DE19938038A1 - Exhaust gas treatment device with varying cell density - Google Patents
Exhaust gas treatment device with varying cell densityInfo
- Publication number
- DE19938038A1 DE19938038A1 DE19938038A DE19938038A DE19938038A1 DE 19938038 A1 DE19938038 A1 DE 19938038A1 DE 19938038 A DE19938038 A DE 19938038A DE 19938038 A DE19938038 A DE 19938038A DE 19938038 A1 DE19938038 A1 DE 19938038A1
- Authority
- DE
- Germany
- Prior art keywords
- exhaust gas
- treatment device
- cells
- substrate
- section
- 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.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
- B01D53/9454—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/88—Handling or mounting catalysts
- B01D53/885—Devices in general for catalytic purification of waste gases
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- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series
- F01N13/0097—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
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- 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
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0842—Nitrogen oxides
-
- 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
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
- F01N3/2825—Ceramics
- F01N3/2828—Ceramic multi-channel monoliths, e.g. honeycombs
-
- 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
- F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Toxicology (AREA)
- Ceramic Engineering (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Exhaust Gas After Treatment (AREA)
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Die Erfindung betrifft eine Abgasbehandlungsvorrichtung für Kraftfahrzeuge mit einem aktiven Abschnitt, einem Substrat variierender Zelldichte 20, wobei die Dichten der Zellgruppen (20A, 20B, 20C) so angeordnet sind, daß ein gleichmäßiger Fluß durch das gesamte Substrat (20, 22) gefördert wird.The invention relates to an exhaust gas treatment device for motor vehicles with an active section, a substrate of varying cell density 20, the densities of the cell groups (20A, 20B, 20C) being arranged in such a way that a uniform flow through the entire substrate (20, 22) is promoted.
Description
Die Erfindung betrifft eine Abgasbehandlungsvorrichtung für Kraftfahrzeuge. Sie be zieht sich also auf die Behandlung von Automobilabgasen, um verschiedene gesteuerte Emissionskomponenten zu entfernen.The invention relates to an exhaust gas treatment device for motor vehicles. You be therefore extends to the treatment of automobile exhaust to various to remove controlled emission components.
Automobilabgas-Emissionssteuerungsgesetze werden immer strenger, wobei die Kraftfahrzeughersteller versuchen, die Wirksamkeit von Abgasemissionssteuerungskonvertern zu verbessern. In dieser Anmeldung wird die Bezeichnung "Konverter" für einen konventionellen oxidierenden Katalysator (COC), einen Dreiwegekatalysator (TWC), eine NOx-Falle, einen thermischen Reaktor oder einen anderen Typ Vorrichtungen venrvendet, die allgemein axiale Flußpassagen in einem extrudierten Keramikmonolithen oder einer anderen Konstruktion besitzen.Automobile exhaust emissions control laws are getting stricter, the car manufacturers are trying to test the effectiveness of To improve exhaust emission control converters. In this registration is the term "converter" for a conventional oxidizing Catalyst (COC), a three-way catalyst (TWC), a NOx trap, a thermal reactor or other type of device used, the generally axial flow passages in an extruded Have ceramic monoliths or other construction.
Erfindungsgemäß ist bestimmt worden, daß die Flußcharakteristika durch konventionell hergestellte keramische Monolithen keinen effizienten Betrieb eines Katalysators fördern, da Flußfehlleitung in vielen Konvertern auftritt: Beispielsweise besitzt ein Konverter nach dem Stand der Technik, wie in Fig. 5 dargestellt, eine einheitliche Zelldichte (s. Fig. 4) von etwa 62 Zellen/cm2 (400 Zellen/inch2), wobei die Flußfehlleitung wie in Fig. 6 und 7 dargestellt, auftritt. Fig. 6 zeigt eine Seitenansicht des Konverters der Fig. 5 und zeigt, daß der Hauptfluß im unteren Bereich des Substrats stattfindet; Fig. 7 zeigt, daß der Hauptfluß ferner auf die Außenkanten des Substrats begrenzt ist, wobei lediglich ein geringer Teil des Flusses durch den Mittelabschnitt des Substrats verläuft. Demzufolge wird ein großer Anteil des Substrats nicht ausreichend genutzt. Der in den Fig. 6 und 7 dargestellte Fluß stammt teilweise aus der 90°-Biegung, die die Gase beim Eintritt in den Konverter der Fig. 5 durchlaufen. According to the invention, it has been determined that the flow characteristics through conventionally produced ceramic monoliths do not promote efficient operation of a catalyst, since flow misdirection occurs in many converters: for example, a converter according to the prior art, as shown in FIG. 5, has a uniform cell density (see FIG . Fig. 4) of about 62 cells / cm 2 (400 cells / inch 2 ), where the flow misdirection occurs as shown in Figs. 6 and 7. Fig. 6 shows a side view of the converter of Fig. 5 and shows that the main flow takes place in the lower region of the substrate; Fig. 7 shows that the main flow is further limited to the outer edges of the substrate, with only a small part of the flow passing through the central portion of the substrate. As a result, a large proportion of the substrate is not used sufficiently. The flow shown in FIGS. 6 and 7 partly comes from the 90 ° bend through which the gases pass when entering the converter of FIG. 5.
