EP2153033A1 - Exhaust gas purification device for an exhaust gas system - Google Patents

Exhaust gas purification device for an exhaust gas system

Info

Publication number
EP2153033A1
EP2153033A1 EP08735376A EP08735376A EP2153033A1 EP 2153033 A1 EP2153033 A1 EP 2153033A1 EP 08735376 A EP08735376 A EP 08735376A EP 08735376 A EP08735376 A EP 08735376A EP 2153033 A1 EP2153033 A1 EP 2153033A1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
substrate
purification device
gas purification
hollow body
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Withdrawn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
EP08735376A
Other languages
German (de)
French (fr)
Inventor
Wolfgang Hahnl
Marek Birke
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.)
Faurecia Emissions Control Technologies Germany GmbH
Original Assignee
Emcon Technologies Germany Augsburg GmbH
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 Emcon Technologies Germany Augsburg GmbH filed Critical Emcon Technologies Germany Augsburg GmbH
Publication of EP2153033A1 publication Critical patent/EP2153033A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • B01D46/12—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces in multiple arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
    • B01D46/58—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/0211—Arrangements for mounting filtering elements in housing, e.g. with means for compensating thermal expansion or vibration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/20—Shape of filtering material
    • B01D2275/206—Special forms, e.g. adapted to a certain housing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
    • B01D2279/30—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for treatment of exhaust gases from IC Engines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to an exhaust gas purification device for an exhaust system.
  • an exhaust gas purification device is to be understood, for example, as a particulate filter, an oxidation catalytic converter or a NO x storage catalytic converter.
  • Such an exhaust gas purification device usually contains a gas-permeable substrate through which the exhaust gas flows, whereby the exhaust gas is purified.
  • a particulate filter for example, soot particles contained in the exhaust gas are filtered from the exhaust gas as it flows through the substrate.
  • the substrate materials used are usually brittle and have a low flexural strength.
  • the invention provides an exhaust gas purification device, which is characterized by a simple production even when using brittle substrate materials and in which moreover the substrate heats up quickly during operation in order to achieve the temperature necessary for effective operation or for regeneration of the exhaust gas purification device.
  • an exhaust gas purification device for an exhaust system for this purpose, with a housing having an input and an output, and designed as a hollow body gas-permeable substrate which is arranged in the flow path from the input to the output, wherein the hollow body is composed of a plurality of flat substrate plates.
  • the interior of the hollow body is in flow communication with the inlet, so that the flow path of the exhaust gas from the inlet through the substrate and then leads to the output.
  • the substrate is heated, which has a comparatively low thermal mass as a hollow body, before the housing can withdraw a relatively large amount of heat from the exhaust gas stream.
  • the hollow body is composed of a plurality of flat (ie flat) substrate plates, it can be easily made of brittle material and safely in the housing hold. Bending of the substrate material is not required, which is why impermissible bending stresses occur neither during production nor during operation in the exhaust system.
  • a second substrate is arranged in the interior of the substrate, which is likewise a hollow body composed of a plurality of flat substrate plates.
  • a second flow path is created from the interior of the first substrate through the second substrate into its interior and from there to the exit.
  • the hollow body preferably has a shape which corresponds to a lateral surface of a truncated pyramid. When using two nested hollow bodies, these are then placed in particular in opposite directions.
  • the hollow body can of course also be designed as a hollow cylinder, that is to say with a plate spacing which is constant over its entire length.
  • the substrate plates are in particular a trapezoidal shape in the case of a truncated pyramidal shape of the hollow body, wherein in the case of two substrates, the substrate plates of the inner hollow body are made smaller than those of the outer hollow body.
  • the substrate plates are preferably held by a frame construction.
  • the frame construction may include a plurality of fastener elements for the substrate plates, which may be e.g. clips, nails or rivets that hold the substrate plates to the frame construction.
  • the frame construction may consist of cross-sectionally U-shaped profiles in which the substrate plates are held directly, for example.
  • the substrates used are usually brittle materials.
  • the substrate plates comprise at least one of the following materials: metal foam, metallic sponge structure, metal fibers, metallic sintered hollow spheres, wire mesh, wire mesh, expanded metal, ceramic fibers and ceramic foam. All these materials are characterized by their high porosity.
  • the substrate plates can be provided with a catalytically active coating.
  • a respective holder for the upstream end and for the downstream end of the substrate is provided, which is formed substantially as a flat bottom or disc with at least one passage opening. In this way, the substrate can be easily and safely stored in the housing.
  • the hollow body has a plurality of stacked substrate plates made of different materials.
  • the exhaust gas purification device may be a particulate filter, a particulate matter storage, an oxidation catalyst or a NO x -
  • Oxidation catalyst conceivable.
  • FIG. 1 shows a longitudinal section through an exhaust gas purification device according to a first embodiment of the invention
  • FIG. 2 is a view of a substrate plate used in the exhaust gas purification device of FIG. 1;
  • FIG. 3 is a view of a frame element used in the exhaust gas purification device of FIG. 1;
  • FIG. 4 is a section along the line IV-IV in Figure 3, but with inserted substrate plate;
  • FIG. 5 is a schematic perspective view of the frame construction of FIG. 5
  • FIG. 6 shows a view of a frame element according to an alternative embodiment
  • FIG. 7 is a section along the line VII-VII in Figure 6, but with inserted substrate plate;
  • FIG. 8 is a sectional view similar to FIG. 7, but for an alternatively formed substrate
  • FIG. 9 shows a schematic perspective view of a frame construction with holders for an exhaust gas purification device according to a second embodiment of the invention.
