EP1815113A1 - Oxidation catalyst and particulate filter - Google Patents

Oxidation catalyst and particulate filter

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Publication number
EP1815113A1
EP1815113A1 EP05809778A EP05809778A EP1815113A1 EP 1815113 A1 EP1815113 A1 EP 1815113A1 EP 05809778 A EP05809778 A EP 05809778A EP 05809778 A EP05809778 A EP 05809778A EP 1815113 A1 EP1815113 A1 EP 1815113A1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
oxidation
particulate filter
oxidation catalyst
catalyst
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
EP05809778A
Other languages
German (de)
French (fr)
Other versions
EP1815113B1 (en
Inventor
Rolf Miebach
Heiner BÜLTE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutz AG
Original Assignee
Deutz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deutz AG filed Critical Deutz AG
Publication of EP1815113A1 publication Critical patent/EP1815113A1/en
Application granted granted Critical
Publication of EP1815113B1 publication Critical patent/EP1815113B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts

Definitions

  • the invention relates to a method for operating an exhaust gas purification system with a particle filter switched on in an exhaust gas line for separating soot from the exhaust gas of a self-igniting internal combustion engine and with an oxidation catalytic converter upstream of the particle filter for removing the particle collected in the particle filter soot.
  • the oxidation catalyst is used for converting hydrocarbon and carbon monoxide into water and carbon dioxide, while a particle filter arranged downstream of the oxidation catalyst is used for the separation of the carbon black from the exhaust gas stream.
  • a temperature increase of the exhaust gas is achieved. This temperature is further increased by a post-injection of fuel.
  • a method for controlling the post-injection depending on the oxidation catalyst and the loading state of the particulate filter is specified.
  • the invention is based on the object of specifying a method for operating an exhaust gas purification system and a corresponding device with which the total emissions of an internal combustion engine are reduced.
  • This object is achieved in that the oxidation rate of the oxidation dationskatalysators variable and / or the oxidation catalyst from the exhaust line can be suppressed.
  • the function of the oxidation catalytic converter is therefore to increase the exhaust gas temperature by the oxidation of hydrocarbons (exothermic catalytic converter). This provides a contribution to the required exhaust gas temperature for the periodic regeneration of the particulate filter with O 2 contained in the exhaust gas. Since the elevated temperature should prevail only during the phase of regeneration in the exhaust system, the oxidation catalyst is suppressed from the exhaust line and displayed again.
  • the oxidation rate can therefore be varied between no oxidation and maximum oxidation, or the oxidation catalyst can be bypassed, for example, by way of a bypass line.
  • the variable activity of the oxidation catalyst is used to dampen the activity of the oxidation catalyst outside the regeneration phases of the particulate filter. As a result, unwanted side reactions, such as those of NO to NO 2 and of SO 3 to SO 4 avoided or reduced.
  • the exhaust gas temperature is variable by a controlled operation of the oxidation catalyst upstream pilot burner, in particular can be increased.
  • the exhaust gas temperature can be additionally increased, in particular in operating states in which the previously described measures of increasing the temperature (for example, at low partial load) are insufficient.
  • the pilot burner is always used only at maximum effective oxidation catalyst.
  • the exhaust gas emitted by an internal combustion engine 1 is supplied to an oxidation catalytic converter 3 via an exhaust gas line 2a, flows through it and is supplied to a particle filter 4 via further exhaust gas lines 2b, 2c.
  • This particle filter 4 is designed as a discontinuously regenerating particle filter 4, that is to say that the (soot) particles which have been filtered out of the exhaust gas are burnt off discontinuously. This burning off takes place in the particle filter 4 by increasing the exhaust gas temperature to about 600 ° C.
  • This increase in the exhaust gas temperature is achieved by oxidizing oxidation of CO and HC to H 2 O and CO 2 in the oxidation catalyst.
  • the oxidation rate of the oxidation catalytic converter can be varied and / or the oxidation catalytic converter can be suppressed from the exhaust gas line.
  • a bypass line 2e exists, via which the Oxidations ⁇ catalyst is bypassed controlled.
  • a further oxidation catalyst 3a may optionally be used in the bypass line 2e, which has a different tuning and reduces other emissions in the exhaust gas, for example HC, CO, HC particles.
  • the exhaust-gas temperature can also be varied, in particular increased, by a controlled operation of a pilot burner arranged upstream of the oxidation catalytic converter.
  • the exhaust gas temperature can be additionally increased, in particular in operating states in which the previously described measures for increasing the temperature (for example, at low partial load) are insufficient.
  • the control of the oxidation rate and / or the suppression and superimposition takes place, for example, by sensor-appropriate detection of suitable parameters (engine speed, injection quantity). genute, load values, exhaust gas temperature, nitrogen dioxide concentration) and / or the use of electronic controls using Verwen ⁇ stored memory maps.
  • suitable parameters engine speed, injection quantity
  • Verwen ⁇ stored memory maps As an alternative to the bypass line 2e, the carbon monoxide emission of the internal combustion engine can be controlled by tuning the fuel injection, since this in turn directly influences the conversion of nitrogen monoxide to nitrogen dioxide.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