Falls der Konverter einen geraden Flußeintritt aufweist, wie in Fig. 8 und 9 gezeigt, treten ähnliche Resultate auf. Die Höchstfließgeschwindigkeiten treten im Zentrum auf und fallen zu den Seiten ab. So tritt wieder eine Fehl leitung des Flusses durch den Konverter auf.If the converter has a straight flow entry, as shown in Figs. 8 and 9, similar results will occur. The maximum flow speeds occur in the center and drop to the sides. This leads to a misdirection of the flow through the converter.
Es ist demzufolge Aufgabe der Erfindung, einen verbesserten Konverter zu schaffen, der die Nachteile der Vorrichtungen nach dem Stand der Technik vermeidet.It is therefore an object of the invention to provide an improved converter create the disadvantages of the devices according to the prior art avoids.
Die Aufgabe wird erfindungsgemäß durch eine Abgasbehandlungsvorrichtung mit den Merkmalen des Patentanspruches 1 gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.According to the invention, the object is achieved by an exhaust gas treatment device solved with the features of claim 1. Advantageous further training result from the subclaims.
Ein erfindungsgemäß konstruierter Konverter löst die oben genannten Probleme, indem eine gleichmäßigere Ausnutzung des katalytischen Materials durch den Abgasfluß erzielt wird, um die Konversionseffizienz zu erhöhen, während sich der Abgassystemrückdruck erniedrigt, wodurch ein besseres Fahrzeugverhalten unterstützt wird.A converter constructed according to the invention solves the above Problems by making more even use of the catalytic Material is achieved through the exhaust flow to increase conversion efficiency increase while the exhaust system back pressure decreases, causing a better vehicle behavior is supported.
Eine erfindungsgemäße Abgasbehandlungsvorrichtung umfaßt ein Einlaß rohr sowie einen Diffuserabschnitt, um Abgas vom Motor zum aktiven Ab schnitt der Behandlungsvorrichtung zu führen und einen Auslaßabschnitt, um behandeltes Abgas aus dem aktiven Abschnitt der Behandlungsvorrich tung zum stromabwärts gelegenen Abschnitt eines Abgassystems zu führen.An exhaust gas treatment device according to the invention comprises an inlet tube and a diffuser section to exhaust gas from the engine to the active exhaust cut the treatment device and an outlet section, to treated exhaust gas from the active section of the treatment device lead to the downstream section of an exhaust system.
Ein aktiver Abschnitt umfaßt ein zellvariantes Substrat mit darauf abge schiedenem aktiven "Washcoat", das mehrere parallele Flußpfade aufweist, wobei die Pfade mindestens eine erste Gruppe Zellen mit einer höheren Dichte und eine zweite Gruppe Zellen mit einer niedrigeren Dichte aufweist. An active section comprises a cell-variant substrate with abge thereon different active "washcoat", which has several parallel flow paths, wherein the paths are at least a first group of cells with a higher one Density and a second group of cells having a lower density.
