DE102010038334A1 - Method for diagnosing nitrogen oxide sensor in exhaust gas passage of internal combustion engine of motor car in workshop, involves washing nitrogen oxide sensor with air, and comparing output signal of sensor with reference value - Google Patents
Method for diagnosing nitrogen oxide sensor in exhaust gas passage of internal combustion engine of motor car in workshop, involves washing nitrogen oxide sensor with air, and comparing output signal of sensor with reference value Download PDFInfo
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- DE102010038334A1 DE102010038334A1 DE201010038334 DE102010038334A DE102010038334A1 DE 102010038334 A1 DE102010038334 A1 DE 102010038334A1 DE 201010038334 DE201010038334 DE 201010038334 DE 102010038334 A DE102010038334 A DE 102010038334A DE 102010038334 A1 DE102010038334 A1 DE 102010038334A1
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- Prior art keywords
- nitrogen oxide
- combustion engine
- oxide sensor
- sensor
- internal combustion
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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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
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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
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/12—Introducing corrections for particular operating conditions for deceleration
- F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
-
- 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
- F02D41/146—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 NOx content or 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
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/146—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 NOx content or concentration
- F02D41/1461—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 NOx content or concentration of the exhaust gases emitted by the engine
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
Stand der TechnikState of the art
Die Erfindung betrifft ein Verfahren zur Diagnose eines Stickoxid-Sensors im Abgastrakt einer BrennkraftmaschineThe invention relates to a method for the diagnosis of a nitrogen oxide sensor in the exhaust gas tract of an internal combustion engine
Marktübliche Stickoxid-Sensoren unterliegen bekanntermaßen einer Alterung und einer Drift. Das bedeutet, dass sich die Sensorkennlinie durch Temperatur und Konzentrationseinflüsse im Laufe der Betriebszeit verändert.Customary nitrogen oxide sensors are known to be subject to aging and drift. This means that the sensor characteristic changes due to temperature and concentration influences during the operating time.
Die Druckschrift
Es sind Stickoxid-Sensoren bekannt, die über eine sogenannte On-Bord-Diagnose verfügen. Die On-Board-Diagnose umfasst unter anderem eine interne Diagnosefunktion für die Fehlererkennung, die sogenannte Eigendiagnose. Hierbei werden während des Normalbetriebs der Brennkraftmaschine ständig die Reaktionen des Systems mit den Befehlen eines Steuergerätes verglichen, sowie die Signale der verschiedenen Sensoren auf ihre Plausibilität überprüft. Unter anderem wird nach dem Abstellen der Brennkraftmaschine in dem sogenannten Nachlauf, ohne Einspritzung von Kraftstoff, oder im Schubbetrieb eine Eigendiagnose des Stickoxid-Sensors vorgenommen. Dabei wird angenommen, dass in diesem definierten Betriebspunkt eine definierte Stickoxid-Konzentration im Abgas vorliegt, so dass eine Plausibilisierung des Stickoxid-Sensors, bei der die Ausgangsignale des Sensors mit vorgegebenen Grenzwerten verglichen werden, erfolgen kann.There are known nitrogen oxide sensors, which have a so-called on-board diagnosis. The on-board diagnostics include, among other things, an internal diagnostic function for error detection, the so-called self-diagnosis. During normal operation of the internal combustion engine, the reactions of the system with the commands of a control unit are constantly compared, and the plausibility of the signals of the various sensors is checked. Among other things, after stopping the engine in the so-called caster, without injection of fuel, or in overrun a self-diagnosis of the nitrogen oxide sensor is made. It is assumed that a defined nitrogen oxide concentration in the exhaust gas is present at this defined operating point, so that a plausibility check of the nitrogen oxide sensor, in which the output signals of the sensor are compared with predetermined limit values, can take place.
Allerdings ist nach Abstellen des Motors die Stickoxid-Konzentration im Abgas noch deutlich von einer Null-Konzentration entfernt und die Plausibilisierung ist somit nur näherungsweise möglich.However, after stopping the engine, the nitrogen oxide concentration in the exhaust gas is still significantly removed from a zero concentration and the plausibility is thus only approximately possible.
Offenbarung der ErfindungDisclosure of the invention
Um eine verbesserte Plausibilisierung der Ausgangssignale des Stickoxid-Sensors zu erreichen, wird vorgeschlagen, dass der Stickoxid-Sensor zuvor Luft umspült wird und anschließend ein Vergleich der Ausgangssignale des Stickoxid-Sensors mit vorgebbaren Referenzwerten erfolgt.In order to achieve an improved plausibility of the output signals of the nitrogen oxide sensor, it is proposed that the nitrogen oxide sensor be pre-circulated air and then a comparison of the output signals of the nitrogen oxide sensor with predetermined reference values.