The invention relates to a method for operating an emission control system comprising a particulate filter (4) for eliminating soot from the exhaust gas of a self-igniting internal combustion engine and an oxidation catalyst (3) that is mounted upstream of the particulate filter (4) and is used for removing the soot collected in the particulate filter (4). The aim of the invention is to create a method for operating an emission control system and a corresponding device which allow the total emissions of an internal combustion engine to be reduced. Said aim is achieved by oxidizing CO and HC to H<SUB>2</SUB>O and CO<SUB>2</SUB> in the oxidation catalyst (3) in order to increase the exhaust gas temperature and thus burn the soot collected in the particulate filter (4) while the oxidation rate of the oxidation catalyst (3) can be varied and/or the oxidation catalyst (3) can be disconnected from the exhaust manifold.

Description

Oxidationskatalysator und Partikelfilter Oxidation catalyst and particle filter
B E S C H R E I B U N GDESCRIPTION
Die Erfindung betrifft ein Verfahren zum Betreiben einer Abgasreini¬ gungsanlage mit einem in einem Abgasstrang eingeschalteten Par¬ tikelfilter zur Abtrennung von Ruß aus dem Abgas einer selbstzün¬ denden Brennkraftmaschine und mit einem dem Partikelfilter vorge- schalteten Oxidationskatalysator zur Entfernung des in dem Partikel¬ filter gesammelten Rußes.The invention relates to a method for operating an exhaust gas purification system with a particle filter switched on in an exhaust gas line for separating soot from the exhaust gas of a self-igniting internal combustion engine and with an oxidation catalytic converter upstream of the particle filter for removing the particle collected in the particle filter soot.
Ein derartiges Verfahren ist aus der DE 199 52 830 A1 bekannt. Ge¬ mäß diesem Dokument wird der Oxidationskatalysator zur Umsetzung von Kohlenwasserstoff und Kohlenmonoxid zu Wasser und Kohlendi¬ oxid verwendet, während für die Abtrennung des Rußes aus dem Ab¬ gasstrom ein dem Oxidationskatalysator nachgeschalteter Partikelfil¬ ter zum Einsatz kommt. Mit der in dem Oxidationskatalysator stattfin¬ denden Umsetzung wird eine Temperaturerhöhung des Abgases er- reicht. Diese Temperatur wird durch eine Nacheinspritzung von Kraft¬ stoff weiter erhöht. Speziell wird ein Verfahren zur Steuerung der Nacheinspritzung in Abhängigkeit des Oxidationskatalysators und dem Beladungszustand des Partikelfilters angegeben.Such a method is known from DE 199 52 830 A1. According to this document, the oxidation catalyst is used for converting hydrocarbon and carbon monoxide into water and carbon dioxide, while a particle filter arranged downstream of the oxidation catalyst is used for the separation of the carbon black from the exhaust gas stream. With the reaction taking place in the oxidation catalyst, a temperature increase of the exhaust gas is achieved. This temperature is further increased by a post-injection of fuel. Specifically, a method for controlling the post-injection depending on the oxidation catalyst and the loading state of the particulate filter is specified.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Betrei¬ ben einer Abgasreinigungsanlage und eine entsprechende Vorrich¬ tung anzugeben, mit denen die Gesamtemissionen einer Brennkraft¬ maschine vermindert werden. Diese Aufgabe wird dadurch gelöst, dass die Oxidationsrate des Oxi- dationskatalysators variierbar und/oder der Oxidationskatalysator aus dem Abgasstrang ausblendbar ist. Die Funktion des Oxidationskata- lysators ist es also, durch die Oxidation von Kohlenwasserstoffen die Abgastemperatur zu erhöhen (Exothermiekat). Damit wird ein Beitrag zur benötigten Abgastemperatur für die periodische Regeneration des Partikelfilters mit im Abgas enthaltenen O2 geliefert. Da die erhöhte Temperatur nur während der Phase der Regeneration in Abgasstrang herrschen soll, wird der Oxidationskatalysator aus dem Abgasstrang ausgeblendet und wieder eingeblendet. Dies erfolgt kontinuierlich re¬ gelbar. Die