Die ersten und zweiten Zellgruppen sind im Substrat so angeordnet, daß die erste Gruppe Zellen höherer Dichte dem Abgas, das mit relativ höherer Ge schwindigkeit fließt, ausgesetzt sind, während die zweite Gruppe Zellen niedrigerer Dichte Abgas mit relativ niedrigerer Geschwindigkeit ausgesetzt ist.The first and second cell groups are arranged in the substrate so that the first group cells of higher density the exhaust gas, the relatively higher Ge speed flows, are exposed while the second group cells lower density exhaust gas exposed at relatively lower speed is.
Eine erfindungsgemäße Abgasbehandlungsvorrichtung kann ferner einen aktiven Abschnitt mit einem zellvarianten Substrat variabler Zelldichte auf weisen, gefolgt durch ein zweites Substrat mit invarianter Zelldichte.An exhaust gas treatment device according to the invention can also be a active section with a cell-variant substrate of variable cell density point, followed by a second substrate with invariant cell density.
Es ist ein Vorteil der Erfindung, daß eine erfindungsgemäße Abgasbehand lungsvorrichtung überlegenen Behandlungsfähigkeiten aufgrund der Anpas sung der Abgasfließgeschwindigkeiten an die Zelldichte schafft, während ein niedrigerer Abgassystemrückdruck ermöglicht wird.It is an advantage of the invention that an exhaust gas treatment according to the invention device superior treatment skills due to the adjustment solution of exhaust gas flow velocities to cell density while a lower exhaust system back pressure is made possible.
Es ist ein weiterer Vorteil der Erfindung, daß ein erfindungsgemäß herge stellter Abagskonverter in ein Gehäuse geringeren Volumens aufgrund er höhter Effizienz gepackt werden kann.It is a further advantage of the invention that a herge according to the invention Abag converter placed in a housing of smaller volume due to it can be packed with greater efficiency.
Es ist ein weiterer Vorteil der Erfindung, daß die erfindungsgemäß konstru ierte Vorrichtung mit weniger Edelmetallbeladung bei niedrigeren Kosten hergestellt werden kann.It is a further advantage of the invention that the construct according to the invention ized device with less precious metal loading at lower costs can be manufactured.
Weitere Vorteile, Merkmale und Ziele der Erfindung ergeben sich dem Fach mann aus der nachfolgenden Beschreibung, in der die Erfindung anhand be vorzugter Ausführungsbeispiele, auf die sie keinesfalls begrenzt ist, erläutert wird. Darin zeigt:Other advantages, features and objectives of the invention will become apparent to those skilled in the art man from the following description in which the invention based on be preferred embodiments, to which it is by no means limited becomes. It shows:
Fig. 1 eine erfindungsgemäße Abgasbehandlungsvorrichtung; FIG. 1 is an exhaust gas treatment apparatus of the invention;
Fig. 2 eine Ausführungsform einer zellvarianten mololithischen Substratstruktur gemäß Erfindung; FIG. 2 shows an embodiment of a cell variants mololithischen substrate structure according to the invention;
Fig. 3 eine zweite Ausführungsform der Erfindung mit einem zellvarianten mololithischen Substrat;3 shows a second embodiment of the invention with a cell variants mololithischen substrate.
Fig. 4 ein zellinvariantes mololithisches Substrat gemäß dem Stand der Technik. Fig. 4 is a zellinvariantes mololithisches substrate according to the prior art.
Fig. 5 eine Abgasbehandlungsvorrichtung nach dem Stand der Technik mit einem zellinvarianten ersten aktiven Abschnitt; Figure 5 is an exhaust gas treatment apparatus according to the prior art with a zellinvarianten first active portion.
Fig. 6 und 7 Fließmuster innerhalb der Vorrichtung nach dem Stand der Technik der Fig. 5; Figures 6 and 7 flow patterns within the prior art device of Figure 5;
Fig. 8 und 9 Fließmuster durch eine Vorrichtung nach dem Stand der Technik ähnlich der Fig. 5, die jedoch einen geraden Einlaß anstelle eines gebogenen Einlasses aufweist; und Figures 8 and 9 flow patterns through a prior art device similar to Figure 5 but having a straight inlet instead of a curved inlet; and
Fig. 10 und 11 erläutern den Fluß durch einen gemäß Fig. 1 konstruierten Konverter. FIGS. 10 and 11 illustrate the flow through a in FIG. 1 constructed converter.
