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EP1580421B1 - Dispositif pour mélanger les gas d'échappement recyclés à l'air d'admission d'un moteur et procédé pour recycler les gaz d'échappement - Google Patents

Dispositif pour mélanger les gas d'échappement recyclés à l'air d'admission d'un moteur et procédé pour recycler les gaz d'échappement Download PDF

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Publication number
EP1580421B1
EP1580421B1 EP05102243A EP05102243A EP1580421B1 EP 1580421 B1 EP1580421 B1 EP 1580421B1 EP 05102243 A EP05102243 A EP 05102243A EP 05102243 A EP05102243 A EP 05102243A EP 1580421 B1 EP1580421 B1 EP 1580421B1
Authority
EP
European Patent Office
Prior art keywords
duct
channels
openings
engine
exhaust gases
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP05102243A
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German (de)
English (en)
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EP1580421B2 (fr
EP1580421A1 (fr
Inventor
Riccardo Veronese
Paolo Grosso
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Iveco SpA
Original Assignee
Iveco SpA
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Filing date
Publication date
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Publication of EP1580421B1 publication Critical patent/EP1580421B1/fr
Publication of EP1580421B2 publication Critical patent/EP1580421B2/fr
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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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
    • F02M35/10144—Connections of intake ducts to each other or to another device
    • 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
    • F02M26/12—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems characterised by means for attaching parts of an EGR system to each other or to engine parts
    • 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
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/19—Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10222—Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission

Definitions

  • This invention relates to a device for mixing exhaust gases that are to be recirculated in an internal combustion engine, more specifically in a compression ignition engine, for example a diesel engine of an industrial vehicle.
  • Exhaust gas recirculation is common practice in the field of internal combustion engines. In this system a portion of the exhaust gases from the engine are recirculated upstream of such engine into the air intake system and reintroduced into the combustion chambers with the intake air. This results in a lower combustion temperature, which leads to a reduced formation of nitrogen oxides, one of the main pollutants in internal combustion engine emissions.
  • the exhaust gases are usually recirculated by means of a specific line that picks up the exhaust gases downstream of the engine, for example from the exhaust gas manifold, and then reintroduces the gases into the intake manifold;
  • the line may incorporate a number of devices, such as a recirculation compressor, to overcome any differences between the intake and exhaust pressures, a control valve, a cooling system, to reduce the temperature of the recirculating gases.
  • DE 35 11 094 discloses a device for introducing a gas into the intake channel of an Otto engine.
  • the gas is introduced tangentially into the stream of intake air and the device is suited to be applied to the carburettor of said engine and its construction is rather complex.
  • JP 08 319901 discloses an exhaust recirculation device.
  • the intake passage in correspondence of the introduction point of the exhaust gas, features an enlargement, wherein a element is movable in order to enlarge or restrict the passage, in order to vary the Venturi effect.
  • the device is very bulky and has a complex structure.
  • JP 2001 304 050 discloses another device for mixing recirculated exhaust gases to the intake air of an internal combustion engine.
  • the openings of the channels in the wall of the duct are arranged on a plane that is perpendicular to a longitudinal axis of the duct.
  • Such openings are preferably arranged uniformly along the perimeter of the section on such plane; if there are two channels, they may be arranged with the relative openings the maximum distance apart along such perimeter.
  • the gases are preferably introduced in the opposite directions.
  • Such duct preferably incorporates an elbow upstream of the openings of the channels.
  • the device may also incorporate an appropriate seat to house a control valve, for example a butterfly valve, upstream of such openings and, if present, of such elbow.
  • This invention also relates to a method for recirculating exhaust gases in an engine, by means of the above mentioned device.
  • a duct 1 through which the intake air can flow to an internal combustion engine in the direction indicated by the arrow A.
  • a cross-section 2 of the duct preferably at one end, there are a plurality of channels 3 and 3', for example two, that terminate in the duct 1 through the openings 4 and 4' in the wall of the duct.
  • the ducts are suitable for introducing a gaseous flow perpendicularly, in relation to the current of gas flowing through the duct.
  • the respective openings are preferably arranged uniformly along the perimeter of a cross-section of the duct; in the case shown in the drawing, in which there are two openings, these may be arranged opposite one another in relation to the cross-section of the duct.
  • the direction of introduction is substantially perpendicular to the wall of the duct, and may be incident with a longitudinal axis of symmetry of the duct, if the latter has one.
  • the channels and the inlet may be made integral with the device; they may be delimited by walls that are integral with the device, or be partly delimited by other structures, to which the device must be secured.
  • the device illustrated in the drawings is to be attached directly to the intake manifold of an engine, in correspondence with a suitable opening on the manifold, and have a shape corresponding to the section of the duct 1 at the end 2, for example by means of suitable fastening devices, for example, screws placed through the holes 6.
  • the structure 7 acts as a flange for securing the device to the manifold and also houses the channels 3, 3' and the inlet 5.
  • This and other construction solutions may be carried out according to specific requirements.
  • the device is secured by means of a gasket that is placed between the structure 7 and the intake manifold, in order to ensure tightness while at the same time closing the side of the channels 3 and 3' facing towards the end 2, and thus towards the intake manifold once the device and manifold have been assembled.
  • Other suitable means may be used instead of a gasket, for example, adhesive paste.
  • the inlet 5 must be appropriately connected to a gas recirculation line, that picks up the exhaust gases, for example from the engine exhaust manifold.
  • the openings may be of any suitable shape, for example they may be round, rectangular, rectangular with all or some corners rounded ...
  • an elbow in the air supply line immediately upstream of the intake manifold (for example between the outlet from an intake air cooling unit, located after an intake air compression stage, and the intake manifold).
  • Such elbow may be an integral part of the device according to this invention, upstream of the section containing the openings of the channels.
  • the angle ⁇ between such axes preferably ranges from between 0 and 90° (where 0 is the condition in which the two axes are aligned and the pipe is straight).
  • the area of the perpendicular cross-section of the duct may be variable or constant and is preferably substantially constant for the entire length of the device.
  • the shape, which may advantageously be round or almost round, may also be of another appropriate type.
  • the inside of the elbow must preferably have a certain radius of curvature and must not form a sharp corner; this has been found to ensure good mixing even in the presence of such elbow.
  • D is the average equivalent inside diameter of the duct
  • R is the minimum inside radius of curvature of the duct
  • that in figure 3 is the minimum radius of curvature of the dotted line 11, (which represents the longitudinal section of the inside wall of the duct in the inside part of the elbow)
  • n is the number of such openings, preferably 1 mm ⁇ a/nD ⁇ 10 mm, and more preferably 3 mm ⁇ a/nD ⁇ 6 mm.
  • the device may incorporate a seat for a control valve, preferably a butterfly valve.
  • a seat for a control valve preferably a butterfly valve.
  • Such seat is preferably located upstream of the openings through which the recirculated exhaust gases are introduced, more preferably upstream of the elbow if present.
  • the integration of the valve seat in the device according to this invention may be advantageous, both in order to reduce the size and complexity of the system, thus facilitating assembly, and also to ensure the correct location of the control valve in relation to the other parts that make up the device and compliance with project specifications, in order to enhance mixing.
  • FIG. 1 illustrates a device with such seat 12 made integral with the device; they also illustrate an opening 13 for a valve of an appropriate shape and type, and the means 14 for securing such valve.
  • Such seat is preferably located on a straight section of the duct, upstream of the elbow 8. It is, of course, possible to provide a device that does not incorporate such seat, if the valve is already incorporated in the air supply line upstream of the actual device.
  • a valve body preferably of the butterfly type, may be connected to the device, for example by means of an appropriate flange at the end at which the inlet 15 of the duct 1 is located, or in any other way that is known.
  • the centers of gravity of the areas of the openings of the ducts are preferably on the same plane perpendicular to the axis of the duct 1, and arranged uniformly along the perimeter of the duct.
  • the elbow is present, there is also preferably a straight duct portion between the end of such elbow and the openings of the ducts.
  • L is the length of a straight duct portion extending from the end section of such elbow to a transverse plane on which the centers of gravity of the areas of such openings lie (which defines a perpendicular section of the duct that is also called the mixing section)
  • nLDR/ ⁇ > 500 mm 3 /°.
  • the elbow is not present, there is preferably a straight duct portion between the valve seat, if present, and the mixing section.
  • the straight duct portion may, of cause, be omitted if the device, with no elbow or valve seat, is to be connected to conduits, upstream of the duct 1, with a straight duct portion whereby the same results can be achieved.
  • the length L is calculated from the perpendicular plane containing the center of gravity furthest upstream.
  • the device according to this invention can be installed in all internal combustion engines with compression ignition or controlled ignition, for example, diesel engines, but is also suitable for use in petrol engines or other types of engines, in which a portion of the exhaust gases are recirculated.
  • the device may advantageously be installed on the intake line of the engine. In case of a supercharged engine, it may be installed between the compressor and the intake manifold, preferably downstream of the intake air cooling system, if present.
  • the recirculation system connected via the exhaust gas inlet to the device may be fitted with valves to regulate the flow of the recirculating gases, flow compressors and/or cooling systems, according to the specific requirements.

