WO2008029043A1 - Gas distribution device for an egr circuit, cooler and control method - Google Patents

Gas distribution device for an egr circuit, cooler and control method Download PDF

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Publication number
WO2008029043A1
WO2008029043A1 PCT/FR2007/051816 FR2007051816W WO2008029043A1 WO 2008029043 A1 WO2008029043 A1 WO 2008029043A1 FR 2007051816 W FR2007051816 W FR 2007051816W WO 2008029043 A1 WO2008029043 A1 WO 2008029043A1
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WO
WIPO (PCT)
Prior art keywords
gas
outlet
chamber
orifice
exchanger
Prior art date
Application number
PCT/FR2007/051816
Other languages
French (fr)
Inventor
Bernard Rollet
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 WO2008029043A1 publication Critical patent/WO2008029043A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/71—Multi-way valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities
    • 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

Definitions

  • Gas distribution device for an EGR circuit, cooler and control method for an EGR circuit, cooler and control method.
  • the present invention relates to exhaust gas recirculation devices, called recirculated exhaust gas GER or gas EGR (English Exhaust Gas Recirculated), and more particularly the EGR gas devices which comprise a cooler.
  • recirculated exhaust gas GER gas EGR
  • EGR American Exhaust Gas Recirculated
  • the use of a gas cooler on the EGR circuit makes it possible to further increase the clearance.
  • a known scrubbing method of FR 2833653 uses the EGR gases themselves, sent in large quantities, when the engine is in a determined operating zone.
  • the cooler poses a particular problem. Being in permanent operation, the cooler is victim of its effectiveness. Indeed, the superheated EGR gas perfectly cleans the first half of the cooler on the side of the inlet, but during the passage of the cooler its cooling action is such that the gas is not hot enough to effectively clean the second half.
  • the present invention provides an alternative device advantageously responding to this problem.
  • the invention relates to an EGR gas dispensing device, simple to control, for performing both the reversal of gas flow direction and the short circuit function.
  • An advantage of the device according to the invention is to allow an improved flow of gas through the device and a better permeability.
  • Another advantage of the device according to the invention is to make it possible to produce a compact cooler performing the function of reversing direction and the short-circuit function.
  • Another advantage, related to the structure of the device, is to allow a simplification of the control.
  • FIG. 1 is a perspective view of the dispensing device according to the invention
  • FIG. 2-5 schematically show the device according to the invention in four remarkable positions, the flaps being oriented respectively at 0 °, 90 °, 180 ° and 270 °,
  • FIG. 6 shows a perspective view of an exchanger
  • Figure 7 shows in perspective view an ERG gas cooler according to the invention.
  • FIG. 1 is a perspective view of a gas distribution device 1 for an EGR circuit according to the invention.
  • the device 1 comprises a substantially cylindrical body 2 of circular section comprising a substantially cylindrical curved wall delimiting an internal cavity 7.
  • the curved wall 2 ends on one side with a first circular end 9 and on the other side with a second end 10 circular.
  • the cylindrical cavity 7 is cut in a diametral plane by a rectangular dividing wall 11.
  • This separating wall 11 thus divides the cylindrical cavity 7 into a first chamber 12 and a second chamber 13 which are semi-cylindrical.
  • This separating wall 11 stops against the inside of the curved wall 8 on the one hand and at the level of the planes respectively delimited by the first 9 and second 10 circular ends on the other hand.
  • the device 1 further comprises two gas distribution orifices 5, 6 disposed in the curved wall 8.
  • the first dispensing orifice 5 pierces the curved wall 8 and opens into the first chamber 12, while the second dispensing orifice 6 pierces the curved wall 8 and opens into the second chamber 13.
  • the device 1 further comprises an inlet 3 connected to the first circular end 9 of the body 2 and an outlet 4 connected to the second circular end of the body 2.
  • the device 1 further comprises distribution means 14, 15 EGR gas comprising a first flap 14 in the form of a plane angular sector partially covering the first planar circular end 9 and a second flap 15 in the form of a plane angular sector partially covering the second flat circular end.
  • each of the flaps 14, 15 is mutually parallel and arranged perpendicularly to the separating wall 11, to coincide each with respectively the first 9 and the second 10 circular ends.
  • the two flaps 14, 15 can rotate about the axis 16 of the cylindrical body 2.
  • the two flaps 14, 15 are arranged angularly opposite relative to said axis 16.
  • each of the flaps 14, 15 remains in contact with one side of the separating wall 11.
  • the two sides of the separating wall 11 in respective contact with one of the flaps 14, 15 are opposite and are the sides which are not in contact with the curved wall 8.
  • the flaps 14, 15 are angular sectors coinciding with the circle of the ends 9, 10.
  • the opening angle of this angular sector is preferably equal to or greater than 180 °.
  • a permanent short-circuit tolerant device can be constructed with an angle of less than 180 °.
  • An angle greater than 180 ° makes it possible to ensure a progressivity of the control during the rotation of the flaps 14, 15.
  • those skilled in the art comprises that an angular sector of X 0 superimposable with a flap 14, 15, and integral with the partition wall 11, allows by performing a covering with said flap 14, 15, to produce a device equivalent to a flap having an angle of 180 + X °.
  • the first flap 14 and the second flap 15 are hemicircular (have an angle of 180 °). All figures represent flaps 14, 15 hemicir vides. The rotation of the flaps 14, 15 around the axis 16 allows them to be oriented. Four remarkable orientations will be described in connection with Figures 2-5 showing a simplified diagram of the device 1.
  • the simplification retains only the body 2 shown by its ends 9, 10 and its generatrices, the separating wall 11 and the flaps 14, 15 mobile.
  • the flaps 14, 15 opposite have a common plane of symmetry 17 which rotates about the axis 16 with the flaps 14, 15. The value of the angle between this plane of symmetry 17 and the fixed dividing wall 11 describes the configuration of the device 1.
  • the device 1 is in a configuration identical to that of FIG. 1.
  • the flaps 14, 15 are oriented in such a way that their common plane of symmetry 17 is parallel, here merged, with the separating wall 11 in a "0 °" position.
  • the inlet 3 is in communication with the two chambers 12, 13 and likewise the outlet 4 is in communication with the two chambers 12, 13.
  • the two orifices 5, 6 each opening into one of the chambers 12, 13 are therefore also in communication with the inlet 3 and the outlet 4.
  • the gas EGR arriving through the inlet 3 can therefore flow directly to the outlet 4 or to one or other of the distribution orifices 5, 6.
  • This configuration is called short-circuit, in that it places in direct communication the input 3 and the output 4.
  • the device 1 is in a configuration where the flaps 14, 15 are oriented such that their common plane of symmetry 17 is perpendicular to the separating wall 11, in a position called "90 °".
  • the second chamber 13 is closed by the first flap 14 on the side of the inlet 3.
  • the inlet 3 communicates only with the first chamber 12, into which the first dispensing orifice 5 opens.
  • the EGR gas arriving through the inlet 3 must necessarily flow towards the first dispensing orifice 5.
  • the first 5 and second dispensing orifice 6 are advantageously connected to one another by an exchanger as will be described later. The EGR gas then flows out through the first orifice 5 to return to the device 1 through the second orifice 6.
  • the EGR gas enters the second chamber 13.
  • the second flap 15 closes the first chamber 12 on the side of the outlet 4.
  • the second chamber 13 communicates alone with the outlet 4, through which the gas can flow.
  • the EGR gas flows from the inlet 3 to the outlet 4 via the two orifices 5, 6 and flows from the first orifice 5 to the second orifice 6 in a first direction.
