EP2025911B1 - Exhaust gas cooling device for a combustion engine - Google Patents

Exhaust gas cooling device for a combustion engine Download PDF

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Publication number
EP2025911B1
EP2025911B1 EP08158817A EP08158817A EP2025911B1 EP 2025911 B1 EP2025911 B1 EP 2025911B1 EP 08158817 A EP08158817 A EP 08158817A EP 08158817 A EP08158817 A EP 08158817A EP 2025911 B1 EP2025911 B1 EP 2025911B1
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EP
European Patent Office
Prior art keywords
exhaust gas
space
heat exchanger
valve
cooling device
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EP08158817A
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German (de)
French (fr)
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EP2025911A1 (en
Inventor
Hans-Ulrich Kühnel
Hans-Jürgen Hüsges
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Pierburg GmbH
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Pierburg GmbH
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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
    • F02M26/22—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
    • F02M26/23—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

Definitions

  • the invention relates to an exhaust gas cooling device for an internal combustion engine having a housing with an exhaust inlet, an exhaust outlet, a valve device and a U-shaped heat exchanger unit with a Hinlauf- and a return path, wherein the valve device is designed as a centrally mounted flap valve, such that depending on Position of the flap valve, the exhaust inlet with the Hinlaufumble or the return line is connectable.
  • Such an exhaust gas cooling device is for example from the DE 10 2004 019 554 A1 known.
  • the initially hot exhaust gas is conducted into a so-called U-shaped heat exchanger, wherein the heat exchanger has ribs running in the direction of flow, which are intended to ensure improved heat transfer between the exhaust gas and the coolant.
  • this heat exchanger takes place with increasing exhaust gas temperature reduction a sooting or carbonization of the heat exchanger, which hinder the flow. This sooting occurs in particular in the return path of the U-shaped heat exchanger, since the exhaust gas has already been strongly cooled here.
  • An exhaust gas cooling device is known.
  • the valve device is designed so that the exhaust gas inlet is connected fluidly yes yes after the flap valve position with the Hinvierrange or with the return path of the heat exchanger.
  • the exhaust outlet is connected to the other route of the heat exchanger. It is also possible to connect the exhaust gas inlet directly to the exhaust gas outlet, wherein the flow through the heat exchanger is also made possible. As a result, however, none true bypass function, that is not a complete bypass of the heat exchanger, possible.
  • the housing on the open side of the U-shaped heat exchanger provides a first, second and third space, wherein the first space fluidly connects the exhaust gas inlet to the second space and the third space connects the second space fluidly with the exhaust gas outlet, wherein in the second space, the valve device is arranged such that the second space is divisible into two subspaces, the first fluidly connected to the Hinlaufumble and the second fluidly connected to the return path, wherein a Flap with extending into the second space part-circular lateral surfaces, which are formed in extension of the spatial arrangements of the first and third space is in operative connection, wherein a heat exchanger unit bypassing the bypass passage is provided in the flap.
  • an exhaust gas cooling device in which the flow direction of the U-shaped heat exchanger can be changed in the short term by simply pressing the valve device and thus the "cold" part of the heat exchanger, ie the return path, acted upon with hot exhaust gas and thus cleaned.
  • the valve device is designed as a centrally mounted flap valve, wherein a flap with metal-circular lateral surfaces of the first and third space is in operative connection. In this way, a particularly easy to install exhaust gas cooling device is provided.
  • the housing consists of two housing shells, wherein the first receives the heat exchanger unit and in the second, the valve device is mounted.
  • the present invention also relates to an exhaust gas recirculation system having an exhaust gas cooling device, wherein an exhaust gas recirculation valve is provided.
  • the exhaust gas recirculation valve is upstream or downstream of the exhaust gas cooling device in known manner and regulates the amount of exhaust gas to be recirculated. It is particularly advantageous if the bypass channel is formed in the flap of the valve device.
