EP1703116B1 - Abgasrückführeinheit für Brennkraftmaschinen - Google Patents

Abgasrückführeinheit für Brennkraftmaschinen Download PDF

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Publication number
EP1703116B1
EP1703116B1 EP06005000A EP06005000A EP1703116B1 EP 1703116 B1 EP1703116 B1 EP 1703116B1 EP 06005000 A EP06005000 A EP 06005000A EP 06005000 A EP06005000 A EP 06005000A EP 1703116 B1 EP1703116 B1 EP 1703116B1
Authority
EP
European Patent Office
Prior art keywords
exhaust manifold
exhaust gas
catalyst
exhaust
catalyst portion
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 - Fee Related
Application number
EP06005000A
Other languages
English (en)
French (fr)
Other versions
EP1703116A3 (de
EP1703116A2 (de
Inventor
Tadashi Toda
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.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
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 Toyota Motor Corp filed Critical Toyota Motor Corp
Publication of EP1703116A2 publication Critical patent/EP1703116A2/de
Publication of EP1703116A3 publication Critical patent/EP1703116A3/de
Application granted granted Critical
Publication of EP1703116B1 publication Critical patent/EP1703116B1/de
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust 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
    • 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
    • F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
    • 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
    • F02M26/41—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories characterised by the arrangement of the recirculation passage in relation to the engine, e.g. to cylinder heads, liners, spark plugs or manifolds; characterised by the arrangement of the recirculation passage in relation to specially adapted combustion chambers
    • 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
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics

