EP3388659B1 - High-pressure gas recirculation system for an internal combustion engine - Google Patents

High-pressure gas recirculation system for an internal combustion engine Download PDF

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Publication number
EP3388659B1
EP3388659B1 EP18153915.6A EP18153915A EP3388659B1 EP 3388659 B1 EP3388659 B1 EP 3388659B1 EP 18153915 A EP18153915 A EP 18153915A EP 3388659 B1 EP3388659 B1 EP 3388659B1
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EP
European Patent Office
Prior art keywords
exhaust
manifold
recirculation
duct
plenum
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EP18153915.6A
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German (de)
French (fr)
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EP3388659A1 (en
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Sylvain Dubois
Eric Dumas
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Renault SAS
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Renault SAS
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    • 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
    • F02M26/41—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories characterised by the arrangement of the recirculation passage in relation to the engine, e.g. to cylinder heads, liners, spark plugs or manifolds; characterised by the arrangement of the recirculation passage in relation to specially adapted combustion chambers
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10222—Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission

Definitions

  • the present invention relates to an internal combustion or thermal engine of a motor vehicle
  • the present invention relates more particularly to a system for recirculating the exhaust gases of a supercharged combustion engine.
  • the present invention relates to a recirculation system of high pressure burnt gases from the supercharged combustion engine.
  • the present invention relates to internal combustion engines intended in particular for equipping motor vehicles, which use means for recirculating exhaust gases.
  • the present invention relates more particularly to means for recirculating exhaust gas from an internal combustion engine.
  • the standards concerning pollution and consumption of internal combustion engines fitted to motor vehicles are becoming more stringent every day in all industrialized countries.
  • the automotive industry is therefore now busy finding technical solutions to meet these obligations, without penalizing either the performance of the engines or their cost price.
  • a known technique for depolluting internal combustion engines consists in operating the recirculation of exhaust gases at the intake in order to reduce nitrogen oxides. This technique consists in reinjecting, depending on the operating conditions of the engine, part of the exhaust gases into the combustion chambers of the engine, which has the effect of proportionally reducing the amount of oxidizing gas and therefore of lowering the combustion temperature. , hence a reduction in the production of NOx or nitrogen oxides.
  • the generally adopted process is the "external recirculation" of the exhaust gases using an RGE (Exhaust Gas Recycling) valve, also called EGR valve, closing or opening a pipe connecting the exhaust manifold. to the intake dispatcher.
  • RGE exhaust Gas Recycling
  • the EGR valve allows the injection of a determined quantity of gas taken from the exhaust according to the engine operating conditions.
  • known internal combustion engines operating with recirculation of the exhaust gases comprise a first connection pipe connecting one of the pipes of an exhaust manifold to an EGR valve disposed in the engine compartment and a second connection pipe connecting the EGR valve to the intake manifold.
  • the publication FR-A1-2721349 provides a gas recirculation system comprising an EGR gas recirculation duct hollowed out in the cylinder head and opening directly into an exhaust duct connected to a cylinder in said cylinder head, said gas recirculation duct opening out from the opposite side of a side face of the cylinder head on which an EGR valve can be fixed.
  • a drawback of this recirculation system is that the EGR gas recirculation conduit communicates with only one exhaust duct and therefore the volume of the recirculated gases is less or it is necessary to dig as many recirculation conduits in the cylinder head than exhaust pipes in the cylinder head.
  • the EGR recirculation duct opens into an exhaust duct in a non-optimal way to capture the exhaust gases, which results in a lower efficiency of the recirculation system.
  • Other exhaust gas recirculation systems are known from the documents US2013 / 0086891 A1 , US2002 / 0043254A1 and FR3000999 .
  • the aim of the present invention is to provide an internal combustion engine comprising means for recirculating exhaust gas, eliminating the drawbacks of the known prior art while promoting the simplicity of its assembly and the reduction in its size, all in an economical way.
  • the internal combustion engine according to the invention comprises a high-pressure gas recirculation system, that is to say that the system comprises a nozzle for the burnt gases upstream from exhaust gas pollution control devices such as a pot catalytic.
  • Said engine comprises on the one hand, a cylinder head in which are arranged intake and exhaust pipes coming from combustion chambers and on the other hand, exhaust gas recirculation means comprising an EGR valve, a first connecting pipe connecting the exhaust circuit to the EGR valve, and a second connecting pipe connecting the EGR valve to the intake circuit.
  • the heat engine comprises a cylinder head in which are exhausted gas pipes which are substantially orthogonal to the exhaust face of the cylinder head, each of the pipes opens from said exhaust face by a mouth.
  • the cylinder head comprises first pipes grouped along one side of the cylinder head and a side end pipe as well as a flue gas recirculation duct, each of said first pipes is separate and opens out from the exhaust face of the engine cylinder head thermal through a separate mouth which gives into a separate inlet duct in the collector.
  • the term "distinct" means the fact that a pipe is separated from another adjacent pipe by at least one wall.
  • the lateral end pipe and the recirculation duct open out from the exhaust face by the same mouth giving into the same mixed inlet duct of the manifold.
  • the exhaust manifold comprises a deflector which allows on the one hand an optimal passage of the burnt gases from the lateral end pipe in the exhaust manifold and on the other hand to bring exhaust gases to the recirculation duct, which improves the efficiency and permeability of the mixed inlet duct and the recirculation duct.
  • the deflector is arranged opposite the outlet of the mixed inlet conduit in the manifold and promotes the conduct of recirculated gases from one hand of the lateral end pipe in the manifold. exhaust and on the other hand other inlet pipes connected with the first pipes to the recirculation pipe.
  • the deflector extends a wall opposite the outlet of the mixed inlet conduit.
  • the transverse ramp and the mixed inlet duct are capable of directing the gases towards the turbine of the turbocharger in order to improve its efficiency.
  • the figure 4 is a schematic view of the manifold gas conduits.
  • passage section of a duct or an opening is understood to mean a surface of said duct or of said opening transverse to the axis of the duct or of the opening.
  • the internal combustion or internal combustion engines of a motor vehicle comprise, on the one hand, systems for reducing pollution of the burnt gases coming from combustion chambers of the engine and, on the other hand, boosting systems in order to improve the efficiency of said engines.
  • recirculation of burnt gases In order to reduce pollution, it is known to return at least a portion of the burnt gases to the engine intake, said portion is then mixed with fresh air before entering the engine cylinders.
