EP3710688B1 - Powertrain with improved pollutant removal system - Google Patents

Powertrain with improved pollutant removal system Download PDF

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Publication number
EP3710688B1
EP3710688B1 EP18789166.8A EP18789166A EP3710688B1 EP 3710688 B1 EP3710688 B1 EP 3710688B1 EP 18789166 A EP18789166 A EP 18789166A EP 3710688 B1 EP3710688 B1 EP 3710688B1
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EP
European Patent Office
Prior art keywords
casing
tubular wall
pollution control
control system
enclosure
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.)
Active
Application number
EP18789166.8A
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German (de)
French (fr)
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EP3710688A1 (en
Inventor
Eric Dumas
Acacio MARTINS
Xavier Decomble
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
Nissan Motor Co Ltd
Original Assignee
Renault SAS
Nissan Motor Co Ltd
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Publication of EP3710688A1 publication Critical patent/EP3710688A1/en
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Publication of EP3710688B1 publication Critical patent/EP3710688B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/11—Manufacture or assembly of EGR systems; Materials or coatings specially adapted for EGR systems
    • 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
    • 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
    • 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
    • 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
    • F01N3/103—Oxidation catalysts for HC and CO only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/12—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems characterised by means for attaching parts of an EGR system to each other or to engine parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers
    • 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
    • F01N2240/02—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 heat exchanger

