strict zone necessary for the mixing of the fuel coming from the injector 12 and the exhaust gases, without unduly disturbing the gas flow at any other point in the determined duct. .
  • the projecting element 24 consists of at least one rib 26.
  • Each rib 26 makes it possible to increase the exchange surfaces between the internal wall 22 of the pipe 16 determined and the liquid fuel, which is then vaporized because of the high temperature to which the pipe 16 is subjected.
  • the efficiency of the arrangement 10 will be increased as the element 24 projecting comprises a plurality of ribs 26.
  • the ribs 26 are arranged in a helix profile whose diameter corresponds to to the internal diameter of the duct 16. This configuration is designed to promote a vaporization as complete as possible of the liquid fuel droplets that are received on the ribs 26 of the duct 1 6.
  • the ribs 26 in a helix make it possible to encourage a drive of the liquid fuel by the exhaust gases along the spiral profile of the grooves, preventing it from stagnating, which inevitably leads to its vaporization as it progresses. extends along the helix profile of the ribs 26.
  • the protruding element 24 is integral with the conduit 1 6. This configuration ensures optimum heat transfer from the conduit 1 6 to the ribs 26.
  • the conduit 1 6 is made by a casting process and the element 24 projecting is molded with the conduit 16. This configuration provides a conduit 1 6 of a reduced manufacturing cost.
  • the duct 16 is made of cast iron, which has a high heat capacity, this allowing the conduit 1 6 to maintain a high temperature long after stopping the engine of the vehicle, to allow a new vaporization of the fuel from the injector 1 2 upon resumption of engine operation.
  • Figure 2 illustrates an application of the arrangement 1 0 to a duct 28 bent output of a turbocharger fitted to the vehicle.
  • the upstream end 1 8 of the duct is constituted by a first fastening flange of the duct of the turbocharger 28 and the downstream end 20 of the duct is constituted by a second flange for fastening the duct of the turbocompressor 28.
  • the projecting element 24 comprises a plurality of ribs 26 which are arranged in a bend 30 of the conduit 28 of the turbocharger, to the right of a bore 32 for receiving an injector (not shown).
  • the ribs 26 are arranged partially in a theoretical helix profile, that is to say that they follow the helix profile and do not extend over the entire periphery of the inner wall of the bend 30 of the duct.
  • the invention thus makes it possible to substantially improve the regeneration performance of a particulate filter element by means of reduced fuel injection.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention provides an arrangement (10) for the pollution control of a motor vehicle internal combustion engine, of the type which comprises at least one exhaust line, which comprises at least one fuel injector (12), arranged in a given conduit (14) of the exhaust line upstream of a particle-filtering element, for producing a mixture of fuel and exhaust gas that is intended to be ignited in the filtering element, characterized in that the given conduit (14) comprises on its internal wall (22) a projecting element (24), arranged substantially so as to face the injector (12), which is intended to promote the vaporization of the fuel in the mixture.