  • the burnt gases are then taken from an exhaust manifold fixed against an exhaust face of the engine.
  • a heat engine comprises a cylinder block comprising cylinders in which a piston is movable in sliding along the axis of the piston and a cylinder head covering the upper part of the cylinder block and therefore closing the combustion chambers delimited by the cylinder walls, pistons and cylinder head.
  • Into the cylinder head are hollowed out intake and exhaust pipes. Fresh air collected outside the vehicle and then mixed with burnt gases is led to the engine cylinders via the intake ducts and by an intake manifold fixed against the intake face of the engine. Said gases are injected into the combustion chambers in the upper part of cylinders of the cylinder block and mixed with fuel to generate an explosion in said chamber generating burnt gases. The burnt gases are then pushed outside the combustion chambers via exhaust pipes to an exhaust face of the engine on the side opposite to the intake face.
  • the present invention relates to a recirculation system 100 of the high pressure burnt gases taken from the exhaust manifold 20 to be returned to the intake face on the opposite side of the engine.
  • the flow of said recirculated gases is controlled by an EGR valve for "Exhaust Gas Recirculation" in English.
  • the thermal engine of a motor vehicle comprises a cylinder head 50 in which are hollowed the exhaust pipes 51 connected with the combustion chambers (not shown) of the engine. Said pipes 51 open out substantially orthogonal to the exhaust face 52 of the cylinder head, the outlets of said pipes are aligned along the longitudinal axis X of the cylinder head.
  • the invention provides first exhaust pipes 53 arranged on the side of the accessory face 58 of the cylinder head and emerging from the exhaust face of said cylinder head by first substantially identical mouths 54, oblong and aligned along the longitudinal axis X and a exhaust pipe 55 at the end on the side of a coupling face 59 of the cylinder head and a recirculation duct 56 hollowed out in the cylinder head.
  • the recirculation duct has a first end 57 opening from the face of the cylinder head and a second end 57 ′ emerging from the coupling face 59 substantially orthogonal to the exhaust face 52 of the cylinder head 50.
  • the recirculation duct 56 and the adjacent end pipe emerge from the exhaust face 52 by the same end mouth 60 which has an oblong opening whose section is substantially double the sections of the first mouths 54.
  • the manifold 20 gas is fixed by a contact face 52 'against the exhaust face 52 of the cylinder head and has inlet conduits 21,22 opening from said contact face by first and end inlet ports 54' , 60 ′, the gas passage passage sections of which are substantially equal respectively to the sections of the first mouths 54 and of the end mouth 60 as shown in Figures 1 to 3 , said figures make it possible to appreciate the sections of the first mouths and of the end mouth.
  • the figures 2 and 4 in reverse represent cavities dug in the collector 20, the collector surrounding the volumes 13 of said cavities shown. Said manifold 20 is fixed against the exhaust face 52 of the cylinder head.
  • the manifold 20 comprises first gas inlet pipes 21 which are connected to the first pipes 53 and a so-called mixed inlet pipe 22 connected to the lateral end pipe 55 with the recirculation pipe 56.
  • the inlet pipe 22 is said to be mixed because it can be the seat of gas flow in two opposite directions.
  • the inlet sections of the first inlet conduits 21 are at least equal to the sections of the openings of the first mouths 54 and the same is true for the section of the mixed inlet conduit 22 connected with the end mouth 60 through which open the end pipe with the recirculation duct.
  • the first inlet conduits 21 have a substantially constant gas passage section 23 and open into a transverse ramp 24 extending substantially parallel to the longitudinal axis X of the engine.
  • the cross section of the gases in the transverse ramp 24 is constant over the entire length of said ramp. Said transverse ramp 24 is thus connected with each of the first inlet conduits 21 and has one end directed towards a plenum 25 and more precisely towards an access chamber 28 to a turbine 27 of a turbocharger.
  • the mixed inlet duct 22 is hollowed out in the manifold along an axis directed towards the plenum 25 to direct burnt gases towards said plenum and particularly towards access chamber 28 to the turbocharger turbine.
  • the passage section 23 ′ of the mixed inlet duct is preferably reduced continuously to present a passage section facing the plenum substantially equal to the passage section of the transverse ramp 24.
  • the cross section of the gases in the transverse ramp 24 is between 600 and 750 mm2 and the cross section of the mixed inlet duct decreases from 1,500 to 750 mm2 from the upstream end opposite the breech to the downstream end giving into the plenum 25.
  • the collector comprises a deflector 26 extending from a wall of the collector opposite with the outlet 22 av of the mixed inlet conduit 22 in the plenum 25.
  • the deflector 26 is formed by a boss from the wall of the collector opposite the mixed inlet conduit 22. The cross-section of the flue gases from the lateral end pipe 55 is therefore reduced by the deflector 26 in the mixed inlet duct 22 from the inlet mouth 60 'of the mixed inlet duct to the plenum 25.
  • the burnt gases are expelled from the combustion chambers according to a combustion cycle, that is to say that the burnt gases do not fill all the exhaust pipes 51, 53, 55 at the same time.
  • substantially constant value of the passage sections of the first inlet conduits 21 and of the transverse ramp 24 allows a lesser pressure drop in the flow of gases from the cylinder head until reaching the plenum 25 in the manifold 20.
  • Said plenum 25 allows the junction between the ramp transverse 24 and the mixed inlet duct 22. The burnt gases coming from the transverse ramp can thus pass to the mixed inlet duct 22 along the deflector 26 then to the recirculation duct 56 when the valve opens EGR.
  • the burnt gases from the lateral end pipe 55 are directed towards the plenum 25 and more particularly towards the access chamber 28 towards the turbine 27. At the outlet of the exhaust face, said gases are directed into the conduit d 'mixed inlet 22 whose passage section at this location is much larger than the passage section of the lateral end pipe 55, which increases the pressure losses.
  • the deflector 26 promotes this flow of gases by appreciably reducing the passage section in the mixed inlet duct 22.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Description

Domaine technique de l'inventionTechnical field of the invention

La présente invention concerne un moteur à combustion interne ou thermique d'un véhicule automobileThe present invention relates to an internal combustion or thermal engine of a motor vehicle

La présente invention concerne plus particulièrement un système de recirculation des gaz d'échappement d'un moteur thermique suralimenté.The present invention relates more particularly to a system for recirculating the exhaust gases of a supercharged combustion engine.

La présente invention concerne un système de recirculation des gaz brulés haute pression du moteur thermique suralimenté.The present invention relates to a recirculation system of high pressure burnt gases from the supercharged combustion engine.

Etat de la techniqueState of the art

La présente invention concerne les moteurs à combustion interne destinés notamment à équiper les véhicules automobiles, qui mettent en œuvre des moyens de recirculation de gaz d'échappement.The present invention relates to internal combustion engines intended in particular for equipping motor vehicles, which use means for recirculating exhaust gases.

