EP1159518A1 - Method for operating a storage catalyst of an internal combustion engine - Google Patents

Method for operating a storage catalyst of an internal combustion engine

Info

Publication number
EP1159518A1
EP1159518A1 EP00991535A EP00991535A EP1159518A1 EP 1159518 A1 EP1159518 A1 EP 1159518A1 EP 00991535 A EP00991535 A EP 00991535A EP 00991535 A EP00991535 A EP 00991535A EP 1159518 A1 EP1159518 A1 EP 1159518A1
Authority
EP
European Patent Office
Prior art keywords
temperature
catalytic converter
storage catalytic
measured
combustion engine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP00991535A
Other languages
German (de)
French (fr)
Inventor
Eberhard Schnaibel
Andreas Koring
Holger Bellmann
Thomas Wahl
Andreas Blumenstock
Klaus Winkler
Frank Stanglmeier
Bernd Schumann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1159518A1 publication Critical patent/EP1159518A1/en
Ceased legal-status Critical Current

Links

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
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
    • 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
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/03—Monitoring or diagnosing the deterioration of exhaust systems of sorbing activity of adsorbents or absorbents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/12—Other methods of operation
    • F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
    • 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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/3011—Controlling fuel injection according to or using specific or several modes of combustion
    • F02D41/3017—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used
    • F02D41/3023—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used a mode being the stratified charge spark-ignited mode
    • F02D41/3029—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used a mode being the stratified charge spark-ignited mode further comprising a homogeneous charge spark-ignited mode
    • 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
    • Y02T10/40—Engine management systems

Definitions

  • the invention relates to a method for operating a storage catalytic converter of an internal combustion engine, in particular a motor vehicle, in which the storage catalytic converter is loaded and unloaded with nitrogen oxides.
  • the invention also relates to a control device for an internal combustion engine, in particular of a motor vehicle, and an internal combustion engine, in particular for a motor vehicle.
  • Such a method, such a control device and such an internal combustion engine are known, for example, in a so-called gasoline direct injection.
  • the fuel is injected into the combustion chamber of the internal combustion engine in homogeneous operation during the intake phase or in stratified operation during the compression phase.
  • Homogeneous operation is preferably provided for full-load operation of the internal combustion engine, while stratified operation is suitable for idling and part-load operation.
  • a direct-injection internal combustion engine switches between the above-mentioned operating modes.
  • a storage catalytic converter with which nitrogen oxides can be temporarily stored in order to reduce them during subsequent homogeneous operation.
  • This storage catalytic converter is loaded with the nitrogen oxides in shift operation and discharged again in homogeneous operation. This loading and unloading, thermal stresses and poisoning lead to an aging of the storage catalytic converter.
  • the object of the invention is to provide a method for operating a storage catalytic converter of an internal combustion engine, with which the aging of the storage catalytic converter can be detected.
  • this object is achieved in that the temperature of the exhaust gas flowing through the storage catalytic converter and / or the temperature of the storage catalytic converter is measured and compared with a threshold value.
  • the task is solved accordingly.
  • Discharging the storage catalytic converter is an exothermic reaction, which therefore releases heat. This leads to an increase in the temperature of the exhaust gases or the storage catalytic converter even during the emission of nitrogen oxides.
  • the aging of the storage catalytic converter leads to a lower storage capacity of nitrogen oxides therein. This is equivalent to a lower temperature increase when the storage catalytic converter is discharged, since fewer nitrogen oxides are to be discharged. This reduction in
  • Temperature rise is therefore a measure of the aging of the Storage catalytic converter.
  • control unit can thus determine the age-related state of the exhaust gas or the storage catalytic converter according to the invention.
  • control unit can conclude that aging is no longer acceptable, in which e.g. Adequate exhaust gas cleaning is no longer guaranteed.
  • the invention therefore enables simple and inexpensive detection of the aging of the storage catalytic converter.
  • the method according to the invention is stable and independent of others
  • the invention is largely independent of changes in the sensors involved.
  • a temperature increase is measured and compared with a modeled temperature increase, and the difference is compared with an upper limit value.
  • an increase in temperature is measured and compared with an increase in temperature which has been measured in a limit catalytic converter, and it becomes the
  • the temperature is measured in and / or immediately after the storage catalytic converter.
  • the accuracy of the entire process can be increased by combining the two temperature measurements.
  • the method according to the invention is used to diagnose the storage capacity of the storage catalytic converter.
  • control element which is provided for a control device of an internal combustion engine, in particular a motor vehicle.
  • a program is stored on the control element, which is executable on a computing device, in particular on a microprocessor, and is suitable for executing the method according to the invention.
  • the invention is thus implemented by a program stored on the control element, so that this control element provided with the program represents the invention in the same way as the method, for the execution of which the program is suitable.
  • an electrical storage medium can be used as the control element, for example a read-only memory or a flash memory.
  • the figure shows an internal combustion engine 1 of a motor vehicle, in which a piston 2 can be moved back and forth in a cylinder 3.
  • the cylinder 3 is provided with a combustion chamber 4 which is delimited inter alia by the piston 2, an inlet valve 5 and an outlet valve 6.
  • An intake pipe 7 is coupled to the inlet valve 5 and an exhaust pipe 8 is coupled to the exhaust valve 6.
