EP1227234A2 - Method and apparatus for operating a NOx-sensor located in the exhaust line of an internal combustion engine - Google Patents

Method and apparatus for operating a NOx-sensor located in the exhaust line of an internal combustion engine Download PDF

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Publication number
EP1227234A2
EP1227234A2 EP01128691A EP01128691A EP1227234A2 EP 1227234 A2 EP1227234 A2 EP 1227234A2 EP 01128691 A EP01128691 A EP 01128691A EP 01128691 A EP01128691 A EP 01128691A EP 1227234 A2 EP1227234 A2 EP 1227234A2
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EP
European Patent Office
Prior art keywords
nox
internal combustion
operating state
combustion engine
nox sensor
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EP01128691A
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German (de)
French (fr)
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EP1227234A3 (en
EP1227234B1 (en
Inventor
Gabriele Buch
Stefan Detterbeck
Hanns-Christian Hasenclever
Hans Dr. Höninger
Peter Müller
Stephan Ramatschi
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • 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
    • F02D41/14—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
    • F02D41/146—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 an NOx content or concentration
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2441—Methods of calibrating or learning characterised by the learning conditions
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2474—Characteristics of sensors

Definitions

  • the invention relates to a method and an apparatus for Operating an exhaust gas sensor and in particular a Method and its device for operating NOx sensors, which are arranged in the exhaust gas path of an internal combustion engine are.
  • NOx catalysts are used to filter the high nitrogen oxide content of internal combustion engines with a lean air / fuel mixture.
  • the so-called air ratio ⁇ provides the indication of the air / fuel ratio.
  • NOx storage catalysts are known, which are operated alternately in two operating modes.
  • the so-called sorption phase NOx contained in the exhaust gas of the internal combustion engine by the NOx storage catalytic converter is stored under oxidizing exhaust gas conditions, that is to say during engine lean operation.
  • a regeneration phase or desorption phase is initiated at certain times, in which the air ratio of the air / fuel mixture supplied to the engine and thus also the air ratio of the exhaust gas leaving the engine are briefly reduced to values below 1 becomes. This is also called enrichment of the air / fuel mixture or the exhaust gas.
  • this brief operating phase there are reducing conditions in the exhaust gas before entering the storage catalytic converter. The stored nitrogen oxides are then released under the reducing conditions during the enrichment phase.
  • NOx-sensitive sensor or sensor in the exhaust gas path arranged.
  • the output signal of this sensor then becomes Loading degree determination of the catalyst and to determine the The beginning and end of the regeneration phase.
  • the NOx sensors known to date show in new condition a satisfactory measurement accuracy, but they are not resistant to aging.
  • the NOx sensor in the exhaust gas path changes its Measurement characteristic due to contamination various pollutants or deposits of Combustion residues.
  • the Zero point of the measurement curve considerably with aging.
  • a realistic shift of 10% corresponds approximately containing more than 50 ppm NOx.
  • the accuracy in the range of However, zero point is for the serial use of NOx sensors very important because of an arrangement after the catalyst predominantly small NOx concentrations have to be measured ( ⁇ 50 ppm). A slight inaccuracy of the measured values leads consequently to a large measurement uncertainty.
  • DE-198 59 580 A1 proposes that Working temperature of the sensor element of the NOx sensor slowly over the life of the sensor element increase. Through this temperature adjustment, the resistance of the sensor element is reduced because the ion conductivity with the temperature increases. By increasing the, Working temperature of the sensor element is reached that the maximum applied voltage to a measuring electrode Value does not exceed a decomposition of NOx at this Electrode to prevent which decomposed NOx molecules then no longer available on the actual measuring electrode stood. Such an avoidance of measurement errors is, however very complex, because an electric heating device for heating of the sensor element is required.
  • the invention is also a device for determining of the NOx content in the exhaust gas path of an internal combustion engine provided with a NOx sensor of which the NOx content in Exhaust gas path is detected and an associated NOx sensor signal value is generated, and with a control device that with the NOx sensor is connected, the control device such is designed that a predetermined operating state of the internal combustion engine with a known NOx content in the exhaust gas is adjustable, with at least one NOx sensor signal value at the predetermined engine operating state of the Internal combustion engine from the NOx sensor that is supplied by the at least one supplied NOx sensor signal value a signal value corresponding to the known NOx content comparable and the difference between the measured NOx content and the known NOx content can be determined that of you from the at least one determined difference Correction value can be determined, and that of that from the NOx sensor NOx sensor signal values obtained while determining respective NOx content signal values corresponding to the respective NOx contents in the exhaust gas, by means of the correction value are correctable.
  • the method is preferably in an engine operating state at which the NOx concentration in the exhaust gas reaches its minimum reached, i.e. Is zero.
  • the slope of the logarithmic NOx sensor values towards zero and forms a maximum Limit At very high NOx values, the slope of the logarithmic NOx sensor values towards zero and forms a maximum Limit.
  • the method can therefore preferably also in the maximum limit of the NOx measurement curve must be implemented, i.e. in certain engine operating conditions in certain locations Exhaust system with an extremely high NOx concentration occurs.
  • the Correction value which is used to correct that from the NOx sensor measured signal values is used, from a plurality of Differences between the measured NOx content and one calculated corresponding known NOx content, the Differences at different operating points of the Internal combustion engine can be determined.
  • the arrangement of the NOx sensor in front of the pre-catalyst is suitable for the above engine operating conditions 1, 3, 4 and 7 to 9.
  • the arrangement of the NOx sensor in front of the NOx storage catalytic converter, in particular between the pre-catalytic converter and the NOx storage catalytic converter, is suitable for the above engine operating states 1 to 5 and 7 to 9.
  • the arrangement of the NOx sensor after the NOx storage catalytic converter is suitable for all of the above engine operating states 1 to 9.
  • the NOx measurement curve can be at certain time intervals and upon the occurrence of the appropriate certain described above Engine operating states via the engine control or Computing device can be calibrated and thus compared.
  • the internal combustion engine 1 can either be an Otto or an Be a diesel engine and it passes its engine operating state at least one sensor to the engine control or Computer unit 5 further.
  • a pre-catalyst 2 In the exhaust gas path after Internal combustion engine 1 is a pre-catalyst 2 and behind it is a NOx storage catalytic converter 3.
  • a NOx sensor 4A, 4B, 4C can be in place between the engine 1 and the Pre-catalyst 2 or at the location between the pre-catalyst 2 and the NOx storage catalyst 3 or at the location after NOx storage catalyst (3) must be positioned. But it can also several NOx sensors 4A-4C positioned at several locations his.
  • the NOx sensor 4 gives its measured value to the Motor control or computer unit 5 further.
  • the air mass sensor 6 is used for engine control.
  • the internal combustion engine 1 is operated by the engine control 5 Dependency of the driving commands of the vehicle operator and in Dependency of the required engine operating states of the preliminary or NOx catalyst 3 controlled and regulated.
  • the NOx storage catalytic converter 3 stores the NOx emissions through adsorption in a storage phase and reduces this in the Regeneration phase so that the NOx emissions are minimized become.
  • the NOx sensor 4C after the NOx storage catalyst 3 shows the when a NOx sensor limit value is exceeded
  • Engine control 5 indicates that the storage phase of the NOx catalyst 3 ended and it is saturated.
  • the Engine control 5 has stored a NOx measurement curve. she controls the calibration of the NOx sensor 4 as described above Method.
  • the engine control 5 represents a control device which determine a NOx measurement curve from known NOx contents Operating states, which NOx measurement curve the fully functional NOx sensors in these particular Operating states would have to record. To worsen the Balancing the function of the NOx sensor controls the Motor control 5 on the motor in the manner described above a predetermined operating state for which they are NOx measurement curve has saved and compares one from the NOx sensor NOx measured value actually recorded in this operating state or more measured NOx values with the pre-stored NOx values. From the difference between actually measured NOx values and the pre-stored The engine control 5 determines a correction value for values Correction of the NOx contents detected by the NOx sensor. This The correction value is used to adjust the measured values of the NOx sensor used until a new correction value is given above described procedure is determined. An investigation a respective correction value is preferred at intervals of xx sec (please insert preferred time period).
  • the previously known NOx sensors can thus be used in series production. There are no additional costs for increasing the quality with regard to the aging stability of the NOx sensors.
  • the use of NOx sensors allows the advantages of fuel reduction and the fulfillment of strict emission limits to be realized.
  • the method and the device require no additional installation space and therefore no significant additional weight.
  • the invention requires only low additional costs, since all essential components for the regulation of the NOx catalytic converter and the diagnosis are already available.

