DE10044893A1 - Soot filter for continuous regeneration trap of diesel exhaust purification system, includes internal longitudinal bypass - Google Patents

Soot filter for continuous regeneration trap of diesel exhaust purification system, includes internal longitudinal bypass

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Publication number
DE10044893A1
DE10044893A1 DE10044893A DE10044893A DE10044893A1 DE 10044893 A1 DE10044893 A1 DE 10044893A1 DE 10044893 A DE10044893 A DE 10044893A DE 10044893 A DE10044893 A DE 10044893A DE 10044893 A1 DE10044893 A1 DE 10044893A1
Authority
DE
Germany
Prior art keywords
bypass
particle filter
filter
particle
exhaust gas
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Withdrawn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
DE10044893A
Other languages
German (de)
Inventor
Gerhard Kahmann
Andreas Ruhnke
Thorsten Duesterdiek
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
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 Volkswagen AG filed Critical Volkswagen AG
Priority to DE10044893A priority Critical patent/DE10044893A1/en
Publication of DE10044893A1 publication Critical patent/DE10044893A1/en
Withdrawn legal-status Critical Current

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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
    • F01N3/031—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 having means for by-passing filters, e.g. when clogged or during cold engine start
    • 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 ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • 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 ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • 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
    • F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/0231—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 using means for regenerating the filters, e.g. by burning trapped particles using special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
    • 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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • 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
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/06—Ceramic, e.g. monoliths
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/16—Chambers with particular shapes, e.g. spherical

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

A bypass (6) extends longitudinally through the particle filter interior. Preferred Features: The bypass opening (7) is located in the front end face (2) of the particle filter. Particle-contaminated exhaust gas (3) does not flow directly to this location under normal conditions. The filter body is a honeycomb or monolith. Its channels are closed in alternation. It is a ceramic monolith, in which the bypass is formed by a number of channels, which are not closed. The filter may be formed by segments, one of which does not have closed channels. The inlet opening (7) of the bypass (6) represents 1-5% of the total inlet area to the filter.

Description

Die Erfindung betrifft einen Partikelfilter für eine Dieselbrennkraftmaschine gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a particle filter for a diesel internal combustion engine according to the Preamble of claim 1.

Dieselbrennkraftmaschinen erzeugen während ihres Betriebs aufgrund der Verbrennung Partikel, vorzugsweise Rußpartikel, die im Abgas von der Dieselbrennkraftmaschine ausgestoßen werden. Um ein Freisetzen dieser Partikel in die Umwelt zu vermeiden, wird im Abgasstrom einer Dieselbrennkraftmaschine mindestens ein Partikelfilter angeordnet, der die Rußpartikel aus dem Abgasstrom herausfiltert. Aufgrund der endlichen Aufnahmekapazität eines Partikelfilters muß dieser regeneriert werden, was im allgemeinen durch eine Oxidation der Rußpartikel, das heißt durch einen Abbrand, bewirkt wird.Diesel engines generate during their operation due to combustion Particles, preferably soot particles, in the exhaust gas from the diesel engine be expelled. To avoid releasing these particles into the environment, at least one particle filter arranged in the exhaust gas stream of a diesel internal combustion engine, which filters out the soot particles from the exhaust gas flow. Because of the finite Absorbing capacity of a particle filter must be regenerated, which in the generally by oxidation of the soot particles, i.e. by burning, is effected.

