EP1959121B1 - Monitor zur Sensorenaktivierung - Google Patents

Monitor zur Sensorenaktivierung Download PDF

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Publication number
EP1959121B1
EP1959121B1 EP20070102404 EP07102404A EP1959121B1 EP 1959121 B1 EP1959121 B1 EP 1959121B1 EP 20070102404 EP20070102404 EP 20070102404 EP 07102404 A EP07102404 A EP 07102404A EP 1959121 B1 EP1959121 B1 EP 1959121B1
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EP
European Patent Office
Prior art keywords
sensor
determinations
indicating
certain level
time period
Prior art date
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EP20070102404
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English (en)
French (fr)
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EP1959121A1 (de
Inventor
Peter Smeds
Anders Unger
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Ford Global Technologies LLC
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Ford Global Technologies LLC
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Priority to EP20070102404 priority Critical patent/EP1959121B1/de
Priority to DE200760002050 priority patent/DE602007002050D1/de
Priority to CN 200810008232 priority patent/CN101245739B/zh
Publication of EP1959121A1 publication Critical patent/EP1959121A1/de
Application granted granted Critical
Publication of EP1959121B1 publication Critical patent/EP1959121B1/de
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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
    • F02D41/02—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
    • F02D41/02—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
    • F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
    • F02D41/1474—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method by detecting the commutation time of the sensor

