FR2921434A1 - DEVICE FOR FILTERING THE RECIRCULATION GASES OF A COMBUSTION ENGINE - Google Patents

DEVICE FOR FILTERING THE RECIRCULATION GASES OF A COMBUSTION ENGINE Download PDF

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Publication number
FR2921434A1
FR2921434A1 FR0757876A FR0757876A FR2921434A1 FR 2921434 A1 FR2921434 A1 FR 2921434A1 FR 0757876 A FR0757876 A FR 0757876A FR 0757876 A FR0757876 A FR 0757876A FR 2921434 A1 FR2921434 A1 FR 2921434A1
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FR
France
Prior art keywords
egr valve
filtering device
filtering
gate
recirculation
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
FR0757876A
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French (fr)
Inventor
Johann William
Aurelien Nerriere
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Renault SAS
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Renault SAS
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Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Priority to FR0757876A priority Critical patent/FR2921434A1/en
Priority to EP08300261A priority patent/EP2042723A1/en
Publication of FR2921434A1 publication Critical patent/FR2921434A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/0233—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles periodically cleaning filter by blowing a gas through the filter in a direction opposite to exhaust flow, e.g. exposing filter to engine air intake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/64—Systems for actuating EGR valves the EGR valve being operated together with an intake air throttle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/36—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an exhaust flap
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/12—Metallic wire mesh fabric or knitting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust

Abstract

Dispositif de filtrage de gaz d'échappement prélevés sur le conduit d'échappement (4a) d'un moteur thermique en aval d'un organe de dépollution (6) sous le contrôle d'une vanne EGR (8), pour être envoyés dans une conduite de recirculation (7) vers l'admission du moteur, caractérisé en ce qu'il comporte un organe de filtrage autonettoyant (11) des gaz envoyés en recirculation, dont le fonctionnement est lié à celui de la vanne EGR (8).Exhaust gas filtering device taken from the exhaust pipe (4a) of a heat engine downstream of a pollution control device (6) under the control of an EGR valve (8), to be sent to a recirculation line (7) to the engine intake, characterized in that it comprises a self-cleaning filter member (11) of the recirculating gases, whose operation is linked to that of the EGR valve (8).

Description

DISPOSITIF DE FILTRAGE DES GAZ DE RECIRCULATION D'UN MOTEUR A COMBUSTION La présente invention concerne la dépollution des moteurs à combustion, en particulier des moteurs turbocompressés. Plus précisément, elle se rapporte aux systèmes de recirculation des gaz d'échappement, vers l'admission du moteur, dits systèmes EGR, pour Exhaust Gas Recirculation en anglais, qui permettent notamment de limiter l'émission d'oxydes d'azote, ou NOx. Cette invention a pour objet un dispositif de filtrage de gaz d'échappement prélevés sur le conduit d'échappement d'un moteur thermique en aval d'un organe de dépollution sous le contrôle d'une vanne EGR, pour être envoyés, dans une conduite de recirculation, vers l'admission du moteur. Dans un moteur turbocompressé, le piquage des gaz envoyés en recirculation peut être effectué en amont de la turbine du turbocompresseur. Leur réintroduction dans le circuit d'admission est alors opérée en aval du boîtier de coupure. L'inconvénient majeur de ce type de circuit, dit circuit EGR haute pression , est la limitation du taux d'EGR pour un niveau de pression de suralimentation donné. Le taux d'EGR est en effet déterminé par le différentiel de pression existant entre la pression avant turbine, et la pression dans le collecteur d'admission. Une seconde architecture, dite EGR basse pression , consiste à prélever les gaz d'échappement en - 2 - aval d'un organe de dépollution (tel qu'un filtre à particules) pour avoir des gaz propres, et à les réintroduire en amont du compresseur. Ce type de circuit assure une meilleure perméabilité aux gaz EGR, mais la différence de pression permettant de faire circuler ces gaz est très faible sur une majeure partie de la plage de fonctionnement du moteur. On a donc recours à un volet à l'échappement, placé en aval du piquage EGR, pour générer une contre pression, propre à faciliter la recirculation des gaz d'échappement vers l'admission. Un des inconvénients d'un tel système reste que, des particules solides, dues au vieillissement du filtre à particules, peuvent emprunter le circuit EGR, et être ainsi réintroduites à l'admission. The present invention relates to the depollution of combustion engines, in particular turbocharged engines. More specifically, it relates to exhaust gas recirculation systems, to the engine intake, so-called EGR systems, for Exhaust Gas Recirculation in English, which in particular to limit the emission of nitrogen oxides, or NOx. This invention relates to an exhaust gas filtering device taken from the exhaust pipe of a heat engine downstream of a pollution control member under the control of an EGR valve, to be sent in a pipe recirculation, to the engine intake. In a turbocharged engine, the tapping of the recirculating gases can be carried out upstream of the turbine of the turbocharger. Their reintroduction into the intake circuit is then carried out downstream of the breaking unit. The major disadvantage of this type of circuit, said high pressure EGR circuit, is the limitation of the EGR rate for a given boost pressure level. The EGR rate is in fact determined by the differential pressure existing between the pressure before turbine, and the pressure in the intake manifold. A second architecture, called low-pressure EGR, consists of taking the exhaust gases downstream of a pollution control device (such as a particle filter) to obtain clean gases, and to reintroduce them upstream of the compressor. This type of circuit provides better permeability to EGR gases, but the pressure difference to circulate these gases is very low over a large part of the engine operating range. An exhaust flap, placed downstream of the EGR tap, is therefore used to generate a counterpressure, which can facilitate the recirculation of the exhaust gases towards the intake. One of the drawbacks of such a system remains that, solid particles, due to aging of the particulate filter, can borrow the EGR circuit, and thus be reintroduced admission.