Es sind nun zweierlei Regenerationsarten möglich. Einerseits kann der Partikelfilter in Intervallen, das heißt von Zeit zu Zeit nach Bedarf, regeneriert werden, indem beispielsweise als Funktion des Füllungsgrades des Partikelfilters ein Abbrand der Partikel initiiert wird. Dazu muß die Temperatur im Partikelfilter auf höher als die Entzündtemperatur der Rußpartikel von ca. 550°C angehoben werden. Dies kann beispielsweise durch geeignete Motorsteuermaßnahmen, die eine Erhöhung der Abgastemperaturen bewirken, erzielt werden. Eine andere Möglichkeit ist die Verwendung einer Heizung, vorzugsweise einer elektrischen Heizung, in dem Partikelfilter, die einen Abbrand der angesammelten Rußpartikel bewirkt. Um den Abbrand der Partikel zu erleichtern, ist ferner vorgeschlagen worden, dem Kraftstoff ein entsprechendes Additiv zuzusetzen, das eine Herabsetzung der Zündtemperatur der Rußpartikel bewirkt.Two types of regeneration are now possible. On the one hand, the particle filter in Intervals, i.e. from time to time as required, are regenerated by for example, as a function of the degree of filling of the particle filter Particle is initiated. To do this, the temperature in the particle filter must be higher than that Ignition temperature of the soot particles can be raised from approx. 550 ° C. This can for example, by means of suitable engine control measures that increase the Exhaust gas temperatures can be achieved. Another option is Use of a heater, preferably an electric heater, in the Particle filter, which burns off the soot particles that have accumulated. To the To facilitate burnup of the particles, it has also been suggested to use the fuel add appropriate additive that reduces the ignition temperature of the Soot particle causes.

Andererseits ist es möglich, einen sogenannten kontinuierlichen Abbrand der Rußpartikel im Partikelfilter zu bewirken. Derartige Systeme werden als CRT-Systeme (CRT = Continuous Regeneration Trap) bezeichnet. Im allgemeinen umfassen CRT- Systeme neben dem Partikelfilter einen diesem vorgeschalteten Oxidationskatalysator, der die von der Dieselbrennkraftmaschine erzeugten Stickoxide NOx zu NO2 aufoxidiert, wobei das in den Partikelfilter gelangende Stickstoffdioxid NO2 zur Verbrennung der Rußpartikel zu Kohlendioxid CO2 verwendet wird. Dabei müssen bestimmte Randbedingungen, nämlich eine Abgastemperatur von höher als 300°C und ein Massenverhältnis von NO2 zu Partikel von größer als 8 eingehalten werden. Bei Abweichungen von diesen Randbedingungen muß der Partikelfilter des CRT-Systems durch eine entsprechende Maßnahme, beispielsweise Erhöhen der Temperatur bei gleichzeitigem Sauerstoffüberangebot, zwangsregeneriert werden, da er sonst aufgrund des Zusetzen mit Rußpartikeln blockiert.On the other hand, it is possible to cause the soot particles to burn off continuously in the particle filter. Such systems are referred to as CRT systems (CRT = Continuous Regeneration Trap). In addition to the particle filter, CRT systems generally include an oxidation catalytic converter connected upstream of this, which oxidizes the nitrogen oxides NOx generated by the diesel internal combustion engine to NO 2 , the nitrogen dioxide NO 2 entering the particle filter being used to burn the soot particles to form carbon dioxide CO 2 . Certain boundary conditions, namely an exhaust gas temperature of more than 300 ° C. and a mass ratio of NO 2 to particles of more than 8, must be observed. In the event of deviations from these boundary conditions, the particle filter of the CRT system must be positively regenerated by an appropriate measure, for example increasing the temperature with simultaneous excess of oxygen, since it would otherwise block due to clogging with soot particles.

Bei einer Zwangsregeneration des Partikelfilters, beispielsweise bei den diskontinuierlichen Verfahren, wird während der Regeneration das Abgas zur Vermeidung einer Überhitzung des Partikelfilters um den Partikelfilter durch einen Bypass geführt.In the case of a forced regeneration of the particle filter, for example in the discontinuous process, the exhaust gas becomes during regeneration Avoidance of overheating of the particle filter around the particle filter Bypass.