Definitions

  • the present invention is related to a method for verifying timely activation of a heated exhaust gas binary oxygen sensor arranged in an exhaust after-treatment system of a vehicle following start-up of an associated internal combustion engine in accordance with the preamble of claim 1.
  • the present invention further relates to an on-board diagnostic system for verifying timely activation of a heated exhaust gas binary oxygen sensor arranged in an exhaust after-treatment system of a vehicle following start-up of an associated internal combustion engine in accordance with the preamble of claim 6.
  • Emission control is becoming an increasingly important issue in automotive vehicles having internal combustion engines.
  • Sensors in an associated exhaust after treatment system are used to verify proper operation of the exhaust after treatment system as well as providing input to engine management systems, for operating the associated engine in an appropriate way to reduce emissions there from.
  • One such sensor commonly used is the so called binary oxygen sensor.
  • a binary oxygen sensor must have a certain temperature to work correctly.
  • An aged or malfunctioning sensor may not be timely activated after engine start, but possibly activated after a longer time period than normal, causing unwanted emissions.
  • the binary oxygen sensor may also comprise a sensor heater, used to heat the sensor in order to bring it to its operating temperature faster. In the same way, an aged or malfunctioning sensor heater may cause unwanted emissions.
  • US 5 801 295 describes an on-board diagnostic test for a heated exhaust gas oxygen sensor which includes sensing the output of the oxygen sensor and summing the output over a specified period to determine the length of the trace of the sensor voltage versus time. Such length over a given time period indicates the activity of the sensor. This data is compared to a threshold to determine if the exhaust gas oxygen sensor meets certain performance requirements.
  • US 5 801 295 provides monitoring of a heated exhaust gas oxygen sensor during normal operating conditions, i.e. when the engine is at operating temperature and during favorable operation thereof. Frequency of switching is used as an indication of the sensitivity, robustness and age of the sensor. US 5 801 295 provides no monitoring of timely sensor activation following engine start.
  • An object of the present invention is to provide an improved method for verifying timely activation of a heated exhaust gas binary oxygen sensor arranged in an exhaust after-treatment system of a vehicle following start-up of an associated internal combustion engine, through which method a malfunctioning sensor may be detected such that the risk of unwanted emissions may be eliminated or at least reduced.
  • this object is achieved in accordance with the characterizing portion of claim 1, which specifies that it comprises the steps of: determining if entry conditions are met; detecting changes in an electrical signal output by the sensor; detecting a maximum value of the signal; accumulating the detected signal changes; determining if the accumulation is above a predetermined threshold within a first time period following start-up; determining if the maximum value is above a predetermined reference value within a second time period following start-up; if at least one of the determinations are positive, indicating a functioning sensor and if both determinations are negative, indicating a malfunctioning sensor.
  • a second object of the present invention is to provide an improved on-board diagnostic system for verifying timely activation of a heated exhaust gas binary oxygen sensor arranged in an exhaust after-treatment system of a vehicle following start-up of an associated internal combustion engine, through which method a malfunctioning sensor may be detected such that the risk of unwanted emissions may be eliminated or at least reduced.
  • this object is achieved in accordance with the characterizing portion of claim 6, which specifies that that it comprises: means for determining if entry conditions are met; means for detecting changes in an electrical signal output by the sensor; means for detecting a maximum value of the signal; means for accumulating the detected signal changes; means for determining if the accumulation is above a predetermined threshold within a first time period following start-up; means for determining if the maximum value is above a predetermined reference value within a second time period following start-up; means for, if at least one of the determinations are positive, indicating a functioning sensor and if both determinations are negative, indicating a malfunctioning sensor.
  • the method starts at block 1.
  • entry conditions For verifying timely activation of a heated exhaust gas binary oxygen sensor arranged in an exhaust after-treatment system of a vehicle following start-up of an associated internal combustion engine it is firstly determined in block 2 if entry conditions are met. As an entry condition is performed at least one of a determination that: an electric sensor heater is energized; the ambient temperature is above a certain level; the ambient atmospheric pressure is above a certain level, the engine number of revolutions is above a certain level; the coolant temperature of the engine is within a certain range; the battery voltage is above a certain level; fuel is not cut-off. If entry conditions are met the method proceeds to block 3, if not the method loops back to the start block 1.
  • block 4 it is determined if the accumulation is above a predetermined threshold within a first time period following start-up, and in block 5 it is determined if the maximum value is above a predetermined reference value within a second time period following start-up. If at least one of these determinations 4, 5 is positive, a functioning sensor is indicated in block 6 and if both determinations are negative, a malfunctioning sensor is indicated in block 7. Thereafter the method is terminated by end block 11.
  • the first, second, third and fourth time periods may be chosen as respective predetermined time periods or alternatively be determined as a function of an accumulation of an amount of an engine parameter. Examples of such accumulations that may be used for establishing the time periods are: an amount of engine revolutions; an amount of airflow; an amount of load; an amount of lambda; an amount of temperature; an amount of exhaust gas energy.
  • the third and fourth time period should be longer than the corresponding first and second time periods in order to allow a determination of a functioning sensor having a malfunctioning sensor heater, through the sensor responding after a longer time period than if properly heated.
  • the above method is preferably implemented in an on-board diagnostic system for verifying timely activation of a heated exhaust gas binary oxygen sensor arranged in an exhaust after-treatment system of a vehicle following start-up of an associated internal combustion engine.
  • such an on-board diagnostic system comprises means for determining if entry conditions are met. Integral to the means for determining if entry conditions are met are provided means for performing as an entry condition at least one of a determination that: an electric sensor heater is energized; the ambient temperature is above a certain level; the ambient atmospheric pressure is above a certain level, the engine number of revolutions is above a certain level; the coolant temperature of the engine is within a certain range; the battery voltage is above a certain level; fuel is not cut-off.
  • means for detecting changes in an electrical signal output by the sensor means for detecting a maximum value of the signal and means for accumulating the detected signal changes.
  • Additional means are provided for determining if the accumulation is above a predetermined threshold within a first time period following start-up, and for determining if the maximum value is above a predetermined reference value within a second time period following start-up.
  • on-board diagnostic system means for, if both determinations are negative, repeating the determinations for a respective third and fourth time period following start-up, which third and fourth time period are longer than the corresponding first and second time periods, and means for, if at least one of the repeated determinations are positive, indicating a functioning sensor having a malfunctioning sensor heater and if both additional determinations are negative, indicating a malfunctioning sensor.
  • a positive determination will indicate that the sensor is responding although after a longer time period as heating thereof without a functioning heater will require more time. Thus, it is hereby possible to discriminate which of sensor and heater that is malfunctioning.
  • At least one of the first, second, third and fourth time periods are respective predetermined time periods or alternatively are functions of an accumulation of an amount of an engine parameter. Examples of such accumulations that may be used for establishing the time periods are: an amount of engine revolutions; an amount of airflow; an amount of load; an amount of lambda; an amount of temperature; an amount of exhaust gas energy.
  • the third and fourth time period should be longer than the corresponding first and second time periods in order to allow a determination of a functioning sensor having a malfunctioning sensor heater, through the sensor responding after a longer time period than if properly heated.
  • an automotive vehicle which comprises an on-board diagnostic system as described above.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Claims (11)

