WO2016102798A1 - Device for recirculating exhaust gases for a motor vehicle internal combustion engine - Google Patents

Device for recirculating exhaust gases for a motor vehicle internal combustion engine Download PDF

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Publication number
WO2016102798A1
WO2016102798A1 PCT/FR2015/053409 FR2015053409W WO2016102798A1 WO 2016102798 A1 WO2016102798 A1 WO 2016102798A1 FR 2015053409 W FR2015053409 W FR 2015053409W WO 2016102798 A1 WO2016102798 A1 WO 2016102798A1
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WO
WIPO (PCT)
Prior art keywords
exhaust gas
cooler
gases
circuit
engine
Prior art date
Application number
PCT/FR2015/053409
Other languages
French (fr)
Inventor
Eric Pain
Original Assignee
Renault S.A.S.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault S.A.S. filed Critical Renault S.A.S.
Priority to EP15817987.9A priority Critical patent/EP3237742A1/en
Publication of WO2016102798A1 publication Critical patent/WO2016102798A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/71—Multi-way valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream 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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • 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
    • 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
    • F02M26/33—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 controlling the temperature of the recirculated gases
    • 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
    • F02M26/42—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders
    • F02M26/44—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders in which a main EGR passage is branched into multiple passages
    • 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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/39—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with two or more EGR valves disposed in series
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • Exhaust gas recirculation device for an internal combustion engine of a motor vehicle
  • the invention relates to exhaust gas recirculation devices for an internal combustion engine of motor vehicles. It concerns, in particular, the cooling of the recirculated exhaust gas.
  • An exhaust gas recirculation (EGR) circuit is generally present in diesel fuel powertrains.
  • the main purpose of recirculation is to reduce nitrogen oxide emissions to the atmosphere.
  • EGR circuits Two types of EGR circuits are known: high pressure EGR circuits and low pressure EGR circuits.
  • high-pressure EGR circuit the combustion gases are captured upstream of the turbocharger turbine, and then returned to the combustion chamber.
  • the low pressure circuit the combustion gases are recovered at the outlet of the particulate filter placed downstream of the turbine of the turbocharger. They are cooled and then reinjected upstream of the compressor.
  • Low pressure EGR circuits are generally preferred because the temperatures of the exhaust gases captured are lower, which reduces the formation of nitrogen oxide (NOx) during combustion.
  • NOx nitrogen oxide
  • the first critical situation occurs when the engine is cold, especially when starting the vehicle.
  • the addition of fresh air into the combustion chamber results in a decrease in the temperature of the exhaust gas which induces a decrease in the temperature of the catalyst.
  • catalysis of pollutants requires a certain temperature to be effectively performed. If this temperature is not reached, the catalyst is inefficient and pollutants are released into the atmosphere.
  • the second critical situation in the use of the low pressure EGR circuit is during cold weather conditions, especially when the outside temperature is lower or lower. near 0 ° C.
  • the use of the low pressure EGR circuit leads to the production of acid condensates in the intake air. These condensates are formed during the passage in the heat exchanger air-air supercharging engine.
  • Document KR20120130887 proposes a solution in which the high-pressure cooler and the low-pressure cooler are assembled in the same room.
  • the flow of the exhaust gases from the high pressure circuit and the flow of the exhaust gases from the low pressure circuit flow in parallel.
  • Such a solution is not easily integrable on any type of vehicle because it is bulky.
  • JP20073 1523 1 A solution of the same type is also proposed by JP20073 1523 1.
  • This document describes a cooler, in which it is possible to simultaneously pass gas flows from the high pressure circuit and those of the low pressure circuit.
  • this system is complex, the cooler having a multitude of internal valves.
  • the object of the invention is to provide a simple and efficient exhaust gas recirculation device in which the gases are cooled and remain functional in cold climatic situations and when the engine is cold.
  • the object of the invention is therefore an exhaust gas recirculation device for an internal combustion engine equipped with a turbocharger for supercharging the engine and a device for aftertreatment of the gaseous effluents of the engine comprising a first exhaust gas recirculation circuit, connected to the outlet of the particulate filter downstream of the turbocharger turbine and upstream of the turbocharger compressor, and a second exhaust gas recirculation circuit, connected upstream of the turbocharger, turbocharger turbine and upstream of an air intake manifold in the engine cylinders.
  • the first and second exhaust gas recirculation circuits have a common conduit with a cooler.
  • the device includes a conduit connecting the upstream of the turbine to the second exhaust gas recirculation circuit, said conduit comprising a valve allowing exhaust gases to flow to the intake manifold bypassing the cooler.
  • This arrangement of the cooler allows the use of a common cooler for the first circuit, namely the low pressure circuit, and the second circuit, that is to say the high pressure circuit. This saves space in the engine compartment and provides an efficient exhaust gas recirculation system whatever the weather conditions.
  • the device also comprises valves capable of selectively directing the gases of the first or second recirculation circuit in the cooler.
  • the exchanger retains the same overall geometry as a conventional low pressure circuit exchanger, but the duct supplying this exchanger selectively transports high or low pressure gas.
  • This three-way valve makes it possible to simply select the flow of gas passing through the cooler. Indeed, such a valve has the particularity of having three branches. An outlet branch is attached to the conduit supplying the gas cooler, the two inlet branches are respectively connected to the first low pressure recirculation circuit and the second high-pressure gas recirculation circuit. Thus, by selectively opening one or the other of the inputs, it is possible to circulate one or the other of the gas flows.