Definitions

  • the invention relates to an improved pollution control system for a power train with a heat engine.
  • the invention relates more particularly to a catalytic converter for a thermal engine pollution control system.
  • the invention relates to a motor vehicle provided with a powertrain with an improved pollution control system.
  • a motor vehicle provided with a powertrain has been subjected for several years to severe constraints in terms of pollution control in order to reduce as much as possible the emissions of polluting gases into the atmosphere such as nitrogen oxides and monoxides. and / or carbon.
  • a powertrain comprises a heat engine, and the pollution control system is placed on an exhaust line of said engine.
  • a pollution control system comprises a particulate filter (FAP) and an oxidation catalyst (DOC) also known under the name of catalytic converter mounted in series on the exhaust line.
  • FAP particulate filter
  • DOC oxidation catalyst
  • the gases leaving the low pressure pollution control system are very hot, which reduces the mass of the gases before they enter the engine intake circuit and therefore the efficiency of said engine. It is known to add a burnt gas cooler to the low pressure burnt gas recirculation circuit.
  • the cooler can be a water-air exchanger in which the air, here the burnt gases, transfers a calorific quantity to the water which carries this heat, for example to a radiator generally on the front face of the vehicle.
  • the publications FR3041033-A1 and US4912928-A offer a heat exchanger connected to a catalyst with the aim of reducing the size of the heat exchanger, reducing the overall size of the exchanger, lowering the production cost and reducing the space of the heat exchanger. installation. Said exchanger is installed downstream of the catalyst and the document does not propose a compact arrangement of the gas recirculation device which comprises a catalyst and an exchanger.
  • a part connector of the water-air exchanger is pushed into an outlet of the pollution control system.
  • This connector then forms a large protuberance in a chamber at the outlet of the depollution system, here a catalytic converter altering the circulation of the depolluted gases at the outlet to form zones with low gas circulation speed and high temperatures.
  • the gases arriving in this zone are very hot.
  • they help to heat the wall of the water-air exchanger and form a high temperature zone which disturbs the operation of the cooler: in fact, the water is brought to high temperature and therefore does not evacuate the heat from the cooler. gas with the expected efficiency, which leads to lower efficiency in reducing polluting gas emissions.
  • the object of the invention is to remedy these problems and one of the objects of the invention is a powertrain with a pollution control system with improved cooling of the burnt gases.
  • the present invention relates to a system for recirculating burnt gases from a heat engine of a motor vehicle, downstream of a pollution control system.
  • the present invention relates more particularly to a device for recirculating the burnt gases of a motor vehicle powertrain comprising a casing of a flue gas pollution control system and a heat exchanger configured according to claim 1.
  • the burnt gas recirculation device provides a casing surrounding a tubular wall of a connection end piece of an element of the burnt gas recirculation circuit in order to protect said end piece from hot burnt gases and in particular the tubular wall embedded in the housing of the pollution control system.
  • the device comprises a layer of thermal insulation placed between the casing and the tubular wall in order to obtain optimum thermal protection of the end piece.
  • the figure 1 represents a device for recirculating the burnt gases resulting from the combustion of a mixture of air and fuel in a combustion chamber of a thermal or internal combustion engine (not shown).
  • the heat engine of a motor vehicle comprises a cylinder block surmounted by a cylinder head.
  • the cylinder block In the cylinder block are hollowed out cylinders in each of which slides a piston.
  • the volume delimited by the wall of the cylinder, the piston and a lower wall of the cylinder head forms a combustion chamber.
  • fuel and gases composed mainly of fresh air and recirculated gases to form a mixture which is compressed by the rise of the piston to be subsequently burned.
  • the burnt gases escape via exhaust ducts controlled by exhaust valves to an exhaust manifold capable of directing said burnt gases to a pollution control system 100.
  • the pollution control system can comprise various pollution control elements, one of which is one. catalyst associated with a particulate filter for example, said elements are housed inside a substantially cylindrical housing 101.
  • the burnt gases undergo the depollution treatment as they pass through the depollution elements and a part of said burnt gases at the outlet of the depollution system 100 is taken up to be returned to the air intake of the engine in order to reduce gas emissions. pollutants, thanks to a recirculation circuit 10 of the burnt gases.
  • the circuit for recirculating the burnt gases taken downstream according to the direction of flow of the burnt gases from the pollution control system is called “low pressure”.
  • Another circuit can also return burnt gases to the engine intake but upstream of the pollution control system and is said to be “high pressure”.
  • the invention relates to the “low pressure” burnt gas recirculation circuit.
  • the gases leaving the pollution control system 100 are very hot, which reduces the mass of the gases before they enter the engine intake circuit and therefore the efficiency of said engine.
  • a burnt gas cooler can be a water-air exchanger 102 in which the burnt gases transfer a calorific quantity to the water which carries away this heat for example to a radiator (not shown) generally on the front face of the vehicle.
  • the burnt gas recirculation circuit comprises various recirculation elements including an EGR valve for “Exhaust gas recirculation” or burnt gas recirculation, a cooler 102 of said gases.
  • the figure 2 shows the connection of the water-gas exchanger 102 of the device 10 for recirculating the burnt gases with the depollution system 100.
  • the cooler 102 comprises a substantially cylindrical connection end piece 11 surrounding longitudinal gas conduits 104 which are bathed in a transfer chamber 103 filled with cooling liquid.
  • the cooling liquid is water-based and enters said transfer chamber 103 through an inlet opening 105 and leaves it through an outlet 106 to then be led to a radiator (not shown).
  • connection end piece 11 comprises a tubular wall 12 and is driven through an outlet opening 107 in a substantially conical outlet wall 108 of the casing 101 of the pollution control system.
  • a portion of the hot gases is directed by the conical wall 108 of the casing 101 and strike laterally said tubular wall 12 of the nozzle to form a zone of high temperatures affecting the thermal characteristics of the cooling liquid, in contact.
  • the invention proposes a protection of the tubular wall 12 of the connection end piece 11 against this part of burnt gases.
  • the figures 3 and 4 represent a first embodiment of the invention.
  • the recirculation device 10 according to the invention comprises a casing 14 formed by a metal sheet, for example made of stainless steel sheet of low thickness between 0.2mm and 0.5mm.
  • Said envelope 14 surrounds the tubular wall 12 of the connection end piece 11 when the latter is mounted and pressed into the wall 108 of the housing 101.
  • the envelope 14 is tubular to allow the housing of the connection end piece.
  • the casing has an outer wall 15 in contact with the burnt gases, capable of deflecting the burnt gases in a direction opposite to the tubular wall 12.
  • the term “direction opposite to the wall” is understood to mean. tubular ”a direction away from the tubular wall.
  • Said outer wall 15 may have a substantially conical shape with a deflection angle ⁇ for example to substantially form a deflector 16 of the burnt gas flows.
  • the casing 14 is separated from the tubular wall 12 of the connection end piece 11. In this way, no heat transfer by thermal conduction between the casing 14 and the tubular wall 12 can be effected.
  • the inside diameter of the casing 14 is substantially equal to the outside diameter of the connection end piece 11.
  • no hot gas flow circulates between the casing and the tubular wall of the end piece.
  • the casing 14 is part of the casing 101 of the pollution control system 100.
  • the casing 14 is substantially cylindrical with one end 17 turned towards the pollution control system slightly constricted and comprising claws 18 for fixing.
  • the casing 14 is easily gripped to the connection end piece 11 when said end piece is pressed into the wall 108 of the casing 101.
  • the fixing claws 18 also allow optimum positioning of the casing 14 relative to the tubular wall 12 of the casing.
  • Said separation 19 or separation space is filled with a layer of air or gas forming an insulating layer between the casing and the tubular wall.
  • the separation space may be closed or of suitable size to prevent gas from circulating in said separation space 19.
  • the thickness of said space is very small, of the order of one mm, or access to said space is very small. separation is closed or covered by the envelope 14.
  • the casing 14 is part of the connection end piece 11.
  • the casing 14 is formed by a metal sheet wound around the tubular wall 12 of the connection end piece. It rests only on the longitudinal ends 17,17 'of the nozzle and is separated from the tubular wall 12 to form a separation space 19 between the casing 14 and the tubular wall 12 of the connection end piece.
  • the envelope may be formed by a cylindrical metal sheet shown in figure 6 , it is wound or threaded around the tubular wall 12 as shown in figure 7 .
  • the separation space 19 between the casing 14 and the tubular wall 12 is thin and can be filled with air or with a layer of thermal insulation 21 such as a layer based on glass fibers and resins. high temperatures or ceramic.
  • the casing 14 can extend along the axis of the nozzle over a length greater than the length of insertion 20 of the nozzle 11 in the housing 101, that is to say that the casing 14 protrudes outside the casing 101 of the pollution control system 100 to increase the thermal insulation of the connection end piece and improve the efficiency of the exchanger.
  • the casing covering the portion of the connection end piece of the exchanger pushed into the casing allows thermal protection of said end piece against hot gas flows impinging on the side tubular wall of said end piece, said envelope being easy to manufacture and install.
  • the thickness of the insulating layer placed between the casing and the tubular wall can be increased, which nevertheless necessitates increasing the opening of the housing of the pollution control system.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Toxicology (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Description

Domaine technique de l'inventionTechnical field of the invention

L'invention se rapporte à un système de dépollution amélioré d'un groupe motopropulseur avec un moteur thermique.The invention relates to an improved pollution control system for a power train with a heat engine.

L'invention concerne plus particulièrement un pot catalytique de système de dépollution de moteur thermique.The invention relates more particularly to a catalytic converter for a thermal engine pollution control system.

L'invention concerne un véhicule automobile doté d'un groupe motopropulseur avec un système de dépollution amélioré.The invention relates to a motor vehicle provided with a powertrain with an improved pollution control system.