La présente invention vise à éviter l'encrassement du moteur, sans pénaliser la boucle EGR. Dans ce but, elle prévoit de coupler le fonctionnement d'un organe de filtrage autonettoyant des gaz envoyés en recirculation, à celui de la vanne EGR. The present invention aims to prevent fouling of the engine, without penalizing the EGR loop. For this purpose, it provides for coupling the operation of a self-cleaning filter member of the gas sent in recirculation, that of the EGR valve.

De préférence, l'organe de filtrage est couplé mécaniquement à la vanne EGR. Selon un mode de réalisation particulier de l'invention, c'est une grille pivotante, placée à l'entrée de la conduite de recirculation. Preferably, the filtering member is mechanically coupled to the EGR valve. According to a particular embodiment of the invention, it is a pivoting grid placed at the entrance of the recirculation pipe.

D'autres caractéristiques et avantages de la présente invention ressortiront clairement à la lecture de la description suivante d'un mode de réalisation non limitatif de celle-ci, en se reportant aux dessins annexés, sur lesquels : - 3 - - la figure 1 montre schématiquement l'implantation du dispositif dans une architecture EGR, - la figure 2, montre en perspective, un mode de réalisation non limitatif du dispositif, et - les figures 3 et 4 illustrent son fonctionnement. Sur la figure 1, on a représenté un conduit d'admission 1 de moteur turbocompressé, avec son entrée d'air frais 2, et la roue 3 du compresseur. La ligne d'échappement 4 du même moteur (non représenté), présente un filtre à particules 6. Un conduit de recirculation 7 des gaz d'échappement démarre en aval du filtre 6. Le circuit EGR est du type basse pression , puisque les gaz sont prélevés, en aval d'un organe de dépollution 6. La recirculation est commandée par la vanne EGR 8, disposée à l'intérieur du conduit de recirculation 7, qui renvoie les gaz vers l'admission, après avoir traversé un refroidisseur 9. La vanne 8 est placée sous le contrôle du calculateur du moteur (non représenté). Après le départ du conduit 7, le conduit d'échappement 4a porte un volet d'échappement 10, dont la commande permet d'établir, selon les circonstances, la contre pression nécessaire à la bonne recirculation des gaz d'échappement vers l'admission. La figure 1 montre enfin le dispositif de filtrage des gaz d'échappement proposé par l'invention, qui comporte un organe de filtrage, tel qu'une grille autonettoyante 11 dont le fonctionnement est couplé à celui de la vanne EGR 8. Conformément au schéma, l'organe de filtrage peut être constitué par une grille pivotante placée à l'entrée de la conduite de recirculation 7. La grille de filtrage 11 et la vanne EGR 8, peuvent ainsi être couplés mécaniquement par une biellette 12, sans que cette disposition soit obligatoire, car, dans le cadre de l'invention, tout type de liaison de commande entre ces deux éléments peut être mise en oeuvre. Sur la figure 2, qui illustre un mode de réalisation non limitatif de l'invention, on retrouve le volet 8a de la vanne EGR, la grille 11, et la biellette 12. Dans cet exemple de réalisation du dispositif, la biellette 12 est articulée sur deux pattes 13, 15, fixées rigidement sur le support annulaire lia de la grille 11, et sur le volet pivotant 8a de la vanne EGR 8, par exemple au niveau de leurs axes de pivot respectifs. Other features and advantages of the present invention will become clear from reading the following description of a non-limiting embodiment thereof, with reference to the accompanying drawings, in which: FIG. schematically the implementation of the device in an EGR architecture, - Figure 2 shows in perspective, a non-limiting embodiment of the device, and - Figures 3 and 4 illustrate its operation. In Figure 1, there is shown a intake duct 1 turbocharged engine, with its fresh air inlet 2, and