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

Abstract

The method involves coordinating measurement values of a nitrogen oxides (NOx) sensor in an exhaust system with earlier signals values for the same NOx content. This involves setting a defined engine operating state, detecting at least one NOx sensor value, comparing this with values for the known NOx content, determining the difference, determining a correction value and correcting the measured value with the correction value. An Independent claim is included for an arrangement for determining the nitrogen oxides content in the exhaust gas system of an internal combustion engine.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Betreiben eines Abgas-Messaufnehmers und insbesondere ein Verfahren und dessen Vorrichtung zum Betreiben von NOx-Sensoren, die im Abgasweg eines Verbrennungsmotors angeordnet sind.The invention relates to a method and an apparatus for Operating an exhaust gas sensor and in particular a Method and its device for operating NOx sensors, which are arranged in the exhaust gas path of an internal combustion engine are.

In Abgas-Nachbehandlungssystemen von Verbrennungsmotoren werden NOx-Katalysatoren eingesetzt, die den hohen Stickoxidanteil von Verbrennungsmotoren mit einem mageren Luft-/Kraftstoffgemisch filtern sollen. Die sog. Luftzahl λ liefert hierzu die Angabe des Luft-/Kraftstoff-Verhältnisses. Bei der Luftzahl λ handelt es sich um das auf stöchiometrische Bedingungen normierte Luft/Kraftstoffverhältnis, das angibt, wieviel Kilogramm Luft für die vollständige Verbrennung von einem Kilogramm Kraftstoff benötigt werden. Stöchiometrische Bedingungen dieses Luft-Kraftstoff-Verhältnisses liegen somit für λ=1 vor.
Im Stand der Technik sind NOx-Speicher-Katalysatoren bekannt, die abwechselnd in zwei Betriebsmodi betrieben werden. In einem ersten Betriebsmodus, der sog. Sorptionsphase wird von dem NOx-Speicher-Katalysator im Abgas der Brennkraftmaschine enthaltenes NOx unter oxidierenden Abgasbedingungen, d.h. im Magerbetrieb des Motors, gespeichert. Da die Speicherkapazität eines Speicherkatalysators jedoch begrenzt ist, wird zu bestimmten Zeiten eine Regenerationsphase oder Desorptionsphase eingeleitet, in der die Luftzahl des dem Motor zugeführten Luft/Kraftstoff-Gemisches und damit auch die Luftzahl des den Motor verlassenden Abgases für kurze Zeit auf Werte unter 1 abgesenkt wird. Dies wird auch als Anfettung des Luft/Kraftstoff-Gemisches oder des Abgases bezeichnet. Während dieser kurzen Betriebsphase liegen im Abgas vor Eintritt in den Speicherkatalysator reduzierende Bedingungen vor. Unter den reduzierenden Bedingungen während der Anfettungsphase werden die gespeicherten Stickoxide dann freigesetzt.In exhaust aftertreatment systems of internal combustion engines, NOx catalysts are used to filter the high nitrogen oxide content of internal combustion engines with a lean air / fuel mixture. The so-called air ratio λ provides the indication of the air / fuel ratio. The air ratio λ is the air / fuel ratio standardized to stoichiometric conditions, which indicates how many kilograms of air are required for the complete combustion of one kilogram of fuel. Stoichiometric conditions of this air-fuel ratio are therefore available for λ = 1.
In the prior art, NOx storage catalysts are known, which are operated alternately in two operating modes. In a first operating mode, the so-called sorption phase, NOx contained in the exhaust gas of the internal combustion engine by the NOx storage catalytic converter is stored under oxidizing exhaust gas conditions, that is to say during engine lean operation. However, since the storage capacity of a storage catalytic converter is limited, a regeneration phase or desorption phase is initiated at certain times, in which the air ratio of the air / fuel mixture supplied to the engine and thus also the air ratio of the exhaust gas leaving the engine are briefly reduced to values below 1 becomes. This is also called enrichment of the air / fuel mixture or the exhaust gas. During this brief operating phase, there are reducing conditions in the exhaust gas before entering the storage catalytic converter. The stored nitrogen oxides are then released under the reducing conditions during the enrichment phase.

