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EP3217006B1 - Combustion engine with system for recirculation of exhaust gases - Google Patents

Combustion engine with system for recirculation of exhaust gases Download PDF

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Publication number
EP3217006B1
EP3217006B1 EP17157854.5A EP17157854A EP3217006B1 EP 3217006 B1 EP3217006 B1 EP 3217006B1 EP 17157854 A EP17157854 A EP 17157854A EP 3217006 B1 EP3217006 B1 EP 3217006B1
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EP
European Patent Office
Prior art keywords
short
circuit
exchanger
exhaust gases
engine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17157854.5A
Other languages
German (de)
French (fr)
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EP3217006A1 (en
Inventor
Didier Girard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PSA Automobiles SA
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PSA Automobiles SA
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Publication date
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Publication of EP3217006A1 publication Critical patent/EP3217006A1/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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • 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
    • F02M26/23—Layout, e.g. schematics
    • F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
    • 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
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • F28D7/1684—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation the conduits having a non-circular cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/16—Outlet manifold
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/06—Derivation channels, e.g. bypass

Definitions

  • the present invention relates to a heat engine with exhaust gas recirculation system.
  • the invention finds a particularly advantageous application in the field of motor vehicles.
  • combustion chambers In an internal combustion engine, the four stages of the thermodynamic cycle - admission of fuel gas and air, compression of the gas mixture, expansion due to the explosion of the mixture, exhaust - take place successively in enclosures of the cylinders of the combustion engine , called combustion chambers.
  • the gases introduced into these combustion chambers consist on the one hand of air and on the other hand of gasoline or gas oil, in proportions proportionally dosed according to the engines and ignition systems used. The gas mixture is then ignited in the combustion chamber.
  • the exhaust gases from internal combustion engines in most motor vehicles contain a number of pollutants that are expected to reduce releases to the atmosphere (including nitrogen oxides, carbon monoxide, unburned hydrocarbons , particles and carbon dioxide).
  • pollutants including nitrogen oxides, carbon monoxide, unburned hydrocarbons , particles and carbon dioxide.
  • the regulations applicable to pollution by motor vehicles regularly lower the limits of acceptable discharges.
  • EGR exhaust Gas Recirculation
  • This EGR type system comprises a heat exchanger, said EGR exchanger, comprising a cooling device formed by a set of tubes in which are able to circulate the exhaust gas, and an exhaust gas bypass line allowing the gases to short circuit the cooling device.
  • An EGR valve is used to manage the amount of exhaust gas re-injected at the intake.
  • a shutter allows to manage the amount of exhaust gas circulating in the cooling device and the amount of gas passing through the bypass pipe.
  • integrated is meant that the short-circuit conductor is integral with the body of the exchanger, so that the short-circuit conduit and the body of the exchanger form a single piece.
  • the invention thus makes it possible, by integrating the short-circuit conductor with the body of the exchanger, to reduce the bulk and to simplify the assembly of the short-circuit function of the heat engine radiator during a rising phase. in temperature of the latter.
  • the exchanger and the short-circuit conduit have a common wall.
  • a coolant outlet of the exchanger is constituted by a through opening made in the common wall and opening into the short-circuit conduit. Due to the recovery of the liquid heated by the exhaust gas, such a configuration accelerates the rise in temperature of the engine.
  • the system further comprises a valve adapted to manage a quantity of exhaust gas passing through the exchanger.
  • valve is associated with a coolant inlet and a coolant outlet connected to the short-circuit conduit via a stitching.
  • the system comprises a control device comprising an electric motor associated with a flap carried by an axis rotatably mounted relative to the body, the flap being able to direct, according to its angular positioning, the exhaust gases towards the pipe diverting the exhaust gas or to the cooling device.
  • the invention also relates to a vehicle, especially a motor vehicle, comprising the engine according to any one of the variants described above.
  • the figure 1 is a schematic representation of a thermal engine architecture equipped with the exhaust gas recirculation system according to the present invention
  • the figure 2 is a perspective view of the exhaust gas recirculation system according to the present invention.
  • FIG 3 is a cross-sectional view of the exchanger according to the present invention and the associated short circuit conduit in which circulates the coolant bypassing the heat engine radiator;