So ist aus der JP-A-61223215 ein im Abgasstrom angeordneter Partikelfilter bekannt, der zwei Bypassleitungen zur Umgehung des Partikelfilters aufweist. Ferner sind in dem System durch Steilglieder betätigbare Regelklappen angeordnet, die die Bypassleitungen entsprechend dem Betriebsmodus öffnen oder schließen, um das Abgas entsprechend durch den Partikelfilter oder die Bypassleitungen zu leiten.JP-A-61223215 discloses a particle filter arranged in the exhaust gas flow has two bypass lines for bypassing the particle filter. Furthermore, in the System arranged by stepping elements control flaps arranged the bypass lines Open or close according to the operating mode to match the exhaust gas through the particle filter or the bypass lines.

Aus der DE-A-39 00 532 ist eine Abgasemissionsregelvorrichtung mit einem Partikelfilter und einem Bypass bekannt, wobei entsprechende Regelklappen hinter dem Bypass und vor dem Filter angeordnet sind, um den Abgasstrom je nach Betriebsmodus durch den Filter bzw. durch den Bypass zu führen. Auch hier werden die Regelklappen durch Stellglieder angetrieben.From DE-A-39 00 532 is an exhaust emission control device with a particle filter and a bypass known, with corresponding control flaps behind the bypass and are arranged in front of the filter to cut the exhaust gas flow depending on the operating mode To pass filter or through the bypass. The regulating flaps are also here Actuators driven.

Der Erfindung liegt daher die Aufgabe zugrunde, einen Partikelfilter für ein CRT-System einer Dieselbrennkraftmaschine zu schaffen, bei dem eine Zwangsregeneration nicht notwendig ist.The invention is therefore based on the object of a particle filter for a CRT system to create a diesel engine in which a forced regeneration is not necessary is.

Die Aufgabe wird durch die Merkmale eines Partikelfilters nach Anspruch 1 gelöst. Bevorzugte Ausgestaltungen und Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche.The object is achieved by the features of a particle filter according to claim 1. Preferred refinements and developments of the invention are the subject of Dependent claims.

Erfindungsgemäß ist der Bypass direkt im Innern dem Partikelfilter angeordnet, wobei der Eintritt in den Bypass in einem Gebiet der Stirnfläche des Filters liegt, das im normalen Betrieb nur sehr gering oder gar nicht angeströmt wird. Beispielsweise sind diese gering angeströmten Gebiete bei einer Anströmung der vorderen Stirnfläche des Partikelfilters und der Verwendung eines symmetrischen Anströmtrichters äußere Gebiete oder Randbereiche der vorderen Stirnfläche des Partikelfilters. Bei anderen Anströmtrichtern sind dies Gebiete außerhalb der Kernströmung. Es ist auch möglich, entsprechende Maßnahmen im Anströmtrichter zu ergreifen, beispielsweise durch Anbringen eines Ablenkbleches oder dergleichen, so daß die Eintrittsöffnung des Bypasses quasi im Windschatten liegt und die Strömung des anströmenden Abgases im Normalbetrieb von der Bypass-Öffnung ferngehalten wird.According to the bypass is arranged directly inside the particle filter, wherein the entry into the bypass lies in an area of the end face of the filter which is in the normal operation is very little or not at all. For example  these low-flow areas when the front face of the Particulate filter and the use of a symmetrical flow funnel outer Areas or edge areas of the front end face of the particle filter. With others Inflow hoppers are areas outside the core flow. It is also possible, to take appropriate measures in the inflow funnel, for example by Attaching a baffle or the like, so that the inlet opening of the Bypasses are in the slipstream and the flow of the incoming exhaust gas in Normal operation is kept away from the bypass opening.

