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EP2466103B1 - Waste gas reclaim module for a combustion engine - Google Patents

Waste gas reclaim module for a combustion engine Download PDF

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Publication number
EP2466103B1
EP2466103B1 EP11186703.2A EP11186703A EP2466103B1 EP 2466103 B1 EP2466103 B1 EP 2466103B1 EP 11186703 A EP11186703 A EP 11186703A EP 2466103 B1 EP2466103 B1 EP 2466103B1
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EP
European Patent Office
Prior art keywords
exhaust gas
gas recirculation
housing
ducts
combustion engine
Prior art date
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Application number
EP11186703.2A
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German (de)
French (fr)
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EP2466103A2 (en
EP2466103A3 (en
Inventor
Hans-Ulrich Kühnel
Hans-Jürgen Hüsges
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Pierburg GmbH
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Pierburg GmbH
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Publication of EP2466103A3 publication Critical patent/EP2466103A3/en
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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
    • F02M26/39—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with two or more EGR valves disposed in series
    • 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
    • F02M26/26—Layout, e.g. schematics with coolers having bypasses characterised by details of the bypass valve
    • 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
    • F02M26/38—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with two or more EGR valves disposed in parallel
    • 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

Definitions

  • the invention relates to an exhaust gas recirculation module for an internal combustion engine having two exhaust gas recirculation channels, two control valve bodies which control two formed in an exhaust gas recirculation fürströmungsquerroughe the exhaust gas recirculation channels, two exhaust gas cooling channels, which are in heat exchange with a coolant channel, each of the two exhaust gas recirculation channels are fluidly connected to one of the exhaust gas cooling channels , Two bypass channels through which the exhaust gas cooling channels are bypassed and two bypass valves, which are each operable via a separate actuator and can be opened or closed via the optional flow cross-section to the bypass channels or to the exhaust gas cooling channels.
  • Such exhaust gas recirculation modules are known and serve in a known manner to reduce pollutant emissions.
  • the exhaust gas is supplied to the engine again during the warm-up phase via bypass ducts.
  • cooler bypassing of the low-load radiators is becoming increasingly common, as many exhaust-gas recirculation coolers of turbocharged engines are designed for a high cooling load point, which could result in overcooling.
  • cooling systems which have a plurality of coolers which can be individually bypassed via bypass lines, so that the most optimal operating point can be traveled.
  • cooling systems can be used.
  • the object of the invention is therefore to provide an exhaust gas recirculation module, which is carried out as possible space-reducing, the number of components and the assembly steps should decrease. In particular, it should be possible to pre-assemble the system. At the same time the best possible controllability should be maintained.
  • bypass valves are arranged in a common exhaust gas recirculation housing, in which the two separate exhaust gas recirculation channels are formed and from which extend the bypass channels and the exhaust gas cooling channels, the assembly is significantly simplified. At the same time, the number of components to be used decreases. Nevertheless, a single switching of the bypass channels remains possible, so that overcooling can be prevented.
  • the bypass valves each have a valve body arranged on a shaft, wherein the shafts are mounted in the exhaust gas recirculation housing.
  • the use of flaps as a control body allows the control of large volume flows and release of large cross sections.
  • the storage in the exhaust gas recirculation housing reduces the component expenditure, whereby the flaps can be mounted in advance in the housing.
  • the actuators of the bypass valves are pneumatically actuated, whereby the control effort is reduced. Furthermore, pneumatic actuators have a long service life.
  • the two exhaust gas cooling channels are formed in a heat exchanger housing, on the downstream two check valves are arranged, in which open the two exhaust gas cooling channels.
  • a common coolant channel can be used. It eliminates extra components, reducing weight is reduced. The recyclable exhaust gas mass flow is increased by the check valves since backflow due to pulsations is avoided.
  • bypass channels open upstream of the check valves in the exhaust gas cooling channels.
  • an exhaust gas recirculation flap is arranged as a control valve body in the exhaust gas recirculation housing in both exhaust gas recirculation channels, via which the flow cross sections of the exhaust gas recirculation channels are controllable, wherein the two exhaust gas recirculation flaps are arranged on a common shaft which is actuated via a common actuator.
  • This total actuator can be used to regulate a total amount to be returned.
  • the different cylinder groups remain separated over the entire running distance. Since no additional housing parts must be used, the structure remains compact with few and vorzumontierenden parts and can be mounted with little effort.
  • the exhaust gas recirculation housing is formed in two parts, wherein the bearing points of the shaft of the exhaust gas recirculation valves are formed in the second flange-shaped part and the bearing points of the waves of the bypass valves are formed in the first part, wherein on the upstream side of the first part, the second part of the Exhaust gas recirculation housing is attached.
  • the heat exchanger housing is fixed downstream of the exhaust gas recirculation housing and has a partition wall, via which the two exhaust gas channels are separated from each other.
  • the partition wall is used as a common wall.
  • the exhaust gas recirculation module has a coolant channel which extends through the heat exchanger housing into the exhaust gas recirculation housing, so that the exhaust gas recirculation housing is cooled, which on the one hand increases the overall cooling efficiency and on the other hand also protects the actuators against overheating.
  • This module is particularly suitable for the return of exhaust gas in internal combustion engines with high back pressure from the air inlet side, since even with these conditions, a sufficient amount of exhaust gas can be attributed by using the pressure peaks of the exhaust gas.
  • the exhaust gas recirculation module according to the invention shown in the figures consists of a total of four outer housing parts, of which a first housing part is an exhaust gas recirculation housing 2, a second housing part is a heat exchanger housing 4, a third housing part is an aftercooler housing 6 and a fourth housing part is a check valve housing 8, at its end a collection tube 10 is formed.
  • two exhaust gas recirculation channels 12 are formed, of which in the FIG. 2 only one can be seen, and two flow cross sections 14 of the exhaust gas recirculation channels 12, which are both controlled by an exhaust gas recirculation valve 16, which consists of two control valve bodies 18 in the form of arranged on a common shaft 20 exhaust gas recirculation flaps 22 and an electric actuator 24.
  • the inlet 26 is designed as a flange, via which the module can be flanged directly to an engine block or an exhaust manifold, not shown, wherein two exhaust gas flows of two cylinder groups are executed separately in the engine block or exhaust manifold, so that a Exhaust gas flow is connected to the first exhaust gas recirculation passage 12 and the second exhaust gas flow to the second exhaust passage.
  • the shaft 20, on which the exhaust gas recirculation flaps 22 are mounted, is mounted in the exhaust gas recirculation housing 2 and rotatable by means of the electromotive actuator 24 via a coupling linkage 30.
  • the shaft 20 is surrounded outside the housing 2 by a return spring 32, via which the exhaust gas recirculation flaps 22 are rotated in their closing the flow cross-sections 14 closing position in case of failure of the actuator 24.
  • a coolant channel 34 is additionally formed, via which the thermally highly stressed housing 2 is cooled and in particular the actuator 24 is protected from thermal overload.
  • coolant tubes 36 which allow the coolant from the Side of the outlet 28 to the exhaust gas recirculation valves 22 and can be performed around them, so that a good thermal decoupling is achieved, which is further reinforced in that the exhaust gas recirculation housing 2 is made in two parts, wherein the first part 38, in which the bearings 39 are arranged for the shaft 20 of the exhaust gas recirculation valve 16 and the regulated flow cross sections 14, is formed substantially as an extended flange which is flanged to the second part 40, to which the actuator 24 and the coolant tubes 36 are mounted.
  • the first part 38 has a coolant channel 34 extending on both sides of the shaft 20, which extends via bores into the exhaust gas recirculation housing 2 and the coolant tubes 36 and the coolant jacket.
  • the first part 38 and the second part 40 of the Exhaust gas recirculation housing 2 are fastened to one another via flanges with the interposition of a seal.
  • bypass valves 42, 43 are arranged in the exhaust gas recirculation housing 2, each consisting of a valve body 44, 45 which is mounted on a shaft 46, 47 mounted in the exhaust gas recirculation housing 2, which via a lever 48, 49 by means of a respective pneumatic actuator 50, 51 is actuated, which in turn is attached to the exhaust gas recirculation valve housing 2, as shown FIG. 3 is apparent.
  • the flap body 44, 45 interact depending on their position with one of two valve seats 52, 54 which either a flow cross-section to one of two formed within the heat exchanger housing 4 exhaust gas cooling channels 56 or to one of two bypass channels 58, 60, which as tubes on Heat exchanger housing 4 are passed.
  • Each of the two actuators 50, 51 is separately switchable, so that, for example, the exhaust gas of a first cylinder group is returned cooled, while the exhaust gas of the second cylinder group is returned uncooled.
  • the temperature of the engine can be slightly raised, if the optimum operating temperature is otherwise not reached.
  • the exhaust gas recirculation housing 2 is fastened via a flange connection 62 on the heat exchanger housing 4, for example, with the interposition of a seal, not shown.
  • a partition wall arranged separate exhaust gas cooling channels 56 whose outer walls serve as a separation to the coolant jacket 34 which is formed between the exhaust gas cooling channels 56 and the heat exchanger housing 4.
  • the partition wall forms an extension to the partition wall between the exhaust gas recirculation channels 12 in the exhaust gas recirculation housing 2.
  • the fluid connection between the coolant channels 34 of the exhaust gas recirculation valve housing 2 and the coolant jacket in the heat exchanger housing 4 is also produced via the flange connection.
  • the aftercooler housing 6 is attached to the exhaust gas recirculation housing 2 opposite side of the heat exchanger housing 4, which in turn is connected via a flange to the check valve housing 8, in the interior of which two exhaust gas check valves are arranged, to which the separation of the two exhaust gas cooling channels 56 is continued so that each exhaust gas cooling channel 56 opens into an exhaust gas check valve which is not visible in the figures but is generally known.
  • the check valve housing 8 opens into a manifold 10, in which the two exhaust gas streams are first mixed and in which an exhaust gas mass flow sensor 64 is arranged.
  • the two bypass channels 58, 60 open in the present embodiment in the manifold 10, wherein to maintain the high exhaust gas recirculation rates by suppressing the return flow by means of the check valves, an introduction in the aftercooler would be advantageous.
  • the two exhaust gas streams are first precooled in the exhaust gas recirculation housing 2 and the exhaust gas quantity is adjusted via the opening width of the flow cross sections 14 by means of the exhaust gas recirculation flaps 22 in accordance with a control command on the actuator 24.
  • the further flowing exhaust gas is still separated and cooled down either via the exhaust gas cooling channels 56 or it passes uncooled but also separated from each other via the bypass channels 58, 60 in the manifold. From the exhaust gas cooling channels 56, the exhaust gas reaches the check valves.
  • This exhaust gas is cooled, partially cooled or uncooled the distributor rail and thus the internal combustion engine again made available, which again serves to reduce pollutants, since the best possible exhaust gas temperature can be adjusted with the one hand, a sufficient engine temperature to ensure good oil lubrication and on the other hand relatively low Combustion temperatures can be generated.
  • the module can be installed as a unit pre-assembled on the internal combustion engine. Despite the various integrated functions, it only requires a very small installation space with different control functions.

