EP1132609A2 - Heat exchanger in an EGR arrangement - Google Patents

Heat exchanger in an EGR arrangement Download PDF

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Publication number
EP1132609A2
EP1132609A2 EP01103422A EP01103422A EP1132609A2 EP 1132609 A2 EP1132609 A2 EP 1132609A2 EP 01103422 A EP01103422 A EP 01103422A EP 01103422 A EP01103422 A EP 01103422A EP 1132609 A2 EP1132609 A2 EP 1132609A2
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EP
European Patent Office
Prior art keywords
exhaust gas
heat exchanger
exhaust
gas heat
manifold
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
EP01103422A
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German (de)
French (fr)
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EP1132609B1 (en
EP1132609A3 (en
Inventor
Thomas Jantscheck
Roland STRÄHLE
Wolfgang Knecht
Thomas Eckert
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Modine Manufacturing Co
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Modine Manufacturing Co
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Publication date
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Publication of EP1132609A3 publication Critical patent/EP1132609A3/en
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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
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
    • F28D9/0037—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the conduits for the other heat-exchange medium also being formed by paired plates touching each other
    • 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
    • F02M26/22—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
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/71—Multi-way valves

Definitions

  • the invention relates to an exhaust gas heat exchanger in an exhaust gas recirculation arrangement for internal combustion engines with an exhaust manifold and an exhaust gas recirculation line and with an inlet and an Outflow channels and an exhaust valve having an actuator, for example on one side attached to the exhaust gas heat exchanger or forming a structural unit with the exhaust gas heat exchanger or only in close proximity to the exhaust gas heat exchanger, the exhaust valve one Part of the exhaust gas flow either through the exhaust gas heat exchanger into the exhaust gas recirculation line or leads directly into the exhaust gas recirculation line to the intake manifold of the internal combustion engine and the exhaust manifold Branches to the cylinder heads of the internal combustion engine and an outlet, for example to the exhaust gas turbocharger.
  • the object of the invention is to provide an inexpensive and space-saving arrangement of the Describe the exhaust gas heat exchanger for cooling the exhaust gas to be recycled, which in its Effectiveness is improved.
  • the exhaust gas heat exchanger has two connections Openings in the exhaust manifold is connected, between the one opening and the the exhaust valve is arranged on one side of the exhaust gas heat exchanger and the other side of the exhaust gas heat exchanger is connected to the other opening and at least one of the Openings in the backflow area of the exhaust gases before they exit, in the direction of flow of the exhaust gases seen, arranged.
  • the mentioned sides of the exhaust gas heat exchanger are preferably the opposite ends the same.
  • the exhaust valve equipped with a switching flap ensures that the valve is largely completely shut off the exhaust gas path through the heat exchanger so that the exhaust gases are not cooled, if that's not wanted.
  • the one opening with a connection to the inflow channel of the exhaust valve which is preferably the connection that is in the backflow area Exhaust gas is through which the uncooled exhaust gas to be recycled flows and that preferably the other opening in the exhaust manifold, which connects to the opposite Has side of the exhaust gas heat exchanger, is that through which to be cooled and returned Exhaust gas flows into the exhaust gas heat exchanger.
  • the opening mentioned can be in the manifold of the exhaust manifold e.g. B. to the turbocharger, the catalytic converter or another device that generates the back pressure are located. It should not be more than 1/2 of the total length of the exhaust manifold, preferably 1/3 of the total length, from the exit from it, because then the effect of the backlog is greatly reduced.
  • the exhaust gas heat exchanger is arranged so that it is only in the direction is flowable to the exhaust valve.
  • connection or assembly between the exhaust gas heat exchanger and exhaust valve which, however, in the Within the scope of this inventive teaching is not a mandatory requirement, the previously unpublished, from the applicant, patent application DE 198 41 927 The content of which is to be viewed in its entirety as well as disclosed here.
  • the exhaust valve is namely in close proximity to the Exhaust gas heat exchanger, however, is not directly connected to it, e.g. B. flanged to it.
  • the coolant of the internal combustion engine is preferably used as the coolant of the exhaust gas.
  • the internal structure of the exhaust gas heat exchanger is a so-called plate heat exchanger without a housing trained and corresponds to that from the previously unpublished German patent application DE 198 46 518.1, which also comes from the applicant and in its entirety as here disclosed should apply.
  • the internal structure is only preferred according to the above Patent application designed. It could also be a heat exchanger surrounded by a housing is.
  • Fig. 1 shows the arrangement of the exhaust gas heat exchanger based on a basic circuit diagram.
  • Fig. 2 shows a preferred variant of the arrangement of the exhaust gas heat exchanger on the exhaust manifold.
  • FIG. 3 shows a variant different from FIG. 2.
  • FIG. 4 is a side view similar to FIG. 2.
  • FIG. 5 is the top view of FIG. 4.
  • FIG. 6 is a side view of the exhaust gas heat exchanger without an exhaust valve.
  • FIG. 7 is the partial section AA from FIG. 6.
  • FIG. 8 is a view according to arrow B in FIG. 6.
  • the invention has been implemented in a diesel internal combustion engine 6.
  • the exhaust gas heat exchanger 1 is located on the exhaust manifold 2 of the row of cylinders.
  • the uncooled Exhaust gases flow to return via the return line 3 to the intake manifold S of the internal combustion engine 6 to get where they are mixed with the fresh air supplied by the exhaust gas turbocharger ATL and one repeated combustion in the cylinders of the internal combustion engine 6 are supplied.
  • the embodiment from Fig. 1 shows that the fresh air previously sent through the charge air cooler LLK to be cooled as needed.
  • connection 17 between the opposite Side of the exhaust gas heat exchanger 1 and the exhaust manifold 2 is in the area of the first Branch Z1 arranged. Through this connection 17 flows - in the corresponding position Switch flap 5 of the exhaust valve 4, the exhaust gas to be cooled in the exhaust gas heat exchanger 1 in order to the coolant of the internal combustion engine 6 is cooled and then via the return line 3 to be recycled as described.
  • Fig. 2 corresponds to the variant shown in Fig. 1, showing how the exhaust valve 4 is constructed is. It has an inflow channel 7 for uncooled exhaust gases flowing in via the connection 15.
  • the switching flap 5 is in a position in which the inflow channel 7 connected to the outflow channel 9 and the inflow channel 8 is closed.
  • the exhaust gas arrives into the return line 3 and back to the suction side S.
  • the inflow channels 7 and 8 are approximately open arranged in a line. They represent approximately the extension of the exhaust gas flow channels 26 within of the exhaust gas heat exchanger 1.
  • the outflow channel 9 is approximately perpendicular to the aforementioned ones Channels 7 and 8.
  • FIGS. 1 and 2 are preferred variants because of the effectiveness of the exhaust gas recirculation is improved without cooling.
  • the exhaust manifold (10) there is a bellows-like part 22, which serves to expand the material to compensate, because extremely high temperature fluctuations can be expected, which must be taken into account in the entire arrangement, in particular also in the execution of the exhaust valve 4.
  • the exhaust gas heat exchanger 1 only in the direction of Exhaust valve 4 flows through with the exhaust gas.
  • the total length L is in FIG Exhaust manifold 2 has been drawn.
  • the opening 14 in FIG. 3 or the opening 13 in FIG. 2 should preferably be no more than 1/3 of the total length L from the outlet 12 of the exhaust gases his. 2 and 3, both possible positions of the actuator 5 have been drawn.
  • the inflow channel 7 is closed, so that through the exhaust gas heat exchanger 1 flowing exhaust gas flow in through the inflow channel 8 and through the outflow channel 9 can get into the return line 3. 3, however, is the inflow channel 8 closed and the inflow channel 7 opened, so that the exhaust gas is accordingly cooled without to get into the return line 3.
  • the exhaust manifold 2 here also has five branches Z1 to Z5 arranged in series, which are each provided with a flange to the cylinder heads, not shown, of the internal combustion engine 6 to be connected. It consists of two deformed half shells that are in Longitudinal direction of the exhaust manifold 2 are connected, which is indicated by the thick line in Fig. 4 becomes. Furthermore, the exhaust manifold 2 also includes a manifold 23, the one Has outlet 12, which leads to the exhaust gas turbocharger ATL in the embodiment, which is more compact Construction of the internal combustion engine 6 is arranged directly at the outlet 12.
  • the exhaust gas heat exchanger 1 is very close to the exhaust manifold 2 and approximately parallel to it.
  • the connecting piece 11 leads to the opening 13, the is located in the manifold 23 and thus extremely close to the outlet 12 of the exhaust gases is arranged, whereby the backlog of exhaust gases that is formed is used effectively to keep uncooled
  • the return line 3 in this embodiment also has a flange 21 around a further line to fix.
  • the connecting piece 10 is with its flange 20 at the opening 14 between the first Z 1 and the second branch Z 2 to the cylinder heads, not shown, on one side attached.
  • the connecting piece 10 leads to the connection 17 of the exhaust gas heat exchanger 1.
  • the position of the opening 14 can, however, be chosen relatively freely. Another not The embodiment shown has the opening 14 approximately in the middle of the exhaust manifold 2 because a significantly smaller or shorter exhaust gas heat exchanger 2 can be used.
  • the exhaust gas heat exchanger 1 is on the exhaust manifold 2 by means of additional holders 18 and 19 been attached.
  • the exhaust gas heat exchanger 1 is a housing-free plate heat exchanger in which the exhaust gas with the Coolant liquid of the internal combustion engine 6 is cooled. As also shown in FIGS. 6, 7 and 8, has the exhaust gas heat exchanger 1 two connections 24 for the coolant. These can e.g. B. in projecting areas 28 over the edge of the heat exchanger plates 25. The heat exchanger plates 25 are deformed so that they can be stacked on or in one another and alternate flow channels 27 for the cooling liquid and 26 for the exhaust gas. 5, which can be viewed as a view from above on FIG. 4, additionally shows one on the exhaust valve 4 arranged actuator 30 which is connected to a shaft 31, which in turn the actuator 5, i.e. the switching flap, is actuated. The details of this belong to the state of the Technology and need not be described in detail here.
  • the heat exchanger plates 25 can be made of stainless steel. They become one by soldering compact and tightly sealed to the outside. In the channels 26 are relative smooth slats 29, which swirl the exhaust gases and thus improve heat exchange worry, but without causing problems with the deposition of residues of the exhaust gas, or to lead to the sooting of the channels 26.
  • the heat exchanger plates 25 have a bead which can be referred to as a circumferential shape 32 on. They lie on one another with their circumferential features 32 and thereby form the flow channels 27 for the coolant.
  • 7 is the path through the exhaust gas heat exchanger 1, which the coolant describes has been shown by arrows.
  • the exhaust gas flows in the direction of arrow B through the channels 26 onto the one not shown Exhaust valve 4 and on from there, as already described. Describes further details the aforementioned German patent application No. 198 46 518.1