La présente invention concerne plus particulièrement des moyens de recirculation de gaz d'échappement d'un moteur à combustion interne. Les normes concernant la pollution et la consommation des moteurs à combustion interne équipant les véhicules automobiles, deviennent chaque jour plus sévères dans l'ensemble des pays industrialisés. L'industrie automobile est donc aujourd'hui occupée à trouver des solutions techniques pour répondre à ces obligations et ce, sans trop pénaliser ni les performances des moteurs ni leur prix de revient. Une technique connue de dépollution des moteurs à combustion interne consiste à opérer la recirculation de gaz d'échappement à l'admission afin de diminuer les oxydes d'azote. Cette technique consiste à réinjecter suivant les conditions de fonctionnement du moteur une partie des gaz d'échappement dans les chambres de combustion du moteur, ce qui a pour effet de réduire en proportion la quantité de gaz comburant et donc d'abaisser la température de combustion, d'où une diminution de la production des NOx ou d'oxydes d'azote.The present invention relates more particularly to means for recirculating exhaust gas from an internal combustion engine. The standards concerning pollution and consumption of internal combustion engines fitted to motor vehicles are becoming more stringent every day in all industrialized countries. The automotive industry is therefore now busy finding technical solutions to meet these obligations, without penalizing either the performance of the engines or their cost price. A known technique for depolluting internal combustion engines consists in operating the recirculation of exhaust gases at the intake in order to reduce nitrogen oxides. This technique consists in reinjecting, depending on the operating conditions of the engine, part of the exhaust gases into the combustion chambers of the engine, which has the effect of proportionally reducing the amount of oxidizing gas and therefore of lowering the combustion temperature. , hence a reduction in the production of NOx or nitrogen oxides.

Le procédé généralement adopté est la "recirculation externe" des gaz d'échappement à l'aide d'une soupape pilotée RGE (Recyclage des Gaz d'Echappement), encore appelée vanne EGR, fermant ou ouvrant une canalisation reliant le collecteur d'échappement au répartiteur d'admission. La vanne EGR permet d'injecter à l'admission une quantité déterminée de gaz prélevés à l'échappement suivant les conditions de fonctionnement du moteur.The generally adopted process is the "external recirculation" of the exhaust gases using an RGE (Exhaust Gas Recycling) valve, also called EGR valve, closing or opening a pipe connecting the exhaust manifold. to the intake dispatcher. The EGR valve allows the injection of a determined quantity of gas taken from the exhaust according to the engine operating conditions.

De manière connue, comme cela est notamment décrit dans les demandes de brevet n° FR-2.372.319 ou FR-78/33196 , les moteurs à combustion interne connus fonctionnant avec une recirculation des gaz d'échappement comportent une première conduite de liaison reliant l'une des tubulures d'un collecteur d'échappement à une vanne EGR disposée dans le compartiment moteur et une seconde conduite de liaison reliant la vanne EGR au collecteur d'admission.In a known manner, as is notably described in the requests for patent n ° FR-2.372.319 or FR-78/33196 , known internal combustion engines operating with recirculation of the exhaust gases comprise a first connection pipe connecting one of the pipes of an exhaust manifold to an EGR valve disposed in the engine compartment and a second connection pipe connecting the EGR valve to the intake manifold.

Pour simplifier la mise en place d'une telle recirculation des gaz d'échappement, il est également connu de faire un piquage des gaz brulés soit, directement sur la tubulure d'échappement comme cela divulgué dans la publication FR-A1-2689936 soit encore, directement sur le collecteur d'échappement comme cela est décrit dans une autre publication FR-A1-2390590 . Ces dispositions permettent en effet de supprimer l'une ou l'autre des conduites de liaisons, ce qui réduit sensiblement le temps de montage d'une vanne EGR.To simplify the installation of such an exhaust gas recirculation, it is also known to make a nozzle for the burnt gases either directly on the exhaust manifold as disclosed in the publication FR-A1-2689936 either again, directly on the exhaust manifold as described in another publication FR-A1-2390590 . These provisions make it possible to remove one or the other of the connecting pipes, which significantly reduces the time required to assemble an EGR valve.

La mise en place de la vanne EGR sur le collecteur d'admission ou sur le collecteur d'échappement, généralement fixés par une de leurs extrémités sur l'une des parois latérales de la culasse du moteur, a pour inconvénient d'alourdir et donc d'accroître le porte-à-faux de ces pièces, ce qui provoque une augmentation des vibrations dans ces dernières et donc la bruyance du moteur.The establishment of the EGR valve on the intake manifold or on the exhaust manifold, generally fixed by one of their ends on one of the side walls of the cylinder head of the engine, has the disadvantage of weighing down and therefore increase the overhang of these parts, which causes an increase in vibrations in the latter and therefore the engine noise.

La publication FR-A1-2721349 propose un système de recirculation des gaz comprenant un conduit de recirculation de gaz EGR creusé dans la culasse et débouchant directement dans un conduit d'échappement connecté à un cylindre dans ladite culasse, ledit conduit de recirculation de gaz débouchant du côté opposé d'une face latérale de la culasse sur laquelle peut être fixée une vanne EGR.The publication FR-A1-2721349 provides a gas recirculation system comprising an EGR gas recirculation duct hollowed out in the cylinder head and opening directly into an exhaust duct connected to a cylinder in said cylinder head, said gas recirculation duct opening out from the opposite side of a side face of the cylinder head on which an EGR valve can be fixed.

Un inconvénient de ce système de recirculation est que le conduit de recirculation des gaz EGR ne communique qu'avec un seul conduit d'échappement et donc le volume des gaz recirculés est moindre ou il est nécessaire de creuser autant de conduits de recirculation dans la culasse que de conduits d'échappement dans la culasse. De plus, le conduit de recirculation EGR débouche dans un conduit d'échappement de manière non optimale pour capter les gaz d'échappement ce qui entraine une moindre efficacité du système de recirculation. D'autres systèmes de recirculation des gaz d'échappement sont connus des documents US2013/0086891 A1 , US2002/0043254A1 et FR3000999 .A drawback of this recirculation system is that the EGR gas recirculation conduit communicates with only one exhaust duct and therefore the volume of the recirculated gases is less or it is necessary to dig as many recirculation conduits in the cylinder head than exhaust pipes in the cylinder head. In addition, the EGR recirculation duct opens into an exhaust duct in a non-optimal way to capture the exhaust gases, which results in a lower efficiency of the recirculation system. Other exhaust gas recirculation systems are known from the documents US2013 / 0086891 A1 , US2002 / 0043254A1 and FR3000999 .

