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EP0690210A1 - Process and device for controllably regenerating a diesel soot filter - Google Patents

Process and device for controllably regenerating a diesel soot filter Download PDF

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Publication number
EP0690210A1
EP0690210A1 EP95109133A EP95109133A EP0690210A1 EP 0690210 A1 EP0690210 A1 EP 0690210A1 EP 95109133 A EP95109133 A EP 95109133A EP 95109133 A EP95109133 A EP 95109133A EP 0690210 A1 EP0690210 A1 EP 0690210A1
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EP
European Patent Office
Prior art keywords
exhaust gas
soot filter
diesel soot
temperature
diesel
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.)
Granted
Application number
EP95109133A
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German (de)
French (fr)
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EP0690210B1 (en
Inventor
Konstantin N. Prof.Dr.-Ing. Pattas
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Individual
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Individual
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Priority claimed from DE19506983A external-priority patent/DE19506983A1/en
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Publication of EP0690210A1 publication Critical patent/EP0690210A1/en
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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
    • F01N3/023—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
    • F01N3/0235—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 exhaust gas throttling means
    • 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
    • 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
    • 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
    • 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

Definitions

  • the invention relates to a method and a device for regenerating the diesel soot filter of a diesel engine.
  • diesel soot filters with a porous wall allow gaseous components of the exhaust gas to pass through, but hinder the passage of solid particles, which mainly result from the coagulation of carbon molecules and heavy hydrocarbons.
  • soot particles deposited in the diesel soot filter which increasingly clog the diesel soot filter during operation, can be broken down to regenerate the diesel soot filter by means of thermal (combustion), catalytic or other processes.
  • the reaction speed of the combustion of the particles collected in the diesel soot filter can increase uncontrollably under stochastic conditions with automatically triggered regeneration. This can lead to an inadmissible increase in temperature with the result of the partial or total fusion or destruction of the diesel soot filter.
  • the invention is based on the object of specifying a method and a device for regenerating diesel soot filters in diesel engines in which effective protection against damage or destruction of the diesel soot filter can be achieved more easily than before while avoiding the inconveniences of bypass operation.
  • a method according to claim 1 and a device according to claim 2 serve to achieve this object.
  • the diesel particulate filter is divided into a plurality of sections connected in parallel in the exhaust gas flow, of which at least one can be completely or partially switched off depending on the exhaust gas temperature prevailing at the outlet of the relevant section.
  • a four-cylinder diesel engine 1 is shown, in the exhaust tract 3 diesel soot filters 2, 4 and 6 are installed, wherein no bypass bridging the diesel soot filter is provided.
  • These three diesel soot filters are installed parallel to one another in the exhaust tract 3 and comprise a common inlet 5, individual outlet sockets 5a, 5b, 5c, each of which leads into an associated diesel soot filter 2, 4, 6, and individual outlet sockets 7a, 7b, 7c, which each start from a diesel soot filter 2, 4, 6 and are brought together in a common outlet 7.
  • inlets 5a, 5b, 5c there are one throttle body 10, 12, 14, that is to say as many throttle bodies as diesel soot filters 2, 4, 6.
  • thermocouples 9, 11, 13 are provided for the individual detection of the exhaust gas temperatures of the three diesel soot filters, the output signals of which are input into an electronic unit 100 controlling the throttle bodies.
  • the throttle bodies 2, 4, 6 are designed here as throttle valves.
  • Soot particles deposited in the diesel particulate filters 2, 4, 6 are regenerated from time to time by burning off due to an increase in temperature during operation or by means of exhaust gas throttling.
  • all throttle elements 10, 12, 14 are actuated simultaneously by the electronic unit 100.
  • the diesel soot filters 2, 4 or 6 are shut off by shutting off the associated throttle element 10, 12 or 14 the exhaust gas flow is switched off, behind which the measured exhaust gas temperature exceeds a predetermined temperature.
  • the relevant inlet 5a, b or c is shut off in whole or in part by means of the corresponding throttle element 10, 12 or 14 in response to an ON / OFF signal or an analog actuation signal which is output by the electronic unit 100.
  • This unit 100 receives the output signals of the thermocouples 9, 11, 13 as input signals.
  • the reaction rate of the commenced combustion of the soot collected in the diesel soot filter, at constant exhaust gas temperature, is a function of the mass flow rate m.
  • Figure 2 shows a qualitative diagram of the dependence of the reaction rate w of the combustion on the mass flow rate m. If the temperature behind the diesel particulate filter 2 loaded with a particle quantity G (FIG. 1) exceeds the maximum permissible exhaust gas temperature, this filter 2 is partially or even completely shut off by actuating the associated throttle valve 10, with the result that the mass flow is reduced below m 1. The main exhaust gas throughput is now passed through the diesel particulate filters 4 and 6. Accordingly, the mass flow rate m is increased by these filters 4, 6 to over m2.
  • reaction rate w is reduced in all filters, as can be seen from the diagram in FIG. 2.
  • this filter is throttled or blocked in the same way as before filter 2.
  • a prerequisite for complete protection against uncontrolled combustion of the deposited particle quantity in the diesel soot filter is that the mass flow rate in the last filter causes the reaction to be aborted or "deleted” even when the diesel engine is idling.
  • the volume and the number of diesel soot filters for a specific diesel engine are predetermined.
  • FIG. 3 shows a system of a six-cylinder diesel engine with four diesel soot filters 16, 18, 20, 22.
  • each diesel soot filter is assigned a throttle element 24, 26, 28, 30 in the corresponding inlets, not shown here, and a thermocouple 32, 34, 36, 38 in the corresponding outlets, not shown here.
  • the individual switch-off of the diesel soot filter from the exhaust gas flow is carried out in stages by means of the electronic unit (not shown here) in the same way as in the embodiment according to FIG. 1, with at least one diesel soot filter being left in operation in the last stage.
  • the throttle bodies can be designed as throttle valves or poppet valves.
  • thermocouples T1 and T2 are installed in the center.
  • the section 52 is chosen so small by the dimenionization of the tubular inlet 51 that the mass flow flowing through it is so great even at idle that the combustion of the deposited soot is delayed or even interrupted.
  • the one according to FIG. 4 (and also the embodiments according to FIGS. 5 and 6) manages with only one throttle element 40, which reduces the number of moving and thus vulnerable parts and the construction simplified.
  • the omission of the throttle element for section 52 surprisingly does not affect forced regeneration by exhaust gas throttling.
  • Regeneration due to particle erosion is forced by closing the single shut-off device 40.
  • an increase in the exhaust gas back pressure and accordingly the temperature in front of both sections of the diesel soot filter is achieved.
  • Protection against uncontrolled burning usually takes effect at low to medium speeds or at low loads. A deterioration in the driving characteristics due to the increased back pressure due to the reduced outlet area is not noticed by the driver, because he can further depress the accelerator pedal to achieve the desired performance. If, on the other hand, protection occurs in the area of the maximum speed or power, the protection process can be interrupted by a kick-down switch.
  • FIG. 5 shows a diesel soot filter which has two sections, namely a larger section 67 and a smaller section 62 and no shut-off elements in the inputs 60, 61.
  • a single shut-off element is formed by a thermostat 64, which is arranged in the common outlet channel of the two sections 62, 67 and through which the exhaust gas flows through the sections 62, 67. If the thermostat expands, it closes the outlet 63 of the larger section 67 at a predetermined exhaust gas temperature.
  • monitoring of the temperatures at the filter outlet and, accordingly, an electronic control unit is superfluous, and the thermostat 64 automatically takes over the protection against uncontrolled combustion of both sections 62, 67 when the predetermined exhaust gas temperature is reached.
  • the thermostat 64 consists of a closed corrugated tube that expands axially under internal pressure. It is provided with a suitable filling made of a substance (e.g. sodium) that evaporates when a certain temperature is reached, causing a rapid increase in internal pressure. Thereby the thermostat 64 is extended elastically and the outlet 63 is shut off.
  • a substance e.g. sodium
  • FIG. 6 shows a variant of the embodiment according to FIG. 5, a small and a large section 72, 77 of a filter 71 being designed as two sections of a monolith 72. Exhaust gas flows through the sections via a common inlet 70. As with the execution 5, a thermostat 74 in the form of an axially expandable corrugated tube is arranged in the outlet 73 of the large section 77 such that it automatically closes its outlet 73 when a predetermined temperature is reached.

