EP1259718B1 - Device and method for controlling the no x? regeneration of a no x? storage catalyst - Google Patents
Device and method for controlling the no x? regeneration of a no x? storage catalyst Download PDFInfo
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- EP1259718B1 EP1259718B1 EP01909616A EP01909616A EP1259718B1 EP 1259718 B1 EP1259718 B1 EP 1259718B1 EP 01909616 A EP01909616 A EP 01909616A EP 01909616 A EP01909616 A EP 01909616A EP 1259718 B1 EP1259718 B1 EP 1259718B1
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- European Patent Office
- Prior art keywords
- regeneration
- storage catalyst
- idling mode
- threshold value
- combustion engine
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Classifications
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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
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/08—Introducing corrections for particular operating conditions for idling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0806—NOx storage amount, i.e. amount of NOx stored on NOx trap
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/41—Control to generate negative pressure in the intake manifold, e.g. for fuel vapor purging or brake booster
Definitions
- the invention relates to an apparatus and a method for controlling a NO x regeneration of an arranged in the exhaust system of an internal combustion engine for motor vehicles NO x storage catalytic converter with the features mentioned in the preambles of the independent claims.
- the catalyst is associated with a NO x storage, which absorbs the NO x as nitrate.
- the NO x storage can be combined with the catalyst as a so-called NO x storage catalytic converter.
- a storage capacity of the NO x storage catalytic converter is of course limited in quantity, so that in order to avoid NO x breakthroughs at regular intervals a NO x regeneration must take place. This is described in US Pat. No. 5,992,142 (column 5). During the NO x regeneration, a change to stoichiometric or rich operation takes place. The previously absorbed in the form of nitrate NO x is released again. Usually, the NO x regeneration is started when a threshold value for a load state of the NO x storage catalytic converter or a NO x emission (break-through emission) detected downstream by an NO x -sensitive measuring device is exceeded.
- the disadvantage here is that the determination of a Regeneration need in all operating phases of the motor vehicle is carried out according to the same criteria.
- the re-desorbed NO x can only be reduced incomplete on the catalyst component.
- a regeneration-related excess consumption in the idling phase is higher than in phases of high load requirements for the internal combustion engine.
- Another disadvantage is that the NO x regeneration in idle often accompanied by an undesirable noise.
- NO x regenerations in idle take longer due to the lower exhaust flows, and the consumption-less operation must therefore be maintained longer.
- this object is achieved by the device and the method for controlling the NO x regeneration of the NO x storage catalytic converter with the features mentioned in the independent claims.
- the device according to the invention has means with which the method steps can be carried out.
- Such means is preferably a control unit in which a procedure is stored in digitized form, which allows the control of the NO x regeneration at idle.
- the control unit can be realized as an independent control unit or else integrated into an already frequently existing engine control unit.
- a NO x regeneration is being carried out during a change to idling, this is preferably completed when the change to idling takes place in a fuel cut-off phase, a rotational speed is above a predetermined threshold value or a motor vehicle speed is still a predetermined limit speed exceeds.
- a flag is set which causes the NO x regeneration to be continued in a subsequent acceleration phase. Of course, the flag is withdrawn if an NO x regeneration had to be carried out in idle mode already.
- FIG. 1 shows an internal combustion engine 10 with a subsequently arranged in the exhaust line 12 NO x storage catalytic converter 14.
- the exhaust system 12 is associated with a suitable sensor for detecting the air conditions in the exhaust gas or the shares of specific pollutant components.
- a gas sensor 16 as a lambda probe and a gas sensor can be for example 18 as a NO x -sensitive measuring device are provided.
- the data acquired by the sensors are provided in a known manner in an engine control unit 20.
- models are stored in digitized form, with which manipulated variables for the internal combustion engine 10 associated components are determined.
- the components allow the combustion process to be influenced with regard to an air ratio, an ignition angle or also an injected fuel mass.
- an opening angle of an exhaust gas recirculation valve 22 or a position of a throttle valve 24 come into question as control variables.
- the device and the method for regulating the combustion process are well known and will therefore not be explained in detail here.
- step S1 it is determined in a first query whether the motor vehicle is in an idling phase (step S1). If this is negative, the NO x regeneration of the NO x storage catalyst 14 may be controlled by a conventional method. For this purpose, a loading state of the NO x storage catalytic converter 14 or a NO x emission downstream of the NO x storage catalytic converter 14 is monitored (step S 2). When a threshold is exceeded for this quantity, the NO x regeneration is initiated by a change to stoichiometric or rich operation.