Le but de la présente invention est de proposer un moteur à combustion interne comportant des moyens de recirculation de gaz d'échappement, en supprimant les inconvénients de l'art antérieur connu tout en favorisant la simplicité de son montage et la diminution de son encombrement , le tout de façon économique.The aim of the present invention is to provide an internal combustion engine comprising means for recirculating exhaust gas, eliminating the drawbacks of the known prior art while promoting the simplicity of its assembly and the reduction in its size, all in an economical way.

Le moteur à combustion interne selon l'invention comporte un système de recirculation de gaz haute pression c'est-à-dire que le système comporte un piquage des gaz brulés en amont de dispositifs de dépollution des gaz d'échappement tels qu'un pot catalytique. Ledit moteur comprend d'une part, une culasse dans laquelle sont agencées des canalisations d'admission et d'échappement issues de chambres de combustion et d'autre part, des moyens de recirculation des gaz d'échappement comprenant une vanne EGR, une première canalisation de liaison reliant le circuit d'échappement à la vanne EGR, et une seconde canalisation de liaison reliant la vanne EGR au circuit d'admission.The internal combustion engine according to the invention comprises a high-pressure gas recirculation system, that is to say that the system comprises a nozzle for the burnt gases upstream from exhaust gas pollution control devices such as a pot catalytic. Said engine comprises on the one hand, a cylinder head in which are arranged intake and exhaust pipes coming from combustion chambers and on the other hand, exhaust gas recirculation means comprising an EGR valve, a first connecting pipe connecting the exhaust circuit to the EGR valve, and a second connecting pipe connecting the EGR valve to the intake circuit.

Présentation de l'inventionPresentation of the invention

La présente invention concerne plus particulièrement un système de recirculation des gaz d'échappement d'un moteur thermique comprenant une culasse dont laquelle sont creusés :

  • des premières canalisations d'échappement,
  • une canalisation d'échappement d'extrémité latérale, toutes les canalisations étant connectées avec des chambres à combustion,
  • et un conduit de recirculation de gaz d'échappement adjacent à la canalisation d'extrémité,
chacune des canalisations débouchant par une bouche distincte d'une face d'échappement de culasse dans un collecteur d'échappement, et donnant dans un conduit d'entrée distinct du collecteur connecté avec un plénum du collecteur,
caractérisé en ce que le conduit de recirculation et la canalisation d'extrémité adjacente débouchent de la face d'échappement par une même bouche dans un même conduit d'entrée mixte du collecteur d'échappement en amont du débouché dans le plénum d'admission.The present invention relates more particularly to a system for recirculating the exhaust gases of a heat engine comprising a cylinder head from which are hollowed out:
  • the first exhaust pipes,
  • a side end exhaust pipe, all the pipes being connected with combustion chambers,
  • and an exhaust gas recirculation duct adjacent to the end pipe,
each of the pipes opening out through a mouth separate from a cylinder head exhaust face into an exhaust manifold, and giving into an inlet duct separate from the manifold connected with a plenum of the manifold,
characterized in that the recirculation duct and the adjacent end pipe open from the exhaust face by the same mouth in the same mixed inlet duct of the exhaust manifold upstream of the outlet in the intake plenum.

De manière avantageuse, le moteur thermique comporte une culasse dans laquelle sont creusées des canalisations de gaz d'échappement qui sont sensiblement orthogonales à la face d'échappement de la culasse, chacune des canalisations débouche de ladite face d'échappement par une bouche. La culasse comprend des premières canalisations regroupées selon un côté de la culasse et une canalisation d'extrémité latérale ainsi qu'un conduit de recirculation des gaz brulés, chacune desdites premières canalisations est distincte et débouche de la face d'échappement de la culasse du moteur thermique par une bouche distincte qui donne dans un conduit d'entrée distinct dans le collecteur. On entend par le terme « distinct » le fait qu'une canalisation est séparée d'une autre canalisation adjacente par au moins une paroi. La canalisation d'extrémité latérale et le conduit de recirculation débouchent de la face d'échappement par une même bouche donnant dans un même conduit d'entrée mixte du collecteur. Ainsi les gaz brulés issus des différentes canalisations premières et d'extrémité sont susceptibles d'être captés et dirigés dans le conduit de recirculation dont l'encombrement est réduit car il est creusé dans la culasse.Advantageously, the heat engine comprises a cylinder head in which are exhausted gas pipes which are substantially orthogonal to the exhaust face of the cylinder head, each of the pipes opens from said exhaust face by a mouth. The cylinder head comprises first pipes grouped along one side of the cylinder head and a side end pipe as well as a flue gas recirculation duct, each of said first pipes is separate and opens out from the exhaust face of the engine cylinder head thermal through a separate mouth which gives into a separate inlet duct in the collector. The term "distinct" means the fact that a pipe is separated from another adjacent pipe by at least one wall. The lateral end pipe and the recirculation duct open out from the exhaust face by the same mouth giving into the same mixed inlet duct of the manifold. Thus the burnt gases from the various first and end pipes are capable of being captured and directed into the recirculation duct, the size of which is reduced since it is hollowed out in the cylinder head.

Selon un exemple:

  • * le collecteur comporte un déflecteur apte :
    • à diriger les gaz d'échappement dans le conduit d'entrée mixte depuis une bouche d'entrée vers le plénum,
    • et à ramener des gaz d'échappement vers le conduit de recirculation.
According to an example:
  • * the collector includes a deflector suitable for:
    • directing the exhaust gases into the mixed inlet duct from an inlet mouth to the plenum,
    • and to return exhaust gases to the recirculation duct.

De manière avantageuse, le collecteur d'échappement comporte un déflecteur qui permet d'une part un passage optimal des gaz brulés depuis la canalisation d'extrémité latérale dans le collecteur d'échappement et d'autre part de ramener des gaz d'échappement vers le conduit de recirculation, ce qui améliore l'efficacité et la perméabilité du conduit d'entrée mixte et du conduit de recirculation.Advantageously, the exhaust manifold comprises a deflector which allows on the one hand an optimal passage of the burnt gases from the lateral end pipe in the exhaust manifold and on the other hand to bring exhaust gases to the recirculation duct, which improves the efficiency and permeability of the mixed inlet duct and the recirculation duct.

