EP2194351A1 - Exhaust gas cooler with an integrated particulate filter for an internal combustion engine - Google Patents

Exhaust gas cooler with an integrated particulate filter for an internal combustion engine Download PDF

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Publication number
EP2194351A1
EP2194351A1 EP08291142A EP08291142A EP2194351A1 EP 2194351 A1 EP2194351 A1 EP 2194351A1 EP 08291142 A EP08291142 A EP 08291142A EP 08291142 A EP08291142 A EP 08291142A EP 2194351 A1 EP2194351 A1 EP 2194351A1
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EP
European Patent Office
Prior art keywords
exhaust gas
gas cooler
filter
exhaust
cooler according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08291142A
Other languages
German (de)
French (fr)
Other versions
EP2194351B1 (en
Inventor
Hermann Knaus
Matthias Schuele
Christian Carl
Jérôme GENOIST
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle Behr GmbH and Co KG
Mahle Behr France Rouffach SAS
Original Assignee
Behr GmbH and Co KG
Behr France Rouffach SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Behr GmbH and Co KG, Behr France Rouffach SAS filed Critical Behr GmbH and Co KG
Priority to EP08291142A priority Critical patent/EP2194351B1/en
Priority to AT08291142T priority patent/ATE556284T1/en
Priority to US12/591,669 priority patent/US20100132346A1/en
Publication of EP2194351A1 publication Critical patent/EP2194351A1/en
Application granted granted Critical
Publication of EP2194351B1 publication Critical patent/EP2194351B1/en
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Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • F28D7/1684—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation the conduits having a non-circular cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/005—Other auxiliary members within casings, e.g. internal filling means or sealing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases

