DE10005909A1 - Apparatus for regenerating, heating and desulfurizing a nitrogen oxides storage catalyst of an internal combustion engine comprises using a regeneration agent which is passed through the tank ventilating system and into exhaust gas stream - Google Patents

Apparatus for regenerating, heating and desulfurizing a nitrogen oxides storage catalyst of an internal combustion engine comprises using a regeneration agent which is passed through the tank ventilating system and into exhaust gas stream

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Publication number
DE10005909A1
DE10005909A1 DE10005909A DE10005909A DE10005909A1 DE 10005909 A1 DE10005909 A1 DE 10005909A1 DE 10005909 A DE10005909 A DE 10005909A DE 10005909 A DE10005909 A DE 10005909A DE 10005909 A1 DE10005909 A1 DE 10005909A1
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Germany
Prior art keywords
exhaust gas
gas stream
internal combustion
combustion engine
regeneration
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Application number
DE10005909A
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German (de)
Inventor
Olaf Lietz
Alfred Ottowitz
Bernhard Pfalzgraf
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Audi AG
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Audi AG
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Application filed by Audi AG filed Critical Audi AG
Priority to DE10005909A priority Critical patent/DE10005909A1/en
Publication of DE10005909A1 publication Critical patent/DE10005909A1/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
    • F01N3/08—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
    • 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
    • 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
    • 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
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • 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
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • F01N3/0885—Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps
    • 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
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2033—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using a fuel burner or introducing fuel into exhaust duct
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F02M25/089—Layout of the fuel vapour installation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/035—Fuel tanks characterised by venting 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • 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
    • 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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/36—Arrangements for supply of additional fuel
    • 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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/38—Arrangements for igniting
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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

Apparatus for regenerating, heating and desulfurizing a nitrogen oxides storage catalyst (13) of an internal combustion engine (1) comprises using a regeneration agent which is passed through the tank ventilating system (6) and into the exhaust gas stream. Preferred Features: The regeneration agent is introduced upstream at a site or directly introduced in the catalyst into the exhaust gas stream. The agent is introduced via a valve. Regeneration of the catalyst is carried out during the operation of the engine. A pump (15) for producing a defined pressure drop is arranged between the tank ventilating system and the site at which the agent is fed into the exhaust gas stream.

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zum Regenerieren, Hei­ zen und Entschwefeln des NOx-Speicherkatalysators einer Brennkraftma­ schine.The present invention relates to a device for regenerating, heating and desulfurizing the NO x storage catalyst of an internal combustion engine.

Zur Reduzierung des Kraftstoffverbrauchs wird angestrebt, fremd gezündete Ottomotoren über einen möglichst großen Betriebsreich bei Lambda < 1 zu betreiben. Um die auf Grund des Luftüberschusses entstehenden erhöhten NOx-Emissionen zu reduzieren, werden dabei NOx-Speicherkatalysatoren eingesetzt, die große Teile des entstehenden NOx speichern. Nach der Be­ ladung mit NOx muss der NOx-Speicherkatalysator während des Betriebs bei Lambda < 1 regeneriert und nach größeren Intervallen auch entschwefelt werden.In order to reduce fuel consumption, the aim is to operate externally ignited gasoline engines over the largest possible operating range at lambda <1. To reduce the resulting due to the excess air increased NO x emissions, while NOx storage catalytic converters are used to store large parts of the resulting NOx. After loading with NO x , the NO x storage catalytic converter must be regenerated during operation at lambda <1 and desulphurized after longer intervals.

Aus der Druckschrift DE 196 53 756 C2 ist es zur Regeneration des NOx- Speicherkatalysators bekannt, einen Verbrennungstakt der Brennkraftma­ schine mit Kraftstoffüberschuss erfolgen zu lassen, während eines Verbren­ nungstaktes der Brennkraftmaschine keinen Zündfunken zu erzeugen oder während eines Auslaßtaktes der Brennkraftmaschine eine zusätzliche Kraft­ stoffzumessung erfolgen zu lassen.From DE 196 53 756 C2 it is known for regeneration of the NO x storage catalytic converter to have a combustion cycle of the internal combustion engine with excess fuel, to generate no ignition sparks during a combustion cycle of the internal combustion engine or to generate an additional fuel metering during an exhaust cycle of the internal combustion engine to be done.