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Exhaust Silencers (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The exhaust gas heat exchanger(1) is connected to two ports located in the exhaust manifold and having two connections(15,17). The exhaust valve is located between one port and one side of the exhaust gas heat exchanger, with the other side of the heat exchanger in communication with the other port. At least one of the ports is located in the back pressure area of the exhaust gases in front of their outlet when viewed in the direction of exhaust gas flow. Exhaust gas flows through the heat exchanger in the direction of the exhaust valve.

Description

Die Erfindung betrifft einen Abgaswärmetauscher in einer Abgasrückführungsanordnung für Brennkraftmaschinen mit einer Abgassammelleiste und einer Abgasrückführleitung und mit einem Ein-und Ausströmkanäle und ein Stellglied aufweisenden Abgasventil, beispielsweise an einer Seite des Abgaswärmetauschers befestigt oder mit dem Abgaswärmetauscher eine Baueinheit bildend oder nur in räumlicher Nähe zum Abgaswärmetauscher angeordnet, wobei das Abgasventil einen Teil des Abgasstromes entweder durch den Abgaswärmetauscher in die Abgasrückführleitung oder direkt in die Abgasrückführleitung zum Saugrohr der Brennkraftmaschine leitet und die Abgassammelleiste Abzweige an die Zylinderköpfe der Brennkraftmaschine und einen Austritt, beispielsweise zum Abgasturbolader, aufweist.The invention relates to an exhaust gas heat exchanger in an exhaust gas recirculation arrangement for internal combustion engines with an exhaust manifold and an exhaust gas recirculation line and with an inlet and an Outflow channels and an exhaust valve having an actuator, for example on one side attached to the exhaust gas heat exchanger or forming a structural unit with the exhaust gas heat exchanger or only in close proximity to the exhaust gas heat exchanger, the exhaust valve one Part of the exhaust gas flow either through the exhaust gas heat exchanger into the exhaust gas recirculation line or leads directly into the exhaust gas recirculation line to the intake manifold of the internal combustion engine and the exhaust manifold Branches to the cylinder heads of the internal combustion engine and an outlet, for example to the exhaust gas turbocharger.