Oxidationsrate ist also zwischen keiner Oxidation und ma¬ ximaler Oxidation variierbar oder der Oxidationskatalysator ist bei¬ spielsweise über eine Bypassleitung gesteuert umgehbar. Die vari¬ able Aktivität des Oxidationskatalysators wird eingesetzt, um außer- halb der Regenerationsphasen des Partikelfilters die Aktivität des Oxidationskatalysators zu dämpfen. Dadurch werden unerwünschte Nebenreaktionen, wie beispielsweise die von NO zu NO2 und von SO3 zu SO4 vermieden beziehungsweise reduziert.The invention is based on the object of specifying a method for operating an exhaust gas purification system and a corresponding device with which the total emissions of an internal combustion engine are reduced. This object is achieved in that the oxidation rate of the oxidation dationskatalysators variable and / or the oxidation catalyst from the exhaust line can be suppressed. The function of the oxidation catalytic converter is therefore to increase the exhaust gas temperature by the oxidation of hydrocarbons (exothermic catalytic converter). This provides a contribution to the required exhaust gas temperature for the periodic regeneration of the particulate filter with O 2 contained in the exhaust gas. Since the elevated temperature should prevail only during the phase of regeneration in the exhaust system, the oxidation catalyst is suppressed from the exhaust line and displayed again. This is done continuously re¬ gelbar. The oxidation rate can therefore be varied between no oxidation and maximum oxidation, or the oxidation catalyst can be bypassed, for example, by way of a bypass line. The variable activity of the oxidation catalyst is used to dampen the activity of the oxidation catalyst outside the regeneration phases of the particulate filter. As a result, unwanted side reactions, such as those of NO to NO 2 and of SO 3 to SO 4 avoided or reduced.
In weiterer Ausgestaltung der Erfindung ist die Abgastemperatur durch ein gesteuertes Betreiben eines dem Oxidationskatalysator vorgeschalteten Zündbrenners variierbar, insbesondere erhöhbar. Mit dem Einsatz des Zündbrenners kann insbesondere in Betriebszu- ständen, in denen die zuvor geschilderten Maßnahmen der Tempe- raturerhöhung (beispielsweise bei unterer Teillast) nicht ausreichen, die Abgastemperatur zusätzlich erhöht werden. Der Zündbrenner wird aber immer nur bei maximal wirksamen Oxidationskatalysator einge¬ setzt.In a further embodiment of the invention, the exhaust gas temperature is variable by a controlled operation of the oxidation catalyst upstream pilot burner, in particular can be increased. With the use of the pilot burner, the exhaust gas temperature can be additionally increased, in particular in operating states in which the previously described measures of increasing the temperature (for example, at low partial load) are insufficient. However, the pilot burner is always used only at maximum effective oxidation catalyst.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind der Zeich¬ nungsbeschreibung zu entnehmen, in der ein in der einzigen Figur dargestelltes Ausführungsbeispiel näher beschrieben ist. Das von einer Brennkraftmaschine 1 emittierte Abgas wird über eine Abgasleitung 2a einem Oxidationskatalysator 3 zugeführt, durch¬ strömt diesen und wird über weiterführende Abgasleitungen 2b, 2c einem Partikelfilter 4 zugeführt. Dieser Partikelfilter 4 ist als diskonti- nuierlich regenerierender Partikelfilter 4 ausgebildet, das heißt, die aus dem Abgas ausgefilterten (Ruß-) Partikel werden diskontinuier¬ lich abgebrannt. Dieser Abbrennvorgang erfolgt im Partikelfilter 4 durch eine Erhöhung der Abgastemperatur auf ca. 600°C.Further advantageous embodiments of the invention can be found in the drawing description, in which an exemplary embodiment shown in the single figure is described in more detail. The exhaust gas emitted by an internal combustion engine 1 is supplied to an oxidation catalytic converter 3 via an exhaust gas line 2a, flows through it and is supplied to a particle filter 4 via further exhaust gas lines 2b, 2c. This particle filter 4 is designed as a discontinuously regenerating particle filter 4, that is to say that the (soot) particles which have been filtered out of the exhaust gas are burnt off discontinuously. This burning off takes place in the particle filter 4 by increasing the exhaust gas temperature to about 600 ° C.