Zur Steuerung des Betriebes derartiger NOx-Katalysatoren wird ein NOx-sensitiver Messaufnehmer, bzw. Sensor im Abgasweg angeordnet. Das Ausgangssignal dieses Sensors wird dann zur Beladungsgradermittlung des Katalysators und zur Bestimmung des Beginns und des Endes der Regenerationsphase herangezogen.To control the operation of such NOx catalysts a NOx-sensitive sensor or sensor in the exhaust gas path arranged. The output signal of this sensor then becomes Loading degree determination of the catalyst and to determine the The beginning and end of the regeneration phase.

Die bis heute bekannten NOx-Sensoren zeigen zwar im Neuzustand eine befriedigende Messgenauigkeit, sie sind jedoch nicht alterungsstabil. Der NOx-Sensor im Abgasweg verändert seine Messcharakteristik aufgrund von Verschmutzungen durch verschiedene Schadstoffe oder Ablagerungen der Verbrennungsrückstände. Insbesondere verschiebt sich der Nullpunkt der Messkurve bei der Alterung erheblich. Eine realistische Verschiebung von 10% entspricht dabei ungefähr einem Gehalt von über 50 ppm NOx. Überdies verändert sich die Steigung der Messkurve. Die Genauigkeit im Bereich des Nullpunkts ist jedoch für einen Serieneinsatz von NOx-Sensoren sehr wichtig, weil bei einer Anordnung nach dem Katalysator überwiegend kleine NOx-Konzentrationen gemessen werden müssen (< 50 ppm). Eine geringfügige Ungenauigkeit der Messwerte führt demzufolge zu einer großen Messunsicherheit.The NOx sensors known to date show in new condition a satisfactory measurement accuracy, but they are not resistant to aging. The NOx sensor in the exhaust gas path changes its Measurement characteristic due to contamination various pollutants or deposits of Combustion residues. In particular, the Zero point of the measurement curve considerably with aging. A realistic shift of 10% corresponds approximately containing more than 50 ppm NOx. Furthermore, the changes Slope of the measurement curve. The accuracy in the range of However, zero point is for the serial use of NOx sensors very important because of an arrangement after the catalyst predominantly small NOx concentrations have to be measured (<50 ppm). A slight inaccuracy of the measured values leads consequently to a large measurement uncertainty.

Die DE-198 59 580 A1 schlägt diesbezüglich vor, die Arbeitstemperatur des Sensorelements des NOx-Messaufnehmers langsam über die Lebensdauer des Sensorelements hinweg zu erhöhen. Durch diese Temperaturnachführung wird der Widerstand des Sensorelements erniedrigt, da die Ionenleitfähigkeit mit der Temperatur zunimmt. Durch eine Erhöhung der , Arbeitstemperatur des Sensorelements wird erreicht, dass die an einer Messelektrode angelegte Stellspannung einen maximalen Wert nicht überschreitet, um eine Zersetzung an NOx an dieser Elektrode zu verhindern, welche zersetzten NOx-Moleküle dann nicht mehr an der eigentlichen Messelektrode zur Verfügung stünden. Eine derartige Vermeidung von Messfehlern ist jedoch sehr aufwendig, da eine elektrische Heizeinrichtung zum Heizen des Sensorelements erforderlich ist.In this regard, DE-198 59 580 A1 proposes that Working temperature of the sensor element of the NOx sensor slowly over the life of the sensor element increase. Through this temperature adjustment, the resistance of the sensor element is reduced because the ion conductivity with the temperature increases. By increasing the, Working temperature of the sensor element is reached that the maximum applied voltage to a measuring electrode Value does not exceed a decomposition of NOx at this Electrode to prevent which decomposed NOx molecules then no longer available on the actual measuring electrode stood. Such an avoidance of measurement errors is, however very complex, because an electric heating device for heating of the sensor element is required.

Es ist somit eine Aufgabe der vorliegenden Erfindung, ein Verfahren und eine Vorrichtung zu schaffen, durch die eine funktionstüchtige Langzeitverwendung eines im Abgasweg eines Verbrennungsmotors angeordneten NOx-Sensors möglich ist, so dass trotz ungenügender Alterungsstabilität des NOx-Sensors der Serieneinsatz möglich ist.It is therefore an object of the present invention to provide a To create methods and an apparatus by which Functional long-term use of one in the exhaust gas path Combustion engine arranged NOx sensor is possible, so that despite insufficient aging stability of the NOx sensor Series use is possible.

Das erfindungsgemäße Verfahren weist hierzu folgende Schritte auf:

  • Einstellen eines Betriebszustands des Verbrennungsmotors mit bekanntem NOx-Gehalt im Abgas;
  • Erfassen mindestens eines NOx-Sensor-Signalwertes bei dem bestimmten Motorbetriebszustand des Verbrennungsmotors;
  • Vergleichen des mindestens einen mit dem NOx-Sensor gemessenen Signalwertes mit einem den bekannten NOx-Gehalt entsprechenden Signalwertes bei dem jeweiligen bekannten NOx-Gehalt;
  • Ermitteln der Differenz zwischen dem gemessenen NOx-Gehalt und dem bekannten NOx-Gehalt;
  • Bestimmen eines Korrekturwertes aus der mindestens einen ermittelten Differenz; und
  • Korrigieren der von dem NOx-Sensor gemessenen Signalwerte um den Korrekturwert.
The method according to the invention has the following steps:
  • Setting an operating state of the internal combustion engine with a known NOx content in the exhaust gas;
  • Detecting at least one NOx sensor signal value in the determined engine operating state of the internal combustion engine;
  • Comparing the at least one signal value measured with the NOx sensor with a signal value corresponding to the known NOx content at the respective known NOx content;
  • Determining the difference between the measured NOx content and the known NOx content;
  • Determining a correction value from the at least one determined difference; and
  • Correcting the signal values measured by the NOx sensor by the correction value.