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  • 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)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Silencers (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

The regeneration filter uses a throttle (10,12,14) associated with each parallel section (2,4,6) of the filter, inserted in the diesel engine exhaust tract, providing controlled full or partial throttling of the exhaust flow through at least one filter section, in dependence on the detected exhaust gas temp. downstream of the filter. Pref. each of the filter sections has a respective throttle (10,12,14) inserted in its input (5a,5b,5c) and a respective temp. measuring device (9,11,13) incorporated in its output (7a,7b,7c), coupled to an electronic control device (100) for adjusting the throttles. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Regenerieren des Dieselrußfilters eines Dieselmotors.The invention relates to a method and a device for regenerating the diesel soot filter of a diesel engine.

Es ist bekannt, daß Dieselrußfilter mit poröser Wand gasförmige Bestandteile des Abgases zwar durchlassen, jedoch den Durchgang von Feststoff-Partikeln behindern, welche hauptsächlich durch Koagulieren von Kohlenstoff-Molekülen und schweren Kohlenwasserstoffen entstehen.It is known that diesel soot filters with a porous wall allow gaseous components of the exhaust gas to pass through, but hinder the passage of solid particles, which mainly result from the coagulation of carbon molecules and heavy hydrocarbons.

Die in Dieselrußfilter abgelagerten Ruß-Partikel, welche den Dieselrußfilter im Laufe des Betriebs zunehmend zusetzen, lassen sich zur Regenerierung des Dieselrußfilters mittels thermischer (Verbrennen), katalytischer oder anderer Prozesse abbauen.The soot particles deposited in the diesel soot filter, which increasingly clog the diesel soot filter during operation, can be broken down to regenerate the diesel soot filter by means of thermal (combustion), catalytic or other processes.

Durch thermisches Regenerieren bei laufenden Dieselmotor, z.B. im Betrieb eines damit ausgerüsteten Fahrzeuges, kann unter stochastischen Bedingungen bei automatisch ausgelösten Regenerieren die Reaktionsgeschwindigkeit der Verbrennung der im Dieselrußfilter gesammelten Partikel unkontrolliert steigen. Dies kann zu einer unzulässigen Erhöhung der Temperatur mit der Folge der teilweisen oder gänzlichen Verschmelzung bzw. Zerstörung des Dieselrußfilters führen.By thermal regeneration with the diesel engine running, e.g. in the operation of a vehicle equipped with it, the reaction speed of the combustion of the particles collected in the diesel soot filter can increase uncontrollably under stochastic conditions with automatically triggered regeneration. This can lead to an inadmissible increase in temperature with the result of the partial or total fusion or destruction of the diesel soot filter.

