EP3085943B1 - Exhaust gas recirculation assembly with exhaust manifold - Google Patents

Exhaust gas recirculation assembly with exhaust manifold Download PDF

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Publication number
EP3085943B1
EP3085943B1 EP16159192.0A EP16159192A EP3085943B1 EP 3085943 B1 EP3085943 B1 EP 3085943B1 EP 16159192 A EP16159192 A EP 16159192A EP 3085943 B1 EP3085943 B1 EP 3085943B1
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EP
European Patent Office
Prior art keywords
exhaust gas
exhaust
gas recirculation
cylinder head
heat exchanger
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EP16159192.0A
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German (de)
French (fr)
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EP3085943A1 (en
Inventor
Peter Foessl
Peter Staub
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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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
    • 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
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • 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
    • F02M26/22—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
    • F02M26/25—Layout, e.g. schematics with coolers having bypasses
    • 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
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine
    • 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
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases

Definitions

  • the invention relates to an exhaust gas recirculation assembly with a cylinder head and an exhaust manifold.
  • exhaust gas is usually removed from the exhaust pipe and mixed with the combustion air. This serves to reduce nitrogen oxides (NOx) and to comply with emission limits in accordance with the applicable regulations.
  • NOx nitrogen oxides
  • the exhaust gas can, for example, be removed directly from the exhaust manifold and reintroduced on the intake side of the internal combustion engine. Depending on the general conditions, the exhaust gas is either cooled before it is supplied to the combustion air or it is supplied uncooled.
  • the exhaust gas recirculation module has an exhaust gas cooler through which the exhaust gas can be guided. If the exhaust gas is to be supplied uncooled, a bypass is opened (for example through a vacuum box that opens or closes a bypass flap valve) so that the exhaust gas flows through a bypass channel and bypasses the heat exchanger.
  • the total amount of exhaust gas that is recirculated is controlled by a control valve that enables the desired volume throughput, for example, map-controlled.
  • the US 2011/315129 A1 as well as the EP 2 077 388 A2 show an exhaust gas recirculation module, in which the recirculated exhaust gas is fed via a separate line to the intake side of the cylinder head.
  • the DE 10 2005 050 234 A1 shows an exhaust gas recirculation section for an exhaust gas recirculation assembly, which has a thermal insulation device.
  • the object of the invention is therefore to provide an exhaust gas recirculation module which is characterized by a small amount of space required.
  • an exhaust gas recirculation module of the type mentioned at the outset that the exhaust manifold is provided with an exhaust gas recirculation branch which is connected directly to an exhaust gas recirculation inlet in the cylinder head, a heat exchanger branch going from the cylinder head, through which exhaust gas can be passed to a heat exchanger , wherein the heat exchanger branch opens on a side surface of the cylinder head, a bypass channel being provided, through which the exhaust gas can be passed bypassing the heat exchanger directly from an exhaust side to an intake side, the exhaust manifold being mounted on the cylinder head and an exhaust manifold gasket being provided by which runs through the connection between the exhaust gas recirculation branch and the exhaust gas recirculation inlet, the bypass channel being integrated in the cylinder head, and the bypass channel being air-gap insulated.
  • the invention is based on the basic concept of not routing the exhaust gas branched off on the exhaust manifold through hoses to be mounted separately on the exhaust manifold, but of introducing it directly into the cylinder head from the exhaust manifold.
  • This creates a highly integrated solution that is characterized by a small installation space.
  • there is less assembly effort because the exhaust gas recirculation branch of the exhaust manifold is automatically connected to the exhaust gas recirculation inlet in the cylinder head when the exhaust manifold is mounted on the cylinder head.
  • no thermal decoupling measures need to be taken, as is necessary in the prior art for thermal length compensation; a bellows, for example, is required there, which leads to additional costs.