- Steps S5 and S6, or if the change in the idling does not take place during an ongoing NO x regeneration (step S3) is followed by a redefinition of the thresholds for determining the need for regeneration (step S7).
- the thresholds for the load state or the NO x emission used in the conventional methods are increased.
- the values are to be determined so that no significant NO x breakthroughs can occur at idling.
- due to the low exhaust gas mass flows this can also be ensured with higher threshold values than for the other operating phases of the internal combustion engine 10.
Abstract
Description
Die Erfindung betrifft eine Vorrichtung und ein Verfahren zur Steuerung einer NOx-Regeneration eines im Abgasstrang einer Verbrennungskraftmaschine für Kraftfahrzeuge angeordneten NOx-Speicherkatalysators mit den in den Oberbegriffen der unabhängigen Ansprüche genannten Merkmalen.The invention relates to an apparatus and a method for controlling a NO x regeneration of an arranged in the exhaust system of an internal combustion engine for motor vehicles NO x storage catalytic converter with the features mentioned in the preambles of the independent claims.
Es ist bekannt zur Reinigung eines Abgases von Verbrennungskraftmaschinen eine Abgasreinigungsanlage im Abgasstrang zu integrieren. Die Abgasreinigungsanlage umfasst dabei üblicherweise Komponenten wie Partikelfilter oder Katalysatoren. Soll eine NOx-Rohemission der Verbrennungskraftmaschine gemindert werden, so umfassen diese Katalysatoren einen Reduktionskatalysator. Sofern die Massenströme an reduzierend wirkenden Schadstoffen wie Kohlenmonoxid CO und unvollständig verbrannten Kohlenwasserstoffen HC im Bereich des Reduktionskatalysators ausreichend hoch sind, wird mit Hilfe der Reduktionsmittel NOx zu Stickstoff konvertiert.It is known to integrate an exhaust gas purification system in the exhaust system for cleaning an exhaust gas of internal combustion engines. The exhaust gas purification system usually includes components such as particle filters or catalysts. If a NO x raw emissions of the internal combustion engine are to be reduced, then these catalysts comprise a reduction catalyst. If the mass flows of reducing pollutants such as carbon monoxide CO and incompletely burned hydrocarbons HC in the region of the reduction catalyst are sufficiently high, NO x is converted to nitrogen with the aid of the reducing agent.
Unter dem Gesichtspunkt minimierter Kraftstoffverbräuche hat es sich als vorteilhaft erwiesen die Verbrennungskraftmaschine bei mageren Luftverhältnissen zu betreiben. Allerdings ist der Betrieb im verbrauchsoptimierten Bereich einerseits mit erhöhter NOx-Emission und andererseits mit verringerten Reduktionsmittelmassenströmen verbunden. Zur Vermeidung hoher NOx-Emissionen ist daher dem Katalysator ein NOx-Speicher zugeordnet, der das NOx als Nitrat absorbiert. Der NOx-Speicher kann mit dem Katalysator als sogenannter NOx-Speicherkatalysator zusammengefasst werden.From the point of view of minimized fuel consumption, it has proved to be advantageous to operate the internal combustion engine under lean air conditions. However, the operation in the consumption-optimized area is associated on the one hand with increased NO x emissions and on the other hand with reduced reductant mass flows. To avoid high NO x emissions, therefore, the catalyst is associated with a NO x storage, which absorbs the NO x as nitrate. The NO x storage can be combined with the catalyst as a so-called NO x storage catalytic converter.
