EP3152432B1 - Procédé de correction d'une caractéristique lambda de tension - Google Patents

Procédé de correction d'une caractéristique lambda de tension Download PDF

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Publication number
EP3152432B1
EP3152432B1 EP15724331.2A EP15724331A EP3152432B1 EP 3152432 B1 EP3152432 B1 EP 3152432B1 EP 15724331 A EP15724331 A EP 15724331A EP 3152432 B1 EP3152432 B1 EP 3152432B1
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Prior art keywords
probe
lambda
voltage
temperature
correction
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EP15724331.2A
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German (de)
English (en)
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EP3152432A1 (fr
Inventor
Michael Fey
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—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
    • 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
    • F02D41/1454—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 oxygen content or concentration or the air-fuel ratio
    • F02D41/1455—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 oxygen content or concentration or the air-fuel ratio with sensor resistivity varying with oxygen 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
    • F02D41/02—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
    • F02D41/1493—Details
    • F02D41/1494—Control of sensor heater

Definitions

  • the invention relates to a method for correcting a voltage-lambda characteristic of a two-point lambda probe arranged in an exhaust duct of an internal combustion engine in the event of deviation from a reference voltage lambda characteristic by adaptation, wherein a temperature-dependent nominal value of the two-point lambda probe checks under supply of heating power becomes.
  • exhaust gas sensors are used to control the combustion process and the exhaust aftertreatment, including two-point and / or broadband lambda probes.
  • the optimization requires that the measured quantities are determined reliably and accurately via the probes.
  • a decisive factor here is the unambiguous relationship between a physically measured variable and the measured variable to be determined, which as a rule is present over a characteristic curve.
  • a shift of the characteristic with respect to a reference characteristic, for example, due to tolerances or aging can lead to a much higher pollutant emissions.
  • a method of the type mentioned is from the DE 10 2008 005 110 A1 known.
  • a method for operating a lambda probe in the exhaust system of an internal combustion engine in which a correction value is determined and from this an operating setpoint value of the lambda probe is determined.
  • the correction value determination is carried out on the basis of temperature characteristic curves of the ohmic resistance or internal resistance of the lambda probe while applying the lambda probe with a defined or undefined heat output during vehicle operation.
  • the WO 2012/080000 A1 relates to a method for performing a zero point adaptation of a lambda probe, wherein fresh air is pumped from an air supply system into the exhaust gas guide section, so that the lambda probe is surrounded by fresh air.
  • the circulation with fresh air takes place after switching off the internal combustion engine in a follow-up phase.
  • An exact procedure for performing the zero point adaptation is not specified.
  • DE 10 2010 027 984 A1 is a method for operating an exhaust system of an internal combustion engine specified, wherein during an operating state in which no injection and combustion of fuel takes place, the exhaust duct upstream of the exhaust gas probe by means of a fresh air supply fresh air is supplied, and during and / or after the exhaust gas probe is adjusted. Further details on the adjustment of the probe are not made.
  • the EP 2 466 300 A1 indicates a method for adjusting a lambda signal of a lambda probe, which is performed in a phase in which no exhaust gas is passed through the exhaust tract, during the shutdown of the engine.
  • the DE 10 2012 208 145 A1 discloses a method for evaluating the condition of an exhaust gas sensor by measuring its internal resistance, wherein the exhaust gas sensor is subjected to a measuring current.
  • the DE 10 2012 212 580 A1 relates to a method of operating an exhaust gas probe in an exhaust passage, wherein a measure of the probe aging is determined from the deviation between an actual ceramic temperature and an expected ceramic temperature and a Nernst voltage is corrected according to the amount of probe aging.
  • a method for compensating for a voltage offset of a voltage lambda characteristic curve is specified, which is carried out within the control range of the two-point lambda probe in a lambda range around 1, as prevails in regular operation of the internal combustion engine.
  • the DE 10 2012 212 596 A1 relates to another method for operating an exhaust gas probe.
  • From the DE 10 2010 211 687 A1 is a method for detecting a deviation and from the DE 10 2012 211 683 A1 a method for correcting a lambda characteristic of a arranged in an exhaust passage of an internal combustion engine two-point lambda probe relative to a corresponding reference voltage lambda characteristic known.