Nach der Erfindung ist ferner eine Vorrichtung zum Ermitteln des NOx-Gehalts im Abgasweg eines Verbrennungsmotors vorgesehen, mit einem NOx-Sensor von dem der NOx-Gehalt im Abgasweg erfaßt wird und ein zugehöriger NOx-Sensor-Signalwert generiert wird, und mit einer Steuervorrichtung, die mit dem NOx-Sensor verbunden ist, wobei die Steuervorrichtung derart ausgebildet ist, dass von ihr ein vorbestimmter Betriebszustand des Verbrennungsmotors mit bekanntem NOx-Gehalt im Abgas einstellbar ist, wobei ihr mindestens ein NOx-Sensor-Signalwert bei dem vorbestimmten Motorbetriebszustand des Verbrennungsmotors von dem NOx-Sensor zugeführt wird, dass von ihr der mindestens eine zugeführte NOx-Sensor-Signalwert mit einem dem bekannten NOx-Gehalt entsprechenden Signalwert vergleichbar und die Differenz zwischen dem gemessenen NOx-Gehalt und dem bekannten NOx-Gehalt ermittelbar ist, dass von ihr aus der mindestens einen ermittelten Differenz ein Korrekturwert ermittelbar ist, und dass von ihr die vom NOx-Sensor erhaltenen NOx-Sensor-Signalwerte unter Ermittlung von jeweiligen NOx-Gehalt-Signalwerten, die den jeweiligen NOx-Gehalten im Abgas entsprechen, mittels des Korrekturwerts korrigierbar sind.According to the invention is also a device for determining of the NOx content in the exhaust gas path of an internal combustion engine provided with a NOx sensor of which the NOx content in Exhaust gas path is detected and an associated NOx sensor signal value is generated, and with a control device that with the NOx sensor is connected, the control device such is designed that a predetermined operating state of the internal combustion engine with a known NOx content in the exhaust gas is adjustable, with at least one NOx sensor signal value at the predetermined engine operating state of the Internal combustion engine from the NOx sensor that is supplied by the at least one supplied NOx sensor signal value a signal value corresponding to the known NOx content comparable and the difference between the measured NOx content and the known NOx content can be determined that of you from the at least one determined difference Correction value can be determined, and that of that from the NOx sensor NOx sensor signal values obtained while determining respective NOx content signal values corresponding to the respective NOx contents in the exhaust gas, by means of the correction value are correctable.

Vorteilhafte Weiterbildungen der Erfindung sind in den jeweiligen Unteransprüchen beschrieben.Advantageous developments of the invention are in the respective subclaims described.

Vorzugsweise wird das Verfahren in einem Motorbetriebszustand vollzogen, bei dem die NOx-Konzentration im Abgas ihr Minimum erreicht, d.h. Null ist.The method is preferably in an engine operating state at which the NOx concentration in the exhaust gas reaches its minimum reached, i.e. Is zero.

Bei sehr hohen NOx-Werten geht die Steigung der logarithmierten NOx-Sensorwerte gegen Null und bildet einen maximalen Grenzwert. Das Verfahren kann deshalb vorzugsweise auch beim maximalen Grenzwert der NOx-Messkurve vollzogen werden, d.h. bei bestimmten Motorbetriebszuständen an bestimmten Orten der Abgasanlage, bei denen eine extrem hohe NOx-Konzentration auftritt.At very high NOx values, the slope of the logarithmic NOx sensor values towards zero and forms a maximum Limit. The method can therefore preferably also in the maximum limit of the NOx measurement curve must be implemented, i.e. in certain engine operating conditions in certain locations Exhaust system with an extremely high NOx concentration occurs.

Minimal- bzw. Null-NOx-Konzentrationen treten im Abgas bei folgenden Betriebszuständen auf:

  • 1. in der Schubphase des Verbrennungsmotors;
  • 2. am Ende einer Regenerationsphase, bei der der Motor mit einem fetten, unterstöchiometrischen Luft-Kraftstoff-Verhältnis läuft; ,
  • 3. wenn der Verbrennungsmotor ausgeschaltet ist, wobei eine Sekundärluftpumpe die Abgasleitung spülen kann;
  • 4. unmittelbar nach dem Kaltstart, wobei der NOx-Sensor dann vor dem Motorstart vorgeheizt werden könnte;
  • 5. im Leerlauf des Verbrennungsmotors mit der Luftzahl λ=1 oder λ<1, wobei eine geringe NOx-Emission im NOx-Speicher-Katalysator vollständig umgesetzt werden kann;
  • 6. nach der Regeneration des NOx-Speicher-Katalysators im Niedrig- oder Teillastbetrieb mit einer Luftzahl von λ>1. Maximale NOx-Konzentrationen treten im Abgas bei folgenden Betriebszuständen des Verbrennungsmotors auf:
  • 7. beim Betrieb mit einer Luftzahl λ=1,1, wobei durch geeignete Zündwinkelverstellung und Rücknahme der Abgasrückführrate die NOx-Emission zusätzlich erhöht werden könnte;
  • 8. bei klopfender Verbrennung;
  • 9. beim Abstellen des Verbrennungsmotors, wenn die letzten Verbrennungen "fett" ablaufen, d.h. λ<1, und im NOx-Speicher-Katalysator adsorbiertes NOx desorbiert; aufgrund des kleinen Massenstroms bildet sich dann hinter dem NOx-Katalysator eine extrem hohe NOx-Konzentration.
    • Minimum or zero NOx concentrations occur in the exhaust gas under the following operating conditions:
  • 1. in the overrun phase of the internal combustion engine;
  • 2. At the end of a regeneration phase in which the engine runs with a rich, substoichiometric air-fuel ratio; .
  • 3. when the internal combustion engine is switched off, whereby a secondary air pump can purge the exhaust pipe;
  • 4. immediately after the cold start, the NOx sensor then being able to be preheated before the engine is started;
  • 5. when the internal combustion engine is idling with the air ratio λ = 1 or λ <1, it being possible for a low NOx emission to be completely implemented in the NOx storage catalytic converter;
  • 6. after regeneration of the NOx storage catalytic converter in low or partial load operation with an air ratio of λ> 1. Maximum NOx concentrations occur in the exhaust gas in the following operating states of the internal combustion engine:
  • 7. when operating with an air ratio λ = 1.1, whereby the NOx emission could be additionally increased by suitable adjustment of the ignition angle and reduction of the exhaust gas recirculation rate;
  • 8. knocking combustion;
  • 9. when the internal combustion engine is switched off, when the last burns are "rich", ie λ <1, and desorbs NOx adsorbed in the NOx storage catalytic converter; Due to the small mass flow, an extremely high NOx concentration then forms behind the NOx catalytic converter.

