EP1934459B1 - Device for distributing recirculated gases and recirculated gas-cooling device comprising one such device - Google Patents

Device for distributing recirculated gases and recirculated gas-cooling device comprising one such device Download PDF

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Publication number
EP1934459B1
EP1934459B1 EP06831260A EP06831260A EP1934459B1 EP 1934459 B1 EP1934459 B1 EP 1934459B1 EP 06831260 A EP06831260 A EP 06831260A EP 06831260 A EP06831260 A EP 06831260A EP 1934459 B1 EP1934459 B1 EP 1934459B1
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EP
European Patent Office
Prior art keywords
gas
flow
component
slots
inlet
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Not-in-force
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EP06831260A
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German (de)
French (fr)
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EP1934459A1 (en
Inventor
Gilles Hamadani
Franck Levy
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Renault SAS
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Renault SAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/71—Multi-way valves
    • 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
    • F02M26/26—Layout, e.g. schematics with coolers having bypasses characterised by details of the bypass valve
    • 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
    • F02M26/51—EGR valves combined with other devices, e.g. with intake valves or compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/70—Flap valves; Rotary valves; Sliding valves; Resilient valves

Definitions

  • the present invention relates to exhaust gas recirculation devices, called recirculated gas, EGR gas, or EGR gas (for exhaust gas recirculation), and EGR gas coolers that include such devices.
  • the invention aims to solve the problem of fouling EGR coolers.
  • the invention proposes for this purpose an EGR gas distribution device, from a motor vehicle engine to a component which defines an inlet orifice and a gas outlet opening opening on the same first plane, an inlet orifice and an outlet orifice towards the component opening on the same second plane parallel to the first plane, and rotary means arranged between the first and second planes, to allow a flow of gas in one direction, and in the opposite direction.
  • the invention also relates to an EGR gas cooler which comprises such a device.
  • the cooler may be of the type comprising a U-shaped heat exchanger.
  • the distribution device is intended to direct the flow of recirculated gas from a motor vehicle engine to a component, for example to a heat exchanger.
  • This distribution device can be part of a recirculated gas cooler, for example an EGR gas cooler which comprises a U-shaped heat exchanger.
  • the device defines an inlet orifice e1 and an outlet orifice s1 of gas opening on the same first plane, an inlet orifice e2 and an outlet orifice s2 to the component 2 opening on the same second plane parallel to the first plane, and rotary means, arranged between the first and second planes, to allow a circulation of gas in a sense, and in the opposite direction.
  • the rotary means for reversing the flow comprise a cylindrical piece 3 rotating around its axis of revolution, the two end faces of which face the first and second planes.
  • the cylindrical part 3 defines ports of communication of the orifices (e1, s1, e2, s2) arranged to allow, according to the angle of rotation of the cylinder part 3, a circulation of the flow of gas in one direction and a circulation of gas in the opposite direction.
  • the cylindrical part 3 can be actuated by any means known to those skilled in the art. An electronic computer will control this actuator.
  • the cylindrical part 3 defines two pairs of lights; the lights (4,5) of the first pair are called “straight” ( figure 1a ), and the lights (6, 7) of the second pair are called “crossed” ( figure 1e ).
  • the gas inlet port e1 and the inlet orifice e2 of the heat exchanger face each other. It is the same for the outlets s1 and s2.
  • the lights (4,5) of the first pair are called straight because they put in communication the orifices which face each other.
  • the light 4 communicates the input ports e1 and e2
  • the light 5 communicates the outlet ports s1 and s2 (see Figures 1a, 1d and 3 ).
  • the lights (6, 7) of the second pair are said to be crossed (see figure 1e ), because they connect the inlet ports to the outlet ports so as to reverse the flow direction of the EGR gas flow in the exchanger.
  • the light 6 puts the inlet orifice e1 into communication with the outlet orifice s2
  • the light 7 puts the output orifice s1 into communication with the inlet orifice e2 (see FIG. figure 1a, 1e , and 4 ).
  • the figure 1b shows, a non-limiting embodiment, in which the lights (4 to 7) have a radius of curvature of way to follow a circle 9 of diameter smaller than the diameter of the cylindrical part 3.
  • This arrangement therefore makes it possible to reverse the flow direction of the EGR gas flow.
  • the rotary means may also be provided to allow the dosing of the EGR gas flow which is intended to recirculate on admission.
  • the advantage is to be able to control the flow of EGR gas, as will a conventional EGR valve.
  • the actuating means of the cylindrical part 3 can be of the proportional type, that is to say that they can rotate the cylindrical part 3 at intermediate rotational angles between the main positions (position of normal flow, reverse flow position). These actuating means thus make it possible to vary the overlap surface between the light and the orifices (e1, e2, s1, s2).
  • a light of each pair can define a section with a declining profile.
  • the lights 6 and 5 have this section with a decreasing profile, that is to say that the upper arc of the profile joins the lower arc, at a sectional end of the light. It is this degressive profile which according to the angle of rotation of the cylindrical part, varies the overlap surface with the orifices (e1, e2, s1, s2).