  • FIG. 10 is a sectional view of part of the frame construction of FIG. 9.
  • Figure 11 is a sectional view of a slightly modified compared to Figure 10 frame construction.
  • FIG. 1 shows an exhaust gas purification device 10 according to a first embodiment
  • Embodiment of the invention which may be a particulate filter, a particulate trap, an oxidation catalyst, a NO x storage catalyst or any combination thereof.
  • the exhaust gas purification device 10 is used in particular in the exhaust system of a motor vehicle and has a housing 12 which has an input 14 and an output 16. Inside the housing 12, a gas-permeable first substrate 18, which is designed as a hollow body, is arranged. Inside the first substrate 18, a second substrate 20 is arranged, which is likewise designed as a hollow body. Both substrates 18, 20 or both hollow bodies have a shape corresponding to the lateral surface of a truncated pyramid with a rectangular, in particular square base area corresponds, and are composed of several, here four flat substrate plates 22 and 24 respectively.
  • the substrate plates 22, 24 are each trapezoidal (see FIG. 2), the substrate plates 24 forming the inner second substrate 20 being smaller than the substrate plates 22 forming the outer first substrate 18.
  • the substrate plates 22, 24 numerous materials come into question. Conceivable here is the use of metal foam or a metallic "sponge" with open pores, metal fibers, metallic hollow balls, wire mesh, wire mesh, expanded metal, ceramic fibers or ceramic foam or a ceramic "sponge".
  • the substrate plates 22, 24 may have a catalytically active coating.
  • the substrate plates 22 and 24 are held by a frame structure 26, which is shown schematically in a slightly modified form in Figure 5 and a plurality of also trapezoidal frame members 28 which are interconnected (see Figure 3).
  • the frame construction 26 or the individual frame elements 28 consist, as can be seen from FIG. 4, of profiles U-shaped in cross-section 30.
  • a respective holder 36 and 38 is provided, which carries the frame structure 26 and thus the substrates 18, 20.
  • Each of the two holders 36 and 38 is formed substantially as a disc with passage openings, wherein the inlet openings of the first holder 36 with 40 and the outlet openings of the second holder 38 are designated 42.
  • the exhaust gas entering the exhaust gas purification device 10 flows via the inlet openings 40 into the annular space 44, which is formed within the first substrate 18 but outside the second substrate 20.
  • Substrate 18, or inwardly, in this case flow through the second substrate 20, and then reached through the outlet openings 42, the output
  • the exhaust gas flow only comes into contact with the comparatively cold housing 12 after it has flowed through the first substrate 18.
  • the portion of the exhaust stream flowing through the second substrate 20 comes not at all with the housing 12 in contact.
  • the substrates 18, 20 can heat up very quickly due to their relatively low thermal mass, while the housing 12 warms up comparatively slowly on the one hand due to its thermal mass and on the other hand due to the unavoidable cooling by the ambient air.
  • the generated exhaust gas can heat the substrates 18, 20 relatively quickly, since it comes into contact with them almost uncooled.
  • the temperature necessary for the regeneration of the substrates 18, 20, for example is reached very quickly in the case of a particle filter.
  • Frame structure 26 and the frame members 28 which have a plurality of fasteners in the form of clips 46 which hold the substrate plates 22 and 24 and are also designed in a U-shaped cross section.
  • each of the substrates 18, 20 and the respective hollow body a plurality of stacked substrate plates 22, 22 ', 22 "or
  • Metal fibers are used as filter material and metal foam or metallic hollow spheres with catalytically active coating as the oxidation catalyst material, in which case the oxidation catalyst material in the flow direction of the
  • FIG. 9 shows a frame construction 26, as used in alternatively configured substrates 18 and 20, which have the shape of the lateral surface of a truncated pyramid with a hexagonal base. Also in this case, the individual substrate plates 22, 24, of which six each form a hollow body here, are trapezoidal, and the substrates 18, 20 and the frame structure 26 are held by the holders 36, 38 in the housing 12.
  • Figures 10 and 11 show two different embodiments for corresponding frame structures 26.
  • the frame members 28 are formed by profiles 48, which form a half hexagon in cross section.
  • Substrate plates 22, 24 set by fasteners in the form of nails or rivets 50 to the angled frame members 28.

Abstract

An exhaust gas purification device (10) for an exhaust gas system, comprises a housing (12), with an inlet (14) and an outlet (16) and a gas permeable substrate (18, 20) in the form of a hollow body, arranged in the flow path (A) from the inlet (14) to the outlet (16), wherein the hollow body is made up of several planar substrate sheets (22, 24).

Description

Abgasreinigungsvorrichtung für eine Abgasanlage Exhaust gas purification device for an exhaust system
Die Erfindung betrifft eine Abgasreinigungsvorrichtung für eine Abgasanlage.The invention relates to an exhaust gas purification device for an exhaust system.