  • Combustion chamber 4 Fuel can be injected into combustion chamber 4 via injection valve 9. The fuel in the combustion chamber 4 can be ignited with the spark plug 10.
  • a rotatable throttle valve 11 is accommodated, via which air can be fed to the intake pipe 7.
  • the amount of air supplied is dependent on the angular position of the throttle valve 11.
  • a catalytic converter 12 is accommodated in the exhaust pipe 8 and serves to clean the exhaust gases resulting from the combustion of the fuel.
  • the catalytic converter 12 is a storage catalytic converter 12 ′ which is combined with a three-way catalytic converter 12 ′′.
  • the catalytic converter 12 is thus intended, inter alia, to remove nitrogen oxides (NOx) caching.
  • a temperature sensor 13 is provided in the catalytic converter 12.
  • a temperature sensor 14 is provided in the exhaust pipe immediately after the catalytic converter 12.
  • a control device 18 is acted upon by input signals 19, which represent operating variables of the internal combustion engine 1 measured by sensors.
  • the control unit 18 generates output signals 20 with which the behavior of the internal combustion engine 1 can be influenced via actuators or actuators.
  • the control unit 18 is provided to control and / or regulate the operating variables of the internal combustion engine 1.
  • the control unit 18 is provided with a microprocessor, which has stored a program in a storage medium, in particular in a flash memory, which is suitable for carrying out the control and / or regulation mentioned.
  • Throttle valve 11 partially opened or closed depending on the desired torque.
  • the fuel is injected into the combustion chamber 4 by the injection valve 9 during an induction phase caused by the piston 2.
  • Throttle valve 11 sucked air, the injected fuel is swirled and thus distributed substantially evenly in the combustion chamber 4.
  • the fuel / air mixture is then compressed during the compression phase in order to then be ignited by the spark plug 10.
  • the piston 2 is driven by the expansion of the ignited fuel.
  • the resulting torque depends, among other things, on the position of the throttle valve 11 in homogeneous operation.
  • the fuel / air mixture is set to La bda equal to one if possible.
  • throttle valve 11 is opened wide.
  • the fuel is injected from the injection valve 9 into the combustion chamber 4 during a compression phase caused by the piston 2, specifically locally in the immediate vicinity of the spark plug 10 and at a suitable time before the ignition point. Then the fuel is ignited with the aid of the spark plug 10, so that the piston 2 is driven in the now following working phase by the expansion of the ignited fuel.
  • the resulting torque largely depends on the injected fuel mass in shift operation.
  • the stratified operation is essentially provided for the idle operation and the partial load operation of the internal combustion engine 1.
  • the storage catalytic converter 12 ′ of the catalytic converter 12 is loaded with nitrogen oxides during the shift operation. In a subsequent homogeneous operation, the storage catalytic converter 12 'is discharged again and the nitrogen oxides are reduced by the three-way catalytic converter 12' '.
  • the storage catalytic converter 12 'absorbs sulfur over time during its continuous loading and unloading with nitrogen oxides. This leads to a limitation of
  • Storage capacity of the storage catalytic converter 12 ′ which is referred to below as aging.
  • the discharge of the storage catalytic converter 12 ′ represents an exothermic reaction in which heat is generated. This results in an increase in the temperature of the exhaust gases flowing through the storage catalytic converter 12 '. This temperature increase is measured by the temperature sensor 13 and / or by the temperature sensor 14. At the same time, the exothermic reaction also increases the temperature of the storage catalytic converter 12 'itself alternatively or additionally, the temperature sensor 13 and possibly also the temperature sensor 14 measure.
  • Internal combustion engine 1 monitors. This can be done by comparing the current temperature increase with a temperature increase that occurs with a new one
  • Storage catalyst 12 'or a new catalyst 12 has been measured. Alternatively or additionally, this can be done by comparing the current temperature increase with a modeled temperature increase. Alternatively or additionally, a comparison can also be made with an increase in temperature of a so-called limit catalyst.
  • the limit catalytic converter is a catalytic converter that is just still operational or has just become defective.
  • control unit 18 concludes that the storage catalytic converter 12 'of the catalytic converter 12 has now reached an age which is no longer acceptable in view of adequate exhaust gas purification.
  • the control unit 18 then generates, for example, a signal that can be recognized by the driver or by a workshop and that indicates the required replacement of the storage catalytic converter 12 ′ or the entire catalytic converter 12.
  • the difference to the current temperature increase also becomes larger and larger, so that the difference is compared with an associated upper threshold value, upon reaching which the storage catalytic converter 12 'must be replaced.
  • the difference to the current temperature increase becomes smaller and smaller, so that the difference is compared with an associated lower threshold value, upon reaching which the storage catalytic converter 12 'must be replaced.
  • the comparison can be based on the absolute temperatures.
  • the temperature increase due to the exothermic reaction during the discharge of the storage catalytic converter 12 ′ is synonymous with a maximum temperature that is measured by the temperature sensor 13 and / or the temperature sensor 14. This maximum temperature becomes lower over time due to the aging of the storage catalytic converter 12 '. If the maximum temperature falls below a lower threshold value, the storage catalytic converter 12 'must be replaced.
  • the above procedure may continue throughout the Operation of the internal combustion engine 1 are used. Alternatively or additionally, it is possible to use the method specifically for diagnosing the storage capacity of the storage catalytic converter 12 '.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention relates to an internal combustion engine (1), in particular for a motor vehicle, which is provided with a storage catalyst (12'). Said storage catalyst can be fed with and can discharge nitrous oxides. A temperature sensor (13, 14) is provided for measuring the temperature of the exhaust gas that flows through the storage catalyst (12') and/or for measuring the temperature of the storage catalyst (12'). The measured temperature is compared with a threshold value, using a control device (18).