  • the rotary means may also be provided for passing the exchanger 2; non-limitatively, a cavity 8 may be defined on the face facing the first plane to allow the flow of gas flow from the input e1 directly to the output s1 (see figure 2 ).
  • This cavity 8 may be for example a circular longitudinal groove which follows the curve of the circle 9, and which is of a length for communicating the inlet port e1 with the outlet orifice s1.
  • the groove and the two pairs of lights are arranged in the same circle 9.
  • FIG. 5 A second embodiment is illustrated in Figures 5 to 10 .
  • the cylindrical piece 11 defines two lumens 12 and 13.
  • This cylindrical piece 11 is in a cooler (1) EGR which comprises a heat exchanger 2 arranged in a U-shape ( figure 5 ).
  • the overlap surface can be varied between the two slots (12, 13) and the inlet and outlet ports (e1, e2, s1 and s2), This makes it possible to dose the flow of EGR gas which passes through the exchanger and which is intended to recirculate at the intake.
  • the inlet ports e1 and outlet s1 of the cooler 1 are parallel to each other.
  • the inlet openings e2 and outlet s2 of the exchanger 2 are parallel to each other.
  • the inlet openings e1 and outlet s1 of the cooler 1 are inclined by 90 degrees relative to the inlet orifices e2 and outlet s2 of the exchanger 2.
  • the lights 12 and 13 are parallel to each other and offset a distance at least equal to the overall width of the inlet and outlet ports (e1, e2, s1 and s2) of the cooler 1 or the exchanger 2. Referring to figure 9 , it can be seen in this example that the lights 12 and 13 are offset by a distance d corresponding to the width of the two inlet openings e2 and outlet s2 of the exchanger 2.
  • the lights 12 and 13 made on the cylindrical part 11 are not limiting. We can very well envisage to realize a piercing positioned at each end of each lumen (12, 13). We can thus end up with a light and two holes, or with 4 holes alone (see references 14,15,16,17 of the figure 6 ).
  • Figures 7 to 10 represent the different modes of the distribution device of the exchanger.
  • the circulation of the flow can be done only by the common areas shared by the lights and the orifices. These areas represent the overlapping surfaces.
  • the lumen 12 of the cylindrical part 11 puts in communication the inlet orifice e1 of the cooler and the inlet orifice e2 of the heat exchanger 2.
  • the light 13, for its part, puts in communication the orifice output 2 of the heat exchanger 2 with the outlet orifice s1 of the cooler 1.
  • the flow is then said in the normal direction, and small rotations of the cylindrical part 11 to vary the gas flow.
  • the flow direction of the EGR gas flow is reversed relative to that of the figure 7 .
  • the lumen 12 of the cylindrical part 11 puts in communication the inlet orifice e1 of the cooler and the outlet orifice e2 of the heat exchanger 2.
  • the light 13, for its part, puts in communication the orifice of input e2 of the heat exchanger 2 with the outlet orifice s1 of the cooler 1.
  • the flow is then said in the opposite direction, and small rotations of the cylindrical part 11 can vary the gas flow.
  • none of the lights 12 and 13 connect the orifices (e1, e2, s1, s2).
  • the cylindrical piece 11 is in a so-called closed position. There is no EGR gas circulation.
  • the figure 10 represents the cylindrical part 11 in the bypass position.
  • the lights 12 and 13 connect all the orifices (e1, e2, s1, s2) between them.
  • the flow of EGR gas then passes through the lumens 12 and 13, but does not pass through the heat exchanger 2, because the flow of gas is redirected within the inlet orifices e2 and outlet s2 of the heat exchanger 2.
  • the distribution device according to the invention performs three functions. The first is to reverse the flow of EGR gas flowing through the exchanger to remedy the problem of fouling. The second is to measure the flow of EGR gas. This function is normally performed by an EGR valve. The third is to be able to pass the heat exchanger of the cooler. This function is normally performed by a parallel bypass circuit.
  • the present invention therefore has the advantage of removing components of the EGR line.
  • An additional advantage of the second embodiment is that it is possible to make controlled cooling of the EGR gas flow when its flow rate is at most: between the bypass position and the normal direction of the cylindrical part 11, it is possible to the same flow of EGR gas.
  • the difference lies in the proportion of EGR gas that will be passed over that which will pass through the heat exchanger 2.
  • the actuating means proportionally, one can play on the temperature of the EGR gas which will recirculate to admission.
  • the same controlled cooling can be achieved between the bypass position and the reverse direction of the cylindrical part 11.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

The device has a gas inlet orifice (e1) and a gas outlet orifice (s1) emerging out on one plane. An inlet orifice (e2) and an outlet orifice (s2) emerge out on another plane. A rotating cylindrical part (3) is provided between the two planes, for permitting a circulation of exhaust gas recirculation (EGR) gas in one direction and in a reverse direction. The part (3) rotated around its revolution axis and has end faces provided with respect to the planes. The part (3) defines recesses communicating with the orifices (e1, s1, e2, s2) and is controlled by an actuator.

Description

La présente invention concerne les dispositifs de recirculation de gaz d'échappement, appelé gaz recirculés, gaz RGE, ou encore gaz EGR (pour exhaust gas recirculation), et les refroidisseurs de gaz EGR qui comportent de tels dispositifs.The present invention relates to exhaust gas recirculation devices, called recirculated gas, EGR gas, or EGR gas (for exhaust gas recirculation), and EGR gas coolers that include such devices.

