EP0529302B1 - Procédé et dispositif pour vérifier la capacité de fonctionnement du chauffage d'une sonde à oxygène - Google Patents

Procédé et dispositif pour vérifier la capacité de fonctionnement du chauffage d'une sonde à oxygène Download PDF

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Publication number
EP0529302B1
EP0529302B1 EP92112450A EP92112450A EP0529302B1 EP 0529302 B1 EP0529302 B1 EP 0529302B1 EP 92112450 A EP92112450 A EP 92112450A EP 92112450 A EP92112450 A EP 92112450A EP 0529302 B1 EP0529302 B1 EP 0529302B1
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EP
European Patent Office
Prior art keywords
switched
heater
sensor heater
probe
diagnostic condition
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.)
Expired - Lifetime
Application number
EP92112450A
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German (de)
English (en)
Other versions
EP0529302A1 (fr
Inventor
Robert Dipl.-Ing. Entenmann (Fh)
Alfred Dipl.-Ing. Kratt
Rudolf Dipl.-Ing. Moz (Fh)
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
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
Publication of EP0529302A1 publication Critical patent/EP0529302A1/fr
Application granted granted Critical
Publication of EP0529302B1 publication Critical patent/EP0529302B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02D41/1493—Details
    • F02D41/1494—Control of sensor heater
    • 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

Definitions

  • the method according to the invention and the device specified for carrying out this method relate to checking the functionality of a heater for an oxygen measuring probe, which is arranged in the exhaust gas duct of an internal combustion engine (BKM), including the supply lines to the heater.
  • BKM internal combustion engine
  • the oxygen content of the exhaust gas is determined with the oxygen measuring probe and the value determined in this way is fed to a control device which serves to set a predetermined air / fuel ratio.
  • the oxygen measuring probe is only ready for operation above a minimum operating temperature.
  • the regulation of the air / fuel mixture via the oxygen measuring probe is only possible when the probe has reached its operating temperature. Only then can a z. B. with a view to a low pollutant emission optimal air / fuel mixture.
  • the operating temperature of the oxygen measuring probe should be reached as soon as possible after the start of the BKM.
  • the probe is heated by the exhaust gases and is accelerated by an electric probe heater for the reasons given above.
  • the electrical probe heating is also required if e.g. B. when idling, the heating power of the exhaust gas is not sufficient to keep the probe at operating temperature, or in the case of long-lasting push operation.
  • the operational readiness of the probe heating is checked e.g. B. on the current flow detected by measuring resistor through the probe heater (DE 39 41 995 A), on the output signals of the probe (DE 26 04 160 C, DE 38 40 148 A), on the warm-up behavior of the probe (DE 39 28 709 A) or about the probe temperature, which in turn can be determined in various ways, e.g. B. from the internal resistance of the probe (DE 31 17 790 C) or with a temperature sensor (US 39 15 828 A).
  • the method according to the invention with the features according to claim 1 or the device according to claim 6 has the advantage that it can be implemented with very simple means.
  • the voltage used for diagnosis is already available without modification of a conventional probe heater. It is therefore not necessary to intervene in the wiring of the probe heater, but it must only be effected by means of suitable evaluation electronics that the supply voltage of the probe heater is measured at certain times and the measured values are processed accordingly.
  • Such an electronic circuit can be made compact and is therefore inexpensive and robust.
  • the invention relates to a method and a device for monitoring the functionality of the heating of an oxygen measuring probe. It is based on the principle that the supply voltage of the probe heater decreases when loaded with the electrical resistance of the probe heater, and the magnitude of the voltage change can be used to infer the load resistance and thus the functionality of the probe heater.
  • the results of the functional test are displayed to the driver optically and / or acoustically.
  • an entry in an error memory can be made in addition to or instead of the warning signals for later error output.
  • the presence of a diagnostic condition is waited for in the first step 10 of the flowchart before a first function test is carried out.
  • the diagnostic condition is adapted to the special circumstances. It includes, for example, the time since the engine was started, the distance traveled, the engine temperature or similar parameters. A combination of different conditions is also conceivable.
  • Step 10 follows step 12, in which it is checked whether the probe heating is switched on. If the probe heating is switched off, it is switched on in the subsequent step 14 and then in step 16 the presence of a measurement condition is awaited. In the exemplary embodiment described here, the measurement condition is met when a predetermined period of time has passed.
  • step 18 which is carried out after step 16, the supply voltage Uein is measured and stored. Step 18 is also reached if it was determined in step 12 that the probe heating is switched on. After step 18, the probe heating is switched off in step 20 and the supply voltage Uout is measured in the subsequent step 22. In the subsequent step 24, the difference between Uout and Uein is compared with a predetermined value deltaU1 and step 26 is carried out if this difference is greater than deltaU1. In step 26, the difference is used for a second comparison. It is checked whether it is less than a predetermined value deltaU2. If this is the case, a further diagnostic condition is awaited in the following step 28 and then it goes back to step 12.
  • step 30 If it is found in step 24 that the difference between Uout and Uein is not greater than a predetermined value deltaU1, then in step 30 it is concluded that the probe heating is interrupted and therefore defective. A short circuit of the heating is recognized in step 32, which is followed by step 26 if the condition checked in step 26 is not fulfilled. Both steps 30 and 32 lead to step 34, in which a corresponding entry is made in the error memory. After step 34, an alarm signal is output in step 36.
  • a functional probe heater represents a load on the supply voltage due to its electrical resistance, so that the supply voltage rises when the probe heater is switched off. If the probe heating and / or the supply lines are interrupted the supply voltage does not change due to the switching process. In step 30, a faulty probe heater (including supply lines) is concluded, an error message is entered in the error memory in step 34, and a corresponding warning signal is output in step 36 if, in steps 18 to 24, there is no voltage change by more than the specified value deltaU1 is observed.
  • step 32 If, on the other hand, the observed change in voltage is greater than deltaU1, it can be assumed that there is no interruption. However, there is still the possibility of a short circuit, which leads to a particularly high load on the supply voltage and thus to a large voltage change. If the voltage change in query 26 exceeds a predetermined maximum value deltaU2, it is concluded in step 32 that there is a short circuit. This is followed in step 34 by the entry in the error memory and in step 36 by the output of a corresponding warning signal.
  • the diagnosis of the probe heating is repeated whenever a further diagnostic condition is fulfilled in step 28.
  • This diagnostic condition can depend on the same parameters as the diagnostic condition of step 10. However, the conditions do not have to be identical and are based on the specific application and legal templates.
  • the functional test is repeated in the case of a functional and / or a probe heater identified as defective.
  • a device is expedient in which the first measurement of the supply voltage takes place with the probe heating switched off and the second measurement with the probe heating switched on. This means that a possible fault in the probe heating can be recognized after a very short operating time. This proves to be an advantage in particular in the case of a short-circuited probe heater, since the supply voltage source is not subjected to the high load then present for an unnecessarily long time.