Definitions

  • the present invention relates to an exhaust gas recirculation unit for an internal combustion engine.
  • An exhaust gas recirculation unit (hereinafter referred to as an EGR unit) is a known unit recirculating exhaust gas emitted from a combustion chamber of an internal combustion engine to an exhaust pipe into an intake pipe to suppress an increase in combustion temperature in order to reduce nitrogen oxides in the exhaust gas formed when the internal combustion engine is in operation.
  • an EGR unit When such an EGR unit is employed, the increase in combustion temperature can be suppressed, and formation of nitrogen oxides can be reduced.
  • the amount of unburned hydrocarbon contained in the exhaust gas is increased, and the hydrocarbon deposits on components of the EGR unit, deteriorating the components. Consequently, an EGR unit provided with a catalyst for removing hydrocarbon by oxidation has been proposed as disclosed for example in Japanese Patent Laying-Open No. 11-125148 .
  • Document EP 1 331 388 A2 further discloses an EGR device for engines, capable of recirculating a SOF-removed EGR gas irrespective of the set condition of a catalyst in an exhaust system and without needing to extend an EGR conduit and to provide a universal joint.
  • the EGR conduit is connected at one end thereof to an exhaust pipe collected portion of an exhaust manifold, and at the other end thereof to an engine-side fixing flange, and a catalyst used exclusively for EGR is provided in the EGR conduit.
  • a part of an exhaust gas flowing in the exhaust manifold is recirculated as an EGR gas into the intake air system for an engine via the EGR conduit, and, during this time, the SOF contained in the EGR gas is removed by the catalyst.
  • the present invention has been made in view of these circumstances, and one object of the present invention is to provide an exhaust gas recirculation unit capable of quickly increasing the temperature of a catalyst with a simple structure.
  • the present invention is an exhaust gas recirculation unit having a catalyst portion removing hydrocarbon by oxidation in an exhaust gas recirculation pipe recirculating exhaust gas from an internal combustion engine into an intake pipe, the catalyst portion being provided in direct contact with an external surface of an exhaust pipe of the internal combustion engine, and being disposed with its longitudinal direction oriented substantially perpendicular to a direction in which branch pipes extend.
  • the catalyst portion removing hydrocarbon by oxidation is in contact with the external surface of the exhaust pipe of the internal combustion engine. Accordingly, the catalyst portion directly receives heat from the external surface of the hot exhaust pipe heated by hot exhaust gas emitted from a combustion chamber. Therefore, the temperature of a catalyst can be increased quickly with a simple structure. Also, with this structure, a larger contact area between the catalyst portion and the exhaust manifold can be obtained, and the entire exhaust gas recirculation unit can be designed compactly.
  • the catalyst portion is provided in contact with an upper portion of the external surface of the exhaust pipe.
  • the catalyst portion is attached to the upper portion of the external surface of the exhaust pipe, that is, the portion releasing the greatest amount of heat in the external surface of the exhaust pipe, the temperature of a catalyst can be increased efficiently.
  • the catalyst portion is provided in contact with an external surface of an exhaust manifold of the internal combustion engine.
  • the catalyst portion is in contact with the external surface of the exhaust manifold located at the uppermost stream of the exhaust pipe of the internal combustion engine.
  • the catalyst portion is in contact with a portion of the exhaust pipe having the greatest temperature. Consequently, the temperature of a catalyst can be increased more quickly.
  • a catalyst portion When a catalyst portion is provided in contact with an external surface of an exhaust manifold of an internal combustion engine, if the catalyst portion is disposed at a position where branch pipes constituting the exhaust manifold are independently provided, some section of the catalyst portion is in contact with the exhaust manifold, and some section of the catalyst portion is not in contact with the exhaust manifold. In this case, the section of the catalyst portion not in contact with the exhaust manifold is hard to heat in comparison with the section in contact with the exhaust manifold, and thus it becomes difficult to heat the entire catalyst portion uniformly.
  • the catalyst portion is provided in contact with an external surface of a connected portion where the branch pipes constituting the exhaust manifold are connected.
  • the catalyst portion is in contact with the exhaust manifold evenly, and thus the entire catalyst portion can be heated uniformly.
  • an exhaust gas recirculation unit (hereinafter referred to as an EGR unit) 10 in accordance with an embodiment of the present invention will be described with reference to Figs. 1 and 2 .
  • an exhaust pipe 20 includes an exhaust manifold 22.