Etat de la techniqueState of the art

De manière générale, un véhicule automobile pourvu d'un groupe motopropulseur est soumis depuis quelques années déjà à des contraintes fortes en matière de dépollution afin de réduire au maximum les rejets de gaz polluants dans l'atmosphère tels que les oxydes et monoxydes d'azote et/ou de carbone. Un tel groupe motopropulseur comprend un moteur thermique, et le système de dépollution est placé sur une ligne d'échappement dudit moteur. Un tel système de dépollution comprend un filtre (FAP) à particules et un catalyseur d'oxydation (DOC) connu aussi sous la dénomination de pot catalytique montés en série sur la ligne d'échappement.In general, a motor vehicle provided with a powertrain has been subjected for several years to severe constraints in terms of pollution control in order to reduce as much as possible the emissions of polluting gases into the atmosphere such as nitrogen oxides and monoxides. and / or carbon. Such a powertrain comprises a heat engine, and the pollution control system is placed on an exhaust line of said engine. Such a pollution control system comprises a particulate filter (FAP) and an oxidation catalyst (DOC) also known under the name of catalytic converter mounted in series on the exhaust line.

Actuellement, la place disponible dans le véhicule à proximité du moteur pour installer ce système de dépollution est de plus en plus réduite à cause, d'une part, des volumes de dépollution augmentés du fait des normes de dépollution qui sont de plus en plus sévères, et d'autre part, des compartiments moteur qui deviennent plus exigus du fait de l'augmentation des fonctions qui y sont implantées et de l'accroissement des exigences en terme d'insonorisation. Il en résulte un encombrement de la ligne d'échappement occasionné par certains éléments constituant ce système de dépollution, et donc des pertes de charge importantes qui induisent une perte de puissance du moteur. En effet, ces éléments ont tendance à obturer partiellement la ligne d'échappement, empêchant les gaz d'échappement traités d'être évacués efficacement du véhicule, avec un débit suffisant.Currently, the space available in the vehicle near the engine to install this pollution control system is increasingly reduced due, on the one hand, to increased pollution control volumes due to pollution control standards which are increasingly stringent. , and on the other hand, engine compartments which become more cramped due to the increase in the functions installed therein and the increase in requirements in terms of soundproofing. This results in a bulkiness of the exhaust line caused by certain elements constituting this pollution control system, and therefore significant pressure drops which induce a loss of engine power. Indeed, these elements tend to partially block the exhaust line, preventing the treated exhaust gases from being effectively exhausted from the vehicle with sufficient flow.

De plus, de par la réduction du volume des éléments du système de dépollution, la circulation des gaz brulés à l'intérieur de ces éléments n'est pas idéale ou optimale et nuit à l'efficacité desdits éléments.In addition, due to the reduction in the volume of the elements of the pollution control system, the circulation of the burnt gases inside these elements is not ideal or optimal and is detrimental to the efficiency of said elements.

Les gaz en sortie du système de dépollution basse pression sont très chauds ce qui réduit la masse des gaz avant leur entrée dans le circuit d'admission du moteur et donc le rendement dudit moteur. Il est connu d'adjoindre au circuit de recirculation des gaz brulés basse pression un refroidisseur des gaz brulés. Le refroidisseur peut être un échangeur eau-air dans lequel l'air, ici les gaz brulés, transfère une quantité calorifique à l'eau qui emporte cette chaleur par exemple vers un radiateur généralement en face avant du véhicule.The gases leaving the low pressure pollution control system are very hot, which reduces the mass of the gases before they enter the engine intake circuit and therefore the efficiency of said engine. It is known to add a burnt gas cooler to the low pressure burnt gas recirculation circuit. The cooler can be a water-air exchanger in which the air, here the burnt gases, transfers a calorific quantity to the water which carries this heat, for example to a radiator generally on the front face of the vehicle.

Afin de réduire l'encombrement du groupe motopropulseur avec le système de dépollution, il est avantageux de fixer directement l'échangeur eau-air en sortie du système de dépollution. De cette façon les gaz sont aussitôt refroidis par l'eau qui traverse l'échangeur.In order to reduce the size of the powertrain with the pollution control system, it is advantageous to directly attach the water-air exchanger at the outlet of the pollution control system. In this way the gases are immediately cooled by the water which passes through the exchanger.

Les publications FR3041033-A1 et US4912928-A proposent un échangeur de chaleur connecté à un catalyseur dans le but de réduire l'encombrement de l'échangeur de chaleur, de réduire la taille globale de l'échangeur, d'abaisser le cout de production et de réduire l'espace de l'installation. Ledit échangeur est installé en aval du catalyseur et le document ne propose pas une disposition compacte du dispositif de recirculation des gaz qui comprend un catalyseur et un échangeur.The publications FR3041033-A1 and US4912928-A offer a heat exchanger connected to a catalyst with the aim of reducing the size of the heat exchanger, reducing the overall size of the exchanger, lowering the production cost and reducing the space of the heat exchanger. installation. Said exchanger is installed downstream of the catalyst and the document does not propose a compact arrangement of the gas recirculation device which comprises a catalyst and an exchanger.

