DE10357893A1 - Oxidizing catalyst with variable activity - Google Patents

Oxidizing catalyst with variable activity Download PDF

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Publication number
DE10357893A1
DE10357893A1 DE10357893A DE10357893A DE10357893A1 DE 10357893 A1 DE10357893 A1 DE 10357893A1 DE 10357893 A DE10357893 A DE 10357893A DE 10357893 A DE10357893 A DE 10357893A DE 10357893 A1 DE10357893 A1 DE 10357893A1
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Germany
Prior art keywords
exhaust gas
oxidation
nitrogen dioxide
oxidation catalyst
soot
Prior art date
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DE10357893A
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German (de)
Inventor
Andreas Dr. Lingens
Heiner Dr. Bülte
Rolf Miebach
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Deutz AG
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Deutz AG
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Priority to DE10357893A priority Critical patent/DE10357893A1/en
Priority to DE502004010968T priority patent/DE502004010968D1/en
Priority to AT04029134T priority patent/ATE462874T1/en
Priority to EP04029134A priority patent/EP1541818B1/en
Publication of DE10357893A1 publication Critical patent/DE10357893A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2053—By-passing catalytic reactors, e.g. to prevent overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/011—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/0231—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • F01N3/033—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 in combination with other devices
    • F01N3/035—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 in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate 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
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • F01N2430/08—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by modifying ignition or injection timing
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1433—Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the system

Abstract

The method for the operating of an exhaust gas cleaning system with a particle filter (4) for the separating of soot from the exhaust gas of a self-igniting internal combustion engine (1) entails the continuous or discontinuous oxidizing of the soot by the use of nitrogen dioxide produced by an oxidation catalyser (3) upstream of the particle filter. The oxidation of the nitrogen monoxide contained in the exhaust gas into nitrogen dioxide is a controlled process, whereby the oxidation may be controlled by the adjustable bypassing of the oxidation catalyser or by the influence of carbon monoxide emission of the engine. An independent claim is included for an exhaust gas cleaning system operated by the aforesaid method.

Description

Die Erfindung betrifft ein Verfahren zum Betreiben einer Abgasreinigungsanlage mit einem Partikelfilter zur Abtrennung von Ruß aus dem Abgas einer selbstzündenden Brennkraftmaschine und mit einem dem Partikelfilter vorgeschalteten Oxidationskatalysator zur Erzeugung von Stickstoffdioxid aus im Abgas enthaltenem Stickstoffmonoxid und wobei der Ruß unter Verwendung des erzeugten Stickstoffdioxids kontinuierlich oder diskontinuierlich oxidiert wird sowie eine entsprechende Vorrichtung.The The invention relates to a method for operating an emission control system with a particulate filter for separating soot from the exhaust of a self-igniting Internal combustion engine and with a particle filter upstream Oxidation catalyst for the production of nitrogen dioxide from in the exhaust gas contained nitric oxide and wherein the carbon black produced using the Nitrogen dioxide oxidized continuously or discontinuously and a corresponding device.

Ein derartiges Verfahren und eine derartige Vorrichtung sind aus der DE 199 23 781 C2 bekannt. Zur Oxidation des Stickstoffmonoxids zu Stickstoffdioxid wird ein Oxidationskatalysator verwendet, während für die Abtrennung des Rußes aus dem Abgasstrom ein Partikelfilter zum Einsatz kommt. Diese beiden Vorrichtungen können miteinander kombiniert sein oder aber auch getrennte Bauteile sein. In jedem Fall sind sie in einem einzigen Gehäuse angeordnet. Speziell wird ein Verfahren angegeben, welches die Oxidation von Ruß mittels Stickstoffdioxid nutzt, jedoch auch bei solchen selbstzündenden Brennkraftmaschinen einsetzbar ist, die aufgrund motorischer Maßnahmen nur eine geringe Rohemission an Stickoxiden aufweisen.Such a method and such a device are known from DE 199 23 781 C2 known. For the oxidation of the nitrogen monoxide to nitrogen dioxide, an oxidation catalyst is used, while for the separation of the soot from the exhaust gas flow, a particulate filter is used. These two devices can be combined with each other or else be separate components. In any case, they are arranged in a single housing. Specifically, a method is given, which uses the oxidation of carbon black by means of nitrogen dioxide, but can also be used in such auto-igniting internal combustion engines, which have due to engine measures only a low raw emission of nitrogen oxides.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Betreiben einer Abgasreinigungsanlage und eine entsprechende Vorrichtung anzugeben, mit denen die Gesamtemissionen einer Brennkraftmaschine vermindert werden.Of the Invention is based on the object, a method for operating specify an exhaust gas purification system and a corresponding device, with which the total emissions of an internal combustion engine reduced become.

