WO2001055565A2 - PROCEDE ET DISPOSITIF POUR DETERMINER LA CONCENTRATION DE NOx DANS LE COURANT DE GAZ D"ECHAPPEMENT D"UN MOTEUR A COMBUSTION INTERNE - Google Patents

PROCEDE ET DISPOSITIF POUR DETERMINER LA CONCENTRATION DE NOx DANS LE COURANT DE GAZ D"ECHAPPEMENT D"UN MOTEUR A COMBUSTION INTERNE Download PDF

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Publication number
WO2001055565A2
WO2001055565A2 PCT/EP2001/000540 EP0100540W WO0155565A2 WO 2001055565 A2 WO2001055565 A2 WO 2001055565A2 EP 0100540 W EP0100540 W EP 0100540W WO 0155565 A2 WO0155565 A2 WO 0155565A2
Authority
WO
WIPO (PCT)
Prior art keywords
minimum
measuring device
combustion engine
search
found
Prior art date
Application number
PCT/EP2001/000540
Other languages
German (de)
English (en)
Other versions
WO2001055565A3 (fr
Inventor
Hermann Hahn
Sören HINZE
Original Assignee
Volkswagen Aktiengesellschaft
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 Volkswagen Aktiengesellschaft filed Critical Volkswagen Aktiengesellschaft
Priority to AU2001237318A priority Critical patent/AU2001237318A1/en
Priority to EP01909650A priority patent/EP1255917B1/fr
Priority to DE50108081T priority patent/DE50108081D1/de
Publication of WO2001055565A2 publication Critical patent/WO2001055565A2/fr
Publication of WO2001055565A3 publication Critical patent/WO2001055565A3/fr