Description

"Agencement pour la dépollution d'un moteur thermique comportant un conduit muni d'un élément en saillie" "Arrangement for the depollution of a heat engine having a duct provided with a projecting element"
L'invention concerne un agencement pour la dépollution d'un moteur thermique de véhicule automobile. L'invention concerne plus particulièrement un agencement pour la dépollution d'un moteur thermique de véhicule automobile, du type qui comporte au moins une ligne d'échappement, agencée en aval d'un moteur thermique du véhicule, qui comporte au moins un catalyseur et un élément de filtrage des particules contenues dans les gaz d'échappement dudit moteur, du type qui comporte au moins un dispositif d'injection de carburant, agencé dans un conduit déterminé de la ligne d'échappement en amont de l'élément de filtrage des particules, comportant un injecteur qui est destiné à réaliser dans le conduit un mélange de carburant et de gaz d'échappement destiné à être enflammé dans l'élément de filtrage des particules pour provoquer dans ledit élément de filtrage une élévation de température permettant de supprimer les particules contenues dans ledit élément de filtrage.The invention relates to an arrangement for the depollution of a motor vehicle engine. The invention relates more particularly to an arrangement for the depollution of a motor vehicle engine, of the type which comprises at least one exhaust line, arranged downstream of a heat engine of the vehicle, which comprises at least one catalyst and a particle filtering element contained in the exhaust gas of said engine, of the type which comprises at least one fuel injection device, arranged in a determined duct of the exhaust line upstream of the filter element of the particles, comprising an injector which is intended to produce a mixture of fuel and exhaust gas in the duct intended to be ignited in the particle filtering element in order to cause in said filtering element a rise in temperature which makes it possible to suppress the particles contained in said filter element.
On connaît de nombreux exemples d'agencements de ce type.Many examples of arrangements of this type are known.
Dans ce type d'agencement, le carburant injecté par le dispositif d'injection de carburant est injecté dans un conduit déterminé dont les parois internes sont généralement lisses. Il s'ensuit une mauvaise vaporisation du carburant, qui a tendance a s'accumuler sous forme liquide sur les parois internes du conduit sans s'évaporer complètement. De ce fait, il est nécessaire d'injecter des quantités élevées de carburant pour parvenir à un mélange contenant suffisamment de carburant pour être à même d'élever suffisamment la température au sein de l'élément de filtrage à particules.In this type of arrangement, the fuel injected by the fuel injection device is injected into a determined conduit whose inner walls are generally smooth. This results in poor vaporization of the fuel, which tends to accumulate in liquid form on the internal walls of the duct without evaporating completely. Therefore, it is necessary to inject large amounts of fuel to achieve a mixture containing sufficient fuel to be able to raise sufficiently the temperature within the particulate filter element.
Cette conception est particulièrement pénalisante, tant en termes de consommation de carburant qu'en termes de pollution de l'environnement, le carburant liquide non vaporisé étant alors rejeté par l'échappement du véhicule sans avoir été enflammé.This design is particularly penalizing, both in terms of fuel consumption and pollution from the environment, the non-vaporized liquid fuel is then rejected by the vehicle exhaust without being ignited.
L'invention remédie à cet inconvénient en proposant un agencement comportant des moyens d'améliorer la vaporisation du carburant injecté.The invention overcomes this disadvantage by proposing an arrangement comprising means for improving the vaporization of the injected fuel.
Dans ce but, l'invention propose un agencement du type décrit précédemment, caractérisé en ce que le conduit comporte sur sa paroi interne un élément en saillie, agencé sensiblement en regard de l'injecteur, qui est destiné à favoriser la vaporisation du carburant dans le mélange en augmentant la surface d'échange entre gaz d'échappement et carburant sur la paroi interne du conduit et en créant des turbulences dans l'écoulement du mélange.For this purpose, the invention proposes an arrangement of the type described above, characterized in that the conduit has on its inner wall a protruding element arranged substantially facing the injector, which is intended to promote the vaporization of the fuel in the mixture by increasing the exchange surface between the exhaust gas and fuel on the inner wall of the duct and creating turbulence in the flow of the mixture.
