EP2024630B1 - Internal combustion engine comprising an exhaust gas recirculation system - Google Patents

Internal combustion engine comprising an exhaust gas recirculation system Download PDF

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Publication number
EP2024630B1
EP2024630B1 EP07766013A EP07766013A EP2024630B1 EP 2024630 B1 EP2024630 B1 EP 2024630B1 EP 07766013 A EP07766013 A EP 07766013A EP 07766013 A EP07766013 A EP 07766013A EP 2024630 B1 EP2024630 B1 EP 2024630B1
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EP
European Patent Office
Prior art keywords
circuit
main
exhaust gas
cold
cylinder head
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Not-in-force
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EP07766013A
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German (de)
French (fr)
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EP2024630A1 (en
Inventor
Cedrick Hennion
Jacques Portalier
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PSA Automobiles SA
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Peugeot Citroen Automobiles SA
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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
    • 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
    • F02M26/23—Layout, e.g. schematics
    • F02M26/25—Layout, e.g. schematics with coolers having bypasses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • 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
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
    • 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
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/09—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine
    • F02M26/10—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine having means to increase the pressure difference between the exhaust and intake system, e.g. venturis, variable geometry turbines, check valves using pressure pulsations or throttles in the air intake or exhaust system

Definitions

  • the present invention claims the priority of the French application 0652502 filed on 07/06/2006 .
  • the invention relates to an internal combustion engine equipped with an exhaust gas recirculation circuit.
  • This EGR circuit must therefore pass from the exhaust manifold to the intake manifold in fresh gas from the vehicle.
  • it is chosen to implement this circuit by passing through the cylinder head, near the water core.
  • the recirculation gases are cooled by this crossing.
  • this cooling is favorable especially for the reduction of NOx gas emissions and moreover, the EGR circuit is usually equipped with a heat exchanger in which circulates the coolant. the engine to further cool the exhaust before reintroducing it to the intake.
  • the invention proposes an internal combustion engine having an exhaust gas recirculation circuit whose flow rate is regulated by main control means, said recirculation circuit passing through the cylinder head and comprising a main branch and a branch. cold associated with a heat exchanger and means for regulating the flow of recirculated gas admitted into the cold leg, the portion of the circuit passing through the cylinder head being constituted by a double concentric tube, the inner tube being part of the main branch and the outer tube of the cold branch.
  • the main branch is thermally insulated from the cylinder head by the outer tube. In the critical phases for which no cooling of the recirculated gases is desirable, the flow is stopped in the cold leg.
  • the main control means are located downstream from the branch point of the main and cold branches, then the cold branch is always full of relatively hot exhaust gases (even if they are cooled by the cylinder head) so the inner tube is always maintained in temperature.
  • the figure 1 is a schematic view of an exhaust gas recirculation circuit of an internal combustion engine
  • the figure 2 is a diagram of an exhaust gas recirculation circuit according to the invention.
  • the figure 1 illustrates very schematically an internal combustion engine, especially for motor vehicles.
  • the engine 1 comprises a number of cylinders 2 (here four in number aligned on a bench) forming combustion chambers, in which pistons move.
  • Each cylinder is supplied with fresh gas by a so-called intake circuit, generally designated 3.
  • This intake circuit opens onto an intake manifold 4, valves, of which the opening and closing are controlled for example by a camshaft, to control each engine cycle the amount of fresh gas admitted into the cylinder.
  • Fuel is also injected into the cylinders, and the air-fuel mixture is ignited, either following the compression of the mixture (diesel engine) or in a controlled manner using for example spark plugs.
  • the burnt gases from the combustion in the cylinders are collected by an exhaust manifold 5 and then directed to the actual exhaust line.
  • This exhaust line 6 typically comprises a turbine 7, rotated by the exhaust gas, energizing a compressor 8 associated with the intake circuit.
  • the exhaust line 6 comprises elements making it possible to limit the discharges of pollutants such as, for example, an oxidation catalyst 9 associated with a particle filter 10 in the case of a diesel engine. These means are well known to those skilled in the art and there is no need to specify them in more detail, as it is necessary to specify that these pollution control elements can be adapted according to the engine.
  • the intake circuit essentially comprises an air filter 10, the compressor 8 associated with the turbine and a heat exchanger 11, placed downstream of the compressor and ensuring a heat exchange between the heated air through its passage through compressor and a heat transfer liquid, such as water, cooled for example by a fan sucking air at the front of the vehicle (the cooling circuit is not shown schematically on this figure 1 ), and the air heated by its passage through the compressor.
  • a heat transfer liquid such as water
  • a bypass 12 makes it possible to return a fraction of the exhaust gas to the level of the intake.
  • Main means 13 for regulating the flow of exhaust gas admitted to circulate in this branch are provided, such as for example a pilot valve.
  • the exhaust gas recirculation circuit itself has a branch branch, called cold branch 14, associated with a heat exchanger. Secondary means 15 for regulating the flow of recirculated gases admitted into the cold leg are provided.
  • the main branch of the recirculated gas in which the gases are not cooled by a heat exchanger, is also called hot branch 16, the term "main branch" may seem somewhat improper if the vast majority of recirculated gas flow is actually diverted to the cold branch.
  • the exhaust gas recirculation circuit has been shown as a totally external circuit to the engine block.
  • a fairly common layout plan assumes a crossing of the cylinder head by this circuit as shown in FIG. figure 2 .
  • the conduit 12 thus passes through the cylinder head 17 of the engine 1 connecting the exhaust manifold 5 to the downstream part of the exhaust gas recirculation circuit, on the intake side.
  • the main valve 13 controls the amount of gas readmitted to the intake.
  • the admission to the cold branch 14, provided with an exchanger 18 for cooling the exhaust gas is controlled by a mixer 16.
  • the engine cooling circuit necessarily comprises a cooling of the cylinder head, with such an implantation, it is clear that the recycled exhaust gas is subjected to a first cooling during the crossing of the cylinder head.
  • the cold branch 14 has its origin upstream of the crossing of the cylinder head, and preferably, as in the case shown in FIG. figure 3 , opens directly from the collector (or part of the exhaust circuit downstream thereof), so that the ducts associated respectively with the cold branch 14 and the hot leg 16 are concentric, the hot leg being isolated from the cylinder head by the cold branch, and coming to join the cold branch downstream of the exchanger 18
  • the central tube which contains recirculated gases not intended to be cooled, is in contact only with its outer concentric tube which provides a thermal insulation by air knife. This allows these gases to pass through the cylinder head with very little loss of temperature.
  • the outer tube which contains the recirculated gases for cooling, is as for a conventional system, in contact with the cylinder head which cools it.
  • the two streams of recirculated gas are found outside the cylinder head after the exchanger 18 and are mixed in a mixer 15 which allows the regulation of the temperature.
  • the total flow rate of the recirculated gases is then regulated by the valve 13.