Eine Speicherkapazität des NOx-Speicherkatalysators ist naturgemäß mengenmäßig beschränkt, so dass zur Vermeidung von NOx-Durchbrüchen in regelmäßigen Abständen eine NOx-Regeneration stattfinden muss. Dies ist in der US-A-5 992 142 (Spalte 5) beschrieben. Während der NOx-Regeneration erfolgt ein Wechsel in den stöchiometrischen oder fetten Betrieb. Das zuvor in Form von Nitrat absorbierte NOx wird wieder freigesetzt. Üblicherweise wird die NOx-Regeneration in Gang gesetzt, wenn ein Schwellenwert für einen Beladungszustand des NOx-Speicherkatalysators oder eine stromab durch eine NOx-sensitive Messeinrichtung erfasste NOx-Emission (Durchbruchsemission) überschritten wird. Nachteilig hierbei ist, dass die Bestimmung einer Regenerationsnotwendigkeit in allen Betriebsphasen des Kraftfahrzeuges nach den gleichen Kriterien erfolgt. Da jedoch in einer Leerlaufphase wesentlich geringere Abgasströme und damit bei eingeleiteter NOx-Regeneration geringere Reduktionsmittelmassenströme vorhanden sind, kann das wieder desorbierte NOx nur noch unvollständig an der Katalysatorkomponente reduziert werden. Neben der unerwünscht hohen NOx-Emission während der NOx-Regeneration ist ein regenerationsbedingter Mehrverbrauch in der Leerlaufphase höher als in Phasen hoher Lastanforderungen an die Verbrennungskraftmaschine. Weiterhin ist nachteilig, dass die NOx-Regeneration im Leerlauf häufig mit einer unerwünschten Lärmentwicklung einhergeht. Zusätzlich dauern NOx-Regenerationen im Leerlauf wegen der geringeren Abgasströme länger, und der verbrauchsungünstige Betrieb muss daher auch länger aufrechterhalten werden.A storage capacity of the NO x storage catalytic converter is of course limited in quantity, so that in order to avoid NO x breakthroughs at regular intervals a NO x regeneration must take place. This is described in US Pat. No. 5,992,142 (column 5). During the NO x regeneration, a change to stoichiometric or rich operation takes place. The previously absorbed in the form of nitrate NO x is released again. Usually, the NO x regeneration is started when a threshold value for a load state of the NO x storage catalytic converter or a NO x emission (break-through emission) detected downstream by an NO x -sensitive measuring device is exceeded. The disadvantage here is that the determination of a Regeneration need in all operating phases of the motor vehicle is carried out according to the same criteria. However, since in a no-load phase substantially lower exhaust gas flows and thus with initiated NO x regeneration lower reducing agent mass flows are present, the re-desorbed NO x can only be reduced incomplete on the catalyst component. In addition to the undesirably high NO x emissions during the NO x regeneration, a regeneration-related excess consumption in the idling phase is higher than in phases of high load requirements for the internal combustion engine. Another disadvantage is that the NO x regeneration in idle often accompanied by an undesirable noise. In addition, NO x regenerations in idle take longer due to the lower exhaust flows, and the consumption-less operation must therefore be maintained longer.
Aufgabe der vorliegenden Erfindung ist es daher, ein Verfahren und eine Vorrichtung zur Verfügung zu stellen, mit denen die geschilderten Nachteile des Standes der Technik überwunden werden können. Die gefundene Lösung soll sich dabei in einfacher Weise in bereits regelungstechnisch bewährten Modellen integneren lassen.The object of the present invention is therefore to provide a method and a device with which the described disadvantages of the prior art can be overcome. The solution found should be able to be integrated easily in already proven control models.
Erfindungsgemäß wird diese Aufgabe durch die Vorrichtung und das Verfahren zur Steuerung der NOx-Regeneration des NOx-Speicherkatalysator mit den in den unabhängigen Ansprüchen genannten Merkmalen gelöst. Dadurch, kann zum Beispiel eine Magerphase im Leerlaufbet ieb bis zur nächsten zwingend erforderlichen NOx-Regeneration verlängert werden beziehungsweise entsprechend den vorgegebenen Zeitintervallen geregelt werden.According to the invention, this object is achieved by the device and the method for controlling the NO x regeneration of the NO x storage catalytic converter with the features mentioned in the independent claims. As a result, for example, a lean phase in Leerlaufbet ieb until the next mandatory required NO x regeneration be extended or be controlled according to the predetermined time intervals.
Die erfindungsgemäße Vorrichtung besitzt dabei Mittel, mit denen die Verfahrensschritte durchführbar sind. Ein solches Mittel ist vorzugsweise ein Steuergerät, in dem eine Prozedur in digitalisierter Form hinterlegt ist, die die Steuerung der NOx-Regeneration im Leerlauf ermöglicht. Das Steuergerät kann als selbständige Steuereinheit realisiert werden oder aber auch in ein bereits häufig vorhandenes Motorsteuergerät integriert werden.The device according to the invention has means with which the method steps can be carried out. Such means is preferably a control unit in which a procedure is stored in digitized form, which allows the control of the NO x regeneration at idle. The control unit can be realized as an independent control unit or else integrated into an already frequently existing engine control unit.
