WO2015189052A1 - 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
WO2015189052A1
WO2015189052A1 PCT/EP2015/061962 EP2015061962W WO2015189052A1 WO 2015189052 A1 WO2015189052 A1 WO 2015189052A1 EP 2015061962 W EP2015061962 W EP 2015061962W WO 2015189052 A1 WO2015189052 A1 WO 2015189052A1
Authority
WO
WIPO (PCT)
Prior art keywords
deviation
lambda
characteristic
correction
probe
Prior art date
Application number
PCT/EP2015/061962
Other languages
German (de)
English (en)
Inventor
Michael Fey
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to EP15726131.4A priority Critical patent/EP3155251B1/fr
Priority to CN201580030958.8A priority patent/CN106471238B/zh
Publication of WO2015189052A1 publication Critical patent/WO2015189052A1/fr

Links

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 device for evaluating the deviation of at least one region of a characteristic of an exhaust gas duct of an internal combustion engine arranged exhaust gas sensor of reference values, wherein a control device is provided, and wherein in the control device, a program sequence or a circuit is provided.
  • Exhaust gas aftertreatment exhaust gas sensors used such as
  • Two-point and / or broadband lambda probes and / or NO x sensors Optimization requires that the measured quantities are determined reliably and accurately via the sensors.
  • a decisive factor here is the clear relationship between a physically measured variable and the one to determining measured variable, which is usually present over a characteristic.
  • the two-point lambda probe usually differs substantially between rich exhaust gas ( ⁇ ⁇ 1) during operation of the
  • this has the disadvantage that in operating modes for which a lean or rich air-fuel mixture is necessary (for example catalyst diagnosis or component protection), the target lambda can only be adjusted in a precontrolled manner, but can not be regulated.
  • From DE 10 2010 211 687 AI is a method for detecting a
  • Deviation and from DE 10 2012 211 683 AI 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 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 lambda characteristic curve can be detected and compensated.
  • a continuous lambda control with a two-point lambda probe is possible.
  • the invention is therefore based on the object to provide a robust method for characteristic correction to ensure reliable pollutant optimization, and an apparatus for performing such
  • the object of the invention relating to the method is solved by specifying at least one threshold for the assessment of the deviation, which constitutes a criterion for the distinction between a tolerable and an intolerable correction requirement.
  • the application of the criterion allows a differentiated reaction by different measures.
  • Reference value Also, it can be absolute or relative.
  • the exhaust gas sensor is a lambda probe, in particular a two-point lambda probe, if the characteristic curve is a lambda characteristic curve and if the reference values are taken from a reference lambda characteristic curve.
  • the application of the method according to the invention with respect to a lambda, in particular a two-point lambda probe allows the more reliable use of such a probe for emission-optimized control of the engine combustion process.
  • Close reference value for example, a method involving the heating power and / or another, in particular a resistance temperature characteristic of the lambda probe. Such methods may be different
  • 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 are set flexibly. It makes sense, for example, a definition according to the tolerances of a faultless exhaust gas sensor.
  • the goal is that the deviation is compared with the threshold, wherein the deviation within the plausibility range is assessed as a tolerable correction requirement and the deviation outside the plausibility range as a non-tolerable correction requirement.
  • a response adapted to the case of need can be achieved by correcting the deviation given a tolerable correction requirement, and by determining a non-tolerable correction requirement
  • Corrective action which would have a negative rather than positive effect, be intercepted and replaced by more appropriate measures. Corrective action, which would not be feasible to the extent necessary, can be replaced by other reactions.
  • the other reaction is triggered depending on the diagnosed cause. In particular, she will then triggered when a temperature offset detection on a significantly too cold
  • Temperature offset detection indicates a significantly high temperature of the two-point lambda probe or an implausibly high positive voltage offset is detected or an implausibly high negative voltage offset is detected.
  • another reaction is particularly useful because the necessary corrections may not be feasible, or there is a high probability of another known but not immediately correctable cause of the deviation.
  • the probe temperature is significantly too low or too high, the probe element temperature would have to be increased implausibly as a corrective measure, for which reason the heating power might be reduced. is not available, or it would have to be lowered, which u.U. not possible.
  • a non-tolerable correction requirement arises, for example, when the temperature is more than -50 K to +0 K relative to the nominal temperature of the probe, e.g.
  • the correction to a threshold malfunction should be avoided, eg damage to the exhaust gas sensor by 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 obscure the deviation outside the plausibility range in particular for other diagnostic units, so that the exhaust gas sensor would not, for example, be displayed as faulty, although it would be required.
  • the replacement value can also mean that no correction is made.
  • the method according to the invention can be used particularly purposefully if 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.
  • the object of the invention relating to the device is achieved in that at least one reference value and one comparison step are predetermined in the program sequence or in the circuit, in which the determined deviation is compared with the at least one reference value, and the control device either one depending on the comparison result Correcting the deviation or triggering another reaction.
  • An expedient area of use of the device is when the exhaust gas sensor a
  • 1 shows a voltage lambda diagram of a two-point lambda probe
  • FIG. 1 shows a voltage lambda diagram 10 of a two-point lambda probe, with a voltage axis 11 and a lambda axis 12.
  • the reference lambda characteristic curve 15 has a fat region 13 ( ⁇ ⁇ 1) and a lean region 14 ( ⁇ > 1), where at ⁇
  • FIG. 1 shows a lambda characteristic curve
  • the voltage 170 real corresponds to the actual lambda 172 instead of the reference lambda 171, which differs by a deviation 18.

