WO2021170442A1 - Egr circuit exchanger with ventilation - Google Patents

Egr circuit exchanger with ventilation Download PDF

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Publication number
WO2021170442A1
WO2021170442A1 PCT/EP2021/053657 EP2021053657W WO2021170442A1 WO 2021170442 A1 WO2021170442 A1 WO 2021170442A1 EP 2021053657 W EP2021053657 W EP 2021053657W WO 2021170442 A1 WO2021170442 A1 WO 2021170442A1
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WO
WIPO (PCT)
Prior art keywords
gases
engine
exchanger
burnt
heat
Prior art date
Application number
PCT/EP2021/053657
Other languages
French (fr)
Inventor
Eric Dumas
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
Publication of WO2021170442A1 publication Critical patent/WO2021170442A1/en

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Classifications

    • 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
    • F28D7/163—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 with conduit assemblies having a particular shape, e.g. square or annular; with assemblies of conduits having different geometrical features; with multiple groups of conduits connected in series or parallel and arranged inside common casing
    • F28D7/1669—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 with conduit assemblies having a particular shape, e.g. square or annular; with assemblies of conduits having different geometrical features; with multiple groups of conduits connected in series or parallel and arranged inside common casing the conduit assemblies having an annular shape; the conduits being assembled around a central distribution tube
    • 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
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F02M26/34—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with compressors, turbines or the like 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
    • F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
    • 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
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
    • F28F13/125—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation by stirring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/026—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits
    • F28F9/0265—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits by using guiding means or impingement means inside the header box
    • 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
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/008—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for vehicles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/01—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using means for separating solid materials from heat-exchange fluids, e.g. filters
    • 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
    • F28F2250/08—Fluid driving means, e.g. pumps, fans
    • 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

  • the present invention relates to an internal combustion engine equipped with an exhaust gas depollution system.
  • the present invention relates more particularly to a device for heating the pollution control system of the associated internal combustion engine.
  • a motor vehicle has a pollution control device arranged downstream of a heat engine according to the direction of flow of the exhaust gases.
  • Said vehicle thus comprises an internal combustion or thermal engine associated with an electric motor with a battery.
  • the heat engine can also be associated with an electric motor for so-called hybrid motor vehicles and then requested as a function of the charge of the battery of the electric motor.
  • the electric motor is generally used in a driving phase which follows the starting of the vehicle.
  • the heat engine is fitted with a pollution control system which may vary depending on the engine, but in all cases the pollution control system includes at least one pollution control element.
  • the internal combustion engine comprises a burnt gas exhaust circuit connected to an exhaust outlet of said engine.
  • said internal combustion engine is connected to pollution control systems arranged in the engine exhaust line. These systems include a catalyst or a particulate filter.
  • An engine exhaust line is used to refer to the entire path of flue gases flowing from the engine from the exhaust valves.
  • -high pressure recirculated gases taken from the upstream exhaust circuit according to the direction of flow of the gases from pollution control devices such as, for example, a catalyst or nitrogen oxide trap (Nox).
  • pollution control devices such as, for example, a catalyst or nitrogen oxide trap (Nox).
  • high pressure recirculated flue gases are taken directly from an exhaust manifold attached to an exhaust face of the cylinder head on the lateral side opposite the intake face. The high pressure recirculated gases are then sent to the intake ducts or to the intake manifold.
  • low-pressure recirculated burnt gases taken from the exhaust circuit and in a known manner after a pollution control device. Said low pressure recirculated gases are returned in a known manner to the intake circuit upstream of the compressor. They are then mixed with the fresh air captured from the front of the vehicle.
  • the low-pressure recirculated burnt gases must be cooled before mixing with the fresh air, in particular before reaching a so-called EGR valve capable of controlling the flow rate of the burnt gases in the mixture with the fresh air.
  • the exhaust line can therefore include a flue gas cooler arranged in a recirculation circuit downstream of the pollution control devices.
  • the cooler is generally formed by a water / gas heat exchanger through which the gases here burnt give up part of their heat to a water-based cooling liquid.
  • the publication FR2930296-A1 thus proposes an exchanger arranged in a flue gas recirculation loop downstream of an internal combustion engine pollution control system.
  • the overall size of the assembly can be very large and goes against the tendency to reduce the volume of the engine compartment of the vehicle in which the engine is installed with all the systems necessary for the operation of the engine as well as the pollution control systems including the low pressure flue gas heat exchanger.
  • the publication FR FR2981983-A1 proposes a recirculation of the burnt gases punctured downstream of the pollution control element to be brought back upstream of said pollution control element to improve the rise in temperature of the gases upstream of the pollution control element.
  • This proposal makes it possible to accelerate the rise in temperature of the burnt gases upstream of the pollution control element but has reduced efficiency during the engine start-up phases because the temperature of the gases is not sufficiently high, the pollution remains appreciably high. during engine starting phases.
  • the aim of the invention is to remedy these problems and one of the objects of the invention is a heat exchange device arranged in a recirculation circuit of the combustion engine gases in order to improve the flow rate of the recirculation gases with a optimization of the overall dimensions of the powertrain components.
  • the present invention relates more particularly to a heat exchange device for burnt gases from a heat engine of a motor vehicle arranged in a burnt gas recirculation circuit, in particular at low pressure,
  • the device comprises a casing enclosing a heat exchanger and a gas mixing means.
  • the heat exchange device comprises a casing surrounding a heat exchanger and a gas stirring means to improve the circulation of the cooled gases as the device passes, while optimizing the size of the assembly.
  • the stirring means comprises blades capable of generating a vortex movement of the gases.
  • the stirring means allows a mixture of the cooled gases following their passage through the exchanger.
  • the blades are movable in rotation about a longitudinal axis of the housing.
  • the blades are movable in rotation about an axis to accelerate the flow of gases.
  • the blades are actuated by an electric motor extending along the longitudinal axis.
  • the stirring of the gases is achieved by means of the blades rotating around the longitudinal axis by means of an electric motor which extends along said axis in order to minimize the overall size of the assembly.