Abstract

The invention relates to an internal combustion engine (1) comprising an exhaust gas recirculation circuit, the throughput of said circuit being regulated by main regulation means (13). The recirculation circuit passes through the cylinder head and comprises a main arm (16) and a cold arm (14) associated with a heat exchanger, and means (15) for regulating the throughput of the recirculated gas supplied to the cold arm. According to the invention, the part of the circuit passing through the cylinder head consists of a concentric double tube, the inner tube forming part of the main arm and the outer tube forming part of the cold arm.

Description

La présente invention revendique la priorité de la demande française 0652502 déposée le 07/06/2006 .The present invention claims the priority of the French application 0652502 filed on 07/06/2006 .

L'invention se rapporte à un moteur à combustion interne équipé d'un circuit de recirculation de gaz d'échappement.The invention relates to an internal combustion engine equipped with an exhaust gas recirculation circuit.

Des moteurs à combustion interne selon le préambule de la revendication 1 sont aussi décrits dans les documents EP 1 555 421 A , WO 2005/042960 A et US 2002/043254 A .Internal combustion engines according to the preamble of claim 1 are also described in the documents EP 1 555 421 A , WO 2005/042960 A and US 2002/043254 A .

Pour respecter les normes visant à réduire les émissions indésirables, notamment les émissions d'oxydes d'azote (NOx), une partie des gaz d'échappement d'un moteur à combustion interne est recyclée au moyen d'un circuit de recyclage le plus souvent dénommé circuit EGR (acronyme des termes anglais « Exhaust Gas Recirculation »).To meet standards to reduce unwanted emissions, including nitrogen oxide (NOx) emissions, some of the exhaust from an internal combustion engine is recycled using the most efficient recycling circuit. often referred to as EGR circuit (acronym for "Exhaust Gas Recirculation").