Unter einer Abgasreinigungsvorrichtung im Sinne der Erfindung ist beispielsweise ein Partikelfilter, ein Oxidationskatalysator oder ein NOx- Speicherkatalysator zu verstehen. Eine solche Abgasreinigungsvorrichtung enthält für gewöhnlich ein gasdurchlässiges Substrat, das vom Abgas durchströmt wird, wodurch das Abgas gereinigt wird. Im Fall eines Partikelfilters werden z.B. im Abgas enthaltene Rußpartikel beim Durchströmen des Substrates aus dem Abgas gefiltert. Die verwendeten Substratmaterialien sind meist brüchig und haben eine geringe Biegefestigkeit.For the purposes of the invention, an exhaust gas purification device is to be understood, for example, as a particulate filter, an oxidation catalytic converter or a NO x storage catalytic converter. Such an exhaust gas purification device usually contains a gas-permeable substrate through which the exhaust gas flows, whereby the exhaust gas is purified. In the case of a particulate filter, for example, soot particles contained in the exhaust gas are filtered from the exhaust gas as it flows through the substrate. The substrate materials used are usually brittle and have a low flexural strength.
Die Erfindung schafft eine Abgasreinigungsvorrichtung, die sich durch eine einfache Herstellung auch bei Verwendung brüchiger Substratmaterialien auszeichnet und bei der sich zudem das Substrat im Betrieb rasch aufheizt, um die für den effektiven Betrieb oder auch für eine Regeneration der Abgasreinigungsvorrichtung nötige Temperatur zu erzielen.The invention provides an exhaust gas purification device, which is characterized by a simple production even when using brittle substrate materials and in which moreover the substrate heats up quickly during operation in order to achieve the temperature necessary for effective operation or for regeneration of the exhaust gas purification device.
Erfindungsgemäß ist hierzu eine Abgasreinigungsvorrichtung für eine Abgasanlage vorgesehen, mit einem Gehäuse, das einen Eingang und einen Ausgang aufweist, und einem als Hohlkörper ausgebildeten gasdurchlässigen Substrat, das im Strömungsweg vom Eingang zum Ausgang angeordnet ist, wobei der Hohlkörper aus mehreren flachen Substratplatten zusammengesetzt ist. Dabei steht insbesondere der Innenraum des Hohlkörpers mit dem Eingang in Strömungsverbindung, so daß der Strömungsweg des Abgases vom Eingang durch das Substrat und dann zum Ausgang führt. Dadurch kommt der Abgasstrom nach dem Eintritt in das Gehäuse der Abgasreinigungsvorrichtung zuerst mit dem Substrat in Berührung und erst anschließend mit dem Gehäuse. Auf diese Weise wird zuerst das Substrat aufgeheizt, das als Hohlkörper eine vergleichsweise geringe thermische Masse hat, bevor das Gehäuse dem Abgasstrom eine relativ große Wärmemenge entziehen kann. Da der Hohlkörper aus mehreren flachen (also ebenen) Substratplatten zusammengesetzt ist, läßt er sich auch aus brüchigem Material einfach herstellen und sicher im Gehäuse halten. Ein Biegen des Substratmaterials ist nicht erforderlich, weshalb weder bei der Produktion noch im Betrieb in der Abgasanlage unzulässige Biegespannungen auftreten.According to the invention an exhaust gas purification device for an exhaust system is provided for this purpose, with a housing having an input and an output, and designed as a hollow body gas-permeable substrate which is arranged in the flow path from the input to the output, wherein the hollow body is composed of a plurality of flat substrate plates. In particular, the interior of the hollow body is in flow communication with the inlet, so that the flow path of the exhaust gas from the inlet through the substrate and then leads to the output. As a result, the exhaust gas stream after entering the housing of the exhaust gas purification device first comes into contact with the substrate and only then with the housing. In this way, first the substrate is heated, which has a comparatively low thermal mass as a hollow body, before the housing can withdraw a relatively large amount of heat from the exhaust gas stream. Since the hollow body is composed of a plurality of flat (ie flat) substrate plates, it can be easily made of brittle material and safely in the housing hold. Bending of the substrate material is not required, which is why impermissible bending stresses occur neither during production nor during operation in the exhaust system.
Gemäß einer bevorzugten Ausführungsform der Erfindung ist im Inneren des Substrates ein zweites Substrat angeordnet, das ebenfalls ein aus mehreren flachen Substratplatten zusammengesetzter Hohlkörper ist. Auf diese Weise wird ein zweiter Strömungsweg aus dem Innenraum des ersten Substrates durch das zweite Substrat in dessen Innenraum hinein und von dort zum Ausgang geschaffen. Die Ausgestaltung mit zwei Substraten bietet den Vorteil einer vergrößerten Oberfläche bei gleichzeitig geringem Druckverlust.According to a preferred embodiment of the invention, a second substrate is arranged in the interior of the substrate, which is likewise a hollow body composed of a plurality of flat substrate plates. In this way, a second flow path is created from the interior of the first substrate through the second substrate into its interior and from there to the exit. The embodiment with two substrates offers the advantage of an increased surface area and at the same time low pressure loss.
