EP3155251B1 - Procédé permettant d'évaluer l'écart d'une courbe caractéristique - Google Patents

Procédé permettant d'évaluer l'écart d'une courbe caractéristique Download PDF

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Publication number
EP3155251B1
EP3155251B1 EP15726131.4A EP15726131A EP3155251B1 EP 3155251 B1 EP3155251 B1 EP 3155251B1 EP 15726131 A EP15726131 A EP 15726131A EP 3155251 B1 EP3155251 B1 EP 3155251B1
Authority
EP
European Patent Office
Prior art keywords
deviation
lambda
characteristic curve
correction
threshold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP15726131.4A
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German (de)
English (en)
Other versions
EP3155251A1 (fr
Inventor
Michael Fey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP3155251A1 publication Critical patent/EP3155251A1/fr
Application granted granted Critical
Publication of EP3155251B1 publication Critical patent/EP3155251B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • F02D41/1495—Detection of abnormalities in the air/fuel ratio feedback system
    • 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
    • F02D41/2454—Learning of the air-fuel ratio control
    • 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 for evaluating the deviation of at least one region of a characteristic curve of an exhaust gas sensor arranged in an exhaust gas duct of an internal combustion engine from at least one reference value.
  • the invention also relates to a corresponding device.
  • exhaust gas sensors such as two-point and / or broadband lambda probes and / or NO x sensors are used to regulate the combustion process and exhaust gas aftertreatment. Optimization assumes that the measured variables are reliably and precisely determined by the sensors.
  • a decisive factor here is the clear connection between a physically measured variable and the to determining measured variable, which is usually available via a characteristic curve. A shift in the characteristic curve with respect to a reference characteristic curve, for example due to aging, can lead to a multiple increase in pollutant emissions.
  • a two-point lambda probe also called a jump probe or Nernst probe
  • the two-point lambda probe therefore generally differentiates between rich exhaust gas ( ⁇ ⁇ 1) when the internal combustion engine is operated with excess fuel and lean exhaust gas ( ⁇ > 1) when operated with excess air.
  • a two-point lambda probe which is more cost-effective than a broadband lambda probe, allows continuous lambda control upstream of the catalytic converter, at least in a restricted lambda range. Due to the rather flat course of the characteristic curve, this requires good agreement with a reference lambda characteristic curve over the entire service life of the probe. Otherwise the accuracy of the regulation is insufficient and impermissibly high emissions can occur.
  • 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 curve of a two-point lambda probe arranged in an exhaust duct of an internal combustion engine with respect to a corresponding one Reference lambda characteristic known.
  • it describes how a constant characteristic offset or a temperature-related deviation of the actual lambda characteristic of a two-point probe upstream of the catalytic converter from the reference lambda characteristic can be recognized and compensated for.
  • Continuous lambda control with a two-point lambda probe is thus possible.
  • an implausibly high correction requirement is determined, which for example indicates a defective probe or another malfunction. If a correction were carried out in this case, this could possibly lead to the desired safe regulation for an optimized pollutant emission not being achieved.
  • the invention is therefore based on the object of providing a robust method for characteristic curve correction in order to ensure reliable pollutant optimization, as well as a device for carrying out such a method.
  • the object of the invention relating to the method is achieved in that at least one threshold is specified for assessing the deviation, which threshold forms a criterion for the distinction between a tolerable and an intolerable correction requirement.
  • the application of the criterion allows a differentiated reaction through different measures.
  • the at least one threshold can be above and / or below the at least one reference value. It can also be specified as absolute or relative.
  • the exhaust gas sensor is a two-point lambda probe and the characteristic is a lambda characteristic and that the reference values are taken from a reference lambda characteristic.
  • the application of the method according to the invention with respect to a two-point lambda probe allows the more reliable use of such a probe for an emission-optimized regulation of the engine combustion process.
  • a method that includes the heating power and / or another, in particular a resistance temperature Characteristic curve of the lambda probe can have other advantages, e.g. that they can be carried out partly independently of the lambda characteristic curve (which here denotes the voltage-lambda characteristic curve).
  • the selected method or a combination of several methods can be used several times, and the deviation can be determined and / or determined from one or more mean values. In this way, the plausibility of the results can be checked.
  • a deviation can be evaluated if the at least one threshold delimits a plausibility range from an area outside the plausibility range.
  • the at least one threshold and thus the plausibility range is flexibly defined.
  • a definition according to the tolerances of a fault-free exhaust gas sensor is useful.
  • the goal is that the deviation is compared with the threshold, the deviation within the plausibility range being assessed as a tolerable correction requirement and the deviation outside the plausibility range as an intolerable correction requirement.
  • This evaluation can be used as part of a decision-making procedure with regard to the selection which of the differentiated reactions is to be used advantageously in the present case.