  • the figure 4 is a perspective view in section of the exhaust gas recirculation system according to the present invention illustrating the communication between the short circuit conduit and the inside of the volume of the exchanger;
  • the figure 5 is a perspective view of the exhaust gas recirculation system according to the present invention without the body of the exchanger;
  • FIGS. 6a and 6b are cross-sectional views of the exchanger and the short-circuit conduit according to the present invention respectively illustrating the positioning of an inlet and a coolant outlet of the exchanger.
  • the figure 1 shows an architecture 1 comprising an internal combustion engine 5 supercharged by a turbocharger 2 comprising a compressor 3 and a turbine 4.
  • the compressor 3 compresses the intake air so as to optimize the filling of the engine cylinders 5.
  • the compressor 3 is disposed on an intake pipe 8 upstream of the engine 5.
  • the flow of the exhaust gas rotates the turbine 4 disposed on an exhaust pipe 9, which then drives in rotation the compressor 3 via a coupling shaft.
  • a turbocharger control valve 2 located upstream of the turbine 4 makes it possible to manage the quantity of exhaust gas flowing through the turbine 4 and the quantity of gas passing through a discharge pipe 16.
  • a heat exchanger 10 known as RAS (for a cooling air chiller) is used to cool the air circulating in the intake duct 8.
  • RAS for a cooling air chiller
  • the exchanger 10 is mounted downstream of the compressor 3 and upstream of an air metering device 18.
  • an exhaust gas recirculation system 23 (called “EGR” for “Exhaust Gas Recirculation” in English) establishes a communication of an exhaust manifold 20 with the intake pipe 8, and a heat exchanger 14, said exchanger EGR, exhaust gas.
  • An EGR valve 25 makes it possible to manage the quantity of exhaust gas reinjected at the inlet.
  • a flap 12 associated with an electric actuator 19 is adapted to manage the amount of exhaust gas flowing in a cooling device 34 and in a branch line 21, as is described in more detail below.
  • the EGR exchanger 14 comprises a body 13 provided at its ends with an input interface 30 in communication with the exhaust manifold 20 of the motor vehicle via the EGR valve 25 and an output interface 31 in communication with the intake pipe 8 of the heat engine 5.
  • the valve 25 is associated with a coolant inlet 32 and a coolant outlet 33 connected to the short-circuit conduit 38 via a stitching 42.
  • the body 13 of the exchanger 14 defines a volume filled with coolant.
  • the body 13 contains a cooling device 34 formed by a set of tubes 35 in which are able to circulate the exhaust gas.
  • the body 13 also contains the bypass line 21 of the exhaust gases allowing the gas to bypass the cooling device 34.
  • the system 23 furthermore comprises a short-circuiting line 38 short-circuiting a radiator 17 of the heat engine 5. Indeed, during a start of the heat engine 5, the line 38 bypasses the radiator 17 of the heat engine 5 until the engine 5 reaches its operating temperature. Thus, as long as this temperature is not reached, a thermostat 19 remains closed so that the coolant flows through the short-circuit conduit 38 to loop directly to a water pump 22 located on the accessory facade of the vehicle . Once the operating temperature is reached, the thermostat 19 is opened to allow circulation of the coolant inside the radiator 17.
  • the short-circuiting line 38 is integrated in the body 13 of the exchanger 14.
  • integrated is meant that the short-circuit line 38 is in one piece with the body 13 of the exchanger 14, so that that the short-circuit conduit 38 and the body 13 of the exchanger 14 form a single piece.
  • the short-circuit conduit 38 and the body 13 of the exchanger 14 may be made of the same material. The assembly can then be easily obtained by molding for example.
  • the short-circuit conduit 38 is made of a material different from that of the body 13 of the exchanger 14.
  • the body 13 and the short-circuit conduit 38 may be made of metal and / or a plastic material , the choice of material depending on the application.
  • the exchanger 14 and the short-circuit conduit 38 have a common wall 39, which makes it possible to minimize the bulk of the assembly.
  • the exchanger 14 is supplied with cooling liquid via a liquid inlet 36 which is clearly visible on the figure 6a .
  • the outlet 37 of coolant is constituted by a through opening made in the common wall 39 and opening into the short-circuit conduit 38, as is clearly visible on the figures 4 and 6b . This establishes a fluid communication between the internal volume of the exchanger 14 and the short-circuit conduit 38. Due to the recovery of the liquid heated by the exhaust gas in the short-circuit conduit 38, such a configuration accelerates the temperature rise of the heat engine 5.
  • the system 23 also comprises a control device 24 comprising an electric motor 6 associated with the flap 12.
  • the flap 12 is carried by an axis 40 rotatably mounted relative to the body 13 and is able to direct, according to its angular positioning, the gases exhaust to the bypass line 21 of the exhaust gas or to the cooling device 34.
  • the short-circuit line 38 is further connected to a manifold 43 via a pipe 44.
  • the short-circuit line 38 comprises at each of its ends a connection interface 46 with a pipe 44 corresponding flexible.
  • the invention thus makes it possible, by integrating the short-circuit conduit 38 to the body 13 of the exchanger 14, to reduce the bulk and to simplify the assembly of the short-circuit function of the radiator 17 of the heat engine 5 during a phase of temperature rise of the latter.