  • the high-pressure circuit thus has a first branch going upstream of the turbine of the turbocharger and entering the cooler and a second branch running downstream of the cooler and entering the cylinders of the engine.
  • the low-pressure circuit for its part, has a first branch leaving at the outlet of the particulate filter placed downstream of the turbine of the turbocharger and entering the same cooler and a second branch leaving downstream of the cooler and feeding the compressor of the turbocharger.
  • the high-pressure branch captures the gases upstream of the turbine.
  • the gases are hot and compressed, they are then cooled in the cooler and introduced into the engine cylinders after being premixed with fresh compressed air.
  • the low pressure branch for its part, captures the gases at the outlet of the particulate filter placed downstream of the turbine.
  • the gases are relaxed and less hot than those of the branch at high pressure. They are cooled by passing through the cooler and mixed with fresh air upstream of the compressor.
  • the invention also relates to a motor vehicle engine comprising an exhaust gas recirculation device as defined above.
  • the invention also relates to a method for controlling an exhaust gas recirculation device in which valves are controlled to selectively direct the gases of the first or second circuit into the cooler.
  • valve control method allows optimal use of the two gas recirculation circuits.
  • the valves are controlled to direct the high pressure gas flow or the low pressure gas flow into the cooler.
  • a mixture of low and high pressure gases could also be ordered to optimize engine operation and minimize pollutant emissions.
  • FIG. 1 represents a motor provided with a device for recirculating gases according to a first embodiment of the invention
  • FIG. 2 represents a motor provided with a device for recirculating gases according to a second embodiment of the invention.
  • the engine 1 comprises a distributor 8a of air intake in the cylinders 8b supplied with fresh air by an intake line 22 and an exhaust manifold 8c which recovers combustion gases and which communicates with an exhaust line 11 provided with a device for post-treatment of gaseous effluents 10.
  • This post-processing device 10 comprises, for example, particulate filters.
  • the air intake line 22 is equipped with an air filter 2 and a flow meter 3.
  • the air admitted into the engine is compressed by a compressor 4 of a turbocharger 5.
  • a supercharger air-cooler air 6 is disposed downstream of the compressor 4.
  • the intake line 22 also comprises an intake flap 7 placed upstream of the distributor 8a.
  • the exhaust line 11 of the engine 1 is equipped with a turbine 9 of the turbocharger 5. This turbine 9 serves to relax the gaseous effluents from the engine 1.
  • the exhaust line 11 is also equipped with a exhaust flap 12.
  • An exhaust gas recirculation device 13 makes it possible to capture the off-gases at the outlet of the engine 1 for reinjecting them into the engine 1 after having mixed them with fresh air.
  • This device 13 comprises two circuits, a low-pressure circuit 14, connected at the outlet of the particulate filter placed downstream of the turbine 9 of the turbocharger 5 and upstream of the compressor 4 of the turbocharger 5, and a high-pressure circuit 15. , connected in upstream of the turbine 9 of the turbocharger 5 and upstream of an intake manifold 8a of air in the cylinders 8b of the engine 1.
  • These two circuits have a common conduit 16 with a cooler 17.
  • the low pressure circuit 14 captures the exhaust gas at the outlet of a particulate filter placed downstream of the turbine 9.
  • the expanded gases are cooled as they pass through the cooler 1 7. They then pass through a valve 1 8 of the low pressure recirculation circuit 14, to mix with the fresh air and supply the compressor 4.
  • the high-pressure circuit 15 captures the gases upstream of the turbine 9. These gases are also fed into the cooler 17.
  • the high-pressure circuit 15 continues downstream of the cooler via a conduit 20 carrying the exhaust gases through a valve 21 of the high pressure EGR circuit up to the distributor 8a.
  • Such an arrangement of the recirculation device makes it possible to have a single cooler 17 for the two high and low pressure circuits 15 and 14. Depending on the situation in which the vehicle is located, one chooses to use one or the other. other circuits.
  • the three-way valve 19 is oriented so as to pass the exhaust gases collected upstream of the turbine 9 in the cooler 17.
  • the expanded gases are, in turn, released into the atmosphere, the three-way valve 1 9 preventing their passage through the cooler 17.
  • the valve 1 8 at the outlet of the cooler 17 is also closed.
  • the cooled gases are thus directed through the valve 2 1 open to supply the cylinders 8b of the engine 1.
  • the three-way valve 19 is oriented so as to allow the passage of the gas expanded and prevent the arrival of gas captured upstream of the turbine 9. These gases are introduced into the cooler 17 through the conduit 16. The valve 21 is kept closed and the valve 1 8 is kept open. The recirculation gases are thus mixed with the fresh air upstream of the compressor 4.
  • FIG. 2 illustrates a diagram of a motor 1 equipped with an exhaust gas recirculation device 15 according to another embodiment.
  • the elements common to Figures 1 and 2 have the same references.
  • This latter embodiment differs from the first embodiment in that the three-way valve 19 is substituted by two valves 22 and 23.
  • the valve 22 is mounted on the high pressure circuit 15 of the recirculation device 13 upstream of the common conduit 16.