Diese Aufgabe wird dadurch gelöst, dass die Oxidation des Stickstoffoxids zu Stickstoffdioxid in dem Oxidationskatalysator gesteuert wird. Die entsprechende Vorrichtung zeichnet sich dadurch aus, dass der Oxidationskatalysator gesteuert über eine Umgehungsleitung passierbar ist. In einer alternativen Ausführung der Vorrichtung ist keine Umgehungsleitung zu dem Oxidationskatalysator vorgesehen, dafür wird die Aktivität des Oxidationskatalysators durch die Abstimmung der Kraftstoff-Einspritzung in die Brennräume oder ins Abgassystem der Brennkraftmaschine gesteuert. Durch diese Steuerung liefert der Oxidationskatalysator in allen Betriebspunkten eine hinreichend hohe Stickstoffdioxid-Konzentration, die so eingestellt wird, dass eine vollständige Oxidation des im Partikelfilter gesammelten Rußes erreicht wird, ohne dass ein Überschuss von Stickstoffdioxid in die Umgebung emittiert wird.These Task is solved by that the oxidation of the nitrogen oxide to nitrogen dioxide in the Oxidation catalyst is controlled. The corresponding device is characterized in that the oxidation catalyst controlled by a bypass line is passable. In an alternative embodiment of the device is no Provided bypass to the oxidation catalyst, this is the activity of the oxidation catalyst by tuning the fuel injection in the combustion chambers or controlled in the exhaust system of the internal combustion engine. Through this Control supplies the oxidation catalyst in all operating points a sufficiently high nitrogen dioxide concentration, so adjusted that will be a complete one Oxidation of the collected in the particulate filter carbon black is achieved without that a surplus emitted by nitrogen dioxide into the environment.

Die Nullemission von Stickstoffdioxid in die Umgebung ist anzustreben, da Stickstoffdioxid ein aktives Atemgift mit einem sehr niedrigen MAK-Wert (maximale Arbeitsplatzkonzentration) ist. Das Stickstoffdioxid wird aber – wie ausgeführt – andererseits zur Rußoxidation in dem Partikelfilter benötigt und bei einer optimalen Abstimmung bei der Rußverbrennung zumindest weitgehend wieder vollständig zu Stickstoffmonoxid umgewandelt. Dieses System kann insbesondere bei kontinuierlich regenerierenden Partikelfiltern eingesetzt werden.The Zero emission of nitrogen dioxide into the environment is to be strived for, Nitrogen dioxide is an active respiratory poison with a very low MAK value (maximum workplace concentration) is. The nitrogen dioxide but will - like executed - on the other hand to soot oxidation needed in the particle filter and at least largely at optimum tuning during soot combustion completely again converted to nitric oxide. In particular, this system can be used in continuously regenerating particulate filters.