  • FIG. 1 shows the inventive exhaust gas cooling device 1. It can be seen that while a housing 2 is provided, which consists essentially of two housing shells 12, 13, wherein the first housing shell 12 receives a heat exchanger unit 6 and in the second housing shell 13, a valve device 5 is mounted , Furthermore, the second housing shell 13 has an exhaust gas inlet 3 and an exhaust gas outlet 4.
  • the heat exchanger unit 6 is U-shaped with a Hinlaufumble 7 and a return path 8. In the present case, the heat exchanger unit 6 consists of a lower part 25 and a lid, not shown.
  • circumferential ribs 14 are provided on lower part 25 and cover in a known manner, which ensures improved heat transfer between the exhaust gas, which is located on the outward and return path 7, 8 and located in the coolant jacket 16 coolant.
  • the return line 7, 8 are formed by a provided in a known manner middle wall 15 of the U-shaped heat exchanger unit 6. This center wall 15 also forms a bearing point 24 for the valve device 5.
  • a coolant inlet and a coolant outlet are in the illustrated Section not shown.
  • the second housing shell 13 is designed such that a first space 9, a second space 10 and a third space 11 are provided.
  • the first space 9 fluidly connects the exhaust gas inlet 3 with the second space 10.
  • the third space 11 fluidly connects the second space 10 with the exhaust gas outlet 5.
  • the second space 10 has, in addition to the compounds described above, a connection to the Hinlaufumble 7 and a connection to the return line 8 of the U-shaped heat exchanger unit 6.
  • the valve device 5 is arranged such that the second space 10 in two subspaces 17, 18 is divisible, wherein the first subspace 17 is fluidly connected to the Hinlaufux 7 and the second subspace 18 fluidly connected to the return line 8.
  • FIGS. 2 to 4 A particular embodiment and the operation of the exhaust gas cooling device or an exhaust gas recirculation system for internal combustion engines is the FIGS. 2 to 4 refer to.
  • FIG. 2 Now shows a front view in section of the exhaust gas recirculation system 19 according to the invention, in addition to the exhaust gas cooling device according to the invention upstream in the flow direction, not shown in detail exhaust gas recirculation valve, and the heat exchanger unit 6 bypassing bypass passage 20, wherein the bypass channel 20 is particularly advantageously integrated in the valve device 5 is arranged.
  • the valve device 5 is in this case designed as a centrally mounted flap valve, wherein a flap 23 with part-circular lateral surfaces 21 and 22 of the first room 9 and the third room 11 is operatively connected such that, depending on the position of the flap valve 5, the first chamber 9 via the subspace 17 is connected to the Hinvierumble 7 or is connected via the subspace 18 with the return path 8.
  • FIG. 2 is the position of the flap valve 5 such that the exhaust gas flows through the exhaust inlet 3 in the first chamber 9 and is cooled by this through the subspace 17 through the Hinlaufux and subsequently through the return path 8 before it enters the subspace 18 and then in the third space 11 flows to exit via the exhaust outlet 4, the exhaust gas recirculation system.
  • FIG. 3 again shows the front view of the exhaust gas recirculation system according to the invention, wherein the position of the flap valve 5 is now selected so that a flow through the bypass channel 20 and thus a bypass of the U-shaped heat exchanger 6 takes place.
  • the bypass channel 20 is formed in the flap 23 of the valve device 5 in a particular embodiment.
  • the bypass channel is then directly connected to the first space 9 and the third space 11, with the result that the exhaust gas by the shortest route from the exhaust gas inlet 3, without being cooled, flows to the exhaust gas outlet 4.
  • the bypass channel would be formed in a known manner outside the valve device and opened or closed by a corresponding bypass valve.
  • FIG. 4 now shows a front view of the exhaust gas recirculation system according to the invention, in which the flap valve of the valve device 5 has a position such that the exhaust gas inlet 3 is connected via the first space 9 directly to the return path 8. Consequently, the Hinvierier 8 is connected via the third space 11 with the exhaust gas outlet 4.
  • the hot exhaust gas enters via the exhaust gas inlet 3 in the first space 9 and is then passed through the subspace 18 in the return path, where due to the high temperature of the exhaust gas sooting and cooled exhaust gas residues at the ribs 14, 15 can be resolved. Also in this case, the hot exhaust gas is cooled by the heat exchanger unit 6 and is subsequently guided over the Hinlaufrange 7 to the exhaust outlet 4.