Wie in Fig. 1 gezeigt, besitzt eine Abgasbehandlungsvorrichtung gemäß der Erfindung ein Einlaßrohr 12, gefolgt durch einen Diffuser 14. Nach Fluß durch den Diffuser 14 passiert Abgas das zellvariante Substrat 20 mit dem chemisch aktiven Washcoat darauf. Substrat 20 ist mit drei Zellgruppen mit unterschiedlichen Dichten dargestellt; wie speziell in Fig. 2 gezeigt, ist eine erste Gruppe mit höchster Dichte in der Nähe des Zentrums der Substrats 22 angeordnet. Diese Gruppe, die als 20A bezeichnet wird, besitzt eine Dichte von etwa 93 Zellen/cm2 (600 Zellen/inch2). Unmittelbar umgibt diese die Gruppe 20B mit einer Dichte von etwa 62 Zellen/cm2 (400 Zellen/inch2). As shown in FIG. 1, an exhaust gas treatment device according to the invention has an inlet pipe 12 , followed by a diffuser 14 . After flowing through the diffuser 14 , exhaust gas passes through the cell-variant substrate 20 with the chemically active washcoat thereon. Substrate 20 is shown with three cell groups with different densities; As specifically shown in FIG. 2, a first highest density group is located near the center of the substrate 22 . This group, designated 20 A, has a density of about 93 cells / cm 2 (600 cells / inch 2 ). This immediately surrounds group 20 B with a density of approximately 62 cells / cm 2 (400 cells / inch 2 ).
Schließlich besitzt die Gruppe 20C, die den Rest des Substrats 20 bildet, eine Dichte von etwa 31 Zellen/cm2 (200 Zellen/Inch2).Finally, the group has 20 carbon that forms the remainder of the substrate 20, a density of about 31 cells / cm 2 (200 cells / inch 2).
Das Substrat 20 wird vom Substrat 22 mit invarianter Zellenkonstruktion gefolgt. Es ist bestimmt worden, daß der Fluß durch das erste Substrat 20 sich begradigt und den Fluß ausreichend ausgleicht, so daß im Substrat 22 keine zellvariante Konstruktion benötigt wird. Die Wirkung der zellvarianten Konstruktion des Substrats 20 ist in den Fig. 10 und 11 dargestellt. Wie aus diesen Figur ersichtlich, ist der resultierende Fluß konsistenter über das Substrat als die Flüsse durch die Substrate nach dem Stand der Technik, die in den Fig. 6 und 7 dargestellt sind. Derart ist die Abgasbehand lungsfähigkeit verbessert, da der Fluß durch verschiedene Abschnitte des Katalysators konsistenter ist. Ferner kann der Abgassystemrückdruck da durch reduziert werden, indem, die Dichte sich bis zu einem Punkt erniedri gen kann, an dem eine akzeptable Konversion erreicht wird, aber bei niedri gerem Flußwiderstand.The substrate 20 is followed by the substrate 22 with an invariant cell construction. It has been determined that the flow through the first substrate 20 straightens and balances the flow sufficiently so that no cell-variant construction is required in the substrate 22 . The effect of the cell-variant construction of the substrate 20 is shown in FIGS . 10 and 11. As can be seen from these figures, the resulting flow across the substrate is more consistent than the flows through the prior art substrates shown in Figures 6 and 7. Thus, the exhaust gas treatment ability is improved because the flow through different sections of the catalyst is more consistent. Furthermore, the exhaust system back pressure can be reduced by reducing the density to a point where an acceptable conversion is achieved, but with lower flow resistance.
Fig. 3 zeigt ein Beispiel eines zellvarianten Substrats gemäß der Endung zu Einsatz mit einer Abgasbehandlungsvorrichtung ohne die 90°-Einlaß krümmung, wie in Fig. 1 gezeigt. Bemerkenswerterweise sind die Zonen von 93, 62 und 31 Zellen/cm2 stärker um das geometrische Zentrum des Substrats zentriert. Fig. 3 shows an example of a cell-variant substrate according to the ending for use with an exhaust gas treatment device without the 90 ° inlet curvature, as shown in Fig. 1. Remarkably, the zones of 93, 62 and 31 cells / cm 2 are more centered around the geometric center of the substrate.