Pour améliorer la dépollution des gaz d'échappement d'un moteur à combustion interne, on a recours à la recirculation de gaz d'échappement dans l'admission, que l'on appelle d'une manière générale circuit EGR. De plus, l'emploi de refroidisseurs spécifiques pour ces gaz permet d'augmenter encore cette dépollution, voir par example le document EP 0 987 427 A1 .To improve the decontamination of the exhaust gas of an internal combustion engine, recirculation of exhaust gas in the intake, which is generally called EGR circuit. Moreover, the use of specific coolers for these gases makes it possible to increase this depollution even more, see for example the document EP 0 987 427 A1 .

Cependant, un problème majeur est que le recirculation des gaz d'échappement entraîne un encrassement important des composants qui se trouvent dans ce circuit EGR. C'est pourquoi on peut procéder à des séances de nettoyage / décrassage en ouvrant complètement la vanne EGR (la vanne EGR régule le débit de gaz EGR qui repart à l'admission) quand le moteur est sur une zone de fonctionnement déterminée. Ce procédé, décrit dans la demande FR2833653 , permet d'éliminer thermiquement les dépôts s'accumulant dans le circuit EGR.However, a major problem is that the recirculation of the exhaust gas leads to a significant fouling of the components that are in this EGR circuit. This is why we can proceed to cleaning / cleaning sessions by fully opening the EGR valve (the EGR valve regulates the flow of EGR gas that starts at the intake) when the engine is on a specific operating zone. This process, described in the application FR2833653 , thermally removes deposits accumulating in the EGR circuit.

Ce problème d'encrassement n'est pourtant pas totalement résolu pour ce qui est du refroidisseur EGR. Le refroidisseur est constamment en fonctionnement, c'est-à-dire qu'il y a toujours un débit d'eau qui traverse l'échangeur. Ce qui se passe alors est que le refroidisseur est parfaitement décrassé à l'entrée lorsque l'on procède à une phase de décrassage, mais les gaz EGR qui sont constamment refroidis ne sont pas assez chaud pour décrasser complètement le refroidisseur EGR, surtout dans la deuxième moitié de l'échangeur eau/gaz EGR.This problem of fouling is not yet completely solved for the EGR cooler. The chiller is constantly in operation, that is to say that there is always a flow of water through the exchanger. What happens then is that the chiller is thoroughly unclogged at the inlet when performing a scrub phase, but the EGR gases that are constantly chilled are not hot enough to completely clean the EGR chiller, especially in the second half of the EGR water / gas heat exchanger.

L'invention vise à résoudre le problème d'encrassement des refroidisseurs EGR.The invention aims to solve the problem of fouling EGR coolers.

L'invention propose dans ce but un dispositif de répartition de gaz EGR, d'un moteur de véhicule automobile vers un composant qui définit un orifice d'entrée et un orifice de sortie de gaz débouchant sur un même premier plan, un orifice d'entrée et un orifice de sortie vers le composant débouchant sur un même deuxième plan parallèle au premier plan, et des moyens rotatifs, disposés entre les premier et deuxième plans, pour permettre une circulation de gaz dans un sens, et dans le sens inverse.The invention proposes for this purpose an EGR gas distribution device, from a motor vehicle engine to a component which defines an inlet orifice and a gas outlet opening opening on the same first plane, an inlet orifice and an outlet orifice towards the component opening on the same second plane parallel to the first plane, and rotary means arranged between the first and second planes, to allow a flow of gas in one direction, and in the opposite direction.

Selon d'autres caractéristiques de l'invention :

  • les moyens rotatifs peuvent être également prévus pour permettre le dosage du débit de gaz EGR destiné à recirculer à l'admission,
  • les moyens rotatifs peuvent comporter une pièce cylindrique tournante autour de son axe de révolution, dont les deux faces d'extrémité se trouvent en regard des premier et deuxième plans, la pièce cylindrique définissant sur ses deux faces des lumières de mise en communication des orifices agencées pour permettre, selon l'angle de rotation de la pièce cylindre, une circulation du flux de gaz dans un sens, une circulation de gaz dans le sens inverse.
  • la pièce cylindrique peut définir deux paires de lumières, les lumières de la première paire étant droites, et les lumières de la deuxième paire étant croisées.
  • les moyens rotatifs peuvent être également prévus pour by passer le composant, par exemple la pièce cylindrique peut définir une cavité sur la face en regard du premier plan pour permettre la circulation du flux de gaz de l'entrée directement vers la sortie.
  • la pièce cylindrique peut comporter deux lumières et en les deux lumières, l'entrée et la sortie de gaz, l'orifice d'entrée et de sortie peuvent être de forme allongée et peuvent être disposés de manière à permettre, selon l'angle de rotation de la pièce cylindrique, une circulation du flux de gaz dans un sens, une circulation de gaz dans le sens inverse, et un bypass du composant.
  • le composant peut être un échangeur thermique.
According to other features of the invention:
  • the rotary means may also be provided to allow the dosing of the flow of EGR gas intended to recirculate on admission,
  • the rotary means may comprise a cylindrical piece rotating about its axis of revolution, the two end faces of which are opposite the first and second planes, the cylindrical part defining on its two faces ports for placing the orifices arranged in communication to allow, according to the rotation angle of the cylinder part, a flow of the gas flow in one direction, a flow of gas in the opposite direction.
  • the cylindrical piece can define two pairs of lights, the lights of the first pair being straight, and the lights of the second pair being crossed.
  • the rotating means may also be provided to pass the component, for example the cylindrical part may define a cavity on the face facing the first plane to allow the flow of gas flow from the inlet directly to the outlet.
  • the cylindrical part may comprise two lumens and in both lumens, the gas inlet and outlet, the inlet and outlet orifice may be of elongated shape and may be arranged so as to allow, according to the angle of rotation of the cylindrical part, a flow of the gas flow in one direction, a flow of gas in the opposite direction, and a bypass of the component.
  • the component may be a heat exchanger.