Abstract

The device (1) has housing (2) with an exhaust gas inlet (3), an exhaust gas outlet (4) and a heat exchanger unit (6) with a forward line and a return line. The housing has three areas at an open side of the unit, where one area connects the inlet with another area in a fluidic manner. The third area connects the latter area with the outlet in a fluidic manner. A valve device (5) is arranged in the latter area in such a manner that the latter area is divided into two partial areas connected with the forward line and the return line, respectively in a fluidic manner. An independent claim is also included for a method for cleaning a U-shaped heat exchanger of an exhaust gas recirculation system.

Description

Die Erfindung betrifft eine Abgaskühlvorrichtung für eine Verbrennungskraftmaschine, die ein Gehäuse mit einem Abgaseinlass, einem Abgasauslass, einer Ventilvorrichtung und einer U-förmigen Wärmetauschereinheit mit einer Hinlauf- und einer Rücklaufstrecke aufweist, wobei die Ventilvorrichtung als zentrisch gelagertes Klappenventil ausgebildet ist, derart dass je nach Stellung des Klappenventils der Abgaseinlass mit der Hinlaufstrecke oder der Rücklaufstrecke verbindbar ist.The invention relates to an exhaust gas cooling device for an internal combustion engine having a housing with an exhaust inlet, an exhaust outlet, a valve device and a U-shaped heat exchanger unit with a Hinlauf- and a return path, wherein the valve device is designed as a centrally mounted flap valve, such that depending on Position of the flap valve, the exhaust inlet with the Hinlaufstrecke or the return line is connectable.

Eine derartige Abgaskühlvorrichtung ist beispielsweise aus der DE 10 2004 019 554 A1 bekannt. Bei der gezeigten Ausführungsform wird das zunächst heiße Abgas in einen sogenannten U-förmigen Wärmetauscher geleitet, wobei der Wärmetauscher in Strömungsrichtung verlaufende Rippen aufweist, die einen verbesserten Wärmeübergang zwischen dem Abgas und dem Kühlmittel gewährleisten sollen. Während der Durchströmung dieses Wärmetauschers findet mit zunehmender Abgastemperaturreduzierung eine Versottung bzw. Verrußung des Wärmetauschers statt, die die Durchströmung behindern. Diese Versottung tritt insbesondere in der Rücklaufstrecke des U-förmigen Wärmetauschers auf, da hier bereits das Abgas stark abgekühlt wurde. Um bei einer geringeren Versottung einen besseren Wärmeübergang zu erreichen, ist es aus weiteren Schutzrechten, beispielsweise aus der DE 20 2006 009 464 U1 , bekannt, eine besondere Rippenanordnung und/ oder Rippenform zu wählen. All diese Bemühungen konnten einer Versottung über die Lebensdauer gesehen jedoch nicht grundlegend verhindern.Such an exhaust gas cooling device is for example from the DE 10 2004 019 554 A1 known. In the embodiment shown, the initially hot exhaust gas is conducted into a so-called U-shaped heat exchanger, wherein the heat exchanger has ribs running in the direction of flow, which are intended to ensure improved heat transfer between the exhaust gas and the coolant. During the flow through this heat exchanger takes place with increasing exhaust gas temperature reduction a sooting or carbonization of the heat exchanger, which hinder the flow. This sooting occurs in particular in the return path of the U-shaped heat exchanger, since the exhaust gas has already been strongly cooled here. In order to achieve a better heat transfer at a lower sooting, it is from further property rights, for example from the DE 20 2006 009 464 U1 known to choose a particular rib arrangement and / or rib shape. All of these efforts, however, have failed to fundamentally prevent asphyxiation over the lifetime.