Description

Verfahren zum Betreiben eines Speicherkatalysators einer BrennkraftmaschineMethod for operating a storage catalytic converter of an internal combustion engine
Stand der TechnikState of the art
Die Erfindung betrifft ein Verfahren zum Betreiben eines Speicherkatalysators einer Brennkraftmaschine insbesondere eines Kraftfahrzeugs, bei dem der Speicherkatalysator mit Stickoxiden be- und entladen wird. Ebenfalls betrifft die Erfindung ein Steuergerät für eine Brennkraftmaschine insbesondere eines Kraftfahrzeugs sowie eine Brennkraftmaschine insbesondere für ein Kraftfahrzeug.The invention relates to a method for operating a storage catalytic converter of an internal combustion engine, in particular a motor vehicle, in which the storage catalytic converter is loaded and unloaded with nitrogen oxides. The invention also relates to a control device for an internal combustion engine, in particular of a motor vehicle, and an internal combustion engine, in particular for a motor vehicle.
Ein derartiges Verfahren, ein derartiges Steuergerät und eine derartige Brennkraftmaschine sind beispielsweise bei einer sogenannten Benzin-Direkteinspritzung bekannt. Dort wird der Kraftstoff in einem Homogenbetrieb während der Ansaugphase oder in einem Schichtbetrieb während der Verdichtungsphase in den Brennraum der Brennkraftmaschine eingespritzt. Der Homogenbetrieb ist vorzugsweise für den Vollastbetrieb der Brennkraftmaschine vorgesehen, während der Schichtbetrieb für den Leerlauf- und Teillastbetrieb geeignet ist. Beispielsweise in Abhängigkeit von dem angeforderten Drehmoment wird bei einer derartigen direkteinspritzenden Brennkraftmaschine zwischen den genannten Betriebsarten umgeschaltet . Insbesondere zur Ausführung des Schichtbetriebs ist es erforderlich, daß ein Speicherkatalysator vorhanden ist, mit dem entstehende Stickoxide zwischengespeichert werden können, um sie während eines nachfolgenden Homogenbetriebs zu reduzieren. Dieser Speicherkatalysator wird im Schichtbetrieb mit den Stickoxiden beladen und im Homogenbetrieb wieder entladen. Dieses Be- und Entladen, thermische Beanspruchungen und Vergiftungen führt zu einer Alterung des Speicherkatalysators.Such a method, such a control device and such an internal combustion engine are known, for example, in a so-called gasoline direct injection. There, the fuel is injected into the combustion chamber of the internal combustion engine in homogeneous operation during the intake phase or in stratified operation during the compression phase. Homogeneous operation is preferably provided for full-load operation of the internal combustion engine, while stratified operation is suitable for idling and part-load operation. For example, depending on the requested torque, such a direct-injection internal combustion engine switches between the above-mentioned operating modes. In particular, in order to carry out shift operation, it is necessary to have a storage catalytic converter with which nitrogen oxides can be temporarily stored in order to reduce them during subsequent homogeneous operation. This storage catalytic converter is loaded with the nitrogen oxides in shift operation and discharged again in homogeneous operation. This loading and unloading, thermal stresses and poisoning lead to an aging of the storage catalytic converter.
Aufgabe und Vorteile der ErfindungObject and advantages of the invention
Aufgabe der Erfindung ist es, ein Verfahren zum Betreiben eines Speicherkatalysators einer Brennkraftmaschine zu schaffen, mit dem die Alterung des Speicherkatalysators erkannt werden kann.The object of the invention is to provide a method for operating a storage catalytic converter of an internal combustion engine, with which the aging of the storage catalytic converter can be detected.
Diese Aufgabe wird bei einem Verfahren der eingangs genannten Art erfindungsgemäß dadurch gelöst, daß die Temperatur des durch den Speicherkatalysator strömenden Abgases und/oder die Temperatur des Speicherkatalysators gemessen und mit einem Schwellwert verglichen wird. Bei einem Steuergerät und einer Brennkraftmaschine der jeweils eingangs genannten Art wird die Aufgabe entsprechend gelöst.In a method of the type mentioned at the outset, this object is achieved in that the temperature of the exhaust gas flowing through the storage catalytic converter and / or the temperature of the storage catalytic converter is measured and compared with a threshold value. In the case of a control device and an internal combustion engine of the type mentioned in the introduction, the task is solved accordingly.
Das Entladen des Speicherkatalysator ist eine exotherme Reaktion, die somit Wärme abgibt. Dies führt zu einer Temperaturerhöhung der Abgase oder des Speicherkatalysators selbst während der Abgabe von Stickoxiden. Das Altern des Speicherkatalysators führt zu einer geringeren Speicherfähigkeit von Stickoxiden in demselben. Dies ist gleichbedeutend mit einer geringeren Temperaturerhöhung beim Entladen des Speicherkatalysators, da weniger Stickoxide zu entladen sind. Diese Verringerung derDischarging the storage catalytic converter is an exothermic reaction, which therefore releases heat. This leads to an increase in the temperature of the exhaust gases or the storage catalytic converter even during the emission of nitrogen oxides. The aging of the storage catalytic converter leads to a lower storage capacity of nitrogen oxides therein. This is equivalent to a lower temperature increase when the storage catalytic converter is discharged, since fewer nitrogen oxides are to be discharged. This reduction in
Temperaturerhöhung ist somit ein Maß für die Alterung der Speicherkatalysators .Temperature rise is therefore a measure of the aging of the Storage catalytic converter.
Durch die erfindungsgemäße Messung der Temperatur des Abgases oder des Speicherkatalysators kann somit durch das Steuergerät auf den altersbedingten Zustand desBy measuring the temperature of the exhaust gas or the storage catalytic converter according to the invention, the control unit can thus determine the age-related state of the
Speicherkatalysators geschlossen werden. Insbesondere kann von dem Steuergerät bei Erreichen eines Schwellwerts auf eine nicht mehr hinnehmbare Alterung geschlossen werden, bei der z.B. eine ausreichende Abgasreinigung nicht mehr gewährleistet ist.Storage catalyst are closed. In particular, when the threshold value is reached, the control unit can conclude that aging is no longer acceptable, in which e.g. Adequate exhaust gas cleaning is no longer guaranteed.
Es ist somit durch die Erfindung eine einfache und kostengünstige Erkennung der Alterung des Speicherkatalysators möglich. Das Verfahren nach der Erfindung ist stabil und unabhängig von sonstigenThe invention therefore enables simple and inexpensive detection of the aging of the storage catalytic converter. The method according to the invention is stable and independent of others
Einflüssen. Insbesondere ist die Erfindung weitgehend unabhängig von Veränderungen beteiligter Sensoren.Influences. In particular, the invention is largely independent of changes in the sensors involved.
Bei einer vorteilhaften Weiterbildung der Erfindung wird eine Temperaturerhöhung gemessen und mit einerIn an advantageous development of the invention, an increase in temperature is measured and with a