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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)

Description

Die Erfindung betrifft ein Abgasrückführmodul für eine Verbrennungskraftmaschine mit zwei Abgasrückführkanälen, zwei Regelventilkörpern, welche zwei in einem Abgasrückführgehäuse ausgebildete Durchströmungsquerschnitte der Abgasrückführkanäle beherrschen, zwei Abgaskühlkanälen, die in Wärmeaustausch mit einem Kühlmittelkanal stehen, wobei jeder der zwei Abgasrückführkanäle fluidisch mit je einem der Abgaskühlkanälen verbunden sind, zwei Bypasskanälen, über die die Abgaskühlkanäle umgehbar sind und zwei Bypassventilen, welche jeweils über einen separaten Aktuator betätigbar sind und über die wahlweise der Durchströmungsquerschnitt zu den Bypasskanälen oder zu den Abgaskühlkanälen freigebbar oder verschließbar ist.The invention relates to an exhaust gas recirculation module for an internal combustion engine having two exhaust gas recirculation channels, two control valve bodies which control two formed in an exhaust gas recirculation Durchströmungsquerschnitte the exhaust gas recirculation channels, two exhaust gas cooling channels, which are in heat exchange with a coolant channel, each of the two exhaust gas recirculation channels are fluidly connected to one of the exhaust gas cooling channels , Two bypass channels through which the exhaust gas cooling channels are bypassed and two bypass valves, which are each operable via a separate actuator and can be opened or closed via the optional flow cross-section to the bypass channels or to the exhaust gas cooling channels.