Aus der FR 2 891 590 ist eine Abgaskühlvorrichtung gemäß dem Oberbegriff bekannt. Die Ventilvorrichtung ist dabei so ausgebildet, dass der Abgaseinlass ja nach Stellung des Klappenventils fluidisch mit der Hinlaufstrecke bzw. mit der Rücklaufstrecke der Wärmetauscher verbunden ist. Der Abgasauslass wird dabei mit der jeweils anderen Strecke des Wärmetauschers verbunden. Auch ist es möglich, den Abgaseinlass direkt mit dem Abgasauslass zu verbinden, wobei auch die Durchströmung durch den Wärmetauscher ermöglicht wird. Demzufolge ist jedoch keine echte Bypassfunktion, das heißt keine vollständige Umgehung des Wärmetauschers, möglich.From the FR 2,891,590 An exhaust gas cooling device according to the preamble is known. The valve device is designed so that the exhaust gas inlet is connected fluidly yes yes after the flap valve position with the Hinlaufstrecke or with the return path of the heat exchanger. The exhaust outlet is connected to the other route of the heat exchanger. It is also possible to connect the exhaust gas inlet directly to the exhaust gas outlet, wherein the flow through the heat exchanger is also made possible. As a result, however, none true bypass function, that is not a complete bypass of the heat exchanger, possible.

Daher ist es Aufgabe der Erfindung eine Abgaskühlvorrichtung zur Verfügung zu stellen, die mit möglichst geringem Fertigungs- und Kostenaufwand die Versottung in der Wärmetauschereinheit noch weiter verringert und die Möglichkeit bietet einen vollständigen, abgeschlossenen Bypass zur Kanalführung der Wärmetauschereinheit auszubilden.It is therefore an object of the invention to provide an exhaust gas cooling device available that further reduces the sooting in the heat exchanger unit with the least possible manufacturing and cost and offers the opportunity to form a complete, closed bypass for ducting of the heat exchanger unit.

Diese Aufgabe wird dadurch gelöst, das Gehäuse an der offenen Seite des U-förmigen Wärmetauschers einen ersten, zweiten und dritten Raum vorsieht, wobei der erste Raum den Abgaseinlass fluidisch mit dem zweiten Raum verbindet und der dritte Raum den zweiten Raum fluidisch mit dem Abgasauslass verbindet, wobei im zweiten Raum die Ventilvorrichtung derart angeordnet ist, dass der zweite Raum in zwei Teilräume unterteilbar ist, wobei der erste fluidisch mit der Hinlaufstrecke und der zweite fluidisch mit der Rücklaufstrecke verbunden ist, wobei eine Klappe mit in den zweiten Raum hineinreichenden teilkreisförmigen Mantelflächen, die in Verlängerung der Raumanordnungen des ersten und dritten Raumes ausgebildet sind, in Wirkverbindung steht, wobei ein die Wärmetauschereinheit umgehender Bypasskanal in der Klappe vorgesehen ist. Auf diese Weise wird eine Abgaskühlvorrichtung geschaffen, bei der durch einfaches Betätigen der Ventilvorrichtung die Durchströmrichtung des U-förmigen Wärmetauschers kurzfristig geändert werden kann und somit der "kalte" Teil des Wärmetauschers, also die Rücklaufstrecke, mit heißem Abgas beaufschlagt und somit gereinigt wird.This object is achieved in that the housing on the open side of the U-shaped heat exchanger provides a first, second and third space, wherein the first space fluidly connects the exhaust gas inlet to the second space and the third space connects the second space fluidly with the exhaust gas outlet, wherein in the second space, the valve device is arranged such that the second space is divisible into two subspaces, the first fluidly connected to the Hinlaufstrecke and the second fluidly connected to the return path, wherein a Flap with extending into the second space part-circular lateral surfaces, which are formed in extension of the spatial arrangements of the first and third space is in operative connection, wherein a heat exchanger unit bypassing the bypass passage is provided in the flap. In this way, an exhaust gas cooling device is provided, in which the flow direction of the U-shaped heat exchanger can be changed in the short term by simply pressing the valve device and thus the "cold" part of the heat exchanger, ie the return path, acted upon with hot exhaust gas and thus cleaned.

Die Ventilvorrichtung ist als zentrisch gelagertes Klappenventil ausgebildet, wobei eine Klappe mit metallkreisförmigen Mantelflächen des ersten und dritten Raumes in Wirkverbindung steht. Auf diese Weise wird eine besonders einfach zu montierende Abgaskühlvorrichtung vorgesehen. In diesem Zusammenhang ist es auch vorteilhaft, wenn das Gehäuse aus zwei Gehäuseschalen besteht, wobei die erste die Wärmetauschereinheit aufnimmt und in der zweiten die Ventilvorrichtung gelagert ist.The valve device is designed as a centrally mounted flap valve, wherein a flap with metal-circular lateral surfaces of the first and third space is in operative connection. In this way, a particularly easy to install exhaust gas cooling device is provided. In this context, it is also advantageous if the housing consists of two housing shells, wherein the first receives the heat exchanger unit and in the second, the valve device is mounted.