Darüber hinaus ist es aus der Druckschrift EP 0 872 633 A2 bekannt, zur Regeneration des NOx-Speicherkatalysators das Abgas rückzuführen, die Ansaugluft zu drosseln oder die Temperatur des NOx-Speicherkatalysators zu steuern.In addition, it is known from the document EP 0 872 633 A2 to recycle the exhaust gas for the regeneration of the NO x storage catalytic converter, to throttle the intake air or to control the temperature of the NO x storage catalytic converter.

Die bisher bekannten Maßnahmen haben jedoch den Nachteil, dass zum Regenerieren und Entschwefeln der homogene Betrieb bedingt wird. So­ lange der Motor aber im schichtladefähigen Betriebsbereich betrieben wird, führt die Umschaltung in den homogenen Betrieb zu Wirkungsgradverlusten. Darüber hinaus wird auch der Komfort negativ beeinflusst.The previously known measures have the disadvantage, however, that Regenerate and desulfurize the homogeneous operation is required. Like this as long as the engine is operated in the stratified area,  the switchover to homogeneous operation leads to efficiency losses. Comfort is also negatively affected.

Vor diesem Hintergrund ist es Aufgabe der vorliegenden Erfindung, eine ver­ besserte Vorrichtung zum Regenerieren, Heizen und Entschwefeln des NOx- Speicherkatalysators einer Brennkraftmaschine bereitzustellen, welche die Umschaltvorgänge reduziert und den Fahrkomfort steigert.Against this background, it is an object of the present invention to provide an improved device for regenerating, heating and desulfurizing the NO x storage catalytic converter of an internal combustion engine, which reduces the switching processes and increases driving comfort.

Gelöst wird die Aufgabe durch eine Vorrichtung mit den Merkmalen des Pa­ tentanspruchs 1. Indem das zur Regeneration benötigte Regenerationsmittel durch das Tankentlüftungssystem bereitgestellt und in den Abgasstrom ein­ geleitet wird, werden die zur Regeneration erforderlichen HC-Moleküle auf einfache Weise bereitgestellt und wird gleichzeitig eine Spülung des Tank­ entlüftungssystems durchgeführt. Dadurch entsteht ein partiell unterstöchio­ metrisches Gemisch, welches die Regeneration oder die Entschwefelung des Katalysators ermöglicht. Die HC-Moleküle erzeugen in Verbindung mit dem Luftüberschuss eine exotherme Reaktion im NOx-Speicherkatalysator. Dabei ergibt sich das Verhältnis zwischen erzeugter Exotherme und partieller Überfettung aus der Abgastemperatur und dem Verhältnis von Luftmassen­ strom im Abgassystem und der Spülrate durch das Tankentlüftungssystem. Mit dieser Vorrichtung wird eine Regeneration des NOx-Speicherkatalysators ohne eine Umschaltung vom geschichteten Betrieb auf den homogenen Be­ trieb der Brennkraftmaschine erreicht.The object is achieved by a device having the features of claim 1. By providing the regeneration agent required for regeneration through the tank ventilation system and passing it into the exhaust gas stream, the HC molecules required for regeneration are provided in a simple manner and at the same time become a purge of the tank ventilation system. This creates a partially substoichiometric mixture that enables regeneration or desulfurization of the catalyst. In conjunction with the excess air, the HC molecules produce an exothermic reaction in the NO x storage catalytic converter. The ratio between the exotherm and partial overfat generation results from the exhaust gas temperature and the ratio of air mass flow in the exhaust system and the purge rate through the tank ventilation system. With this device, regeneration of the NO x storage catalyst is achieved without switching from stratified operation to homogeneous operation of the internal combustion engine.

Zweckmäßig erfolgt die Einleitung des Regenerationsmittels über ein Ventil. Dieses Ventil, welches neben dem ersten Tankentlüftungsventil des Tank­ entlüftungssystems ein zweites Tankentlüftungsventil darstellt, gewährleistet, dass die Verbindung zwischen dem Tankentlüftungssystem und dem NOx- Speicherkatalysator nur in der gewünschten Richtung vom Tankentlüftungs­ system zum NOx-Speicherkatalysator durchgängig ist.The regeneration agent is expediently introduced via a valve. This valve, which in addition to the first tank ventilation valve of the tank ventilation system represents a second tank ventilation valve, ensures that the connection between the tank ventilation system and the NO x storage catalytic converter is only continuous in the desired direction from the tank ventilation system to the NO x storage catalytic converter.