  • a deviation outside the plausibility range it is assumed that there is a malfunction, in particular of the exhaust gas sensor, its electrical wiring in an assigned control unit or the control unit software for operating the exhaust gas sensor, so that a reaction other than complete correction of the deviation is likely to be useful.
  • a reaction that is adapted to the need can be achieved by correcting the deviation in the event of a tolerable need for correction and by triggering a different reaction when a non-tolerable need for correction is determined.
  • the required accuracy of an exhaust gas sensor can be guaranteed by correcting the deviation in the case of a tolerable correction requirement. It is advantageous if this correction is carried out by eliminating the cause of a deviation, such as that mentioned above, for example DE 10 2012 211 683 A1 described.
  • Another reaction in the case of an intolerable need for correction serves to increase the robustness of the entire method for error detection and compensation. Corrective measures that are not meaningful and that would have a negative rather than positive effect can be intercepted and replaced by correspondingly more meaningful measures. Corrective measures that would not be feasible to the extent required can also be replaced by other reactions.
  • the other response is designed to be triggered depending on the cause diagnosed.
  • she will then triggered when a temperature offset detection indicates that the temperature of the two-point lambda probe is clearly too cold or the temperature offset detection indicates that the temperature of the two-point lambda probe is significantly too high or an implausibly high positive voltage offset is detected or an implausibly high negative voltage offset is detected.
  • a different response is particularly useful because the necessary corrections may not be feasible or there is a high probability that there is another known but not immediately correctable cause for the deviation.
  • the probe element temperature would have to be increased implausibly as a corrective measure, for which the heating power may not be available, or it would have to be reduced, which may not be possible.
  • a non-tolerable need for correction arises, for example, if the temperature would have to be changed by more than -50 K to +0 K with respect to the nominal temperature of the probe, which can be 730 ° C, for example, in order to correct the determined deviation.
  • the voltage offset there is an intolerable need for correction, for example if it is more than ⁇ 15 mV, for example.
  • An implausibly high positive voltage offset can indicate a shunt between the probe signal line and battery voltage, an implausibly negative voltage offset, for example, to poisoning of the oxygen reference of the probe.
  • the correction to a threshold value By limiting the correction to a threshold value, malfunctions are to be avoided, for example damage to the exhaust gas sensor due to overheating.
  • the limitation of the correction to a substitute value is provided in particular for the case when a complete correction is not possible and a correction to the threshold value conceals the deviation outside the plausibility range would, in particular for other diagnostic units, so that the exhaust gas sensor, for example, would not be displayed as faulty, although it would be necessary.
  • the substitute value can also mean that no correction is made. Instead of or in addition to a correction, provision can be made to set status information which makes the restricted function of the exhaust gas sensor recognizable.
  • the lambda control can be deactivated and switched to lambda precontrol, so that excessively high emissions or increased fuel consumption due to the intolerable deviation are avoided.
  • the method according to the invention can be used in a particularly targeted manner when different other reactions are triggered, depending on how far the deviation lies outside the plausibility range and / or that different other reactions are triggered depending on the cause of the deviation from the plausibility range.
  • Preferred areas of application arise when a two-point lambda probe is used, which is located in front of or behind a catalytic converter.
  • the method according to the invention can thus be used flexibly for differently positioned two-point lambda probes and is not restricted to a specific probe installation location.
  • the object of the invention relating to the device is achieved in that at least one reference value and a comparison stage are specified in the program sequence or in the circuit, in which the determined deviation is compared with the at least one reference value and that the control device, depending on the comparison result, either a Corrects the deviation or triggers another reaction.
  • Figure 1 shows a voltage-lambda diagram 10 of a two-point lambda probe, with a voltage axis 11 and a lambda axis 12.
  • a reference lambda 171 is deduced from the assumed reference lambda characteristic curve 15.
  • a lambda characteristic curve 16 is shown, which is shifted upwards in relation to the reference lambda characteristic curve 15 in the rich region 13. Such a shift can result, for example, from tolerances, aging or temperature effects, or from a superposition of several effects. If such a shift occurs that is not corrected, the voltage 170 actually corresponds to the actual lambda 172 instead of the reference lambda 171, which differs by a deviation 18.
  • the method according to the invention can be assessed by comparison with at least one threshold whether the deviation 18 lies within a plausibility range. Then it makes sense to correct it, preferably by eliminating the cause. Because while, for example, [fey2si1] tolerances in the electrical wiring of the probe can lead to a constant offset with corresponding deviations in the rich and lean range (13, 14), this usually results from an incorrect probe temperature a different deviation in the fat and lean range (13, 14). In the lean area 14, this is typically about 1/6 of the shift in the rich area 13, so that a mere offset shift would not be able to achieve a complete correction.