Ce circuit EGR doit donc passer du collecteur d'échappement au collecteur d'admission en gaz frais du véhicule. Sur de nombreux moteurs, notamment pour tenir compte d'un espace sous capot limité, il est choisi d'implanter ce circuit en le faisant traverser la culasse, à proximité du noyau d'eau. De ce fait, les gaz de recirculation sont refroidis par cette traversée. Pour l'essentiel des phases de fonctionnement du moteur, ce refroidissement est favorable notamment pour la réduction des émissions de gaz NOx et d'ailleurs, le circuit EGR est le plus souvent muni d'un échangeur de chaleur dans lequel circule le liquide de refroidissement du moteur pour refroidir plus encore les gaz d'échappement avant de les réintroduire au niveau de l'admission.This EGR circuit must therefore pass from the exhaust manifold to the intake manifold in fresh gas from the vehicle. On many engines, especially to take into account a limited hood space, it is chosen to implement this circuit by passing through the cylinder head, near the water core. As a result, the recirculation gases are cooled by this crossing. For most of the engine operating phases, this cooling is favorable especially for the reduction of NOx gas emissions and moreover, the EGR circuit is usually equipped with a heat exchanger in which circulates the coolant. the engine to further cool the exhaust before reintroducing it to the intake.

Cependant, ces systèmes connus ne sont pas satisfaisants dans certaines situations de fonctionnement du moteur pour lesquelles il serait au contraire favorable de conserver des gaz d'échappement chauds. Ces situations se retrouvent par exemple lors d'un démarrage à froid du véhicule ou dans les phases de régénération du filtre à particules.However, these known systems are unsatisfactory in certain engine operating situations for which it would otherwise be favorable to keep hot exhaust gases. These situations are found for example during a cold start of the vehicle or in the regeneration phases of the particulate filter.

Il serait donc souhaitable de prévoir des moyens pour maîtriser plus précisément la température des gaz d'échappement recyclés.It would therefore be desirable to provide means for controlling more precisely the temperature of the recycled exhaust gas.

A cette fin, l'invention propose un moteur à combustion interne ayant un circuit de recirculation de gaz d'échappement dont le débit est régulé par des moyens de régulation principaux, ledit circuit de recirculation traversant la culasse et comportant une branche principale et une branche froide associée à un échangeur thermique et des moyens de régulation du débit de gaz recirculés admis dans la branche froide, la portion de circuit traversant la culasse étant constituée par un double tube concentrique, le tube interne étant partie de la branche principale et le tube externe de la branche froide.To this end, the invention proposes an internal combustion engine having an exhaust gas recirculation circuit whose flow rate is regulated by main control means, said recirculation circuit passing through the cylinder head and comprising a main branch and a branch. cold associated with a heat exchanger and means for regulating the flow of recirculated gas admitted into the cold leg, the portion of the circuit passing through the cylinder head being constituted by a double concentric tube, the inner tube being part of the main branch and the outer tube of the cold branch.

Avec la nouvelle implantation du circuit EGR proposée par l'invention, la branche principale est isolée thermiquement de la culasse par le tube externe. Dans les phases critiques pour lesquelles aucun refroidissement des gaz recirculés n'est souhaitable, le débit est stoppé dans la branche froide.With the new implantation of the EGR circuit proposed by the invention, the main branch is thermally insulated from the cylinder head by the outer tube. In the critical phases for which no cooling of the recirculated gases is desirable, the flow is stopped in the cold leg.

Si de plus, selon un mode de réalisation de l'invention particulièrement avantageux les moyens de régulation principaux sont situés en aval du point de dérivation des branches principale et froide, alors la branche froide est toujours pleine de gaz d'échappement relativement chauds (même s'ils sont refroidis par la culasse) donc le tube interne est toujours maintenu en température.If, in addition, according to a particularly advantageous embodiment of the invention, the main control means are located downstream from the branch point of the main and cold branches, then the cold branch is always full of relatively hot exhaust gases (even if they are cooled by the cylinder head) so the inner tube is always maintained in temperature.

D'autres avantages et particularités de l'invention ressortent de la description de modes de réalisation faite ci-après en référence aux dessins annexés dans lesquels :Other advantages and particularities of the invention appear from the description of embodiments given below with reference to the appended drawings in which:

La figure 1 est une vue schématique d'un circuit de recirculation des gaz d'échappement d'un moteur à combustion interneThe figure 1 is a schematic view of an exhaust gas recirculation circuit of an internal combustion engine

La figure 2 est un schéma d'un circuit de recirculation des gaz d'échappement selon l'invention.The figure 2 is a diagram of an exhaust gas recirculation circuit according to the invention.