Wird während eines Wechsels in den Leerlauf gerade eine NOx-Regeneration durchgeführt, so wird diese in bevorzugter Weise zu Ende geführt, wenn der Wechsel in den Leerlauf in einer Schubabschaltungsphase erfolgt, eine Drehzahl oberhalb eines vorgegebenen Schwellenwertes liegt oder eine Kraftfahrzeuggeschwindigkeit noch eine vorgegebene Grenzgeschwindigkeit übersteigt. Bei Unterbrechung der NOx-Regeneration wird ein Merker gesetzt, der dazu führt, dass die NOx-Regeneration in einer sich anschließenden Beschleunigungsphase fortgeführt wird. Selbstverständlich wird der Merker zurückgenommen, wenn bereits eine NOx-Regeneration im Leerlaufbetrieb durchgeführt werden musste.If a NO x regeneration is being carried out during a change to idling, this is preferably completed when the change to idling takes place in a fuel cut-off phase, a rotational speed is above a predetermined threshold value or a motor vehicle speed is still a predetermined limit speed exceeds. When the NO x regeneration is interrupted, a flag is set which causes the NO x regeneration to be continued in a subsequent acceleration phase. Of course, the flag is withdrawn if an NO x regeneration had to be carried out in idle mode already.
Weiterhin ist bevorzugt, die NOx-Regeneration unter Vorgabe eines Lambdawertes im Bereich von 0,85 bis 1,0 durchzuführen. Auf alle Fälle sollte die NOx-Regeneration jedoch weniger fett als bei sonst üblichen NOx-Regenerationen durchgeführt werden. Hierdurch lässt sich die Lärmentwicklung im Vergleich zur "normalen" NOx-Regeneration bei Lambdawerten, die deutlich geringer sind als 0,85, herabsetzen. In einer weiteren bevorzugten Ausgestaltung des Verfahrens wird eine NOx-Regeneration im Leerlauf immer dann eingeleitet, wenn aus irgendeinem Grund ein Wechsel in einen λ=1-Betrieb erforderlich ist. Dies kann beispielsweise der Fall sein, wenn ein Druck in einem Bremskraftverstärker erhöht werden soll.Furthermore, it is preferable to carry out the NO x regeneration while specifying a lambda value in the range from 0.85 to 1.0. In any case, the NO x regeneration should be performed less fat than normal NO x regeneration. As a result, the noise development in comparison to the "normal" NO x regeneration at lambda values, which are significantly lower than 0.85, reduce. In a further preferred embodiment of the method, an NO x regeneration is initiated at idle whenever a change to a λ = 1 operation is required for some reason. This may for example be the case when a pressure in a brake booster to be increased.
Insgesamt kann durch die genannten Maßnahmen eine Anzahl an NOx-Regenerationen im Leerlaufbetrieb gegenüber den sonstigen Betriebsphasen des Kraftfahrzeuges gemindert werden, so dass Kraftstoffverbrauch, NOx-Emission während der NOx-Regeneration und die Lärmentwicklung verringert werden.Overall, a number of NO x regenerations in idle mode compared to the other operating phases of the motor vehicle can be reduced by the measures mentioned, so that fuel consumption, NO x emissions during the NO x regeneration and the noise are reduced.
Weitere bevorzugte Ausgestaltungen der Erfindung ergeben sich aus den übrigen, in den Unteransprüchen genannten Merkmalen.Further preferred embodiments of the invention will become apparent from the remaining, mentioned in the dependent claims characteristics.
Die Erfindung wird nachfolgend in einem Ausführungsbeispiel anhand der zugehörigen Zeichnungen näher erläutert. Es zeigen:
- Figur 1
- ein Prinzipschaltbild einer Verbrennungskraftmaschine mit einem im Abgasstrang angeordneten NOx-Speicherkatalysator und
- Figur 2
- ein Blockschaltbild zur Steuerung einer NOx-Regeneration des NOx-Speicherkatalysators im Leerlauf.
- FIG. 1
- a schematic diagram of an internal combustion engine with an arranged in the exhaust line NO x storage catalytic converter and
- FIG. 2
- a block diagram for controlling a NO x regeneration of the NO x storage catalytic converter in idle.
