EP1937956A1 - Device for recirculating and cooling exhaust gas of an internal combustion engine - Google Patents

Device for recirculating and cooling exhaust gas of an internal combustion engine

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Publication number
EP1937956A1
EP1937956A1 EP06806021A EP06806021A EP1937956A1 EP 1937956 A1 EP1937956 A1 EP 1937956A1 EP 06806021 A EP06806021 A EP 06806021A EP 06806021 A EP06806021 A EP 06806021A EP 1937956 A1 EP1937956 A1 EP 1937956A1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
valve
egr
egr valve
oxidation catalyst
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.)
Withdrawn
Application number
EP06806021A
Other languages
German (de)
French (fr)
Inventor
Jens Ruckwied
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
Original Assignee
Behr GmbH and Co KG
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 filed Critical Behr GmbH and Co KG
Publication of EP1937956A1 publication Critical patent/EP1937956A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—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
    • 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
    • F02M26/11—Manufacture or assembly of EGR systems; Materials or coatings specially adapted for EGR systems
    • 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
    • F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • 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
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/25—Layout, e.g. schematics with coolers having bypasses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/35—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

Definitions

  • the invention relates to a device for the return and cooling of exhaust gas of an internal combustion engine, in particular a diesel engine of a motor vehicle according to the preamble of claim 1 - known from DE 10 2004 042 454 A1 of the applicant.
  • EGR exhaust gas recirculation
  • DE 10 2004 042 454 A1 of the applicant wherein in an exhaust gas recirculation line (EGR line) an exhaust gas recirculation valve (EGR valve) and an exhaust gas heat exchanger or exhaust gas cooler are arranged.
  • the internal combustion engine is a diesel engine which causes soot particles in the exhaust gas.
  • DOC diesel oxidation catalyst
  • HC hydrocarbons
  • the oxidation catalyst is partly also integrated into the exhaust gas cooler, in such a way that the oxidation-catalytic coating in the diffuser (intake Stutzen) of the exhaust gas cooler and / or on the inner walls of the exhaust pipes is arranged.
  • a similar exhaust gas recirculation system for a diesel engine was known from DE 94 21 145 U1, wherein in an EGR line also an oxidation catalyst and an exhaust gas cooler are arranged behind one another or integrated with each other. By an oxidation catalysis of the hydrocarbons contained in the diesel exhaust, a sticking of the exhaust gas cooler with soot particles is avoided.
  • EP 1 203 148 B1 has disclosed an EGR system for a diesel engine, wherein an oxidation catalytic converter and a soot filter are arranged in an exhaust gas line downstream of an exhaust gas turbine. Downstream of the oxidation catalyst, but upstream of the soot filter branches off an EGR line, in which an exhaust gas cooler and downstream of the exhaust gas cooler, an EGR valve is arranged. The recirculated exhaust gas is fed into an intake pipe and fed to the diesel engine via a first intercooler, a compressor and a second intercooler.
  • a disadvantage of the known EGR systems is that the EGR valve itself is not optimally protected against contamination, in particular soot deposition.
  • the oxidation catalytic converter is arranged upstream of the EGR valve in the flow direction of the exhaust gas, in particular directly in front of the EGR valve.
  • the oxidation catalytic converter can either be located in the exhaust gas line in front of or behind an exhaust gas turbine or arranged in the EGR line.
  • the EGR valve is located in the flow direction in front of the exhaust gas cooler, ie on its "hot" side .
  • the EGR valve is arranged directly in front of the exhaust gas heat exchanger, by means of which both the EGR valve and the exhaust gas cooler are in front of one another Soot deposit protected.
  • the oxidation catalyst is integrated into the EGR valve.
  • the diesel oxidation catalyst (DOC) preferably consists of a noble metal coating, which is applied to a carrier.
  • the noble metal is preferably platinum.
  • the carrier body of the oxidation catalyst is integrated tor together with the Oxidationskatalysa-, in particular in the inlet of the EGR valve.
  • the carrier body is in particular designed such that it fills the entire cross section of the inlet.
  • the carrier body is in particular cylindrical, conical, etc. formed.
  • the space is optimally utilized and increases the surface of the oxidation catalyst in an advantageous manner.