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Classifications

    • 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 a device for determining a NO ⁇ concentration of an exhaust gas flow of an internal combustion engine by means of a NO x- sensitive measuring device, in particular an NO x probe, arranged downstream of a NO x storage catalytic converter in an exhaust gas line of the internal combustion engine.
  • NO ⁇ storage catalytic converters In the exhaust duct of the internal combustion engine, which are operated alternately in NO x storage phases and regeneration phases. For maximum reduction of a NO x emission, it is advantageous to control the NO ⁇ storage catalytic converter or the internal combustion engine as a function of a NO ⁇ concentration present behind the NOx storage catalytic converter. This requires an exact detection of a current NO ⁇ concentration, for which NOx sensors are used.
  • Each NO x sensor has an individual error measure, which leads to deviations of a displayed measured value from an actual actual value of the NO ⁇ concentration.
  • These individual inaccuracies in the characteristic of the sensor NO ⁇ - lead to errors in the control of the internal combustion engine so that, for example, an NO x -Beladungsgrad of the NOx trap is detected inaccurately, can be switched whereby a regenerating too late. This leads to increased NO x emissions.
  • the invention has for its object to improve the accuracy of the determination of the NO ⁇ content of an exhaust gas.
  • the method according to the invention provides, in an operating phase of the internal combustion engine in which it is known that the NO ⁇ concentration at the position of the NOx-sensitive measuring device passes through a value close to zero Search for a minimum of a signal curve of the measuring device and to take the found minimum as the zero point for a calibration of the measuring device.
  • the search for the minimum is carried out directly or shortly after NO regeneration or desulfurization of the NOx storage catalytic converter. Following NO ⁇ or sulfur regeneration, even with a severely damaged catalytic converter, it can be assumed that the NO. Absorption will be almost 100% accurate. In this phase, a NOx concentration of 0 to 5 ppm behind the catalytic converter can be expected at least for a limited period of time, so that a minimal signal of the NO ⁇ measuring device obtained in this phase with a negligible error as zero point for an offset correction of the NO ⁇ sensor can be taken over.
  • signal values of the measuring device are detected at predetermined time intervals or according to predetermined exhaust gas or reducing agent throughputs in order to search for the minimum.
  • Each measured signal value is compared with a last saved minimum. If the signal value is less than the last found minimum, it is saved as a new minimum.
  • the search for the minimum is ended after a predetermined duration or a predetermined exhaust gas or reducing agent throughput has elapsed.
  • the described method ensures that a minimum found in this way corresponds to an absolute minimum in the signal curve of the measuring device and not, for example, a local minimum, which can be caused, for example, by an irregularity in the sensor characteristic.
  • a very preferred embodiment of the method according to the invention therefore provides for the minimum found to be subjected to a plausibility check. For this, one or more criteria must be met before a minimum is accepted as the zero point for the calibration. According to a preferred embodiment, for example, it is required that the minimum found must fall below an upper threshold value. Furthermore, falling below the upper threshold value may be required for a certain minimum period. As another Criterion can be specified that the minimum found is located at a sufficiently large distance from a start and an end point of the minimum search. In this way, it is checked whether the "valley floor" in which the minimum lies is really in the time window of the minimum search.
  • An extremely advantageous embodiment of the method also provides that the minimum search is terminated and / or a found minimum is not adopted as the zero point for the calibration of the measuring device if predetermined boundary conditions for operating parameters are not met during the minimum search.
  • An important boundary condition relates, for example, to a temperature of the NO ⁇ storage catalytic converter, which should be in a range which ensures satisfactory NO x absorption.
  • Another boundary condition requires lean operation of the internal combustion engine and / or the presence of a lean exhaust gas in the area of the NO ⁇ storage catalytic converter and / or in the area of the measuring device. In addition, this can be requested over a predetermined minimum period.
  • the internal combustion engine is not in a fuel cut-off phase and / or not in an idle state and / or not in a highly unsteady operating mode during the minimum search.
  • a satisfactory NO ⁇ storage behavior of a NO ⁇ storage catalytic converter can be required, which is determined, for example, by a diagnostic method.
  • An upper and / or lower limit can also be specified for a NO x raw mass flow emitted by the internal combustion engine.
  • the device according to the invention provides means with which the method steps described above can be carried out.
  • These means preferably comprise a control unit, in which the procedure for controlling the method steps for determining a NOx concentration is stored in digital form, wherein the control unit can be integrated in an engine control unit.
  • Figure 1 is a schematic representation of an exhaust duct
  • Figure 2 is a representation of a sensor characteristic of an NO ⁇ sensor
  • Figure 3 shows a sensor signal as a function of time during the
  • the arrangement of an internal combustion engine 10 shown schematically in FIG. 1 has an exhaust tract 12 with an optional pre-catalytic converter 14 arranged therein and a NO x storage catalytic converter 16.
  • a NO x sensor 18 is also arranged in the exhaust duct 12 downstream of the NO ⁇ storage catalytic converter 16.
  • the NO x sensor 18 transmits a measurement signal to an engine control unit 20 in which a control unit 22 is integrated.
  • the internal combustion engine 10 by, for example, influence on a Popespeisendes air-fuel mixture increases.
  • FIG. 2 shows a characteristic curve K of a NO x sensor 18.
  • the output signal OUT of the sensor 18, which can be a voltage, for example, is shown here as a function of a NO x concentration in the exhaust gas.
  • the characteristic curve K which runs linearly in the area of application of the NO x sensor 18 is characterized by the slope S, that is to say its sensitivity, and by the so-called offset OS, which corresponds to an output signal in the absence of NO x in the exhaust gas.
  • the zero point of the characteristic curve is known as a special case, it can at least be used for an offset correction.
  • the output signal OUT of the NO ⁇ sensor In order to detect the zero point signal of the NO ⁇ sensor 18, in a situation in which the NO ⁇ concentration at the position of the sensor 18 is known or can be assumed to be approximately zero, the output signal OUT of the NO ⁇ sensor must be obtained 18 can be measured. The signal measured in this way can then be defined as the zero point of the sensor 18.
  • An operating situation in which a NO ⁇ concentration behind the NO x storage catalytic converter 16 can be assumed to be close to zero with a sufficiently high probability is given shortly after regeneration, in particular NO x regeneration, of the NO x storage catalytic converter 16 ,
  • FIG. 3 shows an idealized time profile of a signal curve SK of a NO x sensor 18 arranged downstream of a NO x storage catalytic converter 16 during the change from a rich operating mode (regeneration phase R) to a lean operating mode M of the internal combustion engine 10.
  • the sensor signal OUT remains at a relatively high level. This is due on the one hand to an incomplete reduction of desorbed nitrogen oxides NO x and on the other hand to the formation of ammonia NH3 during regeneration R, to which the NO x sensor 18 also responds.
  • the signal OUT initially remains at this relatively high level depending on a dead volume of the exhaust gas duct and on a space velocity of the exhaust gas.
  • an inherent inertia of the NO ⁇ sensor 18 leads to a delay in the response of the signal curve SK, even if lean exhaust gas is already present behind the NO ⁇ storage catalytic converter 16.
  • the signal curve SK runs through a minimum min shortly after the switchover to the lean mode M, in order then to rise again very slowly as a result of increasing loading of the NO x storage catalytic converter 16.
  • signal curves SK which correspond to a less ideal course than the one shown, are also accessible to the evaluation.
  • the described method thus also enables a low signal-to-noise ratio, that is, a high one Background noise, and in the event of irregularities in the characteristic curve K, as is observed in particular in the case of aged NO x sensors 18, reliable detection of the minimum min.
  • the minimum search is ended after a predetermined period of time after switching to the lean mode M at the time t £. Instead of a period of time, an exhaust gas or reducing agent mass which has been passed through or a number of measuring points can also be specified.
  • the minimum for calibration is only released if further boundary conditions are met.
  • This relates, for example, to a temperature of the NO x storage catalytic converter 16, which should be in a range that guarantees reliable storage of NO x .
  • a threshold value SW is shown in FIG. It can also be required that the threshold SW must be undershot for a predetermined minimum duration.
  • the minimum min is immediately released as the zero point of the NO x sensor 18 and an offset correction of the sensor 18 is carried out.
  • the found minimum min remains valid until a new minimum is determined in a subsequent minimum search.
  • a minimum search can be carried out after each NOx regeneration - provided the boundary conditions described are met.

