EP1270918B1 - Appareil pour recirculation de gaz d'échappement dans un courant d'air d'admission - Google Patents

Appareil pour recirculation de gaz d'échappement dans un courant d'air d'admission Download PDF

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Publication number
EP1270918B1
EP1270918B1 EP01115521A EP01115521A EP1270918B1 EP 1270918 B1 EP1270918 B1 EP 1270918B1 EP 01115521 A EP01115521 A EP 01115521A EP 01115521 A EP01115521 A EP 01115521A EP 1270918 B1 EP1270918 B1 EP 1270918B1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
inlet
throttle
elbow section
intake passage
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
EP01115521A
Other languages
German (de)
English (en)
Other versions
EP1270918A1 (fr
Inventor
Paul Wiliam Guthrie
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to EP01115521A priority Critical patent/EP1270918B1/fr
Priority to DE60103047T priority patent/DE60103047T2/de
Publication of EP1270918A1 publication Critical patent/EP1270918A1/fr
Application granted granted Critical
Publication of EP1270918B1 publication Critical patent/EP1270918B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10026—Plenum chambers
    • F02M35/10032—Plenum chambers specially shaped or arranged connecting duct between carburettor or air inlet duct and the plenum chamber; specially positioned carburettors or throttle bodies with respect to the plenum chamber
    • 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
    • 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
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10255—Arrangements of valves; Multi-way valves
    • 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
    • F02M35/10314—Materials for intake systems
    • F02M35/10327—Metals; Alloys
    • 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
    • F02M35/1034—Manufacturing and assembling intake systems
    • F02M35/10347—Moulding, casting or the like
    • 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
    • F02M26/18—Thermal insulation or heat protection
    • 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
    • F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/08—Thermoplastics