Durch das erfindungsgemäße Verfahren wird die Möglichkeit geschaffen, die Stickoxidkonzentration im Abgasstrom nach Abstellen der Brennkraftmaschine auf das Niveau der Umgebungsluft abzusenken. Das erfolgt dadurch, dass der Sensor mit angesaugter Umgebungsluft gespült wird. Dadurch wird eine Plausibilisierung des Stickoxid-Sensors verbessert.By means of the method according to the invention, the possibility is created of lowering the nitrogen oxide concentration in the exhaust gas stream to the level of the ambient air after the internal combustion engine has been switched off. This is done by flushing the sensor with sucked ambient air. This improves the plausibility of the nitrogen oxide sensor.
Erfindungsgemäß wird die Tatsache genutzt, dass die Luft durch eine Kolbenbewegung der Brennkraftmaschine gefördert wird. Dadurch wird ein kostenintensiver apparativer Aufwand vermieden.According to the invention, the fact is used that the air is conveyed by a piston movement of the internal combustion engine. As a result, a costly expenditure on equipment is avoided.
In einer besonders zweckmäßigen Ausgestaltung der Erfindung ist vorgesehen, dass die Kolbenbewegung durch einen Kompressionstest der Brennkraftmaschine erfolgt. Wenn sich das Fahrzeug in der Werkstatt befindet, wird dazu von einem Diagnosegerät ein Kompressionstest eingeleitet. Im Kompressionstest wird die Brennkraftmaschine im Starterbetrieb ohne eine Einspritzung von Kraftstoff und mit großer Luftzufuhr betrieben. Dadurch wird die Diagnosequalität der Stickoxid-Sensoren im Abgastrakt verbessert und der Stickoxid-Sensor wird für weitere Werkstattdiagnoseansätze nutzbar.In a particularly advantageous embodiment of the invention, it is provided that the piston movement takes place by a compression test of the internal combustion engine. When the vehicle is in the workshop, a diagnostic tester initiates a compression test. In the compression test, the internal combustion engine is operated in starter mode without an injection of fuel and with a large air supply. As a result, the diagnostic quality of the nitrogen oxide sensors in the exhaust system is improved and the nitrogen oxide sensor can be used for further workshop diagnostic approaches.
Eine weitere vorteilhafte Ausgestaltung sieht vor, dass die Kolbenbewegung durch eine Betätigung eines Anlassers bei abgeschalteter Einspritzung erfolgt. Auf diese Weise kann mit dem erfindungsgemäßen Verfahren eine Plausibilisierung des Stickoxid-Sensors vor Start der Brennkraftmaschine vorgenommen werden.A further advantageous embodiment provides that the piston movement takes place by an actuation of a starter when the injection is switched off. In this way, with the method according to the invention a plausibility of the nitrogen oxide sensor can be made before the start of the internal combustion engine.
Alternativ wird vorgeschlagen, dass die Kolbenbewegung durch einen Schubbetrieb der Brennkraftmaschine erfolgt. Während des Schubbetriebs der Brennkraftmaschine ist ebenfalls die Kraftstoffeinspritzung unterdrückt und durch die Kolbenbewegung wird Umgebungsluft angesaugt und in den Abgastrakt gefördert. Damit wird eine Plausibilisierung des Stickoxid-Sensors nach dem erfindungsgemäßen Verfahren während des Schubbetriebs der Brennkraftmaschine möglich.Alternatively, it is proposed that the piston movement takes place by a pushing operation of the internal combustion engine. During the pushing operation of the internal combustion engine, the fuel injection is also suppressed and by the piston movement ambient air is sucked and conveyed into the exhaust tract. Thus, a plausibility of the nitrogen oxide sensor according to the inventive method during the overrun operation of the internal combustion engine is possible.
Eine weitere zweckmäßige Ausgestaltung des erfindungsgemäßen Verfahrens sieht vor, dass ein Defekt des Sensors erkannt wird. Dazu wird das Ausgangssignal des Stickoxid-Sensors bei Plausibilisierung mit einem vorgebbaren Grenzwert verglichen. Liegt die Signalabweichung außerhalb zulässiger Grenzen, wird dies vom Steuergerät als Defekt des Sensors erfasst, der im Kraftfahrzeug angezeigt, oder über das Diagnosegerät ausgelesen wird. Damit wird durch das erfindungsgemäße Verfahren ein Defekt besser erkannt, und hohe Schadstoffkonzentrationen oder Schäden an Abgasnachbehandlungseinrichtungen werden vermieden.A further advantageous embodiment of the method according to the invention provides that a defect of the sensor is detected. For this purpose, the output signal of the nitrogen oxide sensor is compared with plausibility with a predetermined limit. If the signal deviation lies outside admissible limits, this is detected by the control unit as a defect of the sensor, which is displayed in the motor vehicle or read out via the diagnostic device. Thus, a defect is better recognized by the inventive method, and high pollutant concentrations or damage to exhaust aftertreatment devices are avoided.