  • Exhaust manifold 22 is a manifold having a branch pipe portion 22a including branch pipes 22a1 to 22a4, and a connected portion 22b where branch pipes 22a1 to 22a4 are connected. Exhaust manifold 22 guides exhaust gas from a combustion chamber of an internal combustion engine not shown to the downstream side of exhaust pipe 20. In the present embodiment, exhaust manifold 22 is made of an iron-based material. A turbo charger now shown is connected to a position downstream of exhaust pipe 22.
  • EGR unit 10 includes an exhaust gas recirculation pipe (hereinafter referred to as an EGR pipe) 12, a catalyst portion 14, an EGR cooler not shown, and the like.
  • EGR pipe exhaust gas recirculation pipe
  • catalyst portion 14 an EGR cooler not shown, and the like.
  • EGR pipe 12 on the upstream side of the exhaust gas is connected to exhaust manifold 22, and the other end of EGR pipe 12 on the downstream side of the exhaust gas is connected to an intake pipe not shown. Consequently, exhaust manifold 22 is connected to the intake pipe.
  • EGR pipe 12 is provided with catalyst portion 14 for removing unburned hydrocarbon emitted from the combustion chamber by oxidation.
  • catalyst portion 14 has a cylindrical shape extending in a direction of an axis of EGR pipe 12 (in a direction indicated by an arrow C), and is provided in contact with an external surface of connected portion 22b of exhaust manifold 22 with its longitudinal direction (the direction indicated by arrow C) oriented perpendicular to a direction in which branch pipes 22a1 to 22a4 of exhaust manifold 22 extend (a direction indicated by an arrow M).
  • Catalyst portion 14 includes a cylindrical cover 14a containing a noble metal catalyst not shown, a bracket 14b for securing cover 14a to exhaust manifold 22, and a bolt 14c for securing bracket 14b to exhaust manifold 22.
  • Cover 14a is secured to exhaust manifold 22 via bracket 14b by fastening bolt 14c into a bolt hole not shown formed in exhaust manifold 22.
  • bracket 14b has a semicircular concave shape to fit with the shape of a lower portion of cylindrical cover 14a.
  • cover 14a of catalyst portion 14 is attached in contact with an upper portion of the external surface of exhaust manifold 22.
  • Cover 14a, bracket 14b, and bolt 14c constituting catalyst portion 14 and EGR pipe 12 are all made of an iron-based material.
  • a noble metal catalyst which is activated at a high temperature and has an improved capability of removing hydrocarbon by oxidation is employed as a catalyst provided within catalyst portion 14.
  • catalyst portion 14 is attached is not limited to the manner illustrated in the above embodiment, specifically, the manner in which cover 14a is secured to exhaust manifold 22 via bracket 14b.
  • Cover 14a may be provided in contact with the external surface of exhaust manifold 22 without a bracket, for example by securing bracket 14b attached to cover 14a to a position other than exhaust manifold 22 such as a cylinder head. In this case, heat transfer from the external surface of exhaust manifold 22 to the catalyst within cover 14a is more directly performed, increasing the temperature of the catalyst more quickly.
  • catalyst portion 14 is attached is not limited to the direction illustrated in the above embodiment, specifically, the direction such that catalyst portion 14 is disposed with its longitudinal direction oriented substantially perpendicular to the direction in which branch pipes 22a1 to 22a4 extend.
  • catalyst portion 14 may be disposed with its longitudinal direction oriented along the direction in which branch pipes 22a1 to 22a4 extend.
  • catalyst portion 14 is not limited to the position illustrated in the above embodiment, specifically, connected portion 22b where branch pipes 22a1 to 22a4 constituting exhaust manifold 22 are connected.
  • catalyst portion 14 may be attached to a position closer to the upstream side of the exhaust gas than connected portion 22b and having independently provided branch pipes 22a1 to 22a4 constituting an exhaust manifold 22A.
  • catalyst portion 14 may partially be deviated from an upper portion of an external surface of an exhaust manifold 22B. The temperature of a catalyst can also be increased in these cases, via a portion in contact with exhaust manifolds 22A and 22B.
  • the position to which catalyst portion 14 is attached is not limited to the position illustrated in the above embodiment, specifically, the upper portion of the external surface of exhaust manifold 22.
  • the position to which catalyst portion 14 is attached may be altered as described below, depending on the layout of an internal combustion engine or the like.
  • catalyst portion 14 may be attached in contact with a lower portion of an external surface of an exhaust manifold 22C.
  • catalyst portion 14 may be attached in contact with a side portion of an external surface of an exhaust manifold 22D. It is desirable to attach catalyst portion 14 to the most appropriate position on an external surface of an exhaust manifold, taking the amount of heat that catalyst portion 14 receives from exhaust manifold 22, a restriction on the layout of an internal combustion engine, and the like into consideration.
  • catalyst portion 14 is not limited to the position illustrated in the above embodiment, specifically, the external surface of exhaust manifold 22.
  • it may be attached to a position in exhaust pipe 20 other than exhaust manifold 22.
  • catalyst portion 14 can be any portion as long as it is provided in contact with the external surface of exhaust pipe 20 of the internal combustion engine.