Der Hohlkörper hat vorzugsweise eine Form, die einer Mantelfläche eines Pyramidenstumpfs entspricht. Bei Verwendung von zwei ineinander angeordneten Hohlkörpern werden diese dann insbesondere in entgegengesetzten Richtungen ineinandergesetzt. Alternativ kann der Hohlkörper natürlich auch als Hohlzylinder, also mit einem über seine gesamte Länge konstantem Plattenabstand, ausgeführt sein.The hollow body preferably has a shape which corresponds to a lateral surface of a truncated pyramid. When using two nested hollow bodies, these are then placed in particular in opposite directions. Alternatively, the hollow body can of course also be designed as a hollow cylinder, that is to say with a plate spacing which is constant over its entire length.
Als besonders einfach herstellbar hat es sich erwiesen, wenn der Pyramidenstumpf eine rechteckige, insbesondere quadratische, oder eine sechseckige Grundfläche hat.It has proved to be particularly easy to produce when the truncated pyramid has a rectangular, in particular square, or hexagonal base.
Die Substratplatten sind bei einer Pyramidenstumpfform des Hohlkörpers insbesondere trapezförmig, wobei im Falle zweier Substrate die Substratplatten des inneren Hohlkörpers kleiner als diejenigen des äußeren Hohlkörpers ausgeführt sind.The substrate plates are in particular a trapezoidal shape in the case of a truncated pyramidal shape of the hollow body, wherein in the case of two substrates, the substrate plates of the inner hollow body are made smaller than those of the outer hollow body.
Zur Befestigung aneinander sowie im Gehäuse werden die Substratplatten bevorzugt durch eine Rahmenkonstruktion gehalten.For attachment to one another and in the housing, the substrate plates are preferably held by a frame construction.
Die Rahmenkonstruktion kann mehrere Befestigungselemente für die Substratplatten aufweisen, bei denen es sich z.B. um Clips, Nägel oder Niete handelt, die die Substratplatten an der Rahmenkonstruktion halten.The frame construction may include a plurality of fastener elements for the substrate plates, which may be e.g. clips, nails or rivets that hold the substrate plates to the frame construction.
Alternativ oder zusätzlich kann die Rahmenkonstruktion aus im Querschnitt U-förmigen Profilen bestehen, in denen die Substratplatten z.B. unmittelbar gehalten sind. Wie bereits erwähnt, werden als Substrate meist brüchige Materialien verwendet. Insbesondere weisen die Substratplatten wenigstens eines der folgenden Materialien auf: Metallschaum, metallische Schwammstruktur, Metallfasern, metallische versinterte Hohlkugeln, Drahtgeflecht, Drahtgestrick, Streckmetall, Keramikfasern und Keramikschaum. All diese Materialien zeichnen sich durch ihre hohe Porosität aus.Alternatively or additionally, the frame construction may consist of cross-sectionally U-shaped profiles in which the substrate plates are held directly, for example. As already mentioned, the substrates used are usually brittle materials. In particular, the substrate plates comprise at least one of the following materials: metal foam, metallic sponge structure, metal fibers, metallic sintered hollow spheres, wire mesh, wire mesh, expanded metal, ceramic fibers and ceramic foam. All these materials are characterized by their high porosity.
Zusätzlich können die Substratplatten mit einer katalytisch aktiven Beschich- tung versehen sein.In addition, the substrate plates can be provided with a catalytically active coating.
Gemäß einer bevorzugten Ausführungsform ist je ein Halter für das stromaufwärtige Ende und für das stromabwärtige Ende des Substrates vorgesehen, der im wesentlichen als ebener Boden bzw. Scheibe mit wenigstens einer Durchtrittsöffnung ausgebildet ist. Auf diese Weise läßt sich das Substrat einfach und sicher im Gehäuse lagern.According to a preferred embodiment, a respective holder for the upstream end and for the downstream end of the substrate is provided, which is formed substantially as a flat bottom or disc with at least one passage opening. In this way, the substrate can be easily and safely stored in the housing.
In einer Weiterbildung der Erfindung weist der Hohlkörper mehrere übereinandergeschichtete Substratplatten aus unterschiedlichen Materialien auf.In one development of the invention, the hollow body has a plurality of stacked substrate plates made of different materials.
Durch gezielte Abstimmung der verwendeten Materialien hinsichtlich ihrer unterschiedlichen spezifischen Reinigungs- bzw. Filtereigenschaften läßt sich so eine besonders gute Reinigungswirkung erzielen.By targeted coordination of the materials used in terms of their different specific cleaning or filter properties can thus achieve a particularly good cleaning effect.
Wie bereits erwähnt, kann die Abgasreinigungsvorrichtung ein Partikelfilter, ein Partikelaufnahmespeicher, ein Oxidationskatalysator oder ein NOx-As already mentioned, the exhaust gas purification device may be a particulate filter, a particulate matter storage, an oxidation catalyst or a NO x -
Speicherkatalysator sein. Natürlich sind auch beliebige Kombinationen dieserBe storage catalyst. Of course, any combinations of these
Komponenten möglich, beispielsweise ist ein Partikelfilter mit integriertemComponents possible, for example, is a particulate filter with integrated
Oxidationskatalysator denkbar.Oxidation catalyst conceivable.
Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung mehrerer bevorzugter Ausführungsformen anhand der beigefügten Zeichnungen. In diesen zeigen:Further features and advantages of the invention will become apparent from the following description of several preferred embodiments with reference to the accompanying drawings. In these show:
- Figur 1 einen Längsschnitt durch eine Abgasreinigungsvorrichtung gemäß einer ersten Ausführungsform der Erfindung;- Figure 1 shows a longitudinal section through an exhaust gas purification device according to a first embodiment of the invention;
- Figur 2 eine Ansicht einer bei der Abgasreinigungsvorrichtung aus Figur 1 verwendeten Substratplatte; - Figur 3 eine Ansicht eines bei der Abgasreinigungsvorrichtung aus Figur 1 verwendeten Rahmenelements;FIG. 2 is a view of a substrate plate used in the exhaust gas purification device of FIG. 1; FIG. 3 is a view of a frame element used in the exhaust gas purification device of FIG. 1;
- Figur 4 einen Schnitt längs der Linie IV-IV in Figur 3, jedoch mit eingesetzter Substratplatte;- Figure 4 is a section along the line IV-IV in Figure 3, but with inserted substrate plate;
- Figur 5 eine schematische Perspektivansicht der Rahmenkonstruktion derFIG. 5 is a schematic perspective view of the frame construction of FIG
Abgasreinigungsvorrichtung aus Figur 1 ;Exhaust gas purification device of Figure 1;
- Figur 6 eine Ansicht eines Rahmenelements gemäß einer alternativen Ausgestaltung;FIG. 6 shows a view of a frame element according to an alternative embodiment;
- Figur 7 einen Schnitt längs der Linie VII-VII in Figur 6, jedoch mit eingesetzter Substratplatte;- Figure 7 is a section along the line VII-VII in Figure 6, but with inserted substrate plate;
- Figur 8 eine Schnittansicht ähnlich Figur 7, jedoch für ein alternativ ausgebildetes Substrat;FIG. 8 is a sectional view similar to FIG. 7, but for an alternatively formed substrate;
- Figur 9 eine schematische Perspektivansicht einer Rahmenkonstruktion mit Haltern für eine Abgasreinigungsvorrichtung gemäß einer zweiten Ausführungs- form der Erfindung;FIG. 9 shows a schematic perspective view of a frame construction with holders for an exhaust gas purification device according to a second embodiment of the invention;
- Figur 10 eine Schnittansicht eines Teils der Rahmenkonstruktion aus Figur 9; undFIG. 10 is a sectional view of part of the frame construction of FIG. 9; and
- Figur 11 eine Schnittansicht einer gegenüber Figur 10 leicht abgewandelten Rahmenkonstruktion.- Figure 11 is a sectional view of a slightly modified compared to Figure 10 frame construction.
Figur 1 zeigt eine Abgasreinigungsvorrichtung 10 gemäß einer erstenFIG. 1 shows an exhaust gas purification device 10 according to a first embodiment
Ausführungsform der Erfindung, bei der es sich um einen Partikelfilter, einen Partikelaufnahmespeicher, einen Oxidationskatalysator, einen NOx-Speicher- katalysator oder eine beliebige Kombination aus den genannten handeln kann. Die Abgasreinigungsvorrichtung 10 wird insbesondere in der Abgasanlage eines Kraftfahrzeugs eingesetzt und weist ein Gehäuse 12 auf, das einen Eingang 14 und einen Ausgang 16 hat. Im Inneren des Gehäuses 12 ist ein als Hohlkörper ausgebildetes, gasdurchlässiges erstes Substrat 18 angeordnet. Im Inneren des ersten Substrates 18 ist ein zweites Substrat 20 angeordnet, das ebenfalls als Hohlkörper ausgebildet ist. Beide Substrate 18, 20 bzw. beide Hohlkörper haben eine Form, die der Mantelfläche eines Pyramidenstumpfes mit rechteckiger, insbesondere quadratischer Grundfläche entspricht, und sind aus mehreren, hier je vier flachen Substratplatten 22 bzw. 24 zusammengesetzt. Die Substratplatten 22, 24 sind jeweils trapezförmig (siehe Figur 2), wobei die das innere zweite Substrat 20 bildenden Substratplatten 24 kleiner als die das äußere erste Substrat 18 bildenden Substratplatten 22 sind.Embodiment of the invention which may be a particulate filter, a particulate trap, an oxidation catalyst, a NO x storage catalyst or any combination thereof. The exhaust gas purification device 10 is used in particular in the exhaust system of a motor vehicle and has a housing 12 which has an input 14 and an output 16. Inside the housing 12, a gas-permeable first substrate 18, which is designed as a hollow body, is arranged. Inside the first substrate 18, a second substrate 20 is arranged, which is likewise designed as a hollow body. Both substrates 18, 20 or both hollow bodies have a shape corresponding to the lateral surface of a truncated pyramid with a rectangular, in particular square base area corresponds, and are composed of several, here four flat substrate plates 22 and 24 respectively. The substrate plates 22, 24 are each trapezoidal (see FIG. 2), the substrate plates 24 forming the inner second substrate 20 being smaller than the substrate plates 22 forming the outer first substrate 18.