Landscapes

  • 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)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Testing Of Engines (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)

Claims (6)

  1. Procédé pour surveiller l'aptitude au fonctionnement du chauffage d'une sonde de mesure à oxygène, placée dans le canal des gaz d'échappement d'un moteur à combustion interne, caractérisé en ce qu'on mesure la tension d'alimentation du chauffage de la sonde lorsque le chauffage est en marche et qu'il est arrêté et si la différence entre les tensions passe en dessous d'une valeur minimale prédéterminée ou dépasse une valeur maximale prédéterminée, on émet des signaux d'erreur correspondants et/ou on les enregistre dans une mémoire d'erreur.
  2. Procédé selon la revendication 1, caractérisé en ce qu'on fait de préférence la première mesure lorsque le chauffage de la sonde est branché, lorsqu'une première condition de diagnostic est satisfaite, et on effectue la seconde mesure après coupure du chauffage de la sonde.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'on répète un essai de fonctionnement en présence d'au moins une autre condition de diagnostic.
  4. Procédé selon la revendication 1 ou 3, caractérisé en ce qu'on peut choisir séparément la première condition de diagnostic et/ou l'autre condition de diagnostic et elles sont satisfaites lorsque certaines caractéristiques de fonctionnement existent.
  5. Procédé selon la revendication 4, caractérisé en ce que les caractéristiques de fonctionnement sont le temps depuis le démarrage du moteur à comoustion interne, le temps écoulé depuis le dernier diagnostic du chauffage de sonde, le chemin parcouru ou la température du moteur.
  6. Dispositif pour la mise en oeuvre du procédé selon l'une des revendications 1 à 5, avec des moyens pour reconnaître la présence d'une condition de diagnostic, caractérisé en ce que pour le chauffage de la sonde de mesure d'oxygène des moyens sont utilisés pour mesurer la tension d'alimentation du chauffage de la sonde lorsque le chauffage est branché et lorsqu'il est coupé, pour former la différence des deux valeurs, émettre des signaux d'erreur correspondants lorsque la différence entre les tensions passe en dessous d'une valeur minimale prédéterminée ou dépasse une valeur maximale prédéterminée.
EP92112450A 1991-08-27 1992-07-21 Procédé et dispositif pour vérifier la capacité de fonctionnement du chauffage d'une sonde à oxygène Expired - Lifetime EP0529302B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4128385 1991-08-27
DE4128385A DE4128385A1 (de) 1991-08-27 1991-08-27 Verfahren und vorrichtung zur ueberwachung der funktionsfaehigkeit einer sauerstoffmesssonden-heizung

Publications (2)

Publication Number Publication Date
EP0529302A1 EP0529302A1 (fr) 1993-03-03
EP0529302B1 true EP0529302B1 (fr) 1995-03-29