Ein Abgaswärmetauscher, der eine Baueinheit mit dem Abgasventil bildet, wurde in der bisher nicht veröffentlichten Patentanmeldung DE 198 41 927 beschrieben. Es hat sich erwiesen, daß dieser Abgaswärmetauscher mit seinem Abgasventil in Phasen, in denen keine Abgaskühlung gewünscht ist, trotzdem einen - wenn auch geringen - Abgasstrom durch den Abgaskühler aufweist. Der Grund dafür besteht offensichtlich darin, daß die durch den Ventilkanal hindurchgehende Schwenkachse des Klappenventils in der Offenstellung zu hohen Strömungswiderstand aufweist, weshalb ein zu großer Anteil des Abgases durch den Abgaskühler geleitet wird. Die Schwenkachse verkleinert auch den Strömungsquerschnitt in der Offenstellung. Insgesamt wird deshalb die Leistungsfähigkeit der Abgasrückführungsanordnung beeinträchtigt. Die Art und Weise des Einbaus bzw. die Integration des Abgaswärmetauschers in die Abgasrückführungsanordnung wurde dort nicht beschrieben. Aus DE 198 10 726 ist eine wassergekühlte Abgassammelleiste bekannt, die in ihrem Inneren Kanäle für Kühlwasser aufweist, die mit einem Luftspaltraum um die zentrale Abgasleitung angeordnet sind, wobei die Abgasleitung direkt an jeden einzelnen Zylinderkopf angeflanscht ist. Solche Lösungen sind vorzugsweise für größere Kraftfahrzeuge gedacht. Die Konstruktion der Abgassammelleiste ist wegen der Integration des Abgaskühlers relativ aufwendig und weist insbesondere für die Anwendung bei PKW's ein zu hohes Gewicht auf. Die Abgasrückführung und Kühlung zum Zwecke der Rückführung wurde nicht angesprochen.An exhaust gas heat exchanger, which forms a structural unit with the exhaust valve, has not previously been used in the published patent application DE 198 41 927. It has been shown that this Exhaust gas heat exchanger with its exhaust valve in phases in which no exhaust gas cooling is desired is, nevertheless, has an - albeit small - exhaust gas flow through the exhaust gas cooler. The reason this obviously means that the pivot axis passing through the valve channel of the flap valve in the open position has too high flow resistance, which is why too large proportion of the exhaust gas is passed through the exhaust gas cooler. The swivel axis is reduced also the flow cross section in the open position. Overall, therefore, the performance the exhaust gas recirculation arrangement impaired. The way of installation or integration of the exhaust gas heat exchanger in the exhaust gas recirculation arrangement was not described there. From DE 198 10 726 a water-cooled exhaust manifold is known, the channels in its interior for cooling water, which is arranged with an air gap space around the central exhaust pipe are, with the exhaust pipe flanged directly to each individual cylinder head. Such solutions are primarily intended for larger motor vehicles. The construction of the exhaust manifold is relatively complex because of the integration of the exhaust gas cooler and has particular for the Use on cars is too heavy. Exhaust gas recirculation and cooling for the purpose the repatriation was not addressed.

Die Aufgabe der Erfindung besteht darin, eine kostengünstige und raumsparende Anordnung des Abgaswärmetauschers zur Kühlung des zurückzuführenden Abgases zu beschreiben, die in ihrer Wirksamkeit verbessert ist.The object of the invention is to provide an inexpensive and space-saving arrangement of the Describe the exhaust gas heat exchanger for cooling the exhaust gas to be recycled, which in its Effectiveness is improved.

Erfindungsgemäß ist vorgesehen, daß der Abgaswärmetauscher an zwei Anschlüsse aufweisende Öffnungen in der Abgassammelleiste angeschlossen ist, wobei zwischen der einen Öffnung und der einen Seite des Abgaswärmetauschers das Abgasventil angeordnet ist und wobei die andere Seite des Abgaswärmetauschers mit der anderen Öffnung in Verbindung ist und mindestens eine der Öffnungen im Rückstaubereich der Abgase vor deren Austritt, in Strömungsrichtung der Abgase gesehen, angeordnet ist.According to the invention it is provided that the exhaust gas heat exchanger has two connections Openings in the exhaust manifold is connected, between the one opening and the the exhaust valve is arranged on one side of the exhaust gas heat exchanger and the other side of the exhaust gas heat exchanger is connected to the other opening and at least one of the Openings in the backflow area of the exhaust gases before they exit, in the direction of flow of the exhaust gases seen, arranged.

Die erwähnten Seiten des Abgaswärmetauschers sind vorzugsweise die gegenüberliegenden Enden desselben.The mentioned sides of the exhaust gas heat exchanger are preferably the opposite ends the same.

Die Montage des Abgaswärmetauschers in unmittelbarer Nähe der Abgassammelleiste führt zu extrem kurzen Leitungswegen und damit zu kompakten Bauweisen. Deshalb ist im ungekühlten Betrieb der Brennkraftmaschine, d. h. in der Kaltstartphase bei relativ niedrigen Abgastemperaturen, eine hohe Abgasmenge ungekühlt zum Saugrohr der Brennkraftmaschine rückführbar. Der Abgaskatalysator wird früher wirksam und die Kaltstartphase wird deshalb verkürzt. Ferner bietet die direkte Ankopplung des Abgaswärmetauschers an die Abgassammelleiste günstige konstruktive Möglichkeiten, um mit geringen Änderungen eine gesamte Motoren-Baureihe mit Abgaswärmetauschern auszustatten.The installation of the exhaust gas heat exchanger in the immediate vicinity of the exhaust manifold leads to extremely short cable routes and thus compact designs. That is why in the uncooled Operation of the internal combustion engine, d. H. in the cold start phase at relatively low exhaust gas temperatures, a large amount of exhaust gas can be returned uncooled to the intake manifold of the internal combustion engine. The The catalytic converter takes effect earlier and the cold start phase is therefore shortened. Also offers the direct coupling of the exhaust gas heat exchanger to the exhaust manifold cheap constructive Possibilities to make an entire engine series with exhaust gas heat exchangers with minor changes equip.

Das mit einer Schaltklappe ausgerüstete Abgasventil sorgt für die weitestgehend vollständige Absperrung des Abgasweges durch den Wärmetauscher, so daß die Abgase nicht gekühlt werden, wenn das nicht gewünscht ist.The exhaust valve equipped with a switching flap ensures that the valve is largely completely shut off the exhaust gas path through the heat exchanger so that the exhaust gases are not cooled, if that's not wanted.

Gemäß Anspruch 2 ist vorgesehen, daß die eine Öffnung mit dem einen Anschluß zum Einströmkanal des Abgasventils geht, der vorzugsweise derjenige Anschluß ist, der im Rückstaubereich der Abgase liegt, durch den das ungekühlte, zurückzuführende Abgas hindurchströmt und daß vorzugsweise die andere Öffnung in der Abgassammelleiste, die den Anschluß zur gegenüberliegenden Seite des Abgaswärmetauschers aufweist, jene ist, durch die das zu kühlende und zurückzuführende Abgas in den Abgaswärmetauscher strömt.According to claim 2 it is provided that the one opening with a connection to the inflow channel of the exhaust valve, which is preferably the connection that is in the backflow area Exhaust gas is through which the uncooled exhaust gas to be recycled flows and that preferably the other opening in the exhaust manifold, which connects to the opposite Has side of the exhaust gas heat exchanger, is that through which to be cooled and returned Exhaust gas flows into the exhaust gas heat exchanger.

