EP1259718B8 - Device and method for controlling the nox- regeneration of a nox-storage catalyst - Google Patents

Device and method for controlling the nox- regeneration of a nox-storage catalyst Download PDF

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Publication number
EP1259718B8
EP1259718B8 EP01909616A EP01909616A EP1259718B8 EP 1259718 B8 EP1259718 B8 EP 1259718B8 EP 01909616 A EP01909616 A EP 01909616A EP 01909616 A EP01909616 A EP 01909616A EP 1259718 B8 EP1259718 B8 EP 1259718B8
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EP
European Patent Office
Prior art keywords
regeneration
idle
storage catalyst
initiated
internal combustion
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EP01909616A
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German (de)
French (fr)
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EP1259718B1 (en
EP1259718A1 (en
Inventor
Hermann Hahn
Sören HINZE
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Volkswagen AG
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Volkswagen AG
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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
    • 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
    • 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
    • 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
    • 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 a device and a method for controlling a NO x regeneration of a NO x storage catalytic converter arranged in the exhaust line of an internal combustion engine for motor vehicles with the features mentioned in the preambles of the independent claims
  • the exhaust gas cleaning system usually comprises components such as particle filters or catalysts. If a raw NO x emission of the internal combustion engine is to be reduced, these catalysts include a reduction catalyst if the mass flows of reducing pollutants such as carbon monoxide CO and incompletely burned hydrocarbons HC are sufficiently high in the area of the reduction catalytic converter is converted to nitrogen using the reducing agents NO x
  • the catalyst is a Assigned NO x memory, which absorbs the NO x as nitrate.
  • the NO x memory can be combined with the catalyst as a so-called NO x memory catalyst
  • a storage capacity of the NO x storage catalytic converter is naturally limited in quantity, so that to avoid NO x breakthroughs, a NO x regeneration must take place at regular intervals.
  • NO x regeneration there is a change in the stoichiometric or rich operation NO x absorbed by nitrate is released again.
  • the NO x regeneration is usually started when a threshold value for a loaded state of the NO x storage catalytic converter or a NO x emission (breakthrough emission) detected downstream by a NO x sensor measuring device is exceeded.
  • the disadvantage here is that the determination of a The need for regeneration in all operating phases of the motor vehicle is based on the same criteria.
  • the NO x regeneration is initiated only after predetermined time intervals and
  • a lean phase in the idle period can be extended to the next mandatory NO x regeneration or be regulated according to the specified time intervals
  • the device according to the invention has means with which the described method steps can be carried out.
  • Such means is preferably a control device in which a procedure is stored in digitized form that enables control of the NO x regeneration in idle mode.
  • the control device can be implemented as an independent control unit are or can also be integrated into an already frequently existing engine control unit
  • a NO x regeneration is currently 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 speed is above a predetermined threshold value or a motor vehicle speed still exceeds a predetermined limit speed If the NO x regeneration is interrupted, a flag is set which leads to the NO x regeneration being continued in a subsequent acceleration phase. Of course, the flag is withdrawn if a NO x regeneration had to be carried out in idle mode
  • NO x -Regenerat ⁇ on under specification of a lambda value in the range of 0.85 to 1, 0 by feeds on any case, the NO x should -Regenerat ⁇ on but less fat than usual NO x -Regenerat ⁇ onen be carried out this way, let the Larger development in comparison to the "normal" NO x regeneration at lambda values that are significantly less than 0.85, decrease
  • the measures mentioned can reduce the number of NO x regenerations in idle mode compared to the other operating phases of the motor vehicle, so that fuel consumption, NO x emissions during NO x regeneration and the development of larvae are reduced
  • FIG. 1 shows a circuit diagram of an internal combustion engine with a NO x storage catalytic converter arranged in the exhaust line and
  • FIG. 2 shows a block diagram for controlling a NO x regeneration of the NO x .
  • FIG. 1 shows an internal combustion engine 10 with a NO x storage catalytic converter 14 arranged subsequently in the exhaust line 12.
  • a suitable sensor system for detecting the air conditions in the exhaust gas or the proportions of specific pollutant components is assigned to the exhaust line 12.
  • a gas sensor 16 as a lambda sensor and a gas sensor 18 can be provided as a NO x -sens ⁇ t ⁇ ve measuring device.
  • the data recorded by the sensors are made available in a known manner in an engine control unit 20.