  • it describes how a constant characteristic curve offset or a temperature-dependent deviation of the actual lambda characteristic curve of a two-point probe upstream of the catalytic converter from the reference voltage lambda characteristic curve can be detected and compensated.
  • a continuous lambda control with a two-point lambda probe is possible.
  • the described methods presuppose that successive engine operating conditions have to be run through until full compensation of the deviation has occurred for the first time (“Uradaption").
  • the drive profile must include phases of excess air (e.g., fuel cutoff) and phases of constant engine speed and load for a period of time before the U-turn is completed and steady state lambda control is possible as intended.
  • the Uradaption may be delayed, so that in this case, the benefits of a continuous lambda control come later to bear. Functions that rely on continuous lambda control are then blocked if necessary.
  • diagnoses at the beginning of vehicle life which are dependent on the steady-state lambda control, may also reach. not the frequency required by law.
  • the adaptation is carried out at non-operated internal combustion engine at the end of the vehicle assembly before the first operation of the internal combustion engine or when replacing the lambda probe, the adaptation is coupled to suitable switch-on that ensure that the probe is not damaged during heating and
  • the inventive method allows an adaptation of characteristic shifts already from the first engine start, so that even at the first start-up of a vehicle, a continuous lambda control is possible.
  • functionalities can be used from the beginning, which rely on a continuous lambda control, such as. Catalyst diagnosis or component protection. This in turn leads in the field regardless of the driving profile already at the beginning of vehicle life to lower emissions and lower fuel consumption.
  • the running frequency of diagnoses that depend on continuous lambda control is improved.
  • a temperature-dependent shift in the voltage-lambda characteristic curve is checked independently of the voltage and lambda and corrected for deviation from a reference value.
  • This allows an adaptation of a temperature-dependent characteristic shift independent of other method steps, unlike in the documents named at the outset DE 10 2010 211 687 A1 and DE 10 2012 211 683 A1 , In particular, no prior examination is required regarding a shift of the lambda 1 point and a constant voltage offset in advance, which allows detection of a temperature-induced characteristic shift when the engine is stopped.
  • a voltage offset of the voltage-lambda characteristic is determined and corrected. As a result, the adaptation of the characteristic becomes more extensive and reaches a higher accuracy.
  • correction values of the first step and of the second step are stored in a control device and used for the future correction of the temperature-related displacement and / or the voltage offset during the operation of the internal combustion engine, these correction values can be used at any time for the continuous lambda control be used. Furthermore, they are available as required, directly or after further processing, as initialization values for further adaptation methods, for example for plausibility checking.
  • the control device is preferably integrated in the engine control.
  • the probe internal resistance is detected as a temperature-dependent nominal value.
  • the determined heating power is an indirect measure of the temperature of the two-point lambda probe, although for this purpose another variable, for example the heating voltage or a probe temperature measured directly via a temperature sensor, could be used.
  • the reference heating value stored in the control device can be, for example, a characteristic curve be removed.
  • several reference values can also be used here. This makes sense, for example, if the first step is repeated with different nominal values of the probe internal resistance. Thus, different value pairs can in particular be matched to a probe internal resistance temperature characteristic. This also allows the consideration of different causes for the shift, for example, different component tolerances in the periphery.
  • the determined setpoint correction aims to set a required nominal temperature of the two-point lambda probe.
  • the second step is preferably carried out if the engine was not running immediately before, so as not to be still e.g. there is too much residual gas or water in the measuring volume.
  • the second step is independent of a lambda-1 shift feasible.
  • the correction values of the first step and of the second step stored in the control device be plausibilized during a subsequent operation of the internal combustion engine.
  • the aforementioned documents DE 10 2010 211 687 and DE 10 2012 211 683 A1 .
  • Very well reproducible conditions for carrying out the method are present when the adaptation is carried out at the end of the vehicle assembly, before the first operation of the internal combustion engine.