  • the oxidation catalyst is integrated in particular as a coating directly in the inlet of the EGR valve.
  • this saves in particular the carrier material.
  • an EGR valve When integrated into the EGR valve, the inner wall of the EGR valve, which is acted upon by the exhaust gas, serves as a carrier for the oxidation-catalytic coating.
  • An EGR valve consists inter alia of a diffuser, ie an inlet nozzle, a valve housing and a valve closure member, for. B. a valve disk - these parts are covered by the exhaust gas and can therefore be coated oxidation catalysed, thereby preventing condense of hydrocarbons contained in the exhaust gas and thus sticking of soot particles on the walls of the EGR Valve is prevented.
  • an additional Oxidati- onskatalysator could be omitted in the EGR line or dimensioned correspondingly smaller.
  • the EGR valve with oxidation catalytic coating can be integrated with the exhaust gas cooler to form a structural unit, as is known per se from DE 197 50 588 A1 of the Applicant. Again, the EGR valve is located on the "hot" side of the exhaust gas cooler.
  • the exhaust gas cooler may additionally have a bypass for the exhaust gas, which is controlled by a bypass valve - such an exhaust gas heat exchanger with internal bypass is known for example from DE 102 03 003 A1.
  • the EGR valve, the bypass valve, the oxidation catalyst and the exhaust gas heat exchanger are integrally formed. In an advantageous manner, in particular the installation space is thereby reduced.
  • the single FIGURE shows a schematic illustration of an exhaust gas recirculation system (EGR system) 1 for an internal combustion engine designed as a diesel engine 2.
  • the diesel engine 2 has an exhaust pipe 3, in which an exhaust gas turbine 4 is arranged, which drives a compressor 5.
  • the diesel engine 2 is associated with a suction line 6, in which the compressor 5 and a charge air cooler 7 are arranged.
  • An exhaust gas recirculation line (EGR line) 8 is switched on between the exhaust line 3 and the intake line 6, the exhaust gas being taken off at a branching point 9 in the flow direction upstream of the exhaust gas turbine 4 and fed to the intake line 6 at a feed point 10.
  • an oxidation catalytic converter 11 In the EGR line 8, an oxidation catalytic converter 11, an exhaust gas recirculation valve (EGR valve) 12 and an exhaust gas cooler 13 are arranged in succession in the flow direction of the exhaust gas.
  • the EGR valve 12 is thus disposed on the "hot" side of exhaust gas cooler 13, and the oxidation catalyst 11 for converting hydrocarbons (HC) contained in the diesel exhaust gas is disposed upstream of EGR valve 12.
  • the oxidation catalyst 11 is known from the aforementioned prior art: it consists of a ceramic or metallic carrier (honeycomb body) which is provided with an oxidation-catalytic coating, in particular platinum.
  • the EGR valve 12 is also known from the prior art and may be designed so that it controls only the exhaust gas recirculation amount and z. B. is designed as a poppet valve. Alternatively, the EGR valve can also - which is not shown - be designed as a so-called combination valve with two functions. Such a valve regulates the exhaust gas recirculation amount. In addition, such a valve takes over the switching function between cooling and bypass operation in an exhaust gas heat exchanger with bypass.
  • Such a combination valve is known, for example, from unpublished DE102005041146, from unpublished DE102005041149 and from unpublished DE102005041150, the entire contents of which are hereby expressly disclosed.
  • the oxidation catalyst 11 can be integrated into the EGR valve 12.
  • the oxidation-catalytic coating is arranged on the inner wall of the EGR valve, that is, for example, on the inner wall of a diffuser or a valve housing or a valve disk.
  • the upstream oxidation catalyst can be completely or partially dispensed with, at the same time the EGR valve is protected from contamination.
  • the EGR valve 12 may be integrated with the exhaust gas cooler 13 to form a structural unit, wherein the EGR valve has its upstream position to the exhaust gas cooler, i. H. maintains on its "hotter" side.

