EP1580421B1 - Vorrichtung zum Beimischen von rückgeführtem Abgas zur Ansaugluft eines Motors und Verfahren zur Abgasrückführung - Google Patents

Vorrichtung zum Beimischen von rückgeführtem Abgas zur Ansaugluft eines Motors und Verfahren zur Abgasrückführung 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
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European Patent Office
Prior art keywords
duct
channels
openings
engine
exhaust gases
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EP05102243A
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English (en)
French (fr)
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EP1580421A1 (de
EP1580421B2 (de
Inventor
Riccardo Veronese
Paolo Grosso
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Iveco SpA
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Iveco SpA
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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. Mischvorrichtung, die umfasst:
    ein Rohr (1), durch das ein Gasstrom strömen kann;
    wenigstens zwei Querkanäle (3, 3'), die durch die jeweiligen Öffnungen (4, 4') in eine Wand dieses Rohrs aufgeweitet sind;
    wobei diese Kanäle geeignet sind, eine Gasströmung senkrecht in Bezug auf dieses Rohr in den Einleitungsschnitt (2) und im Wesentlichen senkrecht zu der Wand des Rohrs am Einleitungspunkt einzuleiten,
    dadurch gekennzeichnet, dass 1 mm < a/nD < 10 mm ist, wobei D der mittlere äquivalente Innendurchmesser des Rohrs ist, a die Summe der Flächen ist und n die Anzahl der genannten Öffnungen ist.
  2. Vorrichtung gemäß dem vorherigen Anspruch, dadurch gekennzeichnet, dass die Öffnungen der Kanäle in der Wand des Rohrs in einer Ebene (2) angeordnet sind, die senkrecht zu einer Längsachse (9) des Rohrs ist.
  3. Vorrichtung gemäß Anspruch 2, dadurch gekennzeichnet, dass diese Öffnungen (4, 4') entlang des Umfangs des Schnitts in dieser Ebene (2) gleichmäßig angeordnet sind.
  4. Vorrichtung gemäß einem vorherigen Anspruch, dadurch gekennzeichnet, dass die Anzahl dieser Kanäle (3, 3') zwischen zwei und sechs liegt.
  5. Vorrichtung gemäß Anspruch 3 und 4, dadurch gekennzeichnet, dass es zwei Kanäle (3, 3') gibt, die so platziert sind, dass ihre jeweiligen Öffnungen (4, 4') auf diesem Umfang den maximalen Abstand voneinander haben.
  6. Vorrichtung gemäß einem vorherigen Anspruch, dadurch gekennzeichnet, dass dieses Rohr auf der Einlassseite der Öffnungen der Kanäle einen Krümmer (8) aufweist.
  7. Vorrichtung gemäß Anspruch 6, dadurch gekennzeichnet, dass der Winkel. □) zwischen einer Längsachse (9) des Rohrs (1) direkt auf der Auslassseite dieses Krümmers in diesem Rohr und einer Längsachse (10) des Rohrs (1) direkt auf der Einlassseite dieses Krümmers zwischen 0 und 90° liegt.
  8. Vorrichtung gemäß einem vorherigen Anspruch, dadurch gekennzeichnet, dass sie einen Sitz (12) umfasst, der geeignet ist, ein Steuerventil auf der Einlassseite dieser Öffnungen aufzunehmen.
  9. Vorrichtung gemäß Anspruch 6 oder 7, dadurch gekennzeichnet, dass DR/□ > 15 mm2/° ist, wobei D der mittlere äquivalente Innendurchmesser des Rohrs (1) ist und R der minimale Innenkrümmungsradius des Rohrs in Übereinstimmung mit diesem Krümmer (8) ist.
  10. Vorrichtung gemäß Anspruch 7, dadurch gekennzeichnet, dass sie direkt auf der Einlassseite einer Ebene (2), die senkrecht zu der Achse (9) des Rohrs ist, in der die Schwerpunkte der Öffnungen (4, 4') liegen, einen geraden Abschnitt dieses Rohrs (1) umfasst und dass LD/□ > 5 mm2/° ist, wobei L die Länge dieses geraden Abschnitts ist.
  11. Vorrichtung gemäß einem vorherigen Anspruch, dadurch gekennzeichnet, dass 3 mm < a/nD < 6 mm ist, wobei a die Fläche jeder Öffnung (4, 4') der Kanäle (3, 3') und n die Anzahl dieser Öffnungen ist.
  12. Vorrichtung gemäß Anspruch 7, dadurch gekennzeichnet, dass sie direkt auf der Einlassseite einer Ebene, die senkrecht zu der Achse des Rohrs ist, in der die Schwerpunkte der Öffnungen liegen, einen geraden Abschnitt dieses Rohrs umfasst und dass nLDR/□ > 500 mm3/° ist, wobei L die Länge dieses geraden Abschnitts ist.
  13. Vorrichtung gemäß einem vorherigen Anspruch, dadurch gekennzeichnet, dass sie an der Einlassleitung einer Brennkraftmaschine eingebaut werden kann.
  14. Vorrichtung gemäß Anspruch 13, dadurch gekennzeichnet, dass sie am Saugrohr einer Brennkraftmaschine montiert werden kann
  15. Vorrichtung gemäß einem vorherigen Anspruch, bei der das genannte Rohr eine Symmetrieachse aufweist und die Kanäle geeignet sind, eine Gasströmung mit einer auf die Achse auftreffenden Richtung einzuleiten.
  16. Vorrichtung gemäß Anspruch 14, wobei sie geeignet ist, an dem Krümmer mittels Dichtungsmitteln montiert zu werden, die ebenfalls eine Seite der Kanäle begrenzen.
  17. Vorrichtung gemäß Anspruch 13 oder 14, die geeignet ist, einen Teil der Abgase in einen Ansaugluftstrom des genannten Motors einzuleiten.
  18. Verfahren zum Rückführen von Abgasen in einem Motor, wobei ein Teil der von diesem Motor kommenden Abgase aufgefangen werden, dadurch gekennzeichnet, dass es das Einteilen dieses Teils in wenigstens zwei Strömungen und das Einleiten dieser Strömungen in einen Luftstrom, der diesem Motor zugeführt wird, quer in Bezug auf die Richtung dieses Luftstroms auf der Einlassseite des Saugrohrs dieses Motors umfasst, dadurch gekennzeichnet, dass es mittels einer Vorrichtung gemäß einem der Ansprüche 1 bis 17 ausgeführt wird und dass diese Strömungen durch diese Kanäle (3, 3') in diesen Luftstrom eingeleitet werden, der durch dieses Rohr (1) strömt.
EP05102243A 2004-03-23 2005-03-21 Vorrichtung zum Beimischen von rückgeführtem Abgas zur Ansaugluft eines Motors und Verfahren zur Abgasrückführung Active EP1580421B2 (de)