Bei der Einstellung der Stickstoffdioxidkonzentration sind die nachfolgenden Gegebenheiten zu berücksichtigen:
Der Oxidationskatalysator hat zu Beginn (Neuzustand) die höchste Aktivität, die im Laufe der Zeit nachlässt. Gleichzeitig hat die Brennkraftmaschine am Anfang (Neuzustand) die niedrigste Rußemission, die im Laufe der Zeit aber höher wird. Somit existieren zwei gegenläufige, sich nicht ausgleichende Alterungsprozesse.When adjusting the nitrogen dioxide concentration, the following conditions must be taken into account:
The oxidation catalyst at the beginning (new state) has the highest activity, which decreases over time. At the same time, the engine has the lowest soot emission at the beginning (new condition), but becomes higher over time. Thus, there are two opposing, non-balancing aging processes.

Weiterhin kann eine zeitweilige Verschlechterung des Oxidationskatalysators auftreten. Dieses ist beispielsweise bei Verwendung von einem Kraftstoff mit einem erhöhten Schwefelgehalt der Fall.Farther may be a temporary deterioration of the oxidation catalyst occur. This is for example when using a fuel with an elevated Sulfur content of the case.

Bei einem (akuten) Regenerationsbedarf des Partikelfilters kann eine bewusste Erhöhung der Aktivität des Oxidationskatalysators (hohe Stickstoffdioxidwerte sind erwünscht) nötig sein.at an (acute) regeneration needs of the particulate filter can a conscious increase the activity of the oxidation catalyst (high nitrogen dioxide levels are desired).

Die bekannten Stickstoffdioxidspitzenwerte, die bei bestimmten Kombinationen von Oxidationskatalysatortemperatur, Motorlast und Motordrehzahl auftreten können, sind zu vermeiden.The known nitrogen dioxide levels, which in certain combinations of oxidation catalyst temperature, engine load and engine speed occur can, should be avoided.

Ebenso sind hohe Stickstoffdioxidemissionswerte bei niedriger Fahrzeuggeschwindigkeit und im Stillstand des Fahrzeugs, die allesamt Zustände mit geringer natürlicher Verdünnung der Abgase am Endrohr darstellen, zu vermeiden. Dabei können Emissionen in einer sensiblen Umgebung durch Nutzung von GPS-Informationen vermieden werden.As well are high nitrogen dioxide emissions at low vehicle speed and at standstill of the vehicle, all of which states lower naturally dilution represent the exhaust gases at the tailpipe, to avoid. This can be emissions in a sensitive environment by using GPS information be avoided.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind der Zeichnungsbeschreibung zu entnehmen, in der ein in der Figur dargestelltes Ausführungsbeispiel der Erfindung näher beschrieben ist. Das von einer Brennkraftmaschine 1 emittierte Abgas wird über eine Abgasleitung 2a einem Oxidationskatalysator 3 zugeführt, durchströmt diesen und wird über weiterführende Abgasleitungen 2b, 2c einem Partikelfilter 4 zugeführt. Dieser Partikelfilter 4 ist als kontinuierlich oder diskontinuierlich regenerierender Partikelfilter 4 ausgebildet, das heißt, die aus dem Abgas ausgefilterten (Ruß-) Partikel werden kontinuierlich oder diskontinuierlich oxidiert. Diese Oxidation erfolgt im Partikelfilter 4 unter gleichzeitiger Umwandlung von Stickstoffdioxid zu Stickstoffmonoxid, wobei die beiden Prozesse direkt voneinander abhängig sind.Further advantageous embodiments of the invention are described in the drawings, in which an illustrated in the figure embodiment of the invention is described in detail. That of an internal combustion engine 1 emitted exhaust gas is via an exhaust pipe 2a an oxidation catalyst 3 supplied, flows through this and is via further exhaust pipes 2 B . 2c a particle filter 4 fed. This particle filter 4 is as a continuous or discontinuous regenerating particulate filter 4 formed, that is, the filtered out of the exhaust gas (soot) particles are oxidized continuously or discontinuously. These Oxidation takes place in the particle filter 4 with simultaneous conversion of nitrogen dioxide to nitric oxide, the two processes being directly interdependent.