  • the device 1 is in a configuration where the flaps 14, 15 are oriented such that their common plane of symmetry 17 is parallel / coincident, to the separating wall 11, in a "180 °" position.
  • the input 3 is in communication with the two chambers 12, 13 and likewise the output 4 is in communication with the two chambers 12, 13.
  • the two orifices 5, 6 opening each into one of the chambers 12 , 13 are therefore also in communication with the inlet 3 and the outlet 4.
  • the EGR gas arriving through the inlet 3 can therefore flow directly to the outlet 4 or to one or the other of the distribution orifices 5, 6
  • This configuration is a second so-called short-circuit configuration, in that it places in direct communication the input 3 and the output 4.
  • the device 1 is in a configuration where the flaps 14, 15 are oriented such that their common plane of symmetry 17 is perpendicular to the separating wall 11, in a position called "270 °".
  • the first chamber 12 is closed by the first flap 14 of the side of the inlet 3.
  • the inlet 3 communicates only with the second chamber 13, into which the second dispensing orifice 6 opens.
  • the EGR gas arriving through the inlet 3 must necessarily flow to the second dispensing orifice 6.
  • the first 5 and second dispensing orifice 6 are advantageously connected by an exchanger as will be described later.
  • the EGR gas then flows out through the second port 6 to return to the device 1 through the first port 5. Through this first port 5 the EGR gas enters the first chamber 12.
  • the second flap 15 closes the second chamber 13 on the side of the outlet 4.
  • the first chamber 12 communicates alone with the outlet 4, through which the gas can flow.
  • the EGR gas flows from the inlet 3 to the outlet 4 via the two orifices 5, 6 and flows from the second orifice 6 to the first orifice 5 in a direction opposite to the first direction of the "90 °" configuration.
  • an exchanger In order to cool the EGR gas, an exchanger is conventionally used.
  • An illustrative exchanger 19 is described in connection with FIG. 6.
  • Such an exchanger 19 comprises a body 23, here prismatic.
  • a plurality of pipes 24, only one of which is shown completely, passing through the body 23 allow the transport, inside said pipes 24, of the EGR gas between a first end 22 and a second end 28 of the body 23.
  • the volume included in FIG. the body 23 is immersed in a heat transfer fluid, bathing the external surfaces of the pipes 24 to cool the EGR gas, without direct contact with the gas.
  • a circulation of coolant which may advantageously be brine, is obtained by renewal of said fluid by means of the pipes 25, 26 opening into the interior of the body 23.
  • a first portion of the pipes 24, here a half, is used to convey the gas in one direction, for example from the first end 22 to the second end 28, while the second part of the pipes 24 is used to convey the gas in the opposite direction, or from the second end 28 to the first end 22.
  • these two parts of pipes are respectively associated with a first outlet 20 and a second outlet 21 of the exchanger 19.
  • These two exits 20, 21 are for example defined by an element of pipe 30, separated by a separating wall 29.
  • a turning cavity 27 provides communication between the pipes of the first part and the pipes of the second part.
  • the EGR gas can flow from the first outlet 20 to the cavity 27, then from the cavity 27 to the second outlet 21.
  • the EGR gas can flow in the opposite direction, the second outlet 21 to the cavity 27, then the cavity 27 to the first outlet 20. Whatever the direction of flow, the gas carries two passes through the body 23 during which it is cooled.
  • the invention also relates to a cooler 18 constructed by assembling a device 1 according to the invention with an exchanger. In relation to FIG. 7 is described such an assembly of a dispensing device 1 with an exchanger 19 of the type previously described. Such an assembly is carried out by connecting the first orifice 5 of the device 1 to the first outlet 20 of the exchanger 19 and the second orifice 6 of the device 1 to the second outlet 21 of the exchanger 19. In the illustrated example, this connection is performed by aligning the first outlet 20 with the first chamber 12 and the second outlet 21 with the second chamber 13.
  • the heat exchanger is shaped into "U" in such a way that its first outlet 20 and its second outlet 21 open into the same plane 22.
  • the gas distribution device 1 is then arranged so that the separating wall 11 of the device 1 is perpendicular to said plane 22 and in the extension of the separating wall 29 of the exchanger 19.
  • a connecting piece 33 here provides the double connection.
  • the orifices 5, 6 formed in the curved wall 8, which are relatively small in the representation of FIG. 1, can be enlarged until each occupies the entire projected surface of the outlet 20, respectively 21 on the body 2 of the device 1, as shown in Figure 7 for the present case, a quarter of the cylinder.
  • Figure 7 illustrates a device 1 in 90 ° configuration.
  • the gas entering through the inlet 3, along the arrow 31, enters the first chamber 12, through the first orifice 5, to reach the first outlet 20. It then flows back and forth through the exchanger 19 to exit through the second exit 21. Next to the arrow 32, it then enters through the second orifice 6 in the second chamber 13 to finally exit through the outlet 4.
  • the invention also relates to a method of controlling a distribution device 1 or a cooler 18 comprising such a device 1. Said method controls the orientation of the flaps 14, 15 in order to achieve the various configurations described above.
  • Each flap 14, 15 can be mobilized by an independent actuator.
  • a single actuator may advantageously rotate the two flaps 14, 15, for example secured by a shaft merging with the axis 16.
  • the actuator may be a four-position actuator for performing configurations 0 °, 90 °, 180 ° and 270 °.
  • the control method of a cooler 18 advantageously uses the 90 ° configuration to obtain a flow of gas in a first direction through the exchanger 19 / cooler 18.
  • the 270 ° configuration allows to obtain a flow of gas in another direction, inverse of the first.
  • a circulation of superheated EGR gas is used in a "scrubbing" mode.
  • the process alternately uses the 90 ° and 270 ° positions in order to remove one half of the exchanger 19 on the side of one of the exits 20, 21 and then the other half of the exchanger 19 on the other side. from the other issue.
  • the control method places the flaps 14, 15 in one of the 0 ° or 180 ° short-circuit positions, in order to effect a flow of gas directly between the inlet 3 and the outlet 4, by short-circuiting the exchanger 19 when it is not necessary or desirable to cool the gas.
  • the device 1 or the cooler 18, by its conformation, is advantageously driven by orienting the flaps 14, 15 by a rotation that can be performed in return or preferably always in the same direction. Thus rotation in a single direction ensures the alternation between the positions "in operation" 90 ° and 270 °.
  • the interposition of a short-circuit configuration (0 ° and 180 °) between two configurations "in operation" can quickly achieve a short circuit.
  • the actuator may also be a proportional actuator for controlling the flaps 14, 15 in intermediate positions that are not limited to the 0 °, 90 °, 180 ° or 270 ° positions, in order to distribute a portion of gas flowing in the exchanger 19 and a portion of gas bypassing the exchanger 19, in a variable distribution depending on the orientation of the flaps 14, 15 to obtain a gas cooling proportional to said distribution.

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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)

Abstract

The invention relates to a gas distribution device (1) for an EGR circuit comprising a cylindrical body (2) diametrically intersected by a dividing wall (11) dividing it into two chambers (12, 13), a first distribution orifice (5) opening into the first chamber (12), a second distribution orifice (6) opening into the second chamber (13), an inlet (3) positioned in a first flat circular end (9) of the body (2) and an outlet (4) positioned in a second flat circular end (10) of the body (2) and distribution means (14, 15) comprising a first (14) and a second (15) flap in the form of an angular sector, these being positioned at right angles to the dividing wall (11), angularly opposite each other and able to turn while at the same time remaining in contact with an opposite side of the dividing wall (11). This device makes it possible to reverse the direction of flow through an associated heat exchanger or to short-circuit said exchanger.

Description

Dispositif de distribution de gaz pour un circuit EGR, refroidisseur et procédé de commande . Gas distribution device for an EGR circuit, cooler and control method.
