DE202014103378U1 - Device for exhaust aftertreatment - Google Patents
Device for exhaust aftertreatment Download PDFInfo
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- DE202014103378U1 DE202014103378U1 DE202014103378.5U DE202014103378U DE202014103378U1 DE 202014103378 U1 DE202014103378 U1 DE 202014103378U1 DE 202014103378 U DE202014103378 U DE 202014103378U DE 202014103378 U1 DE202014103378 U1 DE 202014103378U1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—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
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0842—Nitrogen oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
- F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—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
- F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
- F01N3/106—Auxiliary oxidation catalysts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—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
- F01N3/2066—Selective catalytic reduction [SCR]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2510/00—Surface coverings
- F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/08—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a pressure sensor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
Vorrichtung zur Abgasnachbehandlung (21), welche einen Abgaseinlass (1) und einen Abgasauslass (2) umfasst, dadurch gekennzeichnet, dass zwischen dem Abgaseinlass (1) und dem Abgasauslass (2) in Strömungsrichtung (3) des Abgases ein passiver Stickoxidspeicherkatalysator (4) und stromabwärts davon ein Partikelfilter (5) mit SCR-Beschichtung angeordnet ist.Device for exhaust gas aftertreatment (21), which comprises an exhaust gas inlet (1) and an exhaust gas outlet (2), characterized in that between the exhaust gas inlet (1) and the exhaust gas outlet (2) in the flow direction (3) of the exhaust gas, a passive nitrogen oxide storage catalyst (4) and a particle filter (5) with an SCR coating is arranged downstream thereof.
Description
Die vorliegende Erfindung betrifft eine Vorrichtung zur Abgasnachbehandlung, insbesondere zur Reduzierung von Kohlenmonoxid-Emissionen und/oder Kohlenwasserstoff-Emissionen und/oder Stickoxid-Emissionen und/oder Feinstaub-Emissionen und/oder Ruß-Emissionen. The present invention relates to a device for exhaust aftertreatment, in particular for reducing carbon monoxide emissions and / or hydrocarbon emissions and / or nitrogen oxide emissions and / or particulate matter emissions and / or soot emissions.
Die Euro-6-Emissionsnorm erfordert zusätzlich zu der Einhaltung von Grenzwerten im Hinblick auf Kohlenmonoxid, Kohlenwasserstoff und Ruß in Abgasen zusätzlich eine Reduktion von Stickoxiden. Zwei bekannte Stickoxid-Nachbehandlungsmethoden sind die selektive katalytische Reduktion (SCR-selective catalytic reduction) und die Mager-NOx-Falle (LNT – Lean NOx Trap), welche in Form von SCR-Katalysatoren und Stickoxidspeicherkatalysatoren bzw. Stickoxidadsorbern realisiert werden. Beide Technologien erfordern aktive Steuer- und Regelungsmaßnahmen zur Umsetzung des Stickoxids (NOx). The Euro 6 emission standard requires, in addition to compliance with limit values with regard to carbon monoxide, hydrocarbons and soot in exhaust gases, an additional reduction of nitrogen oxides. Two known nitrogen oxide aftertreatment methods are selective catalytic reduction (SCR) and the lean NO x trap (LNT - lean NO x trap), which are realized in the form of SCR catalysts and nitrogen oxide storage catalysts or nitrogen oxide adsorbers. Both technologies require active control and regulatory measures for the conversion of nitrogen oxide (NO x ).
Mager-NOx-Fallen, auch als NOx-Adsorber bekannt, vereinen prinzipiell drei Wirkkomponenten: einen Oxidationskatalysator, zum Beispiel Platin (Pt), ein Adsorptionsmittel, zum Beispiel Barium- und/oder andere Oxide, sowie einen Reduktionskatalysator, zum Beispiel Rhodium (Rh). Die Adsorber sind in die Beschichtung des Katalysators eingebaut und binden im Magerbetrieb des Motors chemisch NOx. Wenn die Adsorber-Kapazität gesättigt ist, wird das System in einer Phase, in der der Motor fett betrieben wird, regeneriert und das freigesetzte NOx über den Katalysator zu Stickstoff reduziert. Lean NO x traps, also known as NO x adsorbers, in principle combine three active components: an oxidation catalyst, for example platinum (Pt), an adsorbent, for example barium and / or other oxides, and a reduction catalyst, for example rhodium (Rh). The adsorbers are incorporated in the coating of the catalyst and chemically bind NO x in the lean operation of the engine. When the adsorber capacity is saturated, the system is regenerated in a phase in which the engine is operated rich and the released NO x is reduced to nitrogen via the catalyst.