Diese Erhöhung der Abgastemperatur wird dadurch erreicht, dass in dem Oxidationskatalysator eine Oxidation von Oxidation von CO und HC zu H2O und CO2 erfolgt. Die Oxidationsrate des Oxidationskataly- sators ist variierbar und/oder der Oxidationskatalysator aus dem Ab¬ gasstrang ausblendbar.This increase in the exhaust gas temperature is achieved by oxidizing oxidation of CO and HC to H 2 O and CO 2 in the oxidation catalyst. The oxidation rate of the oxidation catalytic converter can be varied and / or the oxidation catalytic converter can be suppressed from the exhaust gas line.
Die Ausblendung erfolgt in der Form, dass zu dem Oxidationskataly¬ sator 3 eine Umgehungsleitung 2e existiert, über die der Oxidations¬ katalysator gesteuert umgehbar ist. Dabei kann in die Umgehungs¬ leitung 2e gegebenenfalls ein weiterer Oxidationskatalysator 3a ein- gesetzt sein, der eine andere Abstimmung aufweist und andere Emis¬ sionen im Abgas, beispielsweise HC, CO, HC-Partikel verringert.The blanking takes place in the form that to the Oxidationskataly¬ capacitor 3, a bypass line 2e exists, via which the Oxidations¬ catalyst is bypassed controlled. In this case, a further oxidation catalyst 3a may optionally be used in the bypass line 2e, which has a different tuning and reduces other emissions in the exhaust gas, for example HC, CO, HC particles.
Die Abgastemperatur ist bedarfsweise zusätzlich durch ein gesteuer¬ tes Betreiben eines dem Oxidationskatalysator vorgeschalteten Zündbrenners variierbar, insbesondere erhöhbar. Durch den Einsatz dieses Zündbrenners kann insbesondere in Betriebszuständen, in de¬ nen die zuvor geschilderten Maßnahmen zur Temperaturerhöhung (beispielsweise bei unterer Teillast) nicht ausreichen, die Abgastem¬ peratur zusätzlich erhöht werden.If necessary, the exhaust-gas temperature can also be varied, in particular increased, by a controlled operation of a pilot burner arranged upstream of the oxidation catalytic converter. By using this pilot burner, the exhaust gas temperature can be additionally increased, in particular in operating states in which the previously described measures for increasing the temperature (for example, at low partial load) are insufficient.
Die Steuerung der Oxidationsrate und/oder der Ausblendung und Einblendung erfolgt beispielsweise durch sensormäßige Erfassung geeigneter Parameter (Brennkraftmaschinendrehzahl, Einspritzmen- genwerte, Lastwerte, Abgastemperatur, Stickstoffdioxidkonzentration) und/oder den Einsatz von elektronischen Steuerungen unter Verwen¬ dung von abgespeicherten Kennfeldern. Alternativ zu der Umge¬ hungsleitung 2e kann durch eine Abstimmung der Kraftstoffeinsprit¬ zung die Kohlenstoffmonoxidemission der Brennkraftmaschine ge¬ steuert werden, da diese wiederum direkt die Umwandlung von Stick¬ stoffmonoxid zu Stickstoffdioxid beeinflusst. The control of the oxidation rate and / or the suppression and superimposition takes place, for example, by sensor-appropriate detection of suitable parameters (engine speed, injection quantity). genwerte, load values, exhaust gas temperature, nitrogen dioxide concentration) and / or the use of electronic controls using Verwen¬ stored memory maps. As an alternative to the bypass line 2e, the carbon monoxide emission of the internal combustion engine can be controlled by tuning the fuel injection, since this in turn directly influences the conversion of nitrogen monoxide to nitrogen dioxide.
Bezugszeichenliste:LIST OF REFERENCE NUMBERS
1 Brennkraftmaschine1 internal combustion engine
2a, 2b, 2c, 2d weiterführende Abgasleitung2a, 2b, 2c, 2d continuing exhaust pipe
2e Umgehungsleitung2e bypass
3, 3a Oxidationskatalysator3, 3a oxidation catalyst
4 Partikelfilter 4 particle filter