Abstract

The invention relates to a device for recirculating and cooling exhaust gas of an internal combustion engine, particularly a diesel engine (2) of a motor vehicle. The internal combustion engine (2) comprises an intake duct (6), an exhaust pipe (3), and an exhaust gas recirculation pipe (EGR pipe, 8). At least one exhaust gas heat exchanger (13), an EGR valve (12), and an oxidation catalyst (11) that is provided with an oxidation catalytic coating are disposed in the exhaust pipe or EGR pipe (3, 8). The oxidation catalyst (11) is positioned upstream from the EGR valve (12) in the direction of flow of the exhaust gas.

Description

BEHR GmbH & Co. KG Mauserstraße 3, 70469 Stuttgart BEHR GmbH & Co. KG Mauserstrasse 3, 70469 Stuttgart
Vorrichtung zur Rückführung und Kühlung von Abgas einerDevice for recirculation and cooling of exhaust gas
BrennkraftmaschineInternal combustion engine
Die Erfindung betrifft eine Vorrichtung zur Rückführung und Kühlung von Ab- gas einer Brennkraftmaschine, insbesondere eines Dieselmotors eines Kraftfahrzeuges nach dem Oberbegriff des Patentanspruches 1 - bekannt durch die DE 10 2004 042 454 A1 der Anmelderin.The invention relates to a device for the return and cooling of exhaust gas of an internal combustion engine, in particular a diesel engine of a motor vehicle according to the preamble of claim 1 - known from DE 10 2004 042 454 A1 of the applicant.
Eine Vorrichtung zur Rückführung und Kühlung von Abgas, ein so genanntes Abgasrückführsystem (AGR-System) wurde durch die DE 10 2004 042 454 A1 der Anmelderin bekannt, wobei in einer Abgasrückführleitung (AGR- Leitung) ein Abgasrückführventil (AGR-Ventil) sowie ein Abgaswärmeübertrager bzw. Abgaskühler angeordnet sind. Die Brennkraftmaschine ist ein Dieselmotor, welcher Rußpartikel im Abgas verursacht. In Strömungsrichtung vor dem Abgaskühler ist daher ein Diesel-Oxidationskatalysator (DOC) angeordnet, welcher im Dieselabgas enthaltene Kohlenwasserstoffe (HC) konvertiert, was mittelbar auch eine Rußablagerung verhindert bzw. reduziert. Die Kohlenwasserstoffe neigen nämlich dazu, an den gekühlten Flächen des Abgaskühlers auszukondensieren und bilden dann eine klebrige Schicht, welche die Rußpartikel bindet und somit eine Verschmutzung des Abgaskühlers, verbunden mit einer Leistungsminderung, zur Folge hat. Durch Oxidati- on der Kohlenwasserstoffe werden diese „getrocknet" und verlieren somit ihre „klebrigen" Eigenschaften. Bei dem bekannten AGR-System ist der Oxi- dationskatalysator teilweise auch in den Abgaskühler integriert, und zwar derart, dass die oxidationskatalytische Beschichtung im Diffusor (Einlass- stutzen) des Abgaskühlers und/oder auf den Innenwandungen der Abgas- rohre angeordnet ist.A device for recirculation and cooling of exhaust gas, a so-called exhaust gas recirculation (EGR) system has been known from DE 10 2004 042 454 A1 of the applicant, wherein in an exhaust gas recirculation line (EGR line) an exhaust gas recirculation valve (EGR valve) and an exhaust gas heat exchanger or exhaust gas cooler are arranged. The internal combustion engine is a diesel engine which causes soot particles in the exhaust gas. In the flow direction in front of the exhaust gas cooler, therefore, a diesel oxidation catalyst (DOC) is arranged, which converts hydrocarbons (HC) contained in the diesel exhaust gas, which indirectly also prevents or reduces soot deposition. The hydrocarbons tend to condense on the cooled surfaces of the exhaust gas cooler and then form a sticky layer, which binds the soot particles and thus contamination of the exhaust gas cooler, combined with a reduction in performance, the result. Oxidation of the hydrocarbons causes them to "dry" and thus lose their "sticky" properties. In the known EGR system, the oxidation catalyst is partly also integrated into the exhaust gas cooler, in such a way that the oxidation-catalytic coating in the diffuser (intake Stutzen) of the exhaust gas cooler and / or on the inner walls of the exhaust pipes is arranged.