Definitions

  • the invention relates to an exhaust gas cooler for an internal combustion engine according to the preamble of claim 1.
  • Exhaust gas recirculation systems are known in which the exhaust gas is cooled in an exhaust gas cooler and subsequently supplied either downstream of a turbocharger (high pressure EGR) or upstream of a turbocharger (high pressure EGR) of the combustion air of the engine.
  • Exhaust gas recirculation systems are often used to reduce pollutants of diesel engines, which also provides a particulate filter of the exhaust gas is provided.
  • a particulate filter is regularly designed as a regenerative filter, whereby cleaning of the filter takes place by controlled combustion phases. In particular, in such phases but also due to design generally larger particles can be solved that endanger the turbocharger, for example, in the case of low-pressure EGR. It is therefore known to provide a downstream of the actual particulate filter and structurally separate filter member, which is not designed to be regenerative, but at least larger particles caught in a secure manner.
  • the cooling fluid is preferably a liquid coolant, for example a low-temperature cooling circuit and / or a cooling circuit of the internal combustion engine.
  • the filter member is disposed within the housing, wherein in particular the housing can be flowed through by the fluid. As a result, little space is needed. In particular, the filter member can be flowed around in a simple manner by the fluid and thus contribute to the cooling of the exhaust gas.
  • the exhaust gas cooler is flowed through by the exhaust gas at least once in one execution and in one return direction, wherein the filter member is provided in at least one of the two, execution or return direction.
  • Such an exhaust gas cooler may be designed, for example, as a U-flow cooler or as a Z-flow cooler, wherein the size remains compact in a longitudinal direction due to the deflection.
  • a particular single flow channel of the execution is formed as a tube member forming the filter member, wherein a plurality of flow channels of the return direction is formed as a bundle of exchanger tubes. In addition to the simple and compact design, this has the advantage that the filtering takes place through the filter member upstream of the exchanger tubes, so that they can not be blocked by larger particles.
  • the tube part and / or the bundle of exchanger tubes in end floor parts are added.
  • the same floor parts can each hold both the filter element and the exchanger tubes.
  • a deflection region for deflecting the flow direction of the exhaust gas is formed on an end face of the exhaust gas cooler.
  • the filter element can be designed simply and inexpensively as a tube part with a filter insert fixed therein.
  • the filter cartridge may be fixed by welding or brazing in the pipe member, for example.
  • a bypass line through which exhaust gas can flow is provided on the exhaust gas cooler, wherein the bypass line branches off, in particular, downstream of the filter element and upstream of a plurality of the flow channels.
  • the filter member is designed as non-regenerable in operation permanent filter.
  • the filter member can be designed for the entire life of the engine or as an exchangeable component or wearing part.
  • the exhaust gas cooler is designed to be arranged downstream of a particle filter.
  • the particulate filter assumes the task of a regenerable particulate matter filter and the filter member has primarily the task of a protective filter for larger particles that arise, for example, in a combustion phase of the particulate filter and can endanger a subsequent turbocharger.
  • an exhaust gas cooler according to the invention is generally designed to be arranged upstream of a turbocharger (low-pressure exhaust gas recirculation) for the same reason.
  • the exhaust gas cooler of the embodiment according to Fig. 1 to Fig. 3 comprises a housing 1, which is traversed by a cooling liquid in the manner of a water jacket (coolant connections not shown).
  • the cooling liquid may be connected to an engine cooling circuit or else to a separate low-temperature cooling circuit.
  • each is a diesel engine for a motor vehicle, in particular a passenger car.
  • the filter element 3 comprises a tube part 3a and a filter insert 3b defined therein by soldering or welding, which is approximately in the drawings 4 and FIG. 5 is shown schematically. Both the exchanger tubes 2 and the tube part 3 a of the filter element 3 are each fixed in the same perforated bottom part 4, for example by welding.
  • the exhaust gas cooler is designed as a U-flow cooler and has an inlet side, according to Fig. 1 a connection member 5 with a feed 5a and a Outlet 5b is screwed for the exhaust gas on the inlet-side bottom part 4.
  • a deflection region 6 is fixed on the bottom part there.
  • the exhaust gas thus flows through the exhaust gas cooler first in an execution through the filter member, is then deflected in the deflection region 6 by 180 ° and flows through the exhaust gas cooler in the return direction through the exchanger tubes.
  • the deflection region 6 is formed as a hollow chamber, into which also a bypass channel 7 opens.
  • a bypass channel 7 opens.
  • the exhaust gas cooler according to the present embodiments consists predominantly of corrosion-resistant steel. Depending on the exhaust gas temperature and design, at least some parts may also be made of aluminum or plastic (e.g., the water jacket 1).
  • the exhaust gas cooler is integrated in an overall system in which the exhaust gas recirculation is designed as a low-pressure feedback.
  • the exhaust gas cooler In the flow direction of the exhaust gas cooler upstream of a regenerable particulate filter and arranged downstream of the air side of an exhaust gas turbocharger.
  • the admixture of the exhaust gas to the combustion air of the engine takes place here before the compression by the turbocharger.
  • the filter member 3 is formed as a non-regenerable permanent filter, which is designed for the entire life of the vehicle.
  • a mesh size of the filter is designed so that only particles of a size that could endanger the turbocharger are filtered out.
  • Fig. 5 corresponds to the example except for the arrangement of the exchanger tubes Fig. 4 , In Fig. 5 are the two end-side bottom portions 4 and the cavity of the deflection 6 particularly clearly visible, with only one of the exchanger tubes 3 is shown for clarity.

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

Abstract

The exhaust gas cooler has a predetermined number of flow channels which are arranged for conducting exhaust gas. The flow channels are arranged in a housing to facilitate thermal exchange with a fluid for cooling the exhaust gas. A filter section (3) is structurally integrated in the exhaust gas cooler for filtering out particles from the flow of exhaust gas. The filter section is mounted within the housing. The housing is arranged to conduct fluid to facilitate the thermal exchange.

Description

Die Erfindung betrifft einen Abgaskühler für einen Verbrennungsmotor nach dem Oberbegriff des Anspruchs 1.The invention relates to an exhaust gas cooler for an internal combustion engine according to the preamble of claim 1.