  • the valve 23 is mounted on the low-pressure circuit 14 upstream of the common duct 16.
  • the invention therefore allows an effective treatment of pollutants and ensures optimum operation of the engine of a motor vehicle, by proposing an exhaust gas recirculation device having two circuits, the first at low pressure and the second at high pressure.
  • This device has the particularity of having a cooler common to both circuits. Thus, depending on the climatic situation or as a function of the engine temperature, the gases of one or the other circuit pass through the cooler.
  • valve 25 is opened and the valves 22 and 23 are kept closed during the use phase of the uncooled high-pressure EGR gases.

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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)
  • Supercharger (AREA)

Abstract

The invention relates to a device for recirculating exhaust gases for an internal combustion engine (1) provided with a turbocompressor (5) for supercharging the engine and a device for after-treatment (10) of the exhaust gases from the engine, including a first circuit for recirculating exhaust gases, connected to the outlet of a particle filter placed downstream from the turbine (9) of the turbocompressor and upstream from the compressor (4) of the turbocompressor, and a second circuit for recirculating exhaust gases, connected upstream from the turbine of the turbocompressor and upstream from an air-intake diverter for the cylinders of the engine. The first and second circuits for recirculating exhaust gases include a common pipe (16) provided with a cooler (17).

Description

Dispositif de recirculation des gaz d'échappement pour moteur à combustion interne de véhicule automobile  Exhaust gas recirculation device for an internal combustion engine of a motor vehicle
L 'invention concerne les dispositifs de recirculation des gaz d' échappement pour moteur à combustion interne de véhicules automobiles. Elle concerne, en particulier, le refroidissement des gaz d' échappement recirculés. The invention relates to exhaust gas recirculation devices for an internal combustion engine of motor vehicles. It concerns, in particular, the cooling of the recirculated exhaust gas.
Un circuit de recirculation des gaz d' échappement (EGR) est généralement présent dans les groupes motopropulseurs carburant au Diesel. La recirculation a pour but principal de diminuer les émissions d' oxyde d' azote dans l ' atmosphère. Deux types de circuits EGR sont connus : les circuits EGR à haute pression et les circuits EGR à basse pression. Dans le circuit EGR à haute pression, les gaz de combustion sont captés en amont de la turbine du turbocompresseur, pour être ensuite réinj ectés dans la chambre de combustion. Au contraire, dans le circuit à basse pression, les gaz de combustion sont récupérés à la sortie du filtre à particules placé en aval de la turbine du turbocompresseur. Ils sont refroidis, puis réinj ectés en amont du compresseur. Les circuits EGR à basse pression sont généralement privilégiés car les températures des gaz d' échappement captés sont plus faibles, ce qui diminue la formation d' oxyde d' azote (NOx) lors de la combustion. Cependant, il existe deux situations particulières lors desquelles le circuit EGR à basse pression n' est plus fonctionnel.  An exhaust gas recirculation (EGR) circuit is generally present in diesel fuel powertrains. The main purpose of recirculation is to reduce nitrogen oxide emissions to the atmosphere. Two types of EGR circuits are known: high pressure EGR circuits and low pressure EGR circuits. In the high-pressure EGR circuit, the combustion gases are captured upstream of the turbocharger turbine, and then returned to the combustion chamber. In contrast, in the low pressure circuit, the combustion gases are recovered at the outlet of the particulate filter placed downstream of the turbine of the turbocharger. They are cooled and then reinjected upstream of the compressor. Low pressure EGR circuits are generally preferred because the temperatures of the exhaust gases captured are lower, which reduces the formation of nitrogen oxide (NOx) during combustion. However, there are two particular situations in which the low pressure EGR circuit is no longer functional.
La première situation critique se produit lorsque le moteur est froid, au démarrage du véhicule notamment. Dans cette situation, l' ajout d' air frais dans la chambre de combustion entraîne une diminution de la température des gaz d' échappement qui induit une baisse de la température du catalyseur. Or, la catalyse des polluants nécessite une certaine température pour être efficacement effectuée. S i cette température n' est pas atteinte, le catalyseur n' est pas performant et des polluants sont rej etés dans l ' atmosphère .  The first critical situation occurs when the engine is cold, especially when starting the vehicle. In this situation, the addition of fresh air into the combustion chamber results in a decrease in the temperature of the exhaust gas which induces a decrease in the temperature of the catalyst. However, catalysis of pollutants requires a certain temperature to be effectively performed. If this temperature is not reached, the catalyst is inefficient and pollutants are released into the atmosphere.
La deuxième situation critique de l 'utilisation du circuit EGR basse pression se produit lors de conditions météorologiques froides, en particulier lorsque la température extérieure est inférieure ou avoisine 0° C . Dans cette situation, l 'utilisation du circuit EGR à basse pression conduit à la production de condensais acides dans l ' air d' admission. Ces condensais sont formés lors du passage dans l ' échangeur thermique air-air de suralimentation du moteur. The second critical situation in the use of the low pressure EGR circuit is during cold weather conditions, especially when the outside temperature is lower or lower. near 0 ° C. In this situation, the use of the low pressure EGR circuit leads to the production of acid condensates in the intake air. These condensates are formed during the passage in the heat exchanger air-air supercharging engine.