L'invention concerne également un refroidisseur de gaz EGR qui comporte un tel dispositif. Le refroidisseur peut être du type comportant un échangeur thermique en forme de U.The invention also relates to an EGR gas cooler which comprises such a device. The cooler may be of the type comprising a U-shaped heat exchanger.

La présente invention et ses avantages seront mieux compris à la lecture de la description détaillée d'un mode de réalisation pris à titre d'exemple et nullement limitatif, et illustré par les dessins annexés sur lesquels :

  • les figures 1 a, 1b, 1c, 1d et 1e sont des schémas d'un dispositif de répartition selon un premier mode de réalisation,
  • la figure 2 représente la position de la pièce cylindrique en mode by-pass,
  • la figure 3 représente la position de la pièce cylindrique en mode flux normal,
  • la figure 4 représente la position de la pièce cylindrique en mode flux inversé,
  • la figure 5 représente un refroidisseur EGR muni d'un dispositif selon un deuxième mode de réalisation,
  • la figure 6 représente la pièce cylindre selon le deuxième mode de réalisation,
  • la figure 7 représente la position de la pièce cylindrique en mode flux normal,
  • la figure 8 représente la position de la pièce cyli,ndrique en mode flux inversé,
  • la figure 9 représente la position de la pièce cylindrique en mode fermé,
  • la figure 10 représente la position de la pièce cylindrique en mode by-pass.
The present invention and its advantages will be better understood on reading the detailed description of an embodiment taken by way of example and in no way limiting, and illustrated by the appended drawings in which:
  • the FIGS. 1a, 1b, 1c, 1d and 1e are diagrams of a distribution device according to a first embodiment,
  • the figure 2 represents the position of the cylindrical part in bypass mode,
  • the figure 3 represents the position of the cylindrical part in normal flow mode,
  • the figure 4 represents the position of the cylindrical part in reverse flow mode,
  • the figure 5 represents an EGR cooler provided with a device according to a second embodiment,
  • the figure 6 represents the cylinder part according to the second embodiment,
  • the figure 7 represents the position of the cylindrical part in normal flow mode,
  • the figure 8 represents the position of the cyli piece, ndrique in reverse flow mode,
  • the figure 9 represents the position of the cylindrical part in closed mode,
  • the figure 10 represents the position of the cylindrical part in bypass mode.

Le dispositif de répartition est prévu pour diriger le flux de gaz recirculés d'un moteur de véhicule automobile vers un composant, par exemple vers un échangeur thermique. Ce dispositif de répartition peut faire partie d'un refroidisseur de gaz recirculés, par exemple un refroidisseur de gaz EGR qui comporte un échangeur thermique en U.The distribution device is intended to direct the flow of recirculated gas from a motor vehicle engine to a component, for example to a heat exchanger. This distribution device can be part of a recirculated gas cooler, for example an EGR gas cooler which comprises a U-shaped heat exchanger.

D'une manière générale, le dispositif définit un orifice d'entrée e1 et un orifice de sortie s1 de gaz débouchant sur un même premier plan, un orifice d'entrée e2 et un orifice de sortie s2 vers le composant 2 débouchant sur un même deuxième plan parallèle au premier plan, et des moyens rotatifs, disposés entre les premier et deuxième plans, pour permettre une circulation de gaz dans un sens, et dans le sens inverse.In general, the device defines an inlet orifice e1 and an outlet orifice s1 of gas opening on the same first plane, an inlet orifice e2 and an outlet orifice s2 to the component 2 opening on the same second plane parallel to the first plane, and rotary means, arranged between the first and second planes, to allow a circulation of gas in a sense, and in the opposite direction.

Les moyens rotatifs pour inverser le flux comportent une pièce cylindrique 3 tournante autour de son axe de révolution, dont les deux faces d'extrémité se trouvent en regard des premier et deuxième plans. La pièce cylindrique 3 définit des lumières de mise en communication des orifices (e1, s1, e2, s2) agencées pour permettre, selon l'angle de rotation de la pièce cylindre 3, une circulation du flux de gaz dans un sens et une circulation de gaz dans le sens inverse. La pièce cylindrique 3 pourra être actionnée par tout moyen connu de l'homme du métier. Un calculateur électronique commandera cet actionneur.The rotary means for reversing the flow comprise a cylindrical piece 3 rotating around its axis of revolution, the two end faces of which face the first and second planes. The cylindrical part 3 defines ports of communication of the orifices (e1, s1, e2, s2) arranged to allow, according to the angle of rotation of the cylinder part 3, a circulation of the flow of gas in one direction and a circulation of gas in the opposite direction. The cylindrical part 3 can be actuated by any means known to those skilled in the art. An electronic computer will control this actuator.