La présente invention concerne les dispositifs de recirculation de gaz d'échappement, appelé gaz d'échappement recirculé GER ou encore gaz EGR (de l'anglais Exhaust Gaz Recirculated) , et plus particulièrement les dispositifs de gaz EGR qui comportent un refroidisseur. Pour améliorer la dépollution du gaz d'échappement d'un moteur à combustion interne, il est connu de rediriger le gaz d'échappement dans l'admission, par un circuit appelé de manière générale circuit EGR. L'emploi d'un refroidisseur de gaz sur le circuit EGR permet d'augmenter encore la dépollution.The present invention relates to exhaust gas recirculation devices, called recirculated exhaust gas GER or gas EGR (English Exhaust Gas Recirculated), and more particularly the EGR gas devices which comprise a cooler. To improve the depollution of the exhaust gas of an internal combustion engine, it is known to redirect the exhaust gas in the intake, by a circuit generally called EGR circuit. The use of a gas cooler on the EGR circuit makes it possible to further increase the clearance.
Cependant, un problème majeur est que la recirculation des gaz d'échappement entraîne un encrassement important des composants se trouvant dans le circuit EGR. Il est connu pour y remédier de procéder à des séances de nettoyage / décrassage thermique éliminant les dépôts s 'accumulant dans le circuit EGR. Un procédé de décrassage connu de FR 2833653 utilise les gaz EGR eux-mêmes, envoyés en grande quantité, lorsque le moteur est dans une zone de fonctionnement déterminée. Cependant le refroidisseur pose un problème particulier. Etant en fonctionnement permanent, le refroidisseur est victime de son efficacité. En effet, le gaz EGR surchauffé décrasse parfaitement la première moitié du refroidisseur du côté de l'entrée, mais lors de la traversée du refroidisseur son action refroidissante est telle que le gaz n'est plus assez chaud pour décrasser efficacement la seconde moitié. Il est connu de GB 2418012, d'inverser le sens de circulation des gaz EGR dans un refroidisseur, en croisant l'entrée et la sortie, afin de décrasser tout le refroidisseur. Un autre problème se pose à faible charge, ou lorsque le moteur est froid comme par exemple au démarrage, et que les gaz EGR sont trop froids. Afin d'améliorer la combustion et de limiter les émissions polluantes d'hydrocarbure et d'oxydes de carbone, il ne convient pas de refroidir davantage les gaz. Il est connu de US 6634419, US 5617726 ou US 6367256 d'utiliser un court-circuit afin que le gaz EGR évite le refroidisseur en le contournant. Les brevets FR 0552968 et FR 0552970 au nom du demandeur proposent des solutions avantageuses pour réaliser une telle inversion et un tel court-circuit.However, a major problem is that the recirculation of the exhaust gases leads to significant fouling of the components in the EGR circuit. It is known to remedy this to carry out cleaning / thermal scrubbing sessions eliminating deposits accumulating in the EGR circuit. A known scrubbing method of FR 2833653 uses the EGR gases themselves, sent in large quantities, when the engine is in a determined operating zone. However the cooler poses a particular problem. Being in permanent operation, the cooler is victim of its effectiveness. Indeed, the superheated EGR gas perfectly cleans the first half of the cooler on the side of the inlet, but during the passage of the cooler its cooling action is such that the gas is not hot enough to effectively clean the second half. It is known from GB 2418012, to reverse the flow direction of the EGR gas in a cooler, crossing the inlet and outlet, to clean all the cooler. Another problem arises at low load, or when the engine is cold as for example at startup, and the EGR gas is too cold. In order to improve the combustion and to limit the polluting emissions of hydrocarbon and oxides of carbon, it is not advisable to cool the gases further. It is known from US 6634419, US 5617726 or US 6367256 to use a short circuit so that the EGR gas avoids the cooler bypassing it. Patents FR 0552968 and FR 0552970 in the name of the applicant propose advantageous solutions to achieve such an inversion and such a short circuit.
La présente invention propose un dispositif alternatif répondant avantageusement à ce problème. L'invention a pour objet un dispositif de distribution de gaz EGR, simple à commander, permettant de réaliser tant l'inversion de sens de circulation du gaz que la fonction court-circuit .The present invention provides an alternative device advantageously responding to this problem. The invention relates to an EGR gas dispensing device, simple to control, for performing both the reversal of gas flow direction and the short circuit function.
Un avantage du dispositif selon l'invention est de permettre un écoulement amélioré du gaz au travers du dispositif et une meilleure perméabilité.An advantage of the device according to the invention is to allow an improved flow of gas through the device and a better permeability.
Un autre avantage du dispositif selon l'invention est de permettre de réaliser un refroidisseur compact réalisant la fonction d'inversion de sens et la fonction court-circuit.Another advantage of the device according to the invention is to make it possible to produce a compact cooler performing the function of reversing direction and the short-circuit function.
Un autre avantage, lié à la structure du dispositif, est de permettre une simplification de la commande .Another advantage, related to the structure of the device, is to allow a simplification of the control.
D'autres caractéristiques, détails et avantages de l'invention ressortiront plus clairement de la description détaillée donnée ci-après à titre indicatif en relation avec des dessins sur lesquels : - la figure 1 représente en vue perspective le dispositif de distribution selon l'invention,Other characteristics, details and advantages of the invention will emerge more clearly from the detailed description given below as an indication in relation to drawings in which: FIG. 1 is a perspective view of the dispensing device according to the invention,
- les figures 2-5 représentent schématiquement le dispositif selon l'invention dans quatre positions remarquables, les volets étant orientés respectivement à 0°, 90°, 180° et 270°,- Figures 2-5 schematically show the device according to the invention in four remarkable positions, the flaps being oriented respectively at 0 °, 90 °, 180 ° and 270 °,
- la figure 6 représente en vue perspective un échangeur, la figure 7 représente en vue perspective un refroidisseur de gaz ERG selon l'invention.- Figure 6 shows a perspective view of an exchanger, Figure 7 shows in perspective view an ERG gas cooler according to the invention.