Une so lution consiste à équiper le circuit EGR haute pression d'un refroidisseur. Cependant, cette solution est encombrante et certaines architectures de moteur ne peuvent supporter de tels vo lumes supplémentaires .  One solution is to equip the high pressure EGR circuit with a cooler. However, this solution is cumbersome and some engine architectures can not support such additional vo lumes.
Une so lution alternative est de remplacer l ' échangeur air-air par un échangeur air-eau, ce qui permet de résoudre à la source le problème de la formation des condensais acides. Cependant, pour certaines architectures de véhicule, il n' y a pas suffisamment de place disponible pour utiliser un tel échangeur thermique.  An alternative solution is to replace the air-to-air exchanger with an air-water exchanger, which makes it possible to solve at the source the problem of the formation of acid condensates. However, for some vehicle architectures, there is not enough space available to use such a heat exchanger.
Le document KR20120130887 propose une so lution dans laquelle le refroidisseur à haute pression et le refroidisseur à basse pression sont assemblés dans la même pièce. Le flux des gaz d' échappement issus du circuit à haute pression et le flux des gaz d' échappement issus du circuit à basse pression circulent en parallèle. Une telle so lution n' est pas facilement intégrable sur tout type de véhicule car elle est encombrante.  Document KR20120130887 proposes a solution in which the high-pressure cooler and the low-pressure cooler are assembled in the same room. The flow of the exhaust gases from the high pressure circuit and the flow of the exhaust gases from the low pressure circuit flow in parallel. Such a solution is not easily integrable on any type of vehicle because it is bulky.
Une so lution du même type est également proposée par le document JP20073 1523 1 . Ce document décrit un refroidisseur, dans lequel il est possible de faire passer simultanément les flux de gaz issus du circuit à haute pression et ceux du circuit à basse pression. Cependant, ce système est complexe, le refroidisseur possédant une multitude de vannes internes .  A solution of the same type is also proposed by JP20073 1523 1. This document describes a cooler, in which it is possible to simultaneously pass gas flows from the high pressure circuit and those of the low pressure circuit. However, this system is complex, the cooler having a multitude of internal valves.
Le but de l 'invention est de réaliser un dispositif de recirculation des gaz d' échappement simp le et efficace, dans lequel les gaz sont refroidis et restant fonctionnel dans des situations climatiques froides et lorsque le moteur est froid.  The object of the invention is to provide a simple and efficient exhaust gas recirculation device in which the gases are cooled and remain functional in cold climatic situations and when the engine is cold.
L 'invention a donc pour obj et un dispositif de recirculation des gaz d' échappement pour moteur à combustion interne équipé d 'un turbocompresseur de suralimentation du moteur et d'un dispositif de post-traitement des effluents gazeux du moteur comprenant un premier circuit de recirculation des gaz d' échappement, raccordé à la sortie du filtre à particules placé en aval de la turbine du turbocompresseur et en amont du compresseur du turbocompresseur, et un deuxième circuit de recirculation des gaz d' échappement, raccordé en amont de la turbine du turbocompresseur et en amont d'un répartiteur d' admission d' air dans les cylindres du moteur. Le premier et le deuxième circuit de recirculation des gaz d' échappement comportent un conduit commun doté d'un refroidisseur. The object of the invention is therefore an exhaust gas recirculation device for an internal combustion engine equipped with a turbocharger for supercharging the engine and a device for aftertreatment of the gaseous effluents of the engine comprising a first exhaust gas recirculation circuit, connected to the outlet of the particulate filter downstream of the turbocharger turbine and upstream of the turbocharger compressor, and a second exhaust gas recirculation circuit, connected upstream of the turbocharger, turbocharger turbine and upstream of an air intake manifold in the engine cylinders. The first and second exhaust gas recirculation circuits have a common conduit with a cooler.
Le dispositif comprend un conduit reliant l' amont de la turbine au deuxième circuit de recirculation des gaz d' échappement, ledit conduit comprenant une vanne permettant aux gaz d' échappement de circuler vers le répartiteur d ' admission en contournant le refroidisseur.  The device includes a conduit connecting the upstream of the turbine to the second exhaust gas recirculation circuit, said conduit comprising a valve allowing exhaust gases to flow to the intake manifold bypassing the cooler.
Cette disposition du refroidisseur permet l'utilisation d 'un refroidisseur commun pour le premier circuit, à savoir le circuit à basse pression, et pour le deuxième circuit, c ' est-à-dire le circuit à haute pression. Cela permet un gain de place dans le compartiment moteur et d'o ffrir un dispositif de recirculation de gaz d' échappement performant quelles que soient les conditions climatiques.  This arrangement of the cooler allows the use of a common cooler for the first circuit, namely the low pressure circuit, and the second circuit, that is to say the high pressure circuit. This saves space in the engine compartment and provides an efficient exhaust gas recirculation system whatever the weather conditions.
Avantageusement, le dispositif comporte également des vannes aptes à diriger de manière sélective les gaz du premier ou du deuxième circuit de recirculation dans le refroidisseur.  Advantageously, the device also comprises valves capable of selectively directing the gases of the first or second recirculation circuit in the cooler.
Ainsi l ' échangeur conserve la même géométrie globale qu 'un échangeur traditionnel de circuit basse pression, mais le conduit alimentant cet échangeur transporte sélectivement des gaz à haute ou à basse pression.  Thus, the exchanger retains the same overall geometry as a conventional low pressure circuit exchanger, but the duct supplying this exchanger selectively transports high or low pressure gas.