Abstract

L"invention concerne un procédé et un dispositif pour la détermination de la concentration de NOx dans un courant de gaz d"échappement d"un moteur à combustion interne, au moyen d"un dispositif de mesure sensible aux NOx, en particulier d"un capteur de NOx monté en aval d"un catalyseur accumulateur de NOx, dans le système d"échappement de gaz du moteur à combustion interne. Selon l"invention, il est prévu que, dans une phase de fonctionnement du moteur à combustion interne (10) pendant laquelle la concentration de NOx à l"emplacement du dispositif de mesure sensible aux NOx (18) présente une valeur proche de zéro, un minimum (min) d"une courbe de signal (SK) du dispositif de mesure (18) soit recherché et que le minimum (min) trouvé soit pris comme point zéro pour un étalonnage du dispositif de mesure (18).
PCT/EP2001/000540 2000-01-26 2001-01-18 PROCEDE ET DISPOSITIF POUR DETERMINER LA CONCENTRATION DE NOx DANS LE COURANT DE GAZ D"ECHAPPEMENT D"UN MOTEUR A COMBUSTION INTERNE WO2001055565A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU2001237318A AU2001237318A1 (en) 2000-01-26 2001-01-18 Method and device for detecting a nox concentration of an exhaust gas stream pertaining to combustion engine
EP01909650A EP1255917B1 (fr) 2000-01-26 2001-01-18 PROCEDE ET DISPOSITIF POUR DETERMINER LA CONCENTRATION DE NOx DANS LE COURANT DE GAZ D'ECHAPPEMENT D'UN MOTEUR A COMBUSTION INTERNE
DE50108081T DE50108081D1 (de) 2000-01-26 2001-01-18 VERFAHREN UND VORRICHTUNG ZUR BESTIMMUNG EINER NOx-KONZENTRATION EINES ABGASSTROMES EINER VERBRENNUNGSKRAFTMASCHINE

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10003228.1 2000-01-26
DE2000103228 DE10003228A1 (de) 2000-01-26 2000-01-26 Verfahren und Vorrichtung zur Bestimmung einer NOx-Konzentration eines Abgasstromes einer Verbrennungskraftmaschine

Publications (2)

Publication Number Publication Date
WO2001055565A2 true WO2001055565A2 (fr) 2001-08-02
WO2001055565A3 WO2001055565A3 (fr) 2002-01-10

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Country Status (4)

Country Link
EP (1) EP1255917B1 (fr)
AU (1) AU2001237318A1 (fr)
DE (2) DE10003228A1 (fr)
WO (1) WO2001055565A2 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1365234A2 (fr) * 2002-01-24 2003-11-26 Volkswagen AG Procédé de correction du signal NOx d'un capteur de NOx
EP1434049A1 (fr) * 2002-12-29 2004-06-30 Volkswagen AG Procédé et dispositif pour surveiller le signal NOx d'un capteur de NOx
FR2853934A1 (fr) * 2003-04-16 2004-10-22 Volkswagen Ag Procede destine a la determination d'une valeur offset d'un signal de detecteur, ainsi que dispositif pour la mise en oeuvre du procede
FR2948979A1 (fr) * 2009-08-07 2011-02-11 Peugeot Citroen Automobiles Sa Methode de diagnostic et de controle d'un capteur d'oxydes d'azote
CN114166990A (zh) * 2021-12-03 2022-03-11 国网湖南省电力有限公司 基于NOx浓度时域特征分析的脱硝喷氨均匀性检测方法
WO2023165777A1 (fr) * 2022-03-03 2023-09-07 Vitesco Technologies GmbH Procédé d'étalonnage d'un capteur de gaz d'échappement d'un moteur à combustion interne pour un véhicule et moteur à combustion interne pour un véhicule