Diese Maßnahmen werden als sehr wirksam angesehen, weil der Rückstau der Abgase zu hohen Rückführmengen des Abgases und zum schnellen Anspringen der Regelung der Abgasrückführung führt. Vorzugsweise kann sich die erwähnte Öffnung im Anschlußkrümmer der Abgassammelleiste z. B. zum Turbolader, zum Abgaskatalysator oder einer anderen den Rückstau erzeugenden Einrichtung befinden. Sie sollte nicht weiter als 1/2 der Gesamtlänge der Abgassammelleiste, vorzugsweise 1/3 der Gesamtlänge, vom Austritt aus derselben entfernt sein, weil dann die Wirkung des Rückstaus stark nachläßt.These measures are considered to be very effective because the backlog of exhaust gases is too high Return quantities of the exhaust gas and for quickly starting the control of the exhaust gas recirculation leads. Preferably, the opening mentioned can be in the manifold of the exhaust manifold e.g. B. to the turbocharger, the catalytic converter or another device that generates the back pressure are located. It should not be more than 1/2 of the total length of the exhaust manifold, preferably 1/3 of the total length, from the exit from it, because then the effect of the backlog is greatly reduced.

Gemäß Anspruch 3 ist der Abgaswärmetauscher so angeordnet, daß er ausschließlich in Richtung auf das Abgasventil durchströmbar ist.According to claim 3, the exhaust gas heat exchanger is arranged so that it is only in the direction is flowable to the exhaust valve.

Die zusätzliche Befestigung des Abgaswärmetauschers - falls erforderlich - erfolgt mittels kurzer Halter, direkt an der Abgassammelleiste.The additional attachment of the exhaust gas heat exchanger - if necessary - is carried out using a short one Bracket, directly on the exhaust manifold.

Die Verbindung oder die Baueinheit zwischen Abgaswärmetauscher und Abgasventil, die jedoch im Rahmen dieser erfinderischen Lehre keine zwingende Bedingung ist, kann aus der bisher unveröffentlichten, von der Anmelderin stammenden, Patentanmeldung DE 198 41 927 entnommen werden , deren Inhalt im gesamten Umfang als auch an dieser Stelle offenbart angesehen werden soll. Gemäß einer Ausführungsform befindet sich das Abgasventil nämlich zwar in räumlicher Nähe zum Abgaswärmetauscher, ist jedoch nicht direkt damit verbunden, z. B. daran angeflanscht.The connection or assembly between the exhaust gas heat exchanger and exhaust valve, which, however, in the Within the scope of this inventive teaching is not a mandatory requirement, the previously unpublished, from the applicant, patent application DE 198 41 927 The content of which is to be viewed in its entirety as well as disclosed here. According to one embodiment, the exhaust valve is namely in close proximity to the Exhaust gas heat exchanger, however, is not directly connected to it, e.g. B. flanged to it.

Als Kühlmittel des Abgases wird vorzugsweise die Kühlflüssigkeit der Brennkraftmaschine verwendet. Der innere Aufbau des Abgaswärmetauschers ist als sogenannter gehäuseloser Plattenwärmetauscher ausgebildet und entspricht dem aus der bisher unveröffentlichten deutschen Patentanmeldung DE 198 46 518.1, die ebenfalls von der Anmelderin stammt und in vollem Umfang als hier offenbart gelten soll. Auch der innere Aufbau ist jedoch nur vorzugsweise gemäß der genannten Patentanmeldung gestaltet. Es könnte auch ein Wärmetauscher sein, der von einem Gehäuse umgeben ist. The coolant of the internal combustion engine is preferably used as the coolant of the exhaust gas. The internal structure of the exhaust gas heat exchanger is a so-called plate heat exchanger without a housing trained and corresponds to that from the previously unpublished German patent application DE 198 46 518.1, which also comes from the applicant and in its entirety as here disclosed should apply. However, the internal structure is only preferred according to the above Patent application designed. It could also be a heat exchanger surrounded by a housing is.

Die Stellung des Stellglieds (Schaltklappe) des Abgasventils erfolgt im Rahmen der Steuerung der Brennkraftmaschine mittels bekannter Regelungstechnik unter Einbeziehung der Abgastemperatur. Weitere Merkmale sind in den Patentansprüchen enthalten. Ferner gehen Merkmale und Wirkungen aus der nachfolgenden Beschreibung von Ausführungsbeispielen hervor.The position of the actuator (switching flap) of the exhaust valve takes place within the control of the Internal combustion engine using known control technology, including the exhaust gas temperature. Further features are contained in the claims. Features and effects also go from the following description of exemplary embodiments.

Fig. 1 zeigt die Anordnung des Abgaswärmetauschers anhand eines prinzipiellen Schaltbildes.Fig. 1 shows the arrangement of the exhaust gas heat exchanger based on a basic circuit diagram.

Fig. 2 zeigt eine bevorzugte Variante der Anordnung des Abgaswärmetauschers an der Abgassammelleiste.Fig. 2 shows a preferred variant of the arrangement of the exhaust gas heat exchanger on the exhaust manifold.

Fig. 3 zeigt eine von Fig. 2 verschiedene Variante.FIG. 3 shows a variant different from FIG. 2.

Fig. 4 ist eine Seitenansicht ähnlich Fig. 2.FIG. 4 is a side view similar to FIG. 2.

Fig. 5 ist die Draufsicht auf Fig. 4.FIG. 5 is the top view of FIG. 4.

Fig. 6 ist eine Seitenansicht auf den Abgaswärmetauscher ohne Abgasventil.6 is a side view of the exhaust gas heat exchanger without an exhaust valve.

Fig. 7 ist der Teilschnitt A - A aus Fig. 6.FIG. 7 is the partial section AA from FIG. 6.

Fig. 8 ist eine Ansicht gemäß Pfeil B aus Fig. 6.8 is a view according to arrow B in FIG. 6.

Im Ausführungsbeispiel ist die Erfindung bei einer Diesel-Brennkraftmaschine 6 umgesetzt worden. Wie aus Fig. 1 zu erkennen ist, befindet sich der Abgaswärmetauscher 1 an der Abgassammelleiste 2 der Zylinderreihe. Am Abgasventil 4, das am Abgaswärmetauscher 1 befestigt ist, befindet sich der eine Anschluß 15 an die Abgassammelleiste 2. Durch diesen Anschluß können die ungekühlten Abgase strömen, um über die Rückführleitung 3 zurück zum Saugrohr S der Brennkraftmaschine 6 zu gelangen, wo sie mit der vom Abgasturbolader ATL gelieferten Frischluft gemischt und einer nochmaligen Verbrennung in den Zylindern der Brennkraftmaschine 6 zugeführt werden. Das Ausführungsbeispiel aus Fig. 1 zeigt, daß die Frischluft zuvor durch den Ladeluftkühler LLK geschickt wird, um je nach Bedarf gekühlt zu werden. Der andere Anschluß 17 zwischen der gegenüberliegenden Seite des Abgaswärmetauschers 1 und der Abgassammelleiste 2 ist im Bereich des ersten Abzweiges Z1 angeordnet. Durch diesen Anschluß 17 strömt - bei der entsprechenden Stellung der Schaltklappe 5 des Abgasventils 4 das zu kühlende Abgas in den Abgaswärmetauscher 1, um mittels der Kühlflüssigkeit der Brennkraftmaschine 6 gekühlt und anschließend über die Rückführleitung 3, wie beschrieben, zurückgeführt zu werden.In the exemplary embodiment, the invention has been implemented in a diesel internal combustion engine 6. As can be seen from Fig. 1, the exhaust gas heat exchanger 1 is located on the exhaust manifold 2 of the row of cylinders. On the exhaust valve 4, which is attached to the exhaust gas heat exchanger 1, is located one connection 15 to the exhaust manifold 2. Through this connection, the uncooled Exhaust gases flow to return via the return line 3 to the intake manifold S of the internal combustion engine 6 to get where they are mixed with the fresh air supplied by the exhaust gas turbocharger ATL and one repeated combustion in the cylinders of the internal combustion engine 6 are supplied. The embodiment from Fig. 1 shows that the fresh air previously sent through the charge air cooler LLK to be cooled as needed. The other connection 17 between the opposite Side of the exhaust gas heat exchanger 1 and the exhaust manifold 2 is in the area of the first Branch Z1 arranged. Through this connection 17 flows - in the corresponding position Switch flap 5 of the exhaust valve 4, the exhaust gas to be cooled in the exhaust gas heat exchanger 1 in order to the coolant of the internal combustion engine 6 is cooled and then via the return line 3 to be recycled as described.