Dans un mo de de réalisation, parmi les vannes équipant le dispositif de recirculation des gaz d' échappement, on compte au moins une vanne trois voies.  In one embodiment, among the valves equipping the exhaust gas recirculation device, there is at least one three-way valve.
Cette vanne trois voies permet de sélectionner de manière simple le flux de gaz passant dans le refroidisseur. En effet, une telle vanne a la particularité de posséder trois embranchements. Un embranchement de sortie est fixé au conduit alimentant le refroidisseur en gaz, les deux embranchements d' entrée sont respectivement connectés au premier circuit de recirculation à basse pression et au deuxième circuit de recirculation des gaz à haute pression. Ainsi, en ouvrant sélectivement l 'une ou l ' autre des entrées, il est possible de faire circuler l 'un ou l' autre des flux de gaz. This three-way valve makes it possible to simply select the flow of gas passing through the cooler. Indeed, such a valve has the particularity of having three branches. An outlet branch is attached to the conduit supplying the gas cooler, the two inlet branches are respectively connected to the first low pressure recirculation circuit and the second high-pressure gas recirculation circuit. Thus, by selectively opening one or the other of the inputs, it is possible to circulate one or the other of the gas flows.
Le circuit à haute pression possède donc une première branche partant en amont de la turbine du turbocompresseur et entrant dans le refroidisseur et une deuxième branche partant en aval du refroidisseur et entrant dans les cylindres du moteur. Le circuit à basse pression, pour sa part, possède une première branche partant à la sortie du filtre à particules placé en aval de la turbine du turbocompresseur et entrant dans le même refroidisseur et une deuxième branche partant en aval du refroidisseur et alimentant le compresseur du turbocompresseur.  The high-pressure circuit thus has a first branch going upstream of the turbine of the turbocharger and entering the cooler and a second branch running downstream of the cooler and entering the cylinders of the engine. The low-pressure circuit, for its part, has a first branch leaving at the outlet of the particulate filter placed downstream of the turbine of the turbocharger and entering the same cooler and a second branch leaving downstream of the cooler and feeding the compressor of the turbocharger.
La branche à haute pression capte les gaz en amont de la turbine. Les gaz sont chauds et comprimés, ils sont ensuite refroidis dans le refroidisseur puis introduits dans les cylindres du moteur après avoir été préalablement mélangés avec l ' air frais comprimé.  The high-pressure branch captures the gases upstream of the turbine. The gases are hot and compressed, they are then cooled in the cooler and introduced into the engine cylinders after being premixed with fresh compressed air.
La branche à basse pression, quant à elle, capte les gaz à la sortie du filtre à particules placé en aval de la turbine. Les gaz sont détendus et moins chauds que ceux de la branche à haute pression. Ils sont refroidis en passant au travers du refroidisseur puis mélangés avec l ' air frais en amont du compresseur.  The low pressure branch, for its part, captures the gases at the outlet of the particulate filter placed downstream of the turbine. The gases are relaxed and less hot than those of the branch at high pressure. They are cooled by passing through the cooler and mixed with fresh air upstream of the compressor.
L 'invention porte également sur un moteur de véhicule automobile comprenant un dispositif de recirculation des gaz d' échappement tel que défini précédemment.  The invention also relates to a motor vehicle engine comprising an exhaust gas recirculation device as defined above.
L 'invention porte aussi sur un procédé de pilotage d 'un dispositif de recirculation des gaz d' échappement dans lequel on commande des vannes pour diriger de manière sélective les gaz du premier ou du deuxième circuit dans le refroidisseur.  The invention also relates to a method for controlling an exhaust gas recirculation device in which valves are controlled to selectively direct the gases of the first or second circuit into the cooler.
Un tel procédé de pilotage des vannes permet une utilisation optimale des deux circuits de recirculation de gaz. Ainsi, selon les conditions climatiques et la température du moteur, on commande les vannes pour diriger le flux de gaz à haute pression ou le flux de gaz à basse pression dans le refroidisseur. On pourrait également commander un mélange des gaz à basse et à haute pression afin d' optimiser le fonctionnement du moteur et de minimiser les émissions de polluants . D'autres buts, avantages et caractéristiques de l'invention apparaîtront à l'examen de la description détaillée de deux modes de réalisation de l'invention, nullement limitatifs, et des dessins annexés sur lesquels : Such a valve control method allows optimal use of the two gas recirculation circuits. Thus, depending on the climatic conditions and the engine temperature, the valves are controlled to direct the high pressure gas flow or the low pressure gas flow into the cooler. A mixture of low and high pressure gases could also be ordered to optimize engine operation and minimize pollutant emissions. Other objects, advantages and features of the invention will appear on examining the detailed description of two embodiments of the invention, in no way limiting, and the appended drawings in which:
-la figure 1 représente un moteur pourvu d'un dispositif de recirculation des gaz selon un premier mode de réalisation de l'invention,  FIG. 1 represents a motor provided with a device for recirculating gases according to a first embodiment of the invention,
-la figure 2 représente un moteur pourvu d'un dispositif de recirculation des gaz selon un deuxième mode de réalisation de l'invention.  FIG. 2 represents a motor provided with a device for recirculating gases according to a second embodiment of the invention.