  • models are stored in digitized form with which actuating variables for the components assigned to the internal combustion engine 10 are determined allow an influencing of the combustion process with regard to an air ratio, a ignition angle or also an injected fuel mass.
  • an opening angle of an exhaust gas recirculation valve 22 o can be used as manipulated variables the one position of a throttle valve 24
  • the device and the method for regulating the combustion process are sufficiently known and are therefore not explained in more detail here
  • an NO x raw emission of the internal combustion engine 10 is increased and at the same time the reducing agents carbon monoxide CO and incompletely burned hydrocarbons HC required for converting NO x are reduced since this operating range has proven to be particularly economical has to avoid NO x emissions, the NO in a storage component of the NO x Storage catalyst 14 are absorbed If there is a change to stoichiometric or rich operation, the NO x stored in the form of nitrate is desorbed again very quickly, at least immediately after the atmospheric conditions have changed in the NO x storage catalyst 14. If the reducing agent mass flows are too low, the reducing agents are then available the catalyst component of the NO x storage catalytic converter is not possible to the extent necessary that undesirable NO x emissions can occur
  • step S1 it is determined in a first query whether the motor vehicle is in an idling phase (step S1). If this is not the case, then the NO x regeneration of the NO ⁇ storage catalytic converter 14 can be controlled using a conventional method. For example, 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 are monitored (step S2). If a threshold value for this size is exceeded, the NO x regeneration is initiated by a change in stoichiometric or rich operation
  • a subsequent query (step S3) first determines whether the change to idle takes place during an ongoing NO x regeneration. If the answer is in the affirmative, it is determined in step S4 whether there is an overrun fuel cut-off phase and / or the motor vehicle still has a speed that is above a predetermined limit speed, and / or a rotational speed exceeds a predetermined threshold value. If these boundary conditions exist, the NO regeneration is first completed (step S5). Otherwise, the ongoing NO x regeneration is interrupted and a flag is set (step S6) The flag is used to ensure that after the end of the idling phase, for example in a subsequent acceleration phase of the motor vehicle, the NO x regeneration is resumed
  • Steps S5 and S6 or if the change to idle does not take place during an ongoing NO x regeneration is followed by a redefinition of the threshold values for determining the need for regeneration (step S7) the threshold values for the state of loading or the NO x emissions used in the conventional methods are increased.
  • the values are to be set in such a way that no significant NO x breakthroughs can occur during idling be ensured for the other operating phases of the internal combustion engine 10
  • a fixed time interval can be specified in step S7, after which the NO x regeneration must be carried out.
  • it has proven to be advantageous to control the air ratio during the NO x -Regenerat ⁇ on to a value in the range of ⁇ 0.85 to 1, 0 and at least less fat than in the usual NO x regeneration, since then the development of larvae is much lower

Abstract

The method involves initiating regeneration at least when a threshold value for a state of charge of the catalyser or an oxides of nitrogen emission downstream of the catalyser is exceeded by detecting whether the engine is in an idling state and alternatively or in combination, increasing the threshold in the idling state, initiating regeneration only after a defined time and interrupting regeneration if a change to idling occurs. Independent claims are also included for the following: a device for controling oxides of nitrogen regeneration of a storage catalyser.