Temperaturerhöhung verglichen, die bei einem neuen Speicherkatalysator gemessen worden ist, und es wird die Differenz mit einem oberen Grenzwert verglichen. Alternativ oder zusätzlich wird eine Temperaturerhöhung gemessen und mit einer modellierten Temperaturerhöhung verglichen, und es wird die Differenz mit einem oberen Grenzwert verglichen. Alternativ oder zusätzliche wird eine Temperaturerhöhung gemessen und mit einer Temperaturerhöhung verglichen, die bei einem Grenzkatalysator gemessen worden ist, und es wird dieComparing temperature increase, which has been measured with a new storage catalytic converter, and the difference is compared with an upper limit value. Alternatively or additionally, a temperature increase is measured and compared with a modeled temperature increase, and the difference is compared with an upper limit value. Alternatively or additionally, an increase in temperature is measured and compared with an increase in temperature which has been measured in a limit catalytic converter, and it becomes the
Differenz mit einem unteren Grenzwert verglichen. Alle drei Möglichkeiten erlauben eine einfache und effektive Erkennung des Alterungszustands des Speicherkatalysators.Difference compared to a lower limit. All three options allow simple and effective detection of the aging condition of the storage catalytic converter.
Bei einer weiteren vorteilhaften Weiterbildung derIn a further advantageous development of the
Erfindung wird eine Maximaltemperatur gemessen und mit einem unteren Schwellwert verglichen. Dies ermöglicht eine noch weiter vereinfachte Erkennung des Alterungszustands des Speicherkatalysators.Invention a maximum temperature is measured and with compared to a lower threshold. This enables an even more simplified detection of the aging state of the storage catalytic converter.
Besonders vorteilhaft ist es, wenn die Temperatur in und/oder unmittelbar nach dem Speicherkatalysator gemessen wird. Durch die Kombination der beiden Temperaturmessungen kann die Genauigkeit des gesamten Verfahrens erhöht werden.It is particularly advantageous if the temperature is measured in and / or immediately after the storage catalytic converter. The accuracy of the entire process can be increased by combining the two temperature measurements.
Bei einer vorteilhaften Ausgestaltung der Erfindung wird das erfindungsgemäße Verfahren zur Diagnose der Speicherfähigkeit des Speicherkatalysators verwendet.In an advantageous embodiment of the invention, the method according to the invention is used to diagnose the storage capacity of the storage catalytic converter.
Von besonderer Bedeutung ist die Realisierung des erfindungsgemäßen Verfahrens in der Form eines Steuerelements, das für ein Steuergerät einer Brennkraftmaschine, insbesondere eines Kraftfahrzeugs, vorgesehen ist. Dabei ist auf dem Steuerelement ein Programm abgespeichert, das auf einem Rechengerät, insbesondere auf einem Mikroprozessor, ablauffähig und zur Ausführung des erfindungsgemäßen Verfahrens geeignet ist. In diesem Fall wird also die Erfindung durch ein auf dem Steuerelement abgespeichertes Programm realisiert, so daß dieses mit dem Programm versehene Steuerelement in gleicher Weise die Erfindung darstellt wie das Verfahren, zu dessen Ausführung das Programm geeignet ist. Als Steuerelement kann insbesondere ein elektrisches Speichermedium zur Anwendung kommen, beispielsweise ein Read-Only-Memory oder ein Flash-Memory.Of particular importance is the implementation of the method according to the invention in the form of a control element which is provided for a control device of an internal combustion engine, in particular a motor vehicle. A program is stored on the control element, which is executable on a computing device, in particular on a microprocessor, and is suitable for executing the method according to the invention. In this case, the invention is thus implemented by a program stored on the control element, so that this control element provided with the program represents the invention in the same way as the method, for the execution of which the program is suitable. In particular, an electrical storage medium can be used as the control element, for example a read-only memory or a flash memory.
Weitere Merkmale, Anwendungsmöglichkeiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen der Erfindung, die in der Zeichnung dargestellt sind. Dabei bilden alle beschriebenen oder dargestellten Merkmale für sich oder in beliebiger Kombination den Gegenstand der Erfindung, unabhängig von ihrer Zusammenfassung in den Patentansprüchen oder deren Rückbeziehung sowie unabhängig von ihrer Formulierung bzw Darstellung in der Beschreibung bzw. in der Zeichnung.Further features, possible applications and advantages of the invention result from the following description of exemplary embodiments of the invention, which are shown in the drawing. All of the features described or illustrated form the subject matter of the invention, independently or in any combination their summary in the claims or their relationship, and regardless of their wording or representation in the description or in the drawing.
Ausführungsbeispiele der ErfindungEmbodiments of the invention
Die einzige Figur der Zeichnung zeigt eine schematische Darstellung eines Ausführungsbeispiels einer erfindungsgemäßen Brennkraftmaschine .The only figure of the drawing shows a schematic representation of an embodiment of an internal combustion engine according to the invention.
In der Figur ist eine Brennkraftmaschine 1 eines Kraftfahrzeugs dargestellt, bei der ein Kolben 2 in einem Zylinder 3 hin- und herbewegbar ist. Der Zylinder 3 ist mit einem Brennraum 4 versehen, der unter anderem durch den Kolben 2, ein Einlaßventil 5 und ein Auslaßventil 6 begrenzt ist. Mit dem Einlaßventil 5 ist ein Ansaugrohr 7 und mit dem Auslaßventil 6 ist ein Abgasrohr 8 gekoppelt.The figure shows an internal combustion engine 1 of a motor vehicle, in which a piston 2 can be moved back and forth in a cylinder 3. The cylinder 3 is provided with a combustion chamber 4 which is delimited inter alia by the piston 2, an inlet valve 5 and an outlet valve 6. An intake pipe 7 is coupled to the inlet valve 5 and an exhaust pipe 8 is coupled to the exhaust valve 6.
Im Bereich des Einlaßventils 5 und des Auslaßventils 6 ragen ein Einspritzventil 9 und eine Zündkerze 10 in denIn the area of the inlet valve 5 and the outlet valve 6, an injection valve 9 and a spark plug 10 protrude into the
Brennraum 4. Über das Einspritzventil 9 kann Kraftstoff in den Brennraum 4 eingespritzt werden. Mit der Zündkerze 10 kann der Kraftstoff in dem Brennraum 4 entzündet werden.Combustion chamber 4. Fuel can be injected into combustion chamber 4 via injection valve 9. The fuel in the combustion chamber 4 can be ignited with the spark plug 10.
In dem Ansaugrohr 7 ist eine drehbare Drosselklappe 11 untergebracht, über die dem Ansaugrohr 7 Luft zuführbar ist. Die Menge der zugeführten Luft ist abhängig von der Winkelstellung der Drosselklappe 11. In dem Abgasrohr 8 ist ein Katalysator 12 untergebracht, der der Reinigung der durch die Verbrennung des Kraftstoffs entstehenden Abgase dient .In the intake pipe 7, a rotatable throttle valve 11 is accommodated, via which air can be fed to the intake pipe 7. The amount of air supplied is dependent on the angular position of the throttle valve 11. A catalytic converter 12 is accommodated in the exhaust pipe 8 and serves to clean the exhaust gases resulting from the combustion of the fuel.