Le moteur 1 comporte un répartiteur 8a d'admission d'air dans les cylindres 8b alimenté en air frais par une ligne d'admission 22 et un collecteur d'échappement 8c qui récupère des gaz de combustion et qui communique avec une ligne d'échappement 11 munie d'un dispositif de post-traitement des effluents gazeux 10. Ce dispositif de post-traitement 10 comporte, par exemple, des filtres à particules.  The engine 1 comprises a distributor 8a of air intake in the cylinders 8b supplied with fresh air by an intake line 22 and an exhaust manifold 8c which recovers combustion gases and which communicates with an exhaust line 11 provided with a device for post-treatment of gaseous effluents 10. This post-processing device 10 comprises, for example, particulate filters.
La ligne d'admission d'air 22 est équipée d'un filtre à air 2 et d'un débitmètre 3. L'air admis dans le moteur est comprimé par un compresseur 4 d'un turbocompresseur 5. Un refroidisseur de suralimentation air-air 6 est disposé en aval du compresseur 4. La ligne d'admission 22 comprend, également, un volet d'admission 7 placé en amont du répartiteur 8a.  The air intake line 22 is equipped with an air filter 2 and a flow meter 3. The air admitted into the engine is compressed by a compressor 4 of a turbocharger 5. A supercharger air-cooler air 6 is disposed downstream of the compressor 4. The intake line 22 also comprises an intake flap 7 placed upstream of the distributor 8a.
La ligne d'échappement 11 du moteur 1 est équipée d'une turbine 9 du turbocompresseur 5. Cette turbine 9 a pour fonction de détendre les effluents gazeux issus du moteur 1. La ligne d'échappement 11 est, également, équipée d'un volet d'échappement 12.  The exhaust line 11 of the engine 1 is equipped with a turbine 9 of the turbocharger 5. This turbine 9 serves to relax the gaseous effluents from the engine 1. The exhaust line 11 is also equipped with a exhaust flap 12.
Un dispositif de recirculation des gaz d'échappement 13 permet de capter les effluents gazeux en sortie du moteur 1 pour les réinjecter dans le moteur 1 après les avoir mélangés à de l'air frais. Ce dispositif 13 comprend deux circuits, un circuit à basse pression 14, raccordé en sortie du filtre à particules placé à l'aval de la turbine 9 du turbocompresseur 5 et en amont du compresseur 4 du turbocompresseur 5, et un circuit à haute pression 15, raccordé en amont de la turbine 9 du turbocompresseur 5 et en amont d 'un répartiteur d' admission 8a d ' air dans les cylindres 8b du moteur 1 . Ces deux circuits possèdent un conduit 16 commun doté d'un refroidisseur 17. An exhaust gas recirculation device 13 makes it possible to capture the off-gases at the outlet of the engine 1 for reinjecting them into the engine 1 after having mixed them with fresh air. This device 13 comprises two circuits, a low-pressure circuit 14, connected at the outlet of the particulate filter placed downstream of the turbine 9 of the turbocharger 5 and upstream of the compressor 4 of the turbocharger 5, and a high-pressure circuit 15. , connected in upstream of the turbine 9 of the turbocharger 5 and upstream of an intake manifold 8a of air in the cylinders 8b of the engine 1. These two circuits have a common conduit 16 with a cooler 17.
Le circuit à basse pression 14 capte les gaz d' échappement à la sortie d 'un filtre à particules placé en aval de la turbine 9. Les gaz détendus sont refroidis lors de leur passage dans le refroidisseur 1 7. Ils passent ensuite par une vanne 1 8 du circuit de recirculation à basse pression 14, pour venir se mélanger avec l ' air frais et alimenter le compresseur 4.  The low pressure circuit 14 captures the exhaust gas at the outlet of a particulate filter placed downstream of the turbine 9. The expanded gases are cooled as they pass through the cooler 1 7. They then pass through a valve 1 8 of the low pressure recirculation circuit 14, to mix with the fresh air and supply the compressor 4.
Le circuit à haute pression 15 , quant à lui, capte les gaz en amont de la turbine 9. Ces gaz sont également amenés dans le refroidisseur 17. Une vanne trois voies 19 montée au confluent du circuit à haute pression 15 et du circuit à basse pression 14, en amont du refroidisseur 17, permet de sélectionner le flux de gaz d' échappement passant dans le refroidisseur 17. Le circuit à haute pression 15 se poursuit en aval du refroidisseur par un conduit 20 portant les gaz d' échappement au travers d'une vanne 21 du circuit EGR à haute pression jusqu' au répartiteur 8a.  The high-pressure circuit 15, in turn, captures the gases upstream of the turbine 9. These gases are also fed into the cooler 17. A three-way valve 19 mounted at the confluence of the high-pressure circuit 15 and the low-voltage circuit pressure 14, upstream of the cooler 17, makes it possible to select the flow of exhaust gas passing through the cooler 17. The high-pressure circuit 15 continues downstream of the cooler via a conduit 20 carrying the exhaust gases through a valve 21 of the high pressure EGR circuit up to the distributor 8a.