Die Regeneration des NOx-Speicherkatalysators kann somit während des geschichteten Betriebs der Brennkraftmaschine ohne weiteres erfolgen, wenn in dieser Phase zwischen dem Tankentlüftungssystem und der Stelle, an der das Regenerationsmittel in den Abgasstrom eingeleitet wird, eine Ein­ richtung zur Erzeugung eines definierten Druckgefälles vorgesehen ist. Da­ durch kann selbst bei hoher Zylinderfüllung eine genau definierte Menge an Regenerationsmittel für den NOx-Speicherkatalysator eingebracht werden. Ein gezieltes Heizen des NOx-Speicherkatalysators ist ebenfalls möglich.The regeneration of the NO x storage catalytic converter can thus easily take place during the stratified operation of the internal combustion engine if, in this phase, a device is provided for generating a defined pressure gradient between the tank ventilation system and the point at which the regeneration agent is introduced into the exhaust gas stream . As a result, a precisely defined amount of regeneration agent for the NO x storage catalytic converter can be introduced even with a high cylinder charge. A targeted heating of the NO x storage catalytic converter is also possible.

Durch das Einstellens eines definierten Druckgefälles zwischen Tankentlüf­ tungssystem und Saugrohr wird außerdem ein Spülen des Aktivkohlefilters im homogenen Betrieb bei hohen Zylinderfüllungen durch das standardmä­ ßig verbundene erste Tankentlüftungsventil ermöglichtBy setting a defined pressure gradient between the tank vent The system and intake manifold will also be rinsing the activated carbon filter in homogeneous operation with high cylinder fillings by the standard Connected first tank vent valve allows

Gemäß einer besonderen Weiterbildung der Erfindung ist die Einrichtung zur Erzeugung eines Druckgefälles eine zusätzliche Pumpe, eine Sekundärluft­ pumpe oder eine Leckdiagnosepumpe. Dabei sind die Sekundärluftpumpe oder die Leckdiagnosepumpe an der Brennkraftmaschine meist standard­ mäßig vorhanden und können auch ohne weiteres eine Doppelfunktion übernehmen, so dass hierdurch erhebliche Kosten eingespart werden.According to a special development of the invention, the device for Generating a pressure drop an additional pump, a secondary air pump or a leak diagnosis pump. Here are the secondary air pump or the leak diagnosis pump on the internal combustion engine is usually standard moderately available and can also easily perform a double function take over, so that this saves considerable costs.

Zur Entkopplung von möglichen Druckschwankungen sollte die Einrichtung zur Erzeugung des Druckgefälles zwischen dem Tankentlüftungssystem und der Stelle, an der das Regenerationsmittel in den Abgasstrom eingeleitet wird bzw. zwischen dem Tankentlüftungssystem und der Stelle stromauf des Saugrohrs einen Druckspeicher aufweisen.The device should be used to decouple possible pressure fluctuations to generate the pressure gradient between the tank ventilation system and the point at which the regeneration agent is introduced into the exhaust gas stream is or between the tank ventilation system and the point upstream of the Intake pipe have a pressure accumulator.

Bevorzugt ist an der Stelle, an der das Regenerationsmittel in den Abgas­ strom eingeleitet wird, eine Einrichtung zum Auslösen einer exothermen Re­ aktion vorgesehen. Diese Einrichtung zum Auslösen einer exothermen Re­ aktion, die in der Regel ein Glühstift oder eine Zündkerze ist, sollte während der Aufheizung des NOx-Speicherkatalysators angesteuert werden, um die exotherme Reaktion zu begünstigen.A device for triggering an exothermic reaction is preferably provided at the point at which the regeneration agent is introduced into the exhaust gas stream. This device for triggering an exothermic reaction, which is usually a glow plug or a spark plug, should be activated during the heating of the NO x storage catalytic converter in order to promote the exothermic reaction.