Selon d'autres caractéristiques de l'invention : - l'élément en saillie est agencé dans une zone de la paroi interne du conduit délimitée par un cône de pulvérisation de l'injecteur,According to other characteristics of the invention: the projecting element is arranged in a zone of the internal wall of the duct delimited by a spray cone of the injector,
- l'élément en saillie est constitué d'au moins une nervure,the projecting element consists of at least one rib,
- l'élément en saillie comporte une pluralité de nervures, - les nervu res sont agencées suivant u n profi l d'hélice dont le diamètre correspond au diamètre interne du conduit,the projecting element comprises a plurality of ribs; the ribs are arranged according to a propeller profile whose diameter corresponds to the internal diameter of the duct;
- l'élément en saillie est venu de matière avec le conduit,- the protruding element came from material with the conduit,
- le conduit est réalisé par un procédé de fonderie et l'élément en saillie est moulé avec le conduit, - le conduit est réalisé en fonte.- The duct is made by a foundry process and the protruding element is molded with the duct, - the duct is made of cast iron.
- le conduit est u n conduit coudé de sortie d'u n tu rbocompresseu r équipant le véhicu le.the duct is an angled outlet duct of a radiocompressor equipping the vehicle.
D'autres caractéristiques et avantages de l'i nvention apparaîtront à la lecture de la description détaillée qui suit pour la compréhension de laquelle on se reportera aux dessi ns annexés dans lesquels :Other characteristics and advantages of the invention will become apparent on reading the detailed description which follows for the understanding of which reference will be made to the appended drawings in which:
- la figure 1 est u ne vue schématique d'u n agencement selon l'invention, - la figure 2 est une vue en perspective d'un agencement selon l'invention adapté à un conduit coudé de sortie d'un turbocompresseur.FIG. 1 is a diagrammatic view of an arrangement according to the invention; - Figure 2 is a perspective view of an arrangement according to the invention adapted to a curved outlet duct of a turbocharger.
Dans la description qui va suivre, des chiffres de référence identiques désignent des pièces identiques ou ayant des fonctions similaires.In the following description, like reference numerals designate like parts or having similar functions.
On a représenté à la figure 1 une partie d'un agencement 10 pour la dépollution d'un moteur thermique de véhicule automobile. De manière connue l'agencement 10 comporte au moins une ligne d'échappement, agencée en aval d'un moteur thermique du véhicule (non représenté), qui comporte au moins un catalyseur et un élément de filtrage des particules contenues dans les gaz d'échappement dudit moteur (non représentés). L'agencement 10 qui comporte au moins un dispositif 12 d'injection de carburant, notamment un injecteur 12 dont un nez 14 débouche dans un conduit 16 déterminé de la ligne d'échappement en amont de l'élément de filtrage des particules.There is shown in Figure 1 a portion of an arrangement 10 for the pollution of a motor vehicle engine. In known manner the arrangement 10 comprises at least one exhaust line, arranged downstream of a vehicle engine (not shown), which comprises at least one catalyst and a filter element of the particles contained in the exhaust gases. exhaust of said engine (not shown). The arrangement 10 which comprises at least one fuel injection device 12, in particular an injector 12, a nose 14 of which opens into a duct 16 determined from the exhaust line upstream of the particle filtering element.
En particulier, le conduit 16 comporte une extrémité amont 18 qui est reliée par exemple à un collecteur d'échappement du moteur, et une extrémité aval 20 qui est reliée à une entrée élément de filtrage des particules (non représenté).In particular, the duct 16 comprises an upstream end 18 which is connected for example to an exhaust manifold of the engine, and a downstream end 20 which is connected to a particle filter element inlet (not shown).