Bei dem Katalysator 12 handelt es sich um einen Speicherkatalysator 12', der mit einem Dreiwegekatalysator 12'' kombiniert ist. Der Katalysator 12 ist damit unter anderem dazu vorgesehen, Stickoxide (NOx) zwischenzuspeichern . In dem Katalysator 12 ist ein Temperatursensor 13 vorgesehen. Alternativ oder zusätzlich ist in dem Abgasrohr unmittelbar nach dem Katalysator 12 ein Temperatursensor 14 vorgesehen.The catalytic converter 12 is a storage catalytic converter 12 ′ which is combined with a three-way catalytic converter 12 ″. The catalytic converter 12 is thus intended, inter alia, to remove nitrogen oxides (NOx) caching. A temperature sensor 13 is provided in the catalytic converter 12. Alternatively or additionally, a temperature sensor 14 is provided in the exhaust pipe immediately after the catalytic converter 12.
Ein Steuergerät 18 ist von Eingangssignalen 19 beaufschlagt, die mittels Sensoren gemessene Betriebsgrößen der Brennkraftmaschine 1 darstellen. Das Steuergerät 18 erzeugt Ausgangssignale 20, mit denen über Aktoren bzw. Steller das Verhalten der Brennkraftmaschine 1 beeinflußt werden kann. Unter anderem ist das Steuergerät 18 dazu vorgesehen, die Betriebsgrößen der Brennkraftmaschine 1 zu steuern und/oder zu regeln. Zu diesem Zweck ist das Steuergerät 18 mit einem Mikroprozessor versehen, der in einem Speichermedium, insbesondere in einem Flash-Memory ein Programm abgespeichert hat, das dazu geeignet ist, die genannte Steuerung und/oder Regelung durchzuführen.A control device 18 is acted upon by input signals 19, which represent operating variables of the internal combustion engine 1 measured by sensors. The control unit 18 generates output signals 20 with which the behavior of the internal combustion engine 1 can be influenced via actuators or actuators. Among other things, the control unit 18 is provided to control and / or regulate the operating variables of the internal combustion engine 1. For this purpose, the control unit 18 is provided with a microprocessor, which has stored a program in a storage medium, in particular in a flash memory, which is suitable for carrying out the control and / or regulation mentioned.
In einer ersten Betriebsart, einem sogenannten Homogenbetrieb der Brennkraftmaschine 1, wird dieIn a first operating mode, a so-called homogeneous operation of the internal combustion engine 1, the
Drosselklappe 11 in Abhängigkeit von dem erwünschten Drehmoment teilweise geöffnet bzw. geschlossen. Der Kraftstoff wird von dem Einspritzventil 9 während einer durch den Kolben 2 hervorgerufenen Ansaugphase in den Brennraum 4 eingespritzt. Durch die gleichzeitig über dieThrottle valve 11 partially opened or closed depending on the desired torque. The fuel is injected into the combustion chamber 4 by the injection valve 9 during an induction phase caused by the piston 2. By at the same time over the
Drosselklappe 11 angesaugte Luft wird der eingespritzte Kraftstoff verwirbelt und damit in dem Brennraum 4 im wesentlichen gleichmäßig verteilt. Danach wird das Kraftstoff/Luft-Gemisch während der Verdichtungsphase verdichtet, um dann von der Zündkerze 10 entzündet zu werden. Durch die Ausdehnung des entzündeten Kraftstoffs wird der Kolben 2 angetrieben. Das entstehende Drehmoment hängt im Homogenbetrieb unter anderem von der Stellung der Drosselklappe 11 ab. Im Hinblick auf eine geringe Schadstoffentwicklung wird das Kraftstoff/Luft-Gemisch möglichst auf La bda gleich Eins eingestellt. In einer zweiten Betriebsart, einem sogenannten Schichtbetrieb der Brennkraftmaschine 1, wird die Drosselklappe 11 weit geöffnet. Der Kraftstoff wird von dem Einspritzventil 9 während einer durch den Kolben 2 hervorgerufenen Verdichtungsphase in den Brennraum 4 eingespritzt, und zwar örtlich in die unmittelbare Umgebung der Zündkerze 10 sowie zeitlich in geeignetem Abstand vor dem Zündzeitpunkt. Dann wird mit Hilfe der Zündkerze 10 der Kraftstoff entzündet, so daß der Kolben 2 in der nunmehr folgenden Arbeitsphase durch die Ausdehnung des entzündeten Kraftstoffs angetrieben wird. Das entstehende Drehmoment hängt im Schichtbetrieb weitgehend von der eingespritzten Kraftstoffmasse ab. Im wesentlichen ist der Schichtbetrieb für den Leerlaufbetrieb und den Teillastbetrieb der Brennkraftmaschine 1 vorgesehen.Throttle valve 11 sucked air, the injected fuel is swirled and thus distributed substantially evenly in the combustion chamber 4. The fuel / air mixture is then compressed during the compression phase in order to then be ignited by the spark plug 10. The piston 2 is driven by the expansion of the ignited fuel. The resulting torque depends, among other things, on the position of the throttle valve 11 in homogeneous operation. In view of a low pollutant development, the fuel / air mixture is set to La bda equal to one if possible. In a second operating mode, a so-called stratified operation of internal combustion engine 1, throttle valve 11 is opened wide. The fuel is injected from the injection valve 9 into the combustion chamber 4 during a compression phase caused by the piston 2, specifically locally in the immediate vicinity of the spark plug 10 and at a suitable time before the ignition point. Then the fuel is ignited with the aid of the spark plug 10, so that the piston 2 is driven in the now following working phase by the expansion of the ignited fuel. The resulting torque largely depends on the injected fuel mass in shift operation. The stratified operation is essentially provided for the idle operation and the partial load operation of the internal combustion engine 1.
Der Speicherkatalysator 12' des Katalysators 12 wird während des Schichtbetriebs mit Stickoxiden beladen. In einem nachfolgenden Homogenbetrieb wird der Speicherkatalysator 12' wieder entladen und die Stickoxiάe werden von dem Dreiwegekatalysator 12'' reduziert.The storage catalytic converter 12 ′ of the catalytic converter 12 is loaded with nitrogen oxides during the shift operation. In a subsequent homogeneous operation, the storage catalytic converter 12 'is discharged again and the nitrogen oxides are reduced by the three-way catalytic converter 12' '.
Der Speicherkatalysator 12' nimmt während seiner fortlaufenden Be- und Entladung mit Stickoxiden mit der Zeit Schwefel auf. Dies führt zu einer Einschränkung derThe storage catalytic converter 12 'absorbs sulfur over time during its continuous loading and unloading with nitrogen oxides. This leads to a limitation of
Speicherfähigkeit des Speicherkatalysators 12', die nachfolgend als Alterung bezeichnet wird.Storage capacity of the storage catalytic converter 12 ′, which is referred to below as aging.