Zum Vermeiden einer unkontrollierten Verbrennung ist eine Messung der Temperatur des Abgases hinter dem Dieselrußfilter vorgeschlagen worden (DE 38 06 219 A1), wobei im Falle des Überschreitens einer vorgegebenen, maximal zulässigen Temperatur mittels einer elektronischen Einheit Ventile vor und hinter dem Dieselrußfilter derart betätigt werden, daß das gesamte Abgas über einen den Dieselrußfilter ungehenden Bypass abgeleitet wird. Somit wird der Dieselrußfilter temporär gänzlich aus dem Abgasstrom ausgeschaltet.To avoid uncontrolled combustion, a measurement of the temperature of the exhaust gas behind the diesel soot filter has been proposed (DE 38 06 219 A1), valves being actuated in front of and behind the diesel soot filter by means of an electronic unit if a predetermined maximum permissible temperature is exceeded. that the entire exhaust gas is discharged via a bypass that does not flow through the diesel soot filter. The diesel soot filter is thus temporarily switched off completely from the exhaust gas flow.

Wenngleich der Betrieb im Bypass nur einen kleinen Prozentsatz der gesamten Betriebszeit des Motors in Anspruch nimmt, ist zur Dämpfung des im Bypass-Betrieb entstehenden lästigen Geräusches der Einsatz einer Schalldämpfanlage notwendig. Außerdem ist es aus ökologischer Sicht unerwünscht auch nur über eine kurze Zeitspanne ungereinigte Abgase ungefiltert in die Umgebung zu entlassen, wie es der Bypassbetrieb mit sich bringt.Although the operation in the bypass only takes up a small percentage of the total operating time of the engine, the use of a silencing system is necessary to dampen the annoying noise that occurs in the bypass operation. In addition, from an ecological point of view, it is undesirable to discharge uncleaned exhaust gases into the environment unfiltered, even over a short period of time, as the bypass operation entails.

Es ist auch bekannt (CH 663 253 A), einen Partikelfilter im Abgastrakt einer insbesondere abgasaufgeladenen Brennkraftmaschine in zwei parallelgeschaltete Abschnitte, nämlich eine gut wärmeisolierte "Hochtemperaturflut" und eine "Niedertemperaturflut" zu unterteilen, von denen mittels einer Steuerklappe bei niedriger Motorlast lediglich die Niedertemperaturflut und bei hoher Motorlast beide Fluten durch entsprechendes Einstellen einer Steuerklappe von Abgas durchströmt werden. Dadurch wird neben einer häufigen Partikelverbrennung erreicht, daß der dem Abgastrakt nachgeschaltete Abgaslader stets schnell mit Abgas ausreichender Temperatur versorgt wird, um das sogenannte "Turboloch" beim Niederdrücken des Gaspedals zu vermeiden. Ein Schutz gegen unkontrolliertes Abbrennen abgelagerter Partikel in den Fluten ist mit der Maßnahme nach der CH-PS jedoch nicht erzielbar.It is also known (CH 663 253 A), a particle filter in the exhaust tract of an internal combustion engine, in particular an exhaust gas supercharger, into two sections connected in parallel, namely to subdivide a well heat-insulated "high-temperature flood" and a "low-temperature flood", of which only a low-temperature flood flows through a control flap, and exhaust gas flows through both floods by appropriately adjusting a control flap when the engine load is high. As a result, in addition to frequent particle combustion, the exhaust gas charger downstream of the exhaust tract is always quickly supplied with exhaust gas of sufficient temperature to avoid the so-called "turbo lag" when the accelerator pedal is depressed. However, protection against uncontrolled burning of deposited particles in the floods cannot be achieved with the measure according to the CH-PS.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zum Regenerieren von Dieselrußfiltern in Dieselmotoren anzugeben, bei dem einfacher als bisher unter Vermeidung der Unzuträglichkeiten eines Bypassbetriebes ein wirkungsvoller Schutz gegen Beschädigung oder Zerstörung des Dieselrußfilters erzielbar ist.The invention is based on the object of specifying a method and a device for regenerating diesel soot filters in diesel engines in which effective protection against damage or destruction of the diesel soot filter can be achieved more easily than before while avoiding the inconveniences of bypass operation.

Zur Lösung dieser Aufgabe dienen ein Verfahren gemäß Anspruch 1 und eine Vorrichtung gemäß Anspruch 2.A method according to claim 1 and a device according to claim 2 serve to achieve this object.

Gemäß der Erfindung ist der Dieselrußfilter in mehrere, parallel in den Abgasstrom eingeschaltete Abschnitte unterteilt, von denen mindestens einer abhängig von der jeweils am Ausgang des betreffenden Abschnittes herrschenden Abgastemperatur aus dem Abgasstrom ganz oder teilweise ausschaltbar sind.According to the invention, the diesel particulate filter is divided into a plurality of sections connected in parallel in the exhaust gas flow, of which at least one can be completely or partially switched off depending on the exhaust gas temperature prevailing at the outlet of the relevant section.