Die vorliegende Erfindung betrifft auch ein Abgasrückführsystem mit einer Abgaskühlvorrichtung, wobei ein Abgasrückführventil vorgesehen sind. Das Abgasrückführventil wird der Abgaskühlvorrichtung auf bekannte Weise vor- oder nachgeschaltet und regelt die Menge des zurückzuführenden Abgases. Dabei ist es besonders vorteilhaft, wenn der Bypasskanal in der Klappe der Ventilvorrichtung ausgebildet ist.The present invention also relates to an exhaust gas recirculation system having an exhaust gas cooling device, wherein an exhaust gas recirculation valve is provided. The exhaust gas recirculation valve is upstream or downstream of the exhaust gas cooling device in known manner and regulates the amount of exhaust gas to be recirculated. It is particularly advantageous if the bypass channel is formed in the flap of the valve device.

Im Folgenden wird eine bevorzugte Ausführungsform der Erfindung anhand von Figuren erläutert.In the following, a preferred embodiment of the invention will be explained with reference to figures.

Es zeigen:

Figur 1
zeigt eine Schnittansicht der erfindungsgemäßen Abgaskühlvorrichtung,
Figur 2
eine Vorderansicht der Ventilvorrichtung der erfindungsgemäßen Abgaskühlvorrichtung während des Kühlerbetriebes,
Figur 3
eine Vorderansicht der Ventilvorrichtung der erfindungsgemäßen Abgaskühlvorrichtung in der Bypassstellung, und
Figur 4
eine Vorderansicht der Ventilvorrichtung der erfindungsgemäßen Abgaskühlvorrichtung im Reinigungsmodus.
Show it:
FIG. 1
shows a sectional view of the exhaust gas cooling device according to the invention,
FIG. 2
a front view of the valve device of the exhaust gas cooling device according to the invention during the cooler operation,
FIG. 3
a front view of the valve device of the exhaust gas cooling device according to the invention in the bypass position, and
FIG. 4
a front view of the valve device of the exhaust gas cooling device according to the invention in the cleaning mode.

Figur 1 zeigt die erfindungsgemäße Abgaskühlvorrichtung 1. Es ist zu erkennen, dass dabei ein Gehäuse 2 vorgesehen ist, das im wesentlichen aus zwei Gehäuseschalen 12, 13 besteht, wobei die erste Gehäuseschale 12 eine Wärmetauschereinheit 6 aufnimmt und in der zweiten Gehäuseschale 13 eine Ventilvorrichtung 5 gelagert ist. Des weiteren weist die zweite Gehäuseschale 13 einen Abgaseinlass 3 und einen Abgasauslass 4 auf. Die Wärmetauschereinheit 6 ist U-förmig mit einer Hinlaufstrecke 7 und einer Rücklaufstrecke 8 ausgebildet. Im vorliegenden Fall besteht die Wärmetauschereinheit 6 aus einem Unterteil 25 und einen nicht dargestellten Deckel. Im vorliegenden Ausführungsbeispiel sind auf bekannte Weise umlaufende Rippen 14 an Unterteil 25 und Deckel vorgesehen, die einen verbesserten Wärmeübergang zwischen dem Abgas, das sich auf der Hin- und Rücklaufstrecke 7, 8 befindet und dem sich im Kühlmittelmantel 16 befindlichen Kühlmittel gewährleisten. Die Hin- und Rücklaufstrecke 7, 8 werden dabei gebildet durch eine auf bekannte Weise vorgesehene Mittelwand 15 der U-förmigen Wärmetauschereinheit 6. Diese Mittelwand 15 bildet hier auch noch eine Lagerstelle 24 für die Ventilvorrichtung 5. Ein Kühlmitteleinlass und ein Kühlmittelauslass sind in dem dargestellten Schnitt nicht dargestellt. FIG. 1 shows the inventive exhaust gas cooling device 1. It can be seen that while a housing 2 is provided, which consists essentially of two housing shells 12, 13, wherein the first housing shell 12 receives a heat exchanger unit 6 and in the second housing shell 13, a valve device 5 is mounted , Furthermore, the second housing shell 13 has an exhaust gas inlet 3 and an exhaust gas outlet 4. The heat exchanger unit 6 is U-shaped with a Hinlaufstrecke 7 and a return path 8. In the present case, the heat exchanger unit 6 consists of a lower part 25 and a lid, not shown. In the present embodiment, circumferential ribs 14 are provided on lower part 25 and cover in a known manner, which ensures improved heat transfer between the exhaust gas, which is located on the outward and return path 7, 8 and located in the coolant jacket 16 coolant. The return line 7, 8 are formed by a provided in a known manner middle wall 15 of the U-shaped heat exchanger unit 6. This center wall 15 also forms a bearing point 24 for the valve device 5. A coolant inlet and a coolant outlet are in the illustrated Section not shown.