Family

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EP92112450A Expired - Lifetime EP0529302B1 (fr) 1991-08-27 1992-07-21 Procédé et dispositif pour vérifier la capacité de fonctionnement du chauffage d'une sonde à oxygène

Country Status (4)

Country Link
US (1) US5327780A (fr)
EP (1) EP0529302B1 (fr)
JP (1) JPH05195843A (fr)
DE (2) DE4128385A1 (fr)

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US5454259A (en) * 1993-08-02 1995-10-03 Toyota Jidosha Kabushiki Kaisha Failure detecting apparatus in temperature controller of air-fuel ratio sensor
JP3050019B2 (ja) * 1993-10-12 2000-06-05 トヨタ自動車株式会社 内燃機関の酸素センサ制御装置
DE4404152A1 (de) * 1994-02-10 1995-08-17 Braun Ag Fehlfunktions-Auswerteschaltung für elektrische Geräte
JPH07259612A (ja) * 1994-03-18 1995-10-09 Honda Motor Co Ltd 内燃エンジンの排気ガス濃度センサ異常検出装置
IT1285863B1 (it) * 1996-05-08 1998-06-24 Magneti Marelli Spa Circuito di controllo per un riscaldatore a resistenza variabile associato ad un sensore di ossigeno nei gas di scarico.
DE19636415B4 (de) * 1996-09-07 2007-12-27 Robert Bosch Gmbh Verfahren und Vorrichtung zur Überwachung der Funktionsweise eines Kohlenwasserstoffsensors für eine Brennkraftmaschine
JP3760558B2 (ja) * 1997-04-23 2006-03-29 株式会社デンソー 酸素センサのヒータ制御装置
US6164125A (en) * 1997-04-23 2000-12-26 Denso Corporation Detection of malfunction in gas concentration detection system
DE19953142A1 (de) * 1999-09-14 2001-03-15 Emitec Emissionstechnologie Mantelleiteranordnung für korrosive Umgebungsbedingungen und Verfahren zur Herstellung einer Mantelleiteranordnung
DE10056320A1 (de) * 2000-11-14 2002-05-16 Volkswagen Ag Verfahren und Vorrichtung zur Endstufendiagnose
FR2910932A1 (fr) * 2006-12-27 2008-07-04 Renault Sas Procede de controle d'elements electriques d'un moteur.
DE102009001351A1 (de) * 2009-03-05 2010-09-09 Robert Bosch Gmbh Verfahren und Vorrichtung zur Erkennung einer Unterbrechung in einer elektrischen Zuleitung
DE102009002037A1 (de) * 2009-03-31 2010-10-07 Robert Bosch Gmbh Verfahren zum Betreiben eines Sensors
DE102010002458A1 (de) * 2009-09-11 2011-03-24 Robert Bosch Gmbh Abgassonde
EP2781927A1 (fr) * 2013-03-19 2014-09-24 Delphi Technologies Holding S.à.r.l. Procédé et appareil pour détecter une fonctionnalité de dispositif
JP6214975B2 (ja) 2013-09-10 2017-10-18 日本特殊陶業株式会社 負荷駆動装置及びセンサ制御装置
JP6276172B2 (ja) * 2014-12-03 2018-02-07 日本特殊陶業株式会社 負荷駆動装置
CN106248414B (zh) * 2016-08-05 2018-08-21 东南大学 适用于结构健康监测的传感器布设方法及结构识别方法
CN109944671B (zh) * 2017-12-20 2020-11-13 中国航天系统工程有限公司 基于前、后氧传感器的三元催化器健康状态判断系统和方法
CN114459784B (zh) * 2021-08-30 2023-08-29 中电华创电力技术研究有限公司 汽轮机合体低压加热器憋气故障检测方法及装置
CN113847122B (zh) * 2021-09-22 2022-09-16 奇瑞汽车股份有限公司 汽车的gpf再生控制方法、装置及计算机存储介质

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JPH01224431A (ja) * 1988-03-01 1989-09-07 Mitsubishi Electric Corp 内燃機関の空燃比制御装置
IT1223822B (it) * 1988-09-14 1990-09-29 Marelli Autronica Circuito elettrico particolarmente circuito elettronico di potenza per impianti di iniezione di autoveicoli con funzione di rilevazione diagnostica del guasto e relativo procedimento
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DE3928709A1 (de) * 1989-08-30 1991-03-07 Bosch Gmbh Robert Verfahren und vorrichtung zur ueberpruefung der funktionsfaehigkeit einer abgassondenheizung und deren zuleitungssystem

Also Published As

Publication number Publication date
JPH05195843A (ja) 1993-08-03
DE4128385A1 (de) 1993-03-04
US5327780A (en) 1994-07-12
EP0529302A1 (fr) 1993-03-03
DE59201767D1 (de) 1995-05-04

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