  • the heat exchanger branch enables the exhaust gas to be returned to a heat exchanger feed so that it can be cooled in the desired manner.
  • the exhaust gas recirculation duct is sealed by a modified exhaust manifold gasket so that no additional assembly work is required.
  • the bypass enables exhaust gas to be returned uncooled.
  • the heat exchanger is attached to the cylinder head and is connected to the heat exchanger branch. This results in a compact design that does not require any external pipes or hoses.
  • the heat exchanger is preferably provided with an exhaust gas recirculation valve, so that the amount of the exhaust gas to be recycled and flowing through the heat exchanger can be controlled.
  • a bypass valve which is attached to the cylinder head, is preferably assigned to the bypass channel.
  • the bypass valve makes it possible to control the volume flow of the exhaust gas that flows through the bypass channel.
  • the exhaust gas recirculation valve and / or the bypass valve is a control valve.
  • This enables the volume flow of recirculated exhaust gas to be set precisely to the optimum values.
  • a controllable bypass valve offers great advantages. Flow losses are further reduced by completely (at least almost) completely avoiding a volume flow through the exhaust gas recirculation system when both valves are closed.
  • a cylinder head 10 can be seen which, in a manner known per se, serves to supply intake air to a plurality of cylinders of an internal combustion engine and to remove combustion gases from the cylinders.
  • the intake air is provided via an intake system 12, and the combustion gases are discharged via an exhaust manifold 14.
  • part of the exhaust gas can be removed from the exhaust line of the internal combustion engine and returned to the intake side. Two different flow paths are possible for this.
  • a first flow path runs through a heat exchanger 16, in which heat can be extracted from the exhaust gas.
  • a coolant inlet 18 and a coolant outlet 20 are provided for this purpose.
  • an exhaust gas recirculation valve 22 is provided in order to control or regulate the volume flow through the heat exchanger 16.
  • a second flow path runs through a bypass channel 24, through which exhaust gas can be passed directly from the exhaust gas side to the intake side, bypassing the heat exchanger 16.
  • a bypass valve 26 is assigned to the bypass channel 24, with which the volume flow through the bypass channel can be controlled or regulated.
  • the exhaust gas is here removed from the exhaust line by means of an exhaust gas recirculation branch 30, which is provided on the exhaust manifold 14 and is directly connected to an exhaust gas recirculation inlet 32.
  • the exhaust gas recirculation inlet 32 is provided in the cylinder head 10.
  • the exhaust gas recirculation inlet 32 then branches in the cylinder head into a heat exchanger branch 34 and a bypass branch 36.
  • the heat exchanger branch 34 opens out on a side surface of the cylinder head 10 and leads directly to the heat exchanger 16, which is attached to the cylinder head 10.
  • the bypass branch 36 leads to the bypass channel 24, which is integrated here in the cylinder head 10.
  • the bypass duct 24 is here air-gap-insulated with an inner sleeve 38, so that the thermal loads on the cylinder head are reduced and a higher exhaust gas recirculation gas temperature can be achieved.
  • the inner sleeve 38 can be inserted into a bore which is open to the outside of the cylinder head and is then closed with a screw plug 40.
  • the exhaust gas recirculation branch 30 opens directly into the bypass branch 36, namely into the opening made at the end in FIG Figure 3 embodiment shown is closed by the screw plug 40.
  • the exhaust gas recirculation branch 30 extends in the embodiment variant of FIG Figure 3a further to the side than in the embodiment of the Figure 3 the case is.
  • the advantage of returning the exhaust gas directly to the cylinder head is that no external pipes or hoses are required to guide the exhaust gas.
  • the effort of installing such pipes or hoses is avoided since the exhaust gas recirculation branch is connected directly to the exhaust gas recirculation inlet when the exhaust manifold 14 is attached to the cylinder head 10.
  • a slightly modified exhaust manifold gasket can be used for sealing, which seals in the region of the interface between the exhaust gas recirculation branch 30 and the exhaust gas recirculation inlet 32.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Description

Die Erfindung betrifft eine Abgasrückführungsbaugruppe mit einem Zylinderkopf und einem Abgaskrümmer.The invention relates to an exhaust gas recirculation assembly with a cylinder head and an exhaust manifold.