Die Fig. 2 entspricht der in Fig. 1 gezeigten Variante, wobei sie zeigt, wie das Abgasventil 4 aufgebaut ist. Es besitzt einen Einströmkanal 7 für über den Anschluß 15 einströmende ungekühlte Abgase. In diesem Fall befindet sich die Schaltklappe 5 in einer Stellung, in der der Einströmkanal 7 mit dem Ausströmkanal 9 verbunden und der Einströmkanal 8 geschlossen ist. Das Abgas gelangt in die Rückführleitung 3 und zurück zur Saugseite S. Die Einströmkanäle 7 und 8 sind etwa auf einer Linie angeordnet. Sie stellen etwa die Verlängerung der Abgasströmungskanäle 26 innerhalb des Abgaswärmetauschers 1 dar. Der Ausströmkanal 9 ist etwa senkrecht zu den zuvor erwähnten Kanälen 7 und 8. Die Fig. 1 und 2 sind bevorzugte Varianten, weil die Wirksamkeit der Abgasrückführung ohne Kühlung verbessert ist. Es ist jedoch zweifellos auch möglich, eine Ausführung zu wählen, wie sie in der Fig. 3 dargestellt worden ist. Diese kann zur Anwendung kommen, falls die baulichen Restriktionen die Anwendung der zuvor beschriebenen Variante nicht zulassen. Beide Varianten gewährleisten, daß kein Abgas durch den Abgaswärmetauscher 1 strömt, wenn die Kühlung nicht erwünscht ist und sind deshalb wirksamer als die DE 198 41 927 aus dem Stand der Technik. In der Fig. 3 ist zu sehen, daß das Abgasventil 4 auf der gegenüberliegenden Seite des Abgaswärmetauschers 1 angeordnet worden ist. An dem Einströmkanal 7 des Abgasventils 4 ist hier der Anschluß 15 angeordnet worden, der mit dem Abgaskrümmer 10 zur Abgassammelleiste 2 führt. Die Öffnung 13 in der Abgassammelleiste 2 befindet sich etwa im Bereich des ersten Abzweiges Z1. An diese Öffnung 13 ist der Abgaskrümmer 10 angeflanscht oder anderweitig angeschlossen. Im Abgaskrümmer (10) befindet sich ein balgähnliches Teil 22, das dazu dient, die Werkstoffausdehnung zu kompensieren, denn es ist mit extrem hohen Temperaturschwankungen zu rechnen, die in der gesamten Anordnung zu berücksichtigen sind, insbesondere auch bei der Ausführung des Abgasventils 4. Wie in der Ausführung gemäß den Fig. 1 und 2, wird auch in Fig.3, in der entsprechenden Stellung der Schaltklappe 5, der Abgaswärmetauscher 1 nur in Richtung auf das Abgasventil 4 mit dem Abgas durchströmt. Darüber hinaus ist in der Fig. 3 die Gesamtlänge L der Abgassammelleiste 2 eingezeichnet worden. Die Öffnung 14 in Fig 3 bzw. die Öffnung 13 in Fig. 2 soll vorzugsweise nicht weiter als 1/3 der Gesamtlänge L von dem Austritt 12 der Abgase entfernt sein. In den Fig. 2 und 3 sind beide möglichen Stellungen des Stellglieds 5 eingezeichnet worden. In der aktuellen Stellung in Fig. 2 ist der Einströmkanal 7 geschlossen, so daß das durch den Abgaswärmetauscher 1 strömende Abgas über den Einströmkanal 8 einströmen und über den Ausströmkanal 9 in die Rückführleitung 3 gelangen kann. In der Fig. 3 hingegen, ist der Einströmkanal 8 geschlossen und der Einströmkanal 7 geöffnet, so daß dementsprechend das Abgas ohne gekühlt zu werden in die Rückführleitung 3 gelangt.Fig. 2 corresponds to the variant shown in Fig. 1, showing how the exhaust valve 4 is constructed is. It has an inflow channel 7 for uncooled exhaust gases flowing in via the connection 15. In this case, the switching flap 5 is in a position in which the inflow channel 7 connected to the outflow channel 9 and the inflow channel 8 is closed. The exhaust gas arrives into the return line 3 and back to the suction side S. The inflow channels 7 and 8 are approximately open arranged in a line. They represent approximately the extension of the exhaust gas flow channels 26 within of the exhaust gas heat exchanger 1. The outflow channel 9 is approximately perpendicular to the aforementioned ones Channels 7 and 8. FIGS. 1 and 2 are preferred variants because of the effectiveness of the exhaust gas recirculation is improved without cooling. However, it is undoubtedly also possible to have an execution choose as it has been shown in Fig. 3. This can be used if the structural restrictions do not allow the use of the previously described variant. Both Variants ensure that no exhaust gas flows through the exhaust gas heat exchanger 1 when the cooling is not desired and are therefore more effective than DE 198 41 927 from the prior art Technology. In Fig. 3 it can be seen that the exhaust valve 4 on the opposite side of the Exhaust gas heat exchanger 1 has been arranged. At the inflow channel 7 of the exhaust valve 4 here the connection 15 has been arranged, the exhaust manifold 10 to the exhaust manifold 2nd leads. The opening 13 in the exhaust manifold 2 is located approximately in the area of the first branch Z1. The exhaust manifold 10 is flanged or connected to this opening 13. In the exhaust manifold (10) there is a bellows-like part 22, which serves to expand the material to compensate, because extremely high temperature fluctuations can be expected, which must be taken into account in the entire arrangement, in particular also in the execution of the exhaust valve 4. As in the embodiment according to FIGS. 1 and 2, is also in Fig.3, in the corresponding position of the switching flap 5, the exhaust gas heat exchanger 1 only in the direction of Exhaust valve 4 flows through with the exhaust gas. In addition, the total length L is in FIG Exhaust manifold 2 has been drawn. The opening 14 in FIG. 3 or the opening 13 in FIG. 2 should preferably be no more than 1/3 of the total length L from the outlet 12 of the exhaust gases his. 2 and 3, both possible positions of the actuator 5 have been drawn. In the current position in Fig. 2, the inflow channel 7 is closed, so that through the exhaust gas heat exchanger 1 flowing exhaust gas flow in through the inflow channel 8 and through the outflow channel 9 can get into the return line 3. 3, however, is the inflow channel 8 closed and the inflow channel 7 opened, so that the exhaust gas is accordingly cooled without to get into the return line 3.