  • the heat exchanger surrounds the engine.
  • the exchanger surrounds the engine and diffuses the gases on the peripheral part of the blades to obtain relatively high homogeneity of downstream gas velocities.
  • the engine is directly cooled by the exchanger which surrounds it, which makes it possible to evacuate the calories generated by the operation of the engine in a simple manner.
  • the exchanger is annular in shape.
  • annular shape of the exchanger allows homogeneity of the gas flows downstream of the exchanger.
  • FIG. 1 is a schematic view of a heat exchange device of a burnt gas recirculation branch of a heat engine.
  • FIG. 2 is a schematic view of a heat exchange device of a combustion engine exhaust gas recirculation branch according to the invention.
  • FIG. 3 is a longitudinal sectional diagram of the heat exchange device.
  • upstream and downstream will be used without limitation, which are determined by the direction of flow of the exhaust gases in the exhaust line of the pollution control device and of the control circuit.
  • EGR Exhaust Gas Recirculation
  • the invention relates to a motor vehicle with an internal combustion engine comprising a low pressure burnt gas recirculation circuit.
  • the heat engine (not shown) comprises an intake air compression stage 51 which can be associated with a turbine stage 52 capable of at least partially recovering the dynamic energy of the burnt gases leaving a combustion chamber of the engine.
  • the two stages form a 50 turbocharger.
  • the heat engine comprises a recirculation circuit 20 of the burnt gases.
  • the burnt gases in the embodiment shown are low pressure burnt gases, that is to say that said burnt gases are taken from the exhaust line 30 downstream of a pollution control element such as 'a so-called selective catalytic reduction catalyst 31, also known by the acronym SCR for "Selective Catalytic Reduction” in English terminology, which is designed to remove nitrogen oxides, or a particulate filter to remove soot particles, or an oxidation catalyst also known by the acronym DOC for "Diesel Oxidation Catalyst” in English terminology, to remove carbon monoxide (CO) and unburnt hydrocarbons.
  • SCR selective catalytic reduction catalyst
  • DOC oxidation Catalyst
  • the burnt gases are cooled on passing through a heat exchanger 12 of gas-coolant type arranged in the recirculation circuit 20 of the EGR burnt gases.
  • the gases deposit some of their heat before re-entering the engine, mixed with so-called cool air.
  • the density of the gases then being greater allows better efficiency of the heat engine.
  • the speed of the gases is appreciably reduced and may result in less constant mixing with the fresh air.
  • the burnt gases are returned upstream 53 of the compression stage 51.
  • the object of the invention is to provide a heat exchange device for said low pressure EGR flue gases by reducing or even eliminating the impact cited above of the passage of the gases through the exchanger.
  • said heat exchange device 10 is arranged in a branch 21 of the recirculation circuit 20 of the EGR flue gas.
  • the recirculation branch 21 is substantially tubular and connected at a first end to an exhaust duct 32 of the exhaust line 30 between the pollution control element 31 and for example a catalytic converter 33, and to the 'end opposite to a portion of the intake circuit 53 upstream for example of the compression stage 51 of the turbocharger 50.
  • the catalytic converter 33 forms an obstacle that can generate significant pressure drops in the circulation of burnt gases which are then partially directed towards the recirculation branch 21.
  • the branch 21 comprises an impurity filter 22 which can be arranged at its upstream end according to the direction of gas flow.
  • the direction of gas flow is marked by arrows in figure 2.
  • a so-called EGR valve 25 is able to control the flow of recirculated gases to the intake circuit 53 of the engine.
  • the EGR valve 25 is arranged downstream of the exchange device 10.
  • the device 10 for exchanging the heat of the burnt gases arranged in the recirculation branch 21 comprises a substantially cylindrical casing 11, a heat exchanger 12 and a means for mixing the gases. burnt gases 14.
  • the casing 11 surrounds the exchanger 12 and the stirring means 14.
  • the impurity filter 22 may be part of the exchange device 10. It can for example be arranged at the inlet 11a in the casing 11 as shown in FIG. 3. This embodiment makes it possible to reduce the number of parts to be assembled in the recirculation branch 21.
  • the heat exchanger 12 is of the air / water type here gas / coolant, the coolant is water-based.
  • the heat exchanger 12 is annular in shape along a longitudinal axis X surrounding a tubular capsule 13.
  • said exchanger 12 comprises tubular gas channels 15 which extend parallel to the longitudinal axis X. The gases are conveyed in these channels from upstream to downstream of the exchanger 12 parallel to the longitudinal axis X.
  • the gas channels 15 are housed in an annular chamber 16 enveloped or delimited by the casing 11. Said chamber 16 is traversed by cooling liquid from an upstream junction 16 am to a downstream junction 16 a .
  • the upstream 16 am and downstream 16 av junctions are connected to an engine cooling circuit for example.
  • a preferably electric motor 17, which extends along the longitudinal axis X, is inserted into the capsule 13.
  • the motor comprises an actuation shaft 17a which holds the blades or propellers 18 extending radially.
  • the peripheral ends of the propellers 18 are close to the inner wall of the casing 11, up to the operating clearance.
  • the blades are able to generate a swirling movement of the gases downstream of the exchange device 10 to allow homogeneity of the gases.
  • the wall of the motor 17 is substantially complementary with the wall of the capsule 13 except for the assembly clearance.
  • the wall of the capsule 13 may have a substantially conical or hemispherical shape 13a at an upstream end facing the gas inlet 11a in the casing 11, forming a deflector for directing the gases towards the channels 15, in order to reduce the losses. of loads.
  • the tubular capsule 13 is in contact with the cooling liquid.
  • the heat of the gases has no impact on the temperature of the engine of the engine 17 and on its operation.
  • the heat can be dissipated simply by the coolant and the engine temperature is kept below a temperature threshold not likely to cause engine failure.
  • the engine is thus cooled by the heat exchanger, avoiding the risk of local overheating.
  • the channels 15 open at their downstream end into a peripheral part of the blades 18.
  • the burnt gases are re-accelerated by the movement of the blades and then take a substantially homogeneous speed in the rest of their journey to the intake circuit.