Derartige Abgasrückführmodule sind bekannt und dienen in bekannter Weise zur Reduktion von Schadstoffemissionen. Zur schnelleren Aufheizung der Motoren wird das Abgas während der Warmlaufphase über Bypasskanäle dem Motor wieder zugeführt. Des Weiteren wird vermehrt eine Bypassierung der Kühler im niedrigen Lastbereich vorgenommen, da viele Abgasrückführkühler von turboaufgeladenen Motoren für einen hohen Kühllastpunkt ausgelegt sind, so dass eine Überkühlung folgen könnte.Such exhaust gas recirculation modules are known and serve in a known manner to reduce pollutant emissions. For faster heating of the engines, the exhaust gas is supplied to the engine again during the warm-up phase via bypass ducts. Furthermore, cooler bypassing of the low-load radiators is becoming increasingly common, as many exhaust-gas recirculation coolers of turbocharged engines are designed for a high cooling load point, which could result in overcooling.

Um dies zu umgehen sind Kühlsysteme bekannt geworden, welche mehrere Kühler aufweisen, die einzeln über Bypassleitungen umgehbar sind, so dass ein möglichst optimaler Betriebspunkt gefahren werden kann. Insbesondere bei großvolumigen Motoren, in denen die Abgasrückführung häufig getrennt für einzelne Zylindergruppen durchgeführt wird, um eine ausreichend hohe Abgasrückführrate zu erzielen, können derartige Systeme Verwendung finden.To avoid this, cooling systems have become known which have a plurality of coolers which can be individually bypassed via bypass lines, so that the most optimal operating point can be traveled. Especially with large-volume engines in which the Exhaust gas recirculation is often performed separately for individual cylinder groups in order to achieve a sufficiently high exhaust gas recirculation rate, such systems can be used.

Bekannt ist aus der FR 2 890 698 ein Einlassluftmodul, bei dem an einem gemeinsamen Gehäuse sowohl der Ladeluftkühler als auch der Abgasrückführkühler angeordnet sind, welche beide über separate Bypasskanäle umgehbar sind. Der Abgasstrom wird dabei über ein Kombiventil geleitet, welches sowohl den Bypass- als auch den Kühlstrom regelt, während die Zuluft über eine Drosselklappe mit nachfolgendem Bypassventil geregelt wird.Is known from the FR 2 890 698 an inlet air module, in which both the intercooler and the exhaust gas recirculation cooler are arranged on a common housing, both of which are bypassable via separate bypass channels. The exhaust gas flow is passed through a combination valve, which regulates both the bypass and the cooling flow, while the supply air is controlled by a throttle valve with subsequent bypass valve.

So ist aus der DE 10 2008 035 747 A1 eine Abgasrückführkühlung mit mehreren umgehbaren Kühlern bekannt, die in vielfältiger Weise miteinander verschaltet werden. Insbesondere sind hieraus Systeme mit zwei parallel geschalteten Abgasrückführkanälen bekannt, bei denen in jedem Kanal sowohl ein Kühler als auch ein Abgasrückführventil angeordnet sind. Vor dem Abgasrückführventil zweigt jeweils ein Bypasskanal ab, in dem ein Bypassventil angeordnet ist. In dieser Ausführung lassen sich sowohl die Abgasrückführventile als auch die Bypassventile jeweils einzeln schalten.So is out of the DE 10 2008 035 747 A1 an exhaust gas recirculation cooling with several bypassable coolers known, which are interconnected in a variety of ways. In particular, systems with two exhaust gas recirculation channels connected in parallel are known, in which both a cooler and an exhaust gas recirculation valve are arranged in each channel. In front of the exhaust gas recirculation valve branches off in each case a bypass channel, in which a bypass valve is arranged. In this version, both the exhaust gas recirculation valves and the bypass valves can be switched individually.

Eine solche Ausführung benötigt jedoch einen großen Bauraum, da zwei vollständig getrennte Systeme mit eigenen Kühlern, Ventilen, Stellern, Kühlmittelkanälen und Abgasführungskanälen aufgebaut werden müssen. Dies führt zu einem hohen Bauteile- und Montageaufwand und somit zu hohen Herstellungskosten.However, such a design requires a large amount of space, since two completely separate systems with their own coolers, valves, actuators, coolant ducts and exhaust ducts must be constructed. This leads to a high component and assembly costs and thus to high production costs.

Aufgabe der Erfindung ist es daher, ein Abgasrückführmodul zu schaffen, welches möglichst bauraumreduzierend ausgeführt ist, wobei die Anzahl der Bauteile und die Montageschritte sinken sollen. Insbesondere soll es möglich sein, das System vorzumontieren. Gleichzeitig soll eine möglichst gute Regelbarkeit erhalten bleiben.The object of the invention is therefore to provide an exhaust gas recirculation module, which is carried out as possible space-reducing, the number of components and the assembly steps should decrease. In particular, it should be possible to pre-assemble the system. At the same time the best possible controllability should be maintained.

Diese Aufgabe wird durch den kennzeichnenden Teil des Hauptanspruchs gelöst.This object is achieved by the characterizing part of the main claim.

Dadurch, dass die Bypassventile in einem gemeinsamen Abgasrückführgehäuse angeordnet sind, in dem die zwei getrennten Abgasrückführkanäle ausgebildet sind und von dem aus sich die Bypasskanäle und die Abgaskühlkanäle erstrecken, wird die Montage deutlich vereinfacht. Gleichzeitig sinkt die Anzahl der zu verwendenden Bauteile. Dennoch bleibt ein einzelnes Schalten der Bypasskanäle möglich, so dass eine Überkühlung verhindert werden kann.Characterized in that the bypass valves are arranged in a common exhaust gas recirculation housing, in which the two separate exhaust gas recirculation channels are formed and from which extend the bypass channels and the exhaust gas cooling channels, the assembly is significantly simplified. At the same time, the number of components to be used decreases. Nevertheless, a single switching of the bypass channels remains possible, so that overcooling can be prevented.

Vorzugsweise weisen die Bypassventile jeweils einen auf einer Welle angeordneten Klappenkörper auf, wobei die Wellen im Abgasrückführgehäuse gelagert sind. Die Verwendung von Klappen als Regelkörper ermöglicht die Regelung großer Volumenströme und Freigabe großer Querschnitte. Die Lagerung im Abgasrückführgehäuse verringert den Bauteileaufwand, wobei die Klappen vorab im Gehäuse montiert werden können.Preferably, the bypass valves each have a valve body arranged on a shaft, wherein the shafts are mounted in the exhaust gas recirculation housing. The use of flaps as a control body allows the control of large volume flows and release of large cross sections. The storage in the exhaust gas recirculation housing reduces the component expenditure, whereby the flaps can be mounted in advance in the housing.