Definitions

  • This invention relates to an apparatus for recirculating exhaust gas into an inlet air stream in an internal combustion engine.
  • a conventional air intake and exhaust gas recirculation assembly comprises a housing including an intake passage for inlet air, a throttle valve including a throttle blade arranged in the intake passage so as to be rotatable about a pivot axis between opening and closing positions, and an exhaust gas recirculation conduit communicating with said intake passage downstream of the throttle valve so as to introduce exhaust gas into the inlet air flowing through the intake passage.
  • the exhaust gas should be introduced into the inlet air stream so as to be evenly distributed to every engine cylinder.
  • the exhaust gas is very important to provide good mixing of the exhaust gas with the inlet air.
  • the exhaust gas contains many products of the combustion process and residual substances carried away from the combustion chamber during the exhaust process.
  • Such components of the exhaust gas are known to cause deposit build-up on the throttle body surfaces with which they come in contact. Deposits on the throttle body represent a serious concern in that they may cause the throttle blade to stick.
  • deposits on the throttle body represent a serious concern in that they may cause the throttle blade to stick.
  • deposits cause a serious problem also in that they may block the airflow past the throttle blade in the limp home mode. For engine safety concepts this is a serious problem.
  • ice can form on the throttle body. Ice forms where there is sufficient moisture in the inlet air to condensate on cold surfaces and then to change to ice. Ice formation influences the airflow through the intake passage in a similar way to deposits and therefore affects the operation of the engine severely. Icing of the throttle body occurs when the throttle body surfaces are cold and sufficient moisture is present in the inlet air. Inside the inlet manifold moisture comes from both the exhaust gas and blow-by gas from the crank case.
  • EP 0 881 378 A3 describes a method of introducing exhaust gas in such a way that it is drawn into the inlet manifold downstream of the throttle body through tangential openings.
  • the tangential introduction results in a spiral motion of the entering gas which is said to facilitate good mixing with the inlet air.
  • US-A-4 697 569 describes a method of introducing exhaust gas at the throttle body through semi-circular annular openings to facilitate good mixing with the inlet air.
  • US-A-4 461 150 describes a method of introducing exhaust gas into the inlet manifold downstream of the throttle body through a number of symmetrically arranged angled inlets so as to produce a spiral gas flow into the inlet manifold. Similar as in the above mentioned EP 0 881 378 such spiral gas flow is said to provide for good mixing of the inlet air and the exhaust gas. Furthermore, such spiral gas flow is intended to prevent the exhaust gas from contacting the throttle body. To this end the exhaust gas is fed into a region downstream of the throttle blade so as not to get entrained into the backflow air region formed in the wake of the throttle blade.
  • DE 4 420 247 A1 describes a method of introducing exhaust gas into the inlet manifold downstream of the throttle body through a plurality of openings arranged in a circular symmetrical pattern about the axis of the intake passage.
  • This patent discloses also another embodiment wherein the plurality of openings is replaced by a single annular opening.
  • the intake passage includes a venturi section at the area into which the exhaust gas is introduced by the openings. Such a venturi section will create higher inlet air velocity which may improve the mixing of inlet air and recirculated exhaust gas.
  • this patent talks about a thermal insulation between the throttle body and the plastic inlet manifold to prevent damage to the plastic manifold.
  • a further object is to provide for good mixing of inlet air and recirculated exhaust gas.
  • a further object is to optimise heating of the throttle body of the throttle valve.
  • the intake passage comprises an elbow section between the throttle member of the throttle valve and an exhaust gas inlet for preventing entry of exhaust gas into the backflow region downstream of the throttle member.
  • the elbow section of the present invention allows for the introduction of exhaust gas into a region where there is no recirculating or backflowing air. Rather the exhaust gas is introduced into a region of the air stream that is free flowing directly into the inlet manifold.
  • exhaust has from contacting the interior surfaces of the throttle valve housing (throttle body) and the throttle member (throttle blade) it is possible to prevent deposit from forming in those area.
  • exhaust gas carries with it large quantities of moisture which when in contact with cold surfaces forms ice.
  • By preventing the exhaust gas from contacting the throttle valve surfaces it is also possible to significantly reduce the possibility of icing.
  • the throttle member is disposed closely adjacent to an upstream end of the elbow section so that the backflow region extends into the elbow section.
  • the exhaust gas inlet is disposed closely adjacent to a downstream end of the elbow section. This allows to mix the entering hot exhaust gas with cooler inlet air as soon as possible downstream of the throttle valve so that the mixing time is maximized and therefore the heat of the exhaust gas is diluted well before it reaches the interior surfaces of the inlet manifold. It has been calculated that for a 350°C exhaust gas (highest temperature expected) entering a 40°C inlet air stream (highest ambient temperature expected) at a proportion of 30 % by mass exhaust gas (highest exhaust gas expected) the final bulk gas temperature would be around 170°C assuming perfect mixing.