Es sind Systeme zur Abgas-Rückführung bekannt, bei denen das Abgas in einem Abgaskühler gekühlt und nachfolgend entweder stromabwärts eines Turboladers (Hochdruck-AGR) oder stromaufwärts eines Turboladers (Hochdruck-AGR) der Verbrennungsluft des Motors zugeführt wird. Abgas-Rückführsysteme werden vielfach zur Schadstoffreduzierung von Dieselmotoren eingesetzt, wobei zudem eine Partikelfilterung des Abgases vorgesehen ist. Ein solcher Partikelfilter ist regelmäßig als regenerativer Filter ausgelegt, wobei durch kontrolliert ausgelöste Abbrandphasen eine Reinigung des Filters erfolgt. Insbesondere in solchen Phasen aber auch allgemein konstruktionsbedingt können sich dabei größere Partikel lösen, die zum Beispiel im Fall der Niederdruck-AGR den Turbolader gefährden. Es ist daher bekannt, ein dem eigentlichen Partikelfilter nachgeordnetes und baulich getrenntes Filterglied vorzusehen, das nicht regenerativ ausgelegt ist, aber zumindest größere Partikel auf sichere Weise auffängt.Exhaust gas recirculation systems are known in which the exhaust gas is cooled in an exhaust gas cooler and subsequently supplied either downstream of a turbocharger (high pressure EGR) or upstream of a turbocharger (high pressure EGR) of the combustion air of the engine. Exhaust gas recirculation systems are often used to reduce pollutants of diesel engines, which also provides a particulate filter of the exhaust gas is provided. Such a particulate filter is regularly designed as a regenerative filter, whereby cleaning of the filter takes place by controlled combustion phases. In particular, in such phases but also due to design generally larger particles can be solved that endanger the turbocharger, for example, in the case of low-pressure EGR. It is therefore known to provide a downstream of the actual particulate filter and structurally separate filter member, which is not designed to be regenerative, but at least larger particles caught in a secure manner.

Es ist die Aufgabe der Erfindung, einen Abgaskühler für einen Verbrennungsmotor anzugeben, durch den eine Integration von Komponenten ermöglicht ist.It is the object of the invention to provide an exhaust gas cooler for an internal combustion engine, through which an integration of components is made possible.

Diese Aufgabe wird für einen eingangs genannten Abgaskühler erfindungsgemäß mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst. Durch die Integration des Filterglieds in den Abgaskühler kann eine zusätzliche, in den Abgasstrang zu integrierende Baugruppe eingespart werden. Bei dem kühlenden Fluid handelt es sich bevorzugt um ein flüssiges Kühlmittel, zum Beispiel eines Niedertemperatur-Kühlkreislaufs und/oder eines Kühlkreislaufs des Verbrennungsmotors.This object is achieved according to the invention for an abovementioned exhaust gas cooler with the characterizing features of claim 1. By integrating the filter element in the exhaust gas cooler, an additional, to be integrated into the exhaust system assembly can be saved. The cooling fluid is preferably a liquid coolant, for example a low-temperature cooling circuit and / or a cooling circuit of the internal combustion engine.

In bevorzugter Ausführungsform ist das Filterglied innerhalb des Gehäuses angeordnet, wobei insbesondere das Gehäuse von dem Fluid durchströmbar ist. Hierdurch wird wenig Bauraum benötigt. Insbesondere kann das Filterglied auf einfache Weise von dem Fluid umströmt werden und so zur Kühlung des Abgases beitragen.In a preferred embodiment, the filter member is disposed within the housing, wherein in particular the housing can be flowed through by the fluid. As a result, little space is needed. In particular, the filter member can be flowed around in a simple manner by the fluid and thus contribute to the cooling of the exhaust gas.