Vorteilhafterweise sind die Aktuatoren der Bypassventile pneumatisch betätigbar, wodurch der Regelungsaufwand reduziert wird. Des Weiteren weisen pneumatische Aktuatoren eine hohe Lebensdauer auf.Advantageously, the actuators of the bypass valves are pneumatically actuated, whereby the control effort is reduced. Furthermore, pneumatic actuators have a long service life.

In einer vorteilhaften Ausgestaltung der Erfindung sind die beiden Abgaskühlkanäle in einem Wärmetauschergehäuse ausgebildet, an dem stromabwärts zwei Rückschlagventile angeordnet sind, in die die beiden Abgaskühlkanäle münden. Durch das gemeinsame Wärmetauschergehäuse kann auch ein gemeinsamer Kühlmittelkanal verwendet werden. Es entfallen zusätzliche Bauteile, wodurch Gewicht reduziert wird. Der zurückführbare Abgasmassenstrom wird durch die Rückschlagventile erhöht, da eine Rückströmung aufgrund von Pulsationen vermieden wird.In an advantageous embodiment of the invention, the two exhaust gas cooling channels are formed in a heat exchanger housing, on the downstream two check valves are arranged, in which open the two exhaust gas cooling channels. Through the common heat exchanger housing and a common coolant channel can be used. It eliminates extra components, reducing weight is reduced. The recyclable exhaust gas mass flow is increased by the check valves since backflow due to pulsations is avoided.

In einer hierzu weiterführenden Ausführung münden die Bypasskanäle stromaufwärts der Rückschlagventile in die Abgaskühlkanäle. Hierdurch können die hohen Abgasrückführraten auch beim ungekühlt zurückgeführten Abgasstrom aufrecht erhalten werden, da Rückströmungen aufgrund von Pulsationen vermieden werden und keine Interferenzen in dem Bereich entstehen, in dem die Pulsationen mit Rückströmung gegebenenfalls noch vorhanden sind.In a further embodiment, the bypass channels open upstream of the check valves in the exhaust gas cooling channels. As a result, the high exhaust gas recirculation rates can be maintained even when uncooled recirculated exhaust gas flow, since backflow due to pulsations are avoided and no interference in the area arise in which the pulsations with backflow may still be present.

Vorzugsweise ist im Abgasrückführgehäuse in beiden Abgasrückführkanälen jeweils eine Abgasrückführklappe als Regelventilkörper angeordnet, über welche die Durchströmungsquerschnitte der Abgasrückführkanäle regelbar sind, wobei die beiden Abgasrückführklappen auf einer gemeinsamen Welle angeordnet sind, die über einen gemeinsamen Aktuator betätigbar ist. Über diesen gemeinsamen Aktuator kann eine gesamt zurückzuführende Menge geregelt werden. Dabei bleiben die verschiedenen Zylindergruppen jedoch über die gesamte Laufstrecke getrennt. Da keine zusätzlichen Gehäuseteile verwendet werden müssen, bleibt der Aufbau mit wenigen und vorzumontierenden Teilen kompakt und mit geringem Aufwand montierbar.Preferably, an exhaust gas recirculation flap is arranged as a control valve body in the exhaust gas recirculation housing in both exhaust gas recirculation channels, via which the flow cross sections of the exhaust gas recirculation channels are controllable, wherein the two exhaust gas recirculation flaps are arranged on a common shaft which is actuated via a common actuator. This total actuator can be used to regulate a total amount to be returned. However, the different cylinder groups remain separated over the entire running distance. Since no additional housing parts must be used, the structure remains compact with few and vorzumontierenden parts and can be mounted with little effort.

In einer hierzu weiterführenden vorteilhaften Ausführungsform ist das Abgasrückführgehäuse zweiteilig ausgebildet, wobei im zweiten flanschförmigen Teil die Lagerstellen der Welle der Abgasrückführklappen ausgebildet sind und im ersten Teil die Lagerstellen der Wellen der Bypassklappen ausgebildet sind, wobei an der stromaufwärtigen Seite des ersten Teils das zweite Teil des Abgasrückführgehäuses befestigt ist. So entsteht eine thermische Entkopplung zum anderen Abgasrückführgehäuseteil, an dem die Aktuatoren angebracht sind, so dass deren thermische Belastung verringert wird. Der Bauraumbedarf wird gering gehalten.In a further advantageous embodiment, the exhaust gas recirculation housing is formed in two parts, wherein the bearing points of the shaft of the exhaust gas recirculation valves are formed in the second flange-shaped part and the bearing points of the waves of the bypass valves are formed in the first part, wherein on the upstream side of the first part, the second part of the Exhaust gas recirculation housing is attached. This creates a thermal decoupling to the other Exhaust gas recirculation housing part, on which the actuators are mounted, so that their thermal load is reduced. The space requirement is kept low.

In einer vorteilhaften Ausgestaltung der Erfindung ist das Wärmetauschergehäuse stromabwärts am Abgasrückführgehäuse befestigt und weist eine Trennwand auf, über die die beiden Abgaskanäle voneinander getrennt sind. So wird für die beiden Abgaskanäle neben dem gemeinsamen Außengehäuse auch die Trennwand als gemeinsame Wand genutzt. Mit der direkten Anordnung am Abgasrückführgehäuse führt dies zu einem kompakt aufgebauten und gewichtsreduzierten Modul.In an advantageous embodiment of the invention, the heat exchanger housing is fixed downstream of the exhaust gas recirculation housing and has a partition wall, via which the two exhaust gas channels are separated from each other. Thus, for the two exhaust ducts in addition to the common outer housing and the partition wall is used as a common wall. With the direct arrangement on the exhaust gas recirculation housing, this leads to a compact and weight-reduced module.

In einer weiterführenden Ausgestaltung der Erfindung weist das Abgasrückführmodul einen Kühlmittelkanal auf, der sich durch das Wärmetauschergehäuse in das Abgasrückführgehäuse erstreckt, so dass auch das Abgasrückführgehäuse gekühlt ist, was einerseits den Gesamtkühlwirkungsgrad erhöht und andererseits die Aktuatoren zusätzlich vor Überhitzung schützt.In a further embodiment of the invention, the exhaust gas recirculation module has a coolant channel which extends through the heat exchanger housing into the exhaust gas recirculation housing, so that the exhaust gas recirculation housing is cooled, which on the one hand increases the overall cooling efficiency and on the other hand also protects the actuators against overheating.