Description

Vorrichtung und Verfahren zur Steuerung einer NOx-Regeneration eines NOx-SpeicherkatalysatorsDevice and method for controlling a NO x regeneration of a NO x storage catalytic converter
Die Erfindung betrifft eine Vorrichtung und ein Verfahren zur Steuerung einer NOx- Regeneration eines im Abgasstrang einer Verbrennungskraftmaschine für Kraftfahrzeuge angeordneten NOx-Speιcherkatalysators mit den in den Oberbegriffen der unabhängigen Ansprüche genannten MerkmalenThe invention relates to a device and a method for controlling a NO x regeneration of a NO x storage catalytic converter arranged in the exhaust line of an internal combustion engine for motor vehicles 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 Abgasremigungsanlage umfasst dabei üblicherweise Komponenten wie Partikelfilter oder Katalysatoren Soll eine NOx- Rohemission der Verbrennungskraftmaschine gemindert werden so umfassen diese Katalysatoren einen Reduktionskatalysator Sofern die Massenstrome 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 konvertiertIt is known for the cleaning of an exhaust gas from internal combustion engines to integrate an exhaust gas cleaning system in the exhaust line. The exhaust gas cleaning system usually comprises components such as particle filters or catalysts. If a raw NO x emission of the internal combustion engine is to be reduced, these catalysts include a reduction catalyst if the mass flows of reducing pollutants such as carbon monoxide CO and incompletely burned hydrocarbons HC are sufficiently high in the area of the reduction catalytic converter is converted to nitrogen using the reducing agents NO x
Unter dem Gesichtspunkt minimierter Kraftstoffverbrauche hat es sich als vorteilhaft erwiesen die Verbrennungskraftmaschine bei mageren Luftverhaltnissen zu betreiben Allerdings ist der Betrieb im verbrauchsoptimierten Bereich einerseits mit erhöhter NOx- Emission und andererseits mit verringerten Reduktionsmittelmassenstromen verbunden Zur Vermeidung hoher NOx-Emιssιonen ist daher dem Katalysator ein NOx-Speιcher zugeordnet, der das NOx als Nitrat absorbiert Der NOx-Speιcher kann mit dem Katalysator als sogenannter NOx-Speιcherkatalysator zusammengefasst werdenFrom the viewpoint of minimized Kraftstoffverbrauche it has proved to be advantageous is the internal combustion engine proved at lean Luftverhaltnissen to operate However, the operation in the consumption-optimized area of a hand x with increased NO - emission and the other hand with reduced reduction agent mass streams To avoid high NO x -Emιssιonen is, therefore, the catalyst is a Assigned NO x memory, which absorbs the NO x as nitrate. The NO x memory can be combined with the catalyst as a so-called NO x memory catalyst
Eine Speicherkapazität des NOx-Speιcherkatalysators ist naturgemäß mengenmäßig beschrankt, so dass zur Vermeidung von NOx-Durchbruchen in regelmäßigen Abstanden eine NOx-Regeneratιon stattfinden muss Wahrend der NOx-Regeneratιon erfolgt ein Wechsel in den stochiometπschen oder fetten Betrieb Das zuvor in Form von Nitrat absorbierte NOx wird wieder freigesetzt Üblicherweise wird die NOx-Regeneratιon in Gang gesetzt, wenn ein Schwellenwert für einen Beladungszustand des NOx-Speιcherkatalysators oder eine stromab durch eine NOx-sensιtιve Messeinrichtung erfasste NOx-Emιssιon (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 Abgasstrome und damit bei eingeleiteter NOx-Regeneratιon geringere Reduktionsmittelmassenstrome vorhanden sind kann das wieder desorbierte NOx nur noch unvollständig an der Katalysatorkomponente reduziert werden Neben der unerwünscht hohen NOx-Emιssιon wahrend der NOx-Regeneratιon ist ein regenerationsbedingter Mehrverbrauch in der Leerlaufphase hoher als in Phasen hoher Lastanforderungen an die Verbrennungskraftmaschine Weiterhin ist nachteilig dass die NOx-Regeneratιon im Leerlauf häufig mit einer unerwünschten Larmentwicklung einhergeht Zusätzlich dauern NOx-Regeneratιonen im Leerlauf wegen der geringeren Abgasstrome langer und der verbrauchsungunstige Betrieb muss daher auch langer aufrechterhalten werdenA storage capacity of the NO x storage catalytic converter is naturally limited in quantity, so that to avoid NO x breakthroughs, a NO x regeneration must take place at regular intervals. During the NO x regeneration, there is a change in the stoichiometric or rich operation NO x absorbed by nitrate is released again. The NO x regeneration is usually started when a threshold value for a loaded state of the NO x storage catalytic converter or a NO x emission (breakthrough emission) detected downstream by a NO x sensor measuring device is exceeded The disadvantage here is that the determination of a The need for regeneration in all operating phases of the motor vehicle is based on the same criteria. However, since in an idling phase there are significantly lower exhaust gas flows and therefore lower reducing agent mass flows when NO x regeneration is initiated, the desorbed NO x can only be reduced incompletely on the catalyst component. In addition to the undesirably high NO x emission during the NO x regeneration, a regeneration-related additional consumption in the idling phase is higher than in phases with high load requirements for the internal combustion engine. It is also disadvantageous that the NO x regeneration during idling is often accompanied by an undesirable development of larges. In addition, NO x regeneration lasts during idling Because of the lower exhaust gas flows, the operation has to be maintained for a longer time and the consumption is less economical