Die Kenntnis dieser Abhängigkeit wird bei der Steuerung der Umwandlung von Stickstoffmonoxid zu Stickstoffdioxid in dem Oxidationskatalysator 3 beispielsweise durch sensormäßige Erfassung geeigneter Parameter (Brennkraftmaschinendrehzahl, Einspritzmengenwerte, Lastwerte, Abgastemperatur, Stickstoffdioxidkonzentration) und/oder dem Einsatz von elektronischen Steuerungen unter Verwendung von abgespeicherten Kennfeldern genutzt.Knowledge of this dependence becomes important in controlling the conversion of nitrogen monoxide to nitrogen dioxide in the oxidation catalyst 3 For example, by sensor-appropriate detection of suitable parameters (engine speed, injection quantity values, load values, exhaust gas temperature, nitrogen dioxide concentration) and / or the use of electronic controls using stored maps used.

Wie ausgeführt, ist der Anteil an überschüssigem Stickstoffdioxid, der über die Abgasleitung 2d in die Umgebung emittiert wird, durch die Steuerung der Oxidation des Stickstoffmonoxids zu Stickstoffdioxid in dem Oxidationskatalysator 3 gering zu halten. Diese Steuerung erfolgt dadurch, dass zu dem Oxidationskatalysator 3 eine Umgehungsleitung 2e existiert, über die der Oxidationskatalysator gesteuert umgehbar ist. Dabei kann in die Umgehungsleitung 2e ein weiterer Oxidationskatalysator 3a eingesetzt sein, der eine andere Abstimmung, beispielsweise eine geringere Aktivität in Bezug auf die Stickstoffdioxiderzeugung aufweist. Alternativ zu der Umgehungsleitung 2e kann durch eine Abstimmung der Kraftstoffeinspritzung die Kohlenstoffmonoxidemission der Brennkraftmaschine gesteuert werden, da diese wiederum direkt die Umwandlung von Stickstoffmonoxid zu Stickstoffdioxid beeinflusst.As stated, the proportion of excess nitrogen dioxide that passes through the exhaust pipe 2d into the environment by controlling the oxidation of the nitrogen monoxide to nitrogen dioxide in the oxidation catalyst 3 to keep low. This control is accomplished by adding to the oxidation catalyst 3 a bypass line 2e exists, over which the oxidation catalyst is controlled bypassed. It can be in the bypass line 2e another oxidation catalyst 3a be used, which has a different vote, for example, a lower activity in terms of nitrogen dioxide production. Alternative to the bypass 2e For example, by tuning the fuel injection, the carbon monoxide emission of the internal combustion engine can be controlled, since this in turn directly influences the conversion of nitrogen monoxide to nitrogen dioxide.

11
BrennkraftmaschineInternal combustion engine
2a, 2c, 2d2a, 2c, 2d
weiterführende Abgasleitungfurther exhaust pipe
2b2 B
Umgehungsleitungbypass line
3, 3a3, 3a
Oxidationskatalysatoroxidation catalyst
44
Partikelfilterparticulate Filter

Claims (6)