  • the blades 18 are activated when the EGR valve is opened.
  • the burnt gases are directed to the intake circuit 53.
  • Activation of the stirring means 14 allows them to cross the various obstacles on the route.
  • the stirring means is not very energy intensive and is sufficient to improve the circulation of the burnt gases.
  • the burnt gases recirculated after passing through the exchanger can be pushed to the intake circuit 53 to improve mixing with the fresh air.
  • the command to open the EGR valve therefore also causes the activation of the stirring means.
  • the circulation of the EGR recirculated gases follows a process which controls the opening of the EGR valve with the triggering of the motor of the stirring means 14, as well as the closing of the EGR valve with the stopping of the motor of the stirring means substantially. synchronous.
  • the exchange device allows heat exchange of the burnt gases with a coolant with a re-acceleration of the burnt gases downstream of said device.
  • the exchanger may be of a different type, for example comprising a helical water pipe immersed in a gas passage chamber.

Abstract

The invention relates to a device (10) for the heat exchange of burnt gases of a heat engine of a motor vehicle, which is arranged in a recirculation circuit (20) of burnt gases, in particular low-pressure burnt gases, characterized in that the device (10) comprises a casing (11) enclosing a heat exchanger (12) and a means (14) for agitating gases.

Description

TITRE : Echangeur de circuit EGR avec ventilation TITLE: EGR circuit exchanger with ventilation
Domaine technique de l’invention Technical field of the invention
La présente invention concerne un moteur à combustion interne équipé d’un système de dépollution des gaz d’échappement. The present invention relates to an internal combustion engine equipped with an exhaust gas depollution system.
La présente invention concerne plus particulièrement un dispositif de chauffage du système de dépollution du moteur à combustion interne associé. The present invention relates more particularly to a device for heating the pollution control system of the associated internal combustion engine.
Etat de la technique State of the art
Afin de réduire les émissions de polluants dans l’atmosphère, un véhicule automobile comporte un dispositif de dépollution disposé en aval d’un moteur thermique selon le sens de circulation des gaz d’échappement. Ledit véhicule comporte ainsi un moteur à combustion interne ou thermique associé avec un moteur électrique avec une batterie. In order to reduce the emissions of pollutants into the atmosphere, a motor vehicle has a pollution control device arranged downstream of a heat engine according to the direction of flow of the exhaust gases. Said vehicle thus comprises an internal combustion or thermal engine associated with an electric motor with a battery.
Le moteur thermique peut aussi être associé à un moteur électrique pour des véhicules automobiles dits hybrides et sollicité ensuite en fonction de la charge de la batterie du moteur électrique. Le moteur électrique est généralement employé dans une phase de roulage qui suit le démarrage du véhicule. The heat engine can also be associated with an electric motor for so-called hybrid motor vehicles and then requested as a function of the charge of the battery of the electric motor. The electric motor is generally used in a driving phase which follows the starting of the vehicle.
Le moteur thermique est équipe d’un système de dépollution qui peut varier selon la motorisation mais, dans tous les cas, le système de dépollution comprend au moins un élément de dépollution. The heat engine is fitted with a pollution control system which may vary depending on the engine, but in all cases the pollution control system includes at least one pollution control element.
De manière connue, le moteur à combustion interne comporte un circuit d’échappement de gaz brûlés connecté à une sortie d’échappement dudit moteur. Pour réduire les rejets de polluants à l’extérieur du véhicule, ledit moteur à combustion interne est connecté à des systèmes de dépollution disposés dans la ligne d’échappement du moteur. Ces systèmes comprennent un catalyseur ou un filtre à particules. On appelle ligne d’échappement d’un moteur tout le circuit des gaz brûlés issus du moteur depuis des soupapes d’échappement. In known manner, the internal combustion engine comprises a burnt gas exhaust circuit connected to an exhaust outlet of said engine. To reduce the discharge of pollutants outside the vehicle, said internal combustion engine is connected to pollution control systems arranged in the engine exhaust line. These systems include a catalyst or a particulate filter. An engine exhaust line is used to refer to the entire path of flue gases flowing from the engine from the exhaust valves.
Pour réduire des rejets de polluants générés par la combustion, il est connu de ramener des gaz brûlés de la ligne d’échappement c’est-à-dire en aval de la combustion dans les cylindres, vers les conduits d’admission. On a ainsi différents types de gaz brûlés recirculés : To reduce emissions of pollutants generated by combustion, it is known practice to return burnt gases from the exhaust line, that is to say downstream of the combustion in the cylinders, to the intake ducts. There are thus different types of recirculated flue gas:
-des gaz recirculés haute pression prélevés depuis le circuit d’échappement en amont selon le sens d’écoulement des gaz de dispositifs de dépollution comme par exemple un catalyseur ou piège à oxyde d’azote (Nox). De manière générale, les gaz brûlés recirculés haute pression sont prélevés directement depuis un collecteur d’échappement fixé à une face d’échappement de la culasse, du côté latéral opposé à la face d’admission. Les gaz recirculés haute pression sont envoyés ensuite vers les conduits d’admission ou dans le répartiteur d’admission. -high pressure recirculated gases taken from the upstream exhaust circuit according to the direction of flow of the gases from pollution control devices such as, for example, a catalyst or nitrogen oxide trap (Nox). Typically, high pressure recirculated flue gases are taken directly from an exhaust manifold attached to an exhaust face of the cylinder head on the lateral side opposite the intake face. The high pressure recirculated gases are then sent to the intake ducts or to the intake manifold.