Aufgabe der vorliegenden Erfindung ist es daher ein Verfahren und eine Vorrichtung zur Verfugung zu stellen mit denen die geschilderten Nachteile des Standes der Technik überwunden werden können Die gefundene Losung soll sich dabei in einfacher Weise in bereits regelungstechnisch bewahrten Modellen integrieren lassenThe object of the present invention is therefore to provide a method and a device with which the disadvantages of the prior art described can be overcome
Erfindungsgemaß wird diese Aufgabe durch die Vorrichtung und das Verfahren zurAccording to the invention, this object is achieved by the device and the method for
Steuerung der NOx-Regeneratιon des NOx-Speιcherkatalysator mit den in den unabhängigen Ansprüchen genannten Merkmalen gelost Dadurch dass gemäß dem VerfahrenControl of the NO x regeneration of the NO x storage catalytic converter with the features mentioned in the independent claims solved by the fact that according to the method
(a) erfasst wird ob die Verbrennungskraftmaschine in einen Leerlauf geschaltet ist und(a) it is detected whether the internal combustion engine is switched to idling and
(b) alternativ oder in beliebiger Kombination(b) alternatively or in any combination
- im Leerlauf der Schwellenwert für den Beladungszustand oder die NOx-Emιssιon erhöht wird- The idle value for the state of load or the NO x Emιssιon is increased
- die NOx-Regeneratιon nur nach Ablauf vorgegebener Zeitintervalle eingeleitet wird und- The NO x regeneration is initiated only after predetermined time intervals and
eine laufende NOx-Regeneratιon beim Wechsel in den Leerlauf unterbrochen wirda running NO x regeneration is interrupted when switching to idle
kann zum Beispiel eine Magerphase im Leerlaufbet leb bis zur nächsten zwingend erforderlichen NOx-Regeneratιon verlängert werden be ziehungsweise entsprechend den vorgegebenen Zeitintervallen geregelt werden Die erfindungsgemaße Vorrichtung besitzt dabei Mittel, mit denen die geschilderten Verfahrensschritte durchfuhrbar sind Ein solches Mittel ist vorzugsweise ein Steuergerat, in dem eine Prozedur in digitalisierter Form hinterlegt ist, die die Steuerung der NOx- Regeneration im Leerlauf ermöglicht Das Steuergerat kann als selbständige Steuereinheit realisiert werden oder aber auch in ein bereits häufig vorhandenes Motorsteuergerat integriert werdenFor example, a lean phase in the idle period can be extended to the next mandatory NO x regeneration or be regulated according to the specified time intervals The device according to the invention has means with which the described method steps can be carried out. Such means is preferably a control device in which a procedure is stored in digitized form that enables control of the NO x regeneration in idle mode. The control device can be implemented as an independent control unit are or can also be integrated into an already frequently existing engine control unit
Wird wahrend eines Wechsels in den Leerlauf gerade eine NOx-Regeneratιon durchgeführt, so wird diese in bevorzugter Weise zu Ende gefuhrt, 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-Regeneratιon wird ein Merker gesetzt, der dazu fuhrt, dass die NOx-Regeneratιon in einer sich anschließenden Beschleunigungsphase fortgeführt wird Selbstverständlich wird der Merker zurückgenommen, wenn bereits eine NOx-Regeneratιon im Leerlaufbetrieb durchgeführt werden mussteIf a NO x regeneration is currently 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 speed is above a predetermined threshold value or a motor vehicle speed still exceeds a predetermined limit speed If the NO x regeneration is interrupted, a flag is set which leads to the NO x regeneration being continued in a subsequent acceleration phase. Of course, the flag is withdrawn if a NO x regeneration had to be carried out in idle mode