In den Dokument
In einigen Anwendungen, wie beispielsweise Personenkraftwagen oder Großraumlimosinen, ist keine der beiden genannten Technologien einzeln dazu in der Lage die Emissionsgrenzwerte zu realisieren. Die SCR-Technologie erfordert die Zusetzung von Ammoniak (NH3) oder das Einspritzen einer wässrigen Harnstoff-Lösung, beispielsweise in Form von AdBlue, zur Reduzierung von Stickoxiden in einem SCR-Katalysator. Im Rahmen der LNT-Technologie wird Stickoxid während magerer Betriebsbedingungen gespeichert und im fetten Betriebsbereich bzw. während fetter Betriebsperioden umgesetzt. Die SCR-Systeme sind für größere und schwerere Fahrzeuge geeignet, funktionieren aber unzureichend während eines Kaltstarts. Wünschenswert ist daher eine Lösung, welche die Stickoxid-Emissionsgrenzwerte basierend auf der SCR-Technologie erreicht, aber ohne weitere aktiv zu steuernden bzw. zu regelnden Nachbehandlungsvorrichtungen auskommt. In some applications, such as passenger cars or large-capacity limousines, neither of the two technologies mentioned is individually capable of implementing the emission limit values. The SCR technology requires the addition of ammonia (NH 3 ) or the injection of an aqueous urea solution, for example in the form of AdBlue, for the reduction of nitrogen oxides in an SCR catalyst. Nitrogen oxide is stored during lean operating conditions in the context of LNT technology and implemented in the rich operating range or during periods of heavy operating periods. The SCR systems are suitable for larger and heavier vehicles, but do not work well during a cold start. It is therefore desirable to have a solution which achieves the nitrogen oxide emission limit values based on the SCR technology, but manages without further aftertreatment devices that are to be actively controlled or regulated.
Aufgabe der vorliegenden Erfindung ist es eine vorteilhafte Vorrichtung zur Abgasnachbehandlung zur Verfügung zu stellen. Eine weitere Aufgabe der vorliegenden Erfindung besteht darin, einen vorteilhaften Katalysator und ein vorteilhaftes Kraftfahrzeug zur Verfügung zu stellen. Diese Aufgaben werden durch eine Vorrichtung gemäß Schutzanspruch 1, einen Katalysator nach Schutzanspruch 8 und ein Kraftfahrzeug nach Schutzanspruch 9 gelöst. Die abhängigen Ansprüche enthalten weitere, vorteilhafte Ausgestaltungen der Erfindung. Object of the present invention is to provide an advantageous device for exhaust aftertreatment available. Another object of the present invention is to provide an advantageous catalyst and an advantageous motor vehicle. These objects are achieved by a device according to protection claim 1, a catalyst according to
Die erfindungsgemäße Vorrichtung zur Abgasnachbehandlung umfasst einen Abgaseinlass, beispielsweise in Form einer Abgaseinlassöffnung, und einen Abgasauslass, beispielsweise in Form einer Abgasauslassöffnung. Zwischen dem Abgaseinlass und dem Abgasauslass sind in Strömungsrichtung des Abgases ein passiver Stickoxidspeicherkatalysator bzw. Stickoxid-Adsorber (passiver LNT) und stromabwärts davon ein Partikelfilter, beispielsweise ein Dieselpartikelfilter (DPF), mit SCR-Beschichtung, also einer Beschichtung zur selektiven katalytischen Reduktion, angeordnet. Der Partikelfilter ist somit stromabwärts des Stickoxidspeicherkatalysators angeordnet. The exhaust gas aftertreatment device according to the invention comprises an exhaust gas inlet, for example in the form of an exhaust gas inlet opening, and an exhaust gas outlet, for example in the form of an exhaust gas outlet opening. Between the exhaust gas inlet and the exhaust gas outlet, a passive nitrogen oxide adsorber (passive LNT) and downstream of it a particle filter, for example a diesel particulate filter (DPF), with SCR coating, ie a coating for selective catalytic reduction, are arranged in the flow direction of the exhaust gas , The particulate filter is thus arranged downstream of the nitrogen oxide storage catalyst.