Obwohl die Erfindung anhand bevorzugter Ausführungsbeispiele beschrie
ben gezeigt wurde, ist es dem Fachmann offensichtlich, daß mannigfaltige
Abwandlungen und Modifikationen möglich sind, ohne sich dem Schutzum
fang der Ansprüche zu entfernen.
12 Einlaßrohr
14 Diffuser
20 zellvariantes Substrat (erstes Substrat)
20A 93 Zellen/cm2
20B 62 Zellen/cm2
20C 31 Zellen/cm2
22 Substrat, nicht zellvariant (zweites Substrat)
24 geometrisches Zentrum von 22
Although the invention has been described using preferred exemplary embodiments, it is obvious to the person skilled in the art that various modifications and modifications are possible without removing the scope of protection of the claims. 12 inlet pipe
14 diffuser
20 cell-variant substrate (first substrate)
20 A 93 cells / cm 2
20 B 62 cells / cm 2
20 C 31 cells / cm 2
22 substrate, non-cell variant (second substrate)
24 geometric center of 22
Claims (13)
einem Einlaßrohr (12) und Diffuserabschnitt (14), um Abgas vom Motor zu einem aktiven Abschnitt der Behandlungsvorrichtung zu führen;
einem Austrittsabschnitt, um behandeltes Abgases vom aktiven Abschnitt der Behandlungsvorrichtung zum stromabwärtigen Abschnitt des Abgassystems zu führen; und
einem aktiven Abschnitt mit einem Substrat (20) mit darauf abgeschiedenem aktivem Washcoat, das mehrere parallele Flußwege aufweist, von denen min destens eine erste Zeligruppe eine höhere Dichte (20A) und eine zweite Zeligruppe (20C) eine niedrigere Dichte aufweisen.1. Exhaust gas treatment device for motor vehicles, with:
an inlet pipe ( 12 ) and diffuser section ( 14 ) for directing exhaust gas from the engine to an active section of the treatment device;
an exit section for directing treated exhaust gas from the active section of the treatment device to the downstream section of the exhaust system; and
an active section with a substrate ( 20 ) with an active washcoat deposited thereon, which has a plurality of parallel flow paths, of which at least a first cell group has a higher density ( 20 A) and a second cell group ( 20 C) has a lower density.
einem Einlaßrohr (12), einem Diffuserabschnitt (14), um Abgas von einem Motor zu einem aktiven Abschnitt der Behandlungsvorrichtung zu führen;
einem Austrittsabschnitt um behandeltes Abgas vom aktiven Abschnitt der Behandlungsvorrichtung zum stromabwärtigen Abschnitt des Abgassystems zu führen; und
einem aktiven Abschnitt mit einem Substrat (20) mit mehreren parallelen Flußwegen, wobei die Flußwege eine erste Zellgruppe mit einer Dichte von mindestens 62 Zellen/cm2 und eine zweite Gruppe Zellen mit einer Dichte von etwa 31 Zellen/cm2 aufweisen, wobei die erste Gruppe Zellen so angeordnet ist, daß sie einen Abgasfluß mit einer höheren Geschwindigkeit empfängt und die zweite Gruppe Zellen so angeordnet sind, daß sie einen Abgasfluß mit niedrigerer Geschwindigkeit empfängt.8. Exhaust gas treatment device for a motor vehicle, comprising:
an inlet pipe ( 12 ), a diffuser section ( 14 ) for leading exhaust gas from an engine to an active section of the treatment device;
an exit section for directing treated exhaust gas from the active section of the treatment device to the downstream section of the exhaust system; and
an active portion having a substrate ( 20 ) with a plurality of parallel flow paths, the flow paths comprising a first group of cells with a density of at least 62 cells / cm 2 and a second group of cells with a density of approximately 31 cells / cm 2 , the first The group of cells is arranged to receive an exhaust gas flow at a higher speed and the second group of cells is arranged to receive an exhaust gas flow at a lower speed.