-des gaz brûlés recirculés basse pression prélevés dans le circuit d’échappement et de manière connue après un dispositif de dépollution. Lesdits gaz recirculés basse pression sont renvoyés de manière connue dans le circuit d’admission en amont du compresseur. Ils sont alors mélangés avec l’air frais capté en face avant du véhicule. Les gaz brûlés recirculés basse pression doivent être refroidis avant le mélange avec l’air frais notamment avant d’atteindre une vanne dite vanne EGR apte à contrôler le débit de gaz brûlés dans le mélange avec l’air frais. La ligne d’échappement peut donc comprendre un refroidisseur des gaz brûlés disposé dans un circuit de recirculation en aval des dispositifs de dépollution. Le refroidisseur est généralement formé par un échangeur de chaleur eau/gaz au travers duquel les gaz ici brûlés cèdent une partie de leur chaleur à un liquide de refroidissement à base d’eau.low-pressure recirculated burnt gases taken from the exhaust circuit and in a known manner after a pollution control device. Said low pressure recirculated gases are returned in a known manner to the intake circuit upstream of the compressor. They are then mixed with the fresh air captured from the front of the vehicle. The low-pressure recirculated burnt gases must be cooled before mixing with the fresh air, in particular before reaching a so-called EGR valve capable of controlling the flow rate of the burnt gases in the mixture with the fresh air. The exhaust line can therefore include a flue gas cooler arranged in a recirculation circuit downstream of the pollution control devices. The cooler is generally formed by a water / gas heat exchanger through which the gases here burnt give up part of their heat to a water-based cooling liquid.
Il est connu de disposer un tel échangeur dans une branche de recirculation de gaz brûlés connectée à la ligne d’échappement par un raccord de déviation généralement en T. It is known to have such an exchanger in a burnt gas recirculation branch connected to the exhaust line by a generally T-shaped deflection connection.
La publication FR2930296-A1 propose ainsi un échangeur disposé dans une boucle de recirculation de gaz brûlés en aval d’un système de dépollution de moteur à combustion interne. L’encombrement de l’ensemble peut être très important et va à l’encontre de la tendance de la réduction du volume du compartiment moteur du véhicule dans lequel sont mis en place le moteur avec tous les systèmes nécessaires au fonctionnement du moteur ainsi que les systèmes de dépollution dont fait partie l’échangeur de chaleur de gaz brûlés basse pression.The publication FR2930296-A1 thus proposes an exchanger arranged in a flue gas recirculation loop downstream of an internal combustion engine pollution control system. The overall size of the assembly can be very large and goes against the tendency to reduce the volume of the engine compartment of the vehicle in which the engine is installed with all the systems necessary for the operation of the engine as well as the pollution control systems including the low pressure flue gas heat exchanger.
De plus , la recirculation des gaz brûlés basse pression vers l’admission est ralentie par le passage au travers de l’échangeur. Il est connu de disposer alors en aval de l’échangeur une pompe de circulation des gaz, laquelle pompe peut être volumineuse et susceptible de procurer un débit plus que nécessaire. In addition, the recirculation of low pressure flue gases to the inlet is slowed down by passing through the exchanger. It is known to then have a gas circulation pump downstream of the exchanger, which pump can be bulky and capable of providing more than necessary flow.
La publication FR FR2981983-A1 propose une recirculation des gaz brûlés piqués en aval de l’élément de dépollution pour être ramenés en amont dudit élément de dépollution pour améliorer la montée en température des gaz en amont de l’élément de dépollution. The publication FR FR2981983-A1 proposes a recirculation of the burnt gases punctured downstream of the pollution control element to be brought back upstream of said pollution control element to improve the rise in temperature of the gases upstream of the pollution control element.
Cette proposition permet d’accélérer la montée en température des gaz brûlés en amont de l’élément de dépollution mais présente une efficacité réduite lors des phases de démarrage du moteur car la température des gaz n’est pas suffisamment forte, la pollution reste sensiblement importante lors des phases de démarrage du moteur. This proposal makes it possible to accelerate the rise in temperature of the burnt gases upstream of the pollution control element but has reduced efficiency during the engine start-up phases because the temperature of the gases is not sufficiently high, the pollution remains appreciably high. during engine starting phases.
Le but de l’invention est de remédier à ces problèmes et un des objets de l’invention est un dispositif d’échange de chaleur disposé dans un circuit de recirculation des gaz brûlés de moteur thermique pour améliorer le débit des gaz de recirculation avec une optimisation de l’encombrement de l’ensemble de éléments du groupe motopropulseur. The aim of the invention is to remedy these problems and one of the objects of the invention is a heat exchange device arranged in a recirculation circuit of the combustion engine gases in order to improve the flow rate of the recirculation gases with a optimization of the overall dimensions of the powertrain components.
Présentation de l’invention Presentation of the invention
La présente invention concerne plus particulièrement un dispositif d’échange de chaleur pour gaz brûlés d’un moteur thermique d’un véhicule automobile disposé dans un circuit de recirculation de gaz brûlés notamment basse pression, The present invention relates more particularly to a heat exchange device for burnt gases from a heat engine of a motor vehicle arranged in a burnt gas recirculation circuit, in particular at low pressure,
Caractérisé en ce que le dispositif comprend un carter enveloppant un échangeur de chaleur et un moyen de brassage des gaz. De manière avantageuse, le dispositif d’échange de chaleur comprend un carter enveloppant un échangeur de chaleur et un moyen de brassage des gaz pour améliorer la circulation des gaz refroidis au passage du dispositif tout en optimisant l’encombrement de l’ensemble. Characterized in that the device comprises a casing enclosing a heat exchanger and a gas mixing means. Advantageously, the heat exchange device comprises a casing surrounding a heat exchanger and a gas stirring means to improve the circulation of the cooled gases as the device passes, while optimizing the size of the assembly.
Selon d’autres caractéristiques de l’invention : According to other characteristics of the invention:
-le moyen de brassage comporte des pales aptes à engendrer un mouvement tourbillonnaire des gaz. the stirring means comprises blades capable of generating a vortex movement of the gases.
De manière avantageuse, le moyen de brassage permet un mélange des gaz refroidis suite à leur passage au travers de l’échangeur. Advantageously, the stirring means allows a mixture of the cooled gases following their passage through the exchanger.
-les pales sont mobiles en rotation autour d’un axe longitudinal du carter. -the blades are movable in rotation about a longitudinal axis of the housing.
De manière avantageuse, les pales sont mobiles en rotation autour d’un axe pour accélérer la circulation des gaz. Advantageously, the blades are movable in rotation about an axis to accelerate the flow of gases.