Während die zuvor beschriebenen Figuren mehr abstrakter Art sind, zeigen die Fig. 4 bis 8 eine praktische Ausführung der Erfindung, auf die nachfolgend Bezug genommen wird.While the figures described above are more abstract in nature, Figures 4 through 8 show one Practical embodiment of the invention, to which reference is made below.

Die Abgassammelleiste 2 weist hier ebenfalls fünf in Reihe angeordnete Abzweige Z1 bis Z5 auf, die jeweils mit einem Flansch versehen sind, um an die nicht gezeigten Zylinderköpfe der Brennkraftmaschine 6 angeschlossen zu werden. Sie besteht aus zwei verformten Halbschalen, die in Längsrichtung der Abgassammelleiste 2 verbunden sind, was durch die dicke Linie in Fig. 4 angezeigt wird. Ferner umfaßt die Abgassammelleiste 2 auch einen Anschlußkrümmer 23, der einen Austritt 12 besitzt, der im Ausführungsbeispiel zum Abgasturbolader ATL führt, der bei kompakter Bauweise der Brennkraftmaschine 6 unmittelbar am Austritt 12 angeordnet ist. In der Fig. 4 wurde die Strömung der Abgase durch Pfeile verdeutlicht, wobei die gestrichelten Pfeile den Teilstrom der Abgase zeigen sollen, der zurückgeführt und bei Bedarf gekühlt wird und die Pfeile mit durchgezogener Linienführung zeigen den Hauptstrom der Abgase zum Abgasturbolader ATL. Der Abgaswärmetauscher 1 ist sehr nahe zur Abgassammelleiste 2 und etwa parallel dazu angeordnet. Dazu dienen die kurzen Anschlußstutzen 10 und 11. Der Anschlußstutzen 11 führt zur Öffnung 13, die sich im Anschlußkrümmer 23 befindet und damit außerordentlich nahe am Austritt 12 der Abgase angeordnet ist, wodurch der sich bildende Rückstau der Abgase wirksam benutzt wird, um ungekühlte Abgase über das Abgasventil 4 in die Rückführleitung 3 zu befördern. Die Rückführleitung 3 besitzt in diesem Ausführungsbeispiel ebenfalls einen Flansch 21, um eine weiterführende Leitung zu befestigen. Der Anschlußstutzen 10 ist mit seinem Flansch 20 an der Öffnung 14 zwischen dem ersten Z 1 und dem zweiten Abzweig Z 2 zu den nicht gezeigten Zylinderköpfen auf einer Seite befestigt. Auf der anderen Seite führt der Anschlußstutzen 10 zum Anschluß 17 des Abgaswärmetauschers 1. Die Position der Öffnung 14 kann jedoch relativ frei gewählt werden. Ein anderes nicht gezeigtes Ausführungsbeispiel hat die Öffnung 14 etwa in der Mitte der Abgassammelleiste 2, weil ein wesentlich kleinerer bzw. kürzerer Abgaswärmetauscher 2 eingesetzt werden kann.The exhaust manifold 2 here also has five branches Z1 to Z5 arranged in series, which are each provided with a flange to the cylinder heads, not shown, of the internal combustion engine 6 to be connected. It consists of two deformed half shells that are in Longitudinal direction of the exhaust manifold 2 are connected, which is indicated by the thick line in Fig. 4 becomes. Furthermore, the exhaust manifold 2 also includes a manifold 23, the one Has outlet 12, which leads to the exhaust gas turbocharger ATL in the embodiment, which is more compact Construction of the internal combustion engine 6 is arranged directly at the outlet 12. 4 was the flow of the exhaust gases is illustrated by arrows, the dashed arrows representing the partial flow of Exhaust gases should show, which is returned and cooled if necessary and the arrows with solid Lines show the main flow of the exhaust gases to the turbocharger ATL. The exhaust gas heat exchanger 1 is very close to the exhaust manifold 2 and approximately parallel to it. To serve the short connecting piece 10 and 11. The connecting piece 11 leads to the opening 13, the is located in the manifold 23 and thus extremely close to the outlet 12 of the exhaust gases is arranged, whereby the backlog of exhaust gases that is formed is used effectively to keep uncooled To convey exhaust gases via the exhaust valve 4 into the return line 3. The return line 3 in this embodiment also has a flange 21 around a further line to fix. The connecting piece 10 is with its flange 20 at the opening 14 between the first Z 1 and the second branch Z 2 to the cylinder heads, not shown, on one side attached. On the other hand, the connecting piece 10 leads to the connection 17 of the exhaust gas heat exchanger 1. The position of the opening 14 can, however, be chosen relatively freely. Another not The embodiment shown has the opening 14 approximately in the middle of the exhaust manifold 2 because a significantly smaller or shorter exhaust gas heat exchanger 2 can be used.

Der Abgaswärmetauscher 1 ist mittels zusätzlicher Halter 18 und 19 an der Abgassammelleiste 2 befestigt worden.The exhaust gas heat exchanger 1 is on the exhaust manifold 2 by means of additional holders 18 and 19 been attached.

Der Abgaswärmetauscher 1 ist ein gehäuseloser Plattenwärmetauscher, in dem das Abgas mit der Kühlflüssigleit der Brennkraftmaschine 6 gekühlt wird. Wie auch die Fig. 6, 7 und 8 zeigen, besitzt der Abgaswärmetauscher 1 zwei Anschlüsse 24 für die Kühlflüssigkeit. Diese können z. B. in über den Rand der Wärmetauscherplatten 25 kragenden Bereichen 28 angeordnet sein. Die Wärmetauscherplatten 25 sind so verformt, daß sie auf - oder ineinander gestapelt werden können und dabei sich abwechselnde Strömungskanäle 27 für die Kühlflüssigkeit und 26 für das Abgas ausbilden. Die Fig. 5, die als Ansicht von oben auf Fig.4 angesehen werden kann, zeigt zusätzlich einen am Abgasventil 4 angeordneten Stellantrieb 30, der mit einer Welle 31 verbunden ist, die wiederum das Stellglied 5, also die Schaltklappe, betätigt. Die Einzelheiten hierzu gehören zum Stand der Technik und müssen hier nicht detailliert beschrieben werden.The exhaust gas heat exchanger 1 is a housing-free plate heat exchanger in which the exhaust gas with the Coolant liquid of the internal combustion engine 6 is cooled. As also shown in FIGS. 6, 7 and 8, has the exhaust gas heat exchanger 1 two connections 24 for the coolant. These can e.g. B. in projecting areas 28 over the edge of the heat exchanger plates 25. The heat exchanger plates 25 are deformed so that they can be stacked on or in one another and alternate flow channels 27 for the cooling liquid and 26 for the exhaust gas. 5, which can be viewed as a view from above on FIG. 4, additionally shows one on the exhaust valve 4 arranged actuator 30 which is connected to a shaft 31, which in turn the actuator 5, i.e. the switching flap, is actuated. The details of this belong to the state of the Technology and need not be described in detail here.