Die vorliegende Erfindung wird unter Bezugnahme auf die nachfolgenden Zeichnungsfiguren näher erläutert. Es zeigen:The present invention will be described with reference to the following Drawing figures explained in more detail. Show it:

Fig. 1 eine erste Ausführungsform der Vorrichtung mit einer zu­ sätzlichen Pumpe als Einrichtung zur Erzeugung des Druck­ gefälles; Figure 1 shows a first embodiment of the device with an additional pump as a device for generating the pressure gradient.

Fig. 2 eine zweite Ausführungsform der Vorrichtung mit einer Se­ kundärluftpumpe als Einrichtung zur Erzeugung des Druck­ gefälles; und Figure 2 shows a second embodiment of the device with a Se Kundärluftpumpe as a device for generating the pressure gradient. and

Fig. 3 eine dritte Ausführungsform der Vorrichtung mit einer Leck­ diagnosepumpe als Einrichtung zur Erzeugung des Druck­ gefälles. Fig. 3 shows a third embodiment of the device with a leak diagnostic pump as a device for generating the pressure gradient.

In Fig. 1 ist eine direkteinspritzende Brennkraftmaschine 1 mit wenigstens einem Einlassventil 2 und einem Auslassventil 3 pro Zylinder 4 in stark ver­ einfachter Form dargestellt.In Fig. 1, a direct injection internal combustion engine 1 with at least one inlet valve 2 and one outlet valve 3 per cylinder 4 is shown in a very simple form.

Das dem Einlassventil 2 vorgeschaltete Ansaugsystem 5 steht mit einem Tankentlüftungssystem 6, welches einen Tank 7, einen Aktivkohlefilter 8 und ein erstes Tankentlüftungsventil 9 umfasst, in Verbindung. Dabei mündet das erste Tankentlüftungsventil 9 stromauf des Saugrohrs 10 der Brennkraftma­ schine 1 in das Ansaugsystem.The intake system 5 upstream of the inlet valve 2 is connected to a tank ventilation system 6 , which comprises a tank 7 , an activated carbon filter 8 and a first tank ventilation valve 9 . The first tank ventilation valve 9 opens upstream of the intake manifold 10 of the internal combustion engine 1 into the intake system.

Das dem Auslassventil 3 nachgeschaltete Abgassystem 11 weist im darge­ stellten Beispiel einen Vorkatalysator 12 und einen NOx-Speicherkatalysator 13 auf.The exhaust valve 3 downstream of the exhaust system 11 has the Darge presented example, a pre-catalyst 12 and a NO x storage catalytic converter. 13

Zur Regeneration des NOx-Speicherkatalysators 13 ist zwischen dem Tank­ entlüftungssystem 6 und dem NOx-Speicherkatalysator 13 eine Verbin­ dungsleitung 14 vorgesehen, so dass das für die Regeneration benötigte Regenerationsmittel von dem Tankentlüftungssystem 6 bereitgestellt werden kann. Dazu ist im Bereich der Verbindungsleitung 14 eine Einrichtung zur Er­ zeugung eines Druckgefälles, nämlich eine zusätzliche Pumpe 15 vorgese­ hen und ist an einer Stelle stromauf des NOx-Speicherkatalysators 13, an der das Regenerationsmittel in dem Abgasstrom eingeleitet wird, ein Ventil, welches als zweites Tankentlüftungsventil 16 arbeitet, vorgesehen. Zwischen der zusätzlichen Pumpe 15 und dem zweiten Tankentlüftungsventil 16 ist außerdem ein Druckspeicher 17 vorgesehen, der zur Entkopplung von Druckschwankungen an der Einleitstelle dient.Can be used for regeneration of the NO x storing catalyst 13 is between the tank vent system 6 and the NO x storing catalyst 13 is a Verbin-making circuit 14 is provided, so that the required regeneration means for regenerating from the tank vent system 6 is provided. For this purpose, in the area of the connecting line 14 there is a device for generating a pressure drop, namely an additional pump 15, and is located at a point upstream of the NO x storage catalytic converter 13 , at which the regeneration agent is introduced into the exhaust gas stream, a valve which, second tank ventilation valve 16 operates, provided. Between the auxiliary pump 15 and the second tank vent valve 16 also a pressure accumulator 17 is provided, which provides decoupling of pressure fluctuations at the inlet.