Selon l'invention, le déflecteur est agencé en vis-à-vis du débouché du conduit d'entrée mixte dans le collecteur et favorise la conduite des gaz recirculés issus d'une part de la canalisation d'extrémité latérale dans le collecteur d'échappement et d'autre part des autres conduits d'entrée connectés avec les premières canalisations vers le conduit de recirculation.According to the invention, the deflector is arranged opposite the outlet of the mixed inlet conduit in the manifold and promotes the conduct of recirculated gases from one hand of the lateral end pipe in the manifold. exhaust and on the other hand other inlet pipes connected with the first pipes to the recirculation pipe.

Selon d'autres caractéristiques de l'invention, * le déflecteur prolonge une paroi en vis-à-vis du débouché du conduit d'entrée mixte.According to other characteristics of the invention, * the deflector extends a wall opposite the outlet of the mixed inlet conduit.

De manière avantageuse, le déflecteur prolonge une partie de la paroi du collecteur en vis-à-vis avec le débouché du conduit d'entrée mixte ; il peut par exemple être formé par un bossage depuis cette paroi ce qui est simple et économique.

  • le conduit d'entrée mixte du collecteur présente une section de passage des gaz se réduisant depuis une partie amont connectée avec la bouche de débouché du conduit de recirculation et de la canalisation d'extrémité adjacente vers une partie aval connectée avec le plénum du collecteur.
Advantageously, the deflector extends a part of the wall of the collector opposite with the outlet of the mixed inlet conduit; it can for example be formed by a boss from this wall which is simple and economical.
  • the mixed inlet manifold conduit has a reducing gas passage section from an upstream part connected with the outlet mouth of the recirculation conduit and the adjacent end pipe to a downstream part connected with the plenum of the manifold.

De manière avantageuse, le conduit d'entrée mixte présente une section de passage des gaz se réduisant depuis une partie amont en vis-à-vis avec la culasse vers une partie aval connectée avec le plénum, ladite réduction permet d'une part une meilleure conduite des gaz vers le plénum et d'autre part de mieux capter des gaz en direction du conduit de recirculation.

  • les conduits d'entrée connectés aux premières canalisations sont raccordés à une rampe transversale de section de passage constante et égale à la section de passage desdits conduits d'entrée, débouchant dans le plenum.
Advantageously, the mixed inlet duct has a gas passage section reducing from an upstream part opposite the cylinder head to a downstream part connected with the plenum, said reduction allows on the one hand, a better gas line to the plenum and, on the other hand, better gas capture in the direction of the recirculation duct.
  • the inlet conduits connected to the first pipes are connected to a transverse ramp with a constant passage section equal to the passage section of said inlet conduits, opening into the plenum.

De manière avantageuse, le passage des gaz depuis la culasse jusqu'au plenum du collecteur est fait à section de passage constante analogue à une traversée d'un tube cylindrique pour minimiser les pertes de charge.

  • le conduit de recirculation comporte une extrémité opposée débouchant d'une face latérale de la culasse.
Advantageously, the passage of gases from the cylinder head to the plenum of the manifold is made with a constant passage section similar to a passage through a cylindrical tube to minimize pressure losses.
  • the recirculation duct has an opposite end opening out from a lateral face of the cylinder head.

De manière avantageuse, le conduit de recirculation comporte une première extrémité débouchant de la face d'échappement et une seconde extrémité d'une face latérale sensiblement orthogonale à la face d'échappement et contre laquelle une vanne EGR pourra être fixée, ce qui réduit l'encombrement du système de recirculation.

  • le plenum comporte une chambre d'accès vers une turbine.
Advantageously, the recirculation duct has a first end opening out of the exhaust face and a second end of a lateral face substantially orthogonal to the exhaust face and against which an EGR valve can be fixed, which reduces the size of the recirculation system.
  • the plenum has an access chamber to a turbine.

De manière avantageuse, le plénum du collecteur comporte une chambre d'accès vers une turbine notamment d'un turbocompresseur, ce qui permet de réduire l'encombrement général du moteur et d'améliorer l'efficacité des composants du moteur dont le turbocompresseur.

  • la rampe transversale et le conduit d'entrée mixte comportent un axe dirigé vers la chambre d'accès vers la turbine.
Advantageously, the plenum of the manifold includes an access chamber to a turbine, in particular a turbocharger, which makes it possible to reduce the overall size of the engine and to improve the efficiency of the engine components including the turbocharger.
  • the transverse ramp and the mixed inlet duct have an axis directed towards the access chamber towards the turbine.

De manière avantageuse, la rampe transversale et le conduit d'entrée mixte sont apte à diriger les gaz vers la turbine du turbocompresseur afin d'améliorer son efficacité.Advantageously, the transverse ramp and the mixed inlet duct are capable of directing the gases towards the turbine of the turbocharger in order to improve its efficiency.

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'ensemble d'un système de turbocollecteur
  • la figure 2 est une vue schématique de coupe de la culasse et du collecteur d'échappement.
  • la figure 3 est une vue schématique de la bride d'interface du collecteur.
Other characteristics and advantages of the invention will appear on reading the following description of particular embodiments of the invention given by way of nonlimiting examples and represented in the appended drawings, in which:
  • the figure 1 is a schematic overview of a turbocharger system
  • the figure 2 is a schematic sectional view of the cylinder head and the exhaust manifold.
  • the figure 3 is a schematic view of the manifold interface flange.

La figure 4 est une vue schématique des conduits de gaz du collecteur.The figure 4 is a schematic view of the manifold gas conduits.

Description détaillée des figuresDetailed description of the figures

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

On entend dans ce document par les termes « section de passage » d'un conduit ou d'une ouverture une surface dudit conduit ou de la dite ouverture transversale à l'axe du conduit ou de l'ouverture.In this document, the term “passage section” of a duct or an opening is understood to mean a surface of said duct or of said opening transverse to the axis of the duct or of the opening.

Les moteurs thermiques ou à combustion interne de véhicule automobile comportent d'une part des systèmes en vue de réduire la pollution des gaz brulés issus de chambres à combustion du moteur et d'autre part des systèmes de suralimentation afin d'améliorer l'efficacité desdits moteurs.The internal combustion or internal combustion engines of a motor vehicle comprise, on the one hand, systems for reducing pollution of the burnt gases coming from combustion chambers of the engine and, on the other hand, boosting systems in order to improve the efficiency of said engines.