Weiterhin ist bevorzugt, die NOx-Regeneratιon unter Vorgabe eines Lambdawertes im Bereich von 0,85 bis 1 ,0 durchzufuhren Auf alle Falle sollte die NOx-Regeneratιon jedoch weniger fett als bei sonst üblichen NOx-Regeneratιonen durchgeführt werden Hierdurch lasst sich die Larmentwicklung im Vergleich zur "normalen" NOx-Regeneratιon bei Lambdawerten die deutlich geringer sind als 0,85, herabsetzen In einer weiteren bevorzugten Ausgestaltung des Verfahrens wird eine NOx-Regeneratιon 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 Bremskraftverstarker erhöht werden sollIt is further preferred that NO x -Regeneratιon under specification of a lambda value in the range of 0.85 to 1, 0 by feeds on any case, the NO x should -Regeneratιon but less fat than usual NO x -Regeneratιonen be carried out this way, let the Larger development in comparison to the "normal" NO x regeneration at lambda values that are significantly less than 0.85, decrease In a further preferred embodiment of the method, a NO x regeneration is initiated at idle whenever there is a change to one for some reason λ = 1 operation is required. This can be the case, for example, if a pressure in a brake booster is to be increased
Insgesamt kann durch die genannten Maßnahmen eine Anzahl an NOx-Regeneratιonen im Leerlaufbetrieb gegenüber den sonstigen Betriebsphasen des Kraftfahrzeuges gemindert werden, so dass Kraftstoffverbrauch, NOx-Emιssιon wahrend der NOx-Regeneratιon und die Larmentwicklung verringert werdenOverall, the measures mentioned can reduce the number of NO x regenerations in idle mode compared to the other operating phases of the motor vehicle, so that fuel consumption, NO x emissions during NO x regeneration and the development of larvae are reduced
Weitere bevorzugte Ausgestaltungen der Erfindung ergeben sich aus den übrigen, in den Unteranspruchen genannten Merkmalen Die Erfindung wird nachfolgenc in einem Ausfuhrungsbeispiel anhand der zugehörigen Zeichnungen naher erläutert Es ..eigenFurther preferred embodiments of the invention result from the other features mentioned in the subclaims The invention will be explained in more detail in an exemplary embodiment with reference to the accompanying drawings
Figur 1 ein Pnnzipschaltbild einer Verbrennungskraftmaschine mit einem im Abgasstrang angeordneten NOx-Speιcherkatalysator und1 shows a circuit diagram of an internal combustion engine with a NO x storage catalytic converter arranged in the exhaust line and
Figur 2 ein Blockschaltbild zur Steuerung einer NOx-Regeneratιon des NOx-FIG. 2 shows a block diagram for controlling a NO x regeneration of the NO x .
Speicherkatalysators im LeerlaufStorage catalytic converter in idle
Die Figur 1 zeigt eine Verbrennungskraftmaschine 10 mit einem nachfolgend im Abgasstrang 12 angeordneten NOx-Speιcherkatalysator 14 Hierbei ist dem Abgasstrang 12 eine geeignete Sensorik zur Erfassung der Luftverhaltnisse im Abgas oder der Anteile spezifischer Schadstoffkomponeπten zugeordnet So kann beispielsweise ein Gasseπsor 16 als Lambdasonde und ein Gassensor 18 als NOx-sensιtιve Messeinrichtung vorgesehen sein Die durch die Sensorik erfassten Daten werden in bekannter Weise in einem Motorsteuergerat 20 zur Verfugung gestellt In dem Motorsteuergerat 20 sind in digitalisierter Form Modelle hinterlegt, mit denen Stellgroßen für der Verbrennungskraftmaschine 10 zugeordneten Komponenten ermittelt werden Die Komponenten erlauben eine Beeinflussung des Verbrennungsvorganges hinsichtlich eines Luftverhaltnisses, eines Zundwinkels oder auch einer eingespritzten Kraftstoffmasse So kommen beispielsweise als Stellgroßen in Frage ein Offnungswinkel eines Abgasruckfuhrventils 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 naher erläutert1 shows an internal combustion engine 10 with a NO x storage catalytic converter 14 arranged subsequently in the exhaust line 12. A suitable sensor system for detecting the air conditions in the exhaust gas or the proportions of specific pollutant components is assigned to the exhaust line 12. For example, a gas sensor 16 as a lambda sensor and a gas sensor 18 can be provided as a NO x -sensιtιve measuring device. The data recorded by the sensors are made available in a known manner in an engine control unit 20. In the engine control unit 20, models are stored in digitized form with which actuating variables for the components assigned to the internal combustion engine 10 are determined allow an influencing of the combustion process with regard to an air ratio, a ignition angle or also an injected fuel mass. For example, an opening angle of an exhaust gas recirculation valve 22 o can be used as manipulated variables the one position of a throttle valve 24 The device and the method for regulating the combustion process are sufficiently known and are therefore not explained in more detail here
Daneben werden weitere Zustandsparameter, wie zum Beispiel eine Drosselklappenstellung oder ein Fahrpedalwinkel, in das Motorsteuergerat 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 Steuergerat 36 eingelesen, das hier in dem Motorsteuergerat 20 implementiert istIn addition, further state parameters, such as a throttle valve position or an accelerator pedal angle, are read into the engine control unit 20, which can be used to determine in a known manner whether the motor vehicle is in an idling phase. This status of the motor vehicle is then read into a control unit 36 , which is implemented here in the engine control unit 20