Durch die zusätzliche Pumpe 15 kann der Aktivkohlefilter 8 des Tankent­ lüftungssystems 6 somit in Richtung zu dem ersten Tankentlüftungsventil 9 oder zu dem zweiten Tankentlüftungsventil 16 gespült werden, wobei sich der erste Fall im homogenen Betrieb und der zweite Fall im geschichteten Betrieb der Brennkraftmaschine 1 anbietet. Natürlich ist aber auch eine Kombination der beiden Fälle denkbar. With the additional pump 15 , the activated carbon filter 8 of the tank ventilation system 6 can thus be flushed in the direction of the first tank ventilation valve 9 or the second tank ventilation valve 16 , the first case being offered in homogeneous operation and the second case in stratified operation of internal combustion engine 1 . Of course, a combination of the two cases is also conceivable.

In Fig. 2 ist anstelle der zusätzlichen Pumpe eine Sekundärluftpumpe 15' als Einrichtung zur Erzeugung des Druckgefälles vorgesehen. Daher steht die Einrichtung zur Erzeugung des Druckgefälles bei dieser Ausführungsform über weitere Ventile 18, 19 auch mit der Außenluft und mit dem Abgas­ system 11 in Verbindung, um im Bedarfsfall dem Abgasstrom Sekundärluft zuführen zu können.In Fig. 2, a secondary air pump 15 'is provided as a device for generating the pressure gradient instead of the additional pump. Therefore, the device for generating the pressure gradient in this embodiment is connected to the outside air and to the exhaust system 11 via further valves 18 , 19 in order to be able to supply the exhaust gas stream with secondary air if necessary.

Und in Fig. 3. ist schließlich eine Leckdiagnosepumpe 15" als Einrichtung zur Erzeugung des Druckgefälles vorgesehen. Daher steht die Einrichtung zur Erzeugung des Druckgefälles bei dieser dritten Ausführungsform mit dem Tank 7 des Tankentlüftungssystems 6 in Verbindung, um im Bedarfsfalle ei­ ne Leckdiagnose durchführen zu können.And finally, in Fig. 3, a leak diagnosis pump 15 "is provided as a device for generating the pressure gradient. Therefore, the device for generating the pressure gradient in this third embodiment is connected to the tank 7 of the tank ventilation system 6 in order to carry out a leak diagnosis if necessary can.

Das weitere Ventil 20 ist bei den Ausführungsformen der Fig. 2 und 3 nötig, um das Tankentlüftungssystem 6 bzw. den Tank 7 und den Aktivkoh­ lefilter 8 bei der Erzeugung des Druckgefälles abzuschirmen.The further valve 20 is necessary in the embodiments of FIGS. 2 and 3 in order to shield the tank ventilation system 6 or the tank 7 and the activated carbon filter 8 when the pressure gradient is generated.

Claims (9)