  • This refers above all to defined ambient conditions and a high excess of air in the exhaust pipe.
  • the Uradaption can be integrated into an already provided at the end of the tape assembly test, in which the two-point lambda probe is heated up.
  • the adaptation according to the invention is repeated in later vehicle life, for example in order to make plausibility or to optimize earlier adaptations.
  • it can be provided to repeat them when replacing the lambda probe. It is expedient in this case to couple the adaptation or its repetition to suitable switch-on conditions, which in particular ensure that the probe is not damaged during the heating up and that suitable environmental conditions exist for the detection and correction of characteristic shiftings.
  • the method according to the invention can advantageously be used for two-point lambda probes in front of and behind the catalyst. Also, the adaptation could take place before installation, in which case, however, the periphery in which the two-point lambda probe is embedded after installation is not taken into account.
  • Fig. 1 schematically shows the technical environment in which the method according to the invention can be applied.
  • An internal combustion engine 10 which is designed as a gasoline engine, combustion air is supplied via a supply air duct 11.
  • the amount of air of the combustion air can be determined by means of a Zu Kunststoffmess Huawei 12 in the supply air duct 11.
  • the amount of air supplied serves to determine the amount of fuel to be metered in at a lambda value to be preselected, as well as exhaust gas parameters such as a quantity of exhaust gas, a volumetric flow or an exhaust gas velocity.
  • the exhaust gas of the internal combustion engine 10 is passed through an exhaust passage 17 in which a catalyst 16 is arranged.
  • a first lambda probe 15 in front of the catalytic converter 16 and a second lambda sensor 18 behind the catalytic converter 16 are arranged in the exhaust gas channel 17, the signals of which are fed to a motor control 14.
  • the engine control unit 14 is furthermore connected to the supply air measuring device 12 and determines, on the basis of the data supplied to it, an amount of fuel which can be supplied to the internal combustion engine 10 via a fuel metering device 13.
  • correction values determined for the adaptation in a performance of the method according to the invention are stored in the engine control unit 14 and the correction of characteristic shiftings is made.
  • the reference characteristic curves and / or values required for the method according to the invention are likewise stored in the engine control 14, so that it functions as a control device required in the method according to the invention.
  • a probe heater which is not shown here, also connected to the motor controller 14 and is controlled by this.
  • Fig. 2 shows a resistance-temperature diagram 20 of the first lambda probe 15, which could be similar to that of the second lambda probe 18, with a temperature axis 24 (in this case the abscissa) and a resistance axis 21 (in this case the ordinate).
  • a first probe internal resistance temperature characteristic curve 22 corresponds to an ideal characteristic curve of a new lambda probe without tolerances, which thus represents the reference characteristic curve.
  • a second probe internal resistance temperature characteristic curve 23 corresponds to the characteristic curve of a new two-point lambda probe, which has been moved upwards by component tolerances is. Likewise, it could be moved down.
  • a two-point lambda probe with the first probe internal resistance temperature characteristic curve 22 is regulated to a nominal resistance value 25, that is to say the nominal value of the probe internal resistance, then a first temperature 26 sets.
  • a second temperature 27 results, which deviates upward from the first temperature 26 and thus leads to an incorrectly determined lambda value, since this has a temperature dependence.
  • a voltage lambda diagram 30 with a lambda axis 32 and a voltage axis 31 is shown.
  • a reference voltage lambda characteristic 35 of an ideal two-point lambda probe without tolerances is plotted.
  • a voltage-lambda characteristic 36 shifted by a largely constant voltage offset is shown, as it can result from component tolerances. Between a rich region 33 and a lean region 34, the curves show a sudden change in the course.
  • a first step of the method according to the invention can now be based on the in Fig. 2 shown relationships determine how far the second temperature 27 deviates from the first temperature 26 in regulation to the nominal resistance value 25. Based on this, the heating power of the probe heater is corrected so that the first temperature 26 sets in the future. Thus, a temperature-induced characteristic shift of the voltage-lambda characteristic curve is corrected.
  • the inventive method can be independent of a lambda-1 shift and especially when the engine is stopped be applied. In this way, a method for an independent of the operation of the internal combustion engine adaptation of characteristic shifts of a two-point lambda probe can be provided.