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

Description

La présente invention porte sur un moteur thermique à système de recirculation des gaz d'échappement. L'invention trouve une application particulièrement avantageuse dans le domaine des véhicules automobiles.The present invention relates to a heat engine with exhaust gas recirculation system. The invention finds a particularly advantageous application in the field of motor vehicles.

Dans un moteur à combustion interne, les quatre temps du cycle thermodynamique - admission de gaz combustible et d'air, compression du mélange gazeux, détente due à l'explosion du mélange, échappement - se déroulent successivement dans des enceintes des cylindres du moteur thermique, dites chambres de combustion. Les gaz introduits dans ces chambres de combustion sont constitués d'une part d'air et d'autre part d'essence ou de gasoil, selon des proportions dosées de manière adéquate suivant les moteurs et les systèmes d'allumage utilisés. Le mélange gazeux est alors enflammé dans la chambre de combustion.In an internal combustion engine, the four stages of the thermodynamic cycle - admission of fuel gas and air, compression of the gas mixture, expansion due to the explosion of the mixture, exhaust - take place successively in enclosures of the cylinders of the combustion engine , called combustion chambers. The gases introduced into these combustion chambers consist on the one hand of air and on the other hand of gasoline or gas oil, in proportions proportionally dosed according to the engines and ignition systems used. The gas mixture is then ignited in the combustion chamber.

Les gaz d'échappement des moteurs à combustion interne équipant la plupart des véhicules automobiles contiennent un certain nombre de polluants dont il est souhaitable de réduire les rejets dans l'atmosphère (notamment des oxydes d'azote, du monoxyde de carbone, des hydrocarbures imbrûlés, des particules et du dioxyde de carbone). Les réglementations applicables en matière de pollution par des véhicules automobiles abaissent régulièrement les plafonds de rejets acceptables.The exhaust gases from internal combustion engines in most motor vehicles contain a number of pollutants that are expected to reduce releases to the atmosphere (including nitrogen oxides, carbon monoxide, unburned hydrocarbons , particles and carbon dioxide). The regulations applicable to pollution by motor vehicles regularly lower the limits of acceptable discharges.

Une grande partie des polluants générés par un moteur à combustion interne est due à une combustion incomplète du carburant. Pour réduire les rejets polluants pénétrant dans la ligne d'échappement, il est connu d'utiliser un système dit EGR (acronyme pour "Exhaust Gas Recirculation") permettant de faire re-circuler une partie des gaz d'échappement vers la conduite d'admission du moteur thermique.A large part of the pollutants generated by an internal combustion engine is due to incomplete combustion of the fuel. To reduce the pollutant discharges entering the exhaust line, it is known to use an EGR (acronym for "Exhaust Gas Recirculation") to recirculate a portion of the exhaust gas to the pipe of intake of the engine.

Ce système de type EGR, connu par exemple du document US20090188477 , comporte un échangeur de chaleur, dit échangeur EGR, comportant un dispositif de refroidissement formé par un ensemble de tubes dans lesquels sont aptes à circuler les gaz d'échappement, ainsi qu'une conduite de dérivation des gaz d'échappement permettant aux gaz de court-circuiter le dispositif de refroidissement. Une vanne d'EGR permet de gérer la quantité de gaz d'échappement réinjecté à l'admission. En outre, un volet permet de gérer la quantité de gaz d'échappement circulant dans le dispositif de refroidissement et la quantité de gaz passant par la conduite de dérivation.This EGR type system, known for example from the document US20090188477 , comprises a heat exchanger, said EGR exchanger, comprising a cooling device formed by a set of tubes in which are able to circulate the exhaust gas, and an exhaust gas bypass line allowing the gases to short circuit the cooling device. An EGR valve is used to manage the amount of exhaust gas re-injected at the intake. In addition, a shutter allows to manage the amount of exhaust gas circulating in the cooling device and the amount of gas passing through the bypass pipe.