  • 170°C is the maximum temperature that a typical plastic manifold can withstand. Placing the elbow section as close to the throttle valve as possible and introducing the gas in such a way as to maximize the mixing will ensure that the exhaust gas cannot damage an inlet manifold made from plastic.
  • a further modification of the invention provides that the elbow section is comprised of a separate housing member fitted between the throttle body and the inlet manifold.
  • the elbow housing member and the throttle body are connected to each other so as to provide for optimal heat transfer therebetween.
  • heat from the exhaust gas is used to warm the elbow housing member which transfers heat to the throttle body so as to raise the temperature thereof.
  • the moisture present in the exhaust gas is the major cause for icing on the throttle valve surfaces. It is therefore intended to provide heat to the throttle body only when it is required.
  • the thermal inertia of the elbow section and throttle body should be minimized so that they can be heated rapidly as required to prevent ice formation.
  • the level to which the temperature of the throttle body is raised must be carefully checked to ensure that is it not too high. This could be done using appropriate CFD-analysis.
  • the optimal heat transfer connection of the elbow section housing member to the throttle body is there to optimise the heating of the throttle body not so much to reduce the temperature of the elbow section housing member.
  • a further result of such optimal heat transfer and minimal thermal inertia is that during a hot soak condition the throttle body can cool at the fastest possible rate dependent on the ambient temperature surrounding it.
  • the elbow section between the throttle member and the inlet manifold is used to introduce the exhaust gas so as to avoid the air backflow region downstream of the throttle member thereby preventing deposit and ice formation.
  • the elbow housing member is connected to the throttle body so as to transfer heat from the exhaust gas to the throttle body to avoid ice formation.
  • the elbow housing member and the throttle body are provided with the lowest possible thermal inertia to reduce the hot soak temperature and the time to effect heating of the throttle body.
  • the exhaust gas is introduced into the inlet air stream in such a way that the temperature of the exhaust gas is reduced sufficiently during mixture with fresh inlet air so it cannot damage an inlet manifold made from plastic.
  • an air intake passage 2 is provided to feed inlet air to a pluralities of cylinders of an internal combustion engine (not shown).
  • Inlet passage 2 comprises a throttle body 4 and an elbow section 6 which is connected to an inlet manifold 8.
  • Throttle body 4 contains a throttle member 10.
  • throttle member 10 is a conventional throttle blade rotatable about an axis 11 between opening and closing positions to control the flow rate of the inlet air stream.
  • An exhaust gas recirculating conduit 12 which receives exhaust gas from an exhaust gas system (not shown) of the internal combustion engine terminates in an exhaust gas inlet 14 introducing exhaust gas into the intake passage 2 for mixing with the inlet air stream.
  • elbow section 6 which is of 90° design is used to prevent exhaust gas introduced into the inlet air stream from reaching the backflow region 16. Nevertheless exhaust gas is introduced into the inlet air stream at a location as close as possible to the throttle member 10 and backflow region 16 in order to provide for good mixing of inlet air and exhaust gas.
  • throttle member 10 is disposed closely adjacent to the upstream end of elbow section 6 so that backflow region 16 extends into the interior of elbow section 6. Furthermore, exhaust gas inlet 14 is disposed closely adjacent to the downstream end 24 (indicated by dashed lines) of elbow section 6.
  • the exhaust gas inlet 14 comprises a single orifice arranged to introduce the exhaust gas into the intake passage tangentially with respect to the circumferential wall 20 of the intake passage so as to provide for a spiral exhaust gas flow pattern 22.
  • the tangential entry of the exhaust gas helps to ensure that the exhaust gas does not travel back up the neck of the elbow section into the backflow region 16.
  • the exhaust gas inlet 14 introduces the exhaust gas at a location where the inlet air stream is free flowing as indicated by arrows 18.
  • throttle body 4 and inlet section 6 could be made as an integral part, they are preferably made of separate housing members.
  • the elbow section 6 housing member is provided with the exhaust gas inlet 14 so that exhaust gas is used to heat elbow section 6.
  • Elbow section 6 is connected to throttle body 4 through flange means 26 so as to provide for good heat transfer therebetween.
  • Throttle body 4 and elbow section 6 are made of metal of low thermal inertia, preferably of die cast aluminium.
  • a thermally conducting sealing means (not shown) could be provided within flange means 26.
  • elbow section 6 is connected to inlet manifold 8 by flange means 28.
  • inlet manifold 8 is made of plastic material.
  • Flange means 28 could be designed so as to provide for thermal isolation between inlet manifold 8 and the housing member of elbow section 6.
  • elbow section 6 and exhaust gas inlet 14 provide for good mixing of fresh inlet air and exhaust gas to prevent damage of the inlet manifold 8.