Selon un premier mode de réalisation illustré aux figures 1 à 4, la pièce cylindrique 3 définit deux paires de lumières ; les lumières (4,5) de la première paire sont dites « droites » (figure 1a), et les lumières (6,7) de la deuxième paire sont dites « croisées » (figure 1e). Dans ce mode de réalisation, en référence à la figure 1 a, l'orifice d'entrée e1 de gaz et l'orifice d'entrée e2 de l'échangeur se font face. Il en est de même pour les orifices de sortie s1 et s2.According to a first embodiment illustrated in Figures 1 to 4 the cylindrical part 3 defines two pairs of lights; the lights (4,5) of the first pair are called "straight" ( figure 1a ), and the lights (6, 7) of the second pair are called "crossed" ( figure 1e ). In this embodiment, with reference to the figure 1 a, the gas inlet port e1 and the inlet orifice e2 of the heat exchanger face each other. It is the same for the outlets s1 and s2.

Les lumières (4,5) de la première paire sont dites droites, car elles mettent en communication les orifices qui se font face. Ainsi la lumière 4 met en communication les orifices d'entrée e1 et e2, et la lumière 5 met en communication les orifices de sortie s1 et s2 (voir figures 1 a, 1d et 3).The lights (4,5) of the first pair are called straight because they put in communication the orifices which face each other. Thus the light 4 communicates the input ports e1 and e2, and the light 5 communicates the outlet ports s1 and s2 (see Figures 1a, 1d and 3 ).

Les lumières (6,7) de la deuxième paire sont dites croisées (voir figure 1e), car elles mettent en communication les orifices d'entrée avec les orifices de sortie de manière à inverser le sens de circulation du flux de gaz EGR dans l'échangeur. Ainsi la lumière 6 met en communication l'orifice d'entrée e1 avec l'orifice de sortie s2, et la lumière 7 met en communication l'orifice de sortie s1 avec l'orifice d'entrée e2 (voir figure 1 a, 1e, et 4).The lights (6, 7) of the second pair are said to be crossed (see figure 1e ), because they connect the inlet ports to the outlet ports so as to reverse the flow direction of the EGR gas flow in the exchanger. Thus, the light 6 puts the inlet orifice e1 into communication with the outlet orifice s2, and the light 7 puts the output orifice s1 into communication with the inlet orifice e2 (see FIG. figure 1a, 1e , and 4 ).

La figure 1b montre, un mode de réalisation non limitatif, dans lequel les lumières (4 à 7) possèdent un rayon de courbure de manière à suivre un cercle 9 de diamètre inférieur au diamètre de la pièce cylindrique 3.The figure 1b shows, a non-limiting embodiment, in which the lights (4 to 7) have a radius of curvature of way to follow a circle 9 of diameter smaller than the diameter of the cylindrical part 3.

Cette disposition permet donc d'inverser le sens de circulation du flux de gaz EGR.This arrangement therefore makes it possible to reverse the flow direction of the EGR gas flow.

Les moyens rotatifs peuvent être également prévus pour permettre le dosage du débit de gaz EGR qui est destiné à recirculer à l'admission. L'avantage est de pouvoir contrôler le débit de gaz EGR, tout comme le ferai une vanne EGR classique.The rotary means may also be provided to allow the dosing of the EGR gas flow which is intended to recirculate on admission. The advantage is to be able to control the flow of EGR gas, as will a conventional EGR valve.

Pour y parvenir, les moyens d'actionnement de la pièce cylindrique 3 peuvent être du type proportionnel, c'est-à-dire qu'ils peuvent faire tourner la pièce cylindrique 3 à des angles de rotation intermédiaires entre les positions principales (position de flux normal, position de flux inversé). Ces moyens d'actionnement permettent ainsi de faire varier la surface de recouvrement entre les lumière et les orifices (e1 ,e2,s1 ,s2).To achieve this, the actuating means of the cylindrical part 3 can be of the proportional type, that is to say that they can rotate the cylindrical part 3 at intermediate rotational angles between the main positions (position of normal flow, reverse flow position). These actuating means thus make it possible to vary the overlap surface between the light and the orifices (e1, e2, s1, s2).

Dans une variante de réalisation non limitative représentée aux figures 1b et 2 à 4, une lumière de chaque paire peut définir une section à profil dégressif. Sur la figure 1b, on peut voir que les lumières 6 et 5 possèdent cette section à profil dégressif, c'est-à-dire que l'arc supérieur du profil vient rejoindre l'arc inférieur, au niveau d'une extrémité de section de la lumière. C'est ce profil dégressif qui selon l'angle de rotation de la pièce cylindrique, fait varier la surface de recouvrement avec les orifices (e1,e2,s1,s2). En pilotant l'angle de rotation de la pièce cylindre 3, on peut faire varier le débit de gaz EGR destiné à recirculer à l'admission aussi bien dans le sens « normal » que dans le sens « inversé » du flux traversant l'échangeur thermique 2.In a variant of non-limiting embodiment represented in figures 1b and 2 to 4 a light of each pair can define a section with a declining profile. On the figure 1b it can be seen that the lights 6 and 5 have this section with a decreasing profile, that is to say that the upper arc of the profile joins the lower arc, at a sectional end of the light. It is this degressive profile which according to the angle of rotation of the cylindrical part, varies the overlap surface with the orifices (e1, e2, s1, s2). By controlling the angle of rotation of the cylinder part 3, it is possible to vary the flow of EGR gas intended to recirculate at the inlet both in the "normal" direction and in the "inverted" direction of the flow passing through the exchanger thermal 2.