Der passive Stickoxidspeicherkatalysator bewirkt keine Umsetzung des Stickoxids, sondern adsorbiert Stickoxid während der Katalysator kalt ist und lässt die Stickoxide während der Aufheizphase des Katalysators thermisch frei, wenn der SCR-Katalysator die für eine Stickoxidumsetzung erforderliche Temperatur erreicht hat. Ein weiterer Vorteil der vorliegenden Vorrichtung liegt in der oxidativen Funktion des passiven Stickoxidspeicherkatalysators, wodurch Kohlenwasserstoffe und Kohlenmonoxid reduziert werden und Stickstoffdioxid (NO2) gebildet wird. Demgemäß ist kein zusätzlicher Katalysator zur Oxidation erforderlich. Darüber hinaus bewirkt der in Strömungsrichtung hinter dem passiven Stickoxidspeicherkatalysator angeordnete Partikelfilter mit SCR-Beschichtung (sDPF) eine weitere Verbesserung der Stickoxidumsetzung. Dies wird beispielsweise dadurch realisiert, dass die SCR-Aktivität nahe am Motor stattfindet, wo die Abgastemperatur möglichst hoch ist. Durch die unmittelbare Anordnung des Partikelfilters mit SCR-Beschichtung unmittelbar stromabwärts des passiven Stickoxidspeicherkatalysators wird insgesamt das SCR-Volumen erhöht. The passive nitrogen oxide storage catalyst does not react the nitrogen oxide but adsorbs nitrogen oxide while the catalyst is cold and thermally releases the nitrogen oxides during the catalyst heating phase when the SCR catalyst has reached the temperature required for nitrogen oxide conversion. Another advantage of the present device is the oxidative function of the passive nitrogen oxide storage catalyst, which reduces hydrocarbons and carbon monoxide and forms nitrogen dioxide (NO 2 ). Accordingly, no additional catalyst for oxidation is required. In addition, the particle filter with SCR coating (sDPF) arranged behind the passive nitrogen oxide storage catalytic converter in the flow direction brings about a further improvement in the nitrogen oxide conversion. This is realized, for example, by the fact that the SCR activity takes place close to the engine, where the exhaust gas temperature is as high as possible. The immediate placement of the particulate filter with SCR coating immediately downstream of the passive nitrogen oxide storage catalyst increases the overall SCR volume.
Optional umfasst die Vorrichtung zur Abgasnachbehandlung einen Injektor zum Injizieren von Harnstoff oder Ammoniak und eine Mischeinrichtung, wobei der Injektor und die Mischeinrichtung zwischen dem passiven Stickoxidspeicherkatalysator und dem Partikelfilter angeordnet sind. Auf diese Weise wird die Reduktion von Stickoxid an der SCR-Beschichtung gefördert. Optionally, the exhaust gas aftertreatment device comprises an injector for injecting urea or ammonia and a mixing device, wherein the injector and the mixing device are arranged between the passive nitrogen oxide storage catalytic converter and the particle filter. This way will promoted the reduction of nitric oxide on the SCR coating.
Weiterhin kann die Vorrichtung mindestens einen Temperatursensor und/oder mindestens einen Drucksensor und/oder mindestens einen Stickoxidsensor (NOx-Sensor) umfassen. Die genannten Sensoren ermöglichen eine Erfassung der Betriebsbedingungen der Abgasnachbehandlungsvorrichtung. Furthermore, the device may comprise at least one temperature sensor and / or at least one pressure sensor and / or at least one nitrogen oxide sensor (NOx sensor). The aforementioned sensors allow detection of the operating conditions of the exhaust aftertreatment device.
In einer weiteren Ausgestaltung kann die Vorrichtung einen SCR-Katalysator (SCR) umfassen. Vorzugsweise ist der passive SCR-Katalysator stromabwärts des Partikelfilters mit SCR-Beschichtung angeordnet. Auf diese Weise wird die Reduzierung von Stickoxiden weiter gefördert.In a further embodiment, the device may comprise an SCR catalytic converter (SCR). Preferably, the passive SCR catalyst is located downstream of the SCR-coated particulate filter. In this way, the reduction of nitrogen oxides is further promoted.
In einer alternativen Ausgestaltung kann die Abgasnachbehandlungsvorrichtung einen Oxidationskatalysator, beispielsweise einen Dieseloxidationskatalysator (DOC – Diesel Oxidation Catalyst) umfassen. Vorzugsweise ist der Oxidationskatalysator stromabwärts des Partikelfilters mit SCR-Beschichtung angeordnet.In an alternative embodiment, the exhaust aftertreatment device may include an oxidation catalyst, such as a Diesel Oxidation Catalyst (DOC). Preferably, the oxidation catalyst is located downstream of the particulate filter with SCR coating.
Die beschriebene Vorrichtung zur Abgasnachbehandlung hat insgesamt den Vorteil, dass der Stickoxidspeicherkatalysator zur Kohlenwasserstoff/Kohlenmonoxid-Konversion, zur Stickstoffdioxid-Erzeugung und zur Stickoxidspeicherung und Stickoxidfreigabe verwendet wird ohne dass eine Stickoxidreduktion erfolgt. Die Stickoxidfreigabe findet unter mageren Betriebsbedingungen während der Aufheizphase des Abgases statt. Dies hat den Vorteil, dass keine zusätzliche Steuerung, Regeneration, insbesondere keine aktive Regeneration, oder fette Betriebsbedingungen erforderlich sind. Dadurch dass der Partikelfilter mit einer SCR-Beschichtung ausgestattet ist wird eine SCR-Funktion nahe des Motors ermöglicht, was ein verbessertes Aufheizen und ein zeitiges Erreichen der Stickoxdumetzungsbedingungen (Lit-off bzw. light-off) ermöglicht. Darüber hinaus ist kein Dieseloxidationskatalysator erforderlich. The exhaust gas aftertreatment device described has the overall advantage that the nitrogen oxide storage catalyst is used for hydrocarbon / carbon monoxide conversion, for nitrogen dioxide production and for nitrogen oxide storage and for the release of nitrogen oxides without a nitrogen oxide reduction taking place. The release of nitrogen oxide takes place under lean operating conditions during the heating phase of the exhaust gas. This has the advantage that no additional control, regeneration, in particular no active regeneration, or rich operating conditions are required. The fact that the particulate filter is equipped with an SCR coating, an SCR function is made possible near the engine, which allows improved heating and early achievement of nitrogen-off or light-off conditions. In addition, no diesel oxidation catalyst is required.