Verfahren zum Betreiben einer Abgasreinigungsanlage mit einem Partikelfilter zur Abtrennung von Ruß aus dem Abgas einer selbstzündenden Brennkraftmaschine und mit einem dem Partikelfilter vorgeschalteten Oxidationskatalysator zur Erzeugung von Stickstoffdioxid aus im Abgas enthaltenem Stickstoffmonoxid und wobei der Ruß unter Verwendung des erzeugten Stickstoffdioxids kontinuierlich oder diskontinuierlich oxidiert wird, dadurch gekennzeichnet, dass die Oxidation des Stickstoffmonoxids zu Stickstoffdioxid gesteuert wird.The method of the soot using the nitrogen dioxide produced is continuously or batchwise oxidized to operate an emission control system with a particulate trap for the separation of soot from the exhaust gas of an auto-ignition internal combustion engine and with an upstream the particulate oxidation catalyst to produce nitrogen dioxide contained in the exhaust gas nitric oxide, and wherein, characterized characterized in that the oxidation of the nitrogen monoxide is controlled to nitrogen dioxide. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Oxidation durch eine einstellbare Umgehung des Oxidationskatalysators (3) gesteuert wird.A method according to claim 1, characterized in that the oxidation by an adjustable bypass of the oxidation catalyst ( 3 ) is controlled. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Oxidation durch eine Beeinflussung der Kohlenstoffmonoxidemission der Brennkraftmaschine gesteuert wird.Method according to claim 1, characterized in that that the oxidation by influencing the carbon monoxide emission the internal combustion engine is controlled. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass die Kohlenstoffmonoxidemission und Stickstoffmonoxidemission durch die Abstimmung der Kraftstoff-Einspritzung in zumindest einen Brennraum oder die Abgasanlage der Brennkraftmaschine beeinflusst wird.Method according to claim 3, characterized that the carbon monoxide emission and nitrogen monoxide emission by tuning the fuel injection into at least one combustion chamber or the exhaust system of the internal combustion engine is affected. Abgasreinigungsanlage mit einem Partikelfilter zur Abtrennung von Ruß aus dem Abgas einer selbstzündenden Brennkraftmaschine und mit einem dem Partikelfilter vorgeschalteten Oxidationskatalysator zur Erzeugung von Stickstoffdioxid aus im Abgas enthaltenem Stickstoffmonoxid und wobei der Ruß unter Verwendung des erzeugten Stickstoffdioxids kontinuierlich oder diskontinuierlich oxidiert wird, dadurch gekennzeichnet, dass der Oxidationskatalysator (3) steuerbar über eine Umgehungsleitung (2e) passierbar ist.Emission control system with a particulate filter for separating soot from the exhaust gas of a self-igniting internal combustion engine and with an oxidation catalyst upstream of the particulate filter for generating nitrogen dioxide from nitrogen monoxide contained in the exhaust gas and wherein the soot is oxidized continuously or discontinuously using the nitrogen dioxide produced, characterized in that the Oxidation catalyst ( 3 ) controllable via a bypass ( 2e ) is passable. Abgasreinigungsanlage nach Anspruch 5, dadurch gekennzeichnet, dass in die Umgehungsleitung (2e) ein weiterer Oxidationskatalysator (3a) mit einer zu dem ersten Oxidationskatalysator (3) unterschiedlichen Aktivität eingeschaltet ist.Exhaust gas purification system according to claim 5, characterized in that in the bypass line ( 2e ) another oxidation catalyst ( 3a ) with a to the first oxidation catalyst ( 3 ) different activity is turned on.
DE10357893A 2003-12-11 2003-12-11 Oxidizing catalyst with variable activity Withdrawn DE10357893A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE10357893A DE10357893A1 (en) 2003-12-11 2003-12-11 Oxidizing catalyst with variable activity
DE502004010968T DE502004010968D1 (en) 2003-12-11 2004-12-09 Oxidizing catalyst with variable activity
AT04029134T ATE462874T1 (en) 2003-12-11 2004-12-09 OXIDATION CATALYST WITH VARIABLE ACTIVITY
EP04029134A EP1541818B1 (en) 2003-12-11 2004-12-09 Oxidation catalyst with variable activity

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EP1057519A1 (en) * 1999-05-18 2000-12-06 Kemira Metalkat Oy Purification system for diesel engine exhaust gases
DE19961166A1 (en) * 1999-12-17 2001-06-21 Volkswagen Ag Method and device for reducing harmful components in the exhaust gas of an internal combustion engine
DE10130633A1 (en) * 2001-06-26 2003-01-02 Man Nutzfahrzeuge Ag Continuous process for cleaning a particle filter coupled with an oxidation catalyzer, used for particle filters in diesel engines, involves analyzing the amount of carbon black
US20030089104A1 (en) * 2001-11-13 2003-05-15 Christophe Colignon System for helping to regenerate a catalysed particulate filter arranged in a motor vehicle diesel engine exhaust line

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EP1541818A1 (en) 2005-06-15
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ATE462874T1 (en) 2010-04-15

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