Ein ähnliches Abgasrückführungssystem für einen Dieselmotor wurde durch die DE 94 21 145 U1 bekannt, wobei in einer AGR-Leitung ebenfalls ein O- xidationskatalysator und ein Abgaskühler hintereinander oder miteinander integriert angeordnet sind. Durch eine Oxidationskatalyse der im Dieselabgas enthaltenen Kohlenwasserstoffe wird ein Verkleben des Abgaskühlers mit Rußpartikeln vermieden.A similar exhaust gas recirculation system for a diesel engine was known from DE 94 21 145 U1, wherein in an EGR line also an oxidation catalyst and an exhaust gas cooler are arranged behind one another or integrated with each other. By an oxidation catalysis of the hydrocarbons contained in the diesel exhaust, a sticking of the exhaust gas cooler with soot particles is avoided.
Durch die EP 1 203 148 B1 wurde ein AGR-System für einen Dieselmotor bekannt, wobei in einer Abgasleitung stromabwärts von einer Abgasturbine ein Oxidationskatalysator und ein Rußfilter angeordnet sind. Stromabwärts des Oxidationskatalysators, jedoch stromaufwärts des Rußfilters zweigt eine AGR-Leitung ab, in welcher ein Abgaskühler sowie stromabwärts des Abgaskühlers ein AGR-Ventil angeordnet ist. Das rückgeführte Abgas wird in eine Ansaugleitung eingespeist und über einen ersten Zwischenkühler, einen Verdichter sowie einen zweiten Zwischenkühler dem Dieselmotor zugeführt.EP 1 203 148 B1 has disclosed an EGR system for a diesel engine, wherein an oxidation catalytic converter and a soot filter are arranged in an exhaust gas line downstream of an exhaust gas turbine. Downstream of the oxidation catalyst, but upstream of the soot filter branches off an EGR line, in which an exhaust gas cooler and downstream of the exhaust gas cooler, an EGR valve is arranged. The recirculated exhaust gas is fed into an intake pipe and fed to the diesel engine via a first intercooler, a compressor and a second intercooler.
Nachteilig bei den bekannten AGR-Systemen ist, dass das AGR-Ventil selbst nicht optimal gegen Verschmutzung, insbesondere Rußablagerung geschützt ist.A disadvantage of the known EGR systems is that the EGR valve itself is not optimally protected against contamination, in particular soot deposition.
Es ist Aufgabe der vorliegenden Erfindung, bei einer Vorrichtung zur Abgas- rückführung der eingangs genannten Art eine Verschmutzung des AGR- Ventils zu vermeiden bzw. zu verringern.It is an object of the present invention, in a device for exhaust gas recirculation of the type mentioned to avoid or reduce contamination of the EGR valve.
Diese Aufgabe wird durch die Merkmale des Patentanspruches 1 gelöst. Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteran- Sprüchen.This object is solved by the features of claim 1. Advantageous embodiments of the invention will become apparent from the subclaims.
Erfindungsgemäß ist vorgesehen, dass der Oxidationskatalysator in Strömungsrichtung des Abgases vor dem AGR-Ventil, insbesondere unmittelbar vor dem AGR-Ventil angeordnet ist. Damit wird der Vorteil erreicht, dass auch das AGR-Ventil infolge Oxidation der Kohlenwasserstoffe vor Ver- schmutzung, insbesondere Rußablagerung geschützt ist. Der Oxidationska- talysator kann sich dabei entweder in der Abgasleitung vor oder hinter einer Abgasturbine befinden oder in der AGR-Leitung angeordnet sein. Vorteilhafterweise befindet sich das AGR-Ventil in Strömungsrichtung vor dem Ab- gaskühler, d. h. auf dessen „heißer" Seite. Insbesondere ist das AGR-Ventil unmittelbar vor dem Abgaswärmeübertrager angeordnet. Durch diese Anordnung wird sowohl das AGR-Ventil als auch der Abgaskühler vor einer Rußablagerung geschützt.According to the invention, it is provided that the oxidation catalytic converter is arranged upstream of the EGR valve in the flow direction of the exhaust gas, in particular directly in front of the EGR valve. This has the advantage that the EGR valve can also be used as a result of oxidation of the hydrocarbons. pollution, especially soot deposition is protected. The oxidation catalytic converter can either be located in the exhaust gas line in front of or behind an exhaust gas turbine or arranged in the EGR line. Advantageously, the EGR valve is located in the flow direction in front of the exhaust gas cooler, ie on its "hot" side .In particular, the EGR valve is arranged directly in front of the exhaust gas heat exchanger, by means of which both the EGR valve and the exhaust gas cooler are in front of one another Soot deposit protected.