Un connecteur pièce de l'échangeur eau-air est enfoncé dans une sortie du système de dépollution. Ce connecteur forme alors une protubérance importante dans une chambre en sortie du système de dépollution ici un pot catalytique altérant la circulation des gaz dépollués en sortie pour former des zones à faible vitesse de circulation des gaz et de températures hautes. En effet, les gaz arrivant dans cette zone sont très chauds. De ce fait ils contribuent à échauffer la paroi de l'échangeur eau-air et former une zone de hautes températures qui perturbe le fonctionnement du refroidisseur : en effet, l'eau est portée à haute température et n'évacue donc pas la chaleur des gaz avec l'efficacité attendue, ce qui entraine une efficacité moindre dans la réduction des rejets de gaz polluants.A part connector of the water-air exchanger is pushed into an outlet of the pollution control system. This connector then forms a large protuberance in a chamber at the outlet of the depollution system, here a catalytic converter altering the circulation of the depolluted gases at the outlet to form zones with low gas circulation speed and high temperatures. Indeed, the gases arriving in this zone are very hot. As a result, they help to heat the wall of the water-air exchanger and form a high temperature zone which disturbs the operation of the cooler: in fact, the water is brought to high temperature and therefore does not evacuate the heat from the cooler. gas with the expected efficiency, which leads to lower efficiency in reducing polluting gas emissions.

Le but de l'invention est de remédier à ces problèmes et un des objets de l'invention est un groupe motopropulseur avec un système de dépollution avec un refroidissement des gaz brulés amélioré.The object of the invention is to remedy these problems and one of the objects of the invention is a powertrain with a pollution control system with improved cooling of the burnt gases.

La présente invention concerne un système de recirculation de gaz brulés issus d'un moteur thermique de véhicule automobile, en aval d'un système de dépollution.The present invention relates to a system for recirculating burnt gases from a heat engine of a motor vehicle, downstream of a pollution control system.

Présentation de l'inventionPresentation of the invention

La présente invention concerne plus particulièrement un dispositif de recirculation de gaz brulés d'un groupe motopropulseur de véhicule automobile comprenant un carter d'un système de dépollution de gaz brûlés et un échangeur de chaleur configurés selon la revendication 1.The present invention relates more particularly to a device for recirculating the burnt gases of a motor vehicle powertrain comprising a casing of a flue gas pollution control system and a heat exchanger configured according to claim 1.

En particulier, selon l'invention, le dispositif de recirculation de gaz brulés propose une enveloppe entourant une paroi tubulaire d'un embout de connexion d'un élément du circuit de recirculation des gaz brulés afin de protéger des gaz chauds brulés ledit embout et notamment la paroi tubulaire enfoncée dans le carter du système de dépollution.In particular, according to the invention, the burnt gas recirculation device provides a casing surrounding a tubular wall of a connection end piece of an element of the burnt gas recirculation circuit in order to protect said end piece from hot burnt gases and in particular the tubular wall embedded in the housing of the pollution control system.

Selon d'autres caractéristiques de l'invention :

  • l'enveloppe est tubulaire.
According to other characteristics of the invention:
  • the envelope is tubular.

De manière avantageuse, l'enveloppe est tubulaire pour accueillir de façon optimale l'embout de connexion et notamment de recouvrir la paroi tubulaire dudit embout.

  • l'enveloppe est apte à réorienter les flux de gaz brulés en direction opposée à la paroi tubulaire.
Advantageously, the casing is tubular to optimally accommodate the connection end piece and in particular to cover the tubular wall of said end piece.
  • the envelope is able to redirect the flow of burnt gas in the direction opposite to the tubular wall.

De manière avantageuse, l'enveloppe est apte à réorienter et à rediriger des flux de gaz brulés dirigés vers la paroi tubulaire de l'embout vers une direction opposée afin d'éviter l'impact des flux de gaz directement sur ladite paroi tubulaire de l'embout, ce qui aurait pour conséquence un échauffement localisé dudit embout et donc une réduction de l'efficacité de la recirculation des gaz brulés.

  • l'enveloppe est de forme complémentaire à la paroi tubulaire de l'embout de connexion.
Advantageously, the casing is capable of reorienting and redirecting the flow of burnt gases directed towards the tubular wall of the nozzle towards an opposite direction in order to avoid the impact of the gas flows directly on said tubular wall of the nozzle. 'nozzle, which would result in a localized heating of said nozzle and therefore a reduction in the efficiency of the recirculation of the burnt gases.
  • the casing is of complementary shape to the tubular wall of the connection end piece.

De manière avantageuse, l'enveloppe présente une forme complémentaire à la paroi tubulaire de l'embout de connexion, ce qui permet de garder la compacité de l'ensemble du dispositif.

  • l'enveloppe est partie du carter du système de dépollution.
Advantageously, the casing has a shape complementary to the tubular wall of the connection end piece, which makes it possible to keep the compactness of the entire device.
  • the casing is part of the decontamination system housing.

De manière avantageuse, l'enveloppe est partie du carter du système de dépollution, issue par exemple de moulage. La fabrication et l'assemblage sont simplifiés.

  • l'enveloppe est partie de l'embout de connexion.
Advantageously, the casing is part of the housing of the pollution control system, resulting for example from molding. Manufacturing and assembly are simplified.
  • the casing is part of the connector end.

De manière avantageuse, l'enveloppe selon un autre mode de réalisation est partie de l'embout du système de dépollution, ladite enveloppe est alors rapportée autour dudit embout ; ce qui permet une adaptation simple de l'invention à un carter de système de dépollution et un embout existants.

  • l'enveloppe est formée par une feuille métallique.
Advantageously, the casing according to another embodiment is part of the nozzle of the pollution control system, said casing is then attached around said nozzle; which allows a simple adaptation of the invention to an existing pollution control system casing and nozzle.
  • the envelope is formed by a metal foil.

De manière avantageuse, l'enveloppe est formée par un enroulement de feuille métallique, ce qui permet une facilité de fabrication et une adaptation facile entre l'enveloppe et l'embout.

  • l'enveloppe séparée de la paroi tubulaire.
Advantageously, the envelope is formed by a winding of metal foil, which allows ease of manufacture and easy adaptation between the envelope and the nozzle.
  • the envelope separated from the tubular wall.