Die zweite Gehäuseschale 13 ist derart ausgestaltet, dass ein erster Raum 9, ein zweiter Raum 10 und ein dritter Raum 11 vorgesehen sind. Dabei verbindet der erste Raum 9 den Abgaseinlass 3 fluidisch mit dem zweiten Raum 10. Der dritte Raum 11 verbindet den zweiten Raum 10 fluidisch mit dem Abgasauslass 5. Der zweite Raum 10 weist neben den vorgehend beschriebenen Verbindungen eine Verbindung zur Hinlaufstrecke 7 und eine Verbindung zur Rücklaufstrecke 8 der U-förmigen Wärmetauschereinheit 6 auf. Dabei ist im zweiten Raum 10 die Ventilvorrichtung 5 derart angeordnet, dass der zweite Raum 10 in zwei Teilräume 17, 18 unterteilbar ist, wobei der erste Teilraum 17 fluidisch mit der Hinlaufstrecke 7 und der zweite Teilraum 18 fluidisch mit der Rücklaufstrecke 8 verbunden ist.The second housing shell 13 is designed such that a first space 9, a second space 10 and a third space 11 are provided. In this case, the first space 9 fluidly connects the exhaust gas inlet 3 with the second space 10. The third space 11 fluidly connects the second space 10 with the exhaust gas outlet 5. The second space 10 has, in addition to the compounds described above, a connection to the Hinlaufstrecke 7 and a connection to the return line 8 of the U-shaped heat exchanger unit 6. Here, in the second space 10, the valve device 5 is arranged such that the second space 10 in two subspaces 17, 18 is divisible, wherein the first subspace 17 is fluidly connected to the Hinlaufstrecke 7 and the second subspace 18 fluidly connected to the return line 8.

