EP0292688A2 - Arrangement of soot filter in a diesel engine exhaust system - Google Patents

Arrangement of soot filter in a diesel engine exhaust system Download PDF

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Publication number
EP0292688A2
EP0292688A2 EP88106099A EP88106099A EP0292688A2 EP 0292688 A2 EP0292688 A2 EP 0292688A2 EP 88106099 A EP88106099 A EP 88106099A EP 88106099 A EP88106099 A EP 88106099A EP 0292688 A2 EP0292688 A2 EP 0292688A2
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EP
European Patent Office
Prior art keywords
burner
exhaust gas
soot filter
soot
filter system
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.)
Ceased
Application number
EP88106099A
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German (de)
French (fr)
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EP0292688A3 (en
Inventor
Dieter Dr. Görlich
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Webasto SE
Original Assignee
Webasto SE
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Filing date
Publication date
Application filed by Webasto SE filed Critical Webasto SE
Publication of EP0292688A2 publication Critical patent/EP0292688A2/en
Publication of EP0292688A3 publication Critical patent/EP0292688A3/en
Ceased legal-status Critical Current

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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
    • F01N3/02—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
    • F01N3/032—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 during filter regeneration only
    • 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
    • F01N3/025—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 fuel burner or by adding fuel to exhaust
    • 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
    • F01N2230/00—Combination of silencers and other devices
    • F01N2230/02—Exhaust 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
    • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
    • F01N2410/04—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device during regeneration period, e.g. of particle filter
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/14—Plurality of outlet tubes, e.g. in parallel or with different length
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/30—Exhaust treatment

Definitions

  • the invention relates to a soot filter system in the exhaust tract of a diesel engine, which comprises at least two soot filters connected in parallel and a regeneration device with at least one burner. To control the paths of engine exhaust gas and regeneration gas, at least one control flap is connected upstream of the soot filters.
  • the entire exhaust system should be tuned to the burner properties or vice versa in order to ensure reliable operation of the burner for the regeneration process of the soot filters.
  • the invention therefore aims to provide a soot filter system while overcoming the difficulties described above, which enables reliable regeneration of the soot filter in a structurally simple manner even with leaking control flaps, without complicated and cost-intensive measures being provided on the exhaust system and the burner devices.
  • the design should be such that one or more burners with low power can be used and maximum operating reliability is achieved.
  • a soot filter system in the exhaust tract of a diesel internal combustion engine with at least two soot filters connected in parallel and a regeneration device with at least one burner for the soot filter, wherein at least one control flap for controlling the regeneration process is connected upstream of the soot filters, characterized in that the burner with exhaust gas is operated and arranged downstream of the control valve (s).
  • Such a soot filter system according to the invention has the advantage that the burners are thus operated exhaust gas, which serves as an oxygen supplier for the burner, so that there are no high requirements for the valve tightness and an air conveyor for the compressors is avoided. Even if the control flaps in such a soot filter system leak or become leaky over time, this does not pose any difficulties when operating the burner, since the burner may then only receive a slightly larger amount of exhaust gas for its operation. Since the burner, viewed in the direction of the exhaust gas flow, is arranged behind the control flap for the regeneration process, and this flap is closed for carrying out the regeneration process the burner during the regeneration in accordance with the requirements in a controllable manner is constantly flowed through by the exhaust gas of the internal combustion engine.
  • the amount of exhaust gas required for the operation of the burner can be supplied to it in a variety of ways, which will be explained in more detail below. Since the burner is intended for the regeneration of a so-called double soot filter system, in which two soot filters connected in parallel are used, the desired amount of gas can be supplied to the burner. This means that the burner output can be obtained as desired and thus an optimal regeneration behavior can be set.
  • An exhaust gas feed line is preferably connected to the burner, which branches off at or upstream of the branching point to the soot filters connected in parallel from the exhaust system of the diesel engine. Exhaust gas can be fed to the burner via this exhaust gas supply line for operation during the regeneration process, if necessary, even if the control flap assigned to the soot filter to be regenerated is closed and the other soot filter is used for soot filtering.
  • the common two filters are assigned a common burner, so that the overall volume of such a soot filter system can be reduced overall and of course the costs for such a system can also be reduced thereby.
  • a quantity control device for the quantity of exhaust gas supplied which is preferably formed by a flap, can be arranged in the exhaust gas supply line to the burner.
  • a common burner is intended for the regeneration of the two soot filters in an alternating sequence
  • at least one flap is expediently connected to the burner, which serves to direct the fuel gases it supplies to one of the soot filters to be regenerated.
  • the design can be made such that a branching is provided in the area of the burner outlet and then the hot combustion gases supplied by the burner are fed to the soot filter to be regenerated in each case by correspondingly controlling the flaps in the branch line sections.
  • such a design can be made that a common flap is provided which is intended for controlling the gas paths of engine exhaust gas and regeneration gas.
  • a common flap is then required at the branching area of the soot filter connected in parallel.
  • Even with such a flap there are no high demands on the tightness, since if the flaps leak, only a small portion of the exhaust gas, namely that of the leakage current at the flap, is added to the hot combustion gases supplied by the burner. The operation of the burner as such is hardly affected by this, since a higher gas pressure is always present in the burner.
  • the burner fuel gas supply lines are connected, in each of which at least one flap is arranged, so that, by appropriate control of these flaps, soot filters to be regenerated that are desired are generated with the hot combustion gases on the burner output for the initiation of the regeneration process can be applied.
  • a further embodiment variant according to the invention provides such a design that a burner is connected upstream of each filter, so that as a whole two burners are required in a double oil filter system, which are then operated separately from one another in the soot filter regeneration.
  • This has the advantage that the respective burner can be arranged directly in the exhaust pipe section leading to the filter, the burner then being supplied with exhaust gas through a specifically determined leak area of the upstream control flap, so that in this case there is deliberately a leakage gap at the control flaps is present and the amount of fuel gas from the burner is equal to the amount of gas leakage from the respective control flap.
  • no additional exhaust gas supply lines to the burners are required, and in particular the control flaps can be deliberately made leaky.
  • the exhaust pipe section is branched upstream of each burner and a common flap is arranged in the branching area.
  • the leakage current at this common flap corresponds to the fuel gas flow for operating the burner by means of exhaust gas, with the advantage over the above-described embodiments that only a single flap is required for the design simplification, both as a control flap for the Soot filter regeneration is used as well as for supplying an amount of exhaust gas to operate the burner.
  • a control flap is arranged in each exhaust pipe section leading to the filter, and the respective burners are preferably not located directly in the exhaust gas flow arranged, but the burner output of each burner opens into the exhaust gas line, and the burners are supplied with exhaust gas via separate supply lines, so that the burner is practically not flowed through or flowed around by the exhaust gas in the case of filter operation.
  • An expedient embodiment according to the invention is further characterized in that the regeneration device is arranged between an exhaust gas collecting housing, which preferably serves as a front silencer and the soot filters connected in parallel, with the embodiments providing a separate supply of the burner or burners with exhaust gas via an exhaust gas supply line provide that these exhaust gas supply lines are connected to the housing.
  • the amount of exhaust gas supplied to the respective burner can be regulated with the aid of the upstream control flaps, for which purpose the degree of opening thereof can be adjusted.
  • FIGS. 1 and 5 The different forms of training, which are explained with reference to FIGS. 1 and 5 on the basis of preferred exemplary embodiments, are in total in each case 1a (FIG. 1), 1b (FIG. 2), 1c (FIG. 3), 1d (FIG. 4) and 1e (Fig. 5).
  • an exhaust line leading from an engine block (not shown) of a diesel engine is designated by 2.
  • This exhaust pipe 2 branches into two pipe sections 3 and 4, in each of which a soot filter 5, 6 is located in a parallel arrangement.
  • a control flap 8 and a schematically illustrated burner 10 are provided as the regeneration device, which is designated overall by 7.
  • the burner 10 is connected on its input side to an exhaust gas supply line 11 which branches upstream from the control flap 8 from the exhaust gas line 2.
  • a Klaope- 13 is arranged in this exhaust gas supply line 11 as a quantity control device 12 in the example shown.
  • the burner 10 is fed with exhaust gas from the exhaust tract of the diesel engine and the exhaust gas serves as an oxygen carrier for the burner 10. Since the burner 10 receives an arbitrarily selectable amount of exhaust gas, a burner with a low output can also be selected in order to RuBünd temperature to reach. Furthermore, since the burner 10 works with exhaust gas as an oxygen carrier, the tightness of the control flap 8 does not have to be too high, since leakage currents do not noticeably impair the operation of the burner 10, but only in the area with the hot combustion gases supplied by the burner 10 during operation the control flap 8 mix. With the help of the flap 13, the gas flow supplied to the burner 10 can be regulated if necessary.
  • the burner 10 Since the burner 10 is not directly in the exhaust gas flow when the soot filter 5 is in operation, for example, the burner 10 is largely protected against contamination by the exhaust gas in the filter operation and on the other hand it does not form any additional resistance in the exhaust gas line 2 and 3 from the Exhaust gas is flowed through during filter operation with the aid of the soot filter 5.
  • the above explanations also apply to the regeneration of the soot filter 6, for which purpose the control flap 8 is then rotated by approximately 90 °.
  • the soot filter system is generally designated 1b.
  • a collecting blower designed as a front silencer 14 is additionally arranged, into which the exhaust pipe 2 opens.
  • a common burner is also provided in the soot filter system 1b according to FIG. 2, which is denoted by 10 'in FIG. 2.
  • the burner 10 ' is supplied via an exhaust gas supply line 11' with exhaust gas, which in the example shown goes from the front silencer 14.
  • the burner outlet 17 is branched into two line sections 18, 19 and a flap 20, 21 is arranged in each of these two line sections 18, 19.
  • the line section designated 18, in which the flap 20 is arranged opens into the line section 3 downstream of the control flap 15 provided there.
  • the line section 19, in which the flap 21 is provided opens into the line section 4 downstream of the control flap 16 provided there.
  • a burner 10 'with low power is sufficient, and there are no high demands on all the flaps present in the piping system, such as the control flaps 15, 16 and the flaps 20, 21, since the possibly occurring Leakage currents are essentially no obstacle to the regeneration and / or operation of the burner 10.
  • the soot filter 6 is regenerated.
  • the control flap 15 is open and the tax thus the soot filter 6 can be regenerated.
  • the soot filter 5 is to be regenerated, the control flaps 15 and 16 and the flaps 20 and 21 just described assume their opposite positions. In this case, hot combustion gas from burner 10 'is then fed to soot filter 5 for regeneration via line section 18 and line section 3,
  • a front silencer 14 is provided, into which the exhaust line 2 opens.
  • the line sections 3, 4 with the soot filters 5, 6 branch off from this front silencer 14.
  • Control flaps 15, 16 are each arranged in the line sections 3, 4. Downstream. this control flaps 15, 16 each have a burner 22, 23 arranged directly in the line section 3 or 4, which is operated with exhaust gas.
  • the design is such that the control flaps 15, 16 deliberately allow a predetermined amount of leakage in the closed position, so that the burner 22 or 23 a corresponding amount of exhaust gas .. to operate when regenerating the respectively assigned Soot filter 5, 6 is supplied.
  • large flap gaps in the control flaps 15, 16 can therefore be accepted and at least a predetermined flap gap size must be maintained in order to supply the burner 22 or 23 with exhaust gas for regeneration.
  • the soot filter 6 is regenerated.
  • the control flap 16 is therefore in its closed position, and exhaust gases from the front silencer 14 to the burner 23 can pass through the flap gaps.
  • the amount of exhaust gas supplied to the respective burner can be regulated, for which purpose the flap is adjustable in order to vary the opening gap.
  • the burner 23 When the burner 23 is operating, it supplies hot combustion gases and these are fed directly to the soot filter 6 on a very short line section of the line section 4.
  • the regeneration of the soot filter 5 is carried out in an analogous manner, in which case the control flap 16 assumes its open position, in which it is rotated approximately 90 ° in comparison to the position shown in FIG. 3.
  • the control flap 15 then assumes its closed position similar to the position in which the control flap 16 is shown in FIG. 3.
  • FIG. 5 a soot filter system, designated overall by 1e, is shown as an example, which is similar in design to that which was explained in FIG. 3.
  • the exhaust pipe 2 opens into the front silencer 14 and from this branch off the pipe sections 3, 4 in which the soot filters 5, 6 are located.
  • control flaps 15, 16 are arranged in these line sections 3, 4.
  • the soot filter system 1e according to FIG. 5 has two burners 22 'and 23', which do not lie directly in the exhaust gas flow, but whose outlet opens into the respective line section 3, 4.
  • an exhaust gas supply line 11a, 11b is provided, which is connected to the front silencer 14.
  • quantity control devices similar to those that are shown, for example, in FIG. 1 and designated 12 and 13 there may be provided in the exhaust gas supply lines 11a, 11b.
  • this soot filter system 1e shown in FIG. 5 two burners 22 ', 23' are thus provided, which are largely protected from exhaust gases during filter operation and also do not represent any additional line resistance in the line sections 3, 4 in which the soot filter 5, 6 are arranged.
  • veins can also be pre-generalized and in particular more than two soot filters can also be connected in parallel.