Landscapes

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

Claims (4)

  1. Abgasrückführungseinheit (10) mit einem Katalysatorbereich (14), der Kohlenwasserstoff durch Oxidation in einer Abgasrückfühmngsleitung (12), die ein Abgas von einem Verbrennungsmotor in eine Einlassleitung rückführt, beseitigt, dadurch gekennzeichnet, dass
    der Katalysatorbereich (14) in einem direkten Kontakt mit einer äußeren Oberfläche der Abgasleitung (20) des Verbrennungsmotor angeordnet ist, wobei der Katalysatorbereich (14) so angeordnet ist, dass seine Längsrichtung im Wesentlichen senkrecht zu einer Richtung ausgerichtet ist, in der sich Abzweigleitungen (22a1 - 22a4) erstrecken, die einen Auspuffkrümmer (22) ausbilden.
  2. Abgasrückführungseinheit (10) nach Anspruch 1, wobei der Katalysatorbereich (14) in direktem Kontakt mit einem oberen Bereich der äußeren Oberfläche der Abgasleitung (20) angeordnet ist.
  3. Abgasrückführungseinheit (10) nach Anspruch 1, wobei der Katalysatorbereich (14) in direktem Kontakt mit einer äußeren Oberfläche des Auspuffkrümmer (22) des Verbrennungsmotors angeordnet ist.
  4. Abgasrückführungseinheit (10) nach Anspruch 3, wobei der Katalysatorbereich (14) in direktem Kontakt mit einer äußeren Oberfläche eines verbundenen Bereichs (22b) angeordnet ist, wo die Abzweigleitungen (22a1-22a4), die den Auspuffkrümmer (22) bilden, verbunden sind.
EP06005000A 2005-03-15 2006-03-10 Abgasrückführeinheit für Brennkraftmaschinen Expired - Fee Related EP1703116B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005073080A JP4297067B2 (ja) 2005-03-15 2005-03-15 排気還流装置

Publications (3)

Publication Number Publication Date
EP1703116A2 EP1703116A2 (de) 2006-09-20
EP1703116A3 EP1703116A3 (de) 2007-06-27
EP1703116B1 true EP1703116B1 (de) 2012-02-15

Family

ID=36202488

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06005000A Expired - Fee Related EP1703116B1 (de) 2005-03-15 2006-03-10 Abgasrückführeinheit für Brennkraftmaschinen

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EP (1) EP1703116B1 (de)
JP (1) JP4297067B2 (de)
CN (1) CN100570148C (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5550813B2 (ja) * 2008-01-10 2014-07-16 ダイハツ工業株式会社 内燃機関における排気ガス還流装置
FR2935435B1 (fr) * 2008-08-29 2012-10-05 Peugeot Citroen Automobiles Sa Boucle de recirculation de gaz d'echappement.
US8196568B2 (en) 2009-06-16 2012-06-12 Ford Global Technologies, Llc Cold start gas component retention system in EGR circuit with recirculated gas control
JP5278458B2 (ja) * 2011-01-31 2013-09-04 三菱自動車工業株式会社 排気還流装置
JP5494510B2 (ja) * 2011-01-31 2014-05-14 三菱自動車工業株式会社 排気還流装置
FR3005997B1 (fr) * 2013-05-22 2015-06-19 Peugeot Citroen Automobiles Sa Moteur de vehicule automobile a recirculation de gaz d'echappement a refroidissement ameliore
CN111170273B (zh) * 2020-03-03 2023-08-15 大连海事大学 一种基于氨能源船舶的冷热电三联供复合系统及供电方法
JP7400693B2 (ja) 2020-10-28 2023-12-19 マツダ株式会社 エンジンの排気循環装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06100158B2 (ja) * 1987-01-30 1994-12-12 三菱自動車工業株式会社 過給機付き内燃機関用フイルタ付き排気再循環装置
JP3307502B2 (ja) * 1993-07-06 2002-07-24 株式会社日本自動車部品総合研究所 排気ガス浄化装置
US5701736A (en) * 1994-12-19 1997-12-30 Nippon Soken, Inc. Apparatus for purifying exhaust gas
JPH11125148A (ja) * 1997-10-23 1999-05-11 Mitsubishi Motors Corp 排気ガス還流装置
SE519922C2 (sv) * 1998-12-07 2003-04-29 Stt Emtec Ab Anordning och förfarande för avgasrening samt användning av anordningen
JP3988028B2 (ja) * 2002-01-28 2007-10-10 三菱自動車工業株式会社 エンジンのｅｇｒ装置
JP2005073080A (ja) 2003-08-26 2005-03-17 Nec Access Technica Ltd 折り畳み型携帯電話

Also Published As

Publication number Publication date
JP4297067B2 (ja) 2009-07-15
JP2006257905A (ja) 2006-09-28
EP1703116A3 (de) 2007-06-27
EP1703116A2 (de) 2006-09-20
CN1834440A (zh) 2006-09-20
CN100570148C (zh) 2009-12-16

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