Die Figur 1 zeigt eine Verbrennungskraftmaschine 10 mit einem nachfolgend im Abgasstrang 12 angeordneten NOx-Speicherkatalysator 14. Hierbei ist dem Abgasstrang 12 eine geeignete Sensorik zur Erfassung der Luftverhältnisse im Abgas oder der Anteile spezifischer Schadstoffkomponenten zugeordnet. So kann beispielsweise ein Gassensor 16 als Lambdasonde und ein Gassensor 18 als NOx-sensitive Messeinrichtung vorgesehen sein. Die durch die Sensorik erfassten Daten werden in bekannter Weise in einem Motorsteuergerät 20 zur Verfügung gestellt. In dem Motorsteuergerät 20 sind in digitalisierter Form Modelle hinterlegt, mit denen Stellgrößen für der Verbrennungskraftmaschine 10 zugeordneten Komponenten ermittelt werden. Die Komponenten erlauben eine Beeinflussung des Verbrennungsvorganges hinsichtlich eines Luftverhältnisses, eines Zündwinkels oder auch einer eingespritzten Kraftstoffmasse. So kommen beispielsweise als Stellgrößen in Frage ein Öffnungswinkel eines Abgasrückführventils 22 oder eine Stellung einer Drosselklappe 24. Die Vorrichtung und das Verfahren zur Regulierung des Verbrennungsvorganges sind hinreichend bekannt und werden daher an dieser Stelle nicht näher erläutert.1 shows an
Daneben werden weitere Zustandsparameter, wie zum Beispiel eine Drosselklappenstellung oder ein Fahrpedalwinkel, in das Motorsteuergerät 20 eingelesen, mit denen in bekannter Weise ermittelt werden kann, ob sich das Kraftfahrzeug in einer Phase des Leerlaufes befindet. Dieser Status des Kraftfahrzeuges wird anschließend in ein Steuergerät 36 eingelesen, das hier in dem Motorsteuergerät 20 implementiert ist.In addition, other state parameters, such as a throttle position or an accelerator pedal angle, are read into the
Herrscht ein Sauerstoffüberschuss während des Verbrennungsvorganges eines Luft-Kraftstoff-Gemisches, ist eine NOx-Rohemission der Verbrennungskraftmaschine 10 erhöht und gleichzeitig sind die zur Konvertierung von NOx benötigten Reduktionsmittel Kohlenmonoxid CO und unvollständig verbrannte Kohlenwasserstoffe HC gemindert. Da sich dieser Betriebsbereich als besonders verbrauchsgünstig erwiesen hat, muss zur Vermeidung von NOx-Emissionen das NOx in einer Speicherkomponente des NOx-Speicherkatalysators 14 absorbiert werden. Erfolgt ein Wechsel in den stöchiometrischen oder fetten Betrieb, wird das in Form von Nitrat gespeicherte NOx zumindest unmittelbar nach Wechsel der atmosphärischen Bedingungen im NOx-Speicherkatalysator 14 wieder sehr schnell desorbiert. Bei zu niedrigen Reduktionsmittelmassenströmen ist dann eine Bereitstellung der Reduktionsmittel an der Katalysatorkomponente des NOx-Speicherkatalysators nicht in dem notwendigen Maße möglich, so dass unerwünschte NOx-Emissionen auftreten können.If an excess of oxygen prevails during the combustion process of an air-fuel mixture, a NO x raw emission of the
Mit Hilfe des nachfolgend geschilderten Verfahrens (siehe Figur 2) ist es unter anderem möglich, in der durch niedrige Abgasströme gekennzeichneten Leerlaufphase den Magerbetrieb länger aufrechtzuerhalten und damit eine Anzahl von NOx-Regenerationen im Leerlaufbetrieb gegenüber anderen Betriebsphasen zu reduzieren. Weiterhin kann eine Lärmentwicklung durch die NOx-Regeneration unterdrückt werden.With the aid of the method described below (see FIG. 2), it is possible, inter alia, to maintain lean operation for a longer period in the idling phase characterized by low exhaust gas flows and thus to reduce a number of NO x regeneration generations in idling mode compared to other operating phases. Furthermore, a noise development can be suppressed by the NO x regeneration.
