WO2014107126A1 - Agencement de recirculation de gaz d'échappement au niveau d'un moteur à combustion interne - Google Patents

Agencement de recirculation de gaz d'échappement au niveau d'un moteur à combustion interne Download PDF

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Publication number
WO2014107126A1
WO2014107126A1 PCT/SE2013/051513 SE2013051513W WO2014107126A1 WO 2014107126 A1 WO2014107126 A1 WO 2014107126A1 SE 2013051513 W SE2013051513 W SE 2013051513W WO 2014107126 A1 WO2014107126 A1 WO 2014107126A1
Authority
WO
WIPO (PCT)
Prior art keywords
inlet pipe
outlets
egr
injector
inlet
Prior art date
Application number
PCT/SE2013/051513
Other languages
English (en)
Inventor
Fredrik Modahl
Henrik HÅKANSSON HOLST
Original Assignee
Scania Cv Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Scania Cv Ab filed Critical Scania Cv Ab
Priority to BR112015015193A priority Critical patent/BR112015015193B8/pt
Priority to EP13870300.4A priority patent/EP2941558B1/fr
Priority to KR1020157020009A priority patent/KR101795699B1/ko
Publication of WO2014107126A1 publication Critical patent/WO2014107126A1/fr

Links

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
    • F02M35/10209—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
    • 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