Bei einer bevorzugten Ausführungsform der Erfindung wird der Abgaskühler von dem Abgas zumindest jeweils einmal in einer Hinrichtung und in einer Rückrichtung durchströmt, wobei das Filterglied in zumindest einem von beiden, Hinrichtung oder Rückrichtung, vorgesehen ist. Ein solcher Abgaskühler kann etwa als U-flow-Kühler oder auch als Z-flow-Kühler ausgebildet sein, wobei die Baugröße in einer Längsrichtung aufgrund der Umlenkung kompakt bleibt. In bevorzugter Detailgestaltung ist ein insbesondere einziger Strömungskanal der Hinrichtung als ein das Filterglied bildendes Rohrteil ausgebildet, wobei eine Mehrzahl von Strömungskanälen der Rückrichtung als Bündel von Tauscherrohren ausgebildet ist. Neben der einfachen und kompakten Bauweise hat dies den Vorteil, dass die Filterung durch das Filterglied stromaufwärts der Tauscherrohre erfolgt, so dass diese nicht durch größere Partikel blockiert werden können.In a preferred embodiment of the invention, the exhaust gas cooler is flowed through by the exhaust gas at least once in one execution and in one return direction, wherein the filter member is provided in at least one of the two, execution or return direction. Such an exhaust gas cooler may be designed, for example, as a U-flow cooler or as a Z-flow cooler, wherein the size remains compact in a longitudinal direction due to the deflection. In a preferred detailed design, a particular single flow channel of the execution is formed as a tube member forming the filter member, wherein a plurality of flow channels of the return direction is formed as a bundle of exchanger tubes. In addition to the simple and compact design, this has the advantage that the filtering takes place through the filter member upstream of the exchanger tubes, so that they can not be blocked by larger particles.

Weiterhin vorteilhaft sind dabei im Interesse einer einfachen Herstellung das Rohrteil und/oder das Bündel von Tauscherrohren in endseitigen Bodenteilen aufgenommen. Insbesondere können dabei die gleichen Bodenteile jeweils sowohl das Filterglied als auch die Tauscherrohre halten.Also advantageous in the interest of ease of manufacture are the tube part and / or the bundle of exchanger tubes in end floor parts added. In particular, the same floor parts can each hold both the filter element and the exchanger tubes.

In weiterer Detailgestaltung ist dabei an einer Stirnseite des Abgaskühlers ein Umlenkbereich zur Umlenkung der Strömungsrichtung des Abgases ausgebildet.In a further detailed design, a deflection region for deflecting the flow direction of the exhaust gas is formed on an end face of the exhaust gas cooler.

Das Filterglied kann einfach und kostengünstig als Rohrteil mit darin festgelegtem Filtereinsatz ausgebildet sein. Der Filtereinsatz kann zum Beispiel durch Schweißen oder Löten in dem Rohrteil festgelegt sein.The filter element can be designed simply and inexpensively as a tube part with a filter insert fixed therein. The filter cartridge may be fixed by welding or brazing in the pipe member, for example.

Allgemein vorteilhaft ist für Betriebsarten wie zum Beispiel einer Kaltstartphase eine von Abgas durchströmbare Bypassleitung an dem Abgaskühler vorgesehen, wobei die Bypassleitung insbesondere stromabwärts des Filterglieds und stromaufwärts einer Mehrzahl der Strömungskanäle abzweigt. Hierdurch erfolgt jederzeit eine Filterung des Gasstroms, auch wenn das Abgas über die nicht oder nur wenig gekühlte Bypassleitung strömt.For operating modes such as, for example, a cold start phase, a bypass line through which exhaust gas can flow is provided on the exhaust gas cooler, wherein the bypass line branches off, in particular, downstream of the filter element and upstream of a plurality of the flow channels. As a result, a filtering of the gas flow takes place at any time, even if the exhaust gas flows over the bypass line which is not cooled or only slightly cooled.

Allgemein bevorzugt ist das Filterglied als nicht im Betrieb regenerierbarer Dauerfilter ausgebildet. Je nach Anforderungen kann das Filterglied dabei auf die gesamte Lebensdauer des Verbrennungsmotors ausgelegt sein oder auch als austauschbares Bauteil bzw. Verschleißteil.Generally preferred, the filter member is designed as non-regenerable in operation permanent filter. Depending on requirements, the filter member can be designed for the entire life of the engine or as an exchangeable component or wearing part.