Arbeitet der Partikelfilter eines CRT-Systems unter den entsprechenden Bedingungen für eine kontinuierliche Regeneration im CRT-Bereich, so ist der Gegendruck im Partikelfilter niedrig, das Abgas durchströmt im Kernstrom den Filter und tritt aus diesem mit einer stark verringerten Partikelanzahl wieder aus. Dabei liegt die Partikelreduzierung bei ca. 90%. Der Bypass wird in diesem Fall, da er in einem nicht angeströmten Bereich liegt, nicht durchströmt. Im Fall, daß das System nicht im CRT-Bereich arbeitet, erhöht sich aufgrund der Partikelakkumulation im Kernbereich des Partikelfilters der Gegendruck gegenüber dem anströmenden Abgas. Durch den dadurch entstehenden Rückstau vor der Eintrittsoberfläche des Partikelfilters wird nun auch der Bypass im früher strömungsarmen Gebiet aufgrund seines geringen Gegendrucks wirksam. Ein Teil des Abgases durchläuft daher den Bypass und strömt hinter dem Partikelfilter ungefiltert wieder aus. Die Partikelreduzierung des Filters kann sich dadurch während des Überlaufs auf bis zu 60% verschlechtern, aber es kann zu keiner Filterblockade kommen. Der Bypass im Partikelfilter kommt bei Fahrzuständen zum Einsatz, die zu einer überdurchschnittlichen Abgasgegendruckerhöhung führen, beispielsweise bei langsamen Stadtverkehr.Does the particle filter of a CRT system work under the appropriate conditions for Continuous regeneration in the CRT area is the back pressure in the particle filter low, the exhaust gas flows through the filter in the core flow and emerges from it with a greatly reduced number of particles. The particle reduction is approx. 90%. In this case, the bypass, because it is located in a non-flow area, not flowed through. In the event that the system does not work in the CRT area, increases due to the particle accumulation in the core area of the particle filter, the back pressure compared to the incoming exhaust gas. Due to the resulting backwater The bypass in the former surface now becomes the inlet surface of the particle filter low flow area effective due to its low back pressure. Part of the Exhaust gas therefore passes through the bypass and flows unfiltered behind the particle filter out again. The particle reduction of the filter can change during the Overflow deteriorate up to 60%, but there can be no filter blockage come. The bypass in the particle filter is used in driving conditions that are too lead to an above-average increase in exhaust gas back pressure, for example slow city traffic.

Als Partikelfilter können Wabenkörper verwendet werden, beispielsweise SiC-Filter oder Keramikmonolithfilter, mit wechselseitig verschlossenen Kanäle. Da der Verschluß der Kanäle als einer der letzten Schritte bei der Herstellung eines Filters durchgeführt wird, kann der Bypass hergestellt werden, indem in einem strömungsarmen Abschnitt des Filters die Verstopfung oder der Verschluß der durchgängigen Kanäle nicht aufgebracht wird. Bei handelsüblichen SiC-Segmenten hat der Bypass die rechteckige Form eines Segments, das 9 × 9 Zellen aufweist. Vorzugsweise beträgt Fläche der Eintrittsöffnung des Bypasses 1 bis 5% der gesamten vorderen Stirnfläche bzw. Eintrittsfläche des Filters. Die Form des Partikelfilters ist vorzugsweise rund, oval oder trioval, wobei sich die äußere Form nach den Begebenheiten der Einbauumgebung richtet. Honeycomb bodies can be used as particle filters, for example SiC filters or Ceramic monolith filter, with mutually closed channels. Since the closure of the Channels as one of the last steps in making a filter is performed the bypass can be made by placing it in a low flow section of the Filters the blockage or obstruction of the through channels not applied becomes. In the case of commercially available SiC segments, the bypass has the rectangular shape of a Segment that has 9 × 9 cells. The area of the inlet opening is preferably of the bypass 1 to 5% of the total front face or entry area of the Filter. The shape of the particle filter is preferably round, oval or trioval, whereby the outer shape depends on the conditions of the installation environment.  

Vorzugsweise kann der Partikelfilter mit integriertem Bypass als Bausatz hinter einem Serienkatalysator oder einschließlich eines verbesserten Katalysators als Nachrüstsatz unter jedes geeignete Fahrzeug gebaut werden.The particle filter with an integrated bypass can preferably be used as a kit behind one Standard catalytic converter or including an improved catalytic converter as a retrofit kit built under any suitable vehicle.