De manière avantageuse, l'enveloppe est séparée de la paroi tubulaire pour éviter des transferts de chaleur par conduction entre ladite enveloppe et la paroi tubulaire de l'embout.

  • le dispositif comprend une couche d'isolant thermique disposée entre l'enveloppe et la paroi tubulaire.
Advantageously, the casing is separated from the tubular wall to prevent heat transfers by conduction between said casing and the tubular wall of the end piece.
  • the device comprises a layer of thermal insulation placed between the casing and the tubular wall.

De manière avantageuse, le dispositif comprend une couche d'isolant thermique disposée entre l'enveloppe et la paroi tubulaire afin d'obtenir une protection thermique optimale de l'embout.Advantageously, the device comprises a layer of thermal insulation placed between the casing and the tubular wall in order to obtain optimum thermal protection of the end piece.

Brève description des figuresBrief description of the figures

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description qui suit de modes particuliers de réalisation de l'invention donnés à titre d'exemples non limitatifs et représentés sur les dessins annexés, dans lesquels :

  • la figure 1 est une vue schématique d'un dispositif de recirculation de gaz brulés avec un système de dépollution.
  • la figure 2 est une vue schématique de coupe longitudinale d'un embout de connexion d'un échangeur de chaleur avec une paroi tubulaire enfoncée dans une ouverture de sortie du carter du système de dépollution.
  • la figure 3 est une vue schématique en coupe longitudinale de l'enveloppe selon un mode de réalisation de l'invention.
  • la figure 4 est une vue schématique en coupe longitudinale de l'enveloppe avec l'embout selon le mode de réalisation de l'invention.
  • la figure 5 est une schématique de l'échangeur selon un deuxième mode de réalisation.
  • la figure 6 est une vue schématique de l'enveloppe selon le deuxième mode de réalisation.
  • la figure 7 est une vue schématique du dispositif de recirculation de gaz brulés avec le système de dépollution selon le deuxième mode de réalisation.
  • la figure 8 est une vus schématique de coupe longitudinale de l'embout selon le deuxième mode de réalisation.
Other characteristics and advantages of the invention will become apparent on reading the following description of particular embodiments of the invention given by way of non-limiting examples and shown in the appended drawings, in which:
  • the figure 1 is a schematic view of a burnt gas recirculation device with a pollution control system.
  • the figure 2 is a schematic longitudinal sectional view of a connection end piece of a heat exchanger with a tubular wall driven into an outlet opening of the housing of the pollution control system.
  • the figure 3 is a schematic longitudinal sectional view of the casing according to one embodiment of the invention.
  • the figure 4 is a schematic longitudinal sectional view of the casing with the nozzle according to the embodiment of the invention.
  • the figure 5 is a diagram of the exchanger according to a second embodiment.
  • the figure 6 is a schematic view of the envelope according to the second embodiment.
  • the figure 7 is a schematic view of the device for recirculating burnt gases with the pollution control system according to the second embodiment.
  • the figure 8 is a schematic longitudinal sectional view of the nozzle according to the second embodiment.

Description détaillée des figuresDetailed description of figures

Dans la description qui va suivre, des chiffres de référence identiques désignent des pièces identiques ou ayant des fonctions similaires.In the description which follows, identical reference numerals denote identical parts or having similar functions.

La figure 1 représente un dispositif de recirculation des gaz brulés issus de la combustion de mélange d'air et de carburant dans une chambre à combustion d'un moteur thermique ou à combustion interne (non représentés).The figure 1 represents a device for recirculating the burnt gases resulting from the combustion of a mixture of air and fuel in a combustion chamber of a thermal or internal combustion engine (not shown).

De manière générale, le moteur thermique d'un véhicule automobile comprend un carter-cylindres surmonté d'une culasse. Dans le carter-cylindres sont creusés des cylindres dans chacun desquels coulisse un piston. Le volume délimité par la paroi du cylindre, le piston et une paroi inférieure de la culasse forme une chambre à combustion. Dans ladite chambre sont injectés du carburant et des gaz composés d'air frais principalement et de gaz recirculés pour former un mélange qui est comprimé par la montée du piston pour être brulé ensuite. Les gaz brulés s'échappent via des conduits d'échappement contrôlés par des soupapes d'échappement vers un collecteur d'échappement apte à dirigés lesdits gaz brulés vers un système de dépollution 100. Le système de dépollution peut comprendre divers éléments de dépollution dont un catalyseur associé avec un filtre à particules par exemple, lesdits éléments sont logés à l'intérieur d'un carter 101 sensiblement cylindrique.In general, the heat engine of a motor vehicle comprises a cylinder block surmounted by a cylinder head. In the cylinder block are hollowed out cylinders in each of which slides a piston. The volume delimited by the wall of the cylinder, the piston and a lower wall of the cylinder head forms a combustion chamber. In said chamber are injected fuel and gases composed mainly of fresh air and recirculated gases to form a mixture which is compressed by the rise of the piston to be subsequently burned. The burnt gases escape via exhaust ducts controlled by exhaust valves to an exhaust manifold capable of directing said burnt gases to a pollution control system 100. The pollution control system can comprise various pollution control elements, one of which is one. catalyst associated with a particulate filter for example, said elements are housed inside a substantially cylindrical housing 101.