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10223385B4 (de) * 2002-05-25 2017-01-05 Volkswagen Ag Verfahren und Vorrichtung zur Steuerung eines Sensors
DE10249610B4 (de) * 2002-10-18 2010-10-07 Volkswagen Ag Verfahren und Vorrichtung zur Steuerung eines NOx-Speicherkatalysators
DE10310954A1 (de) * 2003-03-13 2004-09-23 Robert Bosch Gmbh Verfahren zur Diagnose eines NOx-Sensors
DE10339062A1 (de) * 2003-04-16 2004-11-11 Volkswagen Ag Verfahren zur Bestimmung eines Offsetwertes eines Sensorsignals sowie Vorrichtung zur Durchführung des Verfahrens
DE10326932A1 (de) * 2003-06-16 2005-01-27 Audi Ag Verfahren zur Überprüfung eines Stickoxid-Sensors einer einen Stickoxid-Speicherkatalysator aufweisenden Brennkraftmaschine
DE102004022814B4 (de) * 2004-05-08 2010-06-10 Audi Ag Verfahren zum Betreiben einer magerlauffähigen Brennkraftmaschine eines Fahrzeuges, insbesondere eines Kraftfahrzeuges

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0878709A2 (fr) * 1997-03-21 1998-11-18 NGK Spark Plug Co. Ltd. Procédé et appareil de mesure de la concentration d'oxydes d'azote
EP0916941A2 (fr) * 1997-10-14 1999-05-19 NGK Spark Plug Co. Ltd. Procédé et dispositif pour détecter une condition de fonctionnement d'un catalyseur NOx à occlusion
EP0969194A2 (fr) * 1998-07-02 2000-01-05 Nissan Motor Company, Limited Dispositif et procédé pour déterminer la détérioration d'un catalyseur NOx à occlusion

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0878709A2 (fr) * 1997-03-21 1998-11-18 NGK Spark Plug Co. Ltd. Procédé et appareil de mesure de la concentration d'oxydes d'azote
EP0916941A2 (fr) * 1997-10-14 1999-05-19 NGK Spark Plug Co. Ltd. Procédé et dispositif pour détecter une condition de fonctionnement d'un catalyseur NOx à occlusion
EP0969194A2 (fr) * 1998-07-02 2000-01-05 Nissan Motor Company, Limited Dispositif et procédé pour déterminer la détérioration d'un catalyseur NOx à occlusion

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1365234A2 (fr) * 2002-01-24 2003-11-26 Volkswagen AG Procédé de correction du signal NOx d'un capteur de NOx
EP1365234A3 (fr) * 2002-01-24 2004-06-23 Volkswagen AG Procédé de correction du signal NOx d'un capteur de NOx
EP1434049A1 (fr) * 2002-12-29 2004-06-30 Volkswagen AG Procédé et dispositif pour surveiller le signal NOx d'un capteur de NOx
FR2853934A1 (fr) * 2003-04-16 2004-10-22 Volkswagen Ag Procede destine a la determination d'une valeur offset d'un signal de detecteur, ainsi que dispositif pour la mise en oeuvre du procede
FR2948979A1 (fr) * 2009-08-07 2011-02-11 Peugeot Citroen Automobiles Sa Methode de diagnostic et de controle d'un capteur d'oxydes d'azote
CN114166990A (zh) * 2021-12-03 2022-03-11 国网湖南省电力有限公司 基于NOx浓度时域特征分析的脱硝喷氨均匀性检测方法
CN114166990B (zh) * 2021-12-03 2023-11-14 国网湖南省电力有限公司 基于NOx浓度时域特征分析的脱硝喷氨均匀性检测方法
WO2023165777A1 (fr) * 2022-03-03 2023-09-07 Vitesco Technologies GmbH Procédé d'étalonnage d'un capteur de gaz d'échappement d'un moteur à combustion interne pour un véhicule et moteur à combustion interne pour un véhicule

Also Published As

Publication number Publication date
EP1255917B1 (fr) 2005-11-16
DE10003228A1 (de) 2001-09-06
EP1255917A2 (fr) 2002-11-13
DE50108081D1 (de) 2005-12-22
WO2001055565A3 (fr) 2002-01-10
AU2001237318A1 (en) 2001-08-07

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