Bei Verbrennungskraftmaschinen wird üblicherweise Abgas aus der Abgasleitung entnommen und der Verbrennungsluft beigemischt. Dies dient der Reduktion von Stickoxiden (NOx) und der Einhaltung von Emissionsgrenzen gemäß den geltenden Vorschriften.In internal combustion engines, exhaust gas is usually removed from the exhaust pipe and mixed with the combustion air. This serves to reduce nitrogen oxides (NOx) and to comply with emission limits in accordance with the applicable regulations.

Das Abgas kann beispielsweise unmittelbar am Abgaskrümmer entnommen werden und auf der Ansaugseite der Verbrennungskraftmaschine wieder eingeleitet werden. In Abhängigkeit von den Rahmenbedingungen wird das Abgas entweder gekühlt, bevor es der Verbrennungsluft zugeführt wird, oder es wird ungekühlt zugeführt.The exhaust gas can, for example, be removed directly from the exhaust manifold and reintroduced on the intake side of the internal combustion engine. Depending on the general conditions, the exhaust gas is either cooled before it is supplied to the combustion air or it is supplied uncooled.

Um das Abgas kühlen zu können, weist die Abgasrückführungsbaugruppe einen Abgaskühler auf, durch den das Abgas geführt werden kann. Wenn das Abgas ungekühlt zugeführt werden soll, wird ein Bypass geöffnet (beispielsweise durch eine Unterdruckdose, die ein Bypass-Klappenventil öffnet oder schließt), sodass das Abgas durch einen Bypasskanal strömt und den Wärmetauscher umgeht. Die Menge des Abgases, das insgesamt rückgeführt wird, wird dabei gesteuert durch ein Regelventil, das beispielsweise kennfeldgesteuert den gewünschten Volumendurchsatz ermöglicht.In order to be able to cool the exhaust gas, the exhaust gas recirculation module has an exhaust gas cooler through which the exhaust gas can be guided. If the exhaust gas is to be supplied uncooled, a bypass is opened (for example through a vacuum box that opens or closes a bypass flap valve) so that the exhaust gas flows through a bypass channel and bypasses the heat exchanger. The total amount of exhaust gas that is recirculated is controlled by a control valve that enables the desired volume throughput, for example, map-controlled.

Im Hinblick auf die zunehmende Komplexität der Verbrennungskraftmaschinen und die verschiedenen Systeme, die zum Erzielen eines niedrigen Kraftstoffverbrauchs und geringer Abgasemissionen eingesetzt werden, ist der Bauraum, der für eine Abgasrückführungsbaugruppe notwendig ist, immer ein wichtiges Thema.With the increasing complexity of internal combustion engines and the various systems used to achieve low fuel consumption and low exhaust emissions, the space required for an exhaust gas recirculation assembly is always an important issue.

Aus der EP 2 077 388 A2 , der JP 2003 074418 A und der EP 1 233 170 A2 sind gattungsgemäße Abgasrückführungsbaugruppen bekannt.From the EP 2 077 388 A2 , the JP 2003 074418 A and the EP 1 233 170 A2 Generic exhaust gas recirculation assemblies are known.

Die US 2011/315129 A1 sowie die EP 2 077 388 A2 zeigen eine Abgasrückführungsbaugruppe, bei der das rückgeführte Abgas über eine separate Leitung der Ansaugseite des Zylinderkopfs zugeführt wird.The US 2011/315129 A1 as well as the EP 2 077 388 A2 show an exhaust gas recirculation module, in which the recirculated exhaust gas is fed via a separate line to the intake side of the cylinder head.

Die DE 10 2005 050 234 A1 zeigt einen Abgasrückleitungsabschnitt für eine Abgasrückführungsbaugruppe, der eine thermische Isolationsvorrichtung aufweist.The DE 10 2005 050 234 A1 shows an exhaust gas recirculation section for an exhaust gas recirculation assembly, which has a thermal insulation device.