Weitere Merkmale, Anwendungsmöglichkeiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen der Erfindung, die in den Figuren der Zeichnung dargestellt sind. Dabei bilden alle beschriebenen oder dargestellten Merkmale für sich oder in beliebiger Kombination den Gegenstand der Erfindung, unabhängig von ihrer Zusammenfassung in den Patentansprüchen oder deren Rückbeziehung sowie unabhängig von ihrer Formulierung bzw. Darstellung in der Beschreibung bzw. in der Zeichnung.]Other features, applications and advantages of the invention will become apparent from the following description of embodiments of the invention, in the figures of Drawing are shown. All described or illustrated features, alone or in any combination form the subject of the invention, regardless of their combination in the claims or their dependency and regardless of their formulation or representation in the description or in the drawing.]
Kurze Beschreibung der ZeichnungShort description of the drawing
Nachfolgend wird ein Ausführungsbeispiel der vorliegenden Erfindung unter Bezugnahme auf die beiliegenden Zeichnungen näher erläutert. In den Zeichnungen zeigen:Hereinafter, an embodiment of the present invention will be explained in more detail with reference to the accompanying drawings. In the drawings show:
Nachfolgend wird die Funktionsweise der Brennkraftmaschine beispielhaft anhand eines Viertakt-Ottomotors erläutert. Das erfindungsgemäße Verfahren kann jedoch für beliebige Ausführungen von Brennkraftmaschinen eingesetzt werden. Die Brennkraftmaschine arbeitet folgendermaßen: Im Ansaugtakt bewegt sich der Kolben
Der Stickoxidsensor
Eine On-Board-Diagnose arbeitet folgendermaßen: Während des Normalbetriebs der Brennkraftmaschine
In einem Werkstattbetrieb, bei definierten Betriebsbedingungen, wird durch das Diagnosegerät
In
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 19810973 A1 [0003] DE 19810973 A1 [0003]
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE201010038334 DE102010038334A1 (en) | 2010-07-23 | 2010-07-23 | Method for diagnosing nitrogen oxide sensor in exhaust gas passage of internal combustion engine of motor car in workshop, involves washing nitrogen oxide sensor with air, and comparing output signal of sensor with reference value |
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DE201010038334 DE102010038334A1 (en) | 2010-07-23 | 2010-07-23 | Method for diagnosing nitrogen oxide sensor in exhaust gas passage of internal combustion engine of motor car in workshop, involves washing nitrogen oxide sensor with air, and comparing output signal of sensor with reference value |
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DE102010038334A1 true DE102010038334A1 (en) | 2012-01-26 |
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DE201010038334 Withdrawn DE102010038334A1 (en) | 2010-07-23 | 2010-07-23 | Method for diagnosing nitrogen oxide sensor in exhaust gas passage of internal combustion engine of motor car in workshop, involves washing nitrogen oxide sensor with air, and comparing output signal of sensor with reference value |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9109480B2 (en) | 2012-11-29 | 2015-08-18 | GM Global Technology Operations LLC | Method and system for initiating an engine after-run state and controlling a nitrogen oxide sensor self-diagnostic tool |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19810973A1 (en) | 1998-03-13 | 1999-09-30 | Fev Motorentech Gmbh | Method for stabilizing the zero point of an exhaust gas sensor and arrangement for carrying out the method |
-
2010
- 2010-07-23 DE DE201010038334 patent/DE102010038334A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19810973A1 (en) | 1998-03-13 | 1999-09-30 | Fev Motorentech Gmbh | Method for stabilizing the zero point of an exhaust gas sensor and arrangement for carrying out the method |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9109480B2 (en) | 2012-11-29 | 2015-08-18 | GM Global Technology Operations LLC | Method and system for initiating an engine after-run state and controlling a nitrogen oxide sensor self-diagnostic tool |
DE102013224014B4 (en) | 2012-11-29 | 2019-06-27 | GM Global Technology Operations, LLC (n.d. Ges. d. Staates Delaware) | A vehicle and method for initiating an engine wakeup condition and controlling a self-diagnostic tool for nitrogen oxide sensors |
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R005 | Application deemed withdrawn due to failure to request examination |