Dans le but de réduire la pollution, il est connu de renvoyer au moins une part des gaz brulés vers l'admission du moteur, ladite partie est alors mélangée avec de l'air frais avant son entrée dans les cylindres du moteur. On distingue deux types de recirculation de gaz brulés : d'une part une recirculation en basse pression qui comporte un prélèvement de gaz brulés en aval selon le sens d'écoulement des gaz de dispositifs de dépollution tels qu'un pot catalytique, d'autre part une recirculation en haute pression où les gaz brulés sont captés en amont des dispositifs de dépollution et de manière préférentielle en sortie d'une culasse du moteur. Les gaz brulés sont alors prélevés au niveau d'un collecteur d'échappement fixé contre une face d'échappement du moteur.In order to reduce pollution, it is known to return at least a portion of the burnt gases to the engine intake, said portion is then mixed with fresh air before entering the engine cylinders. There are two types of recirculation of burnt gases: on the one hand, recirculation at low pressure which includes a sampling of burnt gases downstream according to the direction of flow of the gases from pollution control devices such as a catalytic converter, share a high pressure recirculation where the burnt gases are captured upstream of the pollution control devices and preferably at the outlet of an engine cylinder head. The burnt gases are then taken from an exhaust manifold fixed against an exhaust face of the engine.

De manière générale, un moteur thermique comporte un carter-cylindres comprenant des cylindres dans lesquels un piston est mobile en coulissement selon l'axe du piston et une culasse recouvrant la partie supérieure du carter-cylindres et donc fermant des chambres à combustion délimitées par les parois des cylindres, les pistons et la culasse. Dans la culasse sont creusés des conduits d'admission et des canalisations d'échappement. De l'air frais capté à l'extérieur du véhicule et mélangé ensuite avec des gaz brulés est conduit vers les cylindres du moteur via les conduits d'admission et par un répartiteur d'admission fixé contre la face d'admission du moteur. Lesdits gaz sont injectés dans les chambres à combustion en partie haute de cylindres du carter cylindres et mélangés avec du carburant pour engendrer une explosion dans ladite chambre générant des gaz brulés. Les gaz brulés sont alors poussés en dehors des chambres à combustion via des canalisations d'échappement vers une face d'échappement du moteur du côté opposé à la face d'admission.In general, a heat engine comprises a cylinder block comprising cylinders in which a piston is movable in sliding along the axis of the piston and a cylinder head covering the upper part of the cylinder block and therefore closing the combustion chambers delimited by the cylinder walls, pistons and cylinder head. Into the cylinder head are hollowed out intake and exhaust pipes. Fresh air collected outside the vehicle and then mixed with burnt gases is led to the engine cylinders via the intake ducts and by an intake manifold fixed against the intake face of the engine. Said gases are injected into the combustion chambers in the upper part of cylinders of the cylinder block and mixed with fuel to generate an explosion in said chamber generating burnt gases. The burnt gases are then pushed outside the combustion chambers via exhaust pipes to an exhaust face of the engine on the side opposite to the intake face.

La présente invention concerne un système de recirculation 100 des gaz brulés haute pression prélevés au niveau du collecteur d'échappement 20 pour être renvoyés vers la face d'admission du côté opposé du moteur. L'écoulement desdits gaz recirculés est contrôlé par une vanne EGR pour « Exhaust Gaz Recirculation» en anglais.The present invention relates to a recirculation system 100 of the high pressure burnt gases taken from the exhaust manifold 20 to be returned to the intake face on the opposite side of the engine. The flow of said recirculated gases is controlled by an EGR valve for "Exhaust Gas Recirculation" in English.

Tel que présenté en figure 2, le moteur thermique de véhicule automobile comporte une culasse 50 dans laquelle sont creusées les canalisations d'échappement 51 connectées avec les chambres à combustion (non représentés) du moteur. Lesdites canalisations 51 débouchent de façon sensiblement orthogonale à la face d'échappement 52 de la culasse, les débouchés desdites canalisations sont alignés selon l'axe longitudinal X de la culasse. L'invention propose des premières canalisations d'échappement 53 disposées du côté de la face accessoires 58 de la culasse et débouchant de la face échappement de ladite culasse par des premières bouches 54 sensiblement identiques, oblongues et alignées selon l'axe longitudinal X et une canalisation d'échappement 55 d'extrémité du côté d'une face d'accouplement 59 de la culasse et un conduit de recirculation 56 creusés dans la culasse. Le conduit de recirculation comporte une première extrémité 57 débouchant de la face d'échappement de la culasse et une seconde extrémité 57' débouchant de la face d'accouplement 59 sensiblement orthogonale à la face d'échappement 52 de la culasse 50. Selon la figure 2, le conduit de recirculation 56 et la canalisation d'extrémité adjacente débouchent de la face d'échappement 52 par une même bouche d'extrémité 60 qui présente une ouverture oblongue dont la section est sensiblement double des sections des premières bouches 54. Le collecteur 20 de gaz est fixé par une face de contact 52' contre la face d'échappement 52 de la culasse et comporte des conduits d'entrée 21,22 débouchant de ladite face de contact par des bouches d'entrée premières et d'extrémité 54', 60' dont les sections de passage de passage des gaz sont sensiblement égales respectivement aux sections des premières bouches 54 et de la bouche d'extrémité 60 tel que représenté en figures 1 à 3, lesdites figures permettent d'apprécier les sections des premières bouches et de la bouche d'extrémité.As presented in figure 2 , the thermal engine of a motor vehicle comprises a cylinder head 50 in which are hollowed the exhaust pipes 51 connected with the combustion chambers (not shown) of the engine. Said pipes 51 open out substantially orthogonal to the exhaust face 52 of the cylinder head, the outlets of said pipes are aligned along the longitudinal axis X of the cylinder head. The invention provides first exhaust pipes 53 arranged on the side of the accessory face 58 of the cylinder head and emerging from the exhaust face of said cylinder head by first substantially identical mouths 54, oblong and aligned along the longitudinal axis X and a exhaust pipe 55 at the end on the side of a coupling face 59 of the cylinder head and a recirculation duct 56 hollowed out in the cylinder head. The recirculation duct has a first end 57 opening from the face of the cylinder head and a second end 57 ′ emerging from the coupling face 59 substantially orthogonal to the exhaust face 52 of the cylinder head 50. According to the figure 2 , the recirculation duct 56 and the adjacent end pipe emerge from the exhaust face 52 by the same end mouth 60 which has an oblong opening whose section is substantially double the sections of the first mouths 54. The manifold 20 gas is fixed by a contact face 52 'against the exhaust face 52 of the cylinder head and has inlet conduits 21,22 opening from said contact face by first and end inlet ports 54' , 60 ′, the gas passage passage sections of which are substantially equal respectively to the sections of the first mouths 54 and of the end mouth 60 as shown in Figures 1 to 3 , said figures make it possible to appreciate the sections of the first mouths and of the end mouth.