Während die Reaktion in dem isolierten Abschnitt reduziert bzw. unterbrochen ist, wird der Massendurchsatz durch den oder die verbleibenden, nicht ausgeschalteten Abschnitte des Dieselrußfilters erhöht. Dadurch wird die Reaktionsgeschwindigkeit der thermischen Regenerierung in diesen verbleibenden Abschnitten reduziert. Sollte in einen der verbleibenden nicht ausgeschalteten Abschnitte des Dieselrußfilters ebenfalls die maximal zulässige Temperatur überschritten werden, wird auch dieser Abschnitt aus dem Abgasstrom ausgeschaltet. Dies setzt sich erfindungsgemäß so lange fort, bis der Massendurchsatz durch mindestens den letzten verbleibenden Abschnitt des Dieselrußfilters soweit angewachsen ist, daß die begonnene Reaktion abgebrochen bzw. "gelöscht" wird.While the reaction in the isolated section is reduced or interrupted, the mass flow rate through the remaining section or sections of the diesel soot filter that are not switched off is increased. This causes the reaction rate of thermal regeneration to remain in these Sections reduced. If the maximum permissible temperature is also exceeded in one of the remaining sections of the diesel soot filter that are not switched off, this section is also switched off from the exhaust gas flow. According to the invention, this continues until the mass throughput through at least the last remaining section of the diesel soot filter has increased to such an extent that the started reaction is terminated or "deleted".

So wird mit einfachen Mitteln ein wirksamer Schutz gegen Beschädigen oder Zerstören des Dieselrußfilters durch unkontrolliertes Verbrennen der abgelagerten Partikel geschaffen, was einen Bypass und somit das in Bypassbetrieb unvermeidliche Abgeben ungereinigten Abgases in die Umgebung sowie eine aufwendige Schalldämpfanlage erübrigt.Effective protection against damage or destruction of the diesel soot filter by uncontrolled combustion of the deposited particles is thus created with simple means, which eliminates the need for a bypass and thus the unavoidable discharge of uncleaned exhaust gas into the environment in the bypass operation, as well as a complex silencing system.

Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.Advantageous embodiments of the invention are specified in the subclaims.

Die Erfindung ist im folgenden anhand schematischer Zeichnungen an Ausführungsbeispielen mit weiteren Einzelheiten näher erläutert. Es zeigen:

Fig. 1
einen Vierzylinder-Dieselmotor mit einen nachgeschalteten Dieselrußfilter gemäß der Erfindung im Abgastrakt;
Fig. 2
ein Diagranm mit der Reaktionsgeschwindigkeit der Regenerierung über dem Massendurchsatz des Dieselrußfilters;
Fig. 3
einen Sechszylinder-Motor mit einem abgewandelten Dieselrußfilter gemäß der Erfindung,
Fig. 4, 5 und 6
weitere Abwandlungen von Dieselrußfiltern gemäß der Erfindung.
The invention is explained in more detail below with reference to schematic drawings of exemplary embodiments. Show it:
Fig. 1
a four-cylinder diesel engine with a downstream diesel soot filter according to the invention in the exhaust system;
Fig. 2
a diagram with the reaction rate of the regeneration over the mass flow rate of the diesel soot filter;
Fig. 3
a six-cylinder engine with a modified diesel soot filter according to the invention,
4, 5 and 6
further modifications of diesel particulate filters according to the invention.

In Figur 1 ist ein Vierzylinder-Dieselmotor 1 dargestellt, in dessen Abgastrakt 3 Dieselrußfilter 2, 4 und 6 eingebaut sind, wobei kein die Dieselrußfilter überbrückender Bypass vorgesehen ist. Diese drei Dieselrußfilter sind parallel zueinander in den Abgastrakt 3 eingebaut und umfassen einen gemeinsamen Einlaß 5, davon individuell abgehende Einlaßstutzen 5a, 5b, 5c, welche jeweils in einen zugehörigen Dieselrußfilter 2, 4, 6 münden, und individuelle Auslaßstutzen 7a, 7b, 7c, welche je von einem Dieselrußfilter 2, 4, 6 ausgehen und in einen gemeinsamen Auslaß 7 zusammengeführt sind.In Figure 1, a four-cylinder diesel engine 1 is shown, in the exhaust tract 3 diesel soot filters 2, 4 and 6 are installed, wherein no bypass bridging the diesel soot filter is provided. These three diesel soot filters are installed parallel to one another in the exhaust tract 3 and comprise a common inlet 5, individual outlet sockets 5a, 5b, 5c, each of which leads into an associated diesel soot filter 2, 4, 6, and individual outlet sockets 7a, 7b, 7c, which each start from a diesel soot filter 2, 4, 6 and are brought together in a common outlet 7.

In den Einlässen 5a, 5b, 5c sind je ein Drosselorgan 10, 12, 14, - also ebensoviele Drosselorgane wie Dieselrußfilter 2, 4, 6 -, vorgesehen. Ebenso sind in den Auslässen 7a, 7b, 7c Thermoelemente 9, 11, 13 zum individuellen Erfassen der Abgastemperaturen der drei Dieselrußfilter vorgesehen, deren Ausgangssignale in eine die Drosselorgane steuernde elektronische Einheit 100 eingegeben werden. Die Drosselorgane 2, 4, 6 sind hier als Drosselklappen ausgebildet.In the inlets 5a, 5b, 5c there are one throttle body 10, 12, 14, that is to say as many throttle bodies as diesel soot filters 2, 4, 6. Likewise, in the outlets 7a, 7b, 7c, thermocouples 9, 11, 13 are provided for the individual detection of the exhaust gas temperatures of the three diesel soot filters, the output signals of which are input into an electronic unit 100 controlling the throttle bodies. The throttle bodies 2, 4, 6 are designed here as throttle valves.

In den Dieselrußfiltern 2, 4, 6 abgelagerte Rußpartikel werden von Zeit zu Zeit durch Abbrennen aufgrund einer Temperaturerhöhung während des Betriebs oder mittels Abgasdrosselung regeneriert. Im Falle einer erzwungenen Regenerierung werden alle Drosselorgane 10, 12, 14 gleichzeitig durch die elektronische Einheit 100 betätigt.Soot particles deposited in the diesel particulate filters 2, 4, 6 are regenerated from time to time by burning off due to an increase in temperature during operation or by means of exhaust gas throttling. In the case of forced regeneration, all throttle elements 10, 12, 14 are actuated simultaneously by the electronic unit 100.