Zunächst wird in einer ersten Abfrage ermittelt, ob sich das Kraftfahrzeug in einer Leerlaufphase befindet (Schritt S1). Ist dies zu verneinen, so kann die NOx-Regeneration des NOx-Speicherkatalysators 14 nach einem herkömmlichen Verfahren gesteuert werden. Dazu wird ein Beladungszustand des NOx-Speicherkatalysators 14 oder eine NOx-Emission stromab des NOx-Speicherkatalysators 14 überwacht wird (Schritt S2). Beim Überschreiten eines Schwellenwertes für diese Größe wird die NOx-Regeneration durch einen Wechsel in den stöchiometrischen oder fetten Betrieb initiiert.First, it is determined in a first query whether the motor vehicle is in an idling phase (step S1). If this is negative, the NO x regeneration of the NO x storage catalyst 14 may be controlled by a conventional method. For this purpose, a loading state of the NO x storage
Liegt eine Leerlaufphase vor, so wird zunächst in einer sich anschließenden Abfrage (Schritt S3) ermittelt, ob der Wechsel in den Leerlauf während einer laufenden NOx-Regeneration stattfindet. Ist dies zu bejahen, so wird im Schritt S4 ermittelt, ob eine Schubabschaltungsphase vorliegt und/oder das Kraftfahrzeug noch eine Geschwindigkeit aufweist, die oberhalb einer vorgegebenen Grenzgeschwindigkeit liegt, und/oder eine Drehzahl einen vorgegebenen Schwellenwert übersteigt. Liegen diese Randbedingungen vor, so wird zunächst die NOx-Regeneration zu Ende geführt (Schritt S5). Ansonsten wird die laufende NOx-Regeneration unterbrochen und ein Merker gesetzt (Schritt S6). Mit Hilfe des Merkers wird sichergestellt, dass nach Ende der Leerlaufphase, beispielsweise in einer sich anschließenden Beschleunigungsphase des Kraftfahrzeuges, die NOx-Regeneration wieder aufgenommen wird.If there is an idling phase, it is first determined in a subsequent query (step S3) whether the change to idling takes place during a running NO x regeneration. If this is affirmative, it is determined in step S4 whether there is a fuel cut-off phase and / or the motor vehicle still has a speed which is above a predetermined limit speed and / or a speed exceeds a predetermined threshold value. If these boundary conditions prevail, the NO x regeneration is first completed (step S 5). Otherwise, the current NO x regeneration is interrupted and a flag is set (step S6). With the help of the flag ensures that after the end of the idle phase, for example, in a subsequent acceleration phase of the motor vehicle, the NO x regeneration is resumed.
Den Schritten S5 und S6 oder wenn der Wechsel in den Leerlauf nicht während einer laufenden NOx-Regeneration erfolgt (Schritt S3) schließt sich eine Neufestlegung der Schwellenwerte zur Bestimmung der Regenerationsnotwendigkeit an (Schritt S7). Dazu werden die in den herkömmlichen Verfahren genutzten Schwellenwerte für den Beladungszustand beziehungsweise die NOx-Emission erhöht. Selbstverständlich sind die Werte so festzulegen, dass es im Leerlauf nicht zu erheblichen NOx-Durchbrüchen kommen kann Aufgrund der geringen Abgasmassenströme kann dies jedoch auch mit höheren Schwellenwerten als für die anderen Betriebsphasen der Verbrennungskraftmaschine 10 sichergestellt werden.Steps S5 and S6, or if the change in the idling does not take place during an ongoing NO x regeneration (step S3) is followed by a redefinition of the thresholds for determining the need for regeneration (step S7). To the thresholds for the load state or the NO x emission used in the conventional methods are increased. Of course, the values are to be determined so that no significant NO x breakthroughs can occur at idling. However, due to the low exhaust gas mass flows, this can also be ensured with higher threshold values than for the other operating phases of the
Alternativ zu letzterer Vorgehensweise kann im Schritt S7 ein festes Zeitintervall vorgegeben werden, nach dessen Ablauf die NOx-Regeneration durchgeführt werden muss. Neben der geschilderten Vorgehensweise zur Regelung der NOx-Regeneration im Leerlauf hat es sich als vorteilhaft erwiesen, das Luftverhältnis während der NOx-Regeneration auf einen Wert im Bereich von λ = 0,85 bis 1,0 und zumindest weniger fett als bei sonst üblichen NOx-Regenerationen festzulegen, da dann die Lärmentwicklung wesentlich geringer ist.As an alternative to the latter procedure, a fixed time interval can be specified in step S7, after which the NO x regeneration must be performed. In addition to the described procedure for regulating the NO x regeneration during idling, it has proved to be advantageous, the air ratio during the NO x regeneration to a value in the range of λ = 0.85 to 1.0 and at least less fat than usual set normal NO x regenerations, since then the noise is much lower.