L'injecteur 12 est destiné à réaliser dans le conduit 16 déterminé un mélange de carburant et de gaz d'échappement qui est destiné à être enflammé dans l'élément de filtrage des particules pour provoquer dans ledit élément de filtrage une élévation de température permettant de supprimer les particules contenues dans ledit élément de filtrage.The injector 12 is intended to produce in the conduit 16 determined a mixture of fuel and exhaust gas which is intended to be ignited in the particle filtering element to cause in said filter element a temperature rise allowing remove the particles contained in said filter element.
Conformément à l'invention, le conduit 16 déterminé comporte sur sa paroi interne 22 un élément 24 en saillie, agencé sensiblement en regard de l'injecteur 12, qui est destiné à favoriser la vaporisation du carburant dans le mélange en augmentant la surface d'échange entre la carburant liquide et les gaz d'échappement sur la paroi interne 22 du conduit.According to the invention, the conduit 16 determined has on its inner wall 22 a projecting element 24, arranged substantially facing the injector 12, which is intended to promote the vaporization of the fuel in the mixture. increasing the exchange surface between the liquid fuel and the exhaust gas on the inner wall 22 of the duct.
Avantageusement, l'élément 24 en saillie permet aussi de créer des turbulences dans l'écoulement du mélange, ce qui favorise le brassage du carburant liquide dans les gaz d'échappement, et par conséquent favorise la vaporisation du carburant dans les gaz d'échappement.Advantageously, the protruding element 24 also makes it possible to create turbulence in the flow of the mixture, which promotes mixing of the liquid fuel in the exhaust gas, and consequently promotes the vaporization of the fuel in the exhaust gas. .
Plus particulièrement, pour favoriser de manière optimale la vaporisation du carburant, qui est initialement issu de l'injecteur 12 sous la forme de gouttelettes, l'élément 24 en saillie est agencé dans une zone 26 de la paroi interne du conduit qui est délimitée par un cône 28 d'angle "α" de pulvérisation de l'injecteur 12.More particularly, to optimally promote the vaporization of the fuel, which is initially derived from the injector 12 in the form of droplets, the projecting element 24 is arranged in an area 26 of the inner wall of the duct which is delimited by a cone 28 of "α" angle of spray of the injector 12.
Cette configuration permet de limiter la zone 26 à la stricte zone nécessaire à la réalisation du mélange entre le carburant issu de l'injecteur 12 et les gaz d'échappement, sans perturber outre mesure l'écoulement gazeux à un quelconque autre endroit du conduit déterminé.This configuration makes it possible to limit the zone 26 to the strict zone necessary for the mixing of the fuel coming from the injector 12 and the exhaust gases, without unduly disturbing the gas flow at any other point in the determined duct. .
Dans le mode de réalisation préféré de l'invention, l'élément 24 en saillie est constitué d'au moins une nervure 26.In the preferred embodiment of the invention, the projecting element 24 consists of at least one rib 26.
Chaque nervure 26 permet d'augmenter les surfaces d'échange entre la paroi interne 22 du conduit 16 déterminé et le carburant liquide, qui se trouve alors vaporisé du fait de la température élevée à laquelle est soumis le conduit 16. De préférence, il sera compris que l'efficacité de l'agencement 10 sera d'autant accrue que l'élément 24 en saillie comporte une pluralité de nervures 26.Each rib 26 makes it possible to increase the exchange surfaces between the internal wall 22 of the pipe 16 determined and the liquid fuel, which is then vaporized because of the high temperature to which the pipe 16 is subjected. Preferably, it will be understood that the efficiency of the arrangement 10 will be increased as the element 24 projecting comprises a plurality of ribs 26.