Die Aufgabe der Erfindung besteht daher darin, eine Abgasrückführungsbaugruppe zu schaffen, die sich durch einen geringen notwendigen Bauraum auszeichnet.The object of the invention is therefore to provide an exhaust gas recirculation module which is characterized by a small amount of space required.

Zur Lösung dieser Aufgabe ist erfindungsgemäß bei einer Abgasrückführungsbaugruppe der eingangs genannten Art vorgesehen, dass der Abgaskrümmer mit einem Abgasrückführabzweig versehen ist, der unmittelbar mit einem Abgasrückführeinlass im Zylinderkopf verbunden ist, wobei vom Zylinderkopf ein Wärmetauscherabzweig abgeht, durch den Abgas zu einem Wärmetauscher geleitet werden kann, wobei der Wärmetauscherabzweig an einer Seitenfläche des Zylinderkopfes mündet, wobei ein Bypasskanal vorgesehen ist, durch den Abgas unter Umgehung des Wärmetauschers direkt von einer Abgasseite zu einer Ansaugseite geleitet werden kann, wobei der Abgaskrümmer am Zylinderkopf montiert ist und wobei eine Abgaskrümmerdichtung vorgesehen ist, durch die hindurch die Verbindung zwischen Abgasrückführabzweig und Abgasrückführeinlass verläuft, wobei in den Zylinderkopf der Bypasskanal integriert ist, und wobei der Bypasskanal luftspaltisoliert ist. Die Erfindung beruht auf dem Grundkonzept, das am Abgaskrümmer abgezweigte Abgas nicht durch separat am Abgaskrümmer zu montierende Schläuche zu führen, sondern vom Abgaskrümmer direkt in den Zylinderkopf einzuleiten. Hierdurch ist eine hochintegrierte Lösung geschaffen, die sich durch geringen Bauraum auszeichnet. Weiterhin ergibt sich ein geringerer Montageaufwand, da der Abgasrückführabzweig des Abgaskrümmers automatisch mit dem Abgasrückführeinlass im Zylinderkopf verbunden wird, wenn der Abgaskrümmer am Zylinderkopf montiert wird. Weiterhin müssen keine thermischen Entkopplungsmaßnahmen getroffen werden, wie dies im Stand der Technik zum thermischen Längenausgleich notwendig ist; dort ist beispielsweise ein Wellbalg notwendig, der zu zusätzlichen Kosten führt. Zudem ermöglicht der Wärmetauscherabzweig, das rückzuführende Abgas einem Wärmetauscher zuzuführen, sodass es in der gewünschten Weise gekühlt werden kann. Die Abdichtung des Abgasrückführkanals erfolgt durch eine modifizierte Abgaskrümmerdichtung, sodass kein zusätzlicher Montageaufwand entsteht. Der Bypass ermöglicht es, Abgas ungekühlt zurückzuführen. Durch die Integration in den Zylinderkopf ergibt sich wiederum ein sehr kompakter Aufbau, der keine externen Schläuche oder Rohre erfordert. Dadurch, dass der Bypasskanal luftspaltisoliert ist, lassen sich die thermischen Belastungen des Zylinderkopfes reduzieren.To achieve this object, it is provided according to the invention in an exhaust gas recirculation module of the type mentioned at the outset that the exhaust manifold is provided with an exhaust gas recirculation branch which is connected directly to an exhaust gas recirculation inlet in the cylinder head, a heat exchanger branch going from the cylinder head, through which exhaust gas can be passed to a heat exchanger , wherein the heat exchanger branch opens on a side surface of the cylinder head, a bypass channel being provided, through which the exhaust gas can be passed bypassing the heat exchanger directly from an exhaust side to an intake side, the exhaust manifold being mounted on the cylinder head and an exhaust manifold gasket being provided by which runs through the connection between the exhaust gas recirculation branch and the exhaust gas recirculation inlet, the bypass channel being integrated in the cylinder head, and the bypass channel being air-gap insulated. The invention is based on the basic concept of not routing the exhaust gas branched off on the exhaust manifold through hoses to be mounted separately on the exhaust manifold, but of introducing it directly into the cylinder head from the exhaust manifold. This creates a highly integrated solution that is characterized by a small installation space. Furthermore, there is less assembly effort because the exhaust gas recirculation branch of the exhaust manifold is automatically connected to the exhaust gas recirculation inlet in the cylinder head when the exhaust manifold is mounted on the cylinder head. Furthermore, no thermal decoupling measures need to be taken, as is necessary in the prior art for thermal length compensation; a bellows, for example, is required there, which leads to additional costs. In addition, the heat exchanger branch enables the exhaust gas to be returned to a heat exchanger feed so that it can be cooled in the desired manner. The exhaust gas recirculation duct is sealed by a modified exhaust manifold gasket so that no additional assembly work is required. The bypass enables exhaust gas to be returned uncooled. The integration in the cylinder head results in a very compact structure that does not require any external hoses or pipes. The fact that the bypass duct is air-gap insulated means that the thermal loads on the cylinder head can be reduced.