Les gaz brulés subissent le traitement de dépollution au passage au travers des éléments de dépollution et une partie desdits gaz brulés en sortie du système de dépollution 100 est reprise pour être ramenée dans l'admission d'air du moteur afin de réduire les émissions de gaz polluants, grâce à un circuit de recirculation 10 des gaz brulés. Le circuit de recirculation des gaz brulés prélevés en aval selon le sens d'écoulement des gaz brulés, du système de dépollution est dit « basse pression ». Un autre circuit peut également ramener des gaz brulés vers l'admission du moteur mais en amont du système de dépollution et est dit « haute pression ». L'invention concerne le circuit de recirculation des gaz brulés « basse pression ».The burnt gases undergo the depollution treatment as they pass through the depollution elements and a part of said burnt gases at the outlet of the depollution system 100 is taken up to be returned to the air intake of the engine in order to reduce gas emissions. pollutants, thanks to a recirculation circuit 10 of the burnt gases. The circuit for recirculating the burnt gases taken downstream according to the direction of flow of the burnt gases from the pollution control system is called “low pressure”. Another circuit can also return burnt gases to the engine intake but upstream of the pollution control system and is said to be “high pressure”. The invention relates to the “low pressure” burnt gas recirculation circuit.

Cependant, les gaz en sortie du système de dépollution 100 sont très chauds ce qui réduit la masse des gaz avant leur entrée dans le circuit d'admission du moteur et donc le rendement dudit moteur. Il est connu d'adjoindre au circuit de recirculation des gaz brulés basse pression un refroidisseur des gaz brulés. Le refroidisseur peut être un échangeur eau-air 102 dans lequel les gaz brulés transfèrent une quantité calorifique à l'eau qui emporte cette chaleur par exemple vers un radiateur (non représenté) généralement en face avant du véhicule.However, the gases leaving the pollution control system 100 are very hot, which reduces the mass of the gases before they enter the engine intake circuit and therefore the efficiency of said engine. It is known to add a burnt gas cooler to the low pressure burnt gas recirculation circuit. The cooler can be a water-air exchanger 102 in which the burnt gases transfer a calorific quantity to the water which carries away this heat for example to a radiator (not shown) generally on the front face of the vehicle.

Le circuit de recirculation des gaz brulés comprend différents éléments de recirculation parmi lesquels une vanne EGR pour «Exhaust gas recirculation » ou recirculation de gaz brulés, un refroidisseur 102 desdits gaz.The burnt gas recirculation circuit comprises various recirculation elements including an EGR valve for “Exhaust gas recirculation” or burnt gas recirculation, a cooler 102 of said gases.

La figure 2 présente la connexion de l'échangeur eau-gaz 102 du dispositif de recirculation 10 des gaz brulés avec le système de dépollution 100.The figure 2 shows the connection of the water-gas exchanger 102 of the device 10 for recirculating the burnt gases with the depollution system 100.

Le refroidisseur 102 comporte un embout de connexion 11 sensiblement cylindrique entourant des conduites longitudinales 104 de gaz qui sont baignées dans une chambre de transfert 103 remplie de liquide de refroidissement. Le liquide de refroidissement est à base d'eau et entre dans ladite chambre transfert 103 par une ouverture d'entrée 105 et en ressort par une issue 106 pour être conduit ensuite vers un radiateur (non représenté).The cooler 102 comprises a substantially cylindrical connection end piece 11 surrounding longitudinal gas conduits 104 which are bathed in a transfer chamber 103 filled with cooling liquid. The cooling liquid is water-based and enters said transfer chamber 103 through an inlet opening 105 and leaves it through an outlet 106 to then be led to a radiator (not shown).

L'embout de connexion 11 comporte une paroi tubulaire 12 et est enfoncé à travers une ouverture de sortie 107 dans une paroi 108 sensiblement conique de sortie du carter 101 du système de dépollution.The connection end piece 11 comprises a tubular wall 12 and is driven through an outlet opening 107 in a substantially conical outlet wall 108 of the casing 101 of the pollution control system.

Une partie des gaz chauds est dirigée par la paroi conique 108 du carter 101 et viennent frapper latéralement ladite paroi tubulaire 12 de l'embout pour former une zone de températures élevées affectant les caractéristiques thermiques du liquide de refroidissement, en contact.A portion of the hot gases is directed by the conical wall 108 of the casing 101 and strike laterally said tubular wall 12 of the nozzle to form a zone of high temperatures affecting the thermal characteristics of the cooling liquid, in contact.

L'invention propose une protection de la paroi tubulaire 12 de l'embout de connexion 11 contre cette partie de gaz brulés.The invention proposes a protection of the tubular wall 12 of the connection end piece 11 against this part of burnt gases.

Les figures 3 et 4 représentent un premier mode de réalisation de l'invention. Le dispositif de recirculation 10 selon l'invention comprend une enveloppe 14 formée par une feuille métallique par exemple en tôle en acier inox de faible épaisseur comprise entre 0.2mm et 0.5mm. Ladite enveloppe 14 entoure la paroi tubulaire 12 de l'embout de connexion 11 quand celui-ci est monté et enfoncé dans la paroi 108 du carter 101. L'enveloppe 14 est tubulaire pour permettre le logement de l'embout de connexion.The figures 3 and 4 represent a first embodiment of the invention. The recirculation device 10 according to the invention comprises a casing 14 formed by a metal sheet, for example made of stainless steel sheet of low thickness between 0.2mm and 0.5mm. Said envelope 14 surrounds the tubular wall 12 of the connection end piece 11 when the latter is mounted and pressed into the wall 108 of the housing 101. The envelope 14 is tubular to allow the housing of the connection end piece.