Tout mode de réalisation connu de l'état de la technique peut convenir à la bonne réalisation des nervures 26. Toutefois, dans le mode de réalisation préféré de l'invention, les nervures 26 sont agencées suivant un profil d'hélice dont le diamètre correspond au diamètre interne du conduit 16. Cette configuration est étudiée pour favoriser une vaporisation aussi complète que possible des gouttelettes de carburant liquide qui sont reçues sur les nervures 26 du conduit 1 6. En effet, à la différence de nervures 26 parallèles qui favoriseraient une stagnation du carburant liquide, les nervures 26 en hélice permettent de favoriser un entraînement du carburant liquide par les gaz d'échappement le long du profil d'hélice des rainures en évitant qu'il ne stagne, ce qui conduit inévitablement à sa vaporisation au fur et à mesure qu'il s'étend le long du profil d'hélice des nervures 26.Any embodiment known from the state of the art may be suitable for the good realization of the ribs 26. However, in the preferred embodiment of the invention, the ribs 26 are arranged in a helix profile whose diameter corresponds to to the internal diameter of the duct 16. This configuration is designed to promote a vaporization as complete as possible of the liquid fuel droplets that are received on the ribs 26 of the duct 1 6. In fact, unlike parallel ribs 26 which would promote stagnation of the liquid fuel, the ribs 26 in a helix make it possible to encourage a drive of the liquid fuel by the exhaust gases along the spiral profile of the grooves, preventing it from stagnating, which inevitably leads to its vaporization as it progresses. extends along the helix profile of the ribs 26.
Par ailleurs, dans le mode de réalisation préféré de l'invention, l'élément 24 en saillie est venu de matière avec le conduit 1 6. Cette configuration garantit une transmission optimale de la chaleur du conduit 1 6 aux nervures 26. De préférence, le conduit 1 6 est réalisé par un procédé de fonderie et l'élément 24 en saillie est moulé avec le conduit 16. Cette configuration permet d'obtenir un conduit 1 6 d'un coût de fabrication réduit.Furthermore, in the preferred embodiment of the invention, the protruding element 24 is integral with the conduit 1 6. This configuration ensures optimum heat transfer from the conduit 1 6 to the ribs 26. Preferably, the conduit 1 6 is made by a casting process and the element 24 projecting is molded with the conduit 16. This configuration provides a conduit 1 6 of a reduced manufacturing cost.
Avantageusement, le conduit 16 est réalisé en fonte, qui présente une capacité calorifique élevée, ceci permettant au conduit 1 6 de conserver une température élevée longtemps après l'arrêt du moteur du véhicule, pour permettre une nouvelle vaporisation du carburant issu de l'injecteur 1 2 dès la reprise du fonctionnement du moteur. La figu re 2 illustre u ne application de l'agencement 1 0 à un conduit 28 coudé de sortie d'un turbocompresseur équipant le véhicule. Comme on peut le voir, l'extrémité amont 1 8 du conduit est constitué d'une première semelle de fixation du conduit du turbocompresseur 28 et l'extrémité aval 20 du conduit est constituée d'une seconde semelle de fixation du conduit du turbocompresseur 28. L'élément 24 en saillie comporte une pluralité de nervures 26 qui sont agencées dans un coude 30 du conduit 28 du turbocompresseur, au droit d'un perçage 32 de réception d'un injecteur (non représenté).Advantageously, the duct 16 is made of cast iron, which has a high heat capacity, this allowing the conduit 1 6 to maintain a high temperature long after stopping the engine of the vehicle, to allow a new vaporization of the fuel from the injector 1 2 upon resumption of engine operation. Figure 2 illustrates an application of the arrangement 1 0 to a duct 28 bent output of a turbocharger fitted to the vehicle. As can be seen, the upstream end 1 8 of the duct is constituted by a first fastening flange of the duct of the turbocharger 28 and the downstream end 20 of the duct is constituted by a second flange for fastening the duct of the turbocompressor 28. The projecting element 24 comprises a plurality of ribs 26 which are arranged in a bend 30 of the conduit 28 of the turbocharger, to the right of a bore 32 for receiving an injector (not shown).
Les nervures 26 sont agencées partiellement suivant un profil d'hélice théorique, c'est à dire qu'elle suivent le profil d'hélice lais ne s'étendent pas sur toute la périphérie de la paroi interne du coude 30 du conduit.The ribs 26 are arranged partially in a theoretical helix profile, that is to say that they follow the helix profile and do not extend over the entire periphery of the inner wall of the bend 30 of the duct.
L'invention permet donc d'améliorer sensiblement les performances de régénération d'un élément de filtrage à particules à l'aide d'une injection réduite de carburant. The invention thus makes it possible to substantially improve the regeneration performance of a particulate filter element by means of reduced fuel injection.