In allgemein bevorzugter Ausführung ist der Abgaskühler zur Anordnung stromabwärts eines Partikelfilters ausgebildet. Dabei übernimmt der Partikelfilter die Aufgabe ein regenerierbaren Feinstaubfilters und das Filterglied hat vorrangig die Aufgabe eines Schutzfilters für größere Partikel, die zum Beispiel in einer Abbrandphase des Partikelfilters entstehen und einen nachfolgenden Turbolader gefährden können. Allgemein vorteilhaft ist ein erfindungsgemäßer Abgaskühler daher aus gleichem Grund zur Anordnung stromaufwärts eines Turboladers (Niederdruck-Abgasrückführung) ausgebildet.In a generally preferred embodiment, the exhaust gas cooler is designed to be arranged downstream of a particle filter. The particulate filter assumes the task of a regenerable particulate matter filter and the filter member has primarily the task of a protective filter for larger particles that arise, for example, in a combustion phase of the particulate filter and can endanger a subsequent turbocharger. For the same reason, an exhaust gas cooler according to the invention is generally designed to be arranged upstream of a turbocharger (low-pressure exhaust gas recirculation) for the same reason.

Weitere Vorteile und Merkmale der Erfindung ergeben sich aus den nachfolgenden Ausführungsbeispielen sowie den abhängigen Ansprüchen.Further advantages and features of the invention will become apparent from the following embodiments and the dependent claims.

Nachfolgend werden mehrere bevorzugte Ausführungsbeispiele eines Abgaskühlers beschrieben und anhand der anliegenden Zeichnungen näher erläutert.

Fig. 1
zeigt eine räumliche Darstellung eines erfindungsgemäßen Abgaskühlers.
Fig. 2
zeigt eine räumliche Ansicht des Abgaskühlers aus Fig. 1 ohne Anschlussbereich.
Fig. 3
zeigt eine Ausschnittvergrößerung des Abgaskühlers aus Fig. 2
Fig. 4
zeigt eine weitere Ausführungsform eines erfindungsgemäßen Abgaskühlers in räumlicher, aufgeschnittener Darstellung.
Fig. 5
zeigt eine Abwandlung des Abgaskühlers aus Fig. 4.
Hereinafter, several preferred embodiments of an exhaust gas cooler will be described and explained in more detail with reference to the accompanying drawings.
Fig. 1
shows a spatial representation of an exhaust gas cooler according to the invention.
Fig. 2
shows a spatial view of the exhaust gas cooler Fig. 1 without connection area.
Fig. 3
shows a section enlargement of the exhaust gas cooler Fig. 2
Fig. 4
shows a further embodiment of an exhaust gas cooler according to the invention in a spatial, cutaway view.
Fig. 5
shows a modification of the exhaust gas cooler Fig. 4 ,

Der Abgaskühler der Ausführungsform nach Fig. 1 bis Fig. 3 umfasst ein Gehäuse 1, das nach Art eines Wassermantels von einer Kühlflüssigkeit durchströmbar ist (Kühlmittelanschlüsse nicht dargestellt). Die Kühlflüssigkeit kann etwa an einen Motorkühlkreislauf angeschlossen sein oder auch an einen separaten Niedertemperatur-Kühlkreislauf.The exhaust gas cooler of the embodiment according to Fig. 1 to Fig. 3 comprises a housing 1, which is traversed by a cooling liquid in the manner of a water jacket (coolant connections not shown). The cooling liquid may be connected to an engine cooling circuit or else to a separate low-temperature cooling circuit.

In dem Gehäuse 1 sind ein Bündel aus Tauscherrohren 2 sowie ein rohrförmiges Filterglied 3 parallel zueinander angeordnet, die jeweils Strömungskanäle für Abgas eines Verbrennungsmotors ausbilden. In den vorliegenden Beispielen handelt es sich jeweils um einen Dieselmotor für ein Kraftfahrzeug, insbesondere einen Personenkraftwagen.In the housing 1, a bundle of exchanger tubes 2 and a tubular filter member 3 are arranged parallel to each other, each forming flow channels for exhaust gas of an internal combustion engine. In the present examples, each is a diesel engine for a motor vehicle, in particular a passenger car.