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

Claims (5)

  1. Procédé permettant d'évaluer un écart (18) par rapport à au moins une plage d'une courbe caractéristique lambda (16) d'une sonde lambda à deux points disposée dans un conduit de gaz d'échappement d'un moteur à combustion interne par rapport à au moins une valeur de référence prise dans une courbe caractéristique lambda de référence (15), dans lequel l'écart (18) par rapport à au moins une valeur de référence de la courbe caractéristique lambda de référence (15) est déterminé après qu'un écart par rapport à la courbe caractéristique lambda de référence (15) a été corrigé à lambda = 1, dans lequel, pour déterminer l'écart (18) à partir d'une paire de valeurs sur la courbe caractéristique lambda de référence, une modification de la composition du mélange air/carburant fourni au moteur à combustion interne est effectuée vers lambda = 1 et la modification de la composition du mélange air/carburant est utilisée pour déduire la valeur effective de lambda,
    caractérisé en ce qu'au moins un seuil est prédéfini pour évaluer l'écart (18), lequel seuil constitue un critère de distinction entre une exigence de correction tolérable et une exigence de correction non tolérable, en ce qu'au moins un seuil délimite une plage de plausibilité par rapport à une plage située en dehors de la plage de plausibilité, en ce que l'écart (18) est comparé au seuil, dans lequel un écart (18) se situant à l'intérieur de la plage de plausibilité est évalué comme étant une exigence de correction tolérable et un écart (18) se situant en dehors de la plage de plausibilité est évalué comme étant une exigence de correction non tolérable, en ce qu'une correction de l'écart (18) est effectuée en cas d'exigence de correction tolérable et en ce qu'une réaction différente est déclenchée en cas d'exigence de correction non tolérable.
  2. Procédé selon la revendication 1,
    caractérisé en ce que ledit au moins un seuil et par conséquent, la plage de plausibilité, sont définis de manière flexible.
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'autre réaction est au moins l'une des mesures suivantes
    - limitation de la correction de l'écart (18) à la valeur de seuil,
    - limitation de la correction à une valeur de remplacement,
    - définition d'une information de statut pour indiquer que l'écart (18) se situe en dehors de la plage de plausibilité,
    - fourniture d'une entrée dans une mémoire de défauts d'un dispositif de commande.
  4. Procédé selon la revendication 3,
    caractérisé en ce que différentes autres réactions sont déclenchées, selon que l'écart (18) se situe plus ou moins en dehors de la plage de plausibilité et/ou en ce que différentes autres réactions sont déclenchées selon la cause de l'écart (18) en-dehors de la plage de plausibilité.
  5. Dispositif conçu pour mettre en œuvre un procédé selon l'une des revendications précédentes.
EP15726131.4A 2014-06-11 2015-05-29 Procédé permettant d'évaluer l'écart d'une courbe caractéristique Not-in-force EP3155251B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014211069.6A DE102014211069A1 (de) 2014-06-11 2014-06-11 Verfahren zur Auswertung der Abweichung einer Kennlinie
PCT/EP2015/061962 WO2015189052A1 (fr) 2014-06-11 2015-05-29 Procédé permettant d'évaluer l'écart d'une courbe caractéristique