    • In einer bevorzugten Ausführungsform der Erfindung wird der Korrekturwert, welcher zum Korrigieren der von dem NOx-Sensor gemessenen Signalwerte verwendet wird, aus einer Mehrzahl an Differenzen zwischen dem gemessenen NOx-Gehalt und einem entsprechenden bekannten NOx-Gehalt berechnet, wobei die Differenzen jeweils an unterschiedlichen Betriebspunkten des Verbrennungsmotors ermittelt werden.In a preferred embodiment of the invention, the Correction value, which is used to correct that from the NOx sensor measured signal values is used, from a plurality of Differences between the measured NOx content and one calculated corresponding known NOx content, the Differences at different operating points of the Internal combustion engine can be determined.

    Der NOx-Sensor kann an drei Orten im Abgasweg des Verbrennungsmotors positioniert sein. D.h. entweder

  • a) nach dem Verbrennungsmotor und vor dem Vorkatalysator,
  • b) nach dem Vorkatalysator und vor dem NOx-Speicher-Katalysator, oder
  • c) nach dem NOx-Speicher-Katalysator.
    • The NOx sensor can be positioned at three locations in the exhaust gas path of the internal combustion engine. Ie either
  • a) after the internal combustion engine and before the pre-catalyst,
  • b) after the pre-catalyst and before the NOx storage catalyst, or
  • c) after the NOx storage catalyst.

    • Die Anordnung des NOx-Sensors vor dem Vorkatalysator eignet, sich für die obigen Motorbetriebszustände 1, 3, 4 und 7 bis 9.The arrangement of the NOx sensor in front of the pre-catalyst is suitable for the above engine operating conditions 1, 3, 4 and 7 to 9.

    Die Anordnung des NOx-Sensors vor dem NOx-Speicher-Katalysator, insbesondere zwischen Vorkatalysator und NOx-Speicher-Katalysator, eignet sich für die obigen Motorbetriebszustände 1 bis 5 und 7 bis 9.The arrangement of the NOx sensor in front of the NOx storage catalytic converter, in particular between the pre-catalytic converter and the NOx storage catalytic converter, is suitable for the above engine operating states 1 to 5 and 7 to 9.

    Die Anordnung des NOx-Sensors nach dem NOx-Speicher-Katalysator eignet sich für alle obigen Motorbetriebszustände 1 bis 9.The arrangement of the NOx sensor after the NOx storage catalytic converter is suitable for all of the above engine operating states 1 to 9.

    Die NOx-Messkurve kann in bestimmten zeitlichen Abständen und beim Auftreten der oben beschriebenen geeigneten bestimmten Motorbetriebszustände über die Motorsteuerungs- oder Rechnervorrichtung geeicht und damit abgeglichen werden.The NOx measurement curve can be at certain time intervals and upon the occurrence of the appropriate certain described above Engine operating states via the engine control or Computing device can be calibrated and thus compared.

    Im Folgenden wird eine bevorzugte Ausführungsform der vorliegenden Erfindung an Hand einer Zeichnung näher erläutert. In der Zeichnung zeigt

    • Fig. 1 eine schematische Darstellung mit den erforderlichen Komponenten und den Verbindungen für ein Verfahren und eine Vorrichtung zum Eichen eines NOx-Sensors.
    A preferred embodiment of the present invention is explained in more detail below with reference to a drawing. In the drawing shows
    • Fig. 1 is a schematic representation with the necessary components and the connections for a method and an apparatus for calibrating a NOx sensor.

    Der Verbrennungsmotor 1 kann entweder ein Otto- oder ein Dieselmotor sein, und er gibt seinen Motorbetriebszustand über mindestens einen Sensor an die Motorsteuerungs- oder Rechnereinheit 5 weiter. Im Abgasweg nach dem Verbrennungsmotor 1 befindet sich ein Vorkatalysator 2 und dahinter ein NOx-Speicher-Katalysator 3. Ein NOx-Sensor 4A, 4B, 4C kann an dem Ort zwischen dem Verbrennungsmotor 1 und dem Vorkatalysator 2 oder an dem Ort zwischen dem Vorkatalysator 2 und dem NOx-Speicher-Katalysator 3 oder an dem Ort nach dem NOx-Speicher-Katalysator (3) positioniert sein. Es können aber auch mehrere NOx-Sensoren 4A-4C an mehreren Orten positioniert sein. Der NOx-Sensor 4 gibt seinen Messwert an die Motorsteuerung bzw. Rechnereinheit 5 weiter. Der Luft-Massen-Sensor 6 dient zur Motorsteuerung.The internal combustion engine 1 can either be an Otto or an Be a diesel engine and it passes its engine operating state at least one sensor to the engine control or Computer unit 5 further. In the exhaust gas path after Internal combustion engine 1 is a pre-catalyst 2 and behind it is a NOx storage catalytic converter 3. A NOx sensor 4A, 4B, 4C can be in place between the engine 1 and the Pre-catalyst 2 or at the location between the pre-catalyst 2 and the NOx storage catalyst 3 or at the location after NOx storage catalyst (3) must be positioned. But it can also several NOx sensors 4A-4C positioned at several locations his. The NOx sensor 4 gives its measured value to the Motor control or computer unit 5 further. The air mass sensor 6 is used for engine control.