Herrscht ein Sauerstoffuberschuss wahrend des Verbrennungsvorganges eines Luft- Kraftstoff-Gemisches, ist eine NOx-Rohemιssιon der Verbrennungskraftmaschine 10 erhöht und gleichzeitig sind die zur Konvertierung von NOx benotigten Reduktionsmittel Kohlenmonoxid CO und unvollständig verbrannte Kohlenwasserstoffe HC gemindert Da sich dieser Betriebsbereich als besonders verbrauchsgunstig erwiesen hat, muss zur Vermeidung von NOx-Emιssιonen das NO in einer Speicherkomponente des NOx- Speicherkatalysators 14 absorbiert werden Erfolgt ein Wechsel in den stochiometπschen oder fetten Betrieb wird das in Form von Nitrat gespeicherte NOx zumindest unmittelbar nach Wechsel der atmosphärischen Bedingungen im NOx-Speιcherkatalysator 14 wieder sehr schnell desorbiert Bei zu niedrigen Reduktionsmittelmassenstromen ist dann eine Bereitstellung der Reduktionsmittel an der Katalysatorkomponente des NOx- Speicherkatalysators nicht in dem notwendigen Maße möglich so dass unerwünschte NOx- Emissionen auftreten könnenIf there is an excess of oxygen during the combustion process of an air-fuel mixture, an NO x raw emission of the internal combustion engine 10 is increased and at the same time the reducing agents carbon monoxide CO and incompletely burned hydrocarbons HC required for converting NO x are reduced since this operating range has proven to be particularly economical has to avoid NO x emissions, the NO in a storage component of the NO x Storage catalyst 14 are absorbed If there is a change to stoichiometric or rich operation, the NO x stored in the form of nitrate is desorbed again very quickly, at least immediately after the atmospheric conditions have changed in the NO x storage catalyst 14. If the reducing agent mass flows are too low, the reducing agents are then available the catalyst component of the NO x storage catalytic converter is not possible to the extent necessary that undesirable NO x emissions can occur
Mit Hilfe des nachfolgend geschilderten Verfahrens (siehe Figur 2) ist es unter anderem möglich in der durch niedrige Abgasstrome gekennzeichneten Leerlaufphase den Magerbetrieb langer aufrechtzuerhalten und damit eine Anzahl von NOx-Regeneratιonen im Leerlaufbetrieb gegenüber anderen Betriebsphasen zu reduzieren Weiterhin kann eine Larmentwicklung durch die NOx-Regeneratιon unterdruckt werdenWith the help of the method described below (see FIG. 2), it is possible, among other things, to maintain lean operation for a longer period in the idle phase characterized by low exhaust gas flows and thus to reduce the number of NO x regenerations in idle mode compared to other operating phases x regeneration are suppressed
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-Regeneratιon des NOχ-Speιcherkatalysators 14 nach einem herkömmlichen Verfahren gesteuert werden Dazu kann beispielsweise ein Beladungszustand des NOx-Speιcherkatalysators 14 oder eine NOx-Emιssιon stromab des NOx-Speιcherkatalysators 14 überwacht werden (Schritt S2) Beim Überschreiten eines Schwellenwertes für diese Große wird die NOx-Regeneratιon durch einen Wechsel in den stochiometπschen oder fetten Betrieb initiiertFirst, it is determined in a first query whether the motor vehicle is in an idling phase (step S1). If this is not the case, then the NO x regeneration of the NOχ storage catalytic converter 14 can be controlled using a conventional method. For example, 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 are monitored (step S2). If a threshold value for this size is exceeded, the NO x regeneration is initiated by a change in stoichiometric or rich operation
Liegt eine Leerlaufphase vor so wird zunächst in einer sich anschließenden Abfrage (Schritt S3) ermittelt ob der Wechsel in den Leerlauf wahrend einer laufenden NOx-Regeneratιon 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 NO -Regeneratιon zu Ende gefuhrt (Schritt S5) Ansonsten wird die laufende NOx-Regeneratιon 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-Regeneratιon wieder aufgenommen wirdIf there is an idle phase, a subsequent query (step S3) first determines whether the change to idle takes place during an ongoing NO x regeneration. If the answer is in the affirmative, it is determined in step S4 whether there is an overrun fuel cut-off phase and / or the motor vehicle still has a speed that is above a predetermined limit speed, and / or a rotational speed exceeds a predetermined threshold value. If these boundary conditions exist, the NO regeneration is first completed (step S5). Otherwise, the ongoing NO x regeneration is interrupted and a flag is set (step S6) The flag is used to ensure that after the end of the idling 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 wahrend einer laufenden NOx-Regeneratιon 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-Emιssιon erhöht Selbstverständlich sind die Werte so festzulegen, dass es im