EP1580421A1 - 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
EP1580421A1
EP1580421A1 EP05102243A EP05102243A EP1580421A1 EP 1580421 A1 EP1580421 A1 EP 1580421A1 EP 05102243 A EP05102243 A EP 05102243A EP 05102243 A EP05102243 A EP 05102243A EP 1580421 A1 EP1580421 A1 EP 1580421A1
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EP
European Patent Office
Prior art keywords
duct
channels
openings
engine
exhaust gases
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Granted
Application number
EP05102243A
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English (en)
French (fr)
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EP1580421B1 (de
EP1580421B2 (de
Inventor
Riccardo Veronese
Paolo Grosso
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Iveco SpA
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Iveco SpA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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.
  • Such channels are to introduce a gas, preferably a gas other than that which constitutes such current of gas, transversely, preferably perpendicularly, in relation to such duct in the section of introduction.
  • the gas is preferably introduced in a direction that is perpendicular to the wall of the duct at the point of introduction.
  • 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, wherein a portion of the exhaust gases coming from the engine are picked up and divided into at least two flows, and such flows are then fed into a current of air that is supplied to such engine. Such flows are introduced transversely, preferably perpendicularly, in relation to the direction of such current of air. Such flows are preferably introduced into such air current upstream of the intake manifold of such engine.
  • 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 transversely, preferably 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 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 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)
  • 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.

Landscapes

  • 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)
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
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
ITMI20040564 2004-03-23

Publications (3)

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

Family

ID=34856929

Family Applications (1)

Application Number Title Priority Date Filing Date
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 (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2090770A1 (de) 2008-02-15 2009-08-19 IVECO S.p.A. Motor mit Abgasrückführung, Rückführungsverfahren und mit einem derartigen Motor ausgerüstetes Fahrzeug
EP3009652A1 (de) * 2014-09-30 2016-04-20 Kubota Corporation Einlasskrümmer für mehrzylindrige brennkraftmaschine
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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4119071A (en) * 1976-09-17 1978-10-10 Toyota Jidosha Kogyo Kabushiki Kaisha Exhaust gas recirculating device in an 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
EP1004767A2 (de) * 1998-11-27 2000-05-31 Nissan Motor Co., Ltd. Abgasrückführungssystem für Brennkraftmaschine
JP2001304050A (ja) * 2000-04-19 2001-10-31 Aisan Ind Co Ltd 吸気通路用ガス導入装置
EP1264981A1 (de) * 2001-06-05 2002-12-11 Holset Engineering Company Limited Mischung mehrerer Fluidströme

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4119071A (en) * 1976-09-17 1978-10-10 Toyota Jidosha Kogyo Kabushiki Kaisha Exhaust gas recirculating device in an 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
EP1004767A2 (de) * 1998-11-27 2000-05-31 Nissan Motor Co., Ltd. Abgasrückführungssystem für Brennkraftmaschine
JP2001304050A (ja) * 2000-04-19 2001-10-31 Aisan Ind Co Ltd 吸気通路用ガス導入装置
EP1264981A1 (de) * 2001-06-05 2002-12-11 Holset Engineering Company Limited Mischung mehrerer Fluidströme

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 120 (M - 685) 14 April 1988 (1988-04-14) *
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 04 30 April 1997 (1997-04-30) *
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 14 31 December 1998 (1998-12-31) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 04 31 August 2000 (2000-08-31) *
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 02 2 April 2002 (2002-04-02) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2090770A1 (de) 2008-02-15 2009-08-19 IVECO S.p.A. Motor mit Abgasrückführung, Rückführungsverfahren und mit einem derartigen Motor ausgerüstetes Fahrzeug
EP3009652A1 (de) * 2014-09-30 2016-04-20 Kubota Corporation Einlasskrümmer für mehrzylindrige brennkraftmaschine
JP2016070187A (ja) * 2014-09-30 2016-05-09 株式会社クボタ 多気筒エンジンの吸気マニホルド
US10612498B2 (en) 2014-09-30 2020-04-07 Kubota Corporation Intake manifold of vertical multicylinder engine
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

Also Published As

Publication number Publication date
DE602005007528D1 (de) 2008-07-31
ITMI20040564A1 (it) 2004-06-23
ES2307109T3 (es) 2008-11-16
ES2307109T5 (es) 2012-12-28
EP1580421B1 (de) 2008-06-18
ATE398728T1 (de) 2008-07-15
EP1580421B2 (de) 2012-07-04

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