  1. Verfahren zum rechtzeitigen Aktivieren eines in einem Abgasnachbehandlungssystem eines Fahrzeugs angeordneten beheizten binären Abgas-Sauerstoffsensors nach dem Start einer zugeordneten Brennkraftmaschine, dadurch gekennzeichnet, dass es die folgenden Schritte umfasst:
    Prüfen, ob Eintrittsbedingungen erfüllt sind;
    Erfassen von Änderungen in einem von dem Sensor ausgegebenen elektrischen Signal;
    Erfassen eines Maximalwerts des Signals;
    Akkumulieren der erfassten Signaländerungen;
    Bestimmen, ob die Akkumulation innerhalb einer ersten Zeitdauer nach dem Start über einem vorgegebenen Schwellenwert liegt;
    Bestimmen, ob der Maximalwert innerhalb einer zweiten Zeitdauer nach dem Start über einem vorgegebenen Referenzwert liegt; und
    dann, wenn wenigstens eine der Bestimmungen positiv ist, Anzeigen eines funktionierenden Sensors, und dann, wenn beide Bestimmungen negativ sind, Anzeigen eines fehlerhaften Sensors.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass es ferner die folgenden Schritte umfasst:
    wenn beide Bestimmungen negativ sind, Wiederholen der Bestimmungen für eine dritte bzw. eine vierte Zeitdauer nach dem Start; und
    dann, wenn wenigstens eine der wiederholten Bestimmungen positiv ist, Anzeigen eines funktionierenden Sensors, der eine fehlerhafte Sensorheizung besitzt, und dann, wenn beide zusätzlichen Bestimmungen negativ sind, Anzeigen eines fehlerhaften Sensors.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass die erste und/oder die zweite und/oder die dritte und/oder die vierte Zeitdauer als jeweilige vorgegebene Zeitdauern gewählt werden.
  4. Verfahren nach einem der Ansprüche 2 bis 3, dadurch gekennzeichnet, dass die erste und/oder die zweite und/oder die dritte und/oder die vierte Zeitdauer als eine Funktion einer Akkumulation eines Betrags eines Motorparameters bestimmt werden.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass es ferner den folgenden Schritt umfasst:
    im Schritt des Bestimmens, ob die Eintrittsbedingungen erfüllt sind, Ausführen wenigstens einer der folgenden Bestimmungen als eine Eintrittsbedingung, nämlich ob eine elektrische Sensorheizung mit Strom versorgt wird; die Umgebungstemperatur über einem bestimmten Pegel liegt; der umgebende Atmosphärendruck über einem bestimmten Pegel liegt; die Motordrehzahl über einem bestimmten Pegel liegt; die Kühlmitteltemperatur des Motors innerhalb eines bestimmten Bereichs liegt; die Batteriespannung über einem bestimmten Pegel liegt; die Kraftstoffzufuhr nicht unterbrochen ist.
  6. Onboard-Diagnosesystem zum Verifizieren einer rechtzeitigen Aktivierung eines in einem Abgasnachbehandlungssystems eines Fahrzeugs angeordneten beheizten binären Abgas-Sauerstoffsensors nach dem Start einer zugeordneten Brennkraftmaschine, dadurch gekennzeichnet, dass es umfasst:
    Mittel zum Prüfen, ob Eintrittsbedingungen erfüllt sind;
    Mittel zum Erfassen von Änderungen in einem von dem Sensor ausgegebenen Signal;
    Mittel zum Erfassen eines Maximalwerts des Signals;
    Mittel zum Akkumulieren der erfassten Signaländerungen;
    Mittel zum Bestimmen, ob die Akkumulation innerhalb einer ersten Zeitdauer nach dem Start über einem vorgegebenen Schwellenwert liegt;
    Mittel zum Bestimmen, ob der Maximalwert innerhalb einer zweiten Zeitdauer nach dem Start über einem vorgegebenen Referenzwert liegt; und
    Mittel, um dann, wenn wenigstens eine der Bestimmungen positiv ist, einen funktionierenden Sensor anzuzeigen, und dann, wenn beide Bestimmungen negativ sind, einen fehlerhaften Sensor anzuzeigen.
  7. Onboard-Diagnosesystem nach Anspruch 6, dadurch gekennzeichnet, dass es ferner umfasst:
    Mittel, um dann, wenn beide Bestimmungen negativ sind, die Bestimmungen für eine dritte bzw. eine vierte Zeitdauer nach dem Start zu wiederholen;
    Mittel, um dann, wenn wenigstens eine der wiederholten Bestimmungen positiv ist, einen funktionierenden Sensor mit einer fehlerhaften Sensorheizung anzuzeigen, und dann, wenn beide zusätzlichen Bestimmungen negativ sind, einen fehlerhaften Sensor anzuzeigen.
  8. Onboard-Diagnosesystem nach Anspruch 4, dadurch gekennzeichnet, dass die erste und/oder die zweite und/oder die dritte und/oder die vierte Zeitdauer jeweilige vorgegebene Zeitdauern sind.
  9. Onboard-Diagnosesystem nach einem der Ansprüche 7 bis 8, dadurch gekennzeichnet, dass die erste und/oder die zweite und/oder die dritte und/oder die vierte Zeitdauer Funktionen einer Akkumulation eines Betrags eines Motorparameters sind.
  10. Onboard-Diagnosesystem nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass es ferner umfasst:
    Mittel, die in die Mittel zum Bestimmen, ob Eintrittsbedingungen erfüllt sind, integriert sind, zum Ausführen wenigstens einer der folgenden Bestimmungen als eine Eintrittsbedingung, nämlich ob eine elektrische Sensorheizung mit Strom versorgt wird; die Umgebungstemperatur über einem bestimmten Pegel liegt; der umgebende Atmosphärendruck über einem bestimmten Pegel liegt; die Motordrehzahl über einem bestimmten Pegel liegt; die Kühlmitteltemperatur des Motors innerhalb eines bestimmten Bereichs liegt; die Batteriespannung über einem bestimmten Pegel liegt; die Kraftstoffzufuhr nicht unterbrochen ist.
  11. Kraftfahrzeug, dadurch gekennzeichnet, dass es ein Onboard-Diagnosesystem nach einem der Ansprüche 6 bis 10 enthält.
EP20070102404 2007-02-14 2007-02-14 Monitor zur Sensorenaktivierung Active EP1959121B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP20070102404 EP1959121B1 (de) 2007-02-14 2007-02-14 Monitor zur Sensorenaktivierung
DE200760002050 DE602007002050D1 (de) 2007-02-14 2007-02-14 Monitor zur Sensorenaktivierung
CN 200810008232 CN101245739B (zh) 2007-02-14 2008-02-14 传感器激活监控