- 1010
- VerbrennungskraftmaschineInternal combustion engine
- 1212
- Abgasstrangexhaust gas line
- 1414
- NOx-SpeicherkatalysatorNO x storage catalyst
- 1616
- Gassensorgas sensor
- 1818
- Gassensorgas sensor
- 2020
- MotorsteuergerätEngine control unit
- 2222
- AbgasrückführventilExhaust gas recirculation valve
- 2424
- Drosselklappethrottle
- 3636
- Steuergerätcontrol unit
Claims (7)
- Method for controlling an NOx regeneration of an NOx storage catalyst (14) arranged in the exhaust-gas duct (12) of a combustion engine (10) for motor vehicles, wherein the NOx regeneration is initiated at least when a threshold value for a loading condition of the NOx storage catalyst (14) or a threshold value for an NOx emission downstream of the NOx storage catalyst (14) is exceeded,
characterised in that(a) it is determined, whether the combustion engine (10) is operating in an idling mode, and,(b) if an idling mode is present, one of the following measures is taken either alternatively or in any desired combination:- an increase of the threshold value for the loading condition of the NOx storage catalyst (14) or for the NOx emission downstream of the NOx storage catalyst (14),- an initiation of the NOx regeneration only after the expiry of a predetermined time interval and- an interruption of an ongoing NOx regeneration in the event of a change into an idling mode, if at least one of the following marginal conditions is present:- an overrun fuel cutoff phase is not present,- a vehicle velocity does not exceed a predetermined threshold velocity and/or- an engine speed is not disposed above a predetermined threshold value. - Method according to claim 1,
characterised in that,
in the case of an interruption of an ongoing NOx regeneration in the event of a change into an idling mode, a marker is set, which leads to a continuation of the NOx regeneration in a subsequent acceleration phase of the motor vehicle. - Method according to claim 2,
characterised in that
the marker is withdrawn, if it has already been necessary to implement an NOx regeneration in the idling mode. - Method according to any one of the preceding claims,
characterised in that
the NOx regeneration is implemented in an idling mode subject to the condition of a less rich lambda value than for an NOx regeneration in a non-idling mode, especially with a lambda value within the range from 0.85 to 1.0. - Device for controlling an NOx regeneration of an NOx storage catalyst arranged in the exhaust-gas duct of a combustion engine for motor vehicles, with which the NOx regeneration is initiated at least when a threshold value for a loading condition of the NOx storage catalyst or a threshold value for an NOx emission downstream of the NOx storage catalyst is exceeded,
characterised in that
means are provided, with which(a) it is determined, whether the combustion engine (10) is operating in an idling mode, and,(b) if an idling mode is present, one of the following measures is taken either alternatively or in any desired combination:- an increase of the threshold value for the loading condition of the NOx storage catalyst (14) or for the NOx emission downstream of the NOx storage catalyst (14),- an initiation of the NOx regeneration only after the expiry of a predetermined time interval and- an interruption of an ongoing NOx regeneration in the event of a change into an idling mode, if at least one of the following marginal conditions is present:- an overrun fuel cutoff phase is not present,- a vehicle velocity does not exceed a predetermined velocity threshold and/or- an engine speed is not disposed above a predetermined threshold value. - Device according to claim 5,
characterised in that
the means comprise a control device (36), in which a procedure for controlling the NOx regeneration of the NOx storage catalyst (14) in the idling mode is stored in digital form. - Device according to claim 6,
characterised in that
the control device (36) is integrated into an engine-control device (20).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10007049 | 2000-02-17 | ||
| DE10007049A DE10007049A1 (en) | 2000-02-17 | 2000-02-17 | Controling oxides of nitrogen storage catalyser regeneration involves detecting idling, raising threshold in idling state, initiating regeneration after period, stopping if idling resumes |
| PCT/EP2001/000336 WO2001061173A1 (en) | 2000-02-17 | 2001-01-12 | Device and method for controlling the nox regeneration of a nox storage catalyst |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1259718A1 EP1259718A1 (en) | 2002-11-27 |