De manière préférentielle, l'enveloppe présente une paroi extérieure 15 en contact avec les gaz brulés, apte à dévier les gaz brulés dans une direction opposée à la paroi tubulaire 12. On entend par « direction opposée à la paroi tubulaire » une direction s'éloignant de la paroi tubulaire. Ladite paroi extérieure 15 peut présenter une forme sensiblement conique avec un angle de déviation α par exemple pour former sensiblement un déflecteur 16 des flux de gaz brulés.Preferably, the casing has an outer wall 15 in contact with the burnt gases, capable of deflecting the burnt gases in a direction opposite to the tubular wall 12. The term “direction opposite to the wall” is understood to mean. tubular ”a direction away from the tubular wall. Said outer wall 15 may have a substantially conical shape with a deflection angle α for example to substantially form a deflector 16 of the burnt gas flows.

De manière préférentielle, l'enveloppe 14 est séparée de la paroi tubulaire 12 de l'embout 11 de connexion. De cette façon, aucun transfert de chaleur par conduction thermique entre l'enveloppe 14 et la paroi tubulaire 12 ne peut être effectué.Preferably, the casing 14 is separated from the tubular wall 12 of the connection end piece 11. In this way, no heat transfer by thermal conduction between the casing 14 and the tubular wall 12 can be effected.

De manière préférentielle, le diamètre intérieur de l'enveloppe 14 est sensiblement égal au diamètre extérieur de l'embout de connexion 11. Ainsi aucun flux de gaz chauds ne circule entre l'enveloppe et la paroi tubulaire de l'embout.Preferably, the inside diameter of the casing 14 is substantially equal to the outside diameter of the connection end piece 11. Thus no hot gas flow circulates between the casing and the tubular wall of the end piece.

Selon le premier mode de réalisation, l'enveloppe 14 est partie du carter 101 du système de dépollution 100. Tel que représenté en figure 3, l'enveloppe 14 est sensiblement cylindrique avec une extrémité 17 tournée vers le système de dépollution légèrement étranglée et comprenant des griffes 18 de fixation. L'enveloppe 14 est facilement agrippée à l'embout de connexion 11 quand ledit embout est enfoncé dans la paroi 108 du carter 101. Les griffes de fixation 18 permettent également un positionnement optimal de l'enveloppe 14 par rapport à la paroi tubulaire 12 de l'embout de connexion pour maintenir une séparation 19 entre l'enveloppe 14 et la paroi tubulaire 12, c'est-à-dire que l'enveloppe 14 est maintenue à distance de la paroi tubulaire 12, sans contact.According to the first embodiment, the casing 14 is part of the casing 101 of the pollution control system 100. As shown in figure 3 , the casing 14 is substantially cylindrical with one end 17 turned towards the pollution control system slightly constricted and comprising claws 18 for fixing. The casing 14 is easily gripped to the connection end piece 11 when said end piece is pressed into the wall 108 of the casing 101. The fixing claws 18 also allow optimum positioning of the casing 14 relative to the tubular wall 12 of the casing. the connection end piece for maintaining a separation 19 between the casing 14 and the tubular wall 12, that is to say that the casing 14 is kept away from the tubular wall 12, without contact.

Ladite séparation 19 ou espace de séparation est remplie par une couche d'air ou de gaz formant une couche isolante entre l'enveloppe et la paroi tubulaire. L'espace de séparation peut être fermé ou de dimension adaptée pour empêcher une circulation de gaz dans ledit espace de séparation 19. Par exemple, l'épaisseur dudit espace est très faible de l'ordre du mm, ou l'accès audit espace de séparation est fermé ou recouvert par l'enveloppe 14.Said separation 19 or separation space is filled with a layer of air or gas forming an insulating layer between the casing and the tubular wall. The separation space may be closed or of suitable size to prevent gas from circulating in said separation space 19. For example, the thickness of said space is very small, of the order of one mm, or access to said space is very small. separation is closed or covered by the envelope 14.

Selon un deuxième mode de réalisation de l'invention représenté dans les figures 5 à 8, l'enveloppe 14 est partie de l'embout 11 de connexion.According to a second embodiment of the invention shown in figures 5 to 8 , the casing 14 is part of the connection end piece 11.

Selon les figures 5 et 6, l'enveloppe 14 est formée par une feuille métallique enroulée autour de la paroi tubulaire 12 de l'embout de connexion. Elle repose uniquement sur les extrémités longitudinales 17,17' de l'embout et est séparée de la paroi tubulaire 12 pour former un espace de séparation 19 entre l'enveloppe 14 et la paroi tubulaire 12 de l'embout de connexion. L'enveloppe peut être constituée par une feuille métallique cylindrique représentée en figure 6, elle est enroulée ou enfilée autour de la paroi tubulaire 12 comme représenté en figure 7. L'espace de séparation 19 entre l'enveloppe 14 et la paroi tubulaire 12 est de faible épaisseur et peut être rempli d'air ou par une couche d'isolant thermique 21 tel qu'une couche à base de fibres de verre et de résines hautes températures ou de céramique.According to figures 5 and 6 , the casing 14 is formed by a metal sheet wound around the tubular wall 12 of the connection end piece. It rests only on the longitudinal ends 17,17 'of the nozzle and is separated from the tubular wall 12 to form a separation space 19 between the casing 14 and the tubular wall 12 of the connection end piece. The envelope may be formed by a cylindrical metal sheet shown in figure 6 , it is wound or threaded around the tubular wall 12 as shown in figure 7 . The separation space 19 between the casing 14 and the tubular wall 12 is thin and can be filled with air or with a layer of thermal insulation 21 such as a layer based on glass fibers and resins. high temperatures or ceramic.