1. Vorrichtung zum Regenerieren, Heizen und Entschwefeln des NOx- Speicherkatalysators (13) einer Brennkraftmaschine (1), wobei das zur Regeneration benötigte Regenerationsmittel durch das Tankentlüf­ tungssystem (6) bereitgestellt und in den Abgasstrom eingeleitet wird.1. Device for regenerating, heating and desulfurizing the NO x storage catalyst ( 13 ) of an internal combustion engine ( 1 ), the regeneration agent required for the regeneration being provided by the tank ventilation system ( 6 ) and introduced into the exhaust gas stream. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Re­ generationsmittel an einer Stelle stromauf oder direkt im NOx- Speicherkatalysator (13) in den Abgasstrom eingeleitet wird.2. Device according to claim 1, characterized in that the generation means Re is introduced into the exhaust gas stream at one point upstream or directly in the NO x storage catalytic converter ( 13 ). 3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Einleitung des Regenerationsmittels über ein Ventil erfolgt.3. Device according to claim 1 or 2, characterized in that the The regeneration agent is introduced via a valve. 4. Vorrichtung nach Anspruch 1 bis 3, dadurch gekennzeichnet, dass die Regeneration des NOx-Speicherkatalysators (13) während des ge­ schichteten Betriebs der Brennkraftmaschine (1) erfolgt, indem zwi­ schen dem Tankentlüftungssystem (6) und der Stelle, an der das Re­ generationsmittel in den Abgasstrom eingeleitet wird, eine Einrichtung zur Erzeugung eines definierten Druckgefälles vorgesehen ist.4. The device according to claim 1 to 3, characterized in that the regeneration of the NO x storage catalyst ( 13 ) takes place during the stratified operation of the internal combustion engine ( 1 ) by inter mediate the tank ventilation system ( 6 ) and the point at which Re generation means is introduced into the exhaust gas stream, a device for generating a defined pressure gradient is provided. 5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeich­ net, dass die Regeneration des NOx-Speicherkatalysators (13) wäh­ rend des homogenen Betriebs der Brennkraftmaschine (1) erfolgt, in­ dem zwischen dem Tankentlüftungssystem (6) und einer Steile strom­ auf des Saugrohrs (10) der Brennkraftmaschine (1) eine Einrichtung zur Erzeugung eines definierten Druckgefälles vorgesehen ist. 5. Device according to one of claims 1 to 4, characterized in that the regeneration of the NO x storage catalyst ( 13 ) takes place during the homogeneous operation of the internal combustion engine ( 1 ) in which between the tank ventilation system ( 6 ) and a steep current A device for generating a defined pressure gradient is provided on the intake manifold ( 10 ) of the internal combustion engine ( 1 ). 6. Vorrichtung nach einem der Ansprüche 4 bis 5, dadurch gekennzeich­ net, dass die Einrichtung zur Erzeugung des Druckgefälles eine zusätz­ liche Pumpe (15), eine Sekundärluftpumpe (15') oder eine Leckdiagno­ sepumpe (15") ist.6. Device according to one of claims 4 to 5, characterized in that the device for generating the pressure gradient is an additional pump ( 15 ), a secondary air pump ( 15 ') or a leak diagnosis pump ( 15 "). 7. Vorrichtung nach einem der Ansprüche 4 bis 6, dadurch gekennzeich­ net, dass die Einrichtung zur Erzeugung des Druckgefälles einen zwi­ schen dem Tankentlüftungssystem (6) und der Stelle, an der das Re­ generationsmittel in den Abgasstrom eingeleitet wird, bzw. einen zwi­ schen dem Tankentlüftungssystem (6) und der Stelle stromauf des Saugrohrs (10) angeordneten Druckspeicher (17) aufweist.7. Device according to one of claims 4 to 6, characterized in that the means for generating the pressure gradient between the tank's ventilation system ( 6 ) and the point at which the generative agent is introduced into the exhaust gas stream, or between the tank ventilation system ( 6 ) and the location upstream of the intake manifold ( 10 ) arranged pressure accumulator ( 17 ). 8. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeich­ net, dass an der Stelle, an der das Regenerationsmittel in den Abgas­ strom eingeleitet wird, eine Einrichtung zum Auslösen einer exothermen Reaktion vorgesehen ist.8. Device according to one of claims 1 to 7, characterized in net that at the point where the regenerant in the exhaust current is initiated, a device for triggering an exothermic Reaction is provided. 9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass die Ein­ richtung zum Auslösen einer exothermen Reaktion ein Glühstift oder eine Zündkerze ist.9. The device according to claim 8, characterized in that the one direction to trigger an exothermic reaction is a spark plug.
DE10005909A 2000-02-10 2000-02-10 Apparatus for regenerating, heating and desulfurizing a nitrogen oxides storage catalyst of an internal combustion engine comprises using a regeneration agent which is passed through the tank ventilating system and into exhaust gas stream Withdrawn DE10005909A1 (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004111403A1 (en) * 2003-06-18 2004-12-23 Daimlerchrysler Ag Internal combustion engine with secondary air injection
DE102016205840A1 (en) * 2016-04-07 2017-10-12 Volkswagen Aktiengesellschaft A method of purging a fuel vapor sorbent and vehicle
WO2018069254A1 (en) * 2016-10-10 2018-04-19 Volkswagen Ag Method for regenerating a particle filter, and motor vehicle having a particle filter
DE102017223277A1 (en) * 2017-12-19 2019-06-19 Continental Automotive Gmbh Device for operating a tank ventilation system of an internal combustion engine
WO2019121166A1 (en) * 2017-12-19 2019-06-27 Continental Automotive Gmbh Method and device for regenerating a particulate filter arranged in an exhaust gas tract of an internal combustion engine
CN111742120A (en) * 2018-02-27 2020-10-02 爱三工业株式会社 Exhaust gas purification system
DE102019122900A1 (en) * 2019-08-27 2021-03-04 Volkswagen Aktiengesellschaft Machine with a pump system and a method for operating a pump system in the machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19744738A1 (en) * 1996-10-16 1998-04-30 Ford Global Tech Inc Method and device for monitoring the effectiveness of a NOx trap
DE19744579A1 (en) * 1996-10-16 1998-04-30 Ford Global Tech Inc Method and device for monitoring the effectiveness of a NO¶x¶ trap
DE19707849A1 (en) * 1997-02-27 1998-09-03 Opel Adam Ag Device for the aftertreatment of exhaust gases from a spark ignition internal combustion engine
DE19851319A1 (en) * 1998-11-06 2000-05-11 Siemens Ag Method for determining the raw NOx emission of an internal combustion engine that can be operated with excess air