| EP1259718B1 true EP1259718B1 (en) | 2005-09-21 |
| EP1259718B8 EP1259718B8 (en) | 2006-03-01 |
Family
ID=7631189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01909616A Expired - Lifetime EP1259718B8 (en) | 2000-02-17 | 2001-01-12 | Device and method for controlling the nox- regeneration of a nox-storage catalyst |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1259718B8 (en) |
| JP (1) | JP4421162B2 (en) |
| CN (1) | CN100340755C (en) |
| AT (1) | ATE305087T1 (en) |
| DE (2) | DE10007049A1 (en) |
| WO (1) | WO2001061173A1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2833993B1 (en) * | 2001-12-26 | 2004-06-25 | Renault | METHOD FOR MANAGING THE OPERATION OF ACTIVE AFTER-TREATMENT DEVICES INSERTED IN THE EXHAUST LINE OF AN INTERNAL COMBUSTION ENGINE |
| JP3812653B2 (en) * | 2002-01-17 | 2006-08-23 | 三菱自動車工業株式会社 | Exhaust gas purification device for vehicle internal combustion engine |
| DE10242914B4 (en) * | 2002-09-16 | 2006-01-12 | Siemens Ag | Method for adapting the raw NOx emission in internal combustion engines |
| DE10305635B4 (en) * | 2003-02-11 | 2011-01-13 | Continental Automotive Gmbh | Emission control method for lean-burn engines |
| FR2862103B1 (en) * | 2003-11-07 | 2006-02-17 | Peugeot Citroen Automobiles Sa | SYSTEM FOR AIDING THE REGENERATION OF INTEGRATED EMISSION MEANS IN AN EXHAUST LINE OF A DIESEL ENGINE OF A MOTOR VEHICLE |
| FR2862098B1 (en) * | 2003-11-07 | 2006-02-17 | Peugeot Citroen Automobiles Sa | SYSTEM FOR AIDING THE REGENERATION OF INTEGRATED EMISSION MEANS IN AN EXHAUST LINE OF A VEHICLE DIESEL ENGINE |
| FR2862099B1 (en) | 2003-11-07 | 2006-04-14 | Peugeot Citroen Automobiles Sa | SYSTEM FOR AIDING THE REGENERATION OF INTEGRATED EMISSION MEANS IN AN EXHAUST LINE OF A VEHICLE DIESEL ENGINE |
| FR2862096B1 (en) | 2003-11-07 | 2006-02-17 | Peugeot Citroen Automobiles Sa | SYSTEM FOR AIDING THE REGENERATION OF INTEGRATED EMISSION MEANS IN AN EXHAUST LINE OF A VEHICLE ENGINE |
| FR2862097B1 (en) | 2003-11-07 | 2006-02-17 | Peugeot Citroen Automobiles Sa | SYSTEM FOR AIDING THE REGENERATION OF INTEGRATED EMISSION MEANS IN AN EXHAUST LINE OF A VEHICLE DIESEL ENGINE |
| DE102011101079B4 (en) * | 2011-05-10 | 2020-08-20 | Umicore Ag & Co. Kg | Process for the regeneration of NOx storage catalytic converters in diesel engines with low-pressure EGR |
| JP6481392B2 (en) * | 2015-02-02 | 2019-03-13 | いすゞ自動車株式会社 | Exhaust purification system |
| CN104929736B (en) * | 2015-07-13 | 2017-11-10 | 潍柴动力股份有限公司 | The control method of the vehicle-mounted Catalyst Regeneration of combustion gas |
| DE102017223819A1 (en) * | 2017-12-27 | 2019-06-27 | Hyundai Motor Company | Regeneration system, vehicle comprising same and regeneration method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0752521B1 (en) * | 1995-01-20 | 2001-04-04 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas cleaning method for internal combustion engine |
| DE19636790A1 (en) * | 1996-09-11 | 1998-03-12 | Volkswagen Ag | NOx emission control process |
| DE19640161A1 (en) * | 1996-09-28 | 1998-04-02 | Volkswagen Ag | NOx emission control process |
| DE19716275C1 (en) * | 1997-04-18 | 1998-09-24 | Volkswagen Ag | Process for reducing nitrogen oxide in the exhaust gas of an internal combustion engine |
| DE19758018A1 (en) * | 1997-12-29 | 1999-07-01 | Volkswagen Ag | Regeneration of a NOx storage catalytic converter of an internal combustion engine |
| DE19828609A1 (en) * | 1998-06-26 | 1999-12-30 | Siemens Ag | Regenerating a nitrogen oxides storage catalyst arranged in the exhaust gas stream of an IC engine |
-
2000
- 2000-02-17 DE DE10007049A patent/DE10007049A1/en not_active Withdrawn
-
2001
- 2001-01-12 JP JP2001559998A patent/JP4421162B2/en not_active Expired - Fee Related
- 2001-01-12 AT AT01909616T patent/ATE305087T1/en not_active IP Right Cessation
- 2001-01-12 WO PCT/EP2001/000336 patent/WO2001061173A1/en active IP Right Grant
- 2001-01-12 EP EP01909616A patent/EP1259718B8/en not_active Expired - Lifetime
- 2001-01-12 DE DE50107485T patent/DE50107485D1/en not_active Expired - Lifetime
- 2001-01-12 CN CNB018049877A patent/CN100340755C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN100340755C (en) | 2007-10-03 |
| WO2001061173A1 (en) | 2001-08-23 |
| ATE305087T1 (en) | 2005-10-15 |
| DE50107485D1 (en) | 2006-02-02 |
| JP4421162B2 (en) | 2010-02-24 |
| DE10007049A1 (en) | 2001-08-23 |
| EP1259718A1 (en) | 2002-11-27 |
| EP1259718B8 (en) | 2006-03-01 |
| CN1401054A (en) | 2003-03-05 |
| JP2003522897A (en) | 2003-07-29 |
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