Zum Schutz gegen unkontrolliertes Verbrennen beim Regenerieren werden derjenige Dieselrußfilter 2, 4 oder 6 durch Absperren des zugehörigen Drosselorganes 10, 12 oder 14 aus dem Abgasstrom ausgeschaltet, hinter dem die gemessene Abgastemperatur eine vorgegebene Temperatur überschreitet. Das Absperren des betreffenden Einlasses 5a, b oder c erfolgt ganz oder teilweise mittels des entsprechenden Drosselorganes 10, 12 oder 14 auf ein EIN/AUS-Signal bzw. analoges Betätigungssignal hin, welches von der elektronischen Einheit 100 abgegeben wird. Diese Einheit 100 erhält die Ausgangssignale der Thermoelemente 9, 11, 13 als Eingangssignale.To protect against uncontrolled combustion when regenerating, the diesel soot filters 2, 4 or 6 are shut off by shutting off the associated throttle element 10, 12 or 14 the exhaust gas flow is switched off, behind which the measured exhaust gas temperature exceeds a predetermined temperature. The relevant inlet 5a, b or c is shut off in whole or in part by means of the corresponding throttle element 10, 12 or 14 in response to an ON / OFF signal or an analog actuation signal which is output by the electronic unit 100. This unit 100 receives the output signals of the thermocouples 9, 11, 13 as input signals.

Die Reaktionsgeschwindigkeit der angefangenen Verbrennung des in Dieselrußfilter gesammelten Rußes, bei konstanter Abgastemperatur, ist eine Funktion des Massendurchsatzes m. Im Bild 2 ist qualitativ in Form eines Diagramms die Abhängigkeit der Reaktionsgeschwindigkeit w der Verbrennung vom Massendurchsatz m dargestellt. Falls die Temperatur hinter dem mit einer Partikelmenge G beladenen Dieselrußfilter 2 (Fig. 1) die maximale zulässige Abgastemperatur überschreitet, wird dieser Filter 2 durch Betätigung der zugehörigen Drosselklappe 10 teilweise oder sogar ganz abgesperrt mit der Folge, daß der Massenstrom unter m₁ reduziert wird. Jetzt wird der Hauptabgasdurchsatz über die Dieselrußfilter 4 und 6 geleitet. Dementsprechend wird der Massendurchsatz m durch diese Filter 4, 6 auf über m₂ erhöht. Das bedeutet, daß die Reaktionsgeschwindigkeit w in allen Filtern reduziert wird, wie aus dem Diagramm der Fig. 2 zu erkennen ist. Für den Fall, daß die Abgastemperatur hinter einem weiteren Filter den maximal zulässigen Wert überschreitet, z.B. hinter dem Filter 4, wird dieser Filter in der gleichen Weise wie vorher Filter 2 gedrosselt oder abgesperrt. Dies hat eine weitere Erhöhung des Massendurchsatzes m durch den Filter 6 zur Folge, in dem die Reaktionsgeschwindigkeit folglich um einen solchen Betrag reduziert wird, daß eine eventuell begonnene Reaktion abgebrochen bzw. "gelöscht" wird.The reaction rate of the commenced combustion of the soot collected in the diesel soot filter, at constant exhaust gas temperature, is a function of the mass flow rate m. Figure 2 shows a qualitative diagram of the dependence of the reaction rate w of the combustion on the mass flow rate m. If the temperature behind the diesel particulate filter 2 loaded with a particle quantity G (FIG. 1) exceeds the maximum permissible exhaust gas temperature, this filter 2 is partially or even completely shut off by actuating the associated throttle valve 10, with the result that the mass flow is reduced below m 1. The main exhaust gas throughput is now passed through the diesel particulate filters 4 and 6. Accordingly, the mass flow rate m is increased by these filters 4, 6 to over m₂. This means that the reaction rate w is reduced in all filters, as can be seen from the diagram in FIG. 2. In the event that the exhaust gas temperature behind another filter exceeds the maximum permissible value, e.g. behind the filter 4, this filter is throttled or blocked in the same way as before filter 2. This results in a further increase in the mass flow rate m through the filter 6, in which the reaction speed is consequently reduced by an amount such that a reaction which may have started is terminated or "deleted".

Der Normalbetrieb des Systems wird dann wieder aufgenommen, wenn die Abgastemperatur hinter jedem Dieselrußfilter 2, 4, 6 kleiner als der maximal zulässige Wert wird.Normal system operation will then resume if the exhaust gas temperature behind each diesel soot filter 2, 4, 6 becomes less than the maximum permissible value.

Voraussetzung für einen vollständigen Schutz gegen unkontrollierte Verbrennung der abgelagerten Partikelmenge im Dieselrußfilter ist, daß der Massendurchsatz im letzten Filter schon im Leerlauf des Dieselmotors das Abbrechen oder "Löschen" der Reaktion verursacht.A prerequisite for complete protection against uncontrolled combustion of the deposited particle quantity in the diesel soot filter is that the mass flow rate in the last filter causes the reaction to be aborted or "deleted" even when the diesel engine is idling.

So werden das Volumen und die Anzahl der Dieselrußfilter für einen bestimmten Dieselmotor vorausbestimmt.The volume and the number of diesel soot filters for a specific diesel engine are predetermined.