    Der Verbrennungsmotor 1 wird von der Motorsteuerung 5 in Abhängigkeit der Fahrbefehle des Fahrzeugbedieners und in Abhängigkeit der erforderlichen Motorbetriebszustände des Vorbzw. NOx-Katalysators 3 gesteuert und geregelt. Der NOx-Speicher-Katalysator 3 speichert durch Adsorption die NOx-Emissionen in einer Speicherphase und reduziert diese in der Regenerationsphase, so dass die NOx-Emissionen minimiert werden. Der NOx-Sensor 4C nach dem NOx-Speicher-Katalysator 3 zeigt bei Überschreitung eines NOx-Sensor-Grenzwerts der Motorsteuerung 5 an, dass die Speicherphase des NOx-Katalysators 3 beendet und dieser also gesättigt ist. Die Motorsteuerung 5 hat eine NOx-Messkurve gespeichert. Sie steuert die Eichung des NOx-Sensors 4 nach oben beschriebenem Verfahren.The internal combustion engine 1 is operated by the engine control 5 Dependency of the driving commands of the vehicle operator and in Dependency of the required engine operating states of the preliminary or NOx catalyst 3 controlled and regulated. The NOx storage catalytic converter 3 stores the NOx emissions through adsorption in a storage phase and reduces this in the Regeneration phase so that the NOx emissions are minimized become. The NOx sensor 4C after the NOx storage catalyst 3 shows the when a NOx sensor limit value is exceeded Engine control 5 indicates that the storage phase of the NOx catalyst 3 ended and it is saturated. The Engine control 5 has stored a NOx measurement curve. she controls the calibration of the NOx sensor 4 as described above Method.

    Die Motorsteuerung 5 stellt eine Steuervorrichtung dar, welche eine NOx-Messkurve von bekannten NOx-Gehalten zu bestimmten Betriebszuständen gespeichert hat, welche NOx-Messkurve der voll funktionsfähige NOx-Sensoren bei diesen bestimmten Betriebszuständen erfassen müßte. Um Verschlechterungen der Funktion des NOx-Sensors auszugleichen, steuert die Motorsteuerung 5 in oben beschriebener Weise den Motor auf einen vorbestimmten Betriebszustand ein, für welchen sie die NOx-Messkurve gespeichert hat und vergleicht einen vom NOx-Sensor in diesem Betriebszustand tatsächlich erfassten NOx-Messwert oder mehrer erfasste NOx-Messwerte mit den vorgespeicherten NOx-Werten. Aus der Differenz zwischen tatsächlich erfassten NOx-Messwerten und den vorgespeicherten Werten ermittelt die Motorsteuerung 5 einen Korrekturwert zur Korrektur der von dem NOx-Sensor erfaßten NOx-Gehalten. Dieser Korrekturwert wird solange zum Angleich der Messwerte des NOx-Sensors verwendet, bis ein neuer Korrekturwert nach vorstehend beschriebener Vorgehensweise ermittelt wird. Eine Ermittlung eines jeweiligen Korrekturwertes wird bevorzugt in Abständen von xx sec (Bitte bevorzugte Zeitspanne einfügen) durchgeführt.The engine control 5 represents a control device which determine a NOx measurement curve from known NOx contents Operating states, which NOx measurement curve the fully functional NOx sensors in these particular Operating states would have to record. To worsen the Balancing the function of the NOx sensor controls the Motor control 5 on the motor in the manner described above a predetermined operating state for which they are NOx measurement curve has saved and compares one from the NOx sensor NOx measured value actually recorded in this operating state or more measured NOx values with the pre-stored NOx values. From the difference between actually measured NOx values and the pre-stored The engine control 5 determines a correction value for values Correction of the NOx contents detected by the NOx sensor. This The correction value is used to adjust the measured values of the NOx sensor used until a new correction value is given above described procedure is determined. An investigation a respective correction value is preferred at intervals of xx sec (please insert preferred time period).

    Vorteilebenefits

    Die bisher bekannten NOx-Sensoren können somit im Serieneinsatz zur Anwendung kommen. Es sind keine zusätzlichen Kosten für die Erhöhung der Qualität hinsichtlich der Alterungsstabilität der NOx-Sensoren erforderlich.
    Der Einsatz von NOx-Sensoren lässt die Vorteile der Kraftstoffreduzierung und die Erfüllung scharfer Emissionsgrenzwerte realisieren. Das Verfahren und die Vorrichtung erfordern keinen zusätzlichen Bauraum und damit kein wesentliches Mehrgewicht. Darüber hinaus erfordert die Erfindung nur geringe zusätzliche Kosten, da alle wesentlichen Bauteile für die Regelung des NOx-Katalysators und die Diagnose schon vorhanden sind.    The previously known NOx sensors can thus be used in series production. There are no additional costs for increasing the quality with regard to the aging stability of the NOx sensors.
    The use of NOx sensors allows the advantages of fuel reduction and the fulfillment of strict emission limits to be realized. The method and the device require no additional installation space and therefore no significant additional weight. In addition, the invention requires only low additional costs, since all essential components for the regulation of the NOx catalytic converter and the diagnosis are already available.