-les pales sont actionnées par un moteur électrique s’étendant selon l’axe longitudinal. -the blades are actuated by an electric motor extending along the longitudinal axis.
De manière avantageuse, le brassage des gaz est réalisé grâce aux pales tournant autour de l’axe longitudinal grâce à un moteur électrique qui s’étend selon ledit axe afin de minimiser l’encombrement de l’ensemble. Advantageously, the stirring of the gases is achieved by means of the blades rotating around the longitudinal axis by means of an electric motor which extends along said axis in order to minimize the overall size of the assembly.
-l’échangeur entoure le moteur. -the heat exchanger surrounds the engine.
De manière avantageuse, l’échangeur entoure le moteur et diffuse les gaz sur la partie périphérique des pales pour obtenir une homogénéité des vitesses des gaz en aval relativement importantes. Advantageously, the exchanger surrounds the engine and diffuses the gases on the peripheral part of the blades to obtain relatively high homogeneity of downstream gas velocities.
De cette manière, on obtient un moindre effet impactant de la disposition du moteur, notamment en pertes de charges. In this way, a less impacting effect of the arrangement of the motor is obtained, in particular in pressure drops.
-le moteur est refroidi par l’échangeur. -the engine is cooled by the exchanger.
De manière avantageuse, le moteur est directement refroidi par l’échangeur qui l’entoure, ce qui permet d’évacuer les calories générées par le fonctionnement du moteur de façon simple. Advantageously, the engine is directly cooled by the exchanger which surrounds it, which makes it possible to evacuate the calories generated by the operation of the engine in a simple manner.
-l’échangeur est de forme annulaire. -the exchanger is annular in shape.
De manière avantageuse, la forme annulaire de l’échangeur permet une homogénéité des écoulements des gaz en aval de l’échangeur. Advantageously, the annular shape of the exchanger allows homogeneity of the gas flows downstream of the exchanger.
Brève description des figures Brief description of the figures
D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description qui suit de modes particuliers de réalisation de l'invention donnés à titre d'exemples non limitatifs et représentés sur les dessins annexés, dans lesquels : [Fig. 1] est une vue schématique d’un dispositif d’échange de chaleur d’une branche de recirculation de gaz brûlés d’un moteur thermique. Other characteristics and advantages of the invention will become apparent on reading the following description of particular embodiments of the invention given by way of non-limiting examples and shown in the appended drawings, in which: [Fig. 1] is a schematic view of a heat exchange device of a burnt gas recirculation branch of a heat engine.
[Fig. 2] est une vue schématique d’un dispositif d’échange de chaleur d’une branche de recirculation de gaz brûlés de moteur thermique selon l’invention. [Fig. 2] is a schematic view of a heat exchange device of a combustion engine exhaust gas recirculation branch according to the invention.
[Fig. 3] est une schématique de coupe longitudinale du dispositif d’échange de chaleur. [Fig. 3] is a longitudinal sectional diagram of the heat exchange device.
Dans la description qui va suivre, des chiffres de référence identiques désignent des pièces identiques ou ayant des fonctions similaires. In the description which follows, identical reference numerals denote identical parts or having similar functions.
Dans la description et les revendications, on utilisera à titre non limitatif les expressions «amont» et «aval» qui sont déterminées par le sens d'écoulement des gaz d'échappement dans la ligne d'échappement du dispositif de dépollution et du circuit de recirculation des gaz brûlés recirculés ou EGR acronyme pour « Exhaust Gaz Recirculation » en anglais, en référence aux flèches de la figure 1 qui représente une ligne d’échappement de moteur thermique comportant une branche de recirculation des gaz brûlés. In the description and the claims, the expressions “upstream” and “downstream” will be used without limitation, which are determined by the direction of flow of the exhaust gases in the exhaust line of the pollution control device and of the control circuit. recirculation of recirculated burnt gases or EGR acronym for “Exhaust Gas Recirculation” in English, with reference to the arrows in FIG. 1 which represents a heat engine exhaust line comprising a burnt gas recirculation branch.
L’invention concerne un véhicule automobile avec une motorisation thermique comprenant un circuit de recirculation des gaz brûlés basse pression. The invention relates to a motor vehicle with an internal combustion engine comprising a low pressure burnt gas recirculation circuit.
Afin d’améliorer les performances du moteur thermique ou à combustion interne, le moteur thermique (non représenté) comprend un étage de compression 51 d’air d’admission qui peut être associé avec un étage de turbine 52 apte à récupérer au moins en partie l’énergie dynamique des gaz brûlés en sortie d’une chambre à combustion du moteur. Les deux étages forment un turbocompresseur 50. In order to improve the performance of the heat engine or internal combustion engine, the heat engine (not shown) comprises an intake air compression stage 51 which can be associated with a turbine stage 52 capable of at least partially recovering the dynamic energy of the burnt gases leaving a combustion chamber of the engine. The two stages form a 50 turbocharger.
Afin de diminuer la génération des polluants, le moteur thermique comporte un circuit de recirculation 20 des gaz brûlés. Selon l’invention, les gaz brûlés dans le mode de réalisation représenté sont des gaz brûlés basse pression c’est-à-dire que lesdits gaz brûlés sont prélevés dans la ligne d’échappement 30 en aval d’un élément de dépollution tel qu’un catalyseur 31 dit de réduction catalytique sélective, aussi connu sous le sigle SCR pour "Sélective Catalytic Réduction" en terminologie anglaise, qui est conçu pour éliminer les oxydes d'azotes, ou un filtre à particules pour éliminer les particules de suie, ou un catalyseur d'oxydation aussi connu sous le sigle DOC pour "Diesel Oxydation Catalyst" en terminologie anglaise, pour éliminer le monoxyde de carbone (CO) et les hydrocarbures imbrûlés. Les gaz brûlés sont ensuite renvoyés vers l’admission du moteur en suivant le circuit de recirculation 20 pour être mélangés avec de l’air frais capté depuis la face avant du véhicule. In order to reduce the generation of pollutants, the heat engine comprises a recirculation circuit 20 of the burnt gases. According to the invention, the burnt gases in the embodiment shown are low pressure burnt gases, that is to say that said burnt gases are taken from the exhaust line 30 downstream of a pollution control element such as 'a so-called selective catalytic reduction catalyst 31, also known by the acronym SCR for "Selective Catalytic Reduction" in English terminology, which is designed to remove nitrogen oxides, or a particulate filter to remove soot particles, or an oxidation catalyst also known by the acronym DOC for "Diesel Oxidation Catalyst" in English terminology, to remove carbon monoxide (CO) and unburnt hydrocarbons. The burnt gases are then returned to the engine intake by following the recirculation circuit 20 to be mixed with the fresh air collected from the front of the vehicle.