Definitions

  • the present invention relates to an arrangement and a method according to the preambles to the independent claims.
  • the invention relates to an arrangement and a method for the supply of exhaust gases to the inlet air in a combustion engine.
  • the fraction of exhaust gases in the air/exhaust gas mixture that is supplied to the cylinders of the engine must be accurately controlled since too small a fraction of exhaust gases normally gives an increased production of NQ X , and too large a fraction of exhaust gases may give a severely increased formation of soot.
  • the fraction of exhaust gases is equal in ail cylinders.
  • it is important that the recirculated flow of exhaust gases is mixed into the incoming air in a suitable manner.
  • EGR flow will be used to denote the recirculated partial flow of the total exhaust gas flow of the engine.
  • the EGR flow is normally recirculated to the inlet air through an EGR line, normally designed as a small EGR pipe, which is connected to the exhaust gas side of the engine being connected to a part of a line that leads inlet air to the cylinders.
  • EGR line normally designed as a small EGR pipe
  • Such a line for the inlet air is terminated with an inlet pipe (an inlet branch pipe) attached at the engine and that comprises connection ducts to the various cylinders of the combustion engine, which connection channels are arranged along one side of the inlet pipe.
  • Inlet valves are arranged at the cylinders, and are opened in order to supply the relevant cylinder with inlet air.
  • EP-2133548 concerns a gas mixing system in association with an EGR system. The purpose is to improve the mixing of the recirculated exhaust gases in the air flow. This is achieved by, among other measures, providing the mixing pipe with a number of openings through which the exhaust gases can pass.
  • US-59571 16 concerns an EGR pipe adapted to be arranged in the air intake and to comprise a number of holes through which the recirculated exhaust gases are passed to the flow of air.
  • DE ⁇ 10303569 describes an EGR system in which the exhaust gases are recirculated into the inlet pipe via a mixing pipe that takes the flow of exhaust gases in a direction opposite to the flow in the inlet pipe before the exhaust gases are introduced into the inlet pipe via openings not only in the longitudinal wall of the mixing pipe but also in its end.
  • FR-2908471 concerns an EGR system in which the exhaust gases are
  • the pipe is turned in one variant such that the exhaust gases are supplied to the inlet pipe in a direction that is opposite to the flow there.
  • US-7389770 concerns an arrangement and a method for the supply of
  • the arrangement includes an outlet section with a number of outlets for the supply of exhaust gases and where the outlet section demonstrates an outlet path in the duct for incoming air.
  • One purpose with this prior art arrangement is to improve the distribution of the recirculating exhaust gases which is achieved through, among other properties, the outlets being spread along the longitudinal direction of the duct and distributed around a circumference of the outlet section. It is mentioned also that the outlet section may be located externally to the duct for incoming air.
  • a further desire for an EGR system is that it should be possible to connect the inlet pipe in a simple manner to different types of connection line for the supply of air to the inlet pipe, which influences the design of the EGR injector.
  • the connection lines often have different orientations in different applications and there is, therefore, a desire that the EGR injector be arranged at the inlet line in order to avoid the necessity to adapt the connection lines such that the EGR injector can be arranged there.
  • the purpose of the present invention is to achieve an EGR system that contributes to a more even distribution of the EGR gases in the flow of air in the inlet line.
  • a further purpose is to design the EGR system such that different types of connection line can be connected to the inlet pipe in a simple manner.
  • the recirculating exhaust gases (the EGR gases) are introduced according to the invention into the flow of inlet air through an EGR injector.
  • the outlet part of the EGR injector is arranged upstream in the flow of iniet air relative to the connection point at the iniet pipe, and is located outside of the iniet pipe. In this way, a mixing path of a length that is as large as possible is achieved without requiring any specific changes of the connection lines depending on different applications.
  • the outlets for the emission of EGR gases in the inlet line are located
  • the outlet part extends a predetermined distance outside of the opening of the inlet pipe, which distance is of the order of magnitude of 50 mm, this distance being determined essentially by the design of the parts that are to be connected to the opening of the iniet line.
  • the length of the protruding part of the EGR injector must, therefore, not be too long for it to be possible to connect different types of connecting part. This is, consequently, a desire that conflicts with that of achieving as thorough a mixing of the exhaust air as possible, since this is achieved by allowing the EGR injector to emit the exhaust gases distant from the first inlet suction valve.
  • Figures 1 a and 1 b show a schematic cross-section along the longitudinal axis of the inlet pipe according to two embodiments of connections lines for the inlet air.
  • FIG. 2 is a flow diagram that illustrates the method according to the present invention.
  • Figure 3 is a perspective view that illustrates an inlet pipe with an EGR system according to the present invention.
  • Figure 4 is a perspective view that illustrates an inlet pipe with an EGR system according to the present invention where the connection line has been removed.
  • Figure 5 is a perspective view seen from the inlet end of an inlet pipe with an EGR system according to the present invention where the connection line has been removed.
  • Figure 6 is a view from the side of a part of the inlet duct with an EGR system
  • connection line has been removed.
  • Figure 7 is a perspective view seen obliquely from above of a part of the inlet duct that shows the EGR system according to one embodiment of the present invention.
  • FIGS 8 and 9 are schematic views from above that show two embodiments of the EGR system according to the present invention.
  • FIGs 1 a and 1 b show schematically an arrangement for the recirculation of exhaust gases in a muiticylinder combustion engine, otherwise known as an "exhaust gas recirculation" system, or “EGR system” 2.
  • the combustion engine may be a muiticylinder Otto engine or a diesel engine.
  • the arrangement comprises an inlet pipe (an inlet branch line) 4 for inlet air 6 intended to be supplied to the cylinders of the combustion engine.
  • the inlet line has an essentially rectangular cross-section such that plane surfaces are available at its external surfaces, but it may have another cross-sectional form in alternative embodiments, such as a circular or square form.
  • the inlet pipe 4 demonstrates an inlet end 8.
  • connection line 9a, 9b The inlet end is adapted to be connected to a connection line 9a, 9b through which air is supplied to the inlet pipe 4.
  • the connection line may have many different designs, depending on the type of engine. An embodiment is shown in Figure 1 a in which the connection line 9a extends downwards in the drawing, while Figure 1 b shows an embodiment in which the connection line 9b extends upwards in the drawing. The two embodiments are otherwise the same. Both of these embodiments are shown in Figure 3 in the same drawing, but the intention is that only one of the alternative embodiments is to be present in one and the same embodiment.
  • the connection line 9a, 9b may in other applications have other directions and it may be, for example, arranged to be parallel to and concentric with the inlet line 4, or to be placed at a greater or lesser angle.
  • the EGR system 2 comprises further an EGR injector 10 for the supply of recirculating exhaust gases 12 to the inlet air 6, and adapted to be arranged in the inlet line 4 in association with the inlet end 8.
  • the EGR injector 10 comprises an outlet part 14 comprising at least one outlet 16 for the distributed supply of exhaust gases 12, and an end part 18.
  • An EGR line 22, also sometimes known as an "EGR pipe” is adapted to introduce the recirculating exhaust gases 12 to the EGR injector.