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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)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Claims (9)

  1. Procédé de correction d'une caractéristique lambda de tension (36) d'une sonde lambda à deux points (15, 18) disposée dans un tuyau de gaz d'échappement (17) d'un moteur à combustion interne par adaptation lors d'un écart par rapport à une caractéristique lambda de tension de référence (35), dans lequel on vérifie une valeur nominale dépendant de la température de la sonde lambda à deux points (15, 18) par apport d'une puissance de chauffage, caractérisé en ce que l'on effectue l'adaptation lorsque le moteur à combustion interne n'est pas en fonctionnement, à la fin du montage du véhicule avant le premier fonctionnement du moteur à combustion interne ou lors du remplacement de la sonde lambda, dans lequel l'adaptation est couplée à des conditions de mise en service appropriées, qui assurent que la sonde n'est pas endommagée lors du chauffage et qu'il règne des conditions ambiantes appropriées pour la détection et la correction de déplacements de la caractéristique, en ce que dans une première étape de l'adaptation on vérifie un déplacement dû à la température de la caractéristique lambda de tension (36) indépendamment de la tension et du lambda et en cas d'écart par rapport à une valeur de référence on la corrige, et en ce que dans une deuxième étape de l'adaptation, en se basant sur la correction du déplacement dû à la température, on détermine et on corrige un décalage de tension de la caractéristique lambda de tension (36).
  2. Procédé selon la revendication 1, caractérisé en ce que l'on mémorise des valeurs de correction de la première étape et de la deuxième étape dans un dispositif de commande et on les utilise pour des corrections futures du déplacement dû à la température et/ou du décalage de tension pendant le fonctionnement du moteur à combustion interne.
  3. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on détecte la résistance interne de la sonde comme valeur nominale dépendant de la température.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on vérifie le déplacement dû à la température à l'aide d'une caractéristique de température de résistance interne de la sonde (22, 23) de la sonde lambda à deux points.
  5. Procédé selon l'une quelconque des revendications 2 à 4, caractérisé en ce que dans la première étape
    - on chauffe rapidement la sonde lambda à deux points (15, 18) et on régule le chauffage de la sonde de telle manière que la valeur nominale s'établisse pour la résistance interne de la sonde,
    - on détermine la puissance de chauffage effectivement requise, qui est nécessaire pour le fonctionnement de la sonde lambda à deux points (15, 18) à la valeur nominale de la résistance interne de la sonde,
    - on compare la puissance de chauffage effectivement requise avec une valeur de puissance de chauffage de référence mémorisée dans le dispositif de commande et on forme une différence de puissance de chauffage correspondante,
    - on détermine une correction de valeur de consigne pour la régulation de la puissance de chauffage sur la base de cette différence de puissance de chauffage, qui forme la valeur de correction de la première étape, et
    - on régule le chauffage de la sonde sur la valeur de consigne corrigée.
  6. Procédé selon l'une quelconque des revendications 2 à 5, caractérisé en ce que dans la deuxième étape
    - on mesure la tension de la sonde, et
    - on compare la tension de la sonde effectivement mesurée avec une valeur de référence mémorisée dans le dispositif de commande et on forme une différence de tension correspondante, qui forme la valeur de correction de la deuxième étape.
  7. Procédé selon la revendication 6, caractérisé en ce que l'on effectue la mesure de la tension de la sonde en présence d'un excès d'air élevé de λ > 5.
  8. Procédé selon l'une quelconque des revendications 2 à 7, caractérisé en ce que l'on rend plausibles les valeurs de correction de la première étape et de la deuxième étape mémorisées dans le dispositif de commande, pendant un fonctionnement ultérieur du moteur à combustion interne.
  9. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on effectue l'adaptation indépendamment d'un déplacement du point lambda-1.
EP15724331.2A 2014-06-03 2015-05-27 Procédé de correction d'une caractéristique lambda de tension Active EP3152432B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014210442.4A DE102014210442A1 (de) 2014-06-03 2014-06-03 Verfahren zur Korrektur einer Spannungs-Lambda-Kennlinie
PCT/EP2015/061720 WO2015185414A1 (fr) 2014-06-03 2015-05-27 Procédé de correction d'une caractéristique lambda de tension