the wheel 3 of the compressor. The exhaust line 4 of the same engine (not shown), has a particulate filter 6. A recirculation duct 7 of the exhaust gas starts downstream of the filter 6. The EGR circuit is of the low pressure type, since the gases are taken downstream of a depollution device 6. The recirculation is controlled by the EGR valve 8, disposed inside the recirculation duct 7, which returns the gases to the inlet, after passing through a cooler 9. The valve 8 is placed under the control of the engine computer (not shown). After the departure of the duct 7, the exhaust duct 4a carries an exhaust flap 10, the control of which makes it possible, depending on the circumstances, to establish the counterpressure necessary for the good recirculation of the exhaust gases towards the intake . Finally, FIG. 1 shows the exhaust gas filtering device proposed by the invention, which comprises a filtering member, such as a self-cleaning grill 11 whose operation is coupled to that of the EGR valve 8. In accordance with the diagram , the filtering member may be constituted by a pivoting gate placed at the inlet of the recirculation pipe 7. The filtering grid 11 and the EGR valve 8, can thus be mechanically coupled by a rod 12, without this provision is mandatory because, in the context of the invention, any type of control link between these two elements can be implemented. FIG. 2, which illustrates a non-limiting embodiment of the invention, includes the flap 8a of the EGR valve, the grille 11, and the rod 12. In this embodiment of the device, the rod 12 is articulated. on two legs 13, 15, rigidly fixed to the annular support 11a of the gate 11, and the pivoting flap 8a of the EGR valve 8, for example at their respective pivot axes.

En se reportant aux figures 3 et 4, on voit que la grille 11 peut pivoter entre une première position de filtrage (figure 3), où elle s'étend au travers de la conduite de recirculation, et une deuxième position de nettoyage (figure 4), où elle s'étend au travers du conduit d'échappement. Dans la première position, la grille 11 couvre l'ouverture de départ du conduit de recirculation, de manière à retenir les particules solides, contenues dans las gaz d'échappement, notamment celles qui sont dues au vieillissement du filtre à particules, et à éviter qu'elles soient renvoyées à l'admission avec les gaz de recirculation : la grille 11 est en position de filtrage lorsque la vanne EGR 8 est ouverte, c'est-à-dire lorsqu' - 5 - au moins une partie des gaz d'échappement, sont renvoyés vers l'admission. Dans la seconde position, où position de nettoyage de la grille 11, la vanne EGR est fermée 8. La grille s'étend alors au travers du conduit d'échappement 4a. Elle est ainsi balayée par les gaz d'échappement, de sorte que les particules accumulées dans la première position sont détachées de celle-ci, et emportées par le flux. With reference to FIGS. 3 and 4, it can be seen that the grid 11 can pivot between a first filtering position (FIG. 3), where it extends through the recirculation pipe, and a second cleaning position (FIG. 4). ), where it extends through the exhaust duct. In the first position, the grid 11 covers the starting opening of the recirculation duct, so as to retain the solid particles contained in the exhaust gas, in particular those due to the aging of the particulate filter, and to avoid that they are returned to the inlet with the recirculation gases: the gate 11 is in the filtering position when the EGR valve 8 is open, that is to say when at least part of the gas exhaust, are returned to the admission. In the second position, where cleaning position of the gate 11, the EGR valve is closed 8. The gate then extends through the exhaust pipe 4a. It is thus swept by the exhaust gases, so that the particles accumulated in the first position are detached therefrom and carried away by the flow.