Es wird somit ein Kühlmodul geschaffen, welches kompakt aufgebaut und einfach montierbar ist sowie vormontiert als Einheit in den Motor eingebaut werden kann. Die Anzahl der vorhandenen Schnittstellen und Bauteile ist minimiert. Dieses Modul eignet sich besonders zur Rückführung von Abgas in Verbrennungsmotoren mit hohem Gegendruck von der Lufteinlassseite, da auch bei diesen Bedingungen noch eine ausreichende Abgasmenge durch Nutzung der Druckspitzen der Abgasfluten zurückgeführt werden kann.It is thus created a cooling module, which is compact and easy to install and can be installed as a unit in the engine pre-assembled. The number of existing interfaces and components is minimized. This module is particularly suitable for the return of exhaust gas in internal combustion engines with high back pressure from the air inlet side, since even with these conditions, a sufficient amount of exhaust gas can be attributed by using the pressure peaks of the exhaust gas.

Ein Ausführungsbeispiel eines erfindungsgemäßen Abgasrückführmoduls ist in den Figuren dargestellt und wird nachfolgend beschrieben.

  • Figur 1 zeigt eine perspektivische Darstellung eines erfindungsgemäßen Abgasrückführmoduls.
  • Figur 2 zeigt eine Seitenansicht eines Ausschnitts des erfindungsgemäßen Abgasrückführmoduls der Figur 1 in geschnittener Darstellung.
  • Figur 3 zeigt eine Schnittansicht des erfindungsgemäßen Abgasrückführmoduls der Figur 1 von der Kopfseite.
An embodiment of an exhaust gas recirculation module according to the invention is shown in the figures and will be described below.
  • FIG. 1 shows a perspective view of an exhaust gas recirculation module according to the invention.
  • FIG. 2 shows a side view of a section of the exhaust gas recirculation module according to the invention FIG. 1 in a cutaway view.
  • FIG. 3 shows a sectional view of the exhaust gas recirculation module according to the invention FIG. 1 from the head side.

Das erfindungsgemäße in den Figuren dargestellte Abgasrückführmodul besteht aus insgesamt vier äußeren Gehäuseteilen, wovon ein erstes Gehäuseteil ein Abgasrückführgehäuse 2 ist, ein zweites Gehäuseteil ein Wärmetauschergehäuse 4 ist, ein drittes Gehäuseteil ein Nachkühlergehäuse 6 ist und ein viertes Gehäuseteil ein Rückschlagventilgehäuse 8 ist, an dessen Ende ein Sammelrohr 10 ausgebildet ist.The exhaust gas recirculation module according to the invention shown in the figures consists of a total of four outer housing parts, of which a first housing part is an exhaust gas recirculation housing 2, a second housing part is a heat exchanger housing 4, a third housing part is an aftercooler housing 6 and a fourth housing part is a check valve housing 8, at its end a collection tube 10 is formed.

Im Abgasrückführgehäuse 2 sind zwei Abgasrückführkanäle 12 ausgebildet, von denen in der Figur 2 lediglich einer zu erkennen ist, sowie zwei Durchströmungsquerschnitte 14 der Abgasrückführkanäle 12, welche beide durch ein Abgasrückführventil 16 beherrscht werden, welches aus zwei Regelventilkörpern 18 in Form von auf einer gemeinsamen Welle 20 angeordneten Abgasrückführklappen 22 sowie einem elektrischen Aktuator 24 besteht. Zwischen den beiden Abgasrückführkanälen befindet sich eine gemeinsame Trennwand 23, die sich vom Eintritt 26 des Abgasrückführgehäuses 2 bis zum Austritt 28 erstreckt, welcher um 90° versetzt zum Eintritt 26 angeordnet ist, so dass ein Abgasstrom im Innern des Gehäuses 2 um 90° umgelenkt wird. Der Eintritt 26 ist als Flansch ausgeführt, über den das Modul direkt an einen nicht dargestellten Motorblock oder einen Abgaskrümmer angeflanscht werden kann, wobei im Motorblock beziehungsweise Abgaskrümmer zwei Abgasfluten von zwei Zylindergruppen getrennt voneinander ausgeführt sind, so dass eine Abgasflut mit dem ersten Abgasrückführkanal 12 und die zweite Abgasflut mit dem zweiten Abgaskanal verbunden ist.In the exhaust gas recirculation housing 2, two exhaust gas recirculation channels 12 are formed, of which in the FIG. 2 only one can be seen, and two flow cross sections 14 of the exhaust gas recirculation channels 12, which are both controlled by an exhaust gas recirculation valve 16, which consists of two control valve bodies 18 in the form of arranged on a common shaft 20 exhaust gas recirculation flaps 22 and an electric actuator 24. Between the two exhaust gas recirculation channels is a common partition wall 23 which extends from the inlet 26 of the exhaust gas recirculation housing 2 to the outlet 28, which is arranged offset by 90 ° to the inlet 26, so that an exhaust gas flow in the interior of the housing 2 is deflected by 90 ° , The inlet 26 is designed as a flange, via which the module can be flanged directly to an engine block or an exhaust manifold, not shown, wherein two exhaust gas flows of two cylinder groups are executed separately in the engine block or exhaust manifold, so that a Exhaust gas flow is connected to the first exhaust gas recirculation passage 12 and the second exhaust gas flow to the second exhaust passage.

Die Welle 20, auf der die Abgasrückführklappen 22 angebracht sind, ist im Abgasrückführgehäuse 2 gelagert und mittels des elektromotorischen Aktuators 24 über ein Kopplungsgestänge 30 drehbar. Die Welle 20 ist außerhalb des Gehäuses 2 von einer Rückstellfeder 32 umgeben, über welche bei Ausfall des Aktuators 24 die Abgasrückführklappen 22 in ihre die Durchströmungsquerschnitte 14 verschließende Stellung gedreht werden.The shaft 20, on which the exhaust gas recirculation flaps 22 are mounted, is mounted in the exhaust gas recirculation housing 2 and rotatable by means of the electromotive actuator 24 via a coupling linkage 30. The shaft 20 is surrounded outside the housing 2 by a return spring 32, via which the exhaust gas recirculation flaps 22 are rotated in their closing the flow cross-sections 14 closing position in case of failure of the actuator 24.