Claims (10)

  1. Dispositif permettant de recycler des gaz d'échappement dans un courant d'air d'admission dans un moteur à combustion interne, comprenant
       un passage d'admission (2), permettant de faire communiquer de l'air d'admission avec un collecteur d'admission (8),
       une vanne à papillon, contenant un élément d'étranglement (10) qui se trouve dans ledit passage d'admission (2), de façon à être mobile entre des positions d'ouverture et de fermeture, de telle sorte qu'une zone de reflux (16) existe en aval dudit élément d'étranglement (10) pendant le fonctionnement, et
       un conduit (12) de recyclage de gaz d'échappement, agencé pour introduire des gaz d'échappement dans ledit passage d'admission (2) à travers une entrée (14) pour gaz d'échappement, en aval dudit élément d'étranglement (10),
       caractérisé en ce que
       ledit passage d'admission (2) comprend une section coudée (6) entre ledit élément d'étranglement (10) et ladite entrée (14) pour gaz d'échappement, afin d'empêcher l'entrée de gaz d'échappement dans ladite zone de reflux (16).
  2. Dispositif selon la revendication 1, dans lequel ladite section coudée (6) comprend un coude à 90°.
  3. Dispositif selon la revendication 1 ou selon la revendication 2, dans lequel ledit élément d'étranglement (10) se trouve tout près d'une extrémité amont de ladite section coudée (6), de sorte que ladite zone de reflux (16) s'étend dans ladite section coudée (6).
  4. Dispositif selon l'une quelconque des revendications 1 à 3, dans lequel ladite entrée (14) pour gaz d'échappement se trouve tout près d'une extrémité aval de ladite section coudée (6).
  5. Dispositif selon l'une quelconque des revendications précédentes, dans lequel ladite entrée (14) pour gaz d'échappement est une entrée à orifice unique.
  6. Dispositif selon la revendication 5, dans lequel ladite entrée (14) pour gaz d'échappement est agencée pour introduire les gaz d'échappement dans ledit passage d'admission (2) tangentiellement par rapport à une paroi circonférentielle (20) dudit passage d'admission (2), afin de procurer une allure hélicoïdale à l'écoulement de gaz d'échappement (22).
  7. Dispositif selon l'une quelconque des revendications précédentes, dans lequel ladite section coudée (6) est constituée d'un élément indépendant de carter, fixé entre un corps d'étrangleur (4) et un collecteur d'admission (8).
  8. Dispositif selon la revendication 7, dans lequel ladite entrée (14) pour gaz d'échappement se trouve dans ledit élément de carter à section coudée (6).
  9. Dispositif selon la revendication 8, dans lequel ledit élément de carter à section coudée (6) et ledit corps d'étrangleur (4) sont raccordés l'un à l'autre afin de procurer un transfert de chaleur optimal entre eux.
  10. Dispositif selon la revendication 8 ou selon la revendication 9, dans lequel ledit élément de carter à section coudée (6) et ledit corps d'étrangleur (4) ont une inertie thermique minimale.
EP01115521A 2001-06-27 2001-06-27 Appareil pour recirculation de gaz d'échappement dans un courant d'air d'admission Expired - Lifetime EP1270918B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP01115521A EP1270918B1 (fr) 2001-06-27 2001-06-27 Appareil pour recirculation de gaz d'échappement dans un courant d'air d'admission
DE60103047T DE60103047T2 (de) 2001-06-27 2001-06-27 Apparat für Abgasrückführung in einer Ansaugluftströmung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01115521A EP1270918B1 (fr) 2001-06-27 2001-06-27 Appareil pour recirculation de gaz d'échappement dans un courant d'air d'admission

Publications (2)

Publication Number Publication Date
EP1270918A1 EP1270918A1 (fr) 2003-01-02
EP1270918B1 true EP1270918B1 (fr) 2004-04-28

Family

ID=8177845

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01115521A Expired - Lifetime EP1270918B1 (fr) 2001-06-27 2001-06-27 Appareil pour recirculation de gaz d'échappement dans un courant d'air d'admission

Country Status (2)

Country Link
EP (1) EP1270918B1 (fr)
DE (1) DE60103047T2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005042314A1 (de) * 2005-09-06 2007-03-08 Behr Gmbh & Co. Kg Wärmetauscher
FR2907513B1 (fr) * 2006-10-19 2008-12-12 Coutier Moulage Gen Ind Dispositif de recirculation des gaz d'echappement d'un moteur a combustion interne
DE102008046594A1 (de) * 2008-07-18 2010-01-21 Mahle International Gmbh Ventileinrichtung
DE112019000058T5 (de) 2019-08-07 2020-02-27 Komatsu Ltd. Mischanschluss und motor
CN113550843B (zh) * 2020-10-30 2023-02-03 长城汽车股份有限公司 接口管、发动机组件及车辆

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4420247B4 (de) * 1994-06-10 2004-03-04 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Abgasrückführungseinrichtung für Verbrennungsmotoren, insbesondere mit Plastesaugrohren
US5572979A (en) * 1995-07-05 1996-11-12 Ford Motor Company Engine air induction system
JP3528517B2 (ja) * 1997-05-30 2004-05-17 日産自動車株式会社 エンジンの排気ガス還流装置
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

Also Published As

Publication number Publication date
EP1270918A1 (fr) 2003-01-02
DE60103047T2 (de) 2004-08-26
DE60103047D1 (de) 2004-06-03

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