Das Filterglied 3 umfasst ein Rohrteil 3a sowie einen darin durch Verlötung oder Verschweißung festgelegten Filtereinsatz 3b, welcher etwa in den Zeichnungen Fig. 4 und Fig. 5 schematisch dargestellt ist. Sowohl die Tauscherrohre 2 als auch das Rohrteil 3a des Filterglieds 3 sind endseitig jeweils in demselben durchbrochenen Bodenteil 4 festgelegt, etwa durch Verschweißung.The filter element 3 comprises a tube part 3a and a filter insert 3b defined therein by soldering or welding, which is approximately in the drawings 4 and FIG. 5 is shown schematically. Both the exchanger tubes 2 and the tube part 3 a of the filter element 3 are each fixed in the same perforated bottom part 4, for example by welding.

Der Abgaskühler ist als U-Flow-Kühler ausgelegt und hat eine Eintrittsseite, auf der gemäß Fig. 1 ein Anschlussglied 5 mit einer Zuführung 5a und einer Abführung 5b für das Abgas auf dem eintrittsseitigen Bodenteil 4 aufgeschraubt ist.The exhaust gas cooler is designed as a U-flow cooler and has an inlet side, according to Fig. 1 a connection member 5 with a feed 5a and a Outlet 5b is screwed for the exhaust gas on the inlet-side bottom part 4.

An dem gegenüberliegenden Ende der Strömungskanäle ist ein Umlenkbereich 6 auf dem dortigen Bodenteil festgelegt. Das Abgas durchströmt den Abgaskühler somit zunächst in einer Hinrichtung durch das Filterglied, wird dann in dem Umlenkbereich 6 um 180° umgelenkt und durchströmt den Abgaskühler in der Rückrichtung durch die Tauscherrohre 2.At the opposite end of the flow channels, a deflection region 6 is fixed on the bottom part there. The exhaust gas thus flows through the exhaust gas cooler first in an execution through the filter member, is then deflected in the deflection region 6 by 180 ° and flows through the exhaust gas cooler in the return direction through the exchanger tubes. 2

Der Umlenkbereich 6 ist als hohle Kammer ausgebildet, in die zudem ein Bypasskanal 7 mündet. Hierdurch kann zum Beispiel in einer Kaltstartphase der Abgasstrom zunächst das Filterglied 3 durchströmen und dann ohne weitere Kühlung durch den Bypasskanal 7 abgeführt werden. Der überwiegende Teil der Abgaskühlung erfolgt durch das Bündel von Tauscherrohren 2, wobei eine geringe Wärmeabführung auch durch das kühlmittelumströmte Filterglied 3 gegeben ist.The deflection region 6 is formed as a hollow chamber, into which also a bypass channel 7 opens. As a result, for example, in a cold start phase, the exhaust gas flow first flows through the filter element 3 and then removed through the bypass channel 7 without further cooling. The majority of the exhaust gas cooling takes place through the bundle of exchanger tubes 2, wherein a low heat dissipation is also given by the coolant-flowed filter element 3.

Der Abgaskühler gemäß den vorliegenden Ausführungsbeispielen besteht überwiegend aus korrosionsresistentem Stahl. Je nach Abgastemperatur und Auslegung können zumindest einige Teile auch aus Aluminium oder Kunststoff (z.B. der Wassermantel 1) bestehen.The exhaust gas cooler according to the present embodiments consists predominantly of corrosion-resistant steel. Depending on the exhaust gas temperature and design, at least some parts may also be made of aluminum or plastic (e.g., the water jacket 1).