einem Einlaßrohr (12) und einem Diffuserabschnitt, (14) um Abgas von einem Motor zu einem aktiven Abschnitt der Behandlungsvorrichtung zu führen;
einen Austrittsabschnitt um Abgas von einem Motor zu einem aktiven Abschnitt der Behandlungsvorrichtung zu führen;
einen Austrittsabschnitt, um behandeltes Abgas vom aktiven Abschnitt der Behandlungsvorrichtung zum stromabwärtigen Abschnitt eines Abgassystems zu leiten; und
einen aktiven Abschnitt mit einem zellvarianten Substrat (20), das mehrere sich axial erstreckende parallele Flußwege aufweist, wobei die Flußwege eine erste Zellgtruppe mit einer Dichte von etwa 93 Zellen/cm2, eine zweite Gruppe Zellen mit einer Dichte von etwa 62 Zellen/cm2 und eine dritte Gruppe Zellen mit einer Dichte von etwa 31 Zellen/cm2 aufweist, wobei die erste Zellgruppe so angeordnet ist, daß sie Abgas mit einer höheren Geschwindigkeit empfängt und die zweiten und dritten Gruppen Zellen so angeordnet sind, daß sie Abgas mit progressiv niedrigeren Geschwindigkeiten auffangen.11. Exhaust gas treatment device for a motor vehicle, comprising:
an inlet pipe ( 12 ) and a diffuser section ( 14 ) for leading exhaust gas from an engine to an active section of the treatment device;
an exhaust section to guide exhaust gas from an engine to an active section of the treatment device;
an exit portion for directing treated exhaust gas from the active portion of the treatment device to the downstream portion of an exhaust system; and
an active section with a cell-variant substrate ( 20 ), which has a plurality of axially extending parallel flow paths, the flow paths comprising a first group of cells with a density of approximately 93 cells / cm 2 , a second group of cells with a density of approximately 62 cells / cm 2 and a third group of cells having a density of approximately 31 cells / cm 2 , the first group of cells being arranged to receive exhaust gas at a higher speed and the second and third grouping cells being arranged to receive exhaust gas with progressive field at lower speeds.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15238798A | 1998-09-14 | 1998-09-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE19938038A1 true DE19938038A1 (en) | 2000-05-04 |
Family
ID=22542706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19938038A Withdrawn DE19938038A1 (en) | 1998-09-14 | 1999-08-12 | Exhaust gas treatment device with varying cell density |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2000097019A (en) |
| DE (1) | DE19938038A1 (en) |
| GB (1) | GB2342055A (en) |
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| JPH10244167A (en) * | 1997-03-06 | 1998-09-14 | Hino Motors Ltd | Catalyst structure body for purifying exhaust gas |
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1999
- 1999-08-12 DE DE19938038A patent/DE19938038A1/en not_active Withdrawn
- 1999-09-07 GB GB9920972A patent/GB2342055A/en not_active Withdrawn
- 1999-09-09 JP JP11255528A patent/JP2000097019A/en active Pending
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| DE10223736A1 (en) * | 2002-05-28 | 2003-12-11 | Man Nutzfahrzeuge Ag | Device for reducing soot particles contained in the exhaust gas of a vehicle diesel engine |
| WO2007009139A1 (en) | 2005-07-19 | 2007-01-25 | Avl List Gmbh | Exhaust gas line of an internal combustion engine |
| US8555627B2 (en) | 2005-07-19 | 2013-10-15 | Avl List Gmbh | Exhaust gas line of an internal combustion engine |
| AT500737B1 (en) * | 2005-12-06 | 2008-06-15 | Avl List Gmbh | Spark-ignition internal combustion engine for vehicle, has water injection device injecting water into exhaust gas line, where injection device opens upstream of upstream of turbine of turbocharger into exhaust gas line |
| AT501337B1 (en) * | 2006-04-20 | 2008-11-15 | Avl List Gmbh | EXHAUST GAS OF AN INTERNAL COMBUSTION ENGINE |
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| US10632709B2 (en) | 2016-03-17 | 2020-04-28 | Ngk Insulators, Ltd. | Honeycomb structure |
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| US10605140B2 (en) | 2016-08-16 | 2020-03-31 | Continental Automotive Gmbh | Honeycomb body for exhaust gas aftertreatment |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000097019A (en) | 2000-04-04 |
| GB2342055A (en) | 2000-04-05 |
| GB9920972D0 (en) | 1999-11-10 |
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| OP8 | Request for examination as to paragraph 44 patent law | ||
| 8139 | Disposal/non-payment of the annual fee |