L'invention vise à optimiser la configuration d'un tel système en proposant un moteur thermique comprenant :

  • un circuit de refroidissement par liquide équipé d'un radiateur de refroidissement, ce circuit comprenant une conduite destinée au court-circuit du radiateur lorsque le moteur thermique n'a pas atteint sa température de fonctionnement,
  • un système de recirculation des gaz d'échappement d'un moteur thermique comportant :
    • un échangeur de chaleur, dit échangeur EGR, comportant un corps contenant:
      • un dispositif de refroidissement formé par un ensemble de tubes dans lesquels sont aptes à circuler lesdits gaz d'échappement, et
      • une conduite de dérivation des gaz d'échappement permettant aux gaz de court-circuiter ledit dispositif de refroidissement,
    • caractérisé en ce que la conduite de court-circuit est intégrée audit corps de l'échangeur.
The invention aims at optimizing the configuration of such a system by proposing a heat engine comprising:
  • a liquid cooling circuit equipped with a cooling radiator, this circuit comprising a pipe intended for the short circuit of the radiator when the heat engine has not reached its operating temperature,
  • an exhaust gas recirculation system of a heat engine comprising:
    • a heat exchanger, said EGR exchanger, comprising a body containing:
      • a cooling device formed by a set of tubes in which said exhaust gases are able to circulate, and
      • an exhaust gas bypass line allowing the gases to bypass said cooling device,
    • characterized in that the short circuit conduit is integrated with said body of the exchanger.

Par "intégrée", on entend le fait que la conduite de court-circuit est monobloc avec le corps de l'échangeur, en sorte que la conduite de court-circuit et le corps de l'échangeur forment une seule et même pièce.By "integrated" is meant that the short-circuit conductor is integral with the body of the exchanger, so that the short-circuit conduit and the body of the exchanger form a single piece.

L'invention permet ainsi, en intégrant la conduite de court-circuit au corps de l'échangeur, de réduire l'encombrement et de simplifier le montage de la fonction de court-circuit du radiateur du moteur thermique lors d'une phase de montée en température de ce dernier.The invention thus makes it possible, by integrating the short-circuit conductor with the body of the exchanger, to reduce the bulk and to simplify the assembly of the short-circuit function of the heat engine radiator during a rising phase. in temperature of the latter.

Selon une réalisation, l'échangeur et la conduite de court-circuit ont une paroi commune.In one embodiment, the exchanger and the short-circuit conduit have a common wall.

Selon une réalisation, une sortie de liquide de refroidissement de l'échangeur est constituée par une ouverture traversante réalisée dans la paroi commune et débouchant dans la conduite de court-circuit. Du fait de la récupération du liquide réchauffé par les gaz d'échappement, une telle configuration permet d'accélérer la montée en température du moteur thermique.According to one embodiment, a coolant outlet of the exchanger is constituted by a through opening made in the common wall and opening into the short-circuit conduit. Due to the recovery of the liquid heated by the exhaust gas, such a configuration accelerates the rise in temperature of the engine.

Selon une réalisation, le système comporte en outre une vanne apte à gérer une quantité de gaz d'échappement passant à travers l'échangeur.According to one embodiment, the system further comprises a valve adapted to manage a quantity of exhaust gas passing through the exchanger.

Selon une réalisation, la vanne est associée à une entrée de liquide de refroidissement et à une sortie de liquide de refroidissement connectée à la conduite de court-circuit via un piquage.In one embodiment, the valve is associated with a coolant inlet and a coolant outlet connected to the short-circuit conduit via a stitching.

Selon une réalisation, le système comporte un dispositif de commande comprenant un moteur électrique associé à un volet porté par un axe monté rotatif par rapport au corps, le volet étant apte à diriger, suivant son positionnement angulaire, les gaz d'échappement vers la conduite de dérivation des gaz d'échappement ou vers le dispositif de refroidissement.According to one embodiment, the system comprises a control device comprising an electric motor associated with a flap carried by an axis rotatably mounted relative to the body, the flap being able to direct, according to its angular positioning, the exhaust gases towards the pipe diverting the exhaust gas or to the cooling device.

L'invention a également pour objet un véhicule, notamment véhicule automobile, comportant le moteur selon l'une quelconque des variantes décrites plus haut.The invention also relates to a vehicle, especially a motor vehicle, comprising the engine according to any one of the variants described above.

L'invention sera mieux comprise à la lecture de la description qui suit et à l'examen des figures qui l'accompagnent. Ces figures ne sont données qu'à titre illustratif mais nullement limitatif de l'invention.The invention will be better understood on reading the description which follows and on examining the figures which accompany it. These figures are given for illustrative but not limiting of the invention.