  • the EGR line 22 has an inlet connected to the exhaust gas side of the engine, through which a partial flow of exhaust gases is diverted from its principal flow.
  • the term "outlet” 16 is here used to denote holes through a wall of the outlet part 14 through which outlets, or outlet holes, exhaust gases can pass and be mixed with the inlet air 6.
  • the outlet part 14 is adapted to take recirculating exhaust gases 12 in a direction essentially opposite to the direction of the inlet air 8 in the inlet pipe 4 before the recirculating exhaust gases leave the outlet part through the outlets 18 and are mixed with the inlet air 6.
  • the outlet part 14 is located essentially outside of the inlet pipe 4.
  • the outlet part 14 comprises several outlets 16 distributed along the longitudinal direction of the inlet pipe.
  • the term "outside of is here used to denote that it extends essentially outside of the inlet line 4 while remaining inside of the connecting line 9a, 9b. This does not exclude that a small part of the same or its outlets may be located inside of the inlet pipe.
  • the outlet part 14 When viewed along the direction of flow of the inlet air, the outlet part 14 is located essentially upstream of the inlet pipe 4.
  • connection lines 9a, 9b comprise upstream of what is shown in the drawings air intakes, air filters, etc., that are, in themselves, known and not shown in the drawings, according to what is normally present in combustion engines. These comprise in certain engines turbocharging units and intercooiers. In such cases, that part of the connection line 9a, 9b that connects to the inlet pipe 4 is often known as the "charge air pipe" since the air inside it has passed both a
  • turbocharger unit and an intercooler.
  • the outlets 16 are asymmetrically distributed around a circumference that is transverse to the direction of motion of the incoming air. The purpose of distributing the outlets in the longitudinal direction and distributing them
  • the outlets 16 are asymmetrically distributed around the circumference through most of the outlets being located around half of the circumference.
  • the asymmetrical distribution can be seen clearly in Figure 7 where the outlets can be seen arranged on the right side of the outlet part 14.
  • the fact that most of the outlets are arranged around half of the circumference means preferably that more than 75% of the outlets are arranged there.
  • the outlets are designed as round holes of the same size, and this in a corresponding manner results in also the total area of the outlets being greater on one side of the outlet part.
  • the outlets 16 are asymmetrically distributed in such a manner that most of the outlets (the greatest total area of the outlets) are facing away from that side of the inlet pipe 4 at which the connection ducts to the cylinders of the combustion engine are located.
  • the cylinders of the engine are located at the left or most distant side of the inlet pipe 4 in Figures 3-7.
  • the end part 18 is located at the outlet part 14, i.e. the outermost end of the outlet part, a predetermined distance L outside of the inlet end 8 of the inlet pipe 4.
  • the end part should not protrude too far outside of the inlet end since it then may influence the possibility of mounting the connection lines 9a, 9b.
  • the predetermined distance preferably lies in the interval 40-60 mm, for example approximately 50 mm.
  • the said outlet part 14 may be an
  • outlets 16 are essentially circularly symmetrical pipe, and that the outlets 16 are arranged in the wall of the pipe.
  • Other cross-sectional forms are, of course, possible within the scope of the innovative concept of the invention, such as, for example, an elliptical cross-section, a square or a rectangular cross-section.
  • the end part 18 of the outlet part 14 is preferably closed, i.e. there are no outlets there.
  • the number of outlets is a maximum of approximately 50 and the total area of the outlets 16 essentially agrees with the cross-sectional area of the injector inlet end 20 of the EGR injector 10 (see Figure 1 ).
  • the outlets 16 are essentially circular, but other forms, such as extended outlets, are also possible.
  • the EGR injector 10 is a separate unit provided with an attachment collar 21 , see, for example, Figures 6 and 7, at the injector inlet end 20.
  • the attachment collar 21 is preferably attached at the outer surface of the inlet pipe 4 and is further connected to the EGR line 22 that takes the recirculating exhaust gases 12 to the inlet pipe 4.
  • the EGR injector constitutes an integral part of the said EGR line 22.
  • the EGR injector be manufactured from stainless steel.
  • the inlet pipe 4 must be provided with an opening 23 (see, for example, Figures 1 , 8 and 9) in one wail where the EGR injector is mounted, through which opening the EGR injector introduces the recirculating exhaust gases 12 into the inlet pipe 4.
  • the opening 23 may be Iocated along a longitudinal central axis A1 (see Figures 8 and 9) of the inlet pipe 4. It may, on the other hand, sometimes be a design advantage to allow the opening 23 to lie displaced from the central axis A1.
  • the outlet part 14 be Iocated as close to the centre of the inlet pipe 4 as possible. Two examples of how this can be achieved are given in the embodiments that are shown schematically in Figures 8 and 9, where the opening 23 is displaced relative to A1 .
  • FIG 8 An embodiment is shown in Figure 8 in which the longitudinal central axis A2 of the outlet part 14 demonstrates an angle relative to the axis A1.
  • the angle between A1 and A2 is preferably less than 20°.
  • the outlets will in this way be optimally Iocated to achieve an effective distribution of the recirculated exhaust gases. It is seen clearly also in Figure 7 thai the outlet part 14 is set at an angle relative to the longitudinal axis A1 of the inlet pipe 4,
  • FIG. 9 An embodiment is shown in Figure 9 in which the EGR injector has, instead, been set at an angle, such that the longitudinal axis of the outlet part 14 essentially coincides with A1 .
  • FIG 3 is a perspective view that illustrates an inlet pipe 4 in an EGR system 2 according to the present invention.
  • the drawing shows two alternative connection lines 9a, 9b connected to the inlet pipe 4, corresponding to what is shown in Figures 1 a and 1 b.
  • Figure 4 is a perspective view that illustrates an inlet pipe 4 in an EGR system 2 according to the present invention.
  • the connection piece has here been removed in order to iliusfrate how the EGR injector and its outlet part 14 are arranged and oriented relative to the inlet pipe 4.
  • Figure 5 is a perspective view seen from the inlet end of an inlet pipe 4 with an EGR system according to the present invention where the connection line has been removed.
  • a variant of the outlet part, among other things, is here shown in which the outlet end 18 is closed.
  • Figure 6 is a view from the side of a part of the inlet pipe with an EGR system according to the present invention where the connection line has been removed.
  • the attachment collar 21 is shown in this drawing, which attachment collar is used to attach the EGR injector 21 at the inlet pipe 4 according to one embodiment.
  • FIG 7 is a perspective view seen obliquely from above of a part of the inlet pipe that shows the EGR system according to one embodiment of the present invention, which embodiment has been discussed also in association with Figure 8.
  • EGR system exhaust gas recirculation system
  • the EGR system 2 comprises further an EGR injector 10 for the supply of recirculating exhaust gases 12 to the incoming air 8 and adapted to be arranged in the said inlet pipe 4 in association with the said inlet end 8, and the EGR injector comprises an outlet part 14 comprising at least one outlet 16 for the distributed supply of exhaust gases 12 and an end part 18, and tthe outlet part 14 is adapted to take the recirculating exhaust gases 12 in a direction essentially opposite to the direction of incoming air 6 in the inlet pipe 4.
  • the method according to the invention comprises:
  • the said several outlets are asymmetrically distributed around the circumference through most of the outlets being located around one half of the circumference. It is preferable that most of the outlets means that more than 75% of the outlets are located around one half of the circumference.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