Publications (2)

Publication Number Publication Date
EP3152432A1 EP3152432A1 (fr) 2017-04-12
EP3152432B1 true EP3152432B1 (fr) 2018-08-29

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EP15724331.2A Active EP3152432B1 (fr) 2014-06-03 2015-05-27 Procédé de correction d'une caractéristique lambda de tension

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EP (1) EP3152432B1 (fr)
CN (1) CN106414968B (fr)
DE (1) DE102014210442A1 (fr)
WO (1) WO2015185414A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016211506A1 (de) 2016-06-27 2017-12-28 Robert Bosch Gmbh Verfahren und Vorrichtung zur Überwachung der Funktionsfähigkeit einer Abgasreinigungsanlage
DE102016211595A1 (de) 2016-06-28 2017-12-28 Robert Bosch Gmbh Verfahren und Vorrichtung zur Steuerung und/ oder Überwachung der Funktion einer Sekundärluftzuführung in einer Abgasreinigungsanlage
DE102016219689A1 (de) 2016-10-11 2018-04-12 Robert Bosch Gmbh Verfahren und Steuereinrichtung zur Regelung einer Sauerstoff-Beladung eines Dreiwege-Katalysators
FR3062167B1 (fr) * 2017-01-26 2020-06-12 Renault S.A.S Methode et dispositif d'etalonnage d'un capteur d'oxygene.

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008005110B4 (de) * 2008-01-15 2018-10-25 Volkswagen Ag Verfahren und Steuerung zum Betreiben und Einstellen einer Lambda-Sonde
DE102010027984A1 (de) * 2010-04-20 2011-10-20 Robert Bosch Gmbh Verfahren zum Betreiben einer Abgasanlage einer Brennkraftmaschine
DE102010063095A1 (de) * 2010-12-15 2012-06-21 Robert Bosch Gmbh Verfahren und Vorrichtung zum Durchführen einer Nullpunktadaption einer Lambdasonde eines Verbrennungsmotors
EP2466300B1 (fr) * 2010-12-16 2017-07-26 FCA Italy S.p.A. Méthode d'adaptation du signal d'une sonde lambda et un système d'adaptation correspondant
DE102012208145A1 (de) * 2012-05-15 2013-11-21 Robert Bosch Gmbh Verfahren und Vorrichtung zur Beurteilung des Zustands eines Abgassensors
DE102012208092B4 (de) * 2012-05-15 2022-02-24 Robert Bosch Gmbh Verfahren und Steuereinheit zur Kompensation eines Spannungsoffsets einer Zweipunkt-Lambdasonde
DE102012211687B4 (de) * 2012-07-05 2024-03-21 Robert Bosch Gmbh Verfahren und Steuereinheit zur Erkennung eines Spannungsoffsets einer Spannungs-Lambda-Kennlinie
DE102012211683B4 (de) * 2012-07-05 2024-03-21 Robert Bosch Gmbh Verfahren und Vorrichtung zur Korrektur einer Kennlinie einer Zweipunkt-Lambdasonde
DE102012212596A1 (de) * 2012-07-18 2014-01-23 Robert Bosch Gmbh Verfahren und Vorrichtung zum Betreiben einer Abgassonde
DE102012212580A1 (de) * 2012-07-18 2014-01-23 Robert Bosch Gmbh Verfahren und Vorrichtung zum Betreiben einer Abgassonde

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WO2015185414A1 (fr) 2015-12-10
EP3152432A1 (fr) 2017-04-12
DE102014210442A1 (de) 2015-12-17
CN106414968A (zh) 2017-02-15
CN106414968B (zh) 2019-12-17

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