Abstract

An arrangement of a soot filter in a diesel engine exhaust system comprises at least two parallel-connected soot filters (5, 6). A regeneration device having at least one burner (10) is provided for regeneration and control flaps (8) are positioned upstream of the soot filters (5, 6) of the arrangement of soot filters, by means of which control flaps (8) the soot filter which is in each case to be regenerated is decoupled from the exhaust gas flow in the exhaust system. The burner (10), which supplies hot combustion gases for regenerating the soot filter, is operated with exhaust gas from the exhaust system, which serves as an oxygen carrier, and the burner (10) is arranged downstream of the control flap (8). According to a first preferred embodiment, a common burner (10) is provided for all these filters to be regenerated and this is not located directly in the exhaust system lines carrying the exhaust gas. It is preferably supplied with exhaust gas via separate exhaust feed lines (11). Alternatively, a separate burner can be assigned to each branch line (3, 4) in which the respective soot filter (5, 6) is located, and can be located directly in the line section upstream of the soot filter. Such a burner can be supplied directly by the exhaust gas leakage occurring at the control flaps. Alternatively, the burners which are assigned to the respective line branch only with the respective soot filters are also arranged in a branch line branching off from these line sections, and the burners are then supplied with a separate exhaust gas feed line. <IMAGE>

Description

Die Erfindung befaßt sich mit einer Rußfilteranlage im Abgastrakt einer Diesel-Brennkraftmaschine, die wenigstens zwei parallel geschaltete Rußflter und eine Regenerie­rungseinrichtung mit wenigstens einem Brenner umfaßt. Zur Steu­erung der Wege von Motorabgas und Regeneriergas ist wenigstens eine Steuerklappe den Rußfiltern vorgeschaltet.The invention relates to a soot filter system in the exhaust tract of a diesel engine, which comprises at least two soot filters connected in parallel and a regeneration device with at least one burner. To control the paths of engine exhaust gas and regeneration gas, at least one control flap is connected upstream of the soot filters.

Wenn zum Regenerieren von Rußfiltern Brenner eingesetzt wer­den, sollte die gesamte Abgasanlage auf die Brennereigenschaf ten oder umgekehrt abgestimt werden, um einen zuverlässigen Betrieb des Brenners für den Regenerierungsvorgang der Ruß­filter zu gewährleisten.If burners are used to regenerate soot filters, the entire exhaust system should be tuned to the burner properties or vice versa in order to ensure reliable operation of the burner for the regeneration process of the soot filters.

Wenn nun solche Brenner mit Luft als Oxidationsmittel betrie­ben werden und diese Brenner mit niedrigem Luftdruck arbeiten sollen, so ist es erforderlich, daß die Steuerklappen für die Steuerung des Regenerierungsvorganges zuverlässig dicht sind, was aber im Hinblick auf die dort herrschenden hohen Temperaturen und/oder aufgrund der Verschmutzungsneigung all­gemein gesehen wenigstens bei langzeitigem Betrieb Schwierig­keiten bereitet. Daher ist man bestrebt, die undichten Klappen betriebssicher zu machen. Die Folge ist eine höhere Gebläselei­leistung, die bei Fahrzeugen im allgemeinen nicht zur Verfügung steht.If such burners are now operated with air as the oxidizing agent and these burners are to work with low air pressure, then it is necessary that the control flaps for the control of the regeneration process are reliably tight, but in view of the high temperatures prevailing there and / or due to Generally speaking, the tendency to soiling presents difficulties, at least during long-term operation. Therefore, efforts are made to make the leaky flaps reliable. The result is higher fan power, which is generally not available in vehicles.