De manière préférentielle et selon la figure 8, l'enveloppe 14 peut s'étendre selon l'axe de l'embout sur une longueur plus importante que la longueur d'enfoncement 20 de l'embout 11 dans le carter 101 c'est-à-dire que l'enveloppe 14 dépasse à l'extérieur du carter 101 du système de dépollution 100 pour accroitre l'isolation thermique de l'embout de connexion et améliorer l'efficacité de l'échangeur.Preferentially and according to the figure 8 , the casing 14 can extend along the axis of the nozzle over a length greater than the length of insertion 20 of the nozzle 11 in the housing 101, that is to say that the casing 14 protrudes outside the casing 101 of the pollution control system 100 to increase the thermal insulation of the connection end piece and improve the efficiency of the exchanger.

L'objectif est atteint : l'enveloppe couvrant la portion de l'embout de connexion de l'échangeur enfoncée dans le carter permet une protection thermique dudit embout contre des flux de gaz chauds venant frapper la paroi tubulaire latérale dudit embout, ladite enveloppe étant simple à fabriquer et à mettre en place.The objective has been achieved: the casing covering the portion of the connection end piece of the exchanger pushed into the casing allows thermal protection of said end piece against hot gas flows impinging on the side tubular wall of said end piece, said envelope being easy to manufacture and install.

Dans le cadre d'une isolation thermique renforcée, on pourra augmenter l'épaisseur de la couche d'isolant disposée entre l'enveloppe et la paroi tubulaire, ce qui nécessite néanmoins d'accroitre l'ouverture du carter du système de dépollution.In the context of reinforced thermal insulation, the thickness of the insulating layer placed between the casing and the tubular wall can be increased, which nevertheless necessitates increasing the opening of the housing of the pollution control system.

Claims (9)

  1. Recirculation device (10) for waste gases from a power train of a motor vehicle comprising:
    - a casing (101) of a waste gas pollution control system (100),
    - a heat exchanger (102) between a coolant and said waste gases and having a connection end-fitting (11) with a tubular wall (12) driven through an outlet opening (107) in a conical outlet wall (108) of the casing (101) of the pollution control system, said waste gases striking said tubular wall,
    characterized in that the device (10) comprises an enclosure (14) capable of surrounding the tubular wall (12) of the connection end-fitting, to protect the tubular wall (12) from the waste gases.
  2. Recirculation device (10) according to Claim 1, characterized in that the enclosure (14) is tubular.
  3. Recirculation device (10) according to Claim 1 or 2, characterized in that the enclosure (14) is capable of deflecting the flows of waste gases to a direction opposite the tubular wall.
  4. Recirculation device (10) according to any one of Claims 1 to 3, characterized in that the enclosure (14) is formed by a metal sheet.
  5. Recirculation device (10) according to any one of Claims 1 to 4, characterized in that the enclosure (14) is separated from the tubular wall (12).
  6. Recirculation device (10) according to any one of Claims 1 to 5, characterized in that the device (10) comprises a thermal insulation layer arranged between the enclosure (14) and the tubular wall (12).
  7. Recirculation device (10) according to any one of Claims 1 to 6, characterized in that the enclosure (14) is part of the casing (101) of the pollution control system (100).
  8. Recirculation device (10) according to Claim 7, characterized in that the inner diameter of the enclosure (14) is substantially equal to the outer diameter of the connection end-fitting (11).
  9. Recirculation device (10) according to any one of Claims 1 to 6, characterized in that the enclosure (14) is part of the connection end-fitting (11).
EP18789166.8A 2017-11-15 2018-10-24 Powertrain with improved pollutant removal system Active EP3710688B1 (en)

Applications Claiming Priority (2)

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FR1760753A FR3073574A1 (en) 2017-11-15 2017-11-15 MOTOR POWERTRAIN WITH IMPROVED DEPOLLUTION SYSTEM
PCT/EP2018/079172 WO2019096553A1 (en) 2017-11-15 2018-10-24 Powertrain with improved pollutant removal system

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Publication number Priority date Publication date Assignee Title
JP2659720B2 (en) 1987-09-11 1997-09-30 三菱重工業株式会社 Exhaust heat exchanger
DE10054264A1 (en) * 2000-11-02 2002-05-08 Opel Adam Ag Intake pipe unit for feeding air into combustion chambers in a multi-cylinder internal combustion engine has an air-collection chamber, a throttle valve connection piece with an adjustable throttle valve and gas exchange valves.
JP4931390B2 (en) * 2005-09-12 2012-05-16 臼井国際産業株式会社 EGR gas cooling device
CN101832201B (en) * 2010-04-29 2012-05-02 重庆长安汽车股份有限公司 Connection structure of engine exhaust gas recirculation pipe and plastic intake manifold
FR3014947B1 (en) * 2013-12-13 2017-12-29 Renault Sas INTERNAL COMBUSTION ENGINE EXHAUST LINE AND INTERNAL COMBUSTION ENGINE COMPRISING SUCH AN EXHAUST LINE
FR3041033B1 (en) * 2015-09-15 2017-09-15 Renault Sas EXHAUST LINE AND AIR CIRCUIT FOR MOTOR VEHICLE MOTOR FOR OPTIMIZED INTEGRATION OF THE EXHAUST GAS RECIRCULATION CIRCUIT
GB2546488B (en) * 2016-01-19 2020-05-13 Ford Global Tech Llc An engine exhaust gas recirculation system with at least one exhaust recirculation treatment device
GB2559182B (en) * 2017-01-30 2021-01-06 Senior Uk Ltd Finned heat exchangers

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EP3710688A1 (en) 2020-09-23
CN111295505B (en) 2022-07-26
CN111295505A (en) 2020-06-16
FR3073574A1 (en) 2019-05-17
WO2019096553A1 (en) 2019-05-23

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