Les figures 2 et 4 représentent en inversé des cavités creusées dans le collecteur 20, le collecteur entourant les volumes 13 desdites cavités représentés. Ledit collecteur 20 est fixé contre la face d'échappement 52 de la culasse.The figures 2 and 4 in reverse represent cavities dug in the collector 20, the collector surrounding the volumes 13 of said cavities shown. Said manifold 20 is fixed against the exhaust face 52 of the cylinder head.

Le collecteur 20 comprend des premiers conduits d'entrée des gaz 21 qui sont connectés aux premières canalisations 53 et un conduit d'entrée dit mixte 22 connecté à la canalisation d'extrémité 55 latérale avec le conduit de recirculation 56. Le conduit d'entrée 22 est dit mixte car il peut être le siège de flux de gaz dans deux sens opposé. Les sections d'entrée des premiers conduits d'entrée 21 sont au moins égales aux sections des ouvertures des premières bouches 54 et il en est de même pour la section du conduit d'entrée mixte 22 connecté avec la bouche d'extrémité 60 par laquelle débouchent la canalisation d'extrémité avec le conduit de recirculation.The manifold 20 comprises first gas inlet pipes 21 which are connected to the first pipes 53 and a so-called mixed inlet pipe 22 connected to the lateral end pipe 55 with the recirculation pipe 56. The inlet pipe 22 is said to be mixed because it can be the seat of gas flow in two opposite directions. The inlet sections of the first inlet conduits 21 are at least equal to the sections of the openings of the first mouths 54 and the same is true for the section of the mixed inlet conduit 22 connected with the end mouth 60 through which open the end pipe with the recirculation duct.

Tel que représenté en figure 4, les premiers conduits d'entrée 21 présentent une section de passage 23 des gaz sensiblement constante et débouchent dans une rampe transversale 24 s'étendant sensiblement parallèlement à l'axe longitudinal X du moteur. De manière préférentielle, la section de passage des gaz dans la rampe transversale 24 est constante sur toute la longueur de ladite rampe. Ladite rampe transversale 24 est ainsi connectée avec chacun des premiers conduits d'entrée 21 et présente une extrémité dirigée vers un plénum 25 et plus précisément vers une chambre d'accès 28 à une turbine 27 de turbocompresseur.As shown in figure 4 , the first inlet conduits 21 have a substantially constant gas passage section 23 and open into a transverse ramp 24 extending substantially parallel to the longitudinal axis X of the engine. Preferably, the cross section of the gases in the transverse ramp 24 is constant over the entire length of said ramp. Said transverse ramp 24 is thus connected with each of the first inlet conduits 21 and has one end directed towards a plenum 25 and more precisely towards an access chamber 28 to a turbine 27 of a turbocharger.

Le conduit d'entrée mixte 22 est creusé dans le collecteur selon un axe dirigé vers le plenum 25 pour diriger des gaz brulés vers ledit plenum et particulièrement vers chambre d'accès 28 à la turbine de turbocompresseur. La section de passage 23' du conduit d'entrée mixte est réduite de manière préférentielle de manière continue pour présenter une section de passage en regard avec le plenum sensiblement égale à la section de passage de la rampe transversale 24.The mixed inlet duct 22 is hollowed out in the manifold along an axis directed towards the plenum 25 to direct burnt gases towards said plenum and particularly towards access chamber 28 to the turbocharger turbine. The passage section 23 ′ of the mixed inlet duct is preferably reduced continuously to present a passage section facing the plenum substantially equal to the passage section of the transverse ramp 24.

Selon un mode de réalisation, la section de passage des gaz dans le rampe transversale 24 est comprise entre 600 et 750 mm2 et la section de passage du conduit d'entrée mixte diminue de 1500 à 750 mm2 depuis l'extrémité amont en regard avec la culasse jusqu'à l'extrémité aval donnant dans le plénum 25.According to one embodiment, the cross section of the gases in the transverse ramp 24 is between 600 and 750 mm2 and the cross section of the mixed inlet duct decreases from 1,500 to 750 mm2 from the upstream end opposite the breech to the downstream end giving into the plenum 25.

Selon un mode de réalisation de l'invention, le collecteur comporte un déflecteur 26 s'étendant depuis une paroi du collecteur en vis-à-vis avec le débouché 22av du conduit d'entrée mixte 22 dans le plénum 25. Selon la figure 2, le déflecteur 26 est formé par un bossage depuis la paroi du collecteur en regard avec le conduit d'entrée mixte 22. La section de passage des gaz brulés issus de la canalisation d'extrémité latérale 55 est donc réduite par le déflecteur 26 dans le conduit d'entrée mixte 22 depuis la bouche d'entrée 60' du conduit d'entrée mixte jusqu'au plénum 25.According to one embodiment of the invention, the collector comprises a deflector 26 extending from a wall of the collector opposite with the outlet 22 av of the mixed inlet conduit 22 in the plenum 25. According to the figure 2 , the deflector 26 is formed by a boss from the wall of the collector opposite the mixed inlet conduit 22. The cross-section of the flue gases from the lateral end pipe 55 is therefore reduced by the deflector 26 in the mixed inlet duct 22 from the inlet mouth 60 'of the mixed inlet duct to the plenum 25.

Lors du fonctionnement du moteur, les gaz brulés sont expulsés des chambres de combustion selon un cycle de combustion c'est-à-dire que les gaz brulés ne remplissent pas toutes les canalisations d'échappement 51,53, 55 à la fois, la valeur sensiblement constante des sections de passage des premiers conduits d'entrée 21 et de la rampe transversale 24 permet une moindre perte de charge de l'écoulement des gaz depuis la culasse jusqu'à l'atteinte du plénum 25 dans le collecteur 20. Ledit plénum 25 permet la jonction entre la rampe transversale 24 et le conduit d'entrée mixte 22. Les gaz brulés issus de la rampe transversale peuvent ainsi passer vers le conduit d'entrée mixte 22 en longeant le déflecteur 26 puis vers le conduit de recirculation 56 lors de l'ouverture de la vanne EGR.During the operation of the engine, the burnt gases are expelled from the combustion chambers according to a combustion cycle, that is to say that the burnt gases do not fill all the exhaust pipes 51, 53, 55 at the same time. substantially constant value of the passage sections of the first inlet conduits 21 and of the transverse ramp 24 allows a lesser pressure drop in the flow of gases from the cylinder head until reaching the plenum 25 in the manifold 20. Said plenum 25 allows the junction between the ramp transverse 24 and the mixed inlet duct 22. The burnt gases coming from the transverse ramp can thus pass to the mixed inlet duct 22 along the deflector 26 then to the recirculation duct 56 when the valve opens EGR.