Andererseits hat es sich gezeigt, daß bei der Verwendung eines Abgasnachbrenners, der vom gesamten Abgas der Brennkraftma­schine durchströmt wird, für den Regenerierungsvorgang zur Er­zeugung von heißen Verbrennungsgasen solche Brenner eine große Brennerleistung haben müssen, die zudem noch regelbar sein muß, um bei diesem Anwendungsgebiet die gewünschten Erfor­ dernisse für die Regenerierung einhalten zu können.On the other hand, it has been shown that when using an exhaust gas afterburner, through which the entire exhaust gas of the internal combustion engine flows, such burners must have a large burner output for the regeneration process for generating hot combustion gases, which burner output must also be controllable in order to achieve this in the application area desired refor to be able to comply with the requirements for the regeneration.

Die Erfindung zielt daher darauf ab, unter Überwindung der zuvor geschilderten Schwierigkeiten eine Rußfilteranlage bereitzustellen, die auch bei undichten Steuerklappen eine zuverlässige Regenerierung der Rußfilter auf konstruktiv einfache Weise ermöglicht, ohne daß komplizierte und kosten­intensive Maßnahmen an der Abgasanlage und den Brennerein­richtungen vorgesehen sind. Insbesondere soll die Auslegung derart getroffen werden, daß man ein oder mehrere Brenner mit kleiner Leistung einsetzen kann und ein Maximum an Betriebs­zuverlässigkeit erreicht wird.The invention therefore aims to provide a soot filter system while overcoming the difficulties described above, which enables reliable regeneration of the soot filter in a structurally simple manner even with leaking control flaps, without complicated and cost-intensive measures being provided on the exhaust system and the burner devices. In particular, the design should be such that one or more burners with low power can be used and maximum operating reliability is achieved.

Erfindungsgemäß zeichnet sich hierzu eine Rußfilteranlage im Abgastrakt einer Diesel-Brennkraftmaschine mit wenigstens zwei parallel geschalteten Rußfiltern und einer Regenerier­einrichtung mit wenigstens einem Brenner für die Rußfilter, wobei wenigstens eine Steuerklappe zur Steuerung des Regene­rierungsvorgangs den Rußfiltern vorgeschaltet ist, dadurch aus, daß der Brenner mit Abgas betrieben ist und stromab der oder den Steuerklappe(n) angeordnet ist.According to the invention, a soot filter system in the exhaust tract of a diesel internal combustion engine with at least two soot filters connected in parallel and a regeneration device with at least one burner for the soot filter, wherein at least one control flap for controlling the regeneration process is connected upstream of the soot filters, characterized in that the burner with exhaust gas is operated and arranged downstream of the control valve (s).

Eine solche Rußfilteranlage nachder Erfindung bringt den Vor­teil mit sich, daß die Brenner somit Abgas betrieben werden, das als Sauerstofflieferant für den Brenner dient, so daß an die Klappendichtigkeit keine hohen Anforderungen zu stellen sind und ein Luftförderer der Verdichter vermieden wird. Selbst wenn die Steuerklappen bei einer solchen Rußfilteranlage un­dicht sind oder mit der Zeit undicht werden, bereitet dies keine Schwierigkeiten beim Betreiben des Brenners, da die­ser dann lediglich möglicherweise nur eine geringfügig größere Abgasmenge für seinen Betrieb erhält. Da der Brenner gesehen in Richtung des Abgasstromes - hinter der Steuerklappe für den Regenerierungsvorgang angeordnet ist, und diese Klappe zur Durchführung des Regenerierungsvorganges geschlossen wird, kann der Brenner während der Regenerierung entsprechend den Erfor­dernissen in beherrschbarer Weise betriebe ständig vom Abgas der Brennkraftmaschine durchströmt ist.Die für den Betrieb des Brenners erforderliche Abgasmenge kann diesem auf die verschiedensten Weisen zugeführt werden, die nachstehend noch näher erläutert werden. Da der Brenner für die Regenerierung einer sogenannten Doppel-Rußfilteranlage bestimmt ist, bei denen zwei parallel geschaltete Rußfilter verwendet werden, kann dem Brenner eine gewünschte Gasmenge zugeführt werden. Das bedeutet, daß die Brennerleistung beliebig fesgelangt werden kann und so ein optimales Reenerierverhalten einestellt werden kann Vorzugsweise ist mit dem Brenner eine Abgaszufuhrleitung ver­bunden, die an oder stromauf der Verzweigungsstelle zu den parallel geschalteten Rußfiltern von der Abgasanlage der Die­sel-Brennkraftmaschine abzweigt. Über diese Abgaszufuhrleitung kann dem Brenner für den Betrieb beim Regenerierungsvorgang, gegebenenfalls regelbar, Abgas zugeführt werden, auch wenn die dem zu regenerierenden Rußfilter zugeordnete Steuerklappe geschlossen ist und für die Rußfilterung der andere Rußfilter genutzt wird.Such a soot filter system according to the invention has the advantage that the burners are thus operated exhaust gas, which serves as an oxygen supplier for the burner, so that there are no high requirements for the valve tightness and an air conveyor for the compressors is avoided. Even if the control flaps in such a soot filter system leak or become leaky over time, this does not pose any difficulties when operating the burner, since the burner may then only receive a slightly larger amount of exhaust gas for its operation. Since the burner, viewed in the direction of the exhaust gas flow, is arranged behind the control flap for the regeneration process, and this flap is closed for carrying out the regeneration process the burner during the regeneration in accordance with the requirements in a controllable manner is constantly flowed through by the exhaust gas of the internal combustion engine. The amount of exhaust gas required for the operation of the burner can be supplied to it in a variety of ways, which will be explained in more detail below. Since the burner is intended for the regeneration of a so-called double soot filter system, in which two soot filters connected in parallel are used, the desired amount of gas can be supplied to the burner. This means that the burner output can be obtained as desired and thus an optimal regeneration behavior can be set. An exhaust gas feed line is preferably connected to the burner, which branches off at or upstream of the branching point to the soot filters connected in parallel from the exhaust system of the diesel engine. Exhaust gas can be fed to the burner via this exhaust gas supply line for operation during the regeneration process, if necessary, even if the control flap assigned to the soot filter to be regenerated is closed and the other soot filter is used for soot filtering.

Gemäß einer vorteilhaften Ausgestaltungsform nach der Erfin­dung ist den vorzugsweise zwe ßfiltern ein gemeinsamer Brenner zugeordnet, so daß sich das Bauvolumen einer solchen Rußfilteranlage insgesamt gesehen reduzieren läßt und sich hierdurch natürlich auch die Kosten für eine solche Anlage senken lassen.According to an advantageous embodiment according to the invention, the common two filters are assigned a common burner, so that the overall volume of such a soot filter system can be reduced overall and of course the costs for such a system can also be reduced thereby.

Um ein von der Auslegung der Abgasanlage der Brennkraftma­schine weitgehend unabhängiges und unbeeinflußtes Arbeiten des Brenners zu gewährleisten, kann in der Abgaszufuhrleitung zum Brenner noch eine Mengenregeleinrichtung für die zuge­führte Abgasmenge angeordnet sein, die vorzugsweise von einer Klappe gebildet wird.In order to ensure that the burner operates largely independently of and unaffected by the design of the exhaust system of the internal combustion engine, a quantity control device for the quantity of exhaust gas supplied, which is preferably formed by a flap, can be arranged in the exhaust gas supply line to the burner.

Wenn, wie voranstehend angegeben ist, ein gemeinsamer Bren­ner für die Regenerierung der beiden Rußfilter in abwechseln­der Reihenfolge bestimmt ist, so ist zweckmäßigerweise dem Brenner wenigstens eine Klappe nachgeschaltet, die zur Len­kung der von ihm gelieferten Brenngase zu einem der zu re­generierenden Rußfilter dient. Hierbei kann die Auslegung derart getroffen werden, daß im Bereich des Brennerausgan­ges eine Verzweigung vorgesehen ist und dann die vom Brenner gelieferten heißen Verbrennungsgase durch die entsprechende Steuerung der Klappen in den Zweigleitungsabschnitten dem je­weils zu regenerierenden Rußfilter zugeleitet werden.If, as stated above, a common burner is intended for the regeneration of the two soot filters in an alternating sequence, then at least one flap is expediently connected to the burner, which serves to direct the fuel gases it supplies to one of the soot filters to be regenerated. Here, the design can be made such that a branching is provided in the area of the burner outlet and then the hot combustion gases supplied by the burner are fed to the soot filter to be regenerated in each case by correspondingly controlling the flaps in the branch line sections.