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 (de) 2005-09-28
EP1580421B1 true EP1580421B1 (de) 2008-06-18
EP1580421B2 EP1580421B2 (de) 2012-07-04

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EP05102243A Active EP1580421B2 (de) 2004-03-23 2005-03-21 Vorrichtung zum Beimischen von rückgeführtem Abgas zur Ansaugluft eines Motors und Verfahren zur Abgasrückführung

Country Status (5)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010059509A2 (en) * 2008-11-18 2010-05-27 Cummins Intellectual Properties, Inc. Apparatus and method for separating air compressor supply port from egr gas

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2090770B1 (de) 2008-02-15 2013-08-21 FPT Industrial S.p.A. Motor mit Abgasrückführung, Rückführungsverfahren und mit einem derartigen Motor ausgerüstetes Fahrzeug
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)

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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 (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010059509A2 (en) * 2008-11-18 2010-05-27 Cummins Intellectual Properties, Inc. Apparatus and method for separating air compressor supply port from egr gas
WO2010059509A3 (en) * 2008-11-18 2010-08-05 Cummins Intellectual Properties, Inc. Apparatus and method for separating air compressor supply port from egr gas
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
ES2307109T3 (es) 2008-11-16
ATE398728T1 (de) 2008-07-15
ITMI20040564A1 (it) 2004-06-23
EP1580421A1 (de) 2005-09-28
EP1580421B2 (de) 2012-07-04
DE602005007528D1 (de) 2008-07-31
ES2307109T5 (es) 2012-12-28

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