La figure 1 est une représentation schématique d'une architecture de moteur thermique équipée du système de recirculation des gaz d'échappement selon la présente invention;The figure 1 is a schematic representation of a thermal engine architecture equipped with the exhaust gas recirculation system according to the present invention;

La figure 2 est une vue en perspective du système de recirculation des gaz d'échappement selon la présente invention;The figure 2 is a perspective view of the exhaust gas recirculation system according to the present invention;

La figure 3 est une vue en coupe transversale de l'échangeur selon la présente invention et de la conduite de court-circuit associée dans laquelle circule le liquide de refroidissement court-circuitant le radiateur du moteur thermique;The figure 3 is a cross-sectional view of the exchanger according to the present invention and the associated short circuit conduit in which circulates the coolant bypassing the heat engine radiator;

La figure 4 est une vue en perspective et en coupe du système de recirculation des gaz d'échappement selon la présente invention illustrant la communication entre la conduite de court-circuit et l'intérieur du volume de l'échangeur;The figure 4 is a perspective view in section of the exhaust gas recirculation system according to the present invention illustrating the communication between the short circuit conduit and the inside of the volume of the exchanger;

La figure 5 est une vue en perspective du système de recirculation des gaz d'échappement selon la présente invention sans le corps de l'échangeur;The figure 5 is a perspective view of the exhaust gas recirculation system according to the present invention without the body of the exchanger;

Les figures 6a et 6b sont des vues en coupe transversales de l'échangeur et de la conduite de court-circuit selon la présente invention illustrant respectivement le positionnement d'une entrée et d'une sortie de liquide de refroidissement de l'échangeur.The Figures 6a and 6b are cross-sectional views of the exchanger and the short-circuit conduit according to the present invention respectively illustrating the positioning of an inlet and a coolant outlet of the exchanger.

Les éléments identiques, similaires, ou analogues conservent la même référence d'une figure à l'autre.Identical, similar or similar elements retain the same reference from one figure to another.

La figure 1 montre une architecture 1 comportant un moteur à combustion interne 5 suralimenté par un turbocompresseur 2 comprenant un compresseur 3 et une turbine 4. Le compresseur 3 permet de comprimer l'air d'admission de manière à optimiser le remplissage des cylindres du moteur 5. A cet effet, le compresseur 3 est disposé sur une conduite d'admission 8 en amont du moteur 5. L'écoulement des gaz d'échappement entraîne en rotation la turbine 4 disposée sur une conduite d'échappement 9, laquelle entraîne alors en rotation le compresseur 3 par l'intermédiaire d'un arbre d'accouplement. Une vanne 15 de commande de turbocompresseur 2 située en amont de la turbine 4 permet de gérer la quantité de gaz d'échappement circulant à travers la turbine 4 et la quantité de gaz passant par une conduite de décharge 16.The figure 1 shows an architecture 1 comprising an internal combustion engine 5 supercharged by a turbocharger 2 comprising a compressor 3 and a turbine 4. The compressor 3 compresses the intake air so as to optimize the filling of the engine cylinders 5. A this effect, the compressor 3 is disposed on an intake pipe 8 upstream of the engine 5. The flow of the exhaust gas rotates the turbine 4 disposed on an exhaust pipe 9, which then drives in rotation the compressor 3 via a coupling shaft. A turbocharger control valve 2 located upstream of the turbine 4 makes it possible to manage the quantity of exhaust gas flowing through the turbine 4 and the quantity of gas passing through a discharge pipe 16.

De manière à maintenir la densité de l'air acquise en sortie du compresseur 3, on utilise un échangeur de chaleur 10 dit RAS (pour Refroidisseur d'Air de Suralimentation) apte à refroidir l'air circulant dans la conduite d'admission 8. L'échangeur 10 est monté en aval du compresseur 3 et en amont d'un doseur d'air 18.In order to maintain the density of the air acquired at the outlet of the compressor 3, a heat exchanger 10 known as RAS (for a cooling air chiller) is used to cool the air circulating in the intake duct 8. The exchanger 10 is mounted downstream of the compressor 3 and upstream of an air metering device 18.