Dans le mode de réalisation non limitatif illustré par ces figures, la grille 11 est couplée par une biellette à la vanne EGR, et est transversale à la direction principale d'écoulement des gaz (axe de la conduite d'échappement), en position de nettoyage. In the nonlimiting embodiment illustrated by these figures, the gate 11 is coupled by a link to the EGR valve, and is transverse to the main direction of gas flow (axis of the exhaust pipe), in the position of cleaning.

Toutefois, sans sortir du cadre de l'invention, on peut mettre en oeuvre d'autres dispositions, par exemple d'autres modes de couplage, mécaniques ou non, entre le volet et la grille, ou encore incliner la grille au-delà d'une position la transversale, par rapport à la direction d'écoulement des gaz dans le conduit d'échappement, de manière à faciliter son balayage, et l'évacuation des particules. En conclusion, la principale qualité de la grille de filtrage est d'être autonettoyante, grâce au dispositif proposé. En effet, elle arrête ainsi les débris du filtre au départ de la boucle EGR, et est nettoyée automatiquement par balayage, entre les phases de recirculation. However, without departing from the scope of the invention, it is possible to implement other arrangements, for example other modes of coupling, mechanical or otherwise, between the shutter and the grid, or to incline the grid beyond a transversal position, with respect to the flow direction of the gases in the exhaust duct, so as to facilitate its sweeping, and the evacuation of the particles. In conclusion, the main quality of the filtering grid is to be self-cleaning, thanks to the proposed device. Indeed, it stops the debris of the filter at the start of the EGR loop, and is cleaned automatically by scanning, between the recirculation phases.

Claims (10)

REVENDICATIONS 1. Dispositif de filtrage de gaz d'échappement prélevés sur le conduit d'échappement (4a) d'un moteur thermique en aval d'un organe de dépollution (6) sous le contrôle d'une vanne EGR (8), pour être envoyés dans une conduite de recirculation (7) vers l'admission du moteur, caractérisé en ce qu'il comporte un organe de filtrage autonettoyant (11) des gaz envoyés en recirculation, dont le fonctionnement est lié à celui de la vanne EGR (8). An exhaust gas filtering device taken from the exhaust pipe (4a) of a heat engine downstream of a pollution control device (6) under the control of an EGR valve (8), to be sent in a recirculation line (7) to the inlet of the engine, characterized in that it comprises a self-cleaning filter member (11) of the gases sent in recirculation, whose operation is linked to that of the EGR valve (8 ). 2. Dispositif de filtrage selon la revendication 1, caractérisé en ce que l'organe de filtrage (11) est couplé mécaniquement à la vanne EGR (8). 2. Filtering device according to claim 1, characterized in that the filtering member (11) is mechanically coupled to the EGR valve (8). 3. Dispositif de filtrage selon la revendication 1 ou 2, caractérisé en ce que l'organe de filtrage (11) est une grille pivotante placée au départ de la conduite de recirculation (7). 3. Filtering device according to claim 1 or 2, characterized in that the filter member (11) is a pivoting gate placed at the start of the recirculation pipe (7). 4. Dispositif de filtrage selon la revendication 3, caractérisé en ce que la grille (11) pivote entre une première position de filtrage, où elle occupe l'entrée de la conduite de recirculation (7), et une deuxième position de nettoyage, où elle s'étend au travers du conduit d'échappement (4a). 4. Filter device according to claim 3, characterized in that the grid (11) pivots between a first filter position, where it occupies the inlet of the recirculation pipe (7), and a second cleaning position, where it extends through the exhaust duct (4a). 5. Dispositif de filtrage selon la revendication 3 ou 4, caractérisé en ce que la grille (11) est en position de filtrage lorsque la vanne EGR (8) est ouverte, et en position de nettoyage lorsque celle- ci est fermée- 7 - 5. Filtering device according to claim 3 or 4, characterized in that the gate (11) is in the filtering position when the EGR valve (8) is open, and in the cleaning position when the latter is closed. 6. Dispositif de filtrage selon l'une des revendications 3, 4 ou 5, caractérisé en ce que la vanne EGR (8) et la grille de filtrage (11) sont couplés mécaniquement par une biellette (12). 6. Filtering device according to one of claims 3, 4 or 5, characterized in that the EGR valve (8) and the filtering grid (11) are mechanically coupled by a rod (12). 7. Dispositif de filtrage selon la revendication 6, caractérisé en ce que la biellette (12) est articulée sur deux pattes {13, 15) solidaires de la vanne EGR (8) et de la grille (11) 7. Filtering device according to claim 6, characterized in that the link (12) is articulated on two tabs (13, 15) integral with the EGR valve (8) and the gate (11). 8. Dispositif de filtrage selon la revendication 7, caractérisé en ce que les biellettes sont fixées respectivement sur un support annulaire (lla) de la grille il, et sur le volet pivotant (8a) de la vanne EGR (8). 8. Filtering device according to claim 7, characterized in that the rods are respectively fixed on an annular support (11a) of the grid 11, and on the pivoting flap (8a) of the EGR valve (8). 9. Dispositif de filtrage selon l'une des 15 revendications 4 à 8, caractérisé en ce que la grille (11) en position de nettoyage s'étend transversalement à l'axe du conduit d'échappement (4a). 9. Filtering device according to one of claims 4 to 8, characterized in that the gate (11) in the cleaning position extends transversely to the axis of the exhaust duct (4a). 10. Dispositif de filtrage selon l'une des revendications 4 à 8, caractérisé en ce que la grille 20 (11) en position de nettoyage est inclinée au-delà de la transversale à l'axe du conduit (4a), dans le sens d'écoulement des gaz. 10. Filtering device according to one of claims 4 to 8, characterized in that the gate 20 (11) in the cleaning position is inclined beyond the transverse to the axis of the duct (4a), in the direction flow of gases.
FR0757876A 2007-09-26 2007-09-26 DEVICE FOR FILTERING THE RECIRCULATION GASES OF A COMBUSTION ENGINE Withdrawn FR2921434A1 (en)