Die Wärmetauscherplatten 25 können aus Edelstahl bestehen. Sie werden mittels Löten zu einem kompakten und nach außen dichten Körper verbunden. In den Kanälen 26 befinden sich relativ glatte Lamellen 29, die für Verwirbelung der Abgase und damit für verbesserten Wärmeaustausch sorgen, ohne jedoch Probleme hinsichtlich der Ablagerung von Rückständen des Abgases zu machen, bzw. zur Versottung der Kanäle 26 zu führen.The heat exchanger plates 25 can be made of stainless steel. They become one by soldering compact and tightly sealed to the outside. In the channels 26 are relative smooth slats 29, which swirl the exhaust gases and thus improve heat exchange worry, but without causing problems with the deposition of residues of the exhaust gas, or to lead to the sooting of the channels 26.

Die Wärmetauscherplatten 25 weisen eine als umlaufende Ausprägung 32 zu bezeichnende Sicke auf. Sie liegen mit ihren umlaufenden Ausprägungen 32 aufeinander und bilden dadurch die Strömungskanäle 27 für die Kühlflüssigkeit. In der Fig.7 ist der Weg durch den Abgaswärmetauscher 1, den die Kühlflüssigkeit beschreibt, durch Pfeile gezeigt worden. Die Fig. 6, bei der das Abgasventil 4 weggelassen wurde, es schließt sich am oberen Bildrand an, zeigt, daß die Länge der Strömungskanäle für das Abgas 26 größer ist, als die Länge der Strömungskanäle 27 für die Kühlflüssigkeit. Das Abgas strömt in Richtung des Pfeiles B durch die Kanäle 26 auf das nicht gezeigte Abgasventil 4 und von dort weiter, wie bereits beschrieben wurde. Weitere Einzelheiten beschreibt die erwähnte deutsche Patentanmeldung Nr. 198 46 518.1The heat exchanger plates 25 have a bead which can be referred to as a circumferential shape 32 on. They lie on one another with their circumferential features 32 and thereby form the flow channels 27 for the coolant. 7 is the path through the exhaust gas heat exchanger 1, which the coolant describes has been shown by arrows. Fig. 6, in which the exhaust valve 4 has been omitted, it follows at the top of the picture, shows that the length of the flow channels for the exhaust gas 26 is greater than the length of the flow channels 27 for the cooling liquid. The exhaust gas flows in the direction of arrow B through the channels 26 onto the one not shown Exhaust valve 4 and on from there, as already described. Describes further details the aforementioned German patent application No. 198 46 518.1

Claims (11)