Par ailleurs, un système 23 de recirculation des gaz d'échappement (dit "EGR" pour "Exhaust Gaz Recirculation" en anglais) établit une mise en communication d'un collecteur d'échappement 20 avec la conduite d'admission 8, et un échangeur de chaleur 14, dit échangeur EGR, des gaz d'échappement. Une vanne d'EGR 25 permet de gérer la quantité de gaz d'échappement réinjectée à l'admission. En outre, un volet 12 associé à un actionneur électrique 19 est apte à gérer la quantité de gaz d'échappement circulant dans un dispositif de refroidissement 34 et dans une conduite de dérivation 21, comme cela est décrit plus en détails ci-après.Furthermore, an exhaust gas recirculation system 23 (called "EGR" for "Exhaust Gas Recirculation" in English) establishes a communication of an exhaust manifold 20 with the intake pipe 8, and a heat exchanger 14, said exchanger EGR, exhaust gas. An EGR valve 25 makes it possible to manage the quantity of exhaust gas reinjected at the inlet. In addition, a flap 12 associated with an electric actuator 19 is adapted to manage the amount of exhaust gas flowing in a cooling device 34 and in a branch line 21, as is described in more detail below.

Ainsi, une partie des gaz d'échappement du moteur thermique 5 est rejetée vers l'extérieur du véhicule automobile à travers la conduite d'échappement 9 et une autre partie des gaz est recyclée. La quantité de gaz devant être remise en circulation est contrôlée par la vanne d'EGR 25, qui dans des circonstances déterminées peut être fermée et ne rien laisser re-circuler, par exemple dans le cas d'une situation de puissance maximale du moteur thermique 5.Thus, a portion of the exhaust gas of the heat engine 5 is released to the outside of the motor vehicle through the exhaust pipe 9 and another part of the gas is recycled. The quantity of gas to be recirculated is controlled by the EGR valve 25, which under given circumstances can be closed and leave nothing to re-circulate, for example in the case of a situation of maximum power of the engine 5.

Plus précisément, comme cela est représenté sur la figure 2, l'échangeur EGR 14 comporte un corps 13 muni à ses extrémités d'une interface d'entrée 30 en communication avec le collecteur d'échappement 20 du véhicule automobile via la vanne d'EGR 25 ainsi que d'une interface de sortie 31 en communication avec la conduite d'admission 8 du moteur thermique 5. Afin d'assurer son refroidissement, la vanne 25 est associée à une entrée 32 de liquide de refroidissement et à une sortie 33 de liquide de refroidissement connectée à la conduite de court-circuit 38 via un piquage 42.More specifically, as shown on the figure 2 , the EGR exchanger 14 comprises a body 13 provided at its ends with an input interface 30 in communication with the exhaust manifold 20 of the motor vehicle via the EGR valve 25 and an output interface 31 in communication with the intake pipe 8 of the heat engine 5. In order to ensure its cooling, the valve 25 is associated with a coolant inlet 32 and a coolant outlet 33 connected to the short-circuit conduit 38 via a stitching 42.

Comme on peut le voir clairement sur les figures 3, 4, 6a et 6b, le corps 13 de l'échangeur 14 délimite un volume rempli de liquide de refroidissement. Le corps 13 contient un dispositif de refroidissement 34 formé par un ensemble de tubes 35 dans lesquels sont aptes à circuler les gaz d'échappement. Le corps 13 contient également la conduite de dérivation 21 des gaz d'échappement permettant aux gaz de court-circuiter le dispositif de refroidissement 34.As can be seen clearly from the Figures 3, 4 , 6a and 6b , the body 13 of the exchanger 14 defines a volume filled with coolant. The body 13 contains a cooling device 34 formed by a set of tubes 35 in which are able to circulate the exhaust gas. The body 13 also contains the bypass line 21 of the exhaust gases allowing the gas to bypass the cooling device 34.

Le système 23 comporte en outre une conduite de court-circuit 38 court-circuitant un radiateur 17 du moteur thermique 5. En effet, lors d'un démarrage du moteur thermique 5, la conduite 38 court-circuite le radiateur 17 du moteur thermique 5 jusqu'à ce que le moteur thermique 5 atteigne sa température de fonctionnement. Ainsi, tant que cette température n'est pas atteinte, un thermostat 19 reste fermé de telle façon que le liquide de refroidissement circule à travers la conduite de court-circuit 38 pour reboucler directement vers une pompe à eau 22 située en façade accessoire du véhicule. Une fois la température de fonctionnement atteinte, le thermostat 19 est ouvert pour autoriser une circulation du liquide de refroidissement à l'intérieur du radiateur 17.The system 23 furthermore comprises a short-circuiting line 38 short-circuiting a radiator 17 of the heat engine 5. Indeed, during a start of the heat engine 5, the line 38 bypasses the radiator 17 of the heat engine 5 until the engine 5 reaches its operating temperature. Thus, as long as this temperature is not reached, a thermostat 19 remains closed so that the coolant flows through the short-circuit conduit 38 to loop directly to a water pump 22 located on the accessory facade of the vehicle . Once the operating temperature is reached, the thermostat 19 is opened to allow circulation of the coolant inside the radiator 17.