In Figur 3 ist eine Anlage eines Sechszylinder-Dieselmotors mit vier Dieselrußfiltern 16, 18, 20, 22 dargestellt. Auch hier sind jedem Dieselrußfilter je ein Drosselorgan 24, 26, 28, 30 in den entsprechenden, hier nicht bezeichneten Einlässen und je ein Thermoelement 32, 34, 36, 38 in den entsprechenden hier nicht bezeichneten Auslässen zugeordnet.FIG. 3 shows a system of a six-cylinder diesel engine with four diesel soot filters 16, 18, 20, 22. Here, too, each diesel soot filter is assigned a throttle element 24, 26, 28, 30 in the corresponding inlets, not shown here, and a thermocouple 32, 34, 36, 38 in the corresponding outlets, not shown here.

Die individuelle Ausschaltung der Dieselrußfilter aus dem Abgasstrom erfolgt mittels der hier nicht gezeichneten elektronischen Einheit in gleicher Weise wie bei der Ausführung nach Fig. 1 stufenweise, wobei in der letzten Stufe mindestens ein Dieselrußfilter in Betrieb belassen wird.The individual switch-off of the diesel soot filter from the exhaust gas flow is carried out in stages by means of the electronic unit (not shown here) in the same way as in the embodiment according to FIG. 1, with at least one diesel soot filter being left in operation in the last stage.

Die Drosselorgane können als Drosselklappen oder Tellerventile ausgebildet sein.The throttle bodies can be designed as throttle valves or poppet valves.

In Fig. 4 ist ein Dieselrußfilter mit zwei Eingängen 51, 52 dargestellt, das aus einem Monolith besteht. Durch den Einlaß 51, der kein Drosselorgan beinhaltet, wird das Abgas in den Abschnitt 52 des Rußfilters geleitet. Der Abschnitt 57 wird von Abgas durchströmt, das durch den Einlaß 50 geleitet wird. Dieser Einlaß 50 ist mit einem Drosselorgan 40 versehen. Hinter den Auslaßquerschnitten beider Abschnitte 52 und 57 sind jeweils mittig Thermoelemente T1 und T2 eingebaut.4 shows a diesel soot filter with two inputs 51, 52, which consists of a monolith. The exhaust gas is passed through section 51 of the soot filter through inlet 51, which does not include a throttle element. The section 57 is traversed by exhaust gas which is passed through the inlet 50. This inlet 50 is provided with a throttle body 40. Behind the outlet cross sections of both sections 52 and 57, thermocouples T1 and T2 are installed in the center.

Ein Schutz gegen unkontrollierte Verbrennung wird durch Betätigen des Drosselorgans am Einlaß 50 unabhängig davon gewährleistet, welches von beiden Thermoelementen T1 oder T2 eine unzulässige Temperatur registriert hat. Der Abschnitt 52 ist durch die Dimenionierung des rohrförmigen Einlasses 51 so klein gewählt, daß schon in Leerlauf der dadurch strömende Massenstrom so groß ist, daß die Verbrennung des abgelagerten Rußes verzögert oder sogar unterbrochen wird.Protection against uncontrolled combustion is ensured by actuating the throttle element at the inlet 50 regardless of which of the two thermocouples T1 or T2 has registered an impermissible temperature. The section 52 is chosen so small by the dimenionization of the tubular inlet 51 that the mass flow flowing through it is so great even at idle that the combustion of the deposited soot is delayed or even interrupted.

Anders als bei den Ausführungen nach den Figuren 1 und 3 kommt diejenige nach Fig. 4 (und auch die Ausführungen nach den Fig. 5 und 6) mit nur einem Drosselorgan 40 aus, was die Anzahl der beweglichen und damit anfälligen Teile vermindert und die Konstruktion vereinfacht. Der Wegfall des Drosselorganes für den Abschnitt 52 beeinträchtigt überraschenderweise eine erzwungene Regenerierung durch Abgasdrosselung nicht.In contrast to the embodiments according to FIGS. 1 and 3, the one according to FIG. 4 (and also the embodiments according to FIGS. 5 and 6) manages with only one throttle element 40, which reduces the number of moving and thus vulnerable parts and the construction simplified. The omission of the throttle element for section 52 surprisingly does not affect forced regeneration by exhaust gas throttling.

Eine Regeneration durch Partikelabbrand wird dadurch erzwungen, daß das einzige Absperrorgan 40 geschlossen wird. Dadurch wird eine Erhöhung des Abgasgegendruckes und dementsprechend der Temperatur vor beiden Abschnitten des Dieselrußfilters erreicht.Regeneration due to particle erosion is forced by closing the single shut-off device 40. As a result, an increase in the exhaust gas back pressure and accordingly the temperature in front of both sections of the diesel soot filter is achieved.

Der Schutz gegen unkontrolliertes Abbrennen wird meist bei kleinen bis mittleren Drehzahlen bzw. bei kleiner Last wirksam. Dabei wird eine Verschlechterung der Fahreigenschaften wegen des durch die verminderte Austrittsfläche erhöhten Gegendruckes vom Fahrer nicht bemerkt, denn er kann zur Erreichung der gewünschten Leistung das Gaspedal weiter durchdrücken. Sollte andererseits der Schutz in Bereich der Höchstdrehzahl bzw. -Leistung auftreten, kann durch einen Kick-Down Schalter der Schutzprozess unterbrochen werden.Protection against uncontrolled burning usually takes effect at low to medium speeds or at low loads. A deterioration in the driving characteristics due to the increased back pressure due to the reduced outlet area is not noticed by the driver, because he can further depress the accelerator pedal to achieve the desired performance. If, on the other hand, protection occurs in the area of the maximum speed or power, the protection process can be interrupted by a kick-down switch.