Selon une caractéristique supplémentaire de l'invention, les moyens rotatifs peuvent être également prévus pour by passer l'échangeur 2 ; de manière non limitative, une cavité 8 peut être définie sur la face en regard du premier plan pour permettre la circulation du flux de gaz de l'entrée e1 directement vers la sortie s1 (voir figure 2). Cette cavité 8 peut être par exemple une rainure longitudinale circulaire qui suit la courbe du cercle 9, et qui est d'une longueur permettant de mettre en communication l'orifice d'entrée e1 avec l'orifice de sortie s1.According to a further feature of the invention, the rotary means may also be provided for passing the exchanger 2; non-limitatively, a cavity 8 may be defined on the face facing the first plane to allow the flow of gas flow from the input e1 directly to the output s1 (see figure 2 ). This cavity 8 may be for example a circular longitudinal groove which follows the curve of the circle 9, and which is of a length for communicating the inlet port e1 with the outlet orifice s1.

La rainure et les deux paires de lumières sont disposées selon le même cercle 9.The groove and the two pairs of lights are arranged in the same circle 9.

Un deuxième mode de réalisation est illustré aux figures 5 à 10. Comme on peut le voir sur la figure 6, la pièce cylindrique 11 définit deux lumières 12 et 13. Cette pièce cylindrique 11 se trouve dans un refroidisseur (1) EGR qui comporte un échangeur thermique 2 agencé en U (figure 5).A second embodiment is illustrated in Figures 5 to 10 . As can be seen on the figure 6 the cylindrical piece 11 defines two lumens 12 and 13. This cylindrical piece 11 is in a cooler (1) EGR which comprises a heat exchanger 2 arranged in a U-shape ( figure 5 ).

Sur la figure 9 qui représente une vue géométrique de tous les orifices (e1 , s1 , e2, s2) et des lumières (12, 13) lorsque la pièce cylindrique 11 est en position fermée (c'est-à-dire qu'il n'y a pas de circulation de gaz vers l'échangeur 2), on peut voir que les deux lumières 12 et 13, l'entrée e1 et la sortie s1 de gaz, l'orifice d'entrée e2 et de sortie s2 sont de forme allongée rectiligne et, sont disposés de manière à permettre, selon l'angle de rotation de la pièce cylindrique 11, une circulation du flux de gaz dans un sens (figure 7), une circulation de gaz dans le sens inverse (figure 8), et un by-pass de l'échangeur 2 (figure 10).On the figure 9 which represents a geometrical view of all the orifices (e1, s1, e2, s2) and lights (12, 13) when the cylindrical part 11 is in the closed position (that is to say that there is no gas flow to the exchanger 2), it can be seen that the two lights 12 and 13, the inlet e1 and the gas outlet s1, the inlet port e2 and exit s2 are elongated rectilinear and, are arranged so as to allow, according to the angle of rotation of the cylindrical part 11, a flow of the gas flow in one direction ( figure 7 ), a gas flow in the opposite direction ( figure 8 ), and a bypass of the exchanger 2 ( figure 10 ).

En pilotant également l'angle de rotation de la pièce cylindrique 11, on peut faire varier la surface de recouvrement entre les deux lumières (12, 13) et les orifices d'entrée et de sortie (e1, e2, s1 et s2), ce qui permet de doser le débit de gaz EGR qui traverse l'échangeur et qui est destiné à recirculer à l'admission.By also controlling the angle of rotation of the cylindrical part 11, the overlap surface can be varied between the two slots (12, 13) and the inlet and outlet ports (e1, e2, s1 and s2), This makes it possible to dose the flow of EGR gas which passes through the exchanger and which is intended to recirculate at the intake.

Pour y parvenir, les orifices d'entrée e1 et de sortie s1 du refroidisseur 1 sont parallèles entre eux. De même, les orifices d'entrée e2 et de sortie s2 de l'échangeur 2 sont parallèles entre eux. De plus, les orifices d'entrée e1 et de sortie s1 du refroidisseur 1 sont inclinés de 90 degrés par rapport aux orifices d'entrée e2 et de sortie s2 de l'échangeur 2. Les lumières 12 et 13 sont parallèles entre elles et décalées d'une distance au moins égales à la largeur d'encombrement des orifices d'entrée et de sortie (e1, e2, s1 et s2) du refroidisseur 1 ou de l'échangeur 2. En référence à la figure 9, on peut voir dans cet exemple que les lumières 12 et 13 sont décalées d'une distance d correspondant à la largeur des deux orifices d'entrée e2 et de sortie s2 de l'échangeur 2.To achieve this, the inlet ports e1 and outlet s1 of the cooler 1 are parallel to each other. Similarly, the inlet openings e2 and outlet s2 of the exchanger 2 are parallel to each other. In addition, the inlet openings e1 and outlet s1 of the cooler 1 are inclined by 90 degrees relative to the inlet orifices e2 and outlet s2 of the exchanger 2. The lights 12 and 13 are parallel to each other and offset a distance at least equal to the overall width of the inlet and outlet ports (e1, e2, s1 and s2) of the cooler 1 or the exchanger 2. Referring to figure 9 , it can be seen in this example that the lights 12 and 13 are offset by a distance d corresponding to the width of the two inlet openings e2 and outlet s2 of the exchanger 2.