Comme cela est bien visible sur les figures 3 et 4, la conduite de court-circuit 38 est intégrée au corps 13 de l'échangeur 14. Par "intégrée", on entend le fait que la conduite de court-circuit 38 est monobloc avec le corps 13 de l'échangeur 14, en sorte que la conduite de court-circuit 38 et le corps 13 de l'échangeur 14 forment une seule et même pièce. La conduite de court-circuit 38 et le corps 13 de l'échangeur 14 pourront être réalisés dans la même matière. L'ensemble pourra alors être obtenu aisément par moulage par exemple. En variante, la conduite de court-circuit 38 est réalisée dans une matière différente de celle du corps 13 de l'échangeur 14. Le corps 13 et la conduite de court-circuit 38 pourront être réalisés en métal et/ou dans un matériau plastique, le choix du matériau dépendant de l'application. De préférence, l'échangeur 14 et la conduite de court-circuit 38 ont une paroi commune 39, ce qui permet de minimiser l'encombrement de l'ensemble.As is clearly visible on the Figures 3 and 4 , the short-circuiting line 38 is integrated in the body 13 of the exchanger 14. By "integrated" is meant that the short-circuit line 38 is in one piece with the body 13 of the exchanger 14, so that that the short-circuit conduit 38 and the body 13 of the exchanger 14 form a single piece. The short-circuit conduit 38 and the body 13 of the exchanger 14 may be made of the same material. The assembly can then be easily obtained by molding for example. Alternatively, the short-circuit conduit 38 is made of a material different from that of the body 13 of the exchanger 14. The body 13 and the short-circuit conduit 38 may be made of metal and / or a plastic material , the choice of material depending on the application. Preferably, the exchanger 14 and the short-circuit conduit 38 have a common wall 39, which makes it possible to minimize the bulk of the assembly.

L'échangeur 14 est alimenté en liquide de refroidissement via une entrée 36 de liquide bien visible sur la figure 6a. La sortie 37 de liquide de refroidissement est constituée par une ouverture traversante réalisée dans la paroi commune 39 et débouchant dans la conduite de court-circuit 38, comme cela est bien visible sur les figures 4 et 6b. On établit ainsi une communication fluidique entre le volume interne de l'échangeur 14 et la conduite de court-circuit 38. Du fait de la récupération du liquide réchauffé par les gaz d'échappement dans la conduite de court-circuit 38, une telle configuration permet d'accélérer la montée en température du moteur thermique 5.The exchanger 14 is supplied with cooling liquid via a liquid inlet 36 which is clearly visible on the figure 6a . The outlet 37 of coolant is constituted by a through opening made in the common wall 39 and opening into the short-circuit conduit 38, as is clearly visible on the figures 4 and 6b . This establishes a fluid communication between the internal volume of the exchanger 14 and the short-circuit conduit 38. Due to the recovery of the liquid heated by the exhaust gas in the short-circuit conduit 38, such a configuration accelerates the temperature rise of the heat engine 5.

Comme cela est représenté sur les figures 4 et 5, le système 23 comporte également un dispositif de commande 24 comprenant un moteur électrique 6 associé au volet 12. Le volet 12 est porté par un axe 40 monté rotatif par rapport au corps 13 et est apte à diriger, suivant son positionnement angulaire, les gaz d'échappement vers la conduite de dérivation 21 des gaz d'échappement ou vers le dispositif de refroidissement 34.As shown on the figures 4 and 5 , the system 23 also comprises a control device 24 comprising an electric motor 6 associated with the flap 12. The flap 12 is carried by an axis 40 rotatably mounted relative to the body 13 and is able to direct, according to its angular positioning, the gases exhaust to the bypass line 21 of the exhaust gas or to the cooling device 34.

La conduite de court-circuit 38 est en outre connectée à un collecteur 43 par l'intermédiaire d'un tuyau 44. A cet effet, la conduite de court-circuit 38 comprend à chacune de ses extrémités une interface de connexion 46 avec un tuyau 44 souple correspondant.The short-circuit line 38 is further connected to a manifold 43 via a pipe 44. For this purpose, the short-circuit line 38 comprises at each of its ends a connection interface 46 with a pipe 44 corresponding flexible.

L'invention permet ainsi, en intégrant la conduite de court-circuit 38 au corps 13 de l'échangeur 14, de réduire l'encombrement et de simplifier le montage de la fonction de court-circuit du radiateur 17 du moteur thermique 5 lors d'une phase de montée en température de ce dernier.The invention thus makes it possible, by integrating the short-circuit conduit 38 to the body 13 of the exchanger 14, to reduce the bulk and to simplify the assembly of the short-circuit function of the radiator 17 of the heat engine 5 during a phase of temperature rise of the latter.