Claims

A N S P R Ü C H E
1. Verfahren zum Betreiben einer Abgasreinigungsanlage mit einem in einem Abgasstrang eingeschalteten Partikelfilter zur Abtrennung von Ruß aus dem Abgas einer selbstzündenden Brennkraftmaschine und mit einem dem Partikelfilter vorgeschalteten Oxidationskataly- sator zur Oxidation von CO und HC zu H2O und CO2 zum Zweck der Abgastemperaturerhöhung, wobei durch die Erhöhung der Abgastem¬ peratur der in dem Partikelfilter gesammelte Ruß abgebrannt wird, dadurch gekennzeichnet, dass die Oxidationsrate des Oxidationska- talysators variierbar und/oder der Oxidationskatalysator aus dem Ab- gasstrang ausblendbar ist.1. A method for operating an exhaust gas purification system with a switched on in an exhaust gas particulate filter for separating soot from the exhaust gas of a self-igniting internal combustion engine and with a particulate filter upstream Oxidationskataly- sator for the oxidation of CO and HC to H 2 O and CO 2 for the purpose of exhaust gas temperature increase in which the soot collected in the particulate filter is burnt off by increasing the exhaust gas temperature, characterized in that the oxidation rate of the oxidation catalyst can be varied and / or the oxidation catalyst can be suppressed from the exhaust gas stream.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Oxidationsrate zwischen "keine Oxidation" und "maximale Oxidation" variierbar ist.2. The method according to claim 1, characterized in that the oxidation rate between "no oxidation" and "maximum oxidation" is variable.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Oxidationskatalysator über eine Bypassleitung gesteuert umgehbar ist.3. The method according to claim 1 or 2, characterized in that the oxidation catalyst is bypassed controlled via a bypass line.
4. Verfahren nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Abgastemperatur zusätzlich durch ein gesteuertes Betreiben eines dem Oxidationskatalysator vorge¬ schalteten Zündbrenners variierbar, insbesondere erhöhbar ist. 4. The method according to any one of the preceding claims, characterized in that the exhaust gas temperature in addition by a controlled operation of the oxidation catalyst vorge¬ switched pilot burner is variable, in particular can be increased.
5. Abgasreinigungsanlage mit einem in einem Abgasstrang einge¬ schalteten Partikelfilter zur Abtrennung von Ruß aus dem Abgas einer selbstzündenden Brennkraftmaschine und mit einem dem Partikelfil¬ ter vorgeschalteten Oxidationskatalysator zur abgastemperaturerhö- henden Oxidation von CO und HC zu H2O und CO2 wobei durch die Erhöhung der Abgastemperatur der in dem Partikelfilter gesammelte Ruß abgebrannt wird, dadurch gekennzeichnet, dass der Oxidationskatalysator (3) über eine Bypassleitung (2e) umgehbar ist.5. An exhaust gas purification system with a particulate filter which is switched on in an exhaust gas line for separating soot from the exhaust gas of a self-igniting internal combustion engine and with an oxidation catalytic converter upstream of the particulate filter for the oxidation of CO and HC to H 2 O and CO 2 with the exhaust gas temperature increasing Increasing the exhaust gas temperature of the soot collected in the particulate filter is burned, characterized in that the oxidation catalyst (3) via a bypass line (2e) is bypassed.
6. Abgasreinigungsanlage nach Anspruch 5, dadurch gekennzeichnet, dass in die Umgehungsleitung (2e) ein wei¬ terer Oxidationskatalysator (3a) mit einer zu dem ersten Oxidations¬ katalysator (3) unterschiedlichen Aktivität eingeschaltet ist.6. An exhaust gas purification system according to claim 5, characterized in that in the bypass line (2e) a wei¬ terer oxidation catalyst (3a) with a to the first Oxidations¬ catalyst (3) different activity is turned on.
7. Abgasreinigungsanlage nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass in den Abgasstrang vor dem Oxida¬ tionskatalysator (3) ein Zündbrenner () eingeschaltet ist. 7. Emission control system according to claim 5 or 6, characterized in that in the exhaust gas upstream of the Oxida¬ tion catalyst (3) a pilot burner () is turned on.
EP05809778A 2004-11-27 2005-11-24 Method for operating an exhaust gas purification system Not-in-force EP1815113B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004057434A DE102004057434A1 (en) 2004-11-27 2004-11-27 Oxidation catalyst and particle filter
PCT/EP2005/012557 WO2006056432A1 (en) 2004-11-27 2005-11-24 Oxidation catalyst and particulate filter