Vorzugsweise ist vorgesehen, dass am Zylinderkopf der Wärmetauscher angebracht ist, der an den Wärmetauscherabzweig angeschlossen ist. Hierdurch ergibt sich eine kompakte Konstruktion, die keine externen Rohre oder Schläuche erfordert.It is preferably provided that the heat exchanger is attached to the cylinder head and is connected to the heat exchanger branch. This results in a compact design that does not require any external pipes or hoses.

Der Wärmetauscher ist vorzugsweise mit einem Abgasrückführungsventil versehen, sodass die Menge des rückzuführenden und über den Wärmetauscher strömenden Abgases gesteuert werden kann.The heat exchanger is preferably provided with an exhaust gas recirculation valve, so that the amount of the exhaust gas to be recycled and flowing through the heat exchanger can be controlled.

Dem Bypasskanal ist vorzugsweise ein Bypassventil zugeordnet, das am Zylinderkopf angebracht ist. Das Bypassventil ermöglicht es, den Volumenstrom des Abgases zu steuern, das durch den Bypasskanal strömt.A bypass valve, which is attached to the cylinder head, is preferably assigned to the bypass channel. The bypass valve makes it possible to control the volume flow of the exhaust gas that flows through the bypass channel.

Vorzugsweise ist vorgesehen, dass das Abgasrückführungsventil und/oder das Bypassventil ein Regelventil ist. Dies ermöglicht es, den Volumenstrom an rückgeführtem Abgas präzise auf jeweils optimale Werte einzustellen. Insbesondere im Vergleich mit einer Bypassklappe, die im Stand der Technik lediglich zwischen einem geöffnetem und einem geschlossenen Zustand geschaltet werden kann, bietet ein regelbares Bypassventil große Vorteile. Weiterhin werden Strömungsverluste verringert, indem ein Volumenstrom durch das Abgasrückführungssystem (zumindest nahezu) vollständig vermieden ist, wenn beide Ventile geschlossen sind.It is preferably provided that the exhaust gas recirculation valve and / or the bypass valve is a control valve. This enables the volume flow of recirculated exhaust gas to be set precisely to the optimum values. In particular in comparison with a bypass flap, which in the prior art can only be switched between an open and a closed state, a controllable bypass valve offers great advantages. Flow losses are further reduced by completely (at least almost) completely avoiding a volume flow through the exhaust gas recirculation system when both valves are closed.