Der Abgaskühler ist in ein Gesamtsystem eingebunden, bei dem die Abgasrückführung als Niederdruck-Rückführung ausgelegt ist. In Strömungsrichtung ist dem Abgaskühler ein regenerierbarer Partikelfilter vorgeordnet und die Luftseite eines Abgas-Turboladers nachgeordnet. Die Beimischung des Abgases zu der Verbrennungsluft des Motors erfolgt hier also vor der Verdichtung durch den Turbolader.The exhaust gas cooler is integrated in an overall system in which the exhaust gas recirculation is designed as a low-pressure feedback. In the flow direction of the exhaust gas cooler upstream of a regenerable particulate filter and arranged downstream of the air side of an exhaust gas turbocharger. The admixture of the exhaust gas to the combustion air of the engine takes place here before the compression by the turbocharger.

Das Filterglied 3 ist als nicht regenerierbarer Dauerfilter ausgebildet, der für die gesamte Lebensdauer des Fahrzeugs ausgelegt ist. Eine Maschenweite des Filters ist entsprechend so gestaltet, dass nur Partikel einer Größe, die den Turbolader gefährden könnten, ausgefiltert werden.The filter member 3 is formed as a non-regenerable permanent filter, which is designed for the entire life of the vehicle. A mesh size of the filter is designed so that only particles of a size that could endanger the turbocharger are filtered out.

Bei dem Ausführungsbeispiel nach Fig. 4 sind zur weiteren Veranschaulichung die Richtungen des Abgasstroms durch Pfeile angedeutet. Neben einer anderen Anordnung der Tauscherrohre besteht der Unterschied zu dem ersten Ausführungsbeispiel darin, dass kein Bypasskanal vorgesehen ist.According to the embodiment Fig. 4 For further illustration, the directions of the exhaust gas flow are indicated by arrows. In addition to another arrangement of the exchanger tubes, the difference to the first embodiment is that no bypass channel is provided.

Die Abwandlung nach Fig. 5 entspricht bis auf die Anordnung der Tauscherrohre dem Beispiel aus Fig. 4. In Fig. 5 sind die beiden stirnseitigen Bodenteile 4 und der Hohlraum des Umlenkbereichs 6 besonders gut erkennbar, wobei zur besseren Übersicht nur eines der Tauscherrohre 3 dargestellt ist.The modification after Fig. 5 corresponds to the example except for the arrangement of the exchanger tubes Fig. 4 , In Fig. 5 are the two end-side bottom portions 4 and the cavity of the deflection 6 particularly clearly visible, with only one of the exchanger tubes 3 is shown for clarity.

Es versteht sich, dass die Merkmale der einzelnen Ausführungsbeispiele je nach Anforderungen sinnvoll miteinander kombiniert werden können.It is understood that the features of the individual embodiments can be usefully combined depending on the requirements.

Claims (11)