Wie bekannt wird in diesen Betriebsbereich der Schutz gegen unkontrolliertes Abbrennen durch die Kühlwirkung der Abgasströmung übernommen. Analog kann eine angefangene Drosselung aufgehoben werden, falls die volle Leistung von Fahrer verlangt wird.As is known, protection against uncontrolled burning by the cooling effect of the exhaust gas flow is taken over in this operating range. Similarly, a started throttling can be canceled if full performance is required from the driver.

In Fig. 5 ist ein Dieselrußfilter dargestellt, der zwei Abschnitte, nämlich einen größeren 67 und einen kleineren Abschnitt 62 und keine Absperrorgane in den Eingängen 60, 61 hat. Ein einziges Absperrorgan ist von einem Thermostat 64 gebildet, der im gemeinsamen Ausgangskanal der beiden Abschnitte 62, 67 angeordnet ist und von den Abgasströmen durch die Abschnitte 62, 67 durchströmt wird. Dehnt sich der Thermostat aus, so verschließt er den Ausgang 63 des größeren Abschnittes 67 bei einer vorgegebenen Abgastemperatur. Bei dieser Ausführung wird eine Überwachung der Temperaturen am Filterausgang und dementsprechend eine elektronische Kontrolleinheit überflüssig, den der Thermostat 64 übernimmt automatisch den Schutz gegen unkontrollierte Verbrennung beider Abschnitte 62, 67, wenn die vorgegebene Abgastemperatur erreicht wird.5 shows a diesel soot filter which has two sections, namely a larger section 67 and a smaller section 62 and no shut-off elements in the inputs 60, 61. A single shut-off element is formed by a thermostat 64, which is arranged in the common outlet channel of the two sections 62, 67 and through which the exhaust gas flows through the sections 62, 67. If the thermostat expands, it closes the outlet 63 of the larger section 67 at a predetermined exhaust gas temperature. In this embodiment, monitoring of the temperatures at the filter outlet and, accordingly, an electronic control unit is superfluous, and the thermostat 64 automatically takes over the protection against uncontrolled combustion of both sections 62, 67 when the predetermined exhaust gas temperature is reached.

Der Thermostat 64 besteht bei dieser Ausführung aus einen abgeschlossenen Wellrohr, das sich unter inneren Überdruck axial ausdehnt. Es ist mit einer geeigneten Füllung aus einem Stoff (z.B. Natrium) versehen, der beim Erreichen einer bestimmten Temperatur verdampft und dadurch eine rasche Innendruckerhöhung verursacht. Damit wird der Thermostat 64 elastisch verlängert und der Auslaß 63 abgesperrt.In this embodiment, the thermostat 64 consists of a closed corrugated tube that expands axially under internal pressure. It is provided with a suitable filling made of a substance (e.g. sodium) that evaporates when a certain temperature is reached, causing a rapid increase in internal pressure. Thereby the thermostat 64 is extended elastically and the outlet 63 is shut off.

In Fig. 6 ist eine Variante der Ausführung nach Fig. 5 dargestellt, wobei ein kleiner und ein großer Abschnitt 72, 77 eines Filters 71 als zwei Abschnitte eines Monolithen 72 ausgebildet sind. Die Abschnitte werden über einen gemeinsamen Einlaß 70 von Abgas durchströmt. Wie bei der Ausführung nach Fig. 5 ist ein Thermostat 74 in Form eines axial dehnbaren Wellrohres im Auslaß 73 des großen Abschnitts 77 so angeordnet, daß es dessen Austritt 73 bei Erreichen einer vorgegebenen Temperatur selbsttätig verschließt.FIG. 6 shows a variant of the embodiment according to FIG. 5, a small and a large section 72, 77 of a filter 71 being designed as two sections of a monolith 72. Exhaust gas flows through the sections via a common inlet 70. As with the execution 5, a thermostat 74 in the form of an axially expandable corrugated tube is arranged in the outlet 73 of the large section 77 such that it automatically closes its outlet 73 when a predetermined temperature is reached.

Claims (10)