Die Entladung des Speicherkatalysators 12' stellt eine exotherme Reaktion dar, bei der Wärme entsteht. Daraus resultiert eine Erhöhung der Temperatur der durch den Speicherkatalysator 12' hindurchströmenden Abgase. Diese Temperaturerhöhung wird von dem Temperatursensor 13 und/oder von dem Temperatursensor 14 gemessen. Gleichzeitig erfolgt durch die exotherme Reaktion auch eine Erhöhung der Temperatur des Speicherkatalysators 12' selbst, die alternativ oder zusätzlich von dem Temperatursensor 13 und gegebenenfalls auch von dem Temperatursensor 14 gemessen wird.The discharge of the storage catalytic converter 12 ′ represents an exothermic reaction in which heat is generated. This results in an increase in the temperature of the exhaust gases flowing through the storage catalytic converter 12 '. This temperature increase is measured by the temperature sensor 13 and / or by the temperature sensor 14. At the same time, the exothermic reaction also increases the temperature of the storage catalytic converter 12 'itself alternatively or additionally, the temperature sensor 13 and possibly also the temperature sensor 14 measure.
Aufgrund der Alterung des Speicherkatalysators 12' nimmt die Fähigkeit zur Speicherung von Stickoxiden in dem Speicherkatalysator 12' ab. Dies führt gleichzeitig zu einer Verminderung des Entladevorgangs aufgrund der geringeren Abspeicherung von Stickoxiden. Damit wird auch die Temperaturerhöhung aufgrund der aus dem Entladen resultierenden exothermen Reaktion geringer. Diese geringere Temperaturerhöhung wird wiederum von dem Temperatursensor 13 und/oder von dem Temperatursensor 14 gemessen .Due to the aging of the storage catalytic converter 12 ', the ability to store nitrogen oxides in the storage catalytic converter 12' decreases. At the same time, this leads to a reduction in the discharge process due to the lower storage of nitrogen oxides. The temperature rise due to the exothermic reaction resulting from the discharge is thus also lower. This lower temperature increase is in turn measured by the temperature sensor 13 and / or by the temperature sensor 14.
Von dem Steuergerät 18 wird die aktuell gemessene Temperaturerhöhung während des Betriebs derThe currently measured temperature increase during the operation of the
Brennkraftmaschine 1 überwacht. Dies kann dadurch erfolgen, daß die aktuelle Temperaturerhöhung mit einer Temperaturerhöhung verglichen wird, die bei einem neuenInternal combustion engine 1 monitors. This can be done by comparing the current temperature increase with a temperature increase that occurs with a new one
Speicherkatalysator 12' bzw. einem neuen Katalysator 12 gemessen worden ist. Alternativ oder zusätzlich kann dies dadurch erfolgen, daß die aktuelle Temperaturerhöhung mit einer modellierten Temperaturerhöhung verglichen wird. Ebenfalls alternativ oder zusätzlich kann ein Vergleich mit einer Temperaturerhöhung eines sogenannten Grenzkatalysators erfolgen. Bei dem Grenzkatalysator handelt es sich dabei um einen Katalysator, der gerade noch einsatzfähig ist bzw. gerade defekt geworden ist.Storage catalyst 12 'or a new catalyst 12 has been measured. Alternatively or additionally, this can be done by comparing the current temperature increase with a modeled temperature increase. Alternatively or additionally, a comparison can also be made with an increase in temperature of a so-called limit catalyst. The limit catalytic converter is a catalytic converter that is just still operational or has just become defective.
Bei einem Vergleich mit einem neuen Speicherkatalysator wird die Differenz der aktuell gemessenen Temperaturerhöhung zu der Temperaturerhöhung des neuen Speicherkatalysators immer größer. Überschreitet die Differenz der aktuellen Temperaturerhöhung zu derWhen comparing with a new storage catalytic converter, the difference between the currently measured temperature increase and the temperature increase of the new storage catalytic converter becomes ever greater. Exceeds the difference between the current temperature rise and that
Temperaturerhöhung des neuen Speicherkatalysators einen oberen Schwellwert, so wird von dem Steuergerät 18 darauf geschlossen, daß der Speicherkatalysator 12' des Katalysators 12 nunmehr eine Alterung erreicht hat, die im Hinblick auf eine ausreichende Abgasreinigung nicht mehr hinnehmbar ist. Das Steuergerät 18 erzeugt daraufhin z.B. ein Signal, das von dem Fahrer oder von einer Werkstatt erkannt werden kann, und das den erforderlichen Austausch des Speicherkatalysators 12' bzw. des gesamten Katalysators 12 anzeigt.Temperature increase of the new storage catalytic converter upper threshold value, the control unit 18 concludes that the storage catalytic converter 12 'of the catalytic converter 12 has now reached an age which is no longer acceptable in view of adequate exhaust gas purification. The control unit 18 then generates, for example, a signal that can be recognized by the driver or by a workshop and that indicates the required replacement of the storage catalytic converter 12 ′ or the entire catalytic converter 12.
Bei der Verwendung der modellierten Temperaturerhöhung wird die Differenz zu der aktuellen Temperaturerhöhung ebenfalls immer größer, so daß die Differenz mit einem zugehörigen oberen Schwellwert verglichen wird, bei dessen Erreichen der Speicherkatalysator 12' ausgetauscht werden muß.When using the modeled temperature increase, the difference to the current temperature increase also becomes larger and larger, so that the difference is compared with an associated upper threshold value, upon reaching which the storage catalytic converter 12 'must be replaced.
Bei der Verwendung eines Grenzkatalysators wird die Differenz zu der aktuellen Temperaturerhöhung immer kleiner, so daß die Differenz mit einem zugehörigen unteren Schwellwert verglichen wird, bei dessen Erreichen der Speicherkatalysator 12' ausgetauscht werden muß.When using a limit catalytic converter, the difference to the current temperature increase becomes smaller and smaller, so that the difference is compared with an associated lower threshold value, upon reaching which the storage catalytic converter 12 'must be replaced.
Alternativ oder zusätzlich können dem Vergleich die absoluten Temperaturen zugrunde gelegt werden.Alternatively or additionally, the comparison can be based on the absolute temperatures.
Die Temperaturerhöhung durch die exotherme Reaktion während der Entladung des Speicherkatalysators 12' ist gleichbedeutend mit einer Maximaltemperatur, die von dem Temperatursensor 13 und/oder dem Temperatursensor 14 gemessen wird. Diese Maximaltemperatur wird aufgrund der Alterung des Speicherkatalysators 12' mit der Zeit geringer. Unterschreitet die Maximaltemperatur einen unteren Schwellwert, so muß der Speicherkatalysator 12' ausgetauscht werden.The temperature increase due to the exothermic reaction during the discharge of the storage catalytic converter 12 ′ is synonymous with a maximum temperature that is measured by the temperature sensor 13 and / or the temperature sensor 14. This maximum temperature becomes lower over time due to the aging of the storage catalytic converter 12 '. If the maximum temperature falls below a lower threshold value, the storage catalytic converter 12 'must be replaced.
Das vorstehende Verfahren kann fortlaufend während des Betriebs der Brennkraftmaschine 1 eingesetzt werden. Alternativ oder zusätzlich ist es möglich, das Verfahren speziell zur Diagnose der Speicherfähigkeit des Speicherkatalysators 12' einzusetzen. The above procedure may continue throughout the Operation of the internal combustion engine 1 are used. Alternatively or additionally, it is possible to use the method specifically for diagnosing the storage capacity of the storage catalytic converter 12 '.