Un tel agencement du dispositif de recirculation permet d' avoir un refroidisseur 17 unique pour les deux circuits à haute et à basse pression 15 et 14. Selon la situation dans laquelle se trouve le véhicule, on choisit d'utiliser l 'un ou l ' autre des circuits.  Such an arrangement of the recirculation device makes it possible to have a single cooler 17 for the two high and low pressure circuits 15 and 14. Depending on the situation in which the vehicle is located, one chooses to use one or the other. other circuits.
Si l'on souhaite effectuer la recirculation des gaz d' échappement via le circuit à haute pression 15 , on oriente la vanne trois voies 19 de manière à faire passer les gaz d' échappement captés en amont de la turbine 9 dans le refroidisseur 17. Les gaz détendus sont, quant à eux, rej etés dans l ' atmosphère, la vanne trois voies 1 9 empêchant leur passage dans le refroidisseur 17. La vanne 1 8 en sortie du refroidisseur 17 est également fermée. Les gaz refroidis sont donc dirigés au travers de la vanne 2 1 ouverte pour alimenter les cylindres 8b du moteur 1 .  If it is desired to carry out the recirculation of the exhaust gases via the high-pressure circuit 15, the three-way valve 19 is oriented so as to pass the exhaust gases collected upstream of the turbine 9 in the cooler 17. The expanded gases are, in turn, released into the atmosphere, the three-way valve 1 9 preventing their passage through the cooler 17. The valve 1 8 at the outlet of the cooler 17 is also closed. The cooled gases are thus directed through the valve 2 1 open to supply the cylinders 8b of the engine 1.
Si l'on souhaite utiliser le circuit à basse pression 14, on oriente la vanne trois voies 19 de manière à autoriser le passage des gaz détendus et empêcher l ' arrivée de gaz captés en amont de la turbine 9. Ces gaz sont introduits dans le refroidisseur 17 en passant par le conduit 16. La vanne 21 est maintenue fermée et la vanne 1 8 est maintenue ouverte . Les gaz de recirculation sont donc mélangés à l ' air frais en amont du compresseur 4. If it is desired to use the low-pressure circuit 14, the three-way valve 19 is oriented so as to allow the passage of the gas expanded and prevent the arrival of gas captured upstream of the turbine 9. These gases are introduced into the cooler 17 through the conduit 16. The valve 21 is kept closed and the valve 1 8 is kept open. The recirculation gases are thus mixed with the fresh air upstream of the compressor 4.
La figure 2 illustre un schéma d'un moteur 1 équipé d 'un dispositif de recirculation des gaz d' échappement 15 selon un autre mode de réalisation. Les éléments communs aux figures 1 et 2 portent les mêmes références. Ce dernier mode de réalisation diffère du premier mode de réalisation en ce que la vanne trois voies 19 est substituée par deux vannes 22 et 23. La vanne 22 est montée sur le circuit à haute pression 15 du dispositif de recirculation 13 en amont du conduit commun 16. De manière analogue, la vanne 23 est montée sur le circuit à basse pression 14 en amont du conduit commun 16.  FIG. 2 illustrates a diagram of a motor 1 equipped with an exhaust gas recirculation device 15 according to another embodiment. The elements common to Figures 1 and 2 have the same references. This latter embodiment differs from the first embodiment in that the three-way valve 19 is substituted by two valves 22 and 23. The valve 22 is mounted on the high pressure circuit 15 of the recirculation device 13 upstream of the common conduit 16. Similarly, the valve 23 is mounted on the low-pressure circuit 14 upstream of the common duct 16.
L ' actionnement conjoint de ces deux vannes 22 et 23 a un effet équivalent à celui produit par l ' actionnement de la vanne trois voies 19 de la figure 1 . Ainsi, pour permettre le passage des gaz détendus dans le refroidisseur, on ouvre la vanne 23 et on clôt la vanne 22. S i au contraire, on souhaite refroidir les gaz captés en amont de la turbine 9, alors on ouvre la vanne 22 et on ferme la vanne 23.  The joint actuation of these two valves 22 and 23 has an effect equivalent to that produced by the actuation of the three-way valve 19 of FIG. Thus, in order to allow the passage of the expanded gases in the cooler, the valve 23 is opened and the valve 22 is closed. On the contrary, it is desired to cool the gases captured upstream of the turbine 9, then the valve 22 is opened and the valve 23 is closed.
L 'invention permet donc un traitement efficace des polluants et assure un fonctionnement optimal du moteur d 'un véhicule automobile, en proposant un dispositif de recirculation des gaz d' échappement possédant deux circuits, le premier à basse pression et le deuxième à haute pression. Ce dispositif a la particularité de posséder un refroidisseur commun aux deux circuits. Ainsi, selon la situation climatique ou en fonction de la température du moteur, les gaz de l 'un ou de l ' autre circuit passent au travers du refroidisseur.  The invention therefore allows an effective treatment of pollutants and ensures optimum operation of the engine of a motor vehicle, by proposing an exhaust gas recirculation device having two circuits, the first at low pressure and the second at high pressure. This device has the particularity of having a cooler common to both circuits. Thus, depending on the climatic situation or as a function of the engine temperature, the gases of one or the other circuit pass through the cooler.