    Claims (24)

    Verfahren zum Abgleichen von Messwerten eines im Abgasweg eines Verbrennungsmotors (1) angeordneten NOx-Senors (4A, 4B, 4C) auf die zu einem früheren Zeitpunkt von dem NOx-Sensor bezüglich desselben NOx-Gehalts ausgegebenen Signalwerte mit folgenden Verfahrensschritten: Einstellen eines vorbestimmten Betriebszustands des Verbrennungsmotors mit bekanntem NOx-Gehalt im Abgas; Erfassen mindestens eines NOx-Sensor-Signalwertes bei dem vorbestimmten Motorbetriebszustand des Verbrennungsmotors; Vergleichen des mindestens einen mit dem NOx-Sensor gemessenen Signalwertes mit einem dem bekannten NOx-Gehalt entsprechenden Signalwert und Ermitteln der Differenz zwischen dem gemessenen NOx-Gehalt und dem bekannten NOx-Gehalt; Bestimmen eines Korrekturwertes aus der mindestens einen ermittelten Differenz; und Korrigieren der von dem NOx-Sensor gemessenen Signalwerte um den Korrekturwert. Method for comparing measured values of a NOx sensor (4A, 4B, 4C) arranged in the exhaust gas path of an internal combustion engine (1) to the signal values previously output by the NOx sensor with respect to the same NOx content, with the following method steps: Setting a predetermined operating state of the internal combustion engine with a known NOx content in the exhaust gas; Detecting at least one NOx sensor signal value in the predetermined engine operating state of the internal combustion engine; Comparing the at least one signal value measured with the NOx sensor with a signal value corresponding to the known NOx content and determining the difference between the measured NOx content and the known NOx content; Determining a correction value from the at least one determined difference; and Correcting the signal values measured by the NOx sensor by the correction value. Verfahren nach Anspruch 1, wobei in dem vorbestimmten Motorbetriebszustand des Verbrennungsmotors (1) der NOx-Gehalt im Abgas ein Minimum, insbesondere gleich Null, einnimmt.The method of claim 1, wherein in the predetermined Engine operating state of the internal combustion engine (1) the NOx content a minimum, especially zero, in the exhaust gas. Verfahren nach Anspruch 1, wobei in dem vorbestimmten Motorbetriebszustand der NOx-Gehalt im Abgas sehr hoch ist und die Steigung des logarithmischen NOx-Gehaltwerts gegen den Grenzwert Null geht, d.h. der NOx-Sensor in Sättigung betrieben wird.The method of claim 1, wherein in the predetermined Engine operating state, the NOx content in the exhaust gas is very high and the slope of the log NOx value against the Limit goes to zero, i.e. the NOx sensor operated in saturation becomes. Verfahren nach Anspruch 2, wobei der vorbestimmte Motorbetriebszustand die Schubphase des Verbrennungsmotors (1) ist.The method of claim 2, wherein the predetermined Engine operating state, the overrun phase of the internal combustion engine (1) is. Verfahren nach Anspruch 2, wobei der vorbestimmte Motorbetriebszustand dem im Wesentlichen zeitlichen Ende der Regenerationsphase eines NOx-Speicher-Katalysators im Abgasweg des Verbrennungsmotors ist und der NOx-Sensor dem NOx-Speicher-Katalysator nachgeschaltet angeordnet ist.The method of claim 2, wherein the predetermined Engine operating state the essentially temporal end of the Regeneration phase of a NOx storage catalytic converter in the exhaust gas path of the internal combustion engine and the NOx sensor is the NOx storage catalytic converter is arranged downstream. Verfahren nach Anspruch 2, wobei der vorbestimmte Motorbetriebszustand der ausgeschaltete Verbrennungsmotor ist.The method of claim 2, wherein the predetermined Engine operating state is the switched off internal combustion engine. Verfahren nach Anspruch 6, wobei der Abgasweg zusätzlich belüftet wird.The method of claim 6, wherein the exhaust gas path additionally is ventilated. Verfahren nach Anspruch 2, wobei der vorbestimmte Motorbetriebszustand der Zustand unmittelbar nach dem Kaltstart des Verbrennungsmotors ist.The method of claim 2, wherein the predetermined Engine operating state the state immediately after the cold start of the internal combustion engine. Verfahren nach Anspruch 8, wobei der NOx-Sensor vor dem Motorstart vorgeheizt wird.The method of claim 8, wherein the NOx sensor before Engine start is preheated. Verfahren nach Anspruch 2, wobei der vorbestimmte Motorbetriebszustand der Leerlauf des Verbrennungsmotors mit der Luftzahl λ=1 oder λ<1 ist.The method of claim 2, wherein the predetermined Engine operating state of idling the internal combustion engine with the air ratio is λ = 1 or λ <1. Verfahren nach Anspruch 2, wobei der vorbestimmte Motorbetriebszustand ein Zustand im Niedrig- oder Teillastbetrieb mit einer Luftzahl λ>1 nach einer Regenerations-Phase des NOx-Speicher-Katalysators ist.The method of claim 2, wherein the predetermined Engine operating state is a low or state Part load operation with an air ratio λ> 1 after one Regeneration phase of the NOx storage catalyst is. Verfahren nach Anspruch 3, wobei der vorbestimmte Motorbetriebszustand der Betrieb mit einer Luftzahl λ=1,1 ist.The method of claim 3, wherein the predetermined Engine operating state is the operation with an air ratio λ = 1.1. Verfahren nach Anspruch 3, wobei der vorbestimmte Motorbetriebszustand eine klopfende Verbrennung ist.The method of claim 3, wherein the predetermined Engine operating condition is knocking combustion. Verfahren nach Anspruch 3, wobei der vorbestimmte Motorbetriebszustand die Abstellphase des Verbrennungsmotors mit letzten fett-betriebenen Verbrennungen ist.The method of claim 3, wherein the predetermined Engine operating state, the shutdown phase of the internal combustion engine with recent fat-powered burns. Verfahren nach einem der Ansprüche 4, 6, 8, 12, 13 oder 14, wobei der NOx-Sensor vor einem Vor-Katalysator angeordnet ist.Method according to one of claims 4, 6, 8, 12, 13 or 14, the NOx sensor being arranged in front of a pre-catalyst. Verfahren nach einem der Ansprüche 1 bis 15, wobei das Abgleichen in bestimmten zeitlichen Abständen durchgeführt wird.Method according to one of claims 1 to 15, wherein the Adjustments are carried out at certain time intervals becomes. Vorrichtung zum Ermitteln des NOx-Gehalts im Abgasweg eines Verbrennungsmotors (1), mit einem NOx-Sensor (4A, 4B, 4C), von dem der NOx-Gehalt im Abgasweg erfaßt