Für die Substratplatten 22, 24 kommen zahlreiche Materialien in Frage. Denkbar ist hier die Verwendung von Metallschaum bzw. einer metallischen „Schwammstruktur" mit offenen Poren, Metallfasern, metallischen Hohlkugeln, Drahtgeflecht, Drahtgestrick, Streckmetall, Keramikfasern oder Keramikschaum bzw. einer keramischen „Schwammstruktur". Zusätzlich können die Substratplatten 22, 24 eine katalytisch aktive Beschichtung aufweisen.For the substrate plates 22, 24 numerous materials come into question. Conceivable here is the use of metal foam or a metallic "sponge" with open pores, metal fibers, metallic hollow balls, wire mesh, wire mesh, expanded metal, ceramic fibers or ceramic foam or a ceramic "sponge". In addition, the substrate plates 22, 24 may have a catalytically active coating.
Die Substratplatten 22 bzw. 24 werden durch eine Rahmenkonstruktion 26 gehalten, die schematisch in leicht abgewandelter Form in Figur 5 gezeigt ist und mehrere, ebenfalls trapezförmige Rahmenelemente 28 aufweist, welche miteinander verbunden sind (siehe Figur 3). Die Rahmenkonstruktion 26 bzw. die einzelnen Rahmenelemente 28 bestehen, wie aus Figur 4 hervorgeht, aus im Querschnitt U-förmigen Profilen 30.The substrate plates 22 and 24 are held by a frame structure 26, which is shown schematically in a slightly modified form in Figure 5 and a plurality of also trapezoidal frame members 28 which are interconnected (see Figure 3). The frame construction 26 or the individual frame elements 28 consist, as can be seen from FIG. 4, of profiles U-shaped in cross-section 30.
Sowohl am stromaufwärtigen Ende 32 als auch am stromabwärtigen Ende 34 der Substrate 18, 20 ist jeweils ein Halter 36 bzw. 38 vorgesehen, der die Rahmenkonstruktion 26 und damit die Substrate 18, 20 trägt. Jeder der beiden Halter 36 bzw. 38 ist im wesentlichen als Scheibe mit Durchtrittsöffnungen ausgebildet, wobei die Eintrittsöffnungen des ersten Halters 36 mit 40 und die Austrittsöffnungen des zweiten Halters 38 mit 42 bezeichnet sind.Both at the upstream end 32 and at the downstream end 34 of the substrates 18, 20 a respective holder 36 and 38 is provided, which carries the frame structure 26 and thus the substrates 18, 20. Each of the two holders 36 and 38 is formed substantially as a disc with passage openings, wherein the inlet openings of the first holder 36 with 40 and the outlet openings of the second holder 38 are designated 42.
Das in die Abgasreinigungsvorrichtung 10 gelangende Abgas strömt über die Eintrittsöffnungen 40 in den ringartigen Zwischenraum 44 ein, der innerhalb des ersten Substrates 18, jedoch außerhalb des zweiten Substrates 20 gebildet ist.The exhaust gas entering the exhaust gas purification device 10 flows via the inlet openings 40 into the annular space 44, which is formed within the first substrate 18 but outside the second substrate 20.
Aus diesem sich in Richtung des Strömungswegs A des Abgases verjüngendenFor this tapering in the direction of the flow path A of the exhaust gas
Zwischenraum 44 kann das Abgas entweder nach außen, also durch das ersteInterspace 44, the exhaust either to the outside, ie through the first
Substrat 18, oder nach innen, in diesem Fall durch das zweite Substrat 20 strömen, und erreicht anschließend durch die Austrittsöffnungen 42 den AusgangSubstrate 18, or inwardly, in this case flow through the second substrate 20, and then reached through the outlet openings 42, the output
16. Auf diese Weise kommt der Abgasstrom erst dann mit dem vergleichsweise kalten Gehäuse 12 in Berührung, nachdem er das erste Substrat 18 durchströmt hat. Der durch das zweite Substrat 20 strömende Anteil des Abgasstroms kommt überhaupt nicht mit dem Gehäuse 12 in Berührung. Die Substrate 18, 20 können sich aufgrund ihrer vergleichsweise geringen thermischen Masse sehr schnell aufheizen, während sich das Gehäuse 12 zum einen aufgrund seiner thermischen Masse und zum anderen aufgrund der unvermeidbaren Kühlung durch die Umgebungsluft vergleichsweise langsam aufwärmt. Somit kann, insbesondere nach einem Kaltstart, das erzeugte Abgas die Substrate 18, 20 vergleichsweise schnell erwärmen, da es nahezu ungekühlt mit diesen in Berührung kommt. Dadurch wird beispielsweise bei einem Partikelfilter die für die Regeneration der Substrate 18, 20 notwendige Temperatur sehr schnell erreicht.16. In this way, the exhaust gas flow only comes into contact with the comparatively cold housing 12 after it has flowed through the first substrate 18. The portion of the exhaust stream flowing through the second substrate 20 comes not at all with the housing 12 in contact. The substrates 18, 20 can heat up very quickly due to their relatively low thermal mass, while the housing 12 warms up comparatively slowly on the one hand due to its thermal mass and on the other hand due to the unavoidable cooling by the ambient air. Thus, especially after a cold start, the generated exhaust gas can heat the substrates 18, 20 relatively quickly, since it comes into contact with them almost uncooled. As a result, the temperature necessary for the regeneration of the substrates 18, 20, for example, is reached very quickly in the case of a particle filter.