De manière connue, les gaz brûlés sont refroidis au passage au travers d’un échangeur de chaleur 12 de type gaz-liquide de refroidissement disposé dans le circuit de recirculation 20 des gaz brûlés EGR. Les gaz déposent une partie de leur chaleur avant leur réadmission dans le moteur, mélangés avec de l’air dit frais. La densité des gaz étant alors supérieure permet une meilleure efficacité du moteur thermique. In known manner, the burnt gases are cooled on passing through a heat exchanger 12 of gas-coolant type arranged in the recirculation circuit 20 of the EGR burnt gases. The gases deposit some of their heat before re-entering the engine, mixed with so-called cool air. The density of the gases then being greater allows better efficiency of the heat engine.
Cependant, en traversant ledit échangeur 12, la vitesse des gaz est sensiblement réduite et peut entraîner un mélange moins constant avec l’air frais. Ici, les gaz brûlés sont renvoyés en amont 53 de l’étage de compression 51 . However, by passing through said exchanger 12, the speed of the gases is appreciably reduced and may result in less constant mixing with the fresh air. Here, the burnt gases are returned upstream 53 of the compression stage 51.
L’invention a pour but de proposer un dispositif d’échange 10 de chaleur pour lesdits gaz brûlés EGR basse pression en réduisant voire en supprimant l’impact cité ci-dessus du passage des gaz au travers de l’échangeur. The object of the invention is to provide a heat exchange device for said low pressure EGR flue gases by reducing or even eliminating the impact cited above of the passage of the gases through the exchanger.
Selon la figure 1 , ledit dispositif d’échange de chaleur 10 est disposé dans une branche 21 du circuit de recirculation 20 des gaz brûlés EGR. According to Figure 1, said heat exchange device 10 is arranged in a branch 21 of the recirculation circuit 20 of the EGR flue gas.
De manière préférentielle, la branche 21 de recirculation est sensiblement tubulaire et connectée à une première extrémité à un conduit d’échappement 32 de la ligne d’échappement 30 entre l’élément de dépollution 31 et par exemple un pot catalytique 33, et à l’extrémité opposée à une portion du circuit d’admission 53 en amont par exemple de l’étage de compression 51 du turbocompresseur 50. Le pot catalytique 33 forme un obstacle pouvant générer des pertes de charges importantes à la circulation de gaz brûlés qui sont alors partiellement dirigés vers la branche 21 de recirculation. Preferably, the recirculation branch 21 is substantially tubular and connected at a first end to an exhaust duct 32 of the exhaust line 30 between the pollution control element 31 and for example a catalytic converter 33, and to the 'end opposite to a portion of the intake circuit 53 upstream for example of the compression stage 51 of the turbocharger 50. The catalytic converter 33 forms an obstacle that can generate significant pressure drops in the circulation of burnt gases which are then partially directed towards the recirculation branch 21.
De manière préférentielle, la branche 21 comprend un filtre à impuretés 22 qui peut être agencé à son extrémité amont selon le sens de circulation des gaz. Le sens de circulation des gaz est marqué par des flèches dans la figure 2. Preferably, the branch 21 comprises an impurity filter 22 which can be arranged at its upstream end according to the direction of gas flow. The direction of gas flow is marked by arrows in figure 2.
Une vanne dite vanne EGR 25 est apte à contrôler le débit des gaz recirculés vers le circuit d’admission 53 du moteur. La vanne EGR 25 est disposée en aval du dispositif d’échange 10.A so-called EGR valve 25 is able to control the flow of recirculated gases to the intake circuit 53 of the engine. The EGR valve 25 is arranged downstream of the exchange device 10.
Selon un mode de réalisation de l’invention représenté en figure 2, le dispositif d’échange de chaleur 10 des gaz brûlés agencé dans la branche 21 de recirculation comporte un carter 11 sensiblement cylindrique, un échangeur de chaleur 12 et un moyen de brassage des gaz brûlés 14. Le carter 11 enveloppe l’échangeur 12 et le moyen de brassage 14. According to one embodiment of the invention shown in FIG. 2, the device 10 for exchanging the heat of the burnt gases arranged in the recirculation branch 21 comprises a substantially cylindrical casing 11, a heat exchanger 12 and a means for mixing the gases. burnt gases 14. The casing 11 surrounds the exchanger 12 and the stirring means 14.
Selon un mode de réalisation, le filtre à impuretés 22 peut être partie du dispositif 10 d’échange. Il peut par exemple être agencé à l’entrée 11a dans le carter 11 comme représenté en figure 3. Ce mode de réalisation permet de réduire le nombre de pièces à assembler dans la branche 21 de recirculation. According to one embodiment, the impurity filter 22 may be part of the exchange device 10. It can for example be arranged at the inlet 11a in the casing 11 as shown in FIG. 3. This embodiment makes it possible to reduce the number of parts to be assembled in the recirculation branch 21.
L’échangeur de chaleur 12 est de type air/eau ici gaz / liquide de refroidissement, le liquide de refroidissement est à base d’eau. L’échangeur de chaleur 12 est de forme annulaire selon un axe longitudinal X entourant une capsule tubulaire 13. The heat exchanger 12 is of the air / water type here gas / coolant, the coolant is water-based. The heat exchanger 12 is annular in shape along a longitudinal axis X surrounding a tubular capsule 13.