wird und ein zugehöriger NOx-Sensor-Signalwert generiert wird, und mit einer Steuervorrichtung (5), die mit dem NOx-Sensor verbunden ist, wobei die Steuervorrichtung derart ausgebildet ist, dass von ihr ein vorbestimmter Betriebszustand des Verbrennungsmotors mit bekanntem NOx-Gehalt im Abgas einstellbar ist, wobei ihr mindestens ein NOx-Sensor-Signalwert bei dem vorbestimmten Motorbetriebszustand des Verbrennungsmotors von dem NOx-Sensor zugeführt wird, dass von ihr der mindestens eine zugeführte NOx-Sensor-Signalwert mit einem dem bekannten NOx-Gehalt entsprechenden Signalwert vergleichbar und die Differenz zwischen dem gemessenen NOx-Gehalt und dem bekannten NOx-Gehalt ermittelbar ist, dass von ihr aus der mindestens einen ermittelten Differenz ein Korrekturwert ermittelbar ist, und dass von ihr die vom NOx-Sensor erhaltenen NOx-Sensor-Signalwerte unter Ermittlung von jeweiligen NOx-Gehalt-Signalwerten, die den jeweiligen NOx-Gehalten im Abgas entsprechen, mittels des Korrekturwerts korrigierbar sind.Device for determining the NOx content in the exhaust gas path Internal combustion engine (1), with a NOx sensor (4A, 4B, 4C), from which the NOx content in the exhaust gas path is recorded and an associated NOx sensor signal value is generated, and with a Control device (5) connected to the NOx sensor, wherein the control device is designed such that from a predetermined operating state of the internal combustion engine is adjustable with a known NOx content in the exhaust gas, with her at least one NOx sensor signal value at the predetermined one Engine operating state of the internal combustion engine from the NOx sensor is supplied that the at least one fed from it NOx sensor signal value with a known NOx content corresponding signal value comparable and the difference between the measured NOx content and the known NOx content it can be determined that from it at least one determined difference, a correction value can be determined, and that the NOx sensor signal values obtained from the NOx sensor by determining respective NOx content signal values, the respective NOx levels in the exhaust gas correspond, can be corrected by means of the correction value. Vorrichtung nach Anspruch 17, wobei der NOx-Sensor nach einem NOx-Speicher-Katalysator angeordnet ist.The apparatus of claim 17, wherein the NOx sensor is after a NOx storage catalyst is arranged. Vorrichtung nach Anspruch 17, wobei der NOx-Sensor vor einem NOx-Speicher-Katalysator angeordnet ist, und wobei die Steuervorrichtung derart ausgebildet ist, dass von ihr die Schubphase des Verbrennungsmotors (1) als vorbestimmter Motorbetriebszustand eingestellt wird.The apparatus of claim 17, wherein the NOx sensor is in front a NOx storage catalyst is arranged, and wherein the Control device is designed such that the Thrust phase of the internal combustion engine (1) as a predetermined Engine operating state is set. Vorrichtung nach Anspruch 17, wobei der NOx-Sensor vor einem NOx-Speicher-Katalysator angeordnet ist, und wobei die Steuervorrichtung derart ausgebildet ist, dass von ihr der ausgeschaltete Verbrennungsmotor als vorbestimmter Motorbetriebszustand eingestellt wird. The apparatus of claim 17, wherein the NOx sensor is in front a NOx storage catalyst is arranged, and wherein the Control device is designed such that the switched off internal combustion engine as a predetermined Engine operating state is set. Vorrichtung nach Anspruch 17, wobei der NOx-Sensor vor einem NOx-Speicher-Katalysator angeordnet ist, und wobei die Steuervorrichtung derart ausgebildet ist, dass von ihr der Zustand unmittelbar nach dem Kaltstart des Verbrennungsmotors als vorbestimmter Motorbetriebszustand eingestellt wird.The apparatus of claim 17, wherein the NOx sensor is in front a NOx storage catalyst is arranged, and wherein the Control device is designed such that the State immediately after the cold start of the internal combustion engine is set as a predetermined engine operating condition. Vorrichtung nach Anspruch 17, wobei der NOx-Sensor vor einem NOx-Speicher-Katalysator angeordnet ist, und wobei die Steuervorrichtung derart ausgebildet ist, dass von ihr der Motorbetrieb mit einer Luftzahl λ=1,1 als vorbestimmter Motorbetriebszustand eingestellt wird.The apparatus of claim 17, wherein the NOx sensor is in front a NOx storage catalyst is arranged, and wherein the Control device is designed such that the Engine operation with an air ratio λ = 1.1 as a predetermined Engine operating state is set. Verfahren nach Anspruch 17, wobei der NOx-Sensor vor einem NOx-Speicher-Katalysator angeordnet ist, und wobei die Steuervorrichtung derart ausgebildet ist, dass von ihr ein Motorbetrieb mit klopfender Verbrennung als vorbestimmter Motorbetriebszustand eingestellt wird.The method of claim 17, wherein the NOx sensor is in front of one NOx storage catalyst is arranged, and wherein the Control device is designed such that one of them Engine operation with knocking combustion as predetermined Engine operating state is set. Verfahren nach Anspruch 17, wobei der NOx-Sensor vor einem NOx-Speicher-Katalysator angeordnet ist, und wobei die Steuervorrichtung derart ausgebildet ist, dass von ihr die Abstellphase des Verbrennungsmotors mit letzten fettbetriebenen Verbrennungen als vorbestimmter Motorbetriebszustand eingestellt wird.The method of claim 17, wherein the NOx sensor is in front of one NOx storage catalyst is arranged, and wherein the Control device is designed such that the Shutdown phase of the internal combustion engine with the last grease-powered ones Burns as predetermined Engine operating state is set.
    EP01128691A 2001-01-26 2001-12-01 Method and apparatus for operating a NOx-sensor located in the exhaust line of an internal combustion engine Expired - Lifetime EP1227234B1 (en)

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    DE10103415A DE10103415A1 (en) 2001-01-26 2001-01-26 Method and device for operating a NOx sensor arranged in the exhaust gas path of an internal combustion engine

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    FR2853934A1 (en) * 2003-04-16 2004-10-22 Volkswagen Ag Procedure for determining offset signal value from NOx detector in IC engine exhaust system, uses signal values taken during stoichiometric operating mode
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