Les lumières 12 et 13 réalisées sur la pièce cylindrique 11 ne sont pas limitatives. On peut très bien envisager de réaliser un perçage positionné à chaque extrémité de chaque lumière (12, 13). On peut ainsi se retrouver avec une lumière et deux perçage, ou encore avec 4 perçages seuls (voir les références 14,15,16,17 de la figure 6).The lights 12 and 13 made on the cylindrical part 11 are not limiting. We can very well envisage to realize a piercing positioned at each end of each lumen (12, 13). We can thus end up with a light and two holes, or with 4 holes alone (see references 14,15,16,17 of the figure 6 ).

Les dessins géométriques des figures 7 à 10 représentent les différents modes du dispositif de répartition de l'échangeur. La circulation du flux ne peut se faire que par les zones communes partagées par les lumières et les orifices. Ces zones représentent les surfaces de recouvrement.The geometric designs of Figures 7 to 10 represent the different modes of the distribution device of the exchanger. The circulation of the flow can be done only by the common areas shared by the lights and the orifices. These areas represent the overlapping surfaces.

Comme illustré à la figure 7, la lumière 12 de la pièce cylindrique 11 met en communication l'orifice d'entrée e1 du refroidisseur et l'orifice d'entrée e2 de l'échangeur thermique 2. La lumière 13, quant à elle, met en communication l'orifice de sortie s2 de l'échangeur thermique 2 avec l'orifice de sortie s1 du refroidisseur 1. Le flux est alors dit dans le sens normal, et de faibles rotations de la pièce cylindrique 11 permettent de varier le débit de gaz.As illustrated in figure 7 the lumen 12 of the cylindrical part 11 puts in communication the inlet orifice e1 of the cooler and the inlet orifice e2 of the heat exchanger 2. The light 13, for its part, puts in communication the orifice output 2 of the heat exchanger 2 with the outlet orifice s1 of the cooler 1. The flow is then said in the normal direction, and small rotations of the cylindrical part 11 to vary the gas flow.

Sur la figure 8, le sens de circulation du flux de gaz EGR est inversé par rapport à celui de la figure 7. La lumière 12 de la pièce cylindrique 11 met en communication l'orifice d'entrée e1 du refroidisseur et l'orifice de sortie e2 de l'échangeur thermique 2. La lumière 13, quant à elle, met en communication l'orifice d'entrée e2 de l'échangeur thermique 2 avec l'orifice de sortie s1 du refroidisseur 1. Le flux est alors dit dans le sens inverse, et de faibles rotations de la pièce cylindrique 11 permettent de varier le débit de gaz.On the figure 8 , the flow direction of the EGR gas flow is reversed relative to that of the figure 7 . The lumen 12 of the cylindrical part 11 puts in communication the inlet orifice e1 of the cooler and the outlet orifice e2 of the heat exchanger 2. The light 13, for its part, puts in communication the orifice of input e2 of the heat exchanger 2 with the outlet orifice s1 of the cooler 1. The flow is then said in the opposite direction, and small rotations of the cylindrical part 11 can vary the gas flow.

En référence à la figure 9, aucune des lumières 12 et 13 ne mettent en relation les orifices (e1,e2,s1 ,s2). La pièce cylindrique 11 est dans une position dite fermée. Il n'y a pas de circulation de gaz EGR.With reference to the figure 9 none of the lights 12 and 13 connect the orifices (e1, e2, s1, s2). The cylindrical piece 11 is in a so-called closed position. There is no EGR gas circulation.

La figure 10 représente la pièce cylindrique 11 en position de by-pass. Les lumières 12 et 13 mettent en relation tous les orifices (e1,e2,s1,s2) entre eux. Le flux de gaz EGR traverse alors les lumières 12 et 13, mais ne traversent pas l'échangeur thermique 2, car le flux de gaz est redirigé au sein même des orifices d'entrée e2 et de sortie s2 de l'échangeur thermique 2.The figure 10 represents the cylindrical part 11 in the bypass position. The lights 12 and 13 connect all the orifices (e1, e2, s1, s2) between them. The flow of EGR gas then passes through the lumens 12 and 13, but does not pass through the heat exchanger 2, because the flow of gas is redirected within the inlet orifices e2 and outlet s2 of the heat exchanger 2.

Un des avantages est que le dispositif de répartition selon l'invention réalise trois fonctions. La première consiste à inverser le flux de gaz EGR qui circule dans l'échangeur pour remédier au problème d'encrassement. La deuxième consiste à doser le flux de gaz EGR. Cette fonction est normalement réalisée par une vanne EGR. La troisième consiste à pouvoir by passer l'échangeur thermique du refroidisseur. Cette fonction est normalement réalisée par un circuit de by-pass parallèle. La présente invention présente donc l'avantage de supprimer des composants de la ligne EGR.One of the advantages is that the distribution device according to the invention performs three functions. The first is to reverse the flow of EGR gas flowing through the exchanger to remedy the problem of fouling. The second is to measure the flow of EGR gas. This function is normally performed by an EGR valve. The third is to be able to pass the heat exchanger of the cooler. This function is normally performed by a parallel bypass circuit. The present invention therefore has the advantage of removing components of the EGR line.