Die Figuren 6 und 7 zeigen eine alternative Ausgestaltung derFigures 6 and 7 show an alternative embodiment of
Rahmenkonstruktion 26 bzw. der Rahmenelemente 28, die mehrere Befestigungselemente in Form von Clips 46 aufweisen, die die Substratplatten 22 bzw. 24 halten und im Querschnitt ebenfalls U-förmig gestaltet sind.Frame structure 26 and the frame members 28 which have a plurality of fasteners in the form of clips 46 which hold the substrate plates 22 and 24 and are also designed in a U-shaped cross section.
Wie in Figur 8 gezeigt, kann jedes der Substrate 18, 20 bzw. der jeweilige Hohlkörper mehrere übereinandergeschichtete Substratplatten 22, 22', 22" bzw.As shown in Figure 8, each of the substrates 18, 20 and the respective hollow body a plurality of stacked substrate plates 22, 22 ', 22 "or
24, 24', 24" aus unterschiedlichen Materialien aufweisen. Bei einer Kombination aus einem Partikelfilter und einem Oxidationskatalysator können z.B.24, 24 ', 24 "of different materials, for example, in a combination of a particulate filter and an oxidation catalyst, e.g.
Metallfasern als Filtermaterial und Metallschaum bzw. metallische Hohlkugeln mit katalytisch aktiver Beschichtung als Oxidationskatalysatormaterial eingesetzt werden, wobei dann das Oxidationskatalysatormaterial in Strömungsrichtung desMetal fibers are used as filter material and metal foam or metallic hollow spheres with catalytically active coating as the oxidation catalyst material, in which case the oxidation catalyst material in the flow direction of the
Abgases gesehen vor dem Filtermaterial angeordnet ist, also beim erstenViewed exhaust gas is arranged in front of the filter material, ie the first
Substrat 18 auf der Innenseite, beim zweiten Substrat 20 auf der Außenseite desSubstrate 18 on the inside, the second substrate 20 on the outside of the
Hohlkörpers.Hollow body.
Figur 9 zeigt eine Rahmenkonstruktion 26, wie sie bei alternativ ausgestalteten Substraten 18 und 20 eingesetzt wird, die die Form der Mantelfläche eines Pyramidenstumpfs mit sechseckiger Grundfläche haben. Auch in diesem Fall sind die einzelnen Substratplatten 22, 24, von denen hier je sechs einen Hohlkörper bilden, trapezförmig, und die Substrate 18, 20 bzw. die Rahmenkonstruktion 26 werden durch die Halter 36, 38 im Gehäuse 12 gehalten.FIG. 9 shows a frame construction 26, as used in alternatively configured substrates 18 and 20, which have the shape of the lateral surface of a truncated pyramid with a hexagonal base. Also in this case, the individual substrate plates 22, 24, of which six each form a hollow body here, are trapezoidal, and the substrates 18, 20 and the frame structure 26 are held by the holders 36, 38 in the housing 12.
Die Figuren 10 und 11 zeigen zwei unterschiedliche Ausführungen für entsprechende Rahmenkonstruktionen 26. Bei der Ausgestaltung gemäß Figur 10 werden die Rahmenelemente 28 durch Profile 48 gebildet, die im Querschnitt ein halbes Sechseck bilden. Gemäß Figur 11 hingegen ist vorgesehen, die Substratplatten 22, 24 durch Befestigungselemente in Form von Nägeln bzw. Nieten 50 an den abgewinkelten Rahmenelementen 28 festzulegen.Figures 10 and 11 show two different embodiments for corresponding frame structures 26. In the embodiment according to Figure 10, the frame members 28 are formed by profiles 48, which form a half hexagon in cross section. In contrast, according to FIG. 11, it is provided that Substrate plates 22, 24 set by fasteners in the form of nails or rivets 50 to the angled frame members 28.
Darüber hinaus liegt es im Ermessen des Fachmanns, alle beschriebenen Merkmale sowohl einzeln wie auch in Kombination miteinander einzusetzen, um die erfindungsgemäße Aufgabe zu lösen. In addition, it is at the discretion of the skilled person to use all the features described both individually and in combination with each other to achieve the object of the invention.

Claims

Patentansprüche claims
1. Abgasreinigungsvorrichtung für eine Abgasanlage, mit einem Gehäuse (12), das einen Eingang (14) und einen Ausgang (16) aufweist, und einem als Hohlkörper ausgebildeten gasdurchlässigen Substrat (18, 20), das im Strömungsweg (A) vom Eingang (14) zum Ausgang (16) angeordnet ist, wobei der Hohlkörper aus mehreren flachen Substratplatten (22, 24; 22, 22', 22", 24, 24', 24") zusammengesetzt ist.An exhaust gas purification device for an exhaust gas system, comprising a housing (12) having an inlet (14) and an outlet (16) and a gas-permeable substrate (18, 20) formed as a hollow body, which is located in the flow path (A) from the inlet (16). 14) is arranged to the output (16), wherein the hollow body of a plurality of flat substrate plates (22, 24, 22, 22 ', 22 ", 24, 24', 24") is composed.
2. Abgasreinigungsvorrichtung nach Anspruch 1 , dadurch gekennzeichnet, daß im Inneren des Substrates (18) ein zweites Substrat (20) angeordnet ist, das ebenfalls ein aus mehreren flachen Substratplatten (24) zusammengesetzter Hohlkörper ist.2. An exhaust gas purification device according to claim 1, characterized in that in the interior of the substrate (18) a second substrate (20) is arranged, which is also a composite of a plurality of flat substrate plates (24) hollow body.
3. Abgasreinigungsvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Hohlkörper eine Form hat, die einer Mantelfläche eines Pyramidenstumpfs entspricht.3. An exhaust gas purification device according to claim 1 or 2, characterized in that the hollow body has a shape which corresponds to a lateral surface of a truncated pyramid.
4. Abgasreinigungsvorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß der Pyramidenstumpf eine rechteckige, insbesondere quadratische, oder eine sechseckige Grundfläche hat.4. Emission control device according to claim 3, characterized in that the truncated pyramid has a rectangular, in particular square, or a hexagonal base.
5. Abgasreinigungsvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Substratplatten (22, 24; 22, 22', 22", 24, 24", 24") trapezförmig sind.5. An exhaust gas purification device according to one of the preceding claims, characterized in that the substrate plates (22, 24; 22, 22 ', 22 ", 24, 24", 24 ") are trapezoidal.
6. Abgasreinigungsvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Substratplatten (22, 24; 22, 22', 22", 24, 24', 24") durch eine Rahmenkonstruktion (26) gehalten werden.6. Emission control device according to one of the preceding claims, characterized in that the substrate plates (22, 24, 22, 22 ', 22 ", 24, 24', 24") by a frame structure (26) are held.
7. Abgasreinigungsvorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Rahmenkonstruktion (26) mehrere Befestigungselemente für die7. Emission control device according to claim 6, characterized in that the frame construction (26) has a plurality of fastening elements for the
Substratplatten (22, 24; 22, 22', 22", 24, 24', 24") aufweist.Substrate plates (22, 24, 22, 22 ', 22 ", 24, 24', 24").
8. Abgasreinigungsvorrichtung nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß die Rahmenkonstruktion (26) aus im Querschnitt U-förmigen Profilen (30) besteht. 8. An exhaust gas purification device according to claim 6 or 7, characterized in that the frame construction (26) consists of a cross-sectionally U-shaped profiles (30).
9. Abgasreinigungsvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Substratplatten (22, 24; 22, 22', 22", 24, 24", 24") wenigstens eines der folgenden Materialien aufweisen: Metallschaum, metallische Schwammstruktur, Metallfasern, metallische Hohlkugeln,9. The exhaust gas purification device according to one of the preceding claims, characterized in that the substrate plates (22, 24, 22, 22 ', 22 ", 24, 24", 24 ") comprise at least one of the following materials: metal foam, metallic sponge structure, metal fibers, metallic hollow spheres,
5 Drahtgeflecht, Drahtgestrick, Streckmetall, Keramikfasern und Keramikschaum.5 wire mesh, wire mesh, expanded metal, ceramic fibers and ceramic foam.
10. Abgasreinigungsvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Substratplatten (22, 24; 22, 22', 22", 24, 24', 24") eine katalytisch aktive Beschichtung aufweisen.10. Exhaust gas purification device according to one of the preceding claims, characterized in that the substrate plates (22, 24, 22, 22 ', 22 ", 24, 24', 24") have a catalytically active coating.
11. Abgasreinigungsvorrichtung nach einem der vorhergehenden Ansprüche, 10. dadurch gekennzeichnet, daß je ein Halter (36, 38) für das stromaufwärtige Ende11. Emission control device according to one of the preceding claims, 10, characterized in that a respective holder (36, 38) for the upstream end
(32) und für das stromabwärtige Ende (34) des Substrates (18, 20) vorgesehen ist, der im wesentlichen als Scheibe mit wenigstens einer Durchtrittsöffnung ausgebildet ist.(32) and for the downstream end (34) of the substrate (18, 20) is provided, which is formed substantially as a disc with at least one passage opening.
12. Abgasreinigungsvorrichtung nach einem der vorhergehenden Ansprüche, 15 dadurch gekennzeichnet, daß der Hohlkörper mehrere übereinandergeschichtete12. An exhaust gas purification device according to any one of the preceding claims, 15, characterized in that the hollow body has a plurality of stacked
Substratplatten (22, 22', 22", 24, 24', 24") aus unterschiedlichen Materialien aufweist.Substrate plates (22, 22 ', 22 ", 24, 24', 24") made of different materials.
13. Abgasreinigungsvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß sie einen Partikelfilter, einen Partikelaufnahme- 0 Speicher, einen Oxidationskatalysator und/oder einen NOx-Speicherkatalysator umfaßt. 13. An exhaust gas purification device according to any one of the preceding claims, characterized in that it comprises a particulate filter, a Partikelaufnahme- 0 memory, an oxidation catalyst and / or a NO x storage catalytic converter.
EP08735376A 2007-04-27 2008-04-24 Exhaust gas purification device for an exhaust gas system Withdrawn EP2153033A1 (en)

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DE102007020003A DE102007020003A1 (en) 2007-04-27 2007-04-27 Exhaust gas purification device for an exhaust system
PCT/EP2008/003307 WO2008135175A1 (en) 2007-04-27 2008-04-24 Exhaust gas purification device for an exhaust gas system

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KR20090130423A (en) 2009-12-23

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