Die Erfindung wird nachfolgend anhand einer Ausführungsform beschrieben, die in den beigefügten Zeichnungen dargestellt ist. In diesen zeigen:

  • Figur 1 in einer perspektivischen Explosionsansicht einen Zylinderkopf mit Abgasrückführungsbaugruppe;
  • Figur 2 den Zylinderkopf von Figur 1 mit Abgasrückführungsbaugruppe in einer ersten perspektivischen Ansicht;
  • Figur 3 den Zylinderkopf mit Abgasrückführungsbaugruppe in einer zweiten perspektivischen Ansicht;
  • Figur 3a den Zylinderkopf von Figur 3 in einer Ausführungsvariante; und
  • Figur 4 in einer schematischen, perspektivischen Ansicht die Bauteile der Abgasrückführungsbaugruppe.
The invention is described below with reference to an embodiment which is illustrated in the accompanying drawings. In these show:
  • Figure 1 a perspective exploded view of a cylinder head with exhaust gas recirculation assembly;
  • Figure 2 the cylinder head of Figure 1 with exhaust gas recirculation module in a first perspective view;
  • Figure 3 the cylinder head with exhaust gas recirculation assembly in a second perspective view;
  • Figure 3a the cylinder head of Figure 3 in a variant; and
  • Figure 4 in a schematic, perspective view, the components of the exhaust gas recirculation module.

Anhand der Figuren 1 und 2 wird nachfolgend der grundlegende Aufbau einer Abgasrückführungsbaugruppe erläutert, wie sie im Rahmen der vorliegenden Erfindung ausgeführt ist.Based on Figures 1 and 2 The basic structure of an exhaust gas recirculation assembly as explained in the context of the present invention is explained below.

Es ist ein Zylinderkopf 10 zu sehen, der in an sich bekannter Weise dazu dient, mehreren Zylindern einer Verbrennungskraftmaschine Ansaugluft zuzuführen und Verbrennungsgase von den Zylindern abzuführen. Die Ansaugluft wird über ein Ansaugsystem 12 bereitgestellt, und die Verbrennungsgase werden über einen Abgaskrümmer 14 abgeführt.A cylinder head 10 can be seen which, in a manner known per se, serves to supply intake air to a plurality of cylinders of an internal combustion engine and to remove combustion gases from the cylinders. The intake air is provided via an intake system 12, and the combustion gases are discharged via an exhaust manifold 14.

Bei bestimmten Betriebszuständen kann ein Teil des Abgases aus dem Abgasstrang der Verbrennungskraftmaschine entnommen und zur Ansaugseite zurückgeführt werden. Hierfür sind zwei unterschiedliche Strömungswege möglich.Under certain operating conditions, part of the exhaust gas can be removed from the exhaust line of the internal combustion engine and returned to the intake side. Two different flow paths are possible for this.

Ein erster Strömungsweg verläuft durch einen Wärmetauscher 16, in welchem dem Abgas Wärme entzogen werden kann. Zu diesem Zweck sind ein Kühlmitteleinlass 18 und ein Kühlmittelauslass 20 vorgesehen. Um den Volumenstrom durch den Wärmetauscher 16 zu steuern oder zu regeln, ist ein Abgasrückführungsventil 22 vorgesehen.A first flow path runs through a heat exchanger 16, in which heat can be extracted from the exhaust gas. A coolant inlet 18 and a coolant outlet 20 are provided for this purpose. In order to control or regulate the volume flow through the heat exchanger 16, an exhaust gas recirculation valve 22 is provided.

Ein zweiter Strömungsweg verläuft durch einen Bypasskanal 24, durch den Abgas unter Umgehung des Wärmetauschers 16 direkt von der Abgas- zur Ansaugseite geleitet werden kann. Dem Bypasskanal 24 ist ein Bypassventil 26 zugeordnet, mit dem der Volumenstrom durch den Bypasskanal gesteuert oder geregelt werden kann.A second flow path runs through a bypass channel 24, through which exhaust gas can be passed directly from the exhaust gas side to the intake side, bypassing the heat exchanger 16. A bypass valve 26 is assigned to the bypass channel 24, with which the volume flow through the bypass channel can be controlled or regulated.