Abgaskühler für einen Verbrennungsmotor, umfassend
eine Mehrzahl von Abgas führenden Strömungskanälen (2, 3), wobei die Strömungskanäle (2, 3) innerhalb eines Gehäuses (1) angeordnet sind und mit einem Fluid zur Kühlung des Abgases in thermischem Austausch stehen,
dadurch gekennzeichnet,
dass zumindest ein Filterglied (3) zur Filterung von Partikeln aus dem Abgasstrom baulich in den Abgaskühler integriert ist.Exhaust gas cooler for an internal combustion engine, comprising
a plurality of exhaust gas carrying flow channels (2, 3), wherein the flow channels (2, 3) are arranged within a housing (1) and are in thermal exchange with a fluid for cooling the exhaust gas,
characterized,
that at least one filter element (3) for filtering particles from the exhaust gas flow is structurally integrated into the exhaust gas cooler. Abgaskühler nach Anspruch 1, dadurch gekennzeichnet, dass das Filterglied (3) innerhalb des Gehäuses (1) angeordnet ist, wobei insbesondere das Gehäuse (1) von dem Fluid durchströmbar ist.Exhaust cooler according to claim 1, characterized in that the filter member (3) within the housing (1) is arranged, wherein in particular the housing (1) can be flowed through by the fluid. Abgaskühler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Abgaskühler von dem Abgas zumindest jeweils einmal in einer Hinrichtung und in einer Rückrichtung durchströmbar ist, wobei das Filterglied (3) in zumindest einer von beiden, Hinrichtung oder Rückrichtung, vorgesehen ist.Exhaust cooler according to one of the preceding claims, characterized in that the exhaust gas cooler can be flowed through by the exhaust gas at least once in an execution and in a return direction, wherein the filter member (3) is provided in at least one of both, execution or return direction. Abgaskühler nach Anspruch 3, dadurch gekennzeichnet, dass ein insbesondere einziger Strömungskanal der Hinrichtung als ein das Filterglied (3) bildendes Rohrteil (3a) ausgebildet ist, wobei eine Mehrzahl von Strömungskanälen der Rückrichtung als Bündel von Tauscherrohren (2) ausgebildet ist.Exhaust gas cooler according to claim 3, characterized in that a particular single flow channel of the execution as a filter member (3) forming the tube part (3a) is formed, wherein a plurality of flow channels of the return direction is formed as a bundle of exchanger tubes (2). Abgaskühler nach Anspruch 4, dadurch gekennzeichnet, dass das Rohrteil (3a) und/oder das Bündel von Tauscherrohren (2) in endseitigen Bodenteilen (4) aufgenommen sind.Exhaust gas cooler according to claim 4, characterized in that the pipe part (3a) and / or the bundle of exchanger tubes (2) are received in end base parts (4). Abgaskühler nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, dass an einer Stirnseite des Abgaskühlers ein Umlenkbereich (6) zur Umlenkung der Strömungsrichtung des Abgases ausgebildet ist.Exhaust cooler according to one of claims 3 to 5, characterized in that on a front side of the exhaust gas cooler, a deflection region (6) for deflecting the flow direction of the exhaust gas is formed. Abgaskühler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Filterglied (3) als Rohrteil (3a) mit darin festgelegtem Filtereinsatz (3b) ausgebildet ist.Exhaust cooler according to one of the preceding claims, characterized in that the filter member (3) as a pipe part (3a) is formed therein with a filter insert (3b). Abgaskühler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine von Abgas durchströmbare Bypassleitung (7) vorgesehen ist, wobei die Bypassleitung (7) insbesondere stromabwärts des Filterglieds (3) und stromaufwärts einer Mehrzahl der Strömungskanäle (2) abzweigt.Exhaust gas cooler according to one of the preceding claims, characterized in that a bypass line (7) through which exhaust gas can flow is provided, the bypass line (7) branching off in particular downstream of the filter element (3) and upstream of a plurality of the flow channels (2). Abgaskühler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Filterglied (3) als nicht im Betrieb regenerierbarer Dauerfilter ausgebildet ist.Exhaust gas cooler according to one of the preceding claims, characterized in that the filter member (3) is designed as a non-regenerable during operation permanent filter. Abgaskühler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Abgaskühler zur Anordnung stromabwärts eines Partikelfilters ausgebildet ist.Exhaust cooler according to one of the preceding claims, characterized in that the exhaust gas cooler is designed for arrangement downstream of a particulate filter. Abgaskühler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Abgaskühler zur Anordnung stromaufwärts eines Turboladers ausgebildet ist.Exhaust cooler according to one of the preceding claims, characterized in that the exhaust gas cooler is designed for arrangement upstream of a turbocharger.
EP08291142A 2008-12-03 2008-12-03 Exhaust gas cooler with an integrated particulate filter for an internal combustion engine Not-in-force EP2194351B1 (en)

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EP08291142A EP2194351B1 (en) 2008-12-03 2008-12-03 Exhaust gas cooler with an integrated particulate filter for an internal combustion engine
AT08291142T ATE556284T1 (en) 2008-12-03 2008-12-03 EXHAUST GAS COOLER WITH INTEGRATED PARTICLE FILTER FOR AN COMBUSTION ENGINE
US12/591,669 US20100132346A1 (en) 2008-12-03 2009-11-27 Exhaust-gas cooler for an internal combustion engine

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ATE556284T1 (en) 2012-05-15
US20100132346A1 (en) 2010-06-03

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