Gemäß einer besonders vorteilhaften Ausgestaltung nach der Erfindung kann eine solche Auslegung getroffen werden, daß eine gemeinsame Klappe vorgesehen ist, die für die Steuerung der Gaswege von Motorabgas und Regenerierungsgas bestimmt ist. Bei einer solchen Auslegungsform ist am Verzweigungsbereich der parallel geschalteten Rußfilter dann nur eine einzige Klappe erforderlich. Selbst an eine solche Klappe sind keine hohen Anforderungen an die Dichtigkeit zu stcllen, da im Falle eines Undichtwerdens der Klappen lediglich den vom Brenner gelieferten heißen Verbrennungsgasen auch ein geringfügiger Abgasanteil, nämlich jenem des Leckstromes an der Klappe, bei­gemischt wird. Der Betrieb des Brenners als solcher wird aber hierdurch kaum beeinträchtigt, da im Brenner immer ein höherer Gasdruck vorhanden ist.According to a particularly advantageous embodiment according to the invention, such a design can be made that a common flap is provided which is intended for controlling the gas paths of engine exhaust gas and regeneration gas. With such a design, only a single flap is then required at the branching area of the soot filter connected in parallel. Even with such a flap, there are no high demands on the tightness, since if the flaps leak, only a small portion of the exhaust gas, namely that of the leakage current at the flap, is added to the hot combustion gases supplied by the burner. The operation of the burner as such is hardly affected by this, since a higher gas pressure is always present in the burner.

Gemäß einer alternativen Ausbildungsform ist der Brenner­Brenngaszufuhrleitungen verbunden, in denen jeweils wenig­stens eine Klappe angeordnet ist, so daß durch entsprechende Steuerung dieser Klappen jeweils gewinschte zu re`generie­rende Rußfilter mit den heißen Verbrennungsgasen am Brenner­ ausgang für die Einleitung des Regenerierungsvorganges beauf­schlagt werden kann.According to an alternative embodiment, the burner fuel gas supply lines are connected, in each of which at least one flap is arranged, so that, by appropriate control of these flaps, soot filters to be regenerated that are desired are generated with the hot combustion gases on the burner output for the initiation of the regeneration process can be applied.

Eine weitere Ausführungsvariante nach der Erfindung sieht eine solche Auslegung vor, daß jedem Filter ein Brenner vor­geschaltet ist, so daß man also insgesamt gesehen bei einer Dop.oelfilteranlage zwei Brenner benötigt, die dann jeweils gesondert voneinander bei der Rußfilterregenerierung betrie­ben werden. Hierbei ergibt sich der Vorteil, daß der jewei­lige Brenner direkt in dem zum Filter führenden Abgasleitungs­abschnitt angeordnet sein kann, wobei dann die Versorgung des Brenners mit Abgas durch einen gezielt bestimaren Leckbe­reich der vorgeschalteten Steuerklappe erfolgt, so daß in die­sem Fall bewußt ein Leckspalt an den Steuerklappen vorhanden ist und die Brenngasmenge des Brenners gleich der Leck­gasmenge der jeweiligen Steuerklappe ist. Bei einer solchen Ausbildungsform benötigt man daher keine zusätzlichen Abgas­zufuhrleitungen zu den Brennern und insbesondere können die Steuerklappen bewußt undicht gemacht werden.A further embodiment variant according to the invention provides such a design that a burner is connected upstream of each filter, so that as a whole two burners are required in a double oil filter system, which are then operated separately from one another in the soot filter regeneration. This has the advantage that the respective burner can be arranged directly in the exhaust pipe section leading to the filter, the burner then being supplied with exhaust gas through a specifically determined leak area of the upstream control flap, so that in this case there is deliberately a leakage gap at the control flaps is present and the amount of fuel gas from the burner is equal to the amount of gas leakage from the respective control flap. In such a form of training, therefore, no additional exhaust gas supply lines to the burners are required, and in particular the control flaps can be deliberately made leaky.

Gemäß einer zweckmäßigen Weiterbildung nach der Erfindung ist der Abgasleitungsabschnitt stromauf jedes Brenners ver­zweigt und im Verzweigungsbereich ist eine gemeinsame Klappe angeordnet. Auch bei dieser Ausf,legungsform entspricht der Leckstrom an dieser gemeinsamen Klappe dem Brenngasstrom zum Betreiben des Brenners mittels Abgas, wobei man als Vor­teil gegenüber den vorangehend geschilderten Ausbildungsformen erhält, daß zur konstruktiven Vereinfachung nur eine einzige Klappe benötigt wird, die sowohl als Steuerklappe für die Rußfilterregenerierung genutzt wird als auch für die Zu­führung einer Abgasmenge zum Betreiben des Brenners dient.According to an expedient development according to the invention, the exhaust pipe section is branched upstream of each burner and a common flap is arranged in the branching area. In this embodiment, too, the leakage current at this common flap corresponds to the fuel gas flow for operating the burner by means of exhaust gas, with the advantage over the above-described embodiments that only a single flap is required for the design simplification, both as a control flap for the Soot filter regeneration is used as well as for supplying an amount of exhaust gas to operate the burner.

Gemäß einer alternativen Ausführungsform nach der Erfindung ist in jedem zum Filter führenden Abgasleitungsabschnitt jeweils eine Steuerklappe angeordnet und vorzugsweise sind die jeweiligen Brenner nicht direkt im Abgasstrom liegend angeordnet, sondern der Brennerausgang jedes Brenners mündet in den Abgaslei c itt, und die Brenner wer­den mit Abgas über gesonderte Zufuhrleitungen versorgt, so daß der Brenner im Falle des Filterbetriebes praktisch nicht vom Abgas durchströmt oder umströmt ist. Hierdurch kön­nen Störungen des Brennerbetriebs, beispielsweise bedingt durch Verschmutzungen, leichter vermieden werden und der Brenner führt nicht zu erhöhtem Strömungswiderstand für das Motorab­gas. Durch Einbau einer Steuerklappe allerdings kann auch ein Durchströmen mit Motorabgas fast vollständig vermieden werden. Eine zweckmäßige Ausgestaltung nach der Erfindung zeichnet sich ferner dadurch aus, daß die Regenerierungseinrichtung zwi­schen einem Abgassammelgehäuse, das vorzugsweise als Vorschall­dämpfer dient und den parallel geschalteten Rußfiltern ange­ordnet ist, wobei bei den Ausbildungsformen, die eine geson­derte Versorgung des oder der Brenner mit Abgas über eine Ab­gaszufuhrleitung vorsehen, diese Abgaszufuhrleitungen in Ver­bindung mit dem Gehäuse stehen.According to an alternative embodiment according to the invention, a control flap is arranged in each exhaust pipe section leading to the filter, and the respective burners are preferably not located directly in the exhaust gas flow arranged, but the burner output of each burner opens into the exhaust gas line, and the burners are supplied with exhaust gas via separate supply lines, so that the burner is practically not flowed through or flowed around by the exhaust gas in the case of filter operation. This makes it easier to avoid malfunctions in burner operation, for example due to contamination, and the burner does not lead to increased flow resistance for the engine exhaust gas. By installing a control valve, however, the flow of engine exhaust gas can be almost completely avoided. An expedient embodiment according to the invention is further characterized in that the regeneration device is arranged between an exhaust gas collecting housing, which preferably serves as a front silencer and the soot filters connected in parallel, with the embodiments providing a separate supply of the burner or burners with exhaust gas via an exhaust gas supply line provide that these exhaust gas supply lines are connected to the housing.

Wenn ferner der jeweilige Brenner im Abgasstrom liegt, so kann man mit Hilfe der vorgeschalteten Steuerklappen die dem jeweili­gen Brenner zugeführte Abgasmenge regeln, wozu diese hinsichtlich ihres Öffnungsgrades verstellbar sind.Furthermore, if the respective burner is in the exhaust gas flow, the amount of exhaust gas supplied to the respective burner can be regulated with the aid of the upstream control flaps, for which purpose the degree of opening thereof can be adjusted.