Les gaz brulés issus de la canalisation 55 d'extrémité latérale sont dirigés vers le plénum 25 et plus particulièrement vers la chambre d'accès 28 vers la turbine 27. Au débouché de la face d'échappement, lesdits gaz sont dirigés dans le conduit d'entrée mixte 22 dont la section de passage à cet endroit est beaucoup plus grande que la section de passage de la canalisation d'extrémité latérale 55, ce qui accroit les pertes de charge. Le déflecteur 26 favorise cet écoulement des gaz en réduisant sensiblement la section de passage dans le conduit d'entrée mixte 22.The burnt gases from the lateral end pipe 55 are directed towards the plenum 25 and more particularly towards the access chamber 28 towards the turbine 27. At the outlet of the exhaust face, said gases are directed into the conduit d 'mixed inlet 22 whose passage section at this location is much larger than the passage section of the lateral end pipe 55, which increases the pressure losses. The deflector 26 promotes this flow of gases by appreciably reducing the passage section in the mixed inlet duct 22.

Pour améliorer le passage des gaz de la canalisation d'extrémité 55 vers le conduit de recirculation 56, on peut prévoir de réduire la paroi de séparation entre ladite canalisation d'échappement 55 et le conduit de recirculation 56, par exemple en permettant une liaison entre lesdits deux conduits juste avant la bouche de sortie 60 de la face d'échappement ou en rabotant légèrement l'angle 61 de la paroi de séparation 62 entre la canalisation d'extrémité et le conduit de recirculation avant la face d'échappement de la culasse pour obtenir un arrondi.To improve the passage of gases from the end pipe 55 to the recirculation pipe 56, provision may be made to reduce the partition wall between said exhaust pipe 55 and the recirculation pipe 56, for example by allowing a connection between said two conduits just before the outlet mouth 60 of the exhaust face or by slightly planing the angle 61 of the partition wall 62 between the end pipe and the recirculation conduit before the exhaust face of the cylinder head to obtain a rounding.

Selon les vitesses des gaz, lesdits gaz sont dirigés par les parois du collecteur 20 et du déflecteur 26 en vis-à-vis avec les débouchés des conduits d'entrée 21,22 pour arriver dans le conduit de recirculation. Les écoulements des gaz brulés sont ainsi représentés par des flèches en figure 2.Depending on the gas velocities, said gases are directed through the walls of the manifold 20 and the deflector 26 opposite the outlets of the inlet conduits 21, 22 to arrive in the recirculation conduit. The flows of burnt gases are thus represented by arrows in figure 2 .

Claims (8)

  1. Exhaust-gas recirculation system (100) for a combustion engine comprising a cylinder head (50) in which there are formed:
    - first lines (53),
    - a lateral end line (55), all the lines being connected to combustion chambers,
    - and an exhaust-gas recirculation duct (56) adjacent to the end line (55),
    all opening via a separate mouth (54, 60) of a cylinder head exhaust face into an exhaust manifold, each of the lines being connected to a separate inlet duct (21, 22) of the manifold (20) then opening into an intake plenum (25) of the manifold,
    the recirculation duct (56) and the adjacent end line (55) opening from the exhaust face (52) via one and the same end mouth (60) into one and the same mixed inlet duct (22) of the exhaust manifold upstream of the outlet into the intake plenum (25),
    characterized in that the manifold comprises a deflector (26) arranged opposite the outlet (22av) of the mixed inlet duct (22) and reducing the passage cross section of the mixed inlet duct (22) as far as the plenum (25).
  2. Recirculation system (100) according to Claim 1, characterized in that the deflector extends a wall opposite the outlet (22av) of the mixed inlet duct (22).
  3. Recirculation system (100) according to either one of Claims 1 and 2, characterized in that the mixed inlet duct (22) of the manifold (20) has a gas passage cross section (23) reducing from an upstream part connected to the outlet mouth of the recirculation duct and the adjacent end line to the outlet (22av) connected to the plenum of the manifold.
  4. Recirculation system (100) according to any one of Claims 1 to 3, characterized in that the inlet ducts (21) connected to the first lines (53) are connected to a transverse ramp (24) of constant passage cross section and equal to the passage cross section (23) of said inlet ducts (21) opening into the plenum.
  5. Recirculation system (100) according to Claim 4, characterized in that the recirculation duct (56) comprises a downstream end (57') opening from a lateral coupling face (59) of the cylinder head.
  6. Recirculation system (100) according to any one of Claims 1 to 5, characterized in that the plenum (25) comprises an access chamber (28) to a turbine.
  7. Recirculation system (100) according to any one of Claims 4 to 6, characterized in that the transverse ramp (24) and the mixed inlet duct (22) have an axis directed towards the access chamber (28) to the turbine.
  8. Motor vehicle combustion engine comprising an exhaust-gas recirculation system (100) according to any one of Claims 1 to 7.
EP18153915.6A 2017-04-12 2018-01-29 High-pressure gas recirculation system for an internal combustion engine Active EP3388659B1 (en)

Applications Claiming Priority (1)

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FR1753206A FR3065261B1 (en) 2017-04-12 2017-04-12 HIGH PRESSURE GAS RECIRCULATION SYSTEM FOR THERMAL ENGINES

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Publication number Priority date Publication date Assignee Title
JP3579643B2 (en) * 2000-10-13 2004-10-20 本田技研工業株式会社 Engine cylinder head
JP5508621B2 (en) * 2009-08-20 2014-06-04 ダイハツ工業株式会社 Exhaust gas recirculation device in internal combustion engine
JP5843865B2 (en) * 2011-08-10 2016-01-13 本田技研工業株式会社 EGR device for internal combustion engine
KR20130037981A (en) * 2011-10-07 2013-04-17 현대자동차주식회사 Exhaust port structure of cylinder head
KR20140065084A (en) * 2012-11-21 2014-05-29 현대자동차주식회사 Cylinder head integrated exhaust manifold and diffuser
FR3000999A1 (en) * 2013-01-14 2014-07-18 Peugeot Citroen Automobiles Sa Combustion engine i.e. three-cylinder combustion engine, for car, has separation edge placed in front of introduction openings of exhaust gas from combustion cylinder into exhaust manifold such that wall divides exhaust gas into flows
JP6079405B2 (en) * 2013-04-19 2017-02-15 スズキ株式会社 Exhaust gas recirculation device for vehicle engine

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FR3065261B1 (en) 2021-01-01
FR3065261A1 (en) 2018-10-19

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