Leerlauf nicht zu erheblichen NOx-Durchbruchen kommen kann Aufgrund der geringen Abgasmassenstrome kann dies jedoch auch mit höheren Schwellenwerten als für die anderen Betriebsphasen der Verbrennungskraftmaschine 10 sichergestellt werdenSteps S5 and S6 or if the change to idle does not take place during an ongoing NO x regeneration (step S3) is followed by a redefinition of the threshold values for determining the need for regeneration (step S7) the threshold values for the state of loading or the NO x emissions used in the conventional methods are increased. Of course, the values are to be set in such a way that no significant NO x breakthroughs can occur during idling be ensured for the other operating phases of the internal combustion engine 10
Alternativ zu letzterer Vorgehensweise kann im Schritt S7 ein festes Zeitintervall vorgegeben werden, nach dessen Ablauf die NOx-Regeneratιon durchgeführt werden muss Neben der geschilderten Vorgehensweise zur Regelung der NOx-Regeneratιon im Leerlauf hat es sich als vorteilhaft erwiesen, das Luftverhaltnis wahrend der NOx-Regeneratιon 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 Larmentwicklung 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 carried out. In addition to the described procedure for regulating the NO x regeneration during idling, it has proven to be advantageous to control the air ratio during the NO x -Regeneratιon to a value in the range of λ = 0.85 to 1, 0 and at least less fat than in the usual NO x regeneration, since then the development of larvae is much lower
BEZUGSZEICHENLISTELIST OF REFERENCE NUMBERS
Verbrennungskraftmaschine Abgasstrang NOx-Speιcherkatalysator Gassensor Gassensor Motorsteuergerat Abgasruckfuhrventil Drosselklappe Steuergerat Internal combustion engine exhaust system NO x storage catalytic converter gas sensor gas sensor engine control unit exhaust gas recirculation valve throttle valve control unit

Claims

P A T E N TA N S P R Ü C H EP A T E N TA N S P RÜ C H E
Verfahren zur Steuerung einer NOx-Regeneratιon eines im Abgasstrang (12) einer Verbrennungskraftmaschine (10) für Kraftfahrzeuge angeordneten NOx- Speicherkatalysators (14), wobei die NOx-Regeneratιon zumindest dann eingeleitet wird, wenn ein Schwellenwert für einen Beladungszustand des NOx- Speicherkatalysators (14) oder eine NOx-Emιssιon stromab des NOx- Speicherkatalysators (14) überschritten wird, dadurch gekennzeichnet, dassMethod for controlling a NO x regeneration of a NO x storage catalytic converter (14) arranged in the exhaust line (12) of an internal combustion engine (10) for motor vehicles, the NO x regeneration being initiated at least when a threshold value for a loading state of the NO x - Storage catalyst (14) or a NO x emission downstream of the NO x storage catalyst (14) is exceeded, characterized in that
(a) erfasst wird, ob die Verbrennungskraftmaschine (10) in einen Leerlauf geschaltet ist und(a) it is detected whether the internal combustion engine (10) is switched to an idle and
(b) alternativ oder in beliebiger Kombination(b) alternatively or in any combination
im Leerlauf der Schwellenwert für den Beladungszustand oder die NOx- Emission erhöht wird,the idle value for the state of load or the NO x emission is increased,
- die NOx-Regeneratιon nur nach Ablauf vorgegebener Zeitintervalle eingeleitet- The NO x regeneration initiated only after the expiry of predetermined time intervals
eine laufende NOx-Regeneratιon beim Wechsel in den Leerlauf unterbrochenA running NO x regeneration is interrupted when switching to idle
Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass eine laufende NOx- Regeneration beim Wechsel in den Leerlauf nicht unterbrochen wird, wenn eine Schubabschaltungsphase vorliegt, eine Kraftfahrzeuggeschwindigkeit eine vorgegebene Grenzgeschwindigkeit übersteigt oder eine Drehzahl oberhalb eines vorgegebenen Schwellenwertes liegtA method according to claim 1, characterized in that an ongoing NO x regeneration is not interrupted when changing to idle, when there is a fuel cut-off phase, a motor vehicle speed exceeds a predetermined limit speed or a speed is above a predetermined threshold value
Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass bei Unterbrechung einer laufenden NOx-Regeneratιon ein Merker gesetzt wird, der dazu fuhrt, dass die NOx- Regeneration in einer sich anschließenden Beschleunigungsphase des Kraftfahrzeuges fortgeführt wird Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass der Merker zurückgenommen wird, wenn bereits eine NOx-Regeneratιon im Leerlaufbetrieb durchgeführt werden musste.Method according to Claim 2, characterized in that when an ongoing NO x regeneration is interrupted, a flag is set which leads to the NO x regeneration being continued in a subsequent acceleration phase of the motor vehicle A method according to claim 3, characterized in that the flag is withdrawn if a NO x regeneration had to be carried out in idle mode.
Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die NOx-Regeneratιon im Leerlaufbetrieb unter Vorgabe eines Lambdawertes im Bereich von 0,85 bis 1 ,0, auf alle Fälle aber weniger fett als bei sonst üblicher NOx- Regeneration, durchgeführt wird.Method according to one of the preceding claims, characterized in that the NO x regeneration is carried out in idle mode with a lambda value in the range from 0.85 to 1.0, in any case, however, less rich than in the otherwise usual NO x regeneration ,
Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die NOx-Regeneratιon eingeleitet wird, wenn aus irgendeinem Grund ein Wechsel in den Λ.=1 -Betrieb erforderlich ist.Method according to one of the preceding claims, characterized in that the NO x regeneration is initiated if, for any reason, a change to Λ. = 1 operation is required.
Vorrichtung zur Steuerung einer NOx-Regeneratιon eines im Abgasstrang (12) einer Verbrennungskraftmaschine (10) für Kraftfahrzeuge angeordneten NOx-Device for controlling an NO x -Regeneratιon one in the exhaust line (12) of an internal combustion engine (10) for motor vehicles arranged NO x -
Speicherkatalysators (14), mit der die NOx-Regeneratιon zumindest dann eingeleitet wird, wenn ein Schwellenwert für einen Beladungszustand des NOx- Speicherkatalysators (14) oder eine NOx-Emιssιon stromab des NOx- Speicherkatalysators (14) überschritten wird, dadurch gekennzeichnet, dass Mittel vorhanden sind, mit denenStorage catalyst (14) with which the NO x regeneration is initiated at least when a threshold value for a loading state of the NO x storage catalyst (14) or a NO x emission downstream of the NO x storage catalyst (14) is exceeded, thereby characterized that means are available with which
(a) erfasst wird, ob die Verbrennungskraftmaschine (10) in einen Leerlauf geschaltet ist und(a) it is detected whether the internal combustion engine (10) is switched to an idle and
(b) alternativ oder in beliebiger Kombination(b) alternatively or in any combination
im Leerlauf der Schwellenwert für den Beladungszustaπd oder die NO - Emission erhöht wird,the idle value for the loading state or the NO emission is increased,
- die NOx-Regeneration nur nach Ablauf vorgegebener Zeitintervalle eingeleitet wird und- The NO x regeneration is initiated only after predetermined time intervals and
eine laufende NOx-Regeneration beim Wechsel in den Leerlauf unterbrochen wird Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass die Mittel ein Steuergerat (36) umfassen, in dem eine Prozedur zur Steuerung der NOx-Regeneratιon des NOx-Speιcherkatalysators (14) im Leerlauf in digitalisierter Form hinterlegt istan ongoing NO x regeneration is interrupted when switching to idle Apparatus according to claim 7, characterized in that the means comprise a control device (36), in which a procedure for controlling the NO x regeneration of the NO x storage catalyst (14) is stored in digital form in idle mode
Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass das Steuergerat (36) in ein Motorsteuergerat (20) integriert ist Apparatus according to claim 8, characterized in that the control device (36) is integrated in an engine control device (20)
EP01909616A 2000-02-17 2001-01-12 Device and method for controlling the nox- regeneration of a nox-storage catalyst Expired - Lifetime EP1259718B8 (en)

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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

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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
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
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
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
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
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ATE305087T1 (en) 2005-10-15
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JP2003522897A (en) 2003-07-29
DE10007049A1 (en) 2001-08-23
JP4421162B2 (en) 2010-02-24
EP1259718A1 (en) 2002-11-27
DE50107485D1 (en) 2006-02-02
WO2001061173A1 (en) 2001-08-23
CN100340755C (en) 2007-10-03

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