La figure 1 représente en vue perspective un dispositif de distribution 1 de gaz pour un circuit EGR selon l'invention. Le dispositif 1 comprend un corps 2 sensiblement cylindrique de section circulaire comprenant une paroi courbe sensiblement cylindrique délimitant une cavité intérieure 7. La paroi courbe 2 se termine d'un côté par une première extrémité 9 circulaire et de l'autre côté par une seconde extrémité 10 circulaire. La cavité 7 cylindrique est coupée selon un plan diamétral par une paroi séparatrice 11 rectangulaire. Cette paroi séparatrice 11 divise ainsi la cavité cylindrique 7 en une première chambre 12 et une seconde chambre 13 hémicylindriques. Cette paroi séparatrice 11 s'arrête contre l'intérieur de la paroi courbe 8 d'une part et au niveau des plans respectivement délimités par les première 9 et seconde 10 extrémités circulaires d'autre part. Le dispositif 1 comprend encore deux orifices 5, 6 de distribution de gaz disposés dans la paroi courbe 8. Le premier orifice 5 de distribution perce la paroi courbe 8 et débouche dans la première chambre 12, tandis que le second orifice 6 de distribution perce la paroi courbe 8 et débouche dans la seconde chambre 13. Le dispositif 1 comprend encore une entrée 3 connectée à la première extrémité 9 circulaire du corps 2 et une sortie 4 connectée à la seconde extrémité 10 circulaire du corps 2. Le dispositif 1 comprend encore des moyens de répartition 14, 15 des gaz EGR comprenant un premier volet 14 en forme de secteur angulaire plan recouvrant partiellement la première extrémité 9 circulaire plane et un second volet 15 en forme de secteur angulaire plan recouvrant partiellement la seconde extrémité 10 circulaire plane. Ces deux volets 14, 15 sont parallèles entre eux et disposés perpendiculairement à la paroi séparatrice 11, afin de coïncider chacun avec respectivement la première 9 et la seconde 10 extrémités circulaires. Les deux volets 14, 15 peuvent tourner autour de l'axe 16 du corps 2 cylindrique. Les deux volets 14, 15 sont disposés angulairement opposés relativement audit axe 16. Ainsi, au cours de la rotation conjointe et simultanée autour de l'axe 16, chacun des volets 14, 15 reste en contact avec un côté de la paroi séparatrice 11. Les deux côtés de la paroi séparatrice 11 en contact respectif avec un des volets 14, 15 sont opposés et sont les côtés qui ne sont pas en contact avec la paroi courbe 8.FIG. 1 is a perspective view of a gas distribution device 1 for an EGR circuit according to the invention. The device 1 comprises a substantially cylindrical body 2 of circular section comprising a substantially cylindrical curved wall delimiting an internal cavity 7. The curved wall 2 ends on one side with a first circular end 9 and on the other side with a second end 10 circular. The cylindrical cavity 7 is cut in a diametral plane by a rectangular dividing wall 11. This separating wall 11 thus divides the cylindrical cavity 7 into a first chamber 12 and a second chamber 13 which are semi-cylindrical. This separating wall 11 stops against the inside of the curved wall 8 on the one hand and at the level of the planes respectively delimited by the first 9 and second 10 circular ends on the other hand. The device 1 further comprises two gas distribution orifices 5, 6 disposed in the curved wall 8. The first dispensing orifice 5 pierces the curved wall 8 and opens into the first chamber 12, while the second dispensing orifice 6 pierces the curved wall 8 and opens into the second chamber 13. The device 1 further comprises an inlet 3 connected to the first circular end 9 of the body 2 and an outlet 4 connected to the second circular end of the body 2. The device 1 further comprises distribution means 14, 15 EGR gas comprising a first flap 14 in the form of a plane angular sector partially covering the first planar circular end 9 and a second flap 15 in the form of a plane angular sector partially covering the second flat circular end. These two flaps 14, 15 are mutually parallel and arranged perpendicularly to the separating wall 11, to coincide each with respectively the first 9 and the second 10 circular ends. The two flaps 14, 15 can rotate about the axis 16 of the cylindrical body 2. The two flaps 14, 15 are arranged angularly opposite relative to said axis 16. Thus, during simultaneous and simultaneous rotation about the axis 16, each of the flaps 14, 15 remains in contact with one side of the separating wall 11. The two sides of the separating wall 11 in respective contact with one of the flaps 14, 15 are opposite and are the sides which are not in contact with the curved wall 8.
Comme le montre la figure 1, les volets 14, 15 sont des secteurs angulaires coïncidant avec le cercle des extrémités 9, 10. L'angle d'ouverture de ce secteur angulaire est avantageusement égal ou supérieur à 180°. Il est à noter qu'un dispositif tolérant un court-circuit permanent peut être construit avec un angle inférieur à 180°. Un angle supérieur à 180° permet d'assurer une progressivité de la commande lors de la rotation des volets 14, 15. De manière équivalente, l'homme du métier comprend qu'un secteur angulaire de X0 superposable avec un volet 14, 15, et solidaire de la paroi séparatrice 11, permet en réalisant un recouvrement avec ledit volet 14, 15, de produire un dispositif équivalent à un volet présentant un angle de 180+X°.As shown in Figure 1, the flaps 14, 15 are angular sectors coinciding with the circle of the ends 9, 10. The opening angle of this angular sector is preferably equal to or greater than 180 °. It should be noted that a permanent short-circuit tolerant device can be constructed with an angle of less than 180 °. An angle greater than 180 ° makes it possible to ensure a progressivity of the control during the rotation of the flaps 14, 15. Equally, those skilled in the art comprises that an angular sector of X 0 superimposable with a flap 14, 15, and integral with the partition wall 11, allows by performing a covering with said flap 14, 15, to produce a device equivalent to a flap having an angle of 180 + X °.
Selon un mode de réalisation avantageux le premier volet 14 et le second volet 15 sont hemicirculaires (présentent un angle de 180°). Toutes les figures représentent des volets 14, 15 hemicirculaires. La rotation des volets 14, 15 autour de l'axe 16 permet de les orienter. Quatre orientations remarquables vont être décrites en relation avec les figures 2-5 représentant un schéma simplifié du dispositif 1. La simplification conserve uniquement le corps 2 figuré par ses extrémités 9, 10 et ses génératrices, la paroi séparatrice 11 et les volets 14, 15 mobiles. Les volets 14, 15 opposés présentent un plan de symétrie commun 17 qui tourne autour de l'axe 16 avec les volets 14, 15. La valeur de l'angle entre ce plan de symétrie 17 et la paroi séparatrice 11 fixe décrit la configuration du dispositif 1.According to an advantageous embodiment the first flap 14 and the second flap 15 are hemicircular (have an angle of 180 °). All figures represent flaps 14, 15 hemicirculaires. The rotation of the flaps 14, 15 around the axis 16 allows them to be oriented. Four remarkable orientations will be described in connection with Figures 2-5 showing a simplified diagram of the device 1. The simplification retains only the body 2 shown by its ends 9, 10 and its generatrices, the separating wall 11 and the flaps 14, 15 mobile. The flaps 14, 15 opposite have a common plane of symmetry 17 which rotates about the axis 16 with the flaps 14, 15. The value of the angle between this plane of symmetry 17 and the fixed dividing wall 11 describes the configuration of the device 1.