Das Abgas wird hier aus dem Abgasstrang mittels eines Abgasrückführabzweigs 30 entnommen, der am Abgaskrümmer 14 vorgesehen ist und unmittelbar mit einem Abgasrückführeinlass 32 verbunden ist.The exhaust gas is here removed from the exhaust line by means of an exhaust gas recirculation branch 30, which is provided on the exhaust manifold 14 and is directly connected to an exhaust gas recirculation inlet 32.

Bei der in Figur 3 gezeigten Ausführungsform ist der Abgasrückführeinlass 32 im Zylinderkopf 10 vorgesehen. Der Abgasrückführeinlass 32 verzweigt sich dann im Zylinderkopf in einen Wärmetauscherabzweig 34 und einen Bypassabzweig 36.At the in Figure 3 In the embodiment shown, the exhaust gas recirculation inlet 32 is provided in the cylinder head 10. The exhaust gas recirculation inlet 32 then branches in the cylinder head into a heat exchanger branch 34 and a bypass branch 36.

Der Wärmetauscherabzweig 34 mündet an einer Seitenfläche des Zylinderkopfes 10 und führt unmittelbar zum Wärmetauscher 16, der am Zylinderkopf 10 angebracht ist. Der Bypassabzweig 36 führt zum Bypasskanal 24, der hier in den Zylinderkopf 10 integriert ist. Der Bypasskanal 24 ist hier luftspaltisoliert mit einer Innenhülse 38 ausgeführt, sodass die thermischen Belastungen des Zylinderkopfes reduziert sind und eine höhere Abgasrückführ-Gastemperatur erreicht werden kann.The heat exchanger branch 34 opens out on a side surface of the cylinder head 10 and leads directly to the heat exchanger 16, which is attached to the cylinder head 10. The bypass branch 36 leads to the bypass channel 24, which is integrated here in the cylinder head 10. The bypass duct 24 is here air-gap-insulated with an inner sleeve 38, so that the thermal loads on the cylinder head are reduced and a higher exhaust gas recirculation gas temperature can be achieved.

Die Innenhülse 38 kann in eine zur Außenseite des Zylinderkopfes hin geöffnete Bohrung eingesetzt werden, die dann mit einer Verschlussschraube 40 verschlossen wird.The inner sleeve 38 can be inserted into a bore which is open to the outside of the cylinder head and is then closed with a screw plug 40.

Bei der in Figur 3a gezeigten Ausführungsvariante mündet der Abgasrückführabzweig 30 unmittelbar in den Bypassabzweig 36, nämlich in die Öffnung, die bei der in Figur 3 gezeigten Ausführungsform von der Verschlussschraube 40 verschlossen ist. Zu diesem Zweck erstreckt sich der Abgasrückführabzweig 30 bei der Ausführungsvariante der Figur 3a weiter zur Seite, als dies bei der Ausführungsform der Figur 3 der Fall ist.At the in Figure 3a In the embodiment variant shown, the exhaust gas recirculation branch 30 opens directly into the bypass branch 36, namely into the opening made at the end in FIG Figure 3 embodiment shown is closed by the screw plug 40. For this purpose, the exhaust gas recirculation branch 30 extends in the embodiment variant of FIG Figure 3a further to the side than in the embodiment of the Figure 3 the case is.