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19744738A1 (en) * 1996-10-16 1998-04-30 Ford Global Tech Inc Method and device for monitoring the effectiveness of a NOx trap
DE19744579A1 (en) * 1996-10-16 1998-04-30 Ford Global Tech Inc Method and device for monitoring the effectiveness of a NO¶x¶ trap
DE19707849A1 (en) * 1997-02-27 1998-09-03 Opel Adam Ag Device for the aftertreatment of exhaust gases from a spark ignition internal combustion engine
DE19851319A1 (en) * 1998-11-06 2000-05-11 Siemens Ag Method for determining the raw NOx emission of an internal combustion engine that can be operated with excess air

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004111403A1 (en) * 2003-06-18 2004-12-23 Daimlerchrysler Ag Internal combustion engine with secondary air injection
DE102016205840A1 (en) * 2016-04-07 2017-10-12 Volkswagen Aktiengesellschaft A method of purging a fuel vapor sorbent and vehicle
WO2018069254A1 (en) * 2016-10-10 2018-04-19 Volkswagen Ag Method for regenerating a particle filter, and motor vehicle having a particle filter
CN109804145A (en) * 2016-10-10 2019-05-24 大众汽车有限公司 For regenerating the method for particulate filter and with the automobile of particulate filter
US10934908B2 (en) 2016-10-10 2021-03-02 Volkswagen Aktiengesellschaft Method for regenerating a particle filter, and motor vehicle having a particle filter
WO2019121169A1 (en) * 2017-12-19 2019-06-27 Continental Automotive Gmbh Device for operating a tank ventilation system of an internal combustion engine
WO2019121166A1 (en) * 2017-12-19 2019-06-27 Continental Automotive Gmbh Method and device for regenerating a particulate filter arranged in an exhaust gas tract of an internal combustion engine
KR20200096647A (en) * 2017-12-19 2020-08-12 비테스코 테크놀로지스 게엠베하 Device for operating tank ventilation system of internal combustion engine
CN111601961A (en) * 2017-12-19 2020-08-28 维特思科科技有限责任公司 Device for operating a tank ventilation system of an internal combustion engine
DE102017223277A1 (en) * 2017-12-19 2019-06-19 Continental Automotive Gmbh Device for operating a tank ventilation system of an internal combustion engine
US10941731B2 (en) 2017-12-19 2021-03-09 Vitesco Technologies GmbH Device for operating a tank ventilation system of an internal combustion engine
KR102336891B1 (en) * 2017-12-19 2021-12-07 비테스코 테크놀로지스 게엠베하 Device for operating the tank ventilation system of an internal combustion engine
DE102017223277B4 (en) 2017-12-19 2024-03-07 Vitesco Technologies GmbH Device for operating a tank ventilation system of an internal combustion engine
CN111742120A (en) * 2018-02-27 2020-10-02 爱三工业株式会社 Exhaust gas purification system
DE102019122900A1 (en) * 2019-08-27 2021-03-04 Volkswagen Aktiengesellschaft Machine with a pump system and a method for operating a pump system in the machine

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