Ainsi, à la figure 2, le dispositif 1 est dans une configuration identique à celle de la figure 1. Les volets 14, 15 sont orientés de telle manière que leur plan de symétrie 17 commun soit parallèle, ici confondu, à la paroi séparatrice 11, en une position "0°". Dans cette configuration, l'entrée 3 est en communication avec les deux chambres 12, 13 et de même la sortie 4 est en communication avec les deux chambres 12, 13. Les deux orifices 5, 6 débouchant chacun dans une des chambres 12, 13 sont donc aussi en communication avec l'entrée 3 et la sortie 4. Le gaz EGR arrivant par l'entrée 3 peut donc circuler directement vers la sortie 4 ou vers l'un ou l'autre des orifices de distribution 5, 6. Cette configuration est dite court-circuit, en ce qu'elle place en communication directe l'entrée 3 et la sortie 4. A la figure 3, le dispositif 1 est dans une configuration où les volets 14, 15 sont orientés de telle manière que leur plan de symétrie 17 commun soit perpendiculaire, à la paroi séparatrice 11, en une position dite "90°". Dans cette configuration, la seconde chambre 13 est obturée par le premier volet 14 du côté de l'entrée 3. L'entrée 3 communique uniquement avec la première chambre 12, dans laquelle débouche le premier orifice de distribution 5. Le gaz EGR arrivant par l'entrée 3 doit nécessairement circuler vers le premier orifice de distribution 5. Les premier 5 et second orifice 6 de distribution sont avantageusement connectés l'un à l'autre par un échangeur comme il sera décrit plus loin. Le gaz EGR circule alors en sortant par le premier orifice 5 pour revenir dans le dispositif 1 par le second orifice 6. Par ce second orifice 6 le gaz EGR pénètre dans la seconde chambre 13. Le second volet 15 obture la première chambre 12 du côté de la sortie 4. La seconde chambre 13 communique seule avec la sortie 4, par laquelle le gaz peut s'écouler. Dans cette configuration, le gaz EGR s'écoule de l'entrée 3 jusqu'à la sortie 4 via les deux orifices 5, 6 et circule du premier orifice 5 vers le second orifice 6 dans un premier sens.Thus, in FIG. 2, the device 1 is in a configuration identical to that of FIG. 1. The flaps 14, 15 are oriented in such a way that their common plane of symmetry 17 is parallel, here merged, with the separating wall 11 in a "0 °" position. In this configuration, the inlet 3 is in communication with the two chambers 12, 13 and likewise the outlet 4 is in communication with the two chambers 12, 13. The two orifices 5, 6 each opening into one of the chambers 12, 13 are therefore also in communication with the inlet 3 and the outlet 4. The gas EGR arriving through the inlet 3 can therefore flow directly to the outlet 4 or to one or other of the distribution orifices 5, 6. This configuration is called short-circuit, in that it places in direct communication the input 3 and the output 4. A Figure 3, the device 1 is in a configuration where the flaps 14, 15 are oriented such that their common plane of symmetry 17 is perpendicular to the separating wall 11, in a position called "90 °". In this configuration, the second chamber 13 is closed by the first flap 14 on the side of the inlet 3. The inlet 3 communicates only with the first chamber 12, into which the first dispensing orifice 5 opens. The EGR gas arriving through the inlet 3 must necessarily flow towards the first dispensing orifice 5. The first 5 and second dispensing orifice 6 are advantageously connected to one another by an exchanger as will be described later. The EGR gas then flows out through the first orifice 5 to return to the device 1 through the second orifice 6. Through this second orifice 6 the EGR gas enters the second chamber 13. The second flap 15 closes the first chamber 12 on the side of the outlet 4. The second chamber 13 communicates alone with the outlet 4, through which the gas can flow. In this configuration, the EGR gas flows from the inlet 3 to the outlet 4 via the two orifices 5, 6 and flows from the first orifice 5 to the second orifice 6 in a first direction.
A la figure 4, le dispositif 1 est dans une configuration où les volets 14, 15 sont orientés de telle manière que leur plan de symétrie 17 commun soit parallèle/confondu, à la paroi séparatrice 11, en une position "180°". Dans cette configuration, similaire à la configuration "0°", l'entrée 3 est en communication avec les deux chambres 12, 13 et de même la sortie 4 est en communication avec les deux chambres 12, 13. Les deux orifices 5, 6 débouchant chacun dans une des chambres 12, 13 sont donc aussi en communication avec l'entrée 3 et la sortie 4. Le gaz EGR arrivant par l'entrée 3 peut donc circuler directement vers la sortie 4 ou vers l'un ou l'autre des orifices de distribution 5, 6. Cette configuration est une seconde configuration dite court- circuit, en ce qu'elle place en communication directe l'entrée 3 et la sortie 4.In FIG. 4, the device 1 is in a configuration where the flaps 14, 15 are oriented such that their common plane of symmetry 17 is parallel / coincident, to the separating wall 11, in a "180 °" position. In this configuration, similar to the configuration "0 °", the input 3 is in communication with the two chambers 12, 13 and likewise the output 4 is in communication with the two chambers 12, 13. The two orifices 5, 6 opening each into one of the chambers 12 , 13 are therefore also in communication with the inlet 3 and the outlet 4. The EGR gas arriving through the inlet 3 can therefore flow directly to the outlet 4 or to one or the other of the distribution orifices 5, 6 This configuration is a second so-called short-circuit configuration, in that it places in direct communication the input 3 and the output 4.
A la figure 5, le dispositif 1 est dans une configuration où les volets 14, 15 sont orientés de telle manière que leur plan de symétrie 17 commun soit perpendiculaire, à la paroi séparatrice 11, en une position dite "270°". Dans cette configuration, la première chambre 12 est obturée par le premier volet 14 du côte de l'entrée 3. L'entrée 3 communique uniquement avec la seconde chambre 13, dans laquelle débouche le second orifice de distribution 6. Le gaz EGR arrivant par l'entrée 3 doit nécessairement circuler vers le second orifice de distribution 6. Les premier 5 et second orifice 6 de distribution sont avantageusement connectés par un échangeur comme il sera décrit plus loin. Le gaz EGR circule alors en sortant par le second orifice 6 pour revenir dans le dispositif 1 par le premier orifice 5. Par ce premier orifice 5 le gaz EGR pénètre dans la première chambre 12. Le second volet 15 obture la seconde chambre 13 du côté de la sortie 4. La première chambre 12 communique seule avec la sortie 4, par laquelle le gaz peut s'écouler. Dans cette configuration, le gaz EGR s'écoule de l'entrée 3 jusqu'à la sortie 4 via les deux orifices 5, 6 et circule du second orifice 6 vers le premier orifice 5 dans un sens inverse du premier sens de la configuration "90°".In Figure 5, the device 1 is in a configuration where the flaps 14, 15 are oriented such that their common plane of symmetry 17 is perpendicular to the separating wall 11, in a position called "270 °". In this configuration, the first chamber 12 is closed by the first flap 14 of the side of the inlet 3. The inlet 3 communicates only with the second chamber 13, into which the second dispensing orifice 6 opens. The EGR gas arriving through the inlet 3 must necessarily flow to the second dispensing orifice 6. The first 5 and second dispensing orifice 6 are advantageously connected by an exchanger as will be described later. The EGR gas then flows out through the second port 6 to return to the device 1 through the first port 5. Through this first port 5 the EGR gas enters the first chamber 12. The second flap 15 closes the second chamber 13 on the side of the outlet 4. The first chamber 12 communicates alone with the outlet 4, through which the gas can flow. In this configuration, the EGR gas flows from the inlet 3 to the outlet 4 via the two orifices 5, 6 and flows from the second orifice 6 to the first orifice 5 in a direction opposite to the first direction of the "90 °" configuration.