La présente invention concerne un agencement de recirculation des gaz d'échappement dans un moteur à combustion. Un tuyau d'admission (4) est agencé pour l'air entrant (6) amené aux cylindres du moteur, ledit tuyau d'admission (4) possédant une extrémité d'admission (8) et un injecteur EGR (10) pour amener les gaz d'échappement en recirculation (12) dans l'air entrant (6). L'injecteur EGR est agencé dans le tuyau d'admission (4) de telle sorte que la partie de sortie (14) de l'injecteur EGR est positionnée pour l'essentiel à l'extérieur de la conduite d'admission (4). La partie de sortie (14) comprend plusieurs sorties (16) réparties dans la direction longitudinale de la partie de sortie et lesdites multiples sorties (16) sont réparties de façon asymétrique autour de la circonférence de la partie de sortie.
PCT/SE2013/051513 2013-01-04 2013-12-16 Agencement de recirculation de gaz d'échappement au niveau d'un moteur à combustion interne WO2014107126A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BR112015015193A BR112015015193B8 (pt) 2013-01-04 2013-12-16 Arranjo para recirculação de escapamentos em um motor de combustão interna
EP13870300.4A EP2941558B1 (fr) 2013-01-04 2013-12-16 Agencement de recirculation de gaz d'échappement au niveau d'un moteur à combustion interne
KR1020157020009A KR101795699B1 (ko) 2013-01-04 2013-12-16 내연기관에서 배기가스를 재순환하는 장치