Eine bevorzugte Ausführungsform eines Partikelfilters für ein CRT-System mit integriertem Bypass wird nachfolgend anhand einer Figur erläutert, wobei der obere Teil der Figur den Bypass im Normalbetrieb, und der untere Teil der Figur das Verhalten des Bypasses bei außergewöhnlichen Fahrzuständen zeigt, die zu einer Erhöhung des Gegendrucks führen.A preferred embodiment of a particle filter for a CRT system with Integrated bypass is explained below using a figure, the upper part the figure shows the bypass in normal operation, and the lower part of the figure shows the behavior of the Bypasses shows in exceptional driving conditions, which leads to an increase in Lead back pressure.

Die Figur zeigt im oberen Teil einen durch einen Monolithen 1 gebildeten Partikelfilter, dessen vordere Stirnfläche 2 von mit Partikel behaftetem Abgas 3 angeströmt wird. Aufgrund der Strömungsbedingungen, die beispielsweise durch die geometrische Ausgestaltung des Anströmtrichters des nicht dargestellten Gehäuses hervorgerufen werden, ergibt sich eine Anströmung der vorderen Stirnfläche in der Form eines symbolisch dargestellten Kernstroms 4. Gereinigtes Abgas 5 verläßt den Monolithen 1 an seiner hinteren Stirnfläche 10. Ferner weist der Monolith 1 einen im Monolithen 1 integrierten Bypass 6 auf, dessen Eintrittsöffnung 7 in der vorderen Stirnfläche 2 des Monolithen 1 in einem strömungsarmen oder strömungsfreien Gebiet angeordnet ist. Dieses wird symbolisch durch den Kernstrom 4 dargestellt, der die Eintrittsöffnung 7 des Bypasses 6 nicht anströmt. In der dargestellten Weise arbeitet der Partikelfilter im CRT- Bereich bei einem niedrigen Gegendruck im Kernstrom 4 des Monolithen 1.The figure shows in the upper part a particulate filter formed by a monolith 1 , the front end face 2 of which is flown by exhaust gas 3 which is contaminated with particles. Due to the flow conditions, which are caused, for example, by the geometrical configuration of the inflow funnel of the housing (not shown), there is an inflow onto the front end face in the form of a symbolically represented core flow 4 . Cleaned exhaust gas 5 leaves the monolith 1 on its rear end face 10 . Furthermore, the monolith 1 has a bypass 6 integrated in the monolith 1 , the inlet opening 7 of which is arranged in the front end face 2 of the monolith 1 in a low-flow or non-flow area. This is symbolically represented by the core flow 4 , which does not flow against the inlet opening 7 of the bypass 6 . In the manner shown, the particle filter works in the CRT range at a low back pressure in the core stream 4 of the monolith 1 .

Der untere Teil der Figur zeigt das System bei hohem Gegendruck im Kernstrom 4 des Monolithen 1, wobei der überdurchschnittlich erhöhte Abgasgegendruck im Monolithen durch den Fahrzustand des Kraftfahrzeugs bedingt ist. Aufgrund des Gegendrucks im Monolithen 1 verändert sich das Strömungsfeld vor der vorderen Stirnfläche 2 des Monolithen 1 und es kommt zu einem Rückstau. Aufgrund dieses Rückstaus in der Kernstromzone 4 gelangt partikelbehaftetes Abgas 8 in der Form eines Seitenstroms zur Eintrittsöffnung 7 des den Monolithen in Längsrichtung durchziehenden Bypasses 6. Der partikelbehaftete Abgasseitenstrom 8 durchtritt den Bypass und tritt als ungereinigte Abgasbestandteile 9 aus dem Monolithen 1 aus. Somit kann sich zwar die Partikelreduzierung während des Überlaufs auf bis zu 60% im Vergleich zur normalen 90%igen Filterung verschlechtern, aber es kann zu keiner Filterblockade kommen. Liegen motorseitig anschließend wieder CRT-Bedingungen vor, so erniedrigt sich der Gegendruck im Kernbereich 4 aufgrund der dann wieder stattfindenden Oxidation der Partikel wieder, so daß das System nach einiger Zeit wieder in den im oberen Teil der Figur dargestellten Zustand übergeht. The lower part of the figure shows the system with a high back pressure in the core flow 4 of the monolith 1 , the above-average increased exhaust gas back pressure in the monolith being caused by the driving state of the motor vehicle. Due to the counter pressure in the monolith 1 , the flow field in front of the front end face 2 of the monolith 1 changes and there is a backflow. Because of this backflow in the core flow zone 4 , particle-laden exhaust gas 8 in the form of a side flow reaches the inlet opening 7 of the bypass 6 which runs through the monolith in the longitudinal direction. The exhaust gas side stream 8 containing particles passes through the bypass and emerges from the monolith 1 as unpurified exhaust gas constituents 9 . Thus, the particle reduction during the overflow can deteriorate up to 60% compared to normal 90% filtering, but there can be no filter blockage. If there are CRT conditions on the engine side again, the back pressure in the core region 4 decreases again due to the oxidation of the particles which then takes place again, so that the system changes back to the state shown in the upper part of the figure after some time.