La figure 1 illustre de façon très schématique un moteur à combustion interne, notamment pour véhicules automobiles. Le moteur 1 comprend un certain nombre de cylindres 2 (ici au nombre de 4 alignés sur un banc) formant des chambres de combustion, dans lesquels se meuvent des pistons. Chaque cylindre est alimenté en gaz frais par un circuit dit d'admission, généralement désigné en 3. Ce circuit d'admission débouche sur un collecteur d'admission 4, des soupapes, dont l'ouverture et la fermeture sont commandées par exemple par un arbre à cames, permettant de contrôler à chaque cycle moteur la quantité de gaz frais admise dans le cylindre.The figure 1 illustrates very schematically an internal combustion engine, especially for motor vehicles. The engine 1 comprises a number of cylinders 2 (here four in number aligned on a bench) forming combustion chambers, in which pistons move. Each cylinder is supplied with fresh gas by a so-called intake circuit, generally designated 3. This intake circuit opens onto an intake manifold 4, valves, of which the opening and closing are controlled for example by a camshaft, to control each engine cycle the amount of fresh gas admitted into the cylinder.

Du carburant est par ailleurs injecté dans les cylindres, et le mélange air-carburant est enflammé, soit suite à la compression du mélange (moteur dit Diesel) soit de façon commandée en utilisant par exemple des bougies d'allumage.Fuel is also injected into the cylinders, and the air-fuel mixture is ignited, either following the compression of the mixture (diesel engine) or in a controlled manner using for example spark plugs.

Les gaz brûlés issus de la combustion dans les cylindres sont collectés par un collecteur d'échappement 5 puis dirigés vers la ligne d'échappement proprement dite. Cette ligne d'échappement 6 comporte typiquement une turbine 7, mise en rotation par les gaz d'échappement, énergisant un compresseur 8 associé au circuit d'admission. Par ailleurs, la ligne d'échappement 6 comporte des éléments permettant de limiter les rejets de polluants comme par exemple un catalyseur d'oxydation 9 associé à un filtre à particule 10 dans le cas d'un moteur Diesel. Ces moyens sont bien connus de l'homme de l'art et il n'est nul besoin de les préciser plus en détail, comme il n'est besoin de préciser que ces éléments de dépollution peuvent être adaptés en fonction de la motorisation.The burnt gases from the combustion in the cylinders are collected by an exhaust manifold 5 and then directed to the actual exhaust line. This exhaust line 6 typically comprises a turbine 7, rotated by the exhaust gas, energizing a compressor 8 associated with the intake circuit. Moreover, the exhaust line 6 comprises elements making it possible to limit the discharges of pollutants such as, for example, an oxidation catalyst 9 associated with a particle filter 10 in the case of a diesel engine. These means are well known to those skilled in the art and there is no need to specify them in more detail, as it is necessary to specify that these pollution control elements can be adapted according to the engine.

Le circuit d'admission comporte pour sa part essentiellement un filtre à air 10, le compresseur 8 associé à la turbine et un échangeur de chaleur 11, placé en aval du compresseur et assurant un échange thermique entre l'air échauffé par son passage au travers du compresseur et un liquide caloporteur, comme de l'eau, refroidi par exemple par un ventilateur aspirant de l'air à l'avant du véhicule (le circuit de refroidissement n'étant pas schématisé sur cette figure 1), et l'air échauffé par son passage au travers du compresseur.The intake circuit essentially comprises an air filter 10, the compressor 8 associated with the turbine and a heat exchanger 11, placed downstream of the compressor and ensuring a heat exchange between the heated air through its passage through compressor and a heat transfer liquid, such as water, cooled for example by a fan sucking air at the front of the vehicle (the cooling circuit is not shown schematically on this figure 1 ), and the air heated by its passage through the compressor.

Pour mieux contrôler les émissions de polluants, une dérivation 12 permet de faire renvoyer une fraction des gaz d'échappement au niveau de l'admission. Des moyens principaux 13 de régulation du débit de gaz d'échappement admis à circuler dans cette dérivation sont prévus, tels par exemple une vanne pilotée.To better control pollutant emissions, a bypass 12 makes it possible to return a fraction of the exhaust gas to the level of the intake. Main means 13 for regulating the flow of exhaust gas admitted to circulate in this branch are provided, such as for example a pilot valve.