Nach einer vorteilhaften Ausgestaltung der Erfindung ist der Oxidationskata- lysator in das AGR-Ventil integriert. Der Dieseloxidationskatalysator (DOC) besteht vorzugsweise aus einer Edelmetall-Beschichtung, welche auf einen Träger aufgebracht ist. Das Edelmetall ist vorzugsweise Platin.According to an advantageous embodiment of the invention, the oxidation catalyst is integrated into the EGR valve. The diesel oxidation catalyst (DOC) preferably consists of a noble metal coating, which is applied to a carrier. The noble metal is preferably platinum.
In einer weiteren vorteilhaften Ausgestaltung der Erfindung ist der Trägerkörper des Oxidationskatalysators zusammen mit dem Oxidationskatalysa- tor, insbesondere im Einlass des AGR-Ventils integriert. Der Trägerkörper ist dabei insbesondere derart ausgebildet, dass er den gesamten Querschnitt des Einlasses ausfüllt. Der Trägerkörper ist insbesondere zylindrisch, ko- nisch usw. ausgebildet. In vorteilhafter Weise wird der Bauraum optimal ausgenutzt und die Oberfläche des Oxidationskatalysators in vorteilhafter Weise vergrößert.In a further advantageous embodiment of the invention, the carrier body of the oxidation catalyst is integrated tor together with the Oxidationskatalysa-, in particular in the inlet of the EGR valve. The carrier body is in particular designed such that it fills the entire cross section of the inlet. The carrier body is in particular cylindrical, conical, etc. formed. Advantageously, the space is optimally utilized and increases the surface of the oxidation catalyst in an advantageous manner.
In einer Weiterbildung der Erfindung ist der Oxidationskatalysator insbeson- dere als Beschichtung direkt im Einlass des AGR-Ventils integriert. In vorteilhafter Weise wird dadurch insbesondere das Trägermaterial eingespart.In one development of the invention, the oxidation catalyst is integrated in particular as a coating directly in the inlet of the EGR valve. Advantageously, this saves in particular the carrier material.
Bei einer Integration in das AGR-Ventil dient die Innenwandung des AGR- Ventils, welche vom Abgas beaufschlagt wird, als Träger für die oxidations- katalytische Beschichtung. Ein AGR-Ventil besteht u. a. aus einem Diffusor, d. h. einem Einlassstutzen, einem Ventilgehäuse und einem Ventilschließglied, z. B. einem Ventilteller - diese Teile werden vom Abgas überströmt und können daher oxidationskatalytisch beschichtet werden, wodurch ein Auskondensieren von im Abgas enthaltenen Kohlenwasserstoffen verhindert und somit ein Festkleben von Rußpartikeln an den Wandungen des AGR- Ventils unterbunden wird. In diesem Falle könnte ein zusätzlicher Oxidati- onskatalysator in der AGR-Leitung entfallen bzw. entsprechend kleiner dimensioniert werden.When integrated into the EGR valve, the inner wall of the EGR valve, which is acted upon by the exhaust gas, serves as a carrier for the oxidation-catalytic coating. An EGR valve consists inter alia of a diffuser, ie an inlet nozzle, a valve housing and a valve closure member, for. B. a valve disk - these parts are covered by the exhaust gas and can therefore be coated oxidation catalysed, thereby preventing condense of hydrocarbons contained in the exhaust gas and thus sticking of soot particles on the walls of the EGR Valve is prevented. In this case, an additional Oxidati- onskatalysator could be omitted in the EGR line or dimensioned correspondingly smaller.
Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung kann das AGR-Ventil mit oxidationskatalytischer Beschichtung mit dem Abgaskühler zu einer Baueinheit integriert werden, wie dies an sich bereits aus der DE 197 50 588 A1 der Anmelderin bekannt ist. Auch hier ist das AGR-Ventil auf der „heißen" Seite des Abgaskühlers angeordnet.According to a further advantageous embodiment of the invention, the EGR valve with oxidation catalytic coating can be integrated with the exhaust gas cooler to form a structural unit, as is known per se from DE 197 50 588 A1 of the Applicant. Again, the EGR valve is located on the "hot" side of the exhaust gas cooler.
Der Abgaskühler kann zusätzlich einen Bypass für das Abgas aufweisen, welcher durch ein Bypassventil gesteuert wird - ein derartiger Abgaswärmeübertrager mit internem Bypass ist beispielsweise aus der DE 102 03 003 A1 bekannt.The exhaust gas cooler may additionally have a bypass for the exhaust gas, which is controlled by a bypass valve - such an exhaust gas heat exchanger with internal bypass is known for example from DE 102 03 003 A1.
In einer Weiterbildung der Erfindung sind das AGR-Ventil, das Bypassventil, der Oxidationskatalysator und der Abgaswärmeübertrager einteilig ausgebildet. In vorteilhafter Weise wird dadurch insbesondere der Bauraum reduziert.In one embodiment of the invention, the EGR valve, the bypass valve, the oxidation catalyst and the exhaust gas heat exchanger are integrally formed. In an advantageous manner, in particular the installation space is thereby reduced.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im Folgenden näher beschrieben.An embodiment of the invention is illustrated in the drawing and will be described in more detail below.
Die einzige Figur zeigt in schematischer Darstellung ein Abgasrückführsys- tem (AGR-System) 1 für eine als Dieselmotor 2 ausgebildete Brennkraftmaschine. Der Dieselmotor 2 weist eine Abgasleitung 3 auf, in welcher eine Ab- gasturbine 4 angeordnet ist, welche einen Verdichter 5 antreibt. Dem Dieselmotor 2 ist eine Ansaugleitung 6 zugeordnet, in welcher der Verdichter 5 und ein Ladeluftkühler 7 angeordnet sind. Zwischen Abgasleitung 3 und An- saugleitung 6 ist eine Abgasrückführleitung (AGR-Leitung) 8 eingeschaltet, wobei das Abgas an einem Verzweigungspunkt 9 in Strömungsrichtung vor der Abgasturbine 4 entnommen und an einem Einspeisungspunkt 10 der Ansaugleitung 6 zugeführt wird. In der AGR-Leitung 8 sind in Strömungsrichtung des Abgases hintereinander ein Oxidationskatalysator 11 , ein Abgas- rückführventil (AGR-Ventil) 12 und ein Abgaskühler 13 angeordnet. Das AGR- Ventil 12 ist somit auf der „heißen" Seite des Abgaskühlers 13 angeordnet, und der Oxidationskatalysator 11 zur Konvertierung von im Dieselabgas enthaltenen Kohlenwasserstoffen (HC) ist stromaufwärts vom AGR- Ventil 12 angeordnet.The single FIGURE shows a schematic illustration of an exhaust gas recirculation system (EGR system) 1 for an internal combustion engine designed as a diesel engine 2. The diesel engine 2 has an exhaust pipe 3, in which an exhaust gas turbine 4 is arranged, which drives a compressor 5. The diesel engine 2 is associated with a suction line 6, in which the compressor 5 and a charge air cooler 7 are arranged. An exhaust gas recirculation line (EGR line) 8 is switched on between the exhaust line 3 and the intake line 6, the exhaust gas being taken off at a branching point 9 in the flow direction upstream of the exhaust gas turbine 4 and fed to the intake line 6 at a feed point 10. In the EGR line 8, an oxidation catalytic converter 11, an exhaust gas recirculation valve (EGR valve) 12 and an exhaust gas cooler 13 are arranged in succession in the flow direction of the exhaust gas. The EGR valve 12 is thus disposed on the "hot" side of exhaust gas cooler 13, and the oxidation catalyst 11 for converting hydrocarbons (HC) contained in the diesel exhaust gas is disposed upstream of EGR valve 12.