Claims

Ansprüche Expectations
1. Verfahren zum Betreiben eines Speicherkatalysators (12') einer Brennkraftmaschine (1) insbesondere eines Kraftfahrzeugs, bei dem der Speicherkatalysator (12') mit Stickoxiden be- und entladen wird, dadurch gekennzeichnet, daß die Temperatur des durch den Speicherkatalysator (12') strömenden Abgases und/oder die Temperatur des1. A method for operating a storage catalytic converter (12 ') of an internal combustion engine (1), in particular a motor vehicle, in which the storage catalytic converter (12') is loaded and unloaded with nitrogen oxides, characterized in that the temperature of the storage catalytic converter (12 ') flowing exhaust gas and / or the temperature of the
Speicherkatalysators (12') gemessen und mit einem Schwellwert verglichen wird.Storage catalyst (12 ') is measured and compared with a threshold.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß eine Temperaturerhöhung gemessen und mit einer2. The method according to claim 1, characterized in that a temperature increase is measured and with a
Temperaturerhöhung verglichen wird, die bei einem neuen Speicherkatalysator (12') gemessen worden ist, und daß die Differenz mit einem oberen Grenzwert verglichen wird.Temperature increase is compared, which has been measured in a new storage catalytic converter (12 '), and that the difference is compared with an upper limit value.
3. Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß eine Temperaturerhöhung gemessen und mit einer modellierten Temperaturerhöhung verglichen wird, und daß die Differenz mit einem oberen Grenzwert verglichen wird.3. The method according to any one of claims 1 or 2, characterized in that a temperature increase is measured and compared with a modeled temperature increase, and that the difference is compared with an upper limit.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß eine Temperaturerhöhung gemessen und mit einer Temperaturerhöhung verglichen wird, die bei einem Grenzkatalysator gemessen worden ist, und daß die Differenz mit einem unteren Grenzwert verglichen wird. 4. The method according to any one of claims 1 to 3, characterized in that an increase in temperature is measured and compared with an increase in temperature which has been measured in a limit catalytic converter, and in that the difference is compared with a lower limit value.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß eine Maximaltemperatur gemessen und mit einem unteren Schwellwert verglichen wird.5. The method according to any one of claims 1 to 4, characterized in that a maximum temperature is measured and compared with a lower threshold.
6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Temperatur in und/oder unmittelbar nach dem Speicherkatalysator (12') gemessen wird.6. The method according to any one of claims 1 to 5, characterized in that the temperature in and / or immediately after the storage catalyst (12 ') is measured.
7. Verfahren nach einem der Ansprüche 1 bis 6, gekennzeichnet durch die Verwendung zur Diagnose der Speicherfähigkeit des Speicherkatalysators (12') .7. The method according to any one of claims 1 to 6, characterized by the use for diagnosing the storage capacity of the storage catalytic converter (12 ').
8. Steuerelelement, insbesondere Flash-Memory, für ein Steuergerät (18) einer Brennkraf maschine (1) insbesondere eines Kraftfahrzeugs, auf dem ein Programm abgespeichert ist, das auf einem Rechengerät, insbesondere auf einem Mikroprozessor, ablauffähig und zur Ausführung eines Verfahrens nach einem der Ansprüche 1 bis 7 geeignet ist.8. Control element, in particular flash memory, for a control device (18) of an internal combustion engine (1), in particular a motor vehicle, on which a program is stored which can be run on a computing device, in particular on a microprocessor, and for executing a method according to a of claims 1 to 7 is suitable.
9. Steuergerät (18) für eine Brennkraftmaschine (1) insbesondere eines Kraftfahrzeugs, wobei die Brennkraftmaschine (1) einen Speicherkatalysator (12') aufweist, der mit Stickoxiden be- und entladen werden kann, dadurch gekennzeichnet, daß ein Temperatursenor (13, 14) zur Messung der Temperatur des durch den9. Control device (18) for an internal combustion engine (1), in particular of a motor vehicle, the internal combustion engine (1) having a storage catalytic converter (12 ') which can be loaded and unloaded with nitrogen oxides, characterized in that a temperature sensor (13, 14 ) to measure the temperature of the
Speicherkatalysator (12') strömenden Abgases und/oder der Temperatur des Speicherkatalysators (12') vorgesehen ist, und daß durch das Steuergerät (18) die gemessene Temperatur mit einem Schwellwert vergleichbar ist.Storage catalytic converter (12 ') flowing exhaust gas and / or the temperature of the storage catalytic converter (12') is provided, and that the measured temperature is comparable to a threshold value by the control unit (18).
10. 3rennkraftmaschine (1) insbesondere für ein Kraftfahrzeug mit einem Speicherkatalysator (12'), der mit Stickoxiden be- und entladen werden kann, und mit einem Steuergerät (18), dadurch gekennzeichnet, daß ein Temperatursensor (13, 14) zur Messung der Temperatur des durch den Speicherkatalysator (12') strömenden Abgases und/oder der Temperatur des Speicherkatalysators (12') vorgesehen ist, und daß durch das Steuergerät (18) die gemessene Temperatur mit einem Schwellwert vergleichbar ist. 10. 3 internal combustion engine (1) in particular for a motor vehicle with a storage catalytic converter (12 ') which can be loaded and unloaded with nitrogen oxides, and with a control unit (18), characterized in that a temperature sensor (13, 14) for measuring the Temperature of the exhaust gas flowing through the storage catalytic converter (12 ') and / or the temperature of the storage catalytic converter (12 ') is provided, and that the measured temperature is comparable to a threshold value by the control device (18).
EP00991535A 1999-12-31 2000-12-20 Method for operating a storage catalyst of an internal combustion engine Ceased EP1159518A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19963925 1999-12-31
DE19963925A DE19963925A1 (en) 1999-12-31 1999-12-31 Method for operating a storage catalytic converter of an internal combustion engine
PCT/DE2000/004549 WO2001049994A1 (en) 1999-12-31 2000-12-20 Method for operating a storage catalyst of an internal combustion engine