Verfahren zum kontrollierten Regenerieren eines Dieselrußfilters eines Dieselmotors, wobei der Abgasstrom durch den Dieselrußfilter in Abhängigkeit von der Abgastemperatur hinter dem Dieselrußfilter gedrosselt wird, dadurch gekennzeichnet, daß der Dieselrußfilter in mehrere, parallel in den Abgastrakt eingeschaltete Abschnitte unterteilt wird, in deren mindestens einem der Abgasdurchsatz in Abhängigkeit von der Abgastemperatur hinter dem Dieselrußfilter gedrosselt oder ganz gesperrt wird.Method for the controlled regeneration of a diesel soot filter of a diesel engine, the exhaust gas flow through the diesel soot filter being throttled as a function of the exhaust gas temperature behind the diesel soot filter, characterized in that the diesel soot filter is divided into a plurality of sections connected in parallel in the exhaust gas tract, in at least one of which the exhaust gas throughput is throttled or completely blocked depending on the exhaust gas temperature behind the diesel soot filter. Vorrichtung zum kontrollierten Regenerieren des Dieselrußfilters eines Dieselmotors, bei der eine durch die Abgastemperatur hinter dem Dieselrußfilter gesteuerte Drosselvorrichtung vorgesehen ist, dadurch gekennzeichnet, daß der Dieselrußfilter in mindestens zwei parallel geschaltete Abschnitte (2-6; 16-22; 52, 57; 62, 67; 72, 77) unterteilt ist, von denen mindestens einer durch eine Drosselvorrichtung (10-14; 24-30; 40; 64; 74) teilweise oder ganz absperrbar ist, die durch die Abgastemperatur hinter dem Dieselrußfilter gesteuert ist.Device for the controlled regeneration of the diesel soot filter of a diesel engine, in which one through the Exhaust gas temperature is provided behind the throttle device controlled by the diesel soot filter, characterized in that the diesel soot filter is divided into at least two sections (2-6; 16-22; 52, 57; 62, 67; 72, 77) connected in parallel, at least one of which is divided by a throttle device (10-14; 24-30; 40; 64; 74) can be partially or completely shut off, which is controlled by the exhaust gas temperature behind the diesel soot filter. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß den einzelnen Abschnitten (2-6; 16-22) jeweils eigene Drosselvorrichtungen (10-14; 24-30) im Einlaß (5a, 5b, 5c) und eigene Temperaturmeßvorrichtungen (9-13; 32-38) im Auslaß (7a, 7b, 7c) zugeordnet sind.Device according to claim 2, characterized in that the individual sections (2-6; 16-22) each have their own throttle devices (10-14; 24-30) in the inlet (5a, 5b, 5c) and their own temperature measuring devices (9-13; 32-38) in the outlet (7a, 7b, 7c) are assigned. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der eine Abschnitt (52; 62; 72) der mindestens zwei getrennten Abschnitte (52, 57; 62, 67; 72, 77) unbehindert vom Abgas durchströmt ist, während der andere Abschnitt (57; 67; 77) durch ein Absperrorgan (40; 64; 74) in Abhängigkeit von der im Auslaß herrschenden Temperatur teilweise oder ganz absperrbar ist.Apparatus according to claim 2, characterized in that the one section (52; 62; 72) of the at least two separate sections (52, 57; 62, 67; 72, 77) is flowed through unhindered by the exhaust gas, while the other section (57; 67; 77) can be partially or completely shut off by a shut-off device (40; 64; 74) depending on the temperature prevailing in the outlet. Vorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß eine elektronische Steuereinheit (100) vorgesehen ist, welche das oder jedes Absperrorgan (10-14; 24-30; 40) bei Überschreiten einer vorbestimmten Temperatur im zugehörigen Auslaß (7a, 7b, 7c; 53) des betreffenden Abschnittes individuell zum teilweisen oder gänzlichen Absperren betätigt.Apparatus according to claim 3 or 4, characterized in that an electronic control unit (100) is provided which controls the or each shut-off device (10-14; 24-30; 40) when a predetermined temperature is exceeded in the associated outlet (7a, 7b, 7c ; 53) of the section concerned individually to partially or completely shut off. Vorrichtung nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß Temperatursensoren (T1, T2) in den Auslässen beider Abschnitte (52, 57) angeordnet sind und daß das im Einlaß (50) des größeren Abschnittes (57) vorgesehene Absperrorgan (40) unabhängig davon betätigt wird, welcher der beiden Temperatursensoren ein Überschreiten der zulässigen Temperatur erfaßt.Device according to claim 4 or 5, characterized in that that temperature sensors (T1, T2) are arranged in the outlets of both sections (52, 57) and that the shut-off device (40) provided in the inlet (50) of the larger section (57) is actuated regardless of which of the two temperature sensors exceed the permissible temperature detected. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß ein selbsttätig bei Überschreiten einer vorgegebenen Abgastemperatur wirksam werdendes Absperrorgan (64; 74) im Auslaß (63; 73) des größeren Abschnittes (67: 77)angeordnet ist.Apparatus according to claim 4, characterized in that a shut-off device (64; 74) which takes effect automatically when a predetermined exhaust gas temperature is exceeded is arranged in the outlet (63; 73) of the larger section (67: 77). Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß das Absperrorgan (64; 74) ein Wellrohr ist, welches eine abgeschlossene Füllung aus einem Stoff, insbesondere Natrium, aufweist, der bei Überschreiten der vorgegebenen Temperatur verdampft.Apparatus according to claim 7, characterized in that the shut-off device (64; 74) is a corrugated tube which has a closed filling made of a substance, in particular sodium, which evaporates when the predetermined temperature is exceeded. Vorrichtung nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß die beiden Abschnitte (72, 77) Teile eines Monolithen bilden.Device according to claim 7 or 8, characterized in that the two sections (72, 77) form parts of a monolith. Vorrichtung nach einen der Ansprüche 2 bis 9, dadurch gekennzeichnet, daß kein den Dieselrußfilter umgehender By-Pass vorgesehen ist.Device according to one of claims 2 to 9, characterized in that no by-pass is provided which bypasses the diesel soot filter.
EP95109133A 1994-06-29 1995-06-13 Process and device for controllably regenerating a diesel soot filter Expired - Lifetime EP0690210B1 (en)

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FR2865239A1 (en) * 2004-01-19 2005-07-22 Jean Claude Fayard System for the filtration of exhaust gases from diesel motors by the association of a combustion additive in nanoparticle form and a surface particle filter

Also Published As

Publication number Publication date
JPH0849523A (en) 1996-02-20
CA2152094A1 (en) 1995-12-30
EP0690210B1 (en) 1998-11-04
US5582002A (en) 1996-12-10
AU680359B2 (en) 1997-07-24
CN1116272A (en) 1996-02-07
ATE173051T1 (en) 1998-11-15
AU2163095A (en) 1996-01-11
BR9502975A (en) 1996-06-25

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