Der Oxidationskatalysator 11 ist aus dem eingangs genannten Stand der Technik bekannt: er besteht aus einem keramischen oder metallischen Träger (Wabenkörper), welcher mit einer oxidationskatalytischen Beschichtung, insbesondere Platin versehen ist. Das AGR-Ventil 12 ist ebenfalls aus dem Stand der Technik bekannt und kann so gestaltet sein, dass es ausschließlich die Abgasrückführmenge regelt und z. B. als Tellerventil ausgebildet ist. Alternativ kann das AGR-Ventil auch - was nicht dargestellt ist - als so genanntes Kombiventil mit zwei Funktionen ausgebildet sein. Ein solches Ventil regelt die Abgasrückführmenge. Zusätzlich übernimmt ein solches Ventil die Schaltfunktion zwischen Kühl- und Bypassbetrieb bei einem Abgaswärmeübertrager mit Bypass. Ein solches Kombiventil ist beispielsweise aus der unveröffentlichten DE102005041146, aus der unveröffentlichten DE102005041149 und aus der unveröffentlichten DE102005041150 bekannt, deren gesamter Inhalt hiermit ausdrücklich offenbart ist.The oxidation catalyst 11 is known from the aforementioned prior art: it consists of a ceramic or metallic carrier (honeycomb body) which is provided with an oxidation-catalytic coating, in particular platinum. The EGR valve 12 is also known from the prior art and may be designed so that it controls only the exhaust gas recirculation amount and z. B. is designed as a poppet valve. Alternatively, the EGR valve can also - which is not shown - be designed as a so-called combination valve with two functions. Such a valve regulates the exhaust gas recirculation amount. In addition, such a valve takes over the switching function between cooling and bypass operation in an exhaust gas heat exchanger with bypass. Such a combination valve is known, for example, from unpublished DE102005041146, from unpublished DE102005041149 and from unpublished DE102005041150, the entire contents of which are hereby expressly disclosed.
Nach einer bevorzugten Ausführungsform der Erfindung, welche nicht in der Zeichnung dargestellt ist, kann der Oxidationskatalysator 11 in das AGR- Ventil 12 integriert werden. Hierzu wird die oxidationskatalytische Beschichtung auf der Innenwandung des AGR-Ventils angeordnet, also beispielswei- se auf der Innenwand eines Diffusors oder eines Ventilgehäuses oder eines Ventiltellers. Damit kann auf den vorgeschalteten Oxidationskatalysator ganz oder teilweise verzichtet werden, wobei gleichzeitig das AGR-Ventil vor Verschmutzung geschützt ist. Ferner kann - was nicht dargestellt ist - das AGR- Ventil 12 mit dem Abgaskühler 13 zu einer Baueinheit integriert werden, wo- bei das AGR-Ventil seine stromaufwärtige Position zum Abgaskühler, d. h. auf dessen „heißer" Seite beibehält. According to a preferred embodiment of the invention, which is not shown in the drawing, the oxidation catalyst 11 can be integrated into the EGR valve 12. For this purpose, the oxidation-catalytic coating is arranged on the inner wall of the EGR valve, that is, for example, on the inner wall of a diffuser or a valve housing or a valve disk. Thus, the upstream oxidation catalyst can be completely or partially dispensed with, at the same time the EGR valve is protected from contamination. Furthermore, which is not shown, the EGR valve 12 may be integrated with the exhaust gas cooler 13 to form a structural unit, wherein the EGR valve has its upstream position to the exhaust gas cooler, i. H. maintains on its "hotter" side.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Vorrichtung zur Rückführung und Kühlung von Abgas einer Brennkraftmaschine, insbesondere eines Dieselmotors (2) eines Kraftfahrzeuges, wobei die Brennkraftmaschine (2) mindestens eine An- saugleitung (6) und mindestens eine Abgasleitung (3) sowie mindestens eine Abgasrückführleitung (AGR-Leitung) (8) aufweist und in der Abgas- bzw. AGR-Leitung (3, 8) mindestens ein Abgaswärmeübertrager (13), mindestens ein AGR-Ventil (12) sowie mindestens ein eine oxidationskatalytische Beschichtung aufweisender Oxidationskataly- sator (11) angeordnet sind, dadurch gekennzeichnet, dass der Oxi- dationskatalysator (11) in Strömungsrichtung des Abgases vor dem AGR-Ventil (12) angeordnet ist.1. An apparatus for returning and cooling exhaust gas of an internal combustion engine, in particular a diesel engine (2) of a motor vehicle, wherein the internal combustion engine (2) at least one suction line (6) and at least one exhaust pipe (3) and at least one exhaust gas recirculation line (EGR line ) (8) and in the exhaust gas or EGR line (3, 8) at least one exhaust gas heat exchanger (13), at least one EGR valve (12) and at least one oxidizing catalytic coating exhibiting Oxidationskataly- (11) are arranged , characterized in that the oxidation dationskatalysator (11) in the flow direction of the exhaust gas in front of the EGR valve (12) is arranged.