Die Erfindung wird nachstehen- Beispielen unter Bezugnahme auf die beigefügte Zeichnung näher erläutert. Darin zeigt:

  • Fig. 1 eine schematische Ansicht einer ersten Aus­bildungsform einer Rußfilteranlage nach der Erfindung,
  • Fig. 2 eine Ausführungsvariante derselben, wobei wie bei dem ersten Ausführungsbeispiel auch hier lediglich ein gemeinsamer Brenner für die Regenerierung beider Rußfilter vorgesehen ist,
  • Fig. 3 einer Ausführungsvariante einer Rußfilteran­lage, die für jeden Rußfilter einen Brenner hat,
  • Fig. 4 eine Ausführungsvariante der vorangehenden Ausbildungsform, bei der Vereinfachungen hinsichtlich der Klappenanzahl verdeutlicht sind, und
  • Fig. 5 eine weitere Ausbildungsform einer Rußfilter­anlage mit je einem Brenner für jeden Rußfilter, bei der die Brenner aber über gesonderte Abgaszufuhrleitungen mit Abgas zur Nutzung als Brenngas versorgt werden.
The invention is explained in more detail below with reference to the accompanying drawings. It shows:
  • 1 is a schematic view of a first embodiment of a soot filter system according to the invention,
  • 2 shows an embodiment variant of the same, wherein, as in the first exemplary embodiment, only a common burner is provided for the regeneration of both soot filters,
  • 3 shows an embodiment variant of a soot filter system which has a burner for each soot filter,
  • Fig. 4 shows a variant of the previous embodiment, in which simplifications with regard to the number of flaps are clarified, and
  • Fig. 5 shows a further embodiment of a soot filter system with one burner for each soot filter, but in which the burners are supplied with exhaust gas for use as fuel gas via separate exhaust gas supply lines.

In den Figuren der Zeichnung sind gleiche oder ähnliche Teile mit denselben Bezugszeichen versehen.In the figures of the drawing, identical or similar parts are provided with the same reference symbols.

Die unterschiedlichen Ausbildungsformen, die anhand der Fig. 1 und 5 anhand von bevorzugten Ausführungsbeispielen erläutert werden, sind insgesamt jeweils mit 1a (Fig. 1), 1b (Fig. 2), 1c (Fig. 3), 1d (Fig. 4) und 1e (Fig. 5) be­zeichnet.The different forms of training, which are explained with reference to FIGS. 1 and 5 on the basis of preferred exemplary embodiments, are in total in each case 1a (FIG. 1), 1b (FIG. 2), 1c (FIG. 3), 1d (FIG. 4) and 1e (Fig. 5).

Bei der in Fig. 1 insgesamt mit 1a bezeichneten Rußfilteran­lage ist mit 2 eine von einem nicht dargestellten Motorblock einer Diesel-Brennkraftmaschine abgehende Abgasleitung be­zeichnet. Diese Abgasleitung 2 verzweigt sich in zwei Lei­tungsabschnitte 3 und 4, in denen in parallel geschalteter Anordnung jeweils ein Rußfilter 5, 6 liegt. Als Regenerierungs­einrichtung, die insgesamt mit 7 bezeichnet ist, sind eine Steuerklappe 8 und ein schematisch dargestellter Brenner 10 vorgesehen. Der Brenner 10 ist an seiner Eingangsseite mit einer Abgaszufuhrleitung 11 verbunden, die stromauf der Steuer­klappe 8 von der Abgasleitung 2 abzweigt. Obgleich icht unbe­ dingt erforderlich, ist bei dem dargestellten Beispiel in dieser Abgaszufuhrleitung 11 als Mengenregeleinrichtung 12 eine Klaope- 13 angeordnet. Bei diesem Beispiel benötigt man daher zur Regenerierung beider Rußfilter 5, 6 nur einen ge­meinsamen Brenner 10 und eine einzige Steuerklappe 8, die bei diesem Beispiel eine Doppelfunktion hat, da sie nicht nur für die Regenerierung des Rußfilters 5 bei der in Fig. 1 gezeigten Stellung diesen von der Abgasleitung 2 abkoppelt, sondern zugleich auch den vom Brenner 10 gelieferten heissen Verbrennungsgasstrom zu dem Leitungsabschnitt 3 lenkt, über den dann die heißen Verbrennungsgase zum Rußfilter 5 geleitet werden.In the soot filter system, designated overall by 1a in FIG. 1, an exhaust line leading from an engine block (not shown) of a diesel engine is designated by 2. This exhaust pipe 2 branches into two pipe sections 3 and 4, in each of which a soot filter 5, 6 is located in a parallel arrangement. A control flap 8 and a schematically illustrated burner 10 are provided as the regeneration device, which is designated overall by 7. The burner 10 is connected on its input side to an exhaust gas supply line 11 which branches upstream from the control flap 8 from the exhaust gas line 2. Although not inconsistent absolutely necessary, a Klaope- 13 is arranged in this exhaust gas supply line 11 as a quantity control device 12 in the example shown. In this example, therefore, only one common burner 10 and a single control flap 8 are required for the regeneration of both soot filters 5, 6, which has a double function in this example, since they are not only for the regeneration of the soot filter 5 in the position shown in FIG. 1 decouples it from the exhaust gas line 2, but at the same time also directs the hot combustion gas flow supplied by the burner 10 to the line section 3, via which the hot combustion gases are then passed to the soot filter 5.

Bei diesem Beispiel wird der Brenner 10 mit Abgas aus dem Abgastrakt der Diesel-Brennkraftmaschine gespeist und das Abgas dient als Sauerstoffträger für den Brenner 10. Da der Brenner 10 eine beliebig wählbare Abgasmenge erhält, kann auch ein Brenner mit kleiner Leistung gewählt werden, um die RuBündtemperatur zu erreichen. Da ferner der Brenner 1o mit Ab­gas als Sauerstoffträger arbeitet, brauchenan die Dichtigkeit der Steuerklappe 8 keine zu hohen Anforderungen gestellt wer­den, da Leckströme nicht merklich den Betrieb des Brenners 10 beeinträchtigen, sondern sich nur mit den vom Brenner 10 beim Arbeiten gelieferten heißen Verbrennungsgasen im Bereich der Steuerklappe 8 vermischen. Mit Hilfe der Klappe 13 kann der dem Brenner 10 zugeleitete Gasstrom gegebenenfalls geregelt wer­den. Da der Brenner 10 nicht direkt im Abgasstrom liegt, wenn der Rußfilter 5 beispielsweise in Betrieb ist, wird einerseits der Brenner 10 vor Verschmutzungen durch das Abgas im Filter­betrieb weitgehend geschützt und andererseits bildet er auch keinen zusätzlichen Widerstand in der Abgasleitung 2 und 3, die vom Abgas beim Filterbetrieb mit Hilfe des Rußfilters 5 durchströmt wird. In analoger Weise gelten die vorangehenden Ausführungen auch für die Regenerierung des Rußfilters 6, wozu dann die Steuerklappe 8 um etwa 90° verdreht wird.In this example, the burner 10 is fed with exhaust gas from the exhaust tract of the diesel engine and the exhaust gas serves as an oxygen carrier for the burner 10. Since the burner 10 receives an arbitrarily selectable amount of exhaust gas, a burner with a low output can also be selected in order to RuBünd temperature to reach. Furthermore, since the burner 10 works with exhaust gas as an oxygen carrier, the tightness of the control flap 8 does not have to be too high, since leakage currents do not noticeably impair the operation of the burner 10, but only in the area with the hot combustion gases supplied by the burner 10 during operation the control flap 8 mix. With the help of the flap 13, the gas flow supplied to the burner 10 can be regulated if necessary. Since the burner 10 is not directly in the exhaust gas flow when the soot filter 5 is in operation, for example, the burner 10 is largely protected against contamination by the exhaust gas in the filter operation and on the other hand it does not form any additional resistance in the exhaust gas line 2 and 3 from the Exhaust gas is flowed through during filter operation with the aid of the soot filter 5. In an analogous manner, the above explanations also apply to the regeneration of the soot filter 6, for which purpose the control flap 8 is then rotated by approximately 90 °.