Der erfindungsgemäße Katalysator umfasst eine zuvor beschriebene Vorrichtung zur Abgasnachbehandlung. Er hat grundsätzlich dieselben Vorteile wie die zuvor beschriebene Abgasnachbehandlungsvorrichtung. The catalyst according to the invention comprises a previously described device for exhaust aftertreatment. It basically has the same advantages as the exhaust aftertreatment device described above.
Das erfindungsgemäße Kraftfahrzeug umfasst einen zuvor beschriebenen Katalysator oder eine zuvor beschriebene Vorrichtung zur Abgasnachbehandlung. Es hat ebenfalls die bereits beschriebenen Vorteile. The motor vehicle according to the invention comprises a previously described catalytic converter or a device for exhaust gas aftertreatment described above. It also has the advantages already described.
Weitere Merkmale, Eigenschaften und Vorteile der vorliegenden Erfindung werden im Folgenden anhand von Ausführungsbeispielen unter Bezugnahme auf die beigefügten Figuren näher beschrieben. Alle bisher und im Folgenden beschriebenen Merkmale sind dabei sowohl einzeln als auch in einer beliebigen Kombination miteinander vorteilhaft. Die im Folgenden beschriebenen Ausführungsbeispiele stellen lediglich Beispiele dar, welche den Gegenstand der Erfindung jedoch nicht beschränken. Further features, properties and advantages of the present invention will be described in more detail below with reference to exemplary embodiments with reference to the accompanying figures. All features described above and below are advantageous both individually and in any combination with each other. The exemplary embodiments described below are merely examples which, however, do not limit the subject matter of the invention.
Die Figuren zeigen:The figures show:
Die erfindungsgemäße Vorrichtung wird im Folgenden anhand der
In Strömungsrichtung zwischen dem passiven Stickoxidspeicherkatalysator
Optional umfasst die in der
Weiterhin kann die Vorrichtung einen Stickoxidsensor
Die
Bei der in der
Die
Die
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- US 7814747 B2 [0004] US 7814747 B2 [0004]
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE202014103378.5U DE202014103378U1 (en) | 2014-07-21 | 2014-07-23 | Device for exhaust aftertreatment |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
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DE102014214122.2 | 2014-07-21 | ||
DE102014214122.2A DE102014214122A1 (en) | 2014-07-21 | 2014-07-21 | Apparatus and method for exhaust aftertreatment |
DE102014214120 | 2014-07-21 | ||
DE102014214120.6 | 2014-07-21 | ||
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014223490A1 (en) * | 2014-11-18 | 2016-05-19 | Bayerische Motoren Werke Aktiengesellschaft | Exhaust treatment device and method for exhaust treatment |
WO2018057170A1 (en) * | 2016-09-20 | 2018-03-29 | Caterpillar Inc. | After-treatment system |
DE102017201399A1 (en) | 2017-01-30 | 2018-08-02 | Ford Global Technologies, Llc | aftertreatment system |
US10301990B2 (en) | 2017-01-05 | 2019-05-28 | Ford Global Technologies, Llc | Methods and systems for an exhaust gas aftertreatment system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7814747B2 (en) | 2003-01-02 | 2010-10-19 | Daimler Ag | Exhaust gas aftertreatment installation and method |
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Patent Citations (1)
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US7814747B2 (en) | 2003-01-02 | 2010-10-19 | Daimler Ag | Exhaust gas aftertreatment installation and method |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014223490A1 (en) * | 2014-11-18 | 2016-05-19 | Bayerische Motoren Werke Aktiengesellschaft | Exhaust treatment device and method for exhaust treatment |
WO2018057170A1 (en) * | 2016-09-20 | 2018-03-29 | Caterpillar Inc. | After-treatment system |
US10301990B2 (en) | 2017-01-05 | 2019-05-28 | Ford Global Technologies, Llc | Methods and systems for an exhaust gas aftertreatment system |
DE102017201399A1 (en) | 2017-01-30 | 2018-08-02 | Ford Global Technologies, Llc | aftertreatment system |
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