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass der Oxidationskatalysator (11 ) in der Abgasleitung (3) angeordnet ist.2. Device according to claim 1, characterized in that the oxidation catalyst (11) in the exhaust pipe (3) is arranged.
3. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass der Oxidationskatalysator (11) in der AGR-Leitung (8) angeordnet ist.3. Device according to claim 1, characterized in that the oxidation catalyst (11) in the EGR line (8) is arranged.
4. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das AGR-Ventil (12) in der AGR-Leitung (8) angeordnet ist.4. Device according to one of the preceding claims, characterized in that the EGR valve (12) in the EGR line (8) is arranged.
5. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das AGR-Ventil (12) in Strömungsrichtung des5. Device according to one of the preceding claims, characterized in that the EGR valve (12) in the flow direction of the
Abgases vor dem Abgaswärmeübertrager (13) angeordnet ist.Exhaust gas is arranged in front of the exhaust gas heat exchanger (13).
6. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Oxidationskatalysator (11) in das AGR- Ventil (12) integriert ist. 6. Device according to one of the preceding claims, characterized in that the oxidation catalyst (11) in the EGR valve (12) is integrated.
7. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das AGR-Ventil (12) vom Abgas überströmte Oberflächen, insbesondere die eines Diffusors, eines Ventilgehäuses und/oder eines Ventilschließgliedes aufweist und dass die oxidations- katalytische Beschichtung auf den Oberflächen angeordnet ist.7. Device according to one of the preceding claims, characterized in that the EGR valve (12) from the exhaust gas flowed over surfaces, in particular that of a diffuser, a valve housing and / or a valve closing member and that the oxidation catalytic coating is disposed on the surfaces ,
8. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das AGR-Ventil (12) mit dem Abgaswärmeü- bertrager (13) eine integrierte Baueinheit bildet und in Strömungsrichtung des Abgases vor dem Abgaswärmeübertrager (13) angeordnet ist.8. Device according to one of the preceding claims, characterized in that the EGR valve (12) with the Abgaswärmeü- bertrager (13) forms an integrated unit and is arranged in the flow direction of the exhaust gas in front of the exhaust gas heat exchanger (13).
9. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Abgaswärmeübertrager (13) einen By- passkanal und ein Bypassventil aufweist.9. Device according to one of the preceding claims, characterized in that the exhaust gas heat exchanger (13) has a bypass passage and a by-pass valve.
10. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das AGR-Ventil (12) und das Bypassventil ein- teilg, insbesondere als Kombiventil, ausgebildet sind.10. Device according to one of the preceding claims, characterized in that the EGR valve (12) and the bypass valve einteilg, in particular as a combination valve, are formed.
11.Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das AGR-Ventil (12), das Bypassventil, der Oxidationskatalysator (11) und der Abgaswärmeübertrager (13) eintei- Ng ausgebildet sind. 11.Vorrichtung according to any one of the preceding claims, characterized in that the EGR valve (12), the bypass valve, the oxidation catalyst (11) and the exhaust gas heat exchanger (13) are formed eing- Ng.
EP06806021A 2005-10-12 2006-10-14 Device for recirculating and cooling exhaust gas of an internal combustion engine Withdrawn EP1937956A1 (en)

Applications Claiming Priority (2)

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DE102005049309A DE102005049309A1 (en) 2005-10-12 2005-10-12 Device for returning and cooling exhaust gas of an internal combustion engine
PCT/EP2006/009581 WO2007042181A1 (en) 2005-10-12 2006-10-04 Device for recirculating and cooling exhaust gas of an internal combustion engine

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