In Fig. 2 ist die Rußfilteranlage insgesamt mit 1b bezeichnet. Hierbei ist zusätzlich noch ein als Vorschalldämpfer 14 aus­gebildetes Samelgebläse angeordnet, in das die Abgasleitung 2 mündet. Von diesem Vorschalldämpfer 14 gehen dann die beiden parallel liegenden Leitungsabschnitte 3 und 4 ab, in denen die Rußfilter 5, 6 liegen.In Fig. 2, the soot filter system is generally designated 1b. Here, a collecting blower designed as a front silencer 14 is additionally arranged, into which the exhaust pipe 2 opens. The two parallel pipe sections 3 and 4, in which the soot filters 5, 6 are located, then depart from this front silencer 14.

In den Leitungsabschnitten 3 und 4 liegt jeweils eine Steuer­klappe 15, 16. Ähnlich wie in Fig. 1 ist auch bei der Ruß­filteranlage 1b nach Fig. 2 ein gemeinsamer Brenner vorge­sehen, der in Fig. 2 mit 10′ bezeichnet ist. Der Brenner 10′ wird über eine Abgaszufuhrleitung 11′ mit Abgas versorgt, die beim dargestellten Beispiel von dem Vorschalldämpfer 14 abgeht. Bei diesem Beispiel ist der Brennerausgang 17 in zwei Leitungsabschnitte 18, 19 verzweigt und in diesen beiden Leitungsabschnitten 18, 19 ist jeweils eine Klappe 20, 21 angeordnet. Der mit 18 bezeichnete Leitungsabschnitt, in dem die Klappe 20 angeordnet ist, mündet in den Leitungsabschnitt 3 stromab der dort vorgesehenen Steuerklappe 15. Der Lei­tungsabschnitt 19, in dem die Klappe 21 vorgesehen ist, mündet in den Leitungsabschnitt 4 stromab der dort vorgesehenen Steuerklappe 16. Auch bei dieser Ausbildungsform reicht ein Brenner 10′ mit kleiner Leistung aus, und es sind an alle die im Leitungssystem vorhandenen Klappen, wie die Steuerklappen 15, 16 und die Klappen 20, 21 hinsichtlich der Dichtigkeit keine hohen Anforderungen zu stellen, da die gegebenenfalls auftretenden Leckströme im wesentlichen keine Behinderung bei der Regenerierung und/oder des Betriebs des Brenners 10 darstel­len. Bei dem dort dargestellten Beispiel wird der Rußfilter 6 regeneriert. Hierzu ist die Steuerklappe 15 offen und die Steuer­ somit der Rußfilter 6 regeneriert werden kann. Wenn der Ruß­filter 5 regeneriert werden soll, so nehmen die vorangehend geschilderten Steuerklappen 15 und 16 und die Klappen 20 und 21 gerade ihre umgekehrten Stellungen ein. In diesem Fall wird dann über den Leitungsabschnitt 18 und den Leitungsab­schnitt 3 heißes Verbrennungsgas vom Brenner 10′ dem Rußfilter 5 zur Regenerierung zugeleitet,In the line sections 3 and 4 there is a control flap 15, 16. Similar to FIG. 1, a common burner is also provided in the soot filter system 1b according to FIG. 2, which is denoted by 10 'in FIG. 2. The burner 10 'is supplied via an exhaust gas supply line 11' with exhaust gas, which in the example shown goes from the front silencer 14. In this example, the burner outlet 17 is branched into two line sections 18, 19 and a flap 20, 21 is arranged in each of these two line sections 18, 19. The line section designated 18, in which the flap 20 is arranged, opens into the line section 3 downstream of the control flap 15 provided there. The line section 19, in which the flap 21 is provided, opens into the line section 4 downstream of the control flap 16 provided there. Also in this form of training, a burner 10 'with low power is sufficient, and there are no high demands on all the flaps present in the piping system, such as the control flaps 15, 16 and the flaps 20, 21, since the possibly occurring Leakage currents are essentially no obstacle to the regeneration and / or operation of the burner 10. In the example shown there, the soot filter 6 is regenerated. For this purpose, the control flap 15 is open and the tax thus the soot filter 6 can be regenerated. If the soot filter 5 is to be regenerated, the control flaps 15 and 16 and the flaps 20 and 21 just described assume their opposite positions. In this case, hot combustion gas from burner 10 'is then fed to soot filter 5 for regeneration via line section 18 and line section 3,

Bei der in Fig. 3 gezeigten Rußfilteranlage 1c ist wie bei Fig. 2 ein Vorschalldämpfer 14 vorgesehen, in den die Abgas­leitung 2 mündet. Von diesem Vorschalldämpfer 14 zweigen die Leitungsabschnitte 3, 4 mit den Rußfiltern 5, 6 ab. Steuer­klappen 15, 16 sind jeweils in den Leitungsabschnitten 3, 4 angeordnet. Stromab. dieser Steuerklappen 15, 16 ist direkt im Leitungsabschnitt 3 bzw. 4 je ein Brenner 22, 23 angeordnet, der mit Abgas betrieben wird. Bei der in Fig. 3 gezeigten Aus­bildungsform ist die Auslegung derart getroffen, daß die Steuer­klappen 15, 16 bewußt eine vorbestimmte Leckmenge in der Schließstellung durchlassen, so daß dem Brenner 22 bzw. 23 eine entsprechende Abgasmenge zum..Betreiben bei der Regenerierung des jeweils zugeordneten Rußfilters 5, 6 zugeführt wird. Bei dieser Ausbildungsform können daher große Klappenspalte bei den Steuerklappen 15, 16 in Kauf genomen werden und es muß zumindestens eine vorbestimmte Klappenabspaltgröße eingehalten werden, um den Brenner 22 bzw. 23 mit Abgas zur Regenerierung zu versorgen. Bei dem dargestellten Beispiel wird der Ruß­filter 6 regeneriert. Die Steuerklappe 16 befindet sich daher in ihrer Schließstellung, wobei über die Klappenspalte Abgase vom Vorschalldämpfer 14 zum Brenner 23 durch können. Die dem jeweiligen Brenner zugeführte Abgasmenge ist regelbar, wozu die Klappe verstellbar ist, um den Öffnungsspalt zu variieren.In the soot filter system 1c shown in FIG. 3, as in FIG. 2, a front silencer 14 is provided, into which the exhaust line 2 opens. The line sections 3, 4 with the soot filters 5, 6 branch off from this front silencer 14. Control flaps 15, 16 are each arranged in the line sections 3, 4. Downstream. this control flaps 15, 16 each have a burner 22, 23 arranged directly in the line section 3 or 4, which is operated with exhaust gas. In the embodiment shown in Fig. 3, the design is such that the control flaps 15, 16 deliberately allow a predetermined amount of leakage in the closed position, so that the burner 22 or 23 a corresponding amount of exhaust gas .. to operate when regenerating the respectively assigned Soot filter 5, 6 is supplied. In this embodiment, large flap gaps in the control flaps 15, 16 can therefore be accepted and at least a predetermined flap gap size must be maintained in order to supply the burner 22 or 23 with exhaust gas for regeneration. In the example shown, the soot filter 6 is regenerated. The control flap 16 is therefore in its closed position, and exhaust gases from the front silencer 14 to the burner 23 can pass through the flap gaps. The amount of exhaust gas supplied to the respective burner can be regulated, for which purpose the flap is adjustable in order to vary the opening gap.

Wenn der Brenner 23 arbeitet, liefertt er heiße Verbrennungsgase und diese werden auf einem sehr kurzen Leitungsabschnitt des Lei­tungsabschnittes 4 direkt dem Rußfilter 6 zugeführt. In ana­loger Weise wird die Regenerierung des Rußfilters 5 dur®hge­führt, wobei dann die Steuerklappe 16 ihre Offenstellung ein­nimt, in der sie etwa um 90° im Vergleich zu der in Fig. 3 gezeigten Stellung verdreht ist. Die Steuerklappe 15 nimt dann ihre Schließstellung ähnlich der Position ein, in der die Steuerklappe 16 in Fig. 3 dargestellt ist.When the burner 23 is operating, it supplies hot combustion gases and these are fed directly to the soot filter 6 on a very short line section of the line section 4. The regeneration of the soot filter 5 is carried out in an analogous manner, in which case the control flap 16 assumes its open position, in which it is rotated approximately 90 ° in comparison to the position shown in FIG. 3. The control flap 15 then assumes its closed position similar to the position in which the control flap 16 is shown in FIG. 3.