Im Abgasrückführgehäuse 2 ist zusätzlich ein Kühlmittelkanal 34 ausgebildet, über welchen das thermisch hochbelastete Gehäuse 2 gekühlt wird und insbesondere der Aktuator 24 vor thermischer Überlastung geschützt wird. Um trotz der 90° Umlenkung zwischen Eintritt 26 und Austritt 28 eine möglichst lange Kühlstrecke durch den Kühlmittelkanal 34 zu erhalten, der im Wärmetauschergehäuse 4 als Kühlmittelmantel fortgeführt werden kann, befinden sich am Abgasrückführgehäuse 2 Kühlmittelrohre 36, die es ermöglichen, dass das Kühlmittel von der Seite des Austritts 28 bis zu den Abgasrückführklappen 22 und um diese herum geführt werden kann, so dass eine gute thermische Entkopplung erzielt wird, die noch dadurch verstärkt wird, dass das Abgasrückführgehäuse 2 zweiteilig ausgeführt ist, wobei der erste Teil 38, in dem die Lagerstellen 39 für die Welle 20 des Abgasrückführventils 16 sowie die geregelten Durchströmungsquerschnitte 14 angeordnet sind, im Wesentlichen als erweiterter Flansch ausgebildet ist, der an den zweiten Teil 40 angeflanscht ist, an dem der Aktuator 24 und die Kühlmittelrohre 36 angebracht sind. Der erste Teil 38 weist einen an beiden Seiten der Welle 20 verlaufenden Kühlmittelkanal 34 auf, der über Bohrungen in das Abgasrückführgehäuse 2 und die Kühlmittelrohre 36 sowie den Kühlmittelmantel verläuft. Der erste Teil 38 und der zweite Teil 40 des Abgasrückführgehäuses 2 werden über Flansche unter Zwischenlage einer Dichtung aneinander befestigt.In the exhaust gas recirculation housing 2, a coolant channel 34 is additionally formed, via which the thermally highly stressed housing 2 is cooled and in particular the actuator 24 is protected from thermal overload. In spite of the 90 ° deflection between inlet 26 and outlet 28 to obtain the longest possible cooling section through the coolant channel 34, which can be continued in the heat exchanger housing 4 as a coolant jacket, located on the exhaust gas recirculation housing 2 coolant tubes 36, which allow the coolant from the Side of the outlet 28 to the exhaust gas recirculation valves 22 and can be performed around them, so that a good thermal decoupling is achieved, which is further reinforced in that the exhaust gas recirculation housing 2 is made in two parts, wherein the first part 38, in which the bearings 39 are arranged for the shaft 20 of the exhaust gas recirculation valve 16 and the regulated flow cross sections 14, is formed substantially as an extended flange which is flanged to the second part 40, to which the actuator 24 and the coolant tubes 36 are mounted. The first part 38 has a coolant channel 34 extending on both sides of the shaft 20, which extends via bores into the exhaust gas recirculation housing 2 and the coolant tubes 36 and the coolant jacket. The first part 38 and the second part 40 of the Exhaust gas recirculation housing 2 are fastened to one another via flanges with the interposition of a seal.

Des Weiteren sind im Abgasrückführgehäuse 2 erfindungsgemäß zwei Bypassventile 42, 43 angeordnet, die jeweils aus einem Klappenkörper 44, 45 bestehen, der auf einer im Abgasrückführgehäuse 2 gelagerten Welle 46, 47 angeordnet ist, welche über einen Hebel 48, 49 mittels jeweils eines pneumatischen Aktuators 50, 51 betätigbar ist, der wiederum am Abgasrückführventilgehäuse 2 befestigt ist, wie aus Figur 3 ersichtlich ist.Furthermore, two bypass valves 42, 43 are arranged in the exhaust gas recirculation housing 2, each consisting of a valve body 44, 45 which is mounted on a shaft 46, 47 mounted in the exhaust gas recirculation housing 2, which via a lever 48, 49 by means of a respective pneumatic actuator 50, 51 is actuated, which in turn is attached to the exhaust gas recirculation valve housing 2, as shown FIG. 3 is apparent.

Die Klappenkörper 44, 45 wirken je nach ihrer Position mit einem von zwei Ventilsitzen 52, 54 zusammen, die entweder einen Durchströmungsquerschnitt zu einem von zwei innerhalb des Wärmetauschergehäuses 4 ausgebildeten Abgaskühlkanälen 56 oder zu einem von zwei Bypasskanälen 58, 60 umschließen, welche als Rohre am Wärmetauschergehäuse 4 vorbeigeführt sind. Dies bedeutet, dass parallel zueinander im Abgasrückführgehäuse 2 zwei Abgasrückführkanäle 12 ausgebildet sind, deren Durchströmung über eine im jeweiligen Kanal 12 angeordnete Abgasrückführklappe 22 regelbar ist und die je nach Stellung des jeweiligen Bypassventils 42, 43 entweder in den fluidisch verbundenen Abgaskühlkanal 56 oder den fluidisch verbundenen Bypasskanal 58, 60 münden. Jeder der beiden Aktuatoren 50, 51 ist separat schaltbar, so dass beispielsweise das Abgas einer ersten Zylindergruppe gekühlt zurückgeführt wird, während das Abgas der zweiten Zylindergruppe ungekühlt zurückgeführt wird. So kann bei geringen Lastzuständen die Temperatur des Motors geringfügig angehoben werden, falls die optimale Betriebstemperatur andernfalls nicht erreicht wird.The flap body 44, 45 interact depending on their position with one of two valve seats 52, 54 which either a flow cross-section to one of two formed within the heat exchanger housing 4 exhaust gas cooling channels 56 or to one of two bypass channels 58, 60, which as tubes on Heat exchanger housing 4 are passed. This means that two exhaust gas recirculation channels 12 are formed parallel to each other in the exhaust gas recirculation housing 2, the flow through which is arranged in the respective channel 12 exhaust gas recirculation flap 22 and depending on the position of the respective bypass valve 42, 43 either in the fluidically connected exhaust gas cooling passage 56 or the fluidically connected Bypass channel 58, 60 open. Each of the two actuators 50, 51 is separately switchable, so that, for example, the exhaust gas of a first cylinder group is returned cooled, while the exhaust gas of the second cylinder group is returned uncooled. Thus, at low load conditions, the temperature of the engine can be slightly raised, if the optimum operating temperature is otherwise not reached.