Publications (1)

Publication Number Publication Date
EP1159518A1 true EP1159518A1 (en) 2001-12-05

Family

ID=7935091

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00991535A Ceased EP1159518A1 (en) 1999-12-31 2000-12-20 Method for operating a storage catalyst of an internal combustion engine

Country Status (4)

Country Link
EP (1) EP1159518A1 (en)
JP (1) JP2003519324A (en)
DE (1) DE19963925A1 (en)
WO (1) WO2001049994A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10137134B4 (en) * 2001-07-30 2004-09-02 Robert Bosch Gmbh Method and control device for operating an internal combustion engine, in particular a motor vehicle
DE10207293B4 (en) * 2002-02-21 2005-02-24 Siemens Ag Method for controlling an emission control system and corresponding emission control system
DE10257172B4 (en) * 2002-12-03 2011-06-22 Volkswagen AG, 38440 Method for operating an internal combustion engine with a flexible adaptation of the component protection design

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4211092A1 (en) * 1992-04-03 1993-10-07 Bosch Gmbh Robert Method and device for assessing the functionality of a catalytic converter
JP3603422B2 (en) * 1995-10-23 2004-12-22 日産自動車株式会社 Engine catalyst temperature estimation device and catalyst diagnosis device
DE19706608A1 (en) * 1997-02-20 1998-08-27 Ford Global Tech Inc Process for the desulfurization of a nitrogen oxide trap in the exhaust system of an internal combustion engine
DE19736967A1 (en) * 1997-08-25 1999-03-04 Emitec Emissionstechnologie Method and arrangement for monitoring NOx reservoir in combustion engine esp diesel engine exhaust gas output line
US5998210A (en) * 1997-10-01 1999-12-07 Ford Global Technologies, Inc. Method and apparatus for aging a catalyst
JP4346118B2 (en) * 1997-10-08 2009-10-21 株式会社デンソー Catalyst temperature control device for internal combustion engine
DE19753718C1 (en) * 1997-12-04 1999-07-08 Daimler Chrysler Ag Method for operating a diesel engine
JPH11229859A (en) * 1998-02-12 1999-08-24 Mitsubishi Motors Corp Internal combustion engine
DE19817650C2 (en) * 1998-04-21 2002-05-08 Ford Werke Ag Method and device for regulating the temperature of an exhaust gas treatment arrangement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0149994A1 *

Also Published As

Publication number Publication date
DE19963925A1 (en) 2001-07-12
JP2003519324A (en) 2003-06-17
WO2001049994A1 (en) 2001-07-12

Similar Documents

Publication Publication Date Title
EP1247007B1 (en) Method of diagnosing a catalyst of an internal combustion engine
EP3475543B1 (en) Method and device for the exhaust gas aftertreatment of an internal combustion engine
EP1307640B1 (en) Method for operating a nitrogen oxide (nox) storage catalyst
EP1307639B1 (en) Method and controller for operating a nitrogen oxide (nox) storage catalyst
EP1193376B1 (en) Control of an NOx-storage catalyst
EP1305507B1 (en) Method for operating a catalyst
WO2002014658A1 (en) Method and control device for determining the state of a nitrogen oxide (nox) storage catalyst
EP1230471B1 (en) Method for operating an accumulator-type catalytic converter of an internal combustion engine
EP1159517B1 (en) Method for operating the catalyst of an internal combustion engine
EP1247006B1 (en) Method for operating a storage catalyst of an internal combustion engine
WO2001049994A1 (en) Method for operating a storage catalyst of an internal combustion engine
EP1247008A1 (en) Method for operating a three-way catalyst of an internal combustion engine
WO2001033059A1 (en) Method for operating an internal combustion engine
WO2001009490A1 (en) Method for the operation of an internal combustion engine
EP1159519B1 (en) Method for operating a three-way catalyst of an internal combustion engine
DE10137134B4 (en) Method and control device for operating an internal combustion engine, in particular a motor vehicle
WO2001002710A1 (en) Method for operating an internal combustion engine
WO2004022953A1 (en) Method for controlling the lean operation of an internal combustion engine, especially an internal combustion engine of a motor vehicle, provided with a nox storage catalyst
DE19859176A1 (en) Testing lean burn engine exhaust lambda sensor is accomplished by evaluating its responsiveness when inlet manifold mixture is suddenly enriched as part of rich regeneration cycle for nitrogen oxide catalyst
WO2001050002A2 (en) Method for operating an internal combustion engine in particular in a motor vehicle
WO2004022934A1 (en) Method for determining the degree of ageing of an nox -storage catalyst of an internal combustion engine, especially in a motor vehicle

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

17P Request for examination filed

Effective date: 20020114

RBV Designated contracting states (corrected)

Designated state(s): DE FR IT SE

17Q First examination report despatched

Effective date: 20040517

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 20050617