Ähnlich wie bei Fig. 3 ist auch bei der Ausführungsform der Rußfilteranlage 1d in Fig. 4 eine solche Auslegung getrof­fen, daß die Brenner 22 bzw. 23 zur Durchführung des Regene­rierungsbetriebes mit Abgas aus der Abgasleitung 2 versorgt werden. Bei dieser Ausbildungsform ist jedoch in Abweichung von Fig. 3 nur eine einzige Steuerklappe 24 vorgesehen, die im Verzweigungsbereich der Abgasleitung 2 angeordnet ist, an dem sich diese in die Leitungsabschnitte 3, 4 verzweigt. Auch hierbei ist der Leckstrom an der Steuerklappe 24 dafür bestimmt, den Brenner 22 bzw. 34 mit Abgas zum Betrieb zu ver­sorgen. Durch Verstellung der Steuerklappe 24 ist die Abgas­menge regelbar. In der in Fig. 4 dargestellten Position ist der Rußfilter 5 im Filterbetrieb und der Rußfilter 6 wird mit Hilfe des Brenners 23 regeneriert. Die Regenerierung des Rußfilters 5 erfolgt dann, wenn die Steuerklappe 24 eine um etwa 90° verdrehte Position im Vergleich zu der in Fig. 4 dar­gestellten Position einnimt.Similar to FIG. 3, in the embodiment of the soot filter system 1d in FIG. 4, such an arrangement is made that the burners 22 and 23 are supplied with exhaust gas from the exhaust line 2 for carrying out the regeneration operation. In this embodiment, however, in deviation from FIG. 3, only a single control flap 24 is provided, which is arranged in the branching area of the exhaust pipe 2, at which the latter branches into the pipe sections 3, 4. Here, too, the leakage current at the control flap 24 is intended to supply the burner 22 or 34 with exhaust gas for operation. The amount of exhaust gas can be regulated by adjusting the control flap 24. In the position shown in FIG. 4, the soot filter 5 is in filter mode and the soot filter 6 is regenerated with the help of the burner 23. The soot filter 5 is regenerated when the control flap 24 assumes a position rotated by approximately 90 ° in comparison to the position shown in FIG. 4.

In Fig. 5 ist eine insgesamt mit 1e bezeichnete Rußfilteran­lage als Beispiel dargestellt, die hinsichtlich der Ausbildung ähnlich jener ist, die in Fig. 3 erläutert worden ist. Wie dort gezeigt, mündet die Abgasleitung 2 in den Vorschalldämpfer 14 und von diesem zweigen die Leitungsabschnitte 3, 4 ab, in denen die Rußfilter 5, 6 liegen. Ferner sind in diesen Lei­tungsabschnitten 3, 4 Steuerklappen 15, 16 angeordnet. In Abweichung zu der Ausbildungsform 1c gemäß Fig. 3 weist die Rußfilteranlage 1e nach Fig. 5 zwei Brenner 22′ und 23′ auf, die nicht direkt im Abgasstrom liegen, sondern deren Ausgang in den jeweiligen Leitungsabschnitt 3, 4 mündet. Zur Versor­gung des Brenners 22′, 23′ mit Abgas ist jeweils eine Abgas­zufuhrleitung 11a, 11b vorgesehen, die mit dem Vorschalldämpfer 14 in Verbindung steht. Obgleich nicht dargestellt ist, kön­nen gegebenenfalls in den Abgaszufuhrleitungen 11a, 11b Men­genregeleinrichtungen ähnlich jenen vorgesehen sein, die beispielsweise in Fig. 1 dargestellt und dort mit 12 und 13 bezeichnet sind. Auch bei dieser in Fig. 5 gezeigten Rußfilter anlage 1e sind somit zwei Brenner 22′, 23′ vorgesehen, die während des Filterbetriebs weitgehend vor Abgasen geschützt sind und auch keinen zusätzlichen Leitungswiderstand in den Leitungsabschnitten 3, 4 darstellen, in denen die Rußfilter 5, 6 angeordnet sind.In FIG. 5, a soot filter system, designated overall by 1e, is shown as an example, which is similar in design to that which was explained in FIG. 3. As shown there, the exhaust pipe 2 opens into the front silencer 14 and from this branch off the pipe sections 3, 4 in which the soot filters 5, 6 are located. Furthermore, control flaps 15, 16 are arranged in these line sections 3, 4. In 3, the soot filter system 1e according to FIG. 5 has two burners 22 'and 23', which do not lie directly in the exhaust gas flow, but whose outlet opens into the respective line section 3, 4. To supply the burner 22 ', 23' with exhaust gas, an exhaust gas supply line 11a, 11b is provided, which is connected to the front silencer 14. Although not shown, quantity control devices similar to those that are shown, for example, in FIG. 1 and designated 12 and 13 there may be provided in the exhaust gas supply lines 11a, 11b. In this soot filter system 1e shown in FIG. 5, two burners 22 ', 23' are thus provided, which are largely protected from exhaust gases during filter operation and also do not represent any additional line resistance in the line sections 3, 4 in which the soot filter 5, 6 are arranged.

Selbstverständlich können in Abweichung von den vorangehend dargestellten Beispielen auch noch weitere Äderungen vor­gemein n werden und insbesondere können auch mehr als zwei Rußfilter parallel geschaltet sein.Of course, in deviation from the examples presented above, other veins can also be pre-generalized and in particular more than two soot filters can also be connected in parallel.

BezugszeichenlisteReference symbol list

1a Rußfilteranlage insgesamt in Fig. 1,
1b Rußfilteranlage insgesamt in Fig. 2,
1c Rußfilteranlage insgesamt in Fig. 3,
1d Rußfilteranlage insgesamt in Fig. 4,
1e Fußfilter-nlage insgesamt in Fig. 5,
2 Abgasleitung
3 Leitungsabschnitt oben
4 Leitungsabschnitt unten
5 Rußfilter oben
6 Rußfilter unten
7 Regenerierungseinrichtung insgesamt
8 Steuerklappe in Fig. 1
10 Brenner in Fig. 1
10′ Brenner in Fig. 2
11 Abgaszufuhrleitung in Fig. 1
11′ Abgaszufuhrleitung in Fig. 2
11a Abgaszufuhrleitung in Fig. 5
11b Abgaszufuhrleitung in Fig. 5
12 Mengenregeleinrichtung
13 Klappe hierfür
14 Vorschalldämpfer
15 Steuerklappe in Fig. 2
16 Steuerklappe in Fig. 2 unten
17 Brennerausgang in Fig. 2
18 Leitungsabschnitt in Fig. 2 oben
19 Leitungsabschnitt in Fig. 2 unten
20 Klappe in Leitungsabschnitt 18
21 Klappe in Leitungsabschnitt 19
22 Brenner in Fig. 3 oben
23 Brenner in Fig. 3 unten
22′ Brenner in Fig. 5 oben
23′ Brenner in Fig. 5 unten
24 Einzige Steuerklappe in Fig. 4
1a total soot filter system in Fig. 1,
1b soot filter system in total in Fig. 2,
1c soot filter system in total in Fig. 3,
1d soot filter system in total in Fig. 4,
1e foot filter system in total in FIG. 5,
2 exhaust pipe
3 line section above
4 line section below
5 soot filters on top
6 soot filter below
7 regeneration device in total
8 control flap in Fig. 1st
10 burners in Fig. 1st
10 'burner in Fig. 2nd
11 exhaust gas supply line in Fig. 1st
11 'exhaust gas supply line in Fig. 2nd
11a exhaust gas supply line in FIG. 5
11b exhaust gas supply line in FIG. 5
12 flow control device
13 flap for this
14 front silencer
15 control flap in FIG. 2
16 control flap in Fig. 2 below
17 burner outlet in FIG. 2
18 line section in Fig. 2 above
19 line section in Fig. 2 below
20 flap in line section 18
21 Flap in line section 19
22 burners in Fig. 3 above
23 burner in Fig. 3 below
22 'burner in Fig. 5 above
23 'burner in Fig. 5 below
24 Only control valve in Fig. 4

Claims (15)