Abgaswärmetauscher (1) in einer Abgasrückführungsanordnung für Brennkraftmaschinen (6) mit einer Abgassammelleiste (2) und einer Abgasrückführleitung (3) und mit einem Ein-und Ausströmkanäle und ein Stellglied (5) aufweisenden Abgasventil (4), beispielsweise an einer Seite des Abgaswärmetauschers (1) befestigt oder mit dem Abgaswärmetauscher (1) eine Baueinheit bildend, oder nur in räumlicher Nähe zum Abgaswärmetauscher (1) angeordnet, wobei das Abgasventil (4) einen Teil des Abgasstromes entweder durch den Abgaswärmetauscher (1) in die Abgasrückführleitung (3) oder direkt in die Abgasrückführleitung (3) zum Saugrohr der Brennkraftmaschine (6) leitet und die Abgassammelleiste (2) Abzweige(Z1 - Z5) an die Zylinderköpfe der Brennkraftmaschine (6) und einen Austritt (12), beispielsweise zum Abgasturbolader (ATL) aufweist,
dadurch gekennzeichnet, daß
der Abgaswärmetauscher (1) an zwei Anschlüsse (15, 17) aufweisende Öffnungen (13, 14) in der Abgassammelleiste (2) angeschlossen ist, wobei zwischen der einen Öffnung (13) und der einen Seite des Abgaswärmetauschers (1) das Abgasventil (4) angeordnet ist und wobei die andere Seite des Abgaswärmetauschers (1) mit der anderen Öffnung (14) in Verbindung ist und mindestens eine der Öffnungen (13 oder 14) im Rückstaubereich (SB) der Abgase vor deren Austritt (12), in Strömungsrichtung der Abgase gesehen, angeordnet ist.Exhaust gas heat exchanger (1) in an exhaust gas recirculation arrangement for internal combustion engines (6) with an exhaust gas manifold (2) and an exhaust gas recirculation line (3) and with an exhaust valve (4) having inflow and outflow channels and an actuator (5), for example on one side of the exhaust gas heat exchanger ( 1) attached or with the exhaust gas heat exchanger (1) forming a structural unit, or only in close proximity to the exhaust gas heat exchanger (1), the exhaust valve (4) part of the exhaust gas flow either through the exhaust gas heat exchanger (1) into the exhaust gas recirculation line (3) or leads directly into the exhaust gas recirculation line (3) to the intake manifold of the internal combustion engine (6) and the exhaust manifold (2) has branches (Z1 - Z5) to the cylinder heads of the internal combustion engine (6) and an outlet (12), for example to the exhaust gas turbocharger (ATL),
characterized in that
the exhaust gas heat exchanger (1) is connected to two ports (15, 17) having openings (13, 14) in the exhaust manifold (2), the exhaust valve (4. between the one opening (13) and one side of the exhaust gas heat exchanger (1) ) is arranged and wherein the other side of the exhaust gas heat exchanger (1) is connected to the other opening (14) and at least one of the openings (13 or 14) in the backflow area (SB) of the exhaust gases before they exit (12), in the direction of flow Exhaust gases seen, is arranged. Abgaswärmetauscher nach Anspruch 1, dadurch gekennzeichnet, daß die eine Öffnung (13) den Anschluß (15) zum Einströmkanal (7) des Abgasventils (4) aufweist, die vorzugsweise diejenige Öffnung ist, die im Rückstaubereich (SB) der Abgase liegt, durch die das ungekühlte, zurückzuführende Abgas hindurchströmt und daß die andere Öffnung (14) in der Abgassammelleiste (2), die den Anschluß (17) zur anderen Seite - vorzugsweise zu der gegenüberliegenden Seite - des Abgaswärmetauschers (1) aufweist, jene ist, durch die das zu kühlende und zurückzuführende Abgas in den Abgaswärmetauscher (1) strömt.Exhaust gas heat exchanger according to claim 1, characterized in that the one opening (13) has the connection (15) to the inflow channel (7) of the exhaust gas valve (4), which is preferably that opening which is in the backflow area (SB) of the exhaust gases through which the uncooled exhaust gas to be returned flows through and that the other opening (14) in the exhaust manifold (2), which has the connection (17) to the other side - preferably to the opposite side - of the exhaust gas heat exchanger (1) is the one through which the Exhaust gas to be cooled and recycled flows into the exhaust gas heat exchanger (1). Abgaswärmetauscher nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Abgaswärmetauscher (1) in Richtung auf das Abgasventil (4) mit Abgas durchströmbar ist.Exhaust gas heat exchanger according to claim 1 or 2, characterized in that exhaust gas can flow through the exhaust gas heat exchanger (1) in the direction of the exhaust gas valve (4). Abgaswärmetauscher nach den Ansprüchen 1, 2 oder 3, dadurch gekennzeichnet, daß der Abgaswärmetauscher (1) zusätzlich mittels Halter (18, 19) an der Abgassammelleiste (2) befestigt sein kann.Exhaust gas heat exchanger according to claims 1, 2 or 3, characterized in that the exhaust gas heat exchanger (1) can additionally be fastened to the exhaust gas manifold (2) by means of holders (18, 19). Abgaswärmetauscher nach einem der vorstehenden Ansprüche , dadurch gekennzeichnet, daß mindestens die Öffnung (13) für die ungekühlten, zurückzuführenden Abgase nicht weiter als 1/2 der Gesamtlänge (L), vorzugsweise 1/3 der Gesamtlänge (L) der Abgassammelleiste (2), von dem Austritt (12) entfernt, angeordnet ist, wobei sich der Austritt (12) am Ende eines Anschlußkrümmers (23) befindet, in dem die Öffnung (13) vorzugsweise angeordnet ist.Exhaust gas heat exchanger according to one of the preceding claims, characterized in that at least the opening (13) for the uncooled exhaust gases to be returned is not more than 1/2 of the total length (L), preferably 1/3 of the total length (L) of the exhaust manifold (2), from the outlet (12), is arranged, the outlet (12) being located at the end of a connecting elbow (23) in which the opening (13) is preferably arranged. Abgaswärmetauscher nach einem der vorstehenden Ansprüche , dadurch gekennzeichnet, daß die Öffnung (14) für die zu kühlenden, zurückzuführenden Abgase, in Strömungsrichtung der Abgase gesehen, etwa im Bereich zwischen dem ersten und zweiten Abzweig (Z1; Z2) zu den Zylindern der Brennkraftmaschine (6) in der Abgassammelleiste (2) vorgesehen ist, jedoch auch etwa in der Mitte der Gesamtlänge (L) der Abgassammelleiste (2) angeordnet sein könnte.Exhaust gas heat exchanger according to one of the preceding claims, characterized in that the opening (14) for the exhaust gases to be cooled, which are to be returned, viewed in the flow direction of the exhaust gases, approximately in the region between the first and second branch (Z1; Z2) to the cylinders of the internal combustion engine ( 6) is provided in the exhaust manifold (2), but could also be arranged approximately in the middle of the total length (L) of the exhaust manifold (2). Abgaswärmetauscher nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Anschlüsse (15, 17) zwischen Abgassammelleiste (2) und Abgaswärmetauscher (1) bzw. Abgasventil (4) kurze Anschlußstutzen (10, 11) sind, die mit Anschlußflanschen (20, 21) ausgerüstet sind, so daß der Abgaswärmetauscher (1) etwa parallel zur Abgassammelleiste (2) und mit einem geringen Abstand dazu angeordnet ist.Exhaust gas heat exchanger according to one of the preceding claims, characterized in that the connections (15, 17) between the exhaust gas manifold (2) and the exhaust gas heat exchanger (1) or exhaust gas valve (4) are short connecting pieces (10, 11) which are provided with connecting flanges (20, 21 ) are equipped so that the exhaust gas heat exchanger (1) is arranged approximately parallel to the exhaust manifold (2) and at a short distance from it. Abgaswärmetauscher nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß als Kühlmittel die Kühlflüssigkeit der Brennkraftmaschine (6) verwendet wird.Exhaust gas heat exchanger according to one of the preceding claims, characterized in that the coolant of the internal combustion engine (6) is used as the coolant. Abgaswärmetauscher nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß das Abgasventil (4) einen Einströmkanal (7) für Abgase aus der Abgassammelleiste (2), einen Einströmkanal (8) für Abgase aus dem Abgaswärmetauscher (1) und einen Ausströmkanal (9) zur Rückführleitung (3) aufweist, und im Kreuzungspunkt der erwähnten Kanäle als Stellglied (5) eine Schaltklappe besitzt, mit der entweder der eine oder der andere Einströmkanal (7, 8) vollständig absperrbar ist, wobei der Ausströmkanal (9) ständig offen bleibt.Exhaust gas heat exchanger according to one of the preceding claims, characterized in that the exhaust valve (4) has an inflow channel (7) for exhaust gases from the exhaust manifold (2), an inflow channel (8) for exhaust gases from the exhaust gas heat exchanger (1) and an outflow channel (9) Has return line (3), and in the intersection of the channels mentioned as the actuator (5) has a switching flap with which either one or the other inflow channel (7, 8) can be completely shut off, the outflow channel (9) remaining open at all times. Abgaswärmetauscher nach Anspruch 9, dadurch gekennzeichnet, daß beide Einströmkanäle (7, 8) etwa auf einer Linie in Längsrichtung des Abgaswärmetauschers (1) angeordnet sind und der Ausströmkanal (9) senkrecht dazu.Exhaust gas heat exchanger according to claim 9, characterized in that both inflow channels (7, 8) are arranged approximately on a line in the longitudinal direction of the exhaust gas heat exchanger (1) and the outflow channel (9) perpendicular thereto. Abgaswärmetauscher nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der Abgaswärmetauscher (1) vorzugsweise ein gehäuseloser Plattenwärmetauscher gemäß Patentanmeldung DE 198 46 518.1 ist.Exhaust gas heat exchanger according to one of the preceding claims, characterized in that the exhaust gas heat exchanger (1) is preferably a housing-free plate heat exchanger according to patent application DE 198 46 518.1.
EP01103422A 2000-03-11 2001-02-14 Heat exchanger in an EGR arrangement Expired - Lifetime EP1132609B1 (en)

Applications Claiming Priority (2)

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DE10011954A DE10011954A1 (en) 2000-03-11 2000-03-11 Exhaust gas heat exchanger in an exhaust gas recirculation arrangement
DE10011954 2000-03-11

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EP1132609A3 EP1132609A3 (en) 2002-03-20
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EP (1) EP1132609B1 (en)
AT (1) ATE340924T1 (en)
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Also Published As

Publication number Publication date
ATE340924T1 (en) 2006-10-15
DE50111065D1 (en) 2006-11-09
EP1132609B1 (en) 2006-09-27
DE10011954A1 (en) 2001-09-13
US20010020363A1 (en) 2001-09-13
US6360532B2 (en) 2002-03-26
EP1132609A3 (en) 2002-03-20
ES2273753T3 (en) 2007-05-16

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