Lorsque le moteur est froid, par exemple en phase de démarrage, on utilise seulement des gaz EGR provenant du circuit EGR haute pression sans passer les gaz dans le refroidisseur. Pour cela, on dispose d'une vanne 25 placée sur un conduit 24 reliant l' amont de la turbine 9 à la branche 1 5 du circuit à haute pression. Dans le cas du premier mo de de réalisation illustré par la figure 1 , on ouvre la vanne 25 et on maintient fermée la vanne 1 9 pendant la phase d'utilisation des gaz EGR haute pression non refroidis . When the engine is cold, for example during the start-up phase, only EGR gas coming from the high-pressure EGR circuit is used without passing the gases into the cooler. For this, there is a valve 25 placed on a pipe 24 connecting the upstream of the turbine 9 to the branch 1 5 of the high pressure circuit. In the case of the first embodiment illustrated in FIG. 1, the valve 25 is opened and the valve 1 9 is kept closed during the use phase of the uncooled high pressure EGR gases.
Dans le cas du deuxième mode de réalisation illustré par la figure 2, on ouvre la vanne 25 et on maintient fermées les vannes 22 et 23 pendant la phase d'utilisation des gaz EGR haute pression non refroidis .  In the case of the second embodiment illustrated in FIG. 2, the valve 25 is opened and the valves 22 and 23 are kept closed during the use phase of the uncooled high-pressure EGR gases.

Claims

REVENDICATIONS
1 . Dispositif de recirculation des gaz d' échappement pour moteur ( 1 ) à combustion interne équipé d'un turbocompresseur (5) de suralimentation du moteur et d'un dispositif ( 10) de post-traitement des effluents gazeux du moteur comprenant un premier circuit de recirculation des gaz d' échappement, raccordé à la sortie d'un filtre à particules placé en aval de la turbine du turbocompresseur et en amont du compresseur du turbocompresseur, et un deuxième circuit de recirculation des gaz d' échappement, raccordé en amont de la turbine du turbocompresseur et en amont d'un répartiteur d' admission d ' air dans les cylindres du moteur, le premier et le deuxième circuits de recirculation des gaz d' échappement comportant un conduit ( 16) commun doté d'un refroidisseur ( 17), caractérisé en ce qu' il comprend un conduit (24) reliant l ' amont de la turbine (9) au deuxième circuit de recirculation des gaz d' échappement, ledit conduit (24) comprenant une vanne (25) permettant aux gaz d' échappement de circuler vers le répartiteur (8a) d' admission en contournant le refroidisseur ( 17) . 1. Exhaust gas recirculation device for an internal combustion engine (1) equipped with a turbocharger (5) for charging the engine and a device (10) for post-treatment of the exhaust gases of the engine, comprising a first fuel circuit exhaust gas recirculation, connected to the outlet of a particulate filter downstream of the turbocharger turbine and upstream of the turbocharger compressor, and a second exhaust gas recirculation circuit connected upstream of the turbocharger, turbocharger turbine and upstream of an air intake manifold in the engine cylinders, the first and second exhaust gas recirculation circuits having a common duct (16) with a cooler (17) , characterized in that it comprises a duct (24) connecting the upstream of the turbine (9) to the second exhaust gas recirculation circuit, said duct (24) comprising a valve (25) allowing exhaust gas flow to the inlet distributor (8a) bypassing the cooler (17).
2. Dispositif de recirculation des gaz d' échappement selon la revendication 1 , comportant des vannes aptes à diriger de manière sélective les gaz du premier circuit de recirculation ou les gaz du deuxième circuit de recirculation dans le refroidisseur ( 17) .  2. Exhaust gas recirculation device according to claim 1, comprising valves adapted to selectively direct the gases of the first recirculation circuit or the gases of the second recirculation circuit in the cooler (17).
3. Dispositif de recirculation des gaz d' échappement selon la revendication 2, dans lequel, parmi les vannes, on compte au moins une vanne trois voies ( 19) .  3. Exhaust gas recirculation device according to claim 2, wherein, among the valves, there is at least one three-way valve (19).
4. Moteur de véhicule automobile comprenant un dispositif de recirculation des gaz d' échappement selon l'une quelconque des revendications 1 à 3.  Motor vehicle engine comprising an exhaust gas recirculation device according to any of claims 1 to 3.
5. Procédé de pilotage d'un circuit de recirculation des gaz d' échappement selon l 'une quelconque des revendications 2 à 4, dans lequel on commande des vannes pour diriger de manière sélective les gaz du premier circuit de recirculation ou les gaz du deuxième circuit de recirculation dans le refroidisseur.  5. A method of controlling an exhaust gas recirculation circuit according to any one of claims 2 to 4, wherein valves are controlled to selectively direct the gases of the first recirculation circuit or the gases of the second. recirculation circuit in the cooler.
PCT/FR2015/053409 2014-12-22 2015-12-10 Device for recirculating exhaust gases for a motor vehicle internal combustion engine WO2016102798A1 (en)

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US10415513B2 (en) * 2015-05-26 2019-09-17 Tenneco Gmbh EGR system with particle filter and wastegate
US10502166B2 (en) 2015-05-26 2019-12-10 Tenneco Gmbh EGR system with particle filter and wastegate
DE102017119537A1 (en) * 2017-08-25 2019-02-28 Tenneco Gmbh exhaust gas control system
DE102017119537B4 (en) * 2017-08-25 2020-12-10 Tenneco Gmbh Exhaust gas control system

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EP3237742A1 (en) 2017-11-01
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