De plus, le circuit de recirculation des gaz d'échappement comporte lui-même une branche dérivée, dite branche froide 14, associée à un échangeur thermique. Des moyens secondaires 15 de régulation du débit de gaz recirculés admis dans la branche froide sont prévus. Pour plus de clarté, la branche principale du circuit de gaz recirculés, dans laquelle les gaz ne sont pas refroidis par un échangeur thermique, est encore appelée branche chaude 16, le terme de « branche principale » pouvant sembler quelque peu impropre si la grande majorité du flux de gaz recirculés est en fait dévié vers la branche froide.In addition, the exhaust gas recirculation circuit itself has a branch branch, called cold branch 14, associated with a heat exchanger. Secondary means 15 for regulating the flow of recirculated gases admitted into the cold leg are provided. For the sake of clarity, the main branch of the recirculated gas, in which the gases are not cooled by a heat exchanger, is also called hot branch 16, the term "main branch" may seem somewhat improper if the vast majority of recirculated gas flow is actually diverted to the cold branch.

Dans le schéma de principe de la figure 1, le circuit de recirculation des gaz d'échappement a été représenté comme un circuit totalement extérieur au bloc moteur. En pratique, un schéma assez courant d'implantation suppose une traversée de la culasse par ce circuit comme illustré à la figure 2.In the schematic diagram of the figure 1 , the exhaust gas recirculation circuit has been shown as a totally external circuit to the engine block. In practice, a fairly common layout plan assumes a crossing of the cylinder head by this circuit as shown in FIG. figure 2 .

Selon cette implantation, le conduit 12 traverse donc la culasse 17 du moteur 1 connectant le collecteur d'échappement 5 à la partie aval du circuit de recirculation des gaz d'échappement, du côté de l'admission. La vanne principale 13 permet de contrôler la quantité de gaz réadmis à l'admission. L'admission vers la branche froide 14, munie d'un échangeur 18 pour le refroidissement des gaz d'échappement est contrôlée par un mitigeur 16.According to this implementation, the conduit 12 thus passes through the cylinder head 17 of the engine 1 connecting the exhaust manifold 5 to the downstream part of the exhaust gas recirculation circuit, on the intake side. The main valve 13 controls the amount of gas readmitted to the intake. The admission to the cold branch 14, provided with an exchanger 18 for cooling the exhaust gas is controlled by a mixer 16.

Comme circuit de refroidissement du moteur comporte nécessairement un refroidissement de la culasse, avec une telle implantation, il est clair que les gaz d'échappement recyclés sont soumis à un premier refroidissement lors de la traversée de la culasse.As the engine cooling circuit necessarily comprises a cooling of the cylinder head, with such an implantation, it is clear that the recycled exhaust gas is subjected to a first cooling during the crossing of the cylinder head.

Si un refroidissement des gaz d'échappement est souhaité, avec une ouverture plus ou moins grande des moyens de régulation du débit de gaz recirculés admis dans la branche froide du circuit de recirculation des gaz d'échappement, il est clair que ce refroidissement par la culasse est en fait un avantage.If an exhaust gas cooling is desired, with a greater or lesser opening of the recirculated gas flow control means admitted into the cold leg of the exhaust gas recirculation circuit, it is clear that this cooling by the breech is actually an advantage.

Par contre, dans les quelques phases de fonctionnement où il serait souhaitable de conserver une grande partie de la chaleur des gaz d'échappement pour augmenter la température des gaz à l'entrée du moteur, alors ce refroidissement par la culasse devient gênant.By cons, in the few operating phases where it would be desirable to retain much of the heat of the exhaust gas to increase the temperature of the gas at the engine inlet, then this cooling by the cylinder head becomes troublesome.

C'est pourquoi il est proposé selon l'invention une modification du circuit de sorte que la branche froide 14 ait son origine en amont de la traversée de la culasse, et de préférence, comme dans le cas représenté à la figure 3, débouche directement du collecteur (ou d'une partie du circuit d'échappement en aval de celui-ci), de sorte que les conduits associés respectivement à la branche froide 14 et la branche chaude 16 soient concentriques, la branche chaude étant isolée de la culasse par la branche froide, et venant rejoindre la branche froide en aval de l'échangeur 18This is why it is proposed according to the invention a modification of the circuit so that the cold branch 14 has its origin upstream of the crossing of the cylinder head, and preferably, as in the case shown in FIG. figure 3 , opens directly from the collector (or part of the exhaust circuit downstream thereof), so that the ducts associated respectively with the cold branch 14 and the hot leg 16 are concentric, the hot leg being isolated from the cylinder head by the cold branch, and coming to join the cold branch downstream of the exchanger 18

Avec une telle implantation, il est plus simple de placer la vanne principale 13 de régulation du débit de gaz circulés après le point de jonction des branches chaude et froide où se situe le mitigeur 15.With such an implementation, it is easier to place the main valve 13 for regulating the flow of gas circulated after the junction point of the hot and cold branches where the mixer 15 is located.