BEZUGSZEICHENLISTELIST OF REFERENCE NUMBERS

11

Monolith
monolith

22

Vordere Stirnfläche (Eintrittsfläche)
Front face (entry surface)

33

Partikelbehaftetes Abgas
Particulate exhaust gas

44

Kernstrom
nuclear power

55

Gefiltertes Abgas
Filtered exhaust gas

66

Bypass
bypass

77

Eintrittsöffnung
inlet opening

88th

Partikelbehafteter Abgasseitenstrom
Particulate exhaust side stream

99

Ungereinigtes Abgas nach Filterung
Uncleaned exhaust gas after filtering

1010

Hintere Stirnfläche
Rear face

Claims (9)

1. Partikelfilter für ein CRT-System zur Abgasreinigung einer Dieselbrennkraftmaschine mit einem in dem Abgassystem angeordneten Partikelfilter (1), dadurch gekennzeichnet, daß der Partikelfilter (1) ein in seinem Inneren in Längsrichtung angeordneten Bypass (6) aufweist.1. Particle filter for a CRT system for exhaust gas purification of a diesel internal combustion engine with a particle filter ( 1 ) arranged in the exhaust system, characterized in that the particle filter ( 1 ) has a bypass ( 6 ) arranged in its interior in the longitudinal direction. 2. Partikelfilter nach Anspruch 1, dadurch gekennzeichnet, daß die Öffnung (7) des Bypasses (6) an einem Ort der vorderen Stirnfläche (2) des Partikelfilters (1) angeordnet ist, der nicht oder nur gering vom partikelbehafteten Abgas (3) angeströmt wird.2. Particulate filter according to claim 1, characterized in that the opening ( 7 ) of the bypass ( 6 ) is arranged at a location on the front end face ( 2 ) of the particulate filter ( 1 ) which does not or only slightly flows from the exhaust gas ( 3 ) containing particles becomes. 3. Partikelfilter nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Partikelfilter (1) durch einen Wabenkörper gebildet wird.3. Particle filter according to one of claims 1 to 3, characterized in that the particle filter ( 1 ) is formed by a honeycomb body. 4. Partikelfilter nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Partikelfilter (1) durch einen Monolithen gebildet wird.4. Particle filter according to one of claims 1 to 3, characterized in that the particle filter ( 1 ) is formed by a monolith. 5. Partikelfilter nach einem der Ansprüche 3 oder 4, dadurch gekennzeichnet, daß der Partikelfilter wechselseitig verschlossene Kanäle aufweist.5. Particulate filter according to one of claims 3 or 4, characterized in that the Particle filter has mutually closed channels. 6. Partikelfilter nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß der Partikelfilter (1) ein Keramik-Monolith ist.6. Particle filter according to claim 4 or 5, characterized in that the particle filter ( 1 ) is a ceramic monolith. 7. Partikelfilter nach einem der Ansprüche 5 oder 6, dadurch gekennzeichnet, daß der Bypass (6) durch eine Anzahl nicht verschlossener Kanäle gebildet wird.7. Particulate filter according to one of claims 5 or 6, characterized in that the bypass ( 6 ) is formed by a number of unclosed channels. 8. Partikelfilter nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß bei einem durch eine Anzahl von Segmenten gebildeten Partikelfilter (1) der Bypass (6) durch ein Segment mit nicht verschlossenen Kanälen gebildet wird. 8. Particle filter according to one of claims 1 to 3, characterized in that in a particle filter ( 1 ) formed by a number of segments, the bypass ( 6 ) is formed by a segment with unlocked channels. 9. Partikelfilter nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß die Fläche der Eintrittsöffnung (7) des Bypasses (6) 1%-5% der Eintrittsfläche (2) des Filters beträgt.9. Particulate filter according to one of the preceding claims, characterized in that the area of the inlet opening ( 7 ) of the bypass ( 6 ) is 1% -5% of the inlet area ( 2 ) of the filter.
DE10044893A 2000-09-12 2000-09-12 Soot filter for continuous regeneration trap of diesel exhaust purification system, includes internal longitudinal bypass Withdrawn DE10044893A1 (en)