Das Abgasrückführgehäuse 2 ist über eine Flanschverbindung 62 am Wärmetauschergehäuse 4 beispielsweise unter Zwischenlage einer nicht dargestellten Dichtung befestigt. Im Innern des äußeren sichtbaren Wärmetauschergehäuses 4 sind die zwei durch eine Trennwand voneinander getrennten Abgaskühlkanäle 56 angeordnet, deren Außenwände als Abtrennung zum Kühlmittelmantel 34 dienen, der zwischen den Abgaskühlkanälen 56 und dem Wärmetauschergehäuse 4 ausgebildet ist. Die Trennwand bildet eine Verlängerung zu der Trennwand zwischen den Abgasrückführkanälen 12 im Abgasrückführgehäuse 2. Über die Flanschverbindung wird auch die fluidische Verbindung zwischen den Kühlmittelkanälen 34 des Abgasrückführventilgehäuses 2 und dem Kühlmittelmantel im Wärmetauschergehäuse 4 hergestellt.The exhaust gas recirculation housing 2 is fastened via a flange connection 62 on the heat exchanger housing 4, for example, with the interposition of a seal, not shown. Inside the outer visible heat exchanger housing 4, the two are through a partition wall arranged separate exhaust gas cooling channels 56 whose outer walls serve as a separation to the coolant jacket 34 which is formed between the exhaust gas cooling channels 56 and the heat exchanger housing 4. The partition wall forms an extension to the partition wall between the exhaust gas recirculation channels 12 in the exhaust gas recirculation housing 2. The fluid connection between the coolant channels 34 of the exhaust gas recirculation valve housing 2 and the coolant jacket in the heat exchanger housing 4 is also produced via the flange connection.

An der zum Abgasrückführgehäuse 2 entgegengesetzten Seite des Wärmetauschergehäuses 4 ist das Nachkühlergehäuse 6 befestigt, welches wiederum über eine Flanschverbindung mit dem Rückschlagventilgehäuse 8 verbunden ist, in dessen Innern zwei Abgasrückschlagventile angeordnet sind, bis zu denen die Trennung der beiden Abgaskühlkanäle 56 fortgesetzt wird, so dass jeder Abgaskühlkanal 56 in ein in den Figuren nicht sichtbares, jedoch allgemein bekanntes Abgasrückschlagventil mündet. Das Rückschlagventilgehäuse 8 mündet in ein Sammelrohr 10, in welchem die beiden Abgasströme erstmalig gemischt werden und in dem ein Abgasmassenstromsensor 64 angeordnet ist.The aftercooler housing 6 is attached to the exhaust gas recirculation housing 2 opposite side of the heat exchanger housing 4, which in turn is connected via a flange to the check valve housing 8, in the interior of which two exhaust gas check valves are arranged, to which the separation of the two exhaust gas cooling channels 56 is continued so that each exhaust gas cooling channel 56 opens into an exhaust gas check valve which is not visible in the figures but is generally known. The check valve housing 8 opens into a manifold 10, in which the two exhaust gas streams are first mixed and in which an exhaust gas mass flow sensor 64 is arranged.

Die beiden Bypasskanäle 58, 60 münden im vorliegenden Ausführungsbeispiel in das Sammelrohr 10, wobei zur Aufrechterhaltung der hohen Abgasrückführraten durch Unterdrückung der Rückströmung mittels der Rückschlagventile eine Einleitung im Bereich des Nachkühlers vorteilhaft wäre.The two bypass channels 58, 60 open in the present embodiment in the manifold 10, wherein to maintain the high exhaust gas recirculation rates by suppressing the return flow by means of the check valves, an introduction in the aftercooler would be advantageous.

Strömt Abgas von den beiden Zylindergruppen in die Abgasrückführkanäle 12, werden die beiden Abgasströme zunächst im Abgasrückführgehäuse 2 vorgekühlt und die Abgasmenge über die Öffnungsweite der Durchströmungsquerschnitte 14 mittels der Abgasrückführklappen 22 entsprechend eines Steuerbefehls am Aktuator 24 eingestellt. Das weiterströmende Abgas wird entweder über die Abgaskühlkanäle 56 weiterhin getrennt voneinander geführt und heruntergekühlt oder es gelangt ungekühlt jedoch ebenfalls getrennt voneinander über die Bypasskanäle 58, 60 in das Sammelrohr. Von den Abgaskühlkanälen 56 gelangt das Abgas zu den Rückschlagklappen. Da keine Mischung der beiden Abgasströme im Verlaufe des Kühlmoduls auftritt, weisen zu diesem Zeitpunkt die beiden Abgasströme weiterhin die Pulsationen des Ausstosses aus den Zylinderreihen der Verbrennungskraftmaschine auf, da die Abstände der einzelnen Pulse im Vergleich zu einem gemeinsamen Abgasstrang verdoppelt werden, so dass Interferenzen deutlich reduziert werden. Dies führt jedoch zu Druckspitzen, die auch bei einem hohen auftretenden Gegendruck im Bereich des Sammelrohres 10 dennoch zu einem Öffnen der zum jeweiligen Kanal 12 gehörenden Abgasrückschlagklappen führen.If exhaust gas flows from the two cylinder groups into the exhaust gas recirculation channels 12, the two exhaust gas streams are first precooled in the exhaust gas recirculation housing 2 and the exhaust gas quantity is adjusted via the opening width of the flow cross sections 14 by means of the exhaust gas recirculation flaps 22 in accordance with a control command on the actuator 24. The further flowing exhaust gas is still separated and cooled down either via the exhaust gas cooling channels 56 or it passes uncooled but also separated from each other via the bypass channels 58, 60 in the manifold. From the exhaust gas cooling channels 56, the exhaust gas reaches the check valves. Since no mixture of the two exhaust gas flows in the course of the cooling module, at this time, the two exhaust gas streams continue to the pulsations of the emission from the rows of cylinders of the internal combustion engine, since the distances of the individual pulses are doubled compared to a common exhaust system, so that interference significantly be reduced. However, this leads to pressure peaks, which still lead to an opening of the respective channel 12 belonging exhaust check valves, even at a high counter pressure occurring in the region of the manifold 10.

Gleiches gilt für den Fall einer Rückführung über die Bypasskanäle 12 vor die Rückschlagklappen.The same applies to the case of a return via the bypass channels 12 before the check valves.