Publications (2)

Publication Number Publication Date
EP1815113A1 true EP1815113A1 (en) 2007-08-08
EP1815113B1 EP1815113B1 (en) 2010-02-10

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EP05809778A Not-in-force EP1815113B1 (en) 2004-11-27 2005-11-24 Method for operating an exhaust gas purification system

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EP (1) EP1815113B1 (en)
AT (1) ATE457415T1 (en)
DE (2) DE102004057434A1 (en)
WO (1) WO2006056432A1 (en)

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JP3089989B2 (en) * 1995-05-18 2000-09-18 トヨタ自動車株式会社 Diesel engine exhaust purification system
JP3250645B2 (en) * 1995-05-24 2002-01-28 日野自動車株式会社 Exhaust gas purification equipment
DE19533355A1 (en) * 1995-09-08 1997-03-13 Wilfried Faerber Treating exhaust gases containing e.g. soot particles
DE10043613A1 (en) * 2000-08-02 2002-02-14 Fev Motorentech Gmbh Filter arrangement, used for cleaning exhaust gases from IC engines, comprises porous particle filter body having catalytically active coating, oxidation catalyst, and adjusting element for adjusting feeds
JP3758617B2 (en) * 2002-07-12 2006-03-22 トヨタ自動車株式会社 Exhaust gas purification device for internal combustion engine
DE10241065A1 (en) * 2002-09-05 2004-03-11 Robert Bosch Gmbh Process and assembly to reduce automotive particle and nitrogen oxides emissions, has catalytic converter operating in parallel with plasma reactor
JP4045935B2 (en) * 2002-11-25 2008-02-13 三菱ふそうトラック・バス株式会社 Exhaust gas purification device for internal combustion engine

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EP1815113B1 (en) 2010-02-10
WO2006056432A1 (en) 2006-06-01
DE502005009005D1 (en) 2010-03-25
ATE457415T1 (en) 2010-02-15
DE102004057434A1 (en) 2006-06-08

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