Eine besondere Ausführungsform und die Wirkungsweise der Abgaskühlvorrichtung bzw. eines Abgasrückführsystems für Verbrennungskraftmaschinen ist den Figuren 2 bis 4 zu entnehmen. Figur 2 zeigt nun eine Vorderansicht im Schnitt des erfindungsgemäßen Abgasrückführsystems 19, das neben der erfindungsgemäßen Abgaskühlvorrichtung ein in Strömungsrichtung vorgelagertes, nicht näher dargestelltes Abgasrückführventil aufweist, sowie einen die Wärmetauschereinheit 6 umgehenden Bypasskanal 20, wobei der Bypasskanal 20 besonders vorteilhaft in der Ventilvorrichtung 5 integriert angeordnet ist. Die Ventilvorrichtung 5 ist hierbei als zentrisch gelagertes Klappenventil ausgebildet, wobei eine Klappe 23 mit teilkreisförmigen Mantelflächen 21 bzw. 22 des ersten Raumes 9 und des dritten Raumes 11 derart in Wirkverbindung steht, dass je nach Stellung des Klappenventils 5 der erste Raum 9 über den Teilraum 17 mit der Hinlaufstrecke 7 verbunden ist oder über den Teilraum 18 mit der Rücklaufstrecke 8 verbunden ist. Im dargestellten Beispiel der Figur 2 ist die Stellung des Klappenventils 5 derart, dass das Abgas über den Abgaseinlass 3 in den ersten Raum 9 strömt und von diesem durch den Teilraum 17 durch die Hinlaufstrecke und nachfolgend durch die Rücklaufstrecke 8 abgekühlt wird, bevor es in den Teilraum 18 eintritt und dann in den dritten Raum 11 strömt um über den Abgasauslass 4 das Abgasrückführsystem zu verlassen.A particular embodiment and the operation of the exhaust gas cooling device or an exhaust gas recirculation system for internal combustion engines is the FIGS. 2 to 4 refer to. FIG. 2 Now shows a front view in section of the exhaust gas recirculation system 19 according to the invention, in addition to the exhaust gas cooling device according to the invention upstream in the flow direction, not shown in detail exhaust gas recirculation valve, and the heat exchanger unit 6 bypassing bypass passage 20, wherein the bypass channel 20 is particularly advantageously integrated in the valve device 5 is arranged. The valve device 5 is in this case designed as a centrally mounted flap valve, wherein a flap 23 with part-circular lateral surfaces 21 and 22 of the first room 9 and the third room 11 is operatively connected such that, depending on the position of the flap valve 5, the first chamber 9 via the subspace 17 is connected to the Hinlaufstrecke 7 or is connected via the subspace 18 with the return path 8. In the example shown the FIG. 2 is the position of the flap valve 5 such that the exhaust gas flows through the exhaust inlet 3 in the first chamber 9 and is cooled by this through the subspace 17 through the Hinlaufstrecke and subsequently through the return path 8 before it enters the subspace 18 and then in the third space 11 flows to exit via the exhaust outlet 4, the exhaust gas recirculation system.

Figur 3 zeigt wiederum die Vorderansicht des erfindungsgemäßen Abgasrückführsystems, wobei die Stellung des Klappenventils 5 nun so gewählt ist, dass eine Durchströmung des Bypasskanals 20 und damit eine Umgehung des U-förmigen Wärmetauschers 6 stattfindet. Hierzu ist in einer besonderen Ausführungsform der Bypasskanal 20 in der Klappe 23 der Ventilvorrichtung 5 ausgebildet. Im Bypassbetrieb wird dann der Bypasskanal direkt mit dem ersten Raum 9 und dem dritten Raum 11 verbunden, was zur Folge hat, dass das Abgas auf kürzestem Wege vom Abgaseinlass 3, ohne abgekühlt zu werden, zum Abgasauslass 4 strömt. Es sollte deutlich sein, dass es natürlich auch möglich ist, den Bypasskanal nicht in die Ventilvorrichtung 5 zu integrieren. Dazu würde der Bypasskanal auf bekannte Weise außerhalb der Ventilvorrichtung ausgebildet und durch ein entsprechendes Bypassventil geöffnet oder geschlossen. FIG. 3 again shows the front view of the exhaust gas recirculation system according to the invention, wherein the position of the flap valve 5 is now selected so that a flow through the bypass channel 20 and thus a bypass of the U-shaped heat exchanger 6 takes place. For this purpose, the bypass channel 20 is formed in the flap 23 of the valve device 5 in a particular embodiment. In bypass mode, the bypass channel is then directly connected to the first space 9 and the third space 11, with the result that the exhaust gas by the shortest route from the exhaust gas inlet 3, without being cooled, flows to the exhaust gas outlet 4. It should be clear that it is of course also possible not to integrate the bypass channel in the valve device 5. For this purpose, the bypass channel would be formed in a known manner outside the valve device and opened or closed by a corresponding bypass valve.