Afin de refroidir le gaz EGR, un échangeur est classiquement utilisé. Un échangeur 19 îllustratif est décrit en relation avec la figure 6. Un tel échangeur 19 comprend un corps 23, ici prismatique. Une pluralité de tuyauteries 24, dont une seule est représentée complètement, traversant le corps 23 permettent le transport, à l'intérieur desdites tuyauteries 24, du gaz EGR entre une première extrémité 22 et une seconde extrémité 28 du corps 23. Le volume compris dans le corps 23 est baigné dans un fluide caloporteur, baignant les surfaces externes des tuyauteries 24 afin de refroidir le gaz EGR, sans contact direct avec le gaz. Une circulation de fluide caloporteur, qui peut avantageusement être de l'eau glycolée, est obtenue par renouvellement dudit fluide au moyen des canalisations 25, 26 débouchant dans l'intérieur du corps 23. Une première partie des tuyauteries 24, ici une moitié, est utilisée pour véhiculer le gaz dans un sens, par exemple de la première extrémité 22 vers la seconde extrémité 28, tandis que la seconde partie des tuyauteries 24 est utilisée pour véhiculer le gaz dans le sens inverse, soit de la seconde extrémité 28 vers la première extrémité 22. Du côté de la première extrémité 22, ces deux parties de tuyauteries sont respectivement associées à une première issue 20 et à une seconde issue 21 de l' échangeur 19. Ces deux issues 20, 21 sont par exemple délimitées par un élément de canalisation 30, sépare par une paroi séparatrice 29. Du côté de la seconde extrémité 28, une cavité de retournement 27 assure une communication entre les tuyauteries de la première partie et les tuyauteries de la seconde partie. Ainsi le gaz EGR peut circuler de la première issue 20 vers la cavité 27, puis de la cavité 27 vers la seconde issue 21. Alternativement, le gaz EGR peut circuler en sens inverse, de la seconde issue 21 vers la cavité 27, puis de la cavité 27 vers la première issue 20. Quelque soit le sens de circulation, le gaz effectue deux traversées du corps 23 durant lesquelles il est refroidi. L'invention concerne encore un refroidisseur 18 construit par assemblage d'un dispositif 1 selon l'invention avec un échangeur. En relation avec la figure 7 est décrit un tel assemblage d'un dispositif de distribution 1 avec un échangeur 19 du type précédemment décrit. Un tel assemblage est effectué en connectant le premier orifice 5 du dispositif 1 à la première issue 20 de 1 'échangeur 19 et le second orifice 6 du dispositif 1 à la seconde issue 21 de l' échangeur 19. Dans l'exemple illustré cette connexion est effectuée en alignant la première issue 20 avec la première chambre 12 et la seconde issue 21 avec la seconde chambre 13. En adaptant, la connexion et la localisation des orifices 5, 6 aux deux issues 20, 21 de 1 'échangeur, il est possible d'associer le dispositif 1 à tout type d'échangeur. Selon un mode de réalisation particulièrement avantageux illustré aux figures 6 et 7, l' échangeur est conformé en "U" de telle manière que sa première issue 20 et sa seconde issue 21 débouchent dans un même plan 22. Le dispositif 1 de distribution de gaz est alors disposé de manière à ce que la paroi séparatrice 11 du dispositif 1 soit perpendiculaire audit plan 22 et dans le prolongement de la paroi séparatrice 29 de l' échangeur 19. Une pièce de jonction 33 assure ici la double connexion. Les orifices 5, 6 pratiqués dans la paroi courbe 8, relativement réduits dans la représentation de la figure 1, peuvent être agrandis jusqu'à occuper chacun toute la surface projetée de l'issue 20, respectivement 21 sur le corps 2 du dispositif 1, soit comme illustré à la figure 7 pour le cas présent, un quart du cylindre.In order to cool the EGR gas, an exchanger is conventionally used. An illustrative exchanger 19 is described in connection with FIG. 6. Such an exchanger 19 comprises a body 23, here prismatic. A plurality of pipes 24, only one of which is shown completely, passing through the body 23 allow the transport, inside said pipes 24, of the EGR gas between a first end 22 and a second end 28 of the body 23. The volume included in FIG. the body 23 is immersed in a heat transfer fluid, bathing the external surfaces of the pipes 24 to cool the EGR gas, without direct contact with the gas. A circulation of coolant, which may advantageously be brine, is obtained by renewal of said fluid by means of the pipes 25, 26 opening into the interior of the body 23. A first portion of the pipes 24, here a half, is used to convey the gas in one direction, for example from the first end 22 to the second end 28, while the second part of the pipes 24 is used to convey the gas in the opposite direction, or from the second end 28 to the first end 22. On the side of the first end 22, these two parts of pipes are respectively associated with a first outlet 20 and a second outlet 21 of the exchanger 19. These two exits 20, 21 are for example defined by an element of pipe 30, separated by a separating wall 29. On the second end 28, a turning cavity 27 provides communication between the pipes of the first part and the pipes of the second part. Thus the EGR gas can flow from the first outlet 20 to the cavity 27, then from the cavity 27 to the second outlet 21. Alternatively, the EGR gas can flow in the opposite direction, the second outlet 21 to the cavity 27, then the cavity 27 to the first outlet 20. Whatever the direction of flow, the gas carries two passes through the body 23 during which it is cooled. The invention also relates to a cooler 18 constructed by assembling a device 1 according to the invention with an exchanger. In relation to FIG. 7 is described such an assembly of a dispensing device 1 with an exchanger 19 of the type previously described. Such an assembly is carried out by connecting the first orifice 5 of the device 1 to the first outlet 20 of the exchanger 19 and the second orifice 6 of the device 1 to the second outlet 21 of the exchanger 19. In the illustrated example, this connection is performed by aligning the first outlet 20 with the first chamber 12 and the second outlet 21 with the second chamber 13. By adapting, the connection and the location of the orifices 5, 6 to the two exits 20, 21 of the exchanger, it is possible to associate the device 1 with any type of exchanger. According to a particularly advantageous embodiment illustrated in FIGS. 6 and 7, the heat exchanger is shaped into "U" in such a way that its first outlet 20 and its second outlet 21 open into the same plane 22. The gas distribution device 1 is then arranged so that the separating wall 11 of the device 1 is perpendicular to said plane 22 and in the extension of the separating wall 29 of the exchanger 19. A connecting piece 33 here provides the double connection. The orifices 5, 6 formed in the curved wall 8, which are relatively small in the representation of FIG. 1, can be enlarged until each occupies the entire projected surface of the outlet 20, respectively 21 on the body 2 of the device 1, as shown in Figure 7 for the present case, a quarter of the cylinder.
La figure 7 illustre un dispositif 1 en configuration 90°. Le gaz pénétrant par l'entrée 3, suivant la flèche 31, pénètre dans la première chambre 12, pour, au travers du premier orifice 5, atteindre la première issue 20. Il traverse ensuite aller/retour 1 ' échangeur 19 pour ressortir par la seconde issue 21. Suivant la flèche 32, il pénètre ensuite par le second orifice 6 dans la seconde chambre 13 pour finalement sortir par la sortie 4.Figure 7 illustrates a device 1 in 90 ° configuration. The gas entering through the inlet 3, along the arrow 31, enters the first chamber 12, through the first orifice 5, to reach the first outlet 20. It then flows back and forth through the exchanger 19 to exit through the second exit 21. Next to the arrow 32, it then enters through the second orifice 6 in the second chamber 13 to finally exit through the outlet 4.
L'invention concerne encore un procédé de pilotage d'un dispositif de distribution 1 ou d'un refroidisseur 18 comportant un tel dispositif 1. Ledit procédé commande l'orientation des volets 14, 15 afin de réaliser les différentes configurations décrites précédemment. Chaque volet 14, 15 peut être mobilise par un actionneur indépendant. Un actionneur unique peut avantageusement entraîner en rotation les deux volets 14, 15, par exemple solidarisés par un arbre se confondant avec l'axe 16. L 'actionneur peut être un actionneur a quatre positions permettant de réaliser les configurations 0°, 90°, 180° et 270°.The invention also relates to a method of controlling a distribution device 1 or a cooler 18 comprising such a device 1. Said method controls the orientation of the flaps 14, 15 in order to achieve the various configurations described above. Each flap 14, 15 can be mobilized by an independent actuator. A single actuator may advantageously rotate the two flaps 14, 15, for example secured by a shaft merging with the axis 16. The actuator may be a four-position actuator for performing configurations 0 °, 90 °, 180 ° and 270 °.
Le procédé de pilotage d'un refroidisseur 18 utilise avantageusement la configuration 90° pour obtenir une circulation de gaz dans un premier sens au travers de 1 ' échangeur 19/refroidisseur 18. Alternativement la configuration 270° permet d'obtenir une circulation de gaz dans un autre sens, inverse du premier.The control method of a cooler 18 advantageously uses the 90 ° configuration to obtain a flow of gas in a first direction through the exchanger 19 / cooler 18. Alternatively the 270 ° configuration allows to obtain a flow of gas in another direction, inverse of the first.