Un avantage supplémentaire du deuxième mode de réalisation est qu'il est possible de faire du refroidissement contrôlé du flux de gaz EGR lorsque son débit est au maximum : entre la position de by-pass et de sens normal de la pièce cylindrique 11 , on conserve le même débit de gaz EGR. La différence réside dans la proportion de gaz EGR qui va être by passée par rapport à celle qui va traverser l'échangeur thermique 2. Ainsi, en pilotant les moyens d'actionnement de manière proportionnelle, on peut jouer sur la température des gaz EGR qui vont recirculer à l'admission. On peut réaliser le même refroidissement contrôlé entre la position by-pass et la position sens inverse de la pièce cylindrique 11.An additional advantage of the second embodiment is that it is possible to make controlled cooling of the EGR gas flow when its flow rate is at most: between the bypass position and the normal direction of the cylindrical part 11, it is possible to the same flow of EGR gas. The difference lies in the proportion of EGR gas that will be passed over that which will pass through the heat exchanger 2. Thus, by controlling the actuating means proportionally, one can play on the temperature of the EGR gas which will recirculate to admission. The same controlled cooling can be achieved between the bypass position and the reverse direction of the cylindrical part 11.

Claims (10)

  1. Device for distributing exhaust gases in a motor vehicle engine to a component (2), characterized in that it defines an inlet port (e1) and an outlet port (s1) for gas opening onto one and the same first plane, an inlet port (e2) and an outlet port (s2) towards the component (2) opening onto one and the same second plane parallel to the first plane, and rotary means, positioned between the first and second planes, to allow gas to flow in one direction and in the opposite direction.
  2. Device according to Claim 1, characterized in that the rotary means are also designed to allow metering of the flow rate of gas intended to be recirculated to the inlet side.
  3. Device according to Claim 1 or 2, characterized in that the rotary means comprise a cylindrical piece (3; 11) rotating about its axis of revolution, the two end faces of which lie facing the first and second planes, the cylindrical piece (3; 11) defining on its two faces slots for allowing the ports (e1, s1, e2, s2) to communicate, these slots being designed so that depending on the angle through which the cylindrical piece (3; 11) is rotated, they allow the gas to flow in one direction or the gas to flow in the opposite direction.
  4. Device according to Claim 3, characterized in that the cylindrical piece (3) define two pairs (4, 5; 6, 7) of slots, the slots (4, 5) of the first pair being straight and the slots (6, 7) of the second pair being crossed.
  5. Device according to any one of the preceding claims, characterized in that the rotary means are also designed to bypass the component (2).
  6. Device according to Claim 5, characterized in that a cavity (8) is defined on the face facing the first plane so as to allow the gas to flow directly from the inlet (e1) to the outlet (s1) without passing through the component (2).
  7. Device according to Claim 3, characterized in that the cylindrical piece (11) comprises two slots (12, 13), and in that the two slots (12, 13), the gas inlet (e1) and the gas outlet (s1), the inlet port (e2) and the outlet port (s2) leading to the component (2) are of elongate shape and are positioned in such a way as to allow, depending on the angle through which the cylindrical piece (11) is rotated, the gas to flow in one direction, the gas to flow in the opposite direction, or the component (2) to be bypassed.
  8. Device according to any one of the preceding claims, characterized in that the component (2) is a heat exchanger.
  9. Recirculated gas cooler (1), characterized in that it comprises a distribution device according to any one of Claims 1 to 8.
  10. Cooler (1) according to Claim 9, characterized in that it comprises a heat exchanger (2) arranged in the shape of a U.
EP06831260A 2005-09-30 2006-10-02 Device for distributing recirculated gases and recirculated gas-cooling device comprising one such device Not-in-force EP1934459B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0552971A FR2891591A1 (en) 2005-09-30 2005-09-30 Recirculated gas distribution device for e.g. exhaust gas recirculation gas cooler, has rotating cylindrical part provided between two planes for permitting circulation of gas in one direction and in reverse direction
PCT/FR2006/050974 WO2007039701A1 (en) 2005-09-30 2006-10-02 Device for distributing recirculated gases and recirculated gas-cooling device comprising one such device

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EP1934459A1 EP1934459A1 (en) 2008-06-25
EP1934459B1 true EP1934459B1 (en) 2009-12-23

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EP (1) EP1934459B1 (en)
JP (1) JP4949402B2 (en)
AT (1) ATE453046T1 (en)
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DE602006011349D1 (en) 2010-02-04
FR2891591A1 (en) 2007-04-06
US7770563B2 (en) 2010-08-10
US20080216802A1 (en) 2008-09-11
EP1934459A1 (en) 2008-06-25
ATE453046T1 (en) 2010-01-15
JP2009510319A (en) 2009-03-12
WO2007039701A1 (en) 2007-04-12
JP4949402B2 (en) 2012-06-06

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