Ainsi le tube central, qui contient les gaz recirculés non destinés à être refroidis, n'est en contact qu'avec son tube concentrique extérieur qui lui fournit une isolation thermique par lame d'air. Cela permet à ces gaz de traverser la culasse avec très peu de perte de température. Le tube extérieur, qui contient les gaz recirculés destinés au refroidissement, est comme pour un système classique, en contact avec la culasse qui le refroidit.Thus the central tube, which contains recirculated gases not intended to be cooled, is in contact only with its outer concentric tube which provides a thermal insulation by air knife. This allows these gases to pass through the cylinder head with very little loss of temperature. The outer tube, which contains the recirculated gases for cooling, is as for a conventional system, in contact with the cylinder head which cools it.

Les deux flux de gaz recirculés (chaud et froid) se retrouvent hors culasse après l'échangeur 18 et sont mélangés dans un mitigeur 15 qui permet la régulation de la température. Le débit total des gaz recirculés est ensuite régulé par la vanne 13.The two streams of recirculated gas (hot and cold) are found outside the cylinder head after the exchanger 18 and are mixed in a mixer 15 which allows the regulation of the temperature. The total flow rate of the recirculated gases is then regulated by the valve 13.

Claims (3)

  1. Internal combustion engine having an exhaust gas recirculation circuit the flow rate of which is regulated by main regulating means, the said recirculation circuit passing through the cylinder head and comprising a main leg and a cold leg associated with a heat exchanger and means of regulating the flow rate of recirculated gases admitted to the cold leg, characterized in that the portion of circuit that passes through the cylinder head consists of a double concentric tube, the inner tube being part of the main leg and the outer tube part of the cold leg.
  2. Engine according to Claim 1, characterized in that the main regulating means are situated downstream of the main and cold leg branch of point.
  3. Engine according to one of Claims 1 to 2, characterized in that the main leg and cold leg open into the exhaust circuit.
EP07766013A 2006-06-07 2007-05-09 Internal combustion engine comprising an exhaust gas recirculation system Not-in-force EP2024630B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0652502A FR2902151B1 (en) 2006-06-07 2006-06-07 INTERNAL COMBUSTION ENGINE HAVING AN EXHAUST GAS RECIRCULATION CIRCUIT
PCT/FR2007/051233 WO2007141435A1 (en) 2006-06-07 2007-05-09 Internal combustion engine comprising an exhaust gas recirculation system

Publications (2)

Publication Number Publication Date
EP2024630A1 EP2024630A1 (en) 2009-02-18
EP2024630B1 true EP2024630B1 (en) 2010-09-01

Family

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Application Number Title Priority Date Filing Date
EP07766013A Not-in-force EP2024630B1 (en) 2006-06-07 2007-05-09 Internal combustion engine comprising an exhaust gas recirculation system

Country Status (6)

Country Link
EP (1) EP2024630B1 (en)
AT (1) ATE479835T1 (en)
DE (1) DE602007008884D1 (en)
ES (1) ES2350277T3 (en)
FR (1) FR2902151B1 (en)
WO (1) WO2007141435A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011109264A1 (en) * 2011-08-03 2013-02-07 Man Truck & Bus Ag Exhaust gas recirculation device for an internal combustion engine of a vehicle and method for operating an exhaust gas recirculation device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0980966B1 (en) * 1998-08-19 2002-05-08 Bayerische Motoren Werke Aktiengesellschaft Exhaust system with reservoir for an internal combustion engine
JP3579643B2 (en) * 2000-10-13 2004-10-20 本田技研工業株式会社 Engine cylinder head
DE10260251A1 (en) * 2002-12-20 2004-07-01 Siemens Ag Cooling element for gases
EP2259000B1 (en) * 2003-10-17 2011-10-05 Honeywell International Inc. Internal bypass exhaust gas cooler
JP4323333B2 (en) * 2004-01-19 2009-09-02 株式会社マーレ フィルターシステムズ Exhaust gas recirculation device for internal combustion engine

Also Published As

Publication number Publication date
EP2024630A1 (en) 2009-02-18
FR2902151A1 (en) 2007-12-14
DE602007008884D1 (en) 2010-10-14
ATE479835T1 (en) 2010-09-15
ES2350277T3 (en) 2011-01-20
WO2007141435A1 (en) 2007-12-13
FR2902151B1 (en) 2008-08-08

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