Lorsque le refroidisseur est utilisé normalement, en mode "nominal", afin de refroidir le gaz EGR, le gaz au cours de sa circulation provoque un encrassement du refroidisseur . Une utilisation alternée dans le temps des positions 90° et 270° permet avantageusement de répartir dans l'échangeur 19 l'encrassement causé par le gaz. Ceci entraîne un encrassement mieux réparti donc plus faible, nécessitant des décrassages moins fréquents.When the chiller is used normally, in "nominal" mode, to cool the EGR gas, the gas during its circulation causes clogging of the chiller. An alternating use over time of the 90 ° and 270 ° positions advantageously makes it possible to distribute in the exchanger 19 the fouling caused by the gas. This results in a better distributed fouling so lower, requiring less frequent removal.
Lorsque le refroidisseur 18 et le circuit EGR en général doit être décrassé, une circulation de gaz EGR surchauffée est employée selon un mode "décrassage". Dans ce mode "décrassage", le procède utilise alternativement les positions 90° et 270° afin de décrasser une moitié de l'échangeur 19 du côté d'une des issues 20, 21 puis l'autre moitié de l'échangeur 19 du côté de l'autre issue .When the cooler 18 and the EGR circuit in general has to be cleaned, a circulation of superheated EGR gas is used in a "scrubbing" mode. In this "scrubbing" mode, the process alternately uses the 90 ° and 270 ° positions in order to remove one half of the exchanger 19 on the side of one of the exits 20, 21 and then the other half of the exchanger 19 on the other side. from the other issue.
Le procédé de pilotage place les volets 14, 15 dans l'une des positions court-circuit 0° ou 180°, afin de réaliser une circulation de gaz directement entre l'entrée 3 et la sortie 4, en court-circuitant l'échangeur 19 lorsqu'il n'est pas nécessaire ou souhaitable de refroidir le gaz. Le dispositif 1 ou le refroidisseur 18, de par sa conformation, est avantageusement pilote en orientant les volets 14, 15 par une rotation pouvant être effectuée en aller/retour ou avantageusement toujours dans le même sens. Ainsi rotation dans un unique sens assure l'alternance entre les positions "en fonctionnement" 90° et 270°. De plus la présence intercalaire d'une configuration court-circuit (0° et 180°) entre deux configurations "en fonctionnement" permet de réaliser rapidement un court-circuit .The control method places the flaps 14, 15 in one of the 0 ° or 180 ° short-circuit positions, in order to effect a flow of gas directly between the inlet 3 and the outlet 4, by short-circuiting the exchanger 19 when it is not necessary or desirable to cool the gas. The device 1 or the cooler 18, by its conformation, is advantageously driven by orienting the flaps 14, 15 by a rotation that can be performed in return or preferably always in the same direction. Thus rotation in a single direction ensures the alternation between the positions "in operation" 90 ° and 270 °. In addition, the interposition of a short-circuit configuration (0 ° and 180 °) between two configurations "in operation" can quickly achieve a short circuit.
L ' actionneur peut aussi être un actionneur proportionnel permettant de piloter les volets 14, 15 dans des positions intermédiaires non limitées aux positions 0°, 90°, 180° ou 270°, afin de distribuer une partie de gaz circulant dans l'echangeur 19 et une partie de gaz court-circuitant l'echangeur 19, selon une répartition variable fonction de l'orientation des volets 14, 15 afin d'obtenir un refroidissement de gaz proportionnel à ladite répartition. The actuator may also be a proportional actuator for controlling the flaps 14, 15 in intermediate positions that are not limited to the 0 °, 90 °, 180 ° or 270 ° positions, in order to distribute a portion of gas flowing in the exchanger 19 and a portion of gas bypassing the exchanger 19, in a variable distribution depending on the orientation of the flaps 14, 15 to obtain a gas cooling proportional to said distribution.

Claims

REVENDICATIONS
1. Dispositif de distribution (1) de gaz pour un circuit EGR, comprenant un corps (2), une entrée (3), une sortie (4), un premier orifice (5) de distribution, un second orifice (6) de distribution et des moyens de répartition du gaz (14, 15), caractérisé en ce que le corps (2) comprend une paroi courbe (8) sensiblement cylindrique délimitant une cavité intérieure (7) et présentant une première (9) et une seconde extrémités (10) circulaires planes, ladite cavité (7) étant diamétralement coupée par une paroi séparatrice (11) rectangulaire divisant la cavité (7) en une première chambre (12) et une seconde chambre (13), en ce que le premier (5) et le second (6) orifices de distribution sont disposés dans ladite paroi courbe (8), le premier orifice (5) de distribution débouchant dans la première chambre (12), le second orifice (6) de distribution débouchant dans la seconde chambre (13), en ce que l'entrée (3) est disposée dans la première extrémité (9) circulaire plane du corps (2) et la sortie (4) est disposée dans la seconde extrémité (10) circulaire plane du corps (2) et en ce que les moyens de répartition comprennent un premier volet (14) en forme de secteur angulaire plan recouvrant partiellement la première extrémité (9) circulaire plane et un second volet (15) en forme de secteur angulaire plan recouvrant partiellement la seconde extrémité (10) circulaire plane, disposés perpendiculairement à la paroi séparatrice (11), angulairement opposes l'un à l'autre relativement à l'axe (16) du cylindre, et pouvant tourner autour dudit axe (16), en restant en contact chacun respectivement avec un côté opposé de la paroi séparatrice (11).A gas dispensing device (1) for an EGR circuit, comprising a body (2), an inlet (3), an outlet (4), a first orifice (5) for dispensing, a second orifice (6) for distribution and gas distribution means (14, 15), characterized in that the body (2) comprises a substantially cylindrical curved wall (8) delimiting an interior cavity (7) and having a first (9) and a second end Circular cavity (10), said cavity (7) being diametrically cut by a rectangular dividing wall (11) dividing the cavity (7) into a first chamber (12) and a second chamber (13), in that the first chamber (5) ) and the second (6) dispensing orifices are arranged in said curved wall (8), the first dispensing opening (5) opening into the first chamber (12), the second dispensing orifice (6) opening into the second chamber (13), in that the inlet (3) is arranged in the circular first end (9) planar body (2) and the outlet (4) is disposed in the second end (10) circular plane of the body (2) and in that the distribution means comprise a first flap (14) in the form of plane angular sector covering partially the first planar circular end (9) and a second plane-shaped flat sector portion (15) partially covering the second flat circular end (10), arranged perpendicularly to the separating wall (11), angularly opposed to each other; other relative to the axis (16) of the cylinder, and rotatable about said axis (16), each remaining in contact with a respective opposite side of the separating wall (11).
2. Dispositif (1) selon la revendication 1, où le premier (14) et le second volet (15) couvrent chacun un angle d'au moins 180°. 2. Device (1) according to claim 1, wherein the first (14) and the second flap (15) each cover an angle of at least 180 °.
3. Dispositif selon la revendication 2, où le premier (14) et le second volet (15) sont hemicirculaires .3. Device according to claim 2, wherein the first (14) and the second flap (15) are hemicirculaires.
4. Dispositif selon l'une quelconque des revendications 1 à 3, où les volets (14, 15) sont orientés de telle manière que leur plan de symétrie (17) commun soit parallèle à la paroi séparatrice (11), en une position "O0", où l'entrée (3), la sortie (4), le premier orifice (5) de distribution et le second orifice (6) de distribution sont en communication. 4. Device according to any one of claims 1 to 3, wherein the flaps (14, 15) are oriented such that their common plane of symmetry (17) is parallel to the separating wall (11), in a position " O 0 ", where the inlet (3), the outlet (4), the first orifice (5) of distribution and the second orifice (6) of distribution are in communication.