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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)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Claims (18)

  1. Dispositif mélangeur comprenant :
    un conduit (1) à travers lequel peut s'écouler un flux gazeux;
    au moins deux voies latérales (3, 3') qui débouchent dans une paroi dudit conduit à travers des ouvertures respectives (4, 4') ;
    dans lequel lesdites voies sont adaptées pour permettre d'introduire un flux gazeux, perpendiculairement audit conduit, dans la région d'introduction (2), et de manière sensiblement perpendiculaire à la paroi du conduit au point d'introduction ;
    caractérisé en ce que 1 mm < a/nD < 10 mm, où D est le diamètre intérieur équivalent moyen du conduit, où a est la somme des surfaces et n est le nombre desdites ouvertures.
  2. Dispositif selon la revendication précédente, caractérisé en ce que les ouvertures des voies dans la paroi du conduit sont agencées suivant un plan (2) qui est perpendiculaire à un axe longitudinal (9) du conduit.
  3. Dispositif selon la revendication 2, caractérisé en ce que lesdites ouvertures (4, 4') sont ménagées uniformément le long du périmètre du plan de coupe sur ledit plan (2).
  4. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que le nombre desdites voies (3, 3') est compris entre deux et six.
  5. Dispositif selon les revendication 3 et 4, caractérisé en ce qu'il existe deux voies (3, 3'), disposées de telle manière que leurs s ouvertures respectives (4, 4') soient le plus éloignées possible les unes des autres sur ledit périmètre.
  6. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit conduit présente un coude (8) situé en amont des ouvertures des voies.
  7. Dispositif selon la revendication 6, caractérisé en ce que l'angle (α) défini entre un axe longitudinal (9) du conduit (1) immédiatement en aval dudit coude dans ledit conduit et un axe longitudinal (10) du conduit (1) immédiatement en amont dudit coude, est compris entre 0 et 90 °.
  8. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend un siège (12) adéquat pour y loger une soupape de commande en amont desdites ouvertures.
  9. Dispositif selon la revendication 6 ou 7, caractérisé en ce que DR/α > 15 mm2/°, où D est le diamètre intérieur équivalent moyen du conduit (1) et R est le rayon de courbure intérieur minimum du conduit en correspondance avec ledit coude (8).
  10. Dispositif selon la revendication 7, caractérisé en ce qu'il comprend une partie rectiligne dudit conduit (1) immédiatement en aval d'un plan (2) qui est perpendiculaire à l'axe (9) du conduit sur lequel se trouvent les centres de gravité des ouverture (4, 4'), et en ce que LD/α > 5 mm2/°, où L est la longueur de ladite partie rectiligne.
  11. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que 3 mm < a /nD < 6 mm, où a est la surface de chaque ouverture (4, 4') des voies (3, 3'), et n est le nombre desdites ouvertures.
  12. Dispositif selon la revendication 7, caractérisé en ce qu'il comprend une partie rectiligne dudit conduit immédiatement en amont d'un plan qui est perpendiculaire à l'axe du conduit sur lequel se trouvent les centres de gravité des ouvertures et en ce que nLDR/α > 500 mm3/°, où L est la longueur de ladite partie rectiligne.
  13. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il peut être installé sur le tubulure d'admission d'un moteur à combustion interne.
  14. Dispositif selon la revendication 13, caractérisé en ce qu'il peut être monté sur le collecteur d'admission d'un moteur à combustion interne
  15. Dispositif selon l'une quelconque des revendications précédentes, dans lequel ledit conduit présente un axe de symétrie et les voies sont prévues pour permettre d'introduire un flux gazeux suivant une direction qui est en intersection avec ledit axe.
  16. Dispositif selon la revendication 14, caractérisé en ce qu'il est adéquat pour être monté sur ledit collecteur à l'aide de moyens d'étanchéité qui délimitent également une face desdites voies.
  17. Dispositif selon la revendication 13 ou 14, adéquat pour permettre d'introduire une partie des gaz d'échappement présents dans un flux d'air d'admission dudit moteur.
  18. Procédé pour recycler les gaz d'échappement dans un moteur, dans lequel une partie des gaz d'échappement provenant dudit moteur sont prélevés, caractérisé en ce que ladite partie est subdivisée en au moins deux flux, et par l'introduction desdits flux dans un flux d'air qui est fourni audit moteur, de manière transversale par rapport à la direction dudit flux d'air, en amont du collecteur d'admission dudit moteur, et caractérisé en ce qu'il est mis en oeuvre au moyen d'un dispositif selon l'une quelconque des revendications 1 à 17 et en ce que lesdits flux sont introduits à travers lesdites voies (3, 3') dans ledit flux d'air qui s'écoule à travers ledit conduit (1).
EP05102243A 2004-03-23 2005-03-21 Dispositif pour mélanger les gas d'échappement recyclés à l'air d'admission d'un moteur et procédé pour recycler les gaz d'échappement Expired - Lifetime EP1580421B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20040564 2004-03-23
IT000564A ITMI20040564A1 (it) 2004-03-23 2004-03-23 Dispositivo per la miscelazione di gas di scarico ricircolati ad un motore con l'aria di alimentazione e metodo di ricircolo dei gas di scarico