Dans un mode de réalisation préféré, ledit échangeur 12 comprend des canaux 15 de gaz tubulaires qui s’étendent parallèlement à l’axe longitudinal X. Les gaz sont acheminés dans ces canaux d’amont en aval de l’échangeur 12 parallèlement à l’axe longitudinal X. In a preferred embodiment, said exchanger 12 comprises tubular gas channels 15 which extend parallel to the longitudinal axis X. The gases are conveyed in these channels from upstream to downstream of the exchanger 12 parallel to the longitudinal axis X.
Les canaux de gaz 15 sont logés dans une chambre annulaire 16 enveloppée ou délimitée par le carter 11 . Ladite chambre 16 est traversée par du liquide de refroidissement depuis une jonction amont 16am jusqu’à une jonction aval 16a . Les jonctions amont 16am et aval 16av sont connectées à un circuit de refroidissement du moteur par exemple. Un moteur 17 de préférence électrique, qui s’étend selon l’axe longitudinal X, est inséré dans la capsule 13. Le moteur comprend un axe d’actionnement 17a qui tient des pales ou hélices 18 s’étendant radialement. De manière préférentielle, les extrémités périphériques des hélices 18 sont proches de la paroi intérieure du carter 11 au jeu de fonctionnement près. The gas channels 15 are housed in an annular chamber 16 enveloped or delimited by the casing 11. Said chamber 16 is traversed by cooling liquid from an upstream junction 16 am to a downstream junction 16 a . The upstream 16 am and downstream 16 av junctions are connected to an engine cooling circuit for example. A preferably electric motor 17, which extends along the longitudinal axis X, is inserted into the capsule 13. The motor comprises an actuation shaft 17a which holds the blades or propellers 18 extending radially. Preferably, the peripheral ends of the propellers 18 are close to the inner wall of the casing 11, up to the operating clearance.
Les pales sont aptes à engendrer un mouvement tourbillonnaire des gaz en aval du dispositif d’échange 10 pour permettre une homogénéité des gaz. The blades are able to generate a swirling movement of the gases downstream of the exchange device 10 to allow homogeneity of the gases.
De manière préférentielle, la paroi du moteur 17 est sensiblement complémentaire avec la paroi de la capsule 13 au jeu de montage près. La paroi de la capsule 13 peut présenter une forme sensiblement conique ou hémisphérique 13a à une extrémité amont tournée vers l’entrée 11 a des gaz dans le carter 11 , formant un déflecteur pour diriger les gaz vers les canaux 15, afin de diminuer les pertes de charges. Preferably, the wall of the motor 17 is substantially complementary with the wall of the capsule 13 except for the assembly clearance. The wall of the capsule 13 may have a substantially conical or hemispherical shape 13a at an upstream end facing the gas inlet 11a in the casing 11, forming a deflector for directing the gases towards the channels 15, in order to reduce the losses. of loads.
De manière préférentielle, la capsule tubulaire 13 est en contact avec le liquide de refroidissement. Ainsi la chaleur des gaz n’impacte sur la température du moteur du moteur 17 et sur son fonctionnement. La chaleur peut être évacuée simplement par le liquide de refroidissement et la température du moteur est maintenue en dessous d’un seuil de température non susceptible de provoquer des défaillances dudit moteur. Le moteur est ainsi refroidi par l’échangeur de chaleur, évitant des risques de surchauffes locales. Preferably, the tubular capsule 13 is in contact with the cooling liquid. Thus the heat of the gases has no impact on the temperature of the engine of the engine 17 and on its operation. The heat can be dissipated simply by the coolant and the engine temperature is kept below a temperature threshold not likely to cause engine failure. The engine is thus cooled by the heat exchanger, avoiding the risk of local overheating.
Les canaux 15 débouchent par leur extrémité aval dans une partie périphérique des pales 18. Les gaz brûlés sont réaccélérés par le mouvement des pales et prennent alors une vitesse sensiblement homogène dans la suite de leur parcours jusqu’au circuit d’admission. The channels 15 open at their downstream end into a peripheral part of the blades 18. The burnt gases are re-accelerated by the movement of the blades and then take a substantially homogeneous speed in the rest of their journey to the intake circuit.
De manière préférentielle, les pales 18 sont activées lors de l’ouverture de la vanne EGR. Lorsque la vanne EGR est ouverte, les gaz brûlés sont dirigés vers le circuit d’admission 53. L’activation du moyen de brassage 14 leur permet de franchir les différents obstacles du parcours. Le moyen de brassage est peu gourmand en énergie et suffit pour améliorer la circulation des gaz brûlés. Ainsi les gaz brûlés recirculés après leur passage au travers de l’échangeur peuvent être poussés vers le circuit d’admission 53 pour améliorer le mélange avec l’air frais. La commande d’ouverture de la vanne EGR entraîne donc également l’activation du moyen de brassage. Preferably, the blades 18 are activated when the EGR valve is opened. When the EGR valve is open, the burnt gases are directed to the intake circuit 53. Activation of the stirring means 14 allows them to cross the various obstacles on the route. The stirring means is not very energy intensive and is sufficient to improve the circulation of the burnt gases. Thus the burnt gases recirculated after passing through the exchanger can be pushed to the intake circuit 53 to improve mixing with the fresh air. The command to open the EGR valve therefore also causes the activation of the stirring means.
La circulation des gaz recirculés EGR suit un procédé qui pilote l’ouverture de la vanne EGR avec le déclenchement du moteur du moyen de brassage 14, ainsi que la fermeture de la vanne EGR avec l’arrêt du moteur du moyen de brassage de façon sensiblement synchrone. The circulation of the EGR recirculated gases follows a process which controls the opening of the EGR valve with the triggering of the motor of the stirring means 14, as well as the closing of the EGR valve with the stopping of the motor of the stirring means substantially. synchronous.
L’objectif est atteint : The goal is reached :
Le dispositif d’échange permet un échange de chaleur des gaz brûlés avec un liquide de refroidissement avec une réaccélération des gaz brûlés en aval dudit dispositif. The exchange device allows heat exchange of the burnt gases with a coolant with a re-acceleration of the burnt gases downstream of said device.