Figur 4 zeigt nun eine Vorderansicht des erfindungsgemäßen Abgasrückführsystems, bei dem das Klappenventil der Ventilvorrichtung 5 eine derartige Stellung aufweist, dass der Abgaseinlass 3 über den ersten Raum 9 direkt mit der Rücklaufstrecke 8 verbunden ist. Demzufolge ist die Hinlaufstrecke 8 über den dritten Raum 11 mit dem Abgasauslass 4 verbunden. Auf diese Weise kann nun ein besonders vorteilhaftes Verfahren zum Reinigen des U-förmigen Wärmetauschers 6 bereitgestellt werden. Das heiße Abgas tritt über den Abgaseinlass 3 in den ersten Raum 9 ein und wird dann über den Teilraum 18 in die Rücklaufstrecke geführt, wo aufgrund der hohen Temperatur des Abgases Versottungen und erkaltete Abgasrückstände an den Rippen 14, 15 aufgelöst werden können. Auch in diesem Falle wird das heiße Abgas durch die Wärmetauschereinheit 6 abgekühlt und wird nachfolgend über die Hinlaufstrecke 7 zum Abgasauslass 4 geführt. FIG. 4 now shows a front view of the exhaust gas recirculation system according to the invention, in which the flap valve of the valve device 5 has a position such that the exhaust gas inlet 3 is connected via the first space 9 directly to the return path 8. Consequently, the Hinlaufstrecke 8 is connected via the third space 11 with the exhaust gas outlet 4. In this way, a particularly advantageous method for cleaning the U-shaped heat exchanger 6 can now be provided. The hot exhaust gas enters via the exhaust gas inlet 3 in the first space 9 and is then passed through the subspace 18 in the return path, where due to the high temperature of the exhaust gas sooting and cooled exhaust gas residues at the ribs 14, 15 can be resolved. Also in this case, the hot exhaust gas is cooled by the heat exchanger unit 6 and is subsequently guided over the Hinlaufstrecke 7 to the exhaust outlet 4.

Claims (3)

  1. Exhaust gas cooling device (1) for an internal combustion engine, comprising a housing (2) with an exhaust gas inlet (3), an exhaust gas outlet (4), a valve device (5) and a U-shaped heat exchanger unit 6) with a feed path (7) and a return path (8), the valve device (5) being formed as a centrically supported flap valve such that, depending on the position of the flap valve, the exhaust gas inlet can be connected to the feed path or the return path, characterized in that the housing (2) has a first (9), a second (10) and a third space (11) on the open side of the U-shaped heat exchanger (6), said first space (9) establishing fluid communication between the exhaust gas inlet (3) and the second space (10) and the third space (11) establishing fluid communication between the second space (10) and the exhaust outlet (4), the valve device (5) being arranged such in that second space (10) that said second space (10) can be divided into two partial spaces (17; 18), the first (17) being in fluid communication with the feed path (7) and the second (18) being in fluid communication with the return path (8), a flap (23) being operatively connected to pitch circle-shaped lateral surfaces (21, 22) extending into said second space (10), which surfaces are formed in prolongation of the spatial arrangements of the first and third spaces (9, 11) a bypass channel (20) for bypassing the heat exchanger unit (6) being provided in the flap (23).
  2. Exhaust gas cooling device of claim 1, characterized in that the housing is formed by two housing shells (12, 13), wherein the heat exchanger unit (6) is accommodated in the first shell and the valve device (5) is supported in the second shell.
  3. Exhaust gas recirculation system for an internal combustion engine comprising an exhaust gas cooling device according to one of claims 1 or 2, characterized in that an exhaust gas recirculation valve is provided.
EP08158817A 2007-08-17 2008-06-24 Exhaust gas cooling device for a combustion engine Active EP2025911B1 (en)

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PL08158817T PL2025911T3 (en) 2007-08-17 2008-06-24 Exhaust gas cooling device for a combustion engine

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DE102007038882A DE102007038882A1 (en) 2007-08-17 2007-08-17 Exhaust gas cooling device for an internal combustion engine

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EP2025911B1 true EP2025911B1 (en) 2010-11-10

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US (1) US8011175B2 (en)
EP (1) EP2025911B1 (en)
AT (1) ATE487870T1 (en)
DE (2) DE102007038882A1 (en)
ES (1) ES2352308T3 (en)
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DE102007038882A1 (en) 2009-02-19
ES2352308T3 (en) 2011-02-17
EP2025911A1 (en) 2009-02-18
US8011175B2 (en) 2011-09-06
DE502008001745D1 (en) 2010-12-23
PL2025911T3 (en) 2011-04-29
ATE487870T1 (en) 2010-11-15
US20090044525A1 (en) 2009-02-19

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