1. Rußfilteranlage im Abgastrakt einer Diesel-Brennkraft-­maschine mit wenigstens zwei parallel geschalteten Rußfil­tern und eine Regenerierungseinrichtung mit wenigstens einem Brenner für die Rußfilter, wobei wenigstens eine Steuerklappe zur Steuerung des Regenerierungsvorganges den Rußfiltern vor­geschaltet ist, dadurchgekennzeichnet, daß der Brenner (10, 10′, 22, 23, 22′, 23′) mit Abgas betrieben ist und stromab der oder den Steuerklappe(n) (8, 15, 16, 24) angeordnet ist.1. A soot filter system in the exhaust tract of a diesel internal combustion engine with at least two soot filters connected in parallel and a regeneration device with at least one burner for the soot filter, at least one control flap for controlling the regeneration process being connected upstream of the soot filters, characterized in that the burner (10, 10 ', 22, 23, 22', 23 ') is operated with exhaust gas and is arranged downstream of the control valve (s) (8, 15, 16, 24). 2. Rußfilteranlage nach Anspruch 1, dadurch gekenn­zeichnet, daß eine Abgaszufuhrleitung (11, 11′, 11a, 11b) mit dem Brenner (10, 10′, 22, 23, 22′, 23′) verbunden ist, die an oder stromab der Verzweigungsstelle zu den parallel ge­schalteten Rußfiltern (5, 6) von der Abgasleitung (2) der Diesel-Brennkraftmaschine abzweigt.2. Soot filter system according to claim 1, characterized in that an exhaust gas supply line (11, 11 ', 11a, 11b) with the burner (10, 10', 22, 23, 22 ', 23') is connected to or downstream of the Branch to the parallel soot filters (5, 6) branches off from the exhaust pipe (2) of the diesel engine. 3. Rußfilteranlage nach Anspruch 1 oder 2, durch gekennzeichnet, daß ein gemeinsamer Brenner (10, 10′) für die Rußfilter (5, 6) vorgesehen ist.3. soot filter system according to claim 1 or 2, characterized in that a common burner (10, 10 ') for the soot filter (5, 6) is provided. 4. Rußfilteranlage nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß in der Abgaszufuhrleitung (11, 11′, 11a, 11b) zum Brenner (10, 10′ 22, 23, 22′, 23′) eine Mengen­regeleinrichtung (12) für die dem Brenner zugeführte Abgas­menge angeordnet ist.4. soot filter system according to claim 2 or 3, characterized in that in the exhaust gas supply line (11, 11 ', 11a, 11b) to the burner (10, 10' 22, 23, 22 ', 23') a quantity control device (12) for the amount of exhaust gas supplied to the burner is arranged. 5. Rußfilteranlage nach Anspruch 4, dadurch gekenn­zeichnet, daß die Mengenregeleinrichtung (12) als Klappe (13) ausgebildet ist.5. soot filter system according to claim 4, characterized in that the quantity control device (12) is designed as a flap (13). 6. Rußfilteranlage nach einem der Ånsprüche 3 bis 5 dadurch gekennzeichnet daß dem Brenner (10, 10′) wenigstens eine Klappe (8; 15, 16; 20, 21; 24) zur Lenkung der von ihm gelieferten Brenngase zu einem der zu regene­rierenden Rußfiltern (5, 6) nachgeschaltet ist.6. soot filter system according to one of claims 3 to 5, characterized in that the burner (10, 10 ') at least one flap (8; 15, 16; 20, 21; 24) for directing the fuel gases supplied by it to one of the soot filters to be regenerated (5, 6) is connected downstream. 7. Rußfilteranlage nach einem der vorangehenden An­sprüche, dadurch gekennzeichnet, daß eine einzige Klappe (8, 24) am Verzweigungsbereich der zu den Rußfiltern (5, 6) führenden Leitungsabschnitten(3, 4) angeordnet ist.7. Soot filter system according to one of the preceding claims, characterized in that a single flap (8, 24) is arranged at the branching area of the line sections (3, 4) leading to the soot filters (5, 6). 8. Rußfilteranlage nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Brennerausgang (17) mit den jeweiligen Filtern (5, 6) zugeordneten gesonderten Brenn­gaszufuhrleitungen (18, 19) verbunden ist, in denen jeweils eine Klappe (20, 21) angeordnet ist.8. soot filter system according to one of claims 1 to 6, characterized in that the burner outlet (17) with the respective filters (5, 6) associated with separate fuel gas supply lines (18, 19) is connected, in each of which a flap (20, 21) is arranged. 9. Rußfilteranlage nach einem der Ansprüche 1, 2, 4 oder 5, dadurch gekennzeichnet, daß jedem Filter (5, 6) ein Brenner (22, 23; 22′, 23) vorgeschaltet ist.9. soot filter system according to one of claims 1, 2, 4 or 5, characterized in that each filter (5, 6) has a burner (22, 23; 22 ', 23) connected upstream. 10. Rußfilteranlage nach Anspruch 9 dadurch gekenn­zeichnet, daß jeder Brenner (22, 23) in dem zum Filter (5,6) führenden Abgasleitungsabschnitt (3,4) angeordnet ist.10. Soot filter system according to claim 9, characterized in that each burner (22, 23) is arranged in the exhaust pipe section (3, 4) leading to the filter (5, 6). 11. Rußfilteranlage nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß der Abgasleitungsabschnitt (3,4) strom­auf jedes Brenners (22, 23) verzweigt ist und im Verzweigungs­bereich eine gemeinsame Klappe (24) angeordnet ist.11. Soot filter system according to claim 9 or 10, characterized in that the exhaust pipe section (3, 4) is branched upstream of each burner (22, 23) and a common flap (24) is arranged in the branching region. 12. Rußfilteranlage nach Anspruch 9 oder Anspruch 10, dadurch gekennzeichnet, daß jeweils eine der Steuerklappen (15, 16) stromauf jedes Brenners (22,23) in jedem zum Filter (5,6) führenden Abgasleitungsabschnitt (3,4) angeordnet ist.12. A soot filter system according to claim 9 or claim 10, characterized in that one of the control flaps (15, 16) is arranged upstream of each burner (22, 23) in each exhaust gas line section (3, 4) leading to the filter (5, 6). 13. Rußfilteranlage nach den Ansprüchen 9 und 12, dadurch gekennzeichnet, daß der Ausgang jedes Brenners (22′, 23′) in den jeweiligen zum Filter (5,6) führenden Abgasleitungsab­schnitt (3,4) mündet und mit je einer Abgaszufuhrleitung (11a, 11b) verbunden ist, die von der Abgasleitung (2) strom­auf der jeweiligen Steuerklappe (15, 16) abzweigt.13. soot filter system according to claims 9 and 12, characterized in that the output of each burner (22 ', 23') opens into the respective exhaust gas line section (3,4) leading to the filter (5,6) and each with an exhaust gas supply line (11a , 11b), which branches off from the exhaust pipe (2) upstream of the respective control flap (15, 16). 14. Rußfilteranlage nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Regenerierungseinrichtung (7) zwischen einem Abgassammelgehäuse,, das vorzugsweise als Vor­schalldämpfer (14) ausgebildet ist, und den parallel geschal­teten Rußfiltern (5,6) angeordnet ist.14. Soot filter system according to one of the preceding claims, characterized in that the regeneration device (7) is arranged between an exhaust gas collecting housing, which is preferably designed as a front silencer (14), and the soot filters (5, 6) connected in parallel. 15. Rußfilteranlage nach einem der Ansprüche 9 bis 12 oder 14, dadurch gekennzeichnet, daß die Klappe (15,16) zur Rege­lung der dem jeweiligen Brenner (22, 23) zugeführten Abgasmenge verstellbar ist.15 soot filter system according to one of claims 9 to 12 or 14, characterized in that the flap (15,16) for controlling the amount of exhaust gas supplied to the respective burner (22, 23) is adjustable.
EP88106099A 1987-05-21 1988-04-16 Arrangement of soot filter in a diesel engine exhaust system Ceased EP0292688A3 (en)

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DE3717140 1987-05-21
DE19873717140 DE3717140A1 (en) 1987-05-21 1987-05-21 Soot filter system in the exhaust tract of a diesel internal combustion engine

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EP0292688A2 true EP0292688A2 (en) 1988-11-30
EP0292688A3 EP0292688A3 (en) 1988-12-14

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WO1995014852A1 (en) * 1993-11-29 1995-06-01 Bayerische Motoren Werke Aktiengesellschaft Multiple internal combustion engine exhaust system with a burner

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EP0292688A3 (en) 1988-12-14
US4945722A (en) 1990-08-07
JPS63302118A (en) 1988-12-09
DE3717140A1 (en) 1988-12-08

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