Comme il va de soi, l'invention ne se limite pas aux seules formes d'exécution de cette prise, décrites ci-dessus à titre d'exemples, elle en embrasse au contraire toutes les variantes. L’échangeur peut être de type différent par exemple comprenant un conduit d’eau hélicoïdal plongé dans une chambre de passage des gaz. As goes without saying, the invention is not limited to the sole embodiments of this plug, described above by way of examples, it embraces on the contrary all the variants thereof. The exchanger may be of a different type, for example comprising a helical water pipe immersed in a gas passage chamber.

Claims

Revendications Claims
1. Dispositif (10) d’échange de chaleur pour gaz brûlés d’un moteur thermique d’un véhicule automobile disposé dans un circuit de recirculation (20) de gaz brûlés notamment basse pression, 1. Heat exchange device (10) for burnt gases from a heat engine of a motor vehicle arranged in a recirculation circuit (20) of burnt gases, in particular low pressure,
Caractérisé en ce que le dispositif (10) comprend un carter (11) enveloppant un échangeur de chaleur (12) et un moyen de brassage (14) des gaz. Characterized in that the device (10) comprises a casing (11) enveloping a heat exchanger (12) and a gas mixing means (14).
2. Dispositif (10) selon la revendication 1 , caractérisé en ce que le moyen de brassage (14) comporte des pales (18) aptes à engendrer un mouvement tourbillonnaire des gaz. 2. Device (10) according to claim 1, characterized in that the stirring means (14) comprises blades (18) capable of generating a swirling movement of the gases.
3. Dispositif (10) selon la revendication 2, caractérisé en ce que les pales (18) sont mobiles en rotation autour d’un axe longitudinal X du carter (11). 3. Device (10) according to claim 2, characterized in that the blades (18) are movable in rotation about a longitudinal axis X of the housing (11).
4. Dispositif (10) selon la revendication 2 ou 3, caractérisé en ce que les pales (18) sont actionnées par un moteur électrique (17) du moyen de brassage (14) s’étendant selon l’axe longitudinal X. 4. Device (10) according to claim 2 or 3, characterized in that the blades (18) are actuated by an electric motor (17) of the stirring means (14) extending along the longitudinal axis X.
5. Dispositif (10) selon la revendication 4, caractérisé en ce que l’échangeur (12) entoure le moteur (15) du moyen de brassage (14). 5. Device (10) according to claim 4, characterized in that the exchanger (12) surrounds the motor (15) of the stirring means (14).
6. Dispositif (10) selon la revendication 4 ou 5, caractérisé en ce que le moteur (17) est refroidi par l’échangeur de chaleur (12). 6. Device (10) according to claim 4 or 5, characterized in that the motor (17) is cooled by the heat exchanger (12).
7. Dispositif (10) selon l’une quelconque des revendications 1 à 6, caractérisé en ce que l’échangeur de chaleur (12) est de forme annulaire. 7. Device (10) according to any one of claims 1 to 6, characterized in that the heat exchanger (12) is annular in shape.
8. Circuit de recirculation (20) des gaz brûlés EGR comprenant une branche (21) passant par le dispositif selon l’une quelconque des revendications 1 à 7. 8. EGR burnt gas recirculation circuit (20) comprising a branch (21) passing through the device according to any one of claims 1 to 7.
PCT/EP2021/053657 2020-02-26 2021-02-15 Egr circuit exchanger with ventilation WO2021170442A1 (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
US20220260315A1 (en) * 2021-02-15 2022-08-18 Mitsubishi Heavy Industries, Ltd. Heat exchanger

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US20040055740A1 (en) * 2002-09-20 2004-03-25 Meshenky Steven P. Internally mounted radial flow intercooler for a combustion air charger
US20080020247A1 (en) * 2006-07-20 2008-01-24 Modine Manufacturing Company Compact air preheater for solid oxide fuel cell systems
FR2930296A1 (en) 2008-04-16 2009-10-23 Faurecia Sys Echappement Exhaust line for engine unit of motor vehicle, has communication opening with heat exchanger and purification unit, where internal section of opening is fifty percentages of that of exchanger perpendicular to gas flow direction
KR20110071315A (en) * 2009-12-21 2011-06-29 두산인프라코어 주식회사 Egr cooler
FR2981983A1 (en) 2011-10-26 2013-05-03 Peugeot Citroen Automobiles Sa Device for controlling pollution of exhaust gas to exhaust line of diesel engine of vehicle, has recirculation pipe extending from inlet to output upstream to pollution control unit for heating exhaust gas passing via pollution control unit
US20150275825A1 (en) * 2014-03-25 2015-10-01 Halla Visteon Climate Control Corp. Integration of forced egr/egr-pump into egr-cooler

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040055740A1 (en) * 2002-09-20 2004-03-25 Meshenky Steven P. Internally mounted radial flow intercooler for a combustion air charger
US20080020247A1 (en) * 2006-07-20 2008-01-24 Modine Manufacturing Company Compact air preheater for solid oxide fuel cell systems
FR2930296A1 (en) 2008-04-16 2009-10-23 Faurecia Sys Echappement Exhaust line for engine unit of motor vehicle, has communication opening with heat exchanger and purification unit, where internal section of opening is fifty percentages of that of exchanger perpendicular to gas flow direction
KR20110071315A (en) * 2009-12-21 2011-06-29 두산인프라코어 주식회사 Egr cooler
FR2981983A1 (en) 2011-10-26 2013-05-03 Peugeot Citroen Automobiles Sa Device for controlling pollution of exhaust gas to exhaust line of diesel engine of vehicle, has recirculation pipe extending from inlet to output upstream to pollution control unit for heating exhaust gas passing via pollution control unit
US20150275825A1 (en) * 2014-03-25 2015-10-01 Halla Visteon Climate Control Corp. Integration of forced egr/egr-pump into egr-cooler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220260315A1 (en) * 2021-02-15 2022-08-18 Mitsubishi Heavy Industries, Ltd. Heat exchanger

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