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20070102404 EP1959121B1 (de) 2007-02-14 2007-02-14 Monitor zur Sensorenaktivierung

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EP1959121A1 EP1959121A1 (de) 2008-08-20
EP1959121B1 true EP1959121B1 (de) 2009-08-19

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101598073A (zh) * 2009-07-10 2009-12-09 奇瑞汽车股份有限公司 一种油轨压力信号的采集及监测方法
DE102012013781B4 (de) * 2012-07-11 2017-12-28 Volkswagen Aktiengesellschaft Verfahren und Vorrichtung zur Qualifizierung eines Sensormesssignals
CN106198622B (zh) * 2016-08-15 2018-11-13 潍柴西港新能源动力有限公司 一种氧传感器露点检测装置及检测方法
DE102018222771A1 (de) * 2018-12-21 2020-06-25 Robert Bosch Gmbh Verfahren zum Betreiben einer Sensoreinrichtung zur Detektion von Partikeln oder Aerosol, sowie Sensoreinrichtung

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2564510B2 (ja) * 1985-12-25 1996-12-18 本田技研工業株式会社 内燃エンジンの排気ガス濃度センサの異常検出方法
DE3840148A1 (de) * 1988-11-29 1990-05-31 Bosch Gmbh Robert Verfahren und vorrichtung zum erkennen eines fehlerzustandes einer lambdasonde
DE59304054D1 (de) * 1993-05-14 1996-11-07 Siemens Ag Verfahren zur Unterscheidung der Fehlerursachen im Gemischbildungs- bzw. Gemischregelungssystem einer Brennkraftmaschine
US5781878A (en) * 1995-06-05 1998-07-14 Nippondenso Co., Ltd. Apparatus and method for diagnosing degradation or malfunction of oxygen sensor
JP3048531B2 (ja) * 1996-12-12 2000-06-05 株式会社ゼクセル 燃料噴射装置におけるセンサ故障診断方法及び燃料噴射装置におけるセンサ故障診断装置
US5801295A (en) 1997-05-27 1998-09-01 Ford Global Technologies, Inc. On-board diagnostic test of oxygen sensor
DE19729696C2 (de) * 1997-07-11 2002-02-21 Bosch Gmbh Robert Verfahren und Vorrichtung zur Funktionsüberwachung einer Gas-Sonde
JP4459566B2 (ja) * 2003-07-10 2010-04-28 本田技研工業株式会社 排気ガスセンサの劣化故障診断装置
US6957562B2 (en) * 2003-07-22 2005-10-25 General Motors Corporation Passive oxygen sensor diagnostic

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Publication number Publication date
CN101245739B (zh) 2013-05-08
CN101245739A (zh) 2008-08-20
EP1959121A1 (de) 2008-08-20
DE602007002050D1 (de) 2009-10-01

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