Publications (2)

Publication Number Publication Date
EP3155251A1 EP3155251A1 (fr) 2017-04-19
EP3155251B1 true EP3155251B1 (fr) 2020-11-25

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Application Number Title Priority Date Filing Date
EP15726131.4A Not-in-force EP3155251B1 (fr) 2014-06-11 2015-05-29 Procédé permettant d'évaluer l'écart d'une courbe caractéristique

Country Status (4)

Country Link
EP (1) EP3155251B1 (fr)
CN (1) CN106471238B (fr)
DE (1) DE102014211069A1 (fr)
WO (1) WO2015189052A1 (fr)

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JPS62175657A (ja) * 1986-01-30 1987-08-01 Fujikura Ltd 気体濃度測定方法
DE3840148A1 (de) * 1988-11-29 1990-05-31 Bosch Gmbh Robert Verfahren und vorrichtung zum erkennen eines fehlerzustandes einer lambdasonde
KR940004344B1 (ko) * 1990-07-10 1994-05-23 미쯔비시지도오샤고오교오 가부시기가이샤 공연비 제어장치
DE4243493A1 (de) * 1992-12-22 1994-06-23 Bosch Gmbh Robert Verfahren und Vorrichtung zur Überwachung einer Steuereinrichtung
DE10258426B4 (de) * 2002-12-13 2008-08-21 Siemens Ag Verfahren und Vorrichtung zum Überwachen einer Steuereinrichtung einer Brennkraftmaschine
DE102004025156B3 (de) * 2004-05-21 2005-07-21 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Verfahren zur Fehlerkorrektur eines Wegsensorsignals
DE102010046954B4 (de) * 2010-09-29 2012-04-12 Robert Bosch Gmbh Verfahren zur Kalibrierung, Validierung und Justierung einer Lambdasonde
DE102010063119A1 (de) * 2010-12-15 2012-06-21 Robert Bosch Gmbh Verfahren zur Regelung und Adaption eines Luft-/Kraftstoffgemischs in einem Verbrennungsmotor
DE102011013392A1 (de) * 2011-03-09 2012-09-13 Daimler Ag Verfahren zur Regelung eines Verbrennungsmotors
DE102012211683B4 (de) 2012-07-05 2024-03-21 Robert Bosch Gmbh Verfahren und Vorrichtung zur Korrektur einer Kennlinie einer Zweipunkt-Lambdasonde
US9057338B2 (en) * 2012-11-09 2015-06-16 GM Global Technology Operations LLC Exhaust gas oxygen sensor fault detection systems and methods using fuel vapor purge rate
DE102012221552A1 (de) * 2012-11-26 2014-05-28 Robert Bosch Gmbh Verfahren und Vorrichtung zum Betrieb eines Abgassensors

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
CN106471238B (zh) 2020-09-22
CN106471238A (zh) 2017-03-01
EP3155251A1 (fr) 2017-04-19
DE102014211069A1 (de) 2015-12-17
WO2015189052A1 (fr) 2015-12-17

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