5. Dispositif selon l'une quelconque des revendications 1 à 3, où les volets (14, 15) sont orientés de telle manière que leur plan de symétrie (17) commun soit perpendiculaire à la paroi séparatrice (11) afin que le premier volet (14) ferme la seconde chambre (13) et que le second volet (15) ferme la première chambre (12), en une position "90°", où l'entrée (3) est en communication avec le premier orifice (5) de distribution et la sortie (4) est en communication avec le second orifice (6) de distribution. 5. Device according to any one of claims 1 to 3, wherein the flaps (14, 15) are oriented in such a way that their common plane of symmetry (17) is perpendicular to the separating wall (11) so that the first flap (14) closes the second chamber (13) and the second flap (15) closes the first chamber (12) at a "90 °" position, where the inlet (3) is in communication with the first port (5). ) and the outlet (4) is in communication with the second orifice (6) distribution.
6. Dispositif selon l'une quelconque des revendications 1 à 3, ou les volets (14, 15) sont orientés de telle manière que leur plan de symétrie (17) commun soit parallèle à la paroi séparatrice (11), en une position "180°", où l'entrée (3), la sortie (4), le premier orifice (5) de distribution et le second orifice (6) de distribution sont en communication.6. Device according to any one of claims 1 to 3, wherein the flaps (14, 15) are oriented such that their common plane of symmetry (17) is parallel to the separating wall (11), in a position " 180 ° ", where the inlet (3), the outlet (4), the first orifice (5) of distribution and the second orifice (6) of distribution are in communication.
7. Dispositif selon l'une quelconque des revendications 1 à 3, où les volets (14, 15) sont orientés de telle manière que leur plan de symétrie (17) commun soit perpendiculaire à la paroi séparatrice (11) de telle manière que le premier volet (14) ferme la première chambre (12) et que le second volet (15) ferme la seconde chambre (13), en une position "270°" où l'entrée (3) est en communication avec le second orifice (6) de distribution et la sortie (4) est en communication avec le premier orifice (5) de distribution. 7. Device according to any one of Claims 1 to 3, wherein the flaps (14, 15) are oriented such that their common plane of symmetry (17) is perpendicular to the dividing wall (11) so that the first flap (14) closes the first chamber (12) and that the second flap (15) closes the second chamber (13) at a "270 °" position where the inlet (3) is in communication with the second dispensing orifice (6) and the outlet (4). ) is in communication with the first dispensing orifice (5).
8. Refroidisseur (18) de gaz EGR comprenant un échangeur (19) comportant une première (20) et une seconde issues (21), caractérisé en ce qu'il comprend encore un dispositif (1) selon l'une quelconque des revendications 1 à 7, et en ce que le premier orifice (5) de distribution est connecté à la première issue (20) et le second orifice (6) de distribution est connecté à la seconde issue (21).8. EGR gas cooler (18) comprising an exchanger (19) comprising a first (20) and a second outlet (21), characterized in that it further comprises a device (1) according to any one of claims 1 at 7, and in that the first delivery port (5) is connected to the first outlet (20) and the second delivery port (6) is connected to the second outlet (21).
9. Refroidisseur selon la revendication 8, où 1 ' échangeur (19) est conformé en "U" avec ses première (20) et seconde issues (21) débouchant dans un même plan (22) et où le dispositif (1) de distribution de gaz est disposé tel que la paroi séparatrice (11) dudit dispositif (1) soit perpendiculaire audit plan (22).9. Cooler according to claim 8, wherein 1 'exchanger (19) is shaped in "U" with its first (20) and second issues (21) opening into the same plane (22) and wherein the device (1) distribution gas is arranged such that the partition wall (11) of said device (1) is perpendicular to said plane (22).
10. Procédé de pilotage d'un refroidisseur (18) selon l'une quelconque des revendications 8 à 9, ou les volets (14, 15) sont pilotes dans la position 90°, respectivement 270°, afin de produire une circulation de gaz au travers de l' échangeur dans un sens, respectivement dans l'autre sens. 10. A method of controlling a cooler (18) according to any one of claims 8 to 9, or flaps (14, 15) are pilot in the 90 ° position, respectively 270 °, to produce a flow of gas through the exchanger in one direction, respectively in the other direction.
11. Procédé de pilotage selon la revendication 10, où dans un mode nominal, les positions 90° et 270° sont utilisées alternativement afin de répartir dans 1 ' échangeur (19) l'encrassement causé par le gaz.11. A driving method according to claim 10, wherein in a nominal mode, the positions 90 ° and 270 ° are used alternately to distribute in 1 exchanger (19) fouling caused by the gas.
12. Procédé de pilotage selon la revendication 10, où les positions 90° et 270° sont utilisées alternativement afin de décrasser les deux issues de 1' échangeur.12. The driving method according to claim 10, wherein the 90 ° and 270 ° positions are used alternately to clean the two exits of the exchanger.
13. Procédé de pilotage selon l'une quelconque des revendications 10 à 12, où les volets (14, 15) sont pilotés dans la position 0° ou 180°, afin de réaliser une circulation de gaz directement entre l'entrée (3) et la sortie (4), en court-circuitant 1 ' échangeur (19).13. A control method according to any one of claims 10 to 12, wherein the flaps (14, 15) are controlled in the 0 ° or 180 ° position, to achieve a flow of gas directly between the inlet (3) and the outlet (4), bypassing the exchanger (19).
14. Procédé de pilotage selon l'une quelconque des revendications 10 à 13, où les volets (14, 15) sont encore pilotés dans des positions intermédiaires aux positions 0°, 90°, 180° ou 270°, afin de distribuer une partie de gaz circulant dans l' échangeur (19) et une partie de gaz court-circuitant 1 'échangeur (19), pour obtenir un refroidissement proportionnel de gaz. 14. A control method according to any one of claims 10 to 13, wherein the flaps (14, 15) are further driven in intermediate positions at 0 °, 90 °, 180 ° or 270 °, to distribute a portion gas circulating in the exchanger (19) and a gas portion bypassing the exchanger (19), to obtain a proportional cooling of gas.
PCT/FR2007/051816 2006-09-05 2007-08-16 Gas distribution device for an egr circuit, cooler and control method WO2008029043A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0607782A FR2905424B1 (en) 2006-09-05 2006-09-05 GAS DISTRIBUTION DEVICE FOR EGR CIRCUIT, COOLER AND CONTROL METHOD.
FR0607782 2006-09-05

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2303007A1 (en) * 1973-01-22 1974-07-25 Volkswagenwerk Ag VALVE FOR THE CONTROL OF THE RETURNED EXHAUST GAS QUANTITY IN A DEVICE FOR EXHAUST GAS RECIRCULATION
EP0701048A1 (en) * 1994-09-10 1996-03-13 Ford Motor Company Limited A cylinder head
FR2727158A1 (en) * 1994-11-17 1996-05-24 Sagem Allumage Control valve for selective recycling of IC engine exhaust gas
EP0887541A2 (en) * 1997-06-25 1998-12-30 Lucas Industries Public Limited Company Exhast gas recirculation valve
EP1342907A2 (en) * 2002-03-02 2003-09-10 Pierburg GmbH Valve system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2303007A1 (en) * 1973-01-22 1974-07-25 Volkswagenwerk Ag VALVE FOR THE CONTROL OF THE RETURNED EXHAUST GAS QUANTITY IN A DEVICE FOR EXHAUST GAS RECIRCULATION
EP0701048A1 (en) * 1994-09-10 1996-03-13 Ford Motor Company Limited A cylinder head
FR2727158A1 (en) * 1994-11-17 1996-05-24 Sagem Allumage Control valve for selective recycling of IC engine exhaust gas
EP0887541A2 (en) * 1997-06-25 1998-12-30 Lucas Industries Public Limited Company Exhast gas recirculation valve
EP1342907A2 (en) * 2002-03-02 2003-09-10 Pierburg GmbH Valve system

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FR2905424A1 (en) 2008-03-07

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