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Application Number Priority Date Filing Date Title
FR0757876A FR2921434A1 (en) 2007-09-26 2007-09-26 DEVICE FOR FILTERING THE RECIRCULATION GASES OF A COMBUSTION ENGINE
EP08300261A EP2042723A1 (en) 2007-09-26 2008-08-26 Device for filtering the recirculation gases of a combustion engine

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FR0757876A FR2921434A1 (en) 2007-09-26 2007-09-26 DEVICE FOR FILTERING THE RECIRCULATION GASES OF A COMBUSTION ENGINE

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DE102012221621A1 (en) 2012-11-27 2014-06-12 Continental Automotive Gmbh Valve
DE102012224232A1 (en) * 2012-12-21 2014-06-26 Continental Automotive Gmbh Valve

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Publication number Priority date Publication date Assignee Title
EP0349729A1 (en) * 1988-07-07 1990-01-10 Pierburg Gmbh Exhaust gas recirculation device
DE3833957A1 (en) * 1988-10-06 1990-04-12 Daimler Benz Ag DEVICE FOR EXHAUST GAS RECIRCULATION IN DIESEL ENGINES
US5027781A (en) * 1990-03-28 1991-07-02 Lewis Calvin C EGR valve carbon control screen and gasket
FR2799503A1 (en) * 1999-10-12 2001-04-13 Renault Engine unit for turbocharged motor vehicle with an exhaust catalyzer, uses recirculation of exhaust gas into the combustion chambers to remove oxides of nitrogen, extracts exhaust before it reaches the turbocharger
US20020078935A1 (en) * 2000-12-21 2002-06-27 Opris Cornelius N. Energy recuperating gas filtering EGR particulate tray for EGR systems
EP1340904A1 (en) * 2002-03-01 2003-09-03 Renault s.a.s. Low pressure exhaust gas recirculation system
US20050109017A1 (en) * 2003-11-26 2005-05-26 Gsi Engine Management Group Exhaust gas recirculation afterburner
DE102005056955A1 (en) * 2005-11-30 2007-05-31 Volkswagen Ag Internal combustion engine, e.g. diesel engine with low pressure exhaust gas recycling, has exhaust gas recycle valve and exhaust gas flap that are arranged either integrated in particle filter or combined behind particle filter
FR2895015A1 (en) * 2005-12-15 2007-06-22 Renault Sas Exhaust gas treatment device for internal combustion engine, has path with catalytic treatment units respectively arranged in upstream and downstream of valve, where one unit is loaded lesser than catalytic treatment unit of another path
FR2898639A3 (en) * 2006-03-16 2007-09-21 Renault Sas Exhaust gas recirculation for e.g. diesel engine, involves sampling heat engine's e.g. diesel engine, exhaust gas between catalyzer and particle filter or between two particle filters

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