Claims

REVENDICATIONS
1. Agencement (10) pour la dépollution d'un moteur thermique de véhicule automobile, du type qui comporte au moins une ligne d'échappement, agencée en aval d'un moteur thermique du véhicule, qui comporte au moins un catalyseur et un élément de filtrage des particules contenues dans les gaz d'échappement dudit moteur, du type qui comporte au moins un dispositif d'injection de carburant, agencé dans un conduit (14) déterminé de la ligne d'échappement en amont de l'élément de filtrage des particules, comportant un injecteur (12) qui est destiné à réaliser dans le conduit (14) déterminé un mélange de carburant et de gaz d'échappement destiné à être enflammé dans l'élément de filtrage des particules pour provoquer dans ledit élément de filtrage une élévation de température permettant de supprimer les particules contenues dans ledit élément de filtrage, caractérisé en ce que le conduit (14) déterminé comporte sur sa paroi interne un élément (24) en saillie, agencé sensiblement en regard de l'injecteur (12), qui est destiné à favoriser la vaporisation du carburant dans le mélange en augmentant la surface d'échange entre carburant et gaz d'échappement sur la paroi interne (22) du conduit (14) et en créant des turbulences dans l'écoulement du mélange.1. Arrangement (10) for the depollution of a motor vehicle engine, of the type which comprises at least one exhaust line, arranged downstream of a heat engine of the vehicle, which comprises at least one catalyst and an element filtering particles contained in the exhaust gas of said engine, of the type which comprises at least one fuel injection device, arranged in a conduit (14) determined from the exhaust line upstream of the filter element particles, comprising an injector (12) which is intended to produce in the conduit (14) a mixture of fuel and exhaust gas to be ignited in the particle filter element to cause in said filter element an elevation of temperature enabling the particles contained in said filtering element to be removed, characterized in that the duct (14) determined has on its inner wall an element (24) in the form of 11ie, arranged substantially facing the injector (12), which is intended to promote the vaporization of the fuel in the mixture by increasing the exchange surface between fuel and exhaust gas on the inner wall (22) of the duct ( 14) and creating turbulence in the flow of the mixture.
2. Agencement selon la revendication 1, caractérisé en ce que l'élément (24) en saillie est agencé dans une zone de la paroi interne (22) du conduit (14) déterminé délimitée par un cône (28) de pulvérisation de l'injecteur (12).2. Arrangement according to claim 1, characterized in that the element (24) projecting is arranged in a zone of the inner wall (22) of the duct (14) defined delimited by a cone (28) spraying the injector (12).
3. Agencement selon l'une des revendications précédentes, caractérisé en ce que l'élément (24) en saillie est constitué d'au moins une nervure (26). 3. Arrangement according to one of the preceding claims, characterized in that the element (24) projecting consists of at least one rib (26).
4. Agencement selon la revendication précédente, caractérisé en ce que l'élément (24) en saillie comporte une pluralité de nervures (26) 4. Arrangement according to the preceding claim, characterized in that the element (24) projecting comprises a plurality of ribs (26)
5. Agencement selon la revendication précédente, caractérisé en ce que les nervures (26) sont agencées suivant un profil d'hélice dont le diamètre correspond au diamètre interne du conduit (1 6) déterminé. 5. Arrangement according to the preceding claim, characterized in that the ribs (26) are arranged in a helix profile whose diameter corresponds to the internal diameter of the conduit (1 6) determined.
6. Agencement selon l'une des revendications 1 à 5, caractérisé en ce que l'élément (24) en saillie est venu de matière avec le conduit (1 6) déterminé.6. Arrangement according to one of claims 1 to 5, characterized in that the element (24) projecting is integral with the conduit (1 6) determined.
7. Agencement selon la revendication précédente, caractérisé en ce que le conduit (16) déterminé est réalisé par un procédé de fonderie et en ce que l'élément (24) en saillie est moulé avec le conduit (16) déterminé.7. Arrangement according to the preceding claim, characterized in that the duct (16) determined is carried out by a casting process and in that the element (24) projecting is molded with the duct (16) determined.
8. Agencement selon la revendication précédente, caractérisé en ce que le conduit (16) déterminé est réalisé en fonte. 8. Arrangement according to the preceding claim, characterized in that the duct (16) determined is made of cast iron.
9. Agencement selon l'une des revendications précédentes, caractérisé en ce que le conduit déterminé est un conduit (28) coudé de sortie d'un turbocompresseur équipant le véhicule. 9. Arrangement according to one of the preceding claims, characterized in that the determined conduit is a duct (28) angled output of a turbocharger fitted to the vehicle.
EP07823670A 2006-09-21 2007-07-31 Arrangement for the pollution control of an internal combustion engine comprising a conduit provided with a projecting element Withdrawn EP2064421A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0653861A FR2906306B1 (en) 2006-09-21 2006-09-21 ARRANGEMENT FOR THE DEPOLLUTION OF A THERMAL MOTOR COMPRISING A CONDUIT PROVIDED WITH A GROWING ELEMENT
PCT/FR2007/051758 WO2008034982A1 (en) 2006-09-21 2007-07-31 Arrangement for the pollution control of an internal combustion engine comprising a conduit provided with a projecting element

Publications (1)

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EP2064421A1 true EP2064421A1 (en) 2009-06-03

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EP07823670A Withdrawn EP2064421A1 (en) 2006-09-21 2007-07-31 Arrangement for the pollution control of an internal combustion engine comprising a conduit provided with a projecting element

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WO (1) WO2008034982A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102007020812B4 (en) 2007-05-04 2010-01-14 Audi Ag Apparatus and method for the addition of fluid pollutant-reducing media in an exhaust passage of an internal combustion engine
DE102008001212A1 (en) * 2008-04-16 2009-10-22 Robert Bosch Gmbh Device for feeding a reagent into an exhaust pipe of an exhaust system of a motor vehicle
FR2948297A3 (en) * 2009-07-21 2011-01-28 Renault Sa Mixing device i.e. mixer, for mixing fuel injected in exhaust duct in exhaust line of internal combustion engine, has two blades placed in bent part of exhaust tube of duct to create opposing rotational movements in flow of exhaust gas

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Publication number Priority date Publication date Assignee Title
ZA904363B (en) * 1989-06-24 1991-03-27 Degussa Process for the regeneration of soot filters on diesel engines
DE102004004738A1 (en) * 2004-01-30 2005-08-18 Robert Bosch Gmbh Method and device for the after-treatment of an exhaust gas of an internal combustion engine

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Title
See references of WO2008034982A1 *

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FR2906306B1 (en) 2008-12-12
FR2906306A1 (en) 2008-03-28

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