Somit wird sichergestellt, dass ausreichende Abgasmengen zur Schadstoffreduzierung zurückgeführt werden können, was sonst bei großvolumigen aufgeladenen Motoren gegebenenfalls zu Schwierigkeiten führt. Dieses Abgas wird gekühlt, teilweise gekühlt oder ungekühlt der Verteilerleiste und somit dem Verbrennungsmotor wieder zur Verfügung gestellt, was erneut zur Schadstoffreduzierung dient, da eine möglichst optimale Abgastemperatur eingestellt werden kann, mit der einerseits eine ausreichende Motortemperatur zur Sicherstellung einer guten Ölschmierung und andererseits relativ geringe Verbrennungstemperaturen erzeugt werden können. Das Modul kann als eine Baueinheit vormontiert am Verbrennungsmotor angebracht werden. Trotz der verschiedenen integrierten Funktionen benötigt es nur einen sehr geringen Bauraum bei unterschiedlichen Regelungsfunktionen.This ensures that sufficient amounts of exhaust gas can be recycled to reduce pollutants, which may otherwise lead to difficulties in large-capacity turbocharged engines. This exhaust gas is cooled, partially cooled or uncooled the distributor rail and thus the internal combustion engine again made available, which again serves to reduce pollutants, since the best possible exhaust gas temperature can be adjusted with the one hand, a sufficient engine temperature to ensure good oil lubrication and on the other hand relatively low Combustion temperatures can be generated. The module can be installed as a unit pre-assembled on the internal combustion engine. Despite the various integrated functions, it only requires a very small installation space with different control functions.

Es sollte deutlich sein, dass innerhalb des Schutzbereiches des Hauptanspruchs im Vergleich zum beschriebenen Ausführungsbeispiel verschiedene Modifikationen möglich sind, insbesondere die Bypasskanäle vor dem Rückschlagventil in das Gehäuse münden können oder andere Aktuatoren benutzt werden können.It should be clear that various modifications are possible within the scope of the main claim compared to the described embodiment, in particular the bypass channels before the check valve can open into the housing or other actuators can be used.

Claims (9)

  1. Exhaust gas recirculation module for an internal combustion engine, comprising
    two exhaust gas recirculation ducts (12),
    two regulating valve bodies (18) controlling two flow cross sections (14) of the exhaust gas recirculation ducts (12), which are formed in an exhaust gas recirculation housing,
    two exhaust gas cooling ducts (56) in thermal exchange with a coolant duct (34),
    wherein each of the two exhaust gas recirculation ducts (12) is in fluidic communication with a respective one of the exhaust gas cooling ducts (56),
    two bypass ducts (58, 60) by which the exhaust gas cooling ducts (56) can be bypassed,
    and two bypass valves (42, 43), each actuatable via a separate actuator (50, 51), and by which, selectively, the flow cross section to the bypass ducts (58, 60) or to the exhaust gas cooling ducts (56) can be cleared or closed,
    characterized in that
    the bypass valves (42, 43) are arranged in a common exhaust gas recirculation housing (2) in which the two separate exhaust gas recirculation ducts (12) are formed and from which the bypass ducts (58, 60) and the exhaust gas cooling ducts (56) extend.
  2. Exhaust gas recirculation module for an internal combustion engine of claim 1, characterized in that the bypass valves (42, 43) each have a flap body (44, 45) arranged on a shaft (46, 47), wherein the shafts (46, 47) are supported in the exhaust gas recirculation housing (2).
  3. Exhaust gas recirculation module for an internal combustion engine of claim 1 or 2, characterized in that the actuators (50, 51) of the bypass valves (42, 43) are pneumatically actuatable.
  4. Exhaust gas recirculation module for an internal combustion engine of one of the preceding claims, characterized in that the two exhaust gas cooling ducts (56) are formed in a heat exchanger housing (4) at which two check valves are arranged in a downstream direction, into which valves the two exhaust gas cooling ducts (56) open.
  5. Exhaust gas recirculation module for an internal combustion engine of claim 4, characterized in that the bypass ducts (58, 60) open into the exhaust gas cooling ducts (56) open upstream of the check valves.
  6. Exhaust gas recirculation module for an internal combustion engine of one of the preceding claims, characterized in that in the exhaust gas recirculation housing (2), a respective exhaust gas recirculation flap (22) is arranged as a regulating valve body (18) in each exhaust gas recirculation duct (12), by which the flow cross sections (14) of the exhaust gas recirculation ducts (12) can be controlled, wherein the two exhaust gas recirculation flaps (22) are arranged on a common shaft (20) actuatable through a common actuator (24).
  7. Exhaust gas recirculation module for an internal combustion engine of claim 6, characterized in that the exhaust gas recirculation housing (2) is of a two-part design, wherein the bearing points (39) of the shaft (20) of the exhaust gas recirculation flaps (22) are formed in the second flangeshaped part (38) and the bearing points of the shafts (46, 47) of the bypass valves (42, 43) are formed in the first part (38), wherein the second part (40) of the exhaust gas recirculation housing (2) is mounted to the upstream side of the first part (38).
  8. Exhaust gas recirculation module for an internal combustion engine of one of claims 4 to 7, characterized in that the heat exchanger housing (4) is fastened downstream at the exhaust gas recirculation housing (2) and comprises a partition wall by which the two exhaust gas cooling ducts (56) are separated from each other.
  9. Exhaust gas recirculation module for an internal combustion engine of one of the preceding claims, characterized in that the exhaust gas recirculation module comprises a coolant duct (34) extending through the heat exchanger housing (4) into the exhaust gas recirculation housing (2).
EP11186703.2A 2010-12-17 2011-10-26 Waste gas reclaim module for a combustion engine Active EP2466103B1 (en)

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DE102016200326B4 (en) 2016-01-14 2018-01-04 Bayerische Motoren Werke Aktiengesellschaft Exhaust gas recirculation cooler
DE102016200371B4 (en) 2016-01-14 2018-12-13 Bayerische Motoren Werke Aktiengesellschaft Bypass flap for exhaust gas recirculation cooler

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DE19734801A1 (en) * 1997-08-12 1999-02-18 Pierburg Ag Exhaust gas recycling system for IC engine with turbo-charger
BR0300426A (en) * 2003-02-27 2004-11-03 Wahler Metalurgica Ltda Gas baffle valve assembly
FR2890698B1 (en) * 2005-09-12 2010-12-10 Valeo Systemes Thermiques HEAT EXCHANGE MODULE FOR REGULATING TEMPERATURE OF A GAS MIXTURE ALLOWED IN A MOTOR VEHICLE HEAT ENGINE
EP2004980A2 (en) * 2006-03-22 2008-12-24 Borgwarner, Inc. Integrated charge air and egr valve
US7987836B2 (en) 2007-10-18 2011-08-02 Ford Global Technologies, Llc Multi-cooler EGR cooling
DE102008033823B4 (en) * 2008-07-19 2013-03-07 Pierburg Gmbh Exhaust gas recirculation device for an internal combustion engine

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