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DE10044893A DE10044893A1 (en) 2000-09-12 2000-09-12 Soot filter for continuous regeneration trap of diesel exhaust purification system, includes internal longitudinal bypass

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006125516A1 (en) 2005-05-21 2006-11-30 Umicore Ag & Co. Kg Highly effective non-clogging filter unit
DE102005023294A1 (en) * 2005-05-20 2006-12-07 Volkswagen Ag diesel particulate Filter
WO2007025959A1 (en) * 2005-08-30 2007-03-08 Robert Bosch Gmbh Particulate filter with a device for preventing the filter from becoming clogged
DE102006047766A1 (en) * 2006-10-06 2008-04-10 Deutz Ag Device for removing soot particles from the exhaust gas stream of an internal combustion engine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62298614A (en) * 1986-06-19 1987-12-25 Matsushita Electric Ind Co Ltd Diesel exhaust gas cleaning device
JPH07109916A (en) * 1993-10-13 1995-04-25 Hakubunshiya:Kk Filter for collecting fine grain in exhaust gas
DE4207005C2 (en) * 1991-03-06 1997-03-06 Nissan Motor Exhaust gas cleaner

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62298614A (en) * 1986-06-19 1987-12-25 Matsushita Electric Ind Co Ltd Diesel exhaust gas cleaning device
DE4207005C2 (en) * 1991-03-06 1997-03-06 Nissan Motor Exhaust gas cleaner
JPH07109916A (en) * 1993-10-13 1995-04-25 Hakubunshiya:Kk Filter for collecting fine grain in exhaust gas

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* Cited by examiner, † Cited by third party
Title
Patents Abstracts of Japan, August 31 1995, Vol. 1995, No. 07 & JP 7109916 A *
Patents Abstracts of Japan, M-704,June 3 1988, Vol.12, No.190 & JP 62298614 A *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005023294A1 (en) * 2005-05-20 2006-12-07 Volkswagen Ag diesel particulate Filter
WO2006125516A1 (en) 2005-05-21 2006-11-30 Umicore Ag & Co. Kg Highly effective non-clogging filter unit
DE102005023518B4 (en) * 2005-05-21 2007-09-06 Umicore Ag & Co. Kg Blockage-free filter unit with high efficiency
WO2007025959A1 (en) * 2005-08-30 2007-03-08 Robert Bosch Gmbh Particulate filter with a device for preventing the filter from becoming clogged
DE102006047766A1 (en) * 2006-10-06 2008-04-10 Deutz Ag Device for removing soot particles from the exhaust gas stream of an internal combustion engine

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