Publications (3)

Publication Number Publication Date
EP1580421A1 EP1580421A1 (fr) 2005-09-28
EP1580421B1 true EP1580421B1 (fr) 2008-06-18
EP1580421B2 EP1580421B2 (fr) 2012-07-04

Family

ID=34856929

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05102243A Expired - Lifetime EP1580421B2 (fr) 2004-03-23 2005-03-21 Dispositif pour mélanger les gas d'échappement recyclés à l'air d'admission d'un moteur et procédé pour recycler les gaz d'échappement

Country Status (5)

Country Link
EP (1) EP1580421B2 (fr)
AT (1) ATE398728T1 (fr)
DE (1) DE602005007528D1 (fr)
ES (1) ES2307109T5 (fr)
IT (1) ITMI20040564A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010059509A3 (fr) * 2008-11-18 2010-08-05 Cummins Intellectual Properties, Inc. Appareil et procédé pour séparer une borne d'alimentation de compresseur d'air de gaz egr

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2090770B1 (fr) 2008-02-15 2013-08-21 FPT Industrial S.p.A. Moteur à recirculation de gaz d'échappement, procédé pour la recirculation et véhicule doté d'un tel moteur
JP6310377B2 (ja) 2014-09-30 2018-04-11 株式会社クボタ 多気筒エンジンの吸気マニホルド
CN106762243A (zh) * 2016-11-29 2017-05-31 东风朝阳朝柴动力有限公司 柴油发动机进气接管装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5337232A (en) * 1976-09-17 1978-04-06 Toyota Motor Corp Recirculating device of exhaust gas for internal combustion engine
DE3511094A1 (de) * 1985-03-27 1986-10-09 Doduco KG Dr. Eugen Dürrwächter, 7530 Pforzheim Vorrichtung zum zufuehren eines zusatzgasstroms in den ansaugkanal eines ottomotors
JPS62247166A (ja) * 1986-04-18 1987-10-28 Mazda Motor Corp エンジンの排気ガス還流装置
JPH08319901A (ja) * 1995-05-25 1996-12-03 Yamaha Motor Co Ltd 過給機付内燃機関の排気再循環装置
JPH10252576A (ja) * 1997-03-12 1998-09-22 Hino Motors Ltd Ｅｇｒ装置
JP2000008970A (ja) * 1998-06-23 2000-01-11 Nissan Motor Co Ltd 内燃機関の排気ガス還流装置
JP3539246B2 (ja) * 1998-11-27 2004-07-07 日産自動車株式会社 内燃機関の排気還流装置
JP2001304050A (ja) * 2000-04-19 2001-10-31 Aisan Ind Co Ltd 吸気通路用ガス導入装置
GB0113735D0 (en) * 2001-06-05 2001-07-25 Holset Engineering Co Mixing fluid streams

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010059509A3 (fr) * 2008-11-18 2010-08-05 Cummins Intellectual Properties, Inc. Appareil et procédé pour séparer une borne d'alimentation de compresseur d'air de gaz egr
US8096289B2 (en) 2008-11-18 2012-01-17 Cummins Intellectual Properties, Inc. Apparatus and method for separating air compressor supply port from the EGR gas

Also Published As

Publication number Publication date
ITMI20040564A1 (it) 2004-06-23
ATE398728T1 (de) 2008-07-15
EP1580421B2 (fr) 2012-07-04
EP1580421A1 (fr) 2005-09-28
DE602005007528D1 (de) 2008-07-31
ES2307109T3 (es) 2008-11-16
ES2307109T5 (es) 2012-12-28

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