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1350004A SE536919C2 (sv) 2013-01-04 2013-01-04 Anordning för återcirkulering av avgaser vid en förbränningsmotor
SE1350004-6 2013-01-04

Publications (1)

Publication Number Publication Date
WO2014107126A1 true WO2014107126A1 (fr) 2014-07-10

Family

ID=51062373

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PCT/SE2013/051513 WO2014107126A1 (fr) 2013-01-04 2013-12-16 Agencement de recirculation de gaz d'échappement au niveau d'un moteur à combustion interne

Country Status (5)

Country Link
EP (1) EP2941558B1 (fr)
KR (1) KR101795699B1 (fr)
BR (1) BR112015015193B8 (fr)
SE (1) SE536919C2 (fr)
WO (1) WO2014107126A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2560743A (en) * 2017-03-23 2018-09-26 Jaguar Land Rover Ltd Intake manifold

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102658308B1 (ko) 2016-12-26 2024-04-18 엘에스엠트론 주식회사 배기가스 재순환 시스템
KR102581357B1 (ko) 2018-08-06 2023-09-22 엘에스엠트론 주식회사 농작업차량용 엔진

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2622509A1 (de) * 1976-05-20 1977-12-01 Ford Werke Ag Vorrichtung zur zufuhr von zusatzluft bzw. abgas in das ansaugrohr von ueber vergaser gespeiste brennkraftmaschinen
JP2000054915A (ja) * 1998-08-10 2000-02-22 Isuzu Motors Ltd Ｅｇｒ装置
US20020112708A1 (en) * 1999-07-15 2002-08-22 Jochem Fischer Fluid feed duct for a hot fluid in a hollow structure
GB2386158A (en) * 2002-03-07 2003-09-10 Denso Corp Intake system for internal combustion engine
US7389770B2 (en) * 2001-03-02 2008-06-24 Volvo Lastvagnar Ab Apparatus for supply of recirculated exhaust gas
DE102007035556A1 (de) * 2007-07-28 2009-01-29 Daimler Ag Mischvorrichtung zum Zumischen eines Abgasrückführstroms in einen Ladeluftstrom einer Brennkraftmaschine
EP2133548A1 (fr) * 2008-06-12 2009-12-16 Perkins Engines Company Limited Système de mélange de gaz

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2879262B1 (fr) * 2004-12-13 2007-04-06 Renault Sas Repartiteur d'air en matiere plastique pour moteur a combustion interne a recirculation de gaz d'echappement.
US9080536B2 (en) * 2011-02-24 2015-07-14 General Electric Company Systems and methods for exhaust gas recirculation

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2622509A1 (de) * 1976-05-20 1977-12-01 Ford Werke Ag Vorrichtung zur zufuhr von zusatzluft bzw. abgas in das ansaugrohr von ueber vergaser gespeiste brennkraftmaschinen
JP2000054915A (ja) * 1998-08-10 2000-02-22 Isuzu Motors Ltd Ｅｇｒ装置
US20020112708A1 (en) * 1999-07-15 2002-08-22 Jochem Fischer Fluid feed duct for a hot fluid in a hollow structure
US7389770B2 (en) * 2001-03-02 2008-06-24 Volvo Lastvagnar Ab Apparatus for supply of recirculated exhaust gas
GB2386158A (en) * 2002-03-07 2003-09-10 Denso Corp Intake system for internal combustion engine
DE102007035556A1 (de) * 2007-07-28 2009-01-29 Daimler Ag Mischvorrichtung zum Zumischen eines Abgasrückführstroms in einen Ladeluftstrom einer Brennkraftmaschine
EP2133548A1 (fr) * 2008-06-12 2009-12-16 Perkins Engines Company Limited Système de mélange de gaz

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2941558A4 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2560743A (en) * 2017-03-23 2018-09-26 Jaguar Land Rover Ltd Intake manifold
GB2560743B (en) * 2017-03-23 2020-04-15 Jaguar Land Rover Ltd Intake manifold with a secondary gas inlet

Also Published As

Publication number Publication date
BR112015015193B8 (pt) 2022-05-10
BR112015015193B1 (pt) 2022-02-22
EP2941558A4 (fr) 2016-08-10
KR20150097800A (ko) 2015-08-26
KR101795699B1 (ko) 2017-11-08
EP2941558B1 (fr) 2018-02-28
EP2941558A1 (fr) 2015-11-11
BR112015015193A2 (pt) 2017-07-11
SE1350004A1 (sv) 2014-07-05
SE536919C2 (sv) 2014-10-28

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