Claims (7)

  1. A combustion engine (5) including:
    - a circuit for cooling by liquid equipped with a cooling radiator (17), this circuit including a duct (38) intended for the short-circuit of the radiator (17) when the combustion engine has not reached it operating temperature,
    - a system (23) for the recirculation of the exhaust gases of the combustion engine (5) comprising:
    a heat exchanger (14), designated an EGR exchanger, comprising a body (13) containing:
    - a cooling device (34) formed by a set of tubes (35) in which said exhaust gases are able to circulate, and
    - a bypass duct (21) of the exhaust gases permitting the gases to short-circuit said cooling device (34),
    characterized in that the short-circuit duct (38) is integrated to said body (13) of the exchanger (14).
  2. The engine according to claim 1, characterized in that said exchanger (14) and said short-circuit duct (38) have a shared wall (39).
  3. The engine according to claim 2, characterized in that an outlet (37) of cooling liquid from said exchanger (14) is constituted by a transverse opening formed in the shared wall (39) and opening out in said short-circuit duct (38).
  4. The engine according to any one of claims 1 to 3, characterized in that the system (23) further comprises a valve (25) able to control a quantity of exhaust gas passing through said exchanger (14).
  5. The engine according to claim 4, characterized in that said valve (25) is associated with an inlet (32) of cooling liquid and with an outlet (33) of cooling liquid connected to said short-circuit duct (38) via a pick-off (42).
  6. The engine according to any one of claims 1 to 5, characterized in that said system (23) comprises a control device (24) including an electric motor (6) associated with a flap (12) carried by an axis (40) mounted rotatably with respect to the body (13), said flap (12) being able to direct, according to its angular positioning, the exhaust gases towards said bypass duct (21) of the exhaust gases or towards said cooling device (34).
  7. A vehicle, in particular a motor vehicle, comprising the engine (5) according to any one of the preceding claims.
EP17157854.5A 2016-03-09 2017-02-24 Combustion engine with system for recirculation of exhaust gases Active EP3217006B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1651960A FR3048731B1 (en) 2016-03-09 2016-03-09 EXHAUST GAS RECIRCULATION SYSTEM OF A HEAT ENGINE

Publications (2)

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EP3217006A1 EP3217006A1 (en) 2017-09-13
EP3217006B1 true EP3217006B1 (en) 2018-10-24

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EP17157854.5A Active EP3217006B1 (en) 2016-03-09 2017-02-24 Combustion engine with system for recirculation of exhaust gases

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EP (1) EP3217006B1 (en)
FR (1) FR3048731B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3079299B1 (en) * 2018-03-22 2020-06-05 Safran Aircraft Engines DEVICE FOR MEASURING THE CHARACTERISTICS OF AN AIR FLOW
FR3114383B1 (en) * 2020-09-22 2022-11-25 Renault Sas Heat treatment module for internal combustion engine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4199511B2 (en) * 2002-10-02 2008-12-17 日野自動車株式会社 EGR cooler
ATE454544T1 (en) * 2004-02-01 2010-01-15 Behr Gmbh & Co Kg ARRANGEMENT FOR COOLING EXHAUST AND CHARGE AIR
DE102006023855A1 (en) * 2006-05-19 2007-11-22 Mahle International Gmbh Exhaust gas recirculation device
DE102007036301A1 (en) * 2007-07-31 2009-02-05 Behr Gmbh & Co. Kg Heat exchanger housing, heat exchanger or assembly with one or more heat exchangers, exhaust gas recirculation system, charge air supply system and use of the heat exchanger
FR2932223B1 (en) * 2008-06-06 2011-04-29 Peugeot Citroen Automobiles Sa EGR CIRCUIT HAVING A THERMOSTATIC BY-PASS VALVE ACTUATOR AND METHOD OF CONTROLLING SUCH A GEAR CIRCUIT
GB2493741B (en) * 2011-08-17 2017-02-22 Gm Global Tech Operations Llc Exhaust gas recirculation system for an internal combustion engine
FR2991393B1 (en) * 2012-05-30 2014-06-06 Peugeot Citroen Automobiles Sa EXHAUST GAS RECYCLING LINE STRUCTURE OF A THERMAL ENGINE

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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FR3048731A1 (en) 2017-09-15
EP3217006A1 (en) 2017-09-13

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