Landscapes

  • 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)

Abstract

L'invention concerne un procédé et un dispositif permettant d'évaluer l'écart (18) d'au moins une plage d'une courbe caractéristique d'un capteur de gaz d'échappement, disposé dans un conduit d'échappement d'un moteur à combustion interne, par rapport à au moins une valeur de référence. Un procédé robuste de correction de courbe caractéristique permettant une optimisation fiable des polluants est obtenu par le fait qu'aux fins d'évaluation dudit écart (18) au moins une valeur seuil est prédéfinie, laquelle constitue un critère permettant d'établir une distinction entre un besoin de correction tolérable et un besoin de correction non tolérable.
PCT/EP2015/061962 2014-06-11 2015-05-29 Procédé permettant d'évaluer l'écart d'une courbe caractéristique WO2015189052A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP15726131.4A EP3155251B1 (fr) 2014-06-11 2015-05-29 Procédé permettant d'évaluer l'écart d'une courbe caractéristique
CN201580030958.8A CN106471238B (zh) 2014-06-11 2015-05-29 用于分析处理特性曲线的偏差的方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014211069.6 2014-06-11
DE102014211069.6A DE102014211069A1 (de) 2014-06-11 2014-06-11 Verfahren zur Auswertung der Abweichung einer Kennlinie

Publications (1)

Publication Number Publication Date
WO2015189052A1 true WO2015189052A1 (fr) 2015-12-17

Family

ID=53276130

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Application Number Title Priority Date Filing Date
PCT/EP2015/061962 WO2015189052A1 (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)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3840148A1 (de) * 1988-11-29 1990-05-31 Bosch Gmbh Robert Verfahren und vorrichtung zum erkennen eines fehlerzustandes einer lambdasonde
DE4122828A1 (de) * 1990-07-10 1992-01-16 Mitsubishi Motors Corp Luft-brennstoff-verhaeltnis-steuersystem
DE4243493A1 (de) * 1992-12-22 1994-06-23 Bosch Gmbh Robert Verfahren und Vorrichtung zur Überwachung einer Steuereinrichtung
DE10258426A1 (de) * 2002-12-13 2004-07-15 Siemens Ag Verfahren und Vorrichtung zum Überwachen einer Steuereinrichtung einer Brennkraftmaschine
DE102012211683A1 (de) * 2012-07-05 2014-01-09 Robert Bosch Gmbh Verfahren und Vorrichtung zur Korrektur einer Kennlinie einer Zweipunkt-Lambdasonde
DE102012221552A1 (de) * 2012-11-26 2014-05-28 Robert Bosch Gmbh Verfahren und Vorrichtung zum Betrieb eines Abgassensors
DE102013222502A1 (de) * 2012-11-09 2014-06-05 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Systeme und Verfahren zur Detektion eines Defekts eines Abgassauerstoffsensors unter Verwendung einer Kraftstoffdampfspülrate

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62175657A (ja) * 1986-01-30 1987-08-01 Fujikura Ltd 気体濃度測定方法
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

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3840148A1 (de) * 1988-11-29 1990-05-31 Bosch Gmbh Robert Verfahren und vorrichtung zum erkennen eines fehlerzustandes einer lambdasonde
DE4122828A1 (de) * 1990-07-10 1992-01-16 Mitsubishi Motors Corp Luft-brennstoff-verhaeltnis-steuersystem
DE4243493A1 (de) * 1992-12-22 1994-06-23 Bosch Gmbh Robert Verfahren und Vorrichtung zur Überwachung einer Steuereinrichtung
DE10258426A1 (de) * 2002-12-13 2004-07-15 Siemens Ag Verfahren und Vorrichtung zum Überwachen einer Steuereinrichtung einer Brennkraftmaschine
DE102012211683A1 (de) * 2012-07-05 2014-01-09 Robert Bosch Gmbh Verfahren und Vorrichtung zur Korrektur einer Kennlinie einer Zweipunkt-Lambdasonde
DE102013222502A1 (de) * 2012-11-09 2014-06-05 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Systeme und Verfahren zur Detektion eines Defekts eines Abgassauerstoffsensors unter Verwendung einer Kraftstoffdampfspülrate
DE102012221552A1 (de) * 2012-11-26 2014-05-28 Robert Bosch Gmbh Verfahren und Vorrichtung zum Betrieb eines Abgassensors

Also Published As

Publication number Publication date
CN106471238B (zh) 2020-09-22
DE102014211069A1 (de) 2015-12-17
CN106471238A (zh) 2017-03-01
EP3155251B1 (fr) 2020-11-25
EP3155251A1 (fr) 2017-04-19

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