Der Vorteil der unmittelbaren Rückführung des Abgases in den Zylinderkopf besteht darin, dass keine externen Rohre oder Schläuche notwendig sind, um das Abgas zu führen. Außerdem wird der Aufwand des Montierens solcher Rohre oder Schläuche vermieden, da der Abgasrückführabzweig unmittelbar mit dem Abgasrückführeinlass dann verbunden wird, wenn der Abgaskrümmer 14 am Zylinderkopf 10 angebracht wird. Zur Abdichtung kann eine geringfügig modifizierte Abgaskrümmerdichtung verwendet werden, die im Bereich der Schnittstelle zwischen dem Abgasrückführabzweig 30 und dem Abgasrückführeinlass 32 abdichtet.The advantage of returning the exhaust gas directly to the cylinder head is that no external pipes or hoses are required to guide the exhaust gas. In addition, the effort of installing such pipes or hoses is avoided since the exhaust gas recirculation branch is connected directly to the exhaust gas recirculation inlet when the exhaust manifold 14 is attached to the cylinder head 10. A slightly modified exhaust manifold gasket can be used for sealing, which seals in the region of the interface between the exhaust gas recirculation branch 30 and the exhaust gas recirculation inlet 32.

Zusätzlich zum erheblichen Bauraumgewinn wird die Robustheit der Abgasrückführungsbaugruppe erhöht, da keinerlei Maßnahmen für einen thermischen Längenausgleich im Bereich des Abgasrückführabzweigs getroffen werden müssen.In addition to the considerable gain in installation space, the robustness of the exhaust gas recirculation module is increased, since no measures need to be taken for thermal length compensation in the area of the exhaust gas recirculation branch.

Claims (5)

  1. An exhaust gas recirculation assembly with a cylinder head (10) and an exhaust manifold (14), wherein the exhaust manifold (14) is provided with an exhaust recirculation branch (30) which is connected directly to an exhaust recirculation inlet (32) in the cylinder head (10), wherein a heat exchanger branch (34) departs from the cylinder head (10), through which branch exhaust gas can be conducted to a heat exchanger (16), wherein the heat exchanger branch (34) opens on a side face of the cylinder head (10) and wherein a bypass duct (24) is provided through which exhaust gas can be conducted directly from an exhaust side to an intake side, bypassing the heat exchanger (16), characterised in that the exhaust manifold (14) is mounted on the cylinder head (10) and an exhaust manifold seal is provided through which the connection between the exhaust recirculation branch (30) and exhaust recirculation inlet (32) runs, wherein the bypass duct (24) is integrated into the cylinder head (10), and wherein the bypass duct (24) is isolated by an air gap.
  2. An exhaust gas recirculation assembly according to Claim 1, characterised in that the heat exchanger (16) which is connected to the heat exchanger branch (34) is attached to the cylinder head (10).
  3. An exhaust gas recirculation assembly according to Claim 2, characterised in that the heat exchanger (16) is provided with an exhaust-gas recirculation valve (22).
  4. An exhaust gas recirculation assembly according to one of the preceding claims, characterised in that a bypass valve (26) which is attached to the cylinder head (10) is associated with the bypass duct (24).
  5. An exhaust gas recirculation assembly according to one of the preceding claims, characterised in that the exhaust-gas recirculation valve (22) and/or the bypass valve (26) are or is a control valve.
EP16159192.0A 2015-04-16 2016-03-08 Exhaust gas recirculation assembly with exhaust manifold Active EP3085943B1 (en)

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JP2021143655A (en) * 2020-03-13 2021-09-24 ヤンマーパワーテクノロジー株式会社 engine
DE102020133977A1 (en) 2020-12-17 2022-06-23 Volkswagen Aktiengesellschaft exhaust gas recirculation assembly
JP2023150675A (en) * 2022-03-31 2023-10-16 スズキ株式会社 Egr device for internal combustion engine

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JP3669275B2 (en) * 2001-02-20 2005-07-06 日産自動車株式会社 EGR gas cooling device for internal combustion engine
JP2003074418A (en) * 2001-08-31 2003-03-12 Honda Motor Co Ltd Egr valve mounting structure
EP1941224A1 (en) * 2005-10-20 2008-07-09 Behr GmbH & Co. KG Heat exchanger
DE102005050234A1 (en) * 2005-10-20 2007-04-26 Daimlerchrysler Ag Internal combustion engine comprises an exhaust gas return line section partially provided with a thermal insulating arrangement on its inner peripheral side in the region of the coolant chamber
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