EP1581734A1 - Method and device for diagnosing the dynamic characteristics of a lambda probe, used for the lambda regulation of individual cylinders - Google Patents

Method and device for diagnosing the dynamic characteristics of a lambda probe, used for the lambda regulation of individual cylinders

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Publication number
EP1581734A1
EP1581734A1 EP03799439A EP03799439A EP1581734A1 EP 1581734 A1 EP1581734 A1 EP 1581734A1 EP 03799439 A EP03799439 A EP 03799439A EP 03799439 A EP03799439 A EP 03799439A EP 1581734 A1 EP1581734 A1 EP 1581734A1
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EP
European Patent Office
Prior art keywords
lambda
cylinder
value
controllers
detuning
Prior art date
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Application number
EP03799439A
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German (de)
French (fr)
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EP1581734B1 (en
Inventor
Andreas Koring
Ruediger Deibert
Michael Daetz
Eberhard Schnaibel
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Robert Bosch GmbH
Volkswagen AG
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Robert Bosch GmbH
Volkswagen AG
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Publication of EP1581734A1 publication Critical patent/EP1581734A1/en
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Publication of EP1581734B1 publication Critical patent/EP1581734B1/en
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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
    • F02D41/008—Controlling each cylinder individually
    • 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 invention relates to a method and a device for diagnosing the dynamic properties of lambda probes with regard to a single-cylinder lambda control according to the preambles of the respective independent claims.
  • Lambda control in conjunction with a catalytic converter is the most effective exhaust gas purification process for the gasoline engine today. Only in combination with currently available ignition and injection systems can very low Emission values can be achieved. In most countries, legislators even prescribe limit values for engine exhaust.
  • lambda control the respective exhaust gas is always measured and the quantity of fuel supplied is corrected immediately in accordance with the measurement result, for example using the injection system.
  • the sum of the lambda signal can be used to infer the lambda of the individual engine cylinders, the exhaust gas of which is fed to the installation location of the probe. This makes it possible to correct cylinder-specific La bda differences and thus improve the exhaust gas result, or at least the exhaust gas stability.
  • the dynamic properties of a lambda probe when new are usually sufficient in a selected operating range.
  • the dynamic properties of the probe change in such a way that cylinder-specific lambda values cannot be resolved, since the response times of the probe increase, the lambda control does not intervene, although lambda fluctuations actually exist in the exhaust gas.
  • causes of reduced probe dynamics are, for example. Narrowing of the protective tube openings of the probe or the contamination of function-determining sensor ceramic parts of the solid electrolyte due to deposits. In the case of broadband probes, contamination of the diffusion barrier there is also an option.
  • a non-functioning single cylinder lambda control leads to the violation of the exhaust gas limit values specified by the legislator.
  • the changed dynamic properties of the lambda probe must be displayed, for example, by means of a control lamp.
  • the present invention is therefore based on the object of specifying a method and a device of the type mentioned at the outset which permit reliable diagnosis of the dynamic properties of a lambda sensor with regard to single-cylinder lambda control.
  • the method according to the invention provides, in particular, for detecting at least one manipulated variable of the lambda control and comparing it with a predeterminable maximum threshold and, if the maximum threshold is exceeded, the dynamic behavior of the lambda sensor in With regard to the usability for the cylinder-specific lambda control to be assessed as insufficient.
  • the dynamic properties of the lambda probe are recorded by means of the individual cylinder control itself. It is based on the idea that the mode of operation of individual cylinder-specific controllers diverges if the dynamic properties are insufficient and that the associated manipulated variables, namely one or more manipulated variables, exceed a predeterminable maximum threshold value.
  • the dynamic behavior of the lambda probe is determined by means of a test function, i.e. by means of an initiated disturbance or detuning of the current lambda value.
  • the test function can be carried out once, temporarily, periodically or event-controlled.
  • the predeterminable maximum threshold for a cylinder-specific controller can be exceeded, for example, when the controller is active and the value of the respective manipulated variable exceeds the predeterminable amount or the manipulated variable can no longer be increased due to its structure. In this case, the dynamic properties of the lambda sensor with regard to the usability for the Single cylinder load control considered insufficient.
  • the invention further relates to a diagnostic device which works according to the method according to the invention.
  • the diagnostic routine described below with reference to the figure for recognizing the operational capability or non-operational capability of a lambda sensor of a gasoline engine is preferably carried out only during the time in which a single-cylinder control having individual controllers is active.
  • the test function described below is carried out once or several times and the results of the tests are only evaluated as long as the test function is active.
  • step 30 it is determined in step 30 whether the engine is moving is at all in an operating state suitable for single-cylinder control and thus for the detection of the dynamic properties of the lambda sensor. If this is not the case, a loop is returned to the beginning of the routine. Otherwise, the manipulated variables of the individual controllers are monitored 40 and, after the manipulated variables have been recorded, it is further checked 50 whether at least one of the manipulated variables exceeds a predeterminable maximum threshold. If this is not the case, the process jumps back to step 40, possibly including a delay stage 60.
  • a next step 70 it is checked whether there is a suitable time for activating the test function. If the answer is in the negative, this test 70 is repeated in a loop, also possibly including a delay stage.
  • test routine begins with the current values of the manipulated variables of the individual controllers being buffered 80. Then there is a fault on the currently determined lambda values switched on 90 and observes or records 100 the manipulated variables of the individual rules].
  • the procedure or routine described above may be carried out several times in order to be able to optimize the manipulated variables, so to speak, iteratively 'or step by step.
  • the dynamic properties of the lambda probe in relation to the single cylinder control are accordingly determined with the help of the controller function itself and / or the described active test function.
  • the lambda of a cylinder is targeted by varying the cylinder-specific fuel measurement by a previously defined amount x tune.
  • this cylinder trimming must be represented as an additional offset with approximately the same amount as the trimming in the associated cylinder-specific manipulated variable of the single-cylinder control. If the resulting manipulated variable change is only a portion y of the stimulated cylinder trim, this means that the lambda probe can no longer fully follow the cylinder-specific fluctuations due to reduced dynamics. If the component y falls below a predefinable threshold z, ie a residual error x - z relevant to exhaust gas can no longer be corrected, an error signal must be output. The resulting exhaust gas disadvantage is not relevant in this case.
  • the invention can be implemented either as hardware or in the form of a control program as part of the engine control.

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

Abstract

The invention relates to a method for diagnosing the dynamic characteristics of a lambda probe, used at least occasionally for the lambda regulation of individual cylinders. Said method is characterised in that at least one control variable for lambda regulation is detected and compared with a predefinable maximum threshold and if said threshold is exceeded the dynamic behaviour of the lambda probe is rated as unsatisfactory in terms of its operational integrity for the lambda regulation of individual cylinders.

Description

Verfahren und Vorrichtung zur Diagnose der dynamischen Eigenschaften einer zur zylinderindividuellen Lambdaregelung verwendeten LambdasondeMethod and device for diagnosing the dynamic properties of a lambda probe used for cylinder-specific lambda control
Beschreibungdescription
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Diagnose der dynamischen Eigenschaften von Lambdasonden im Hinblick auf eine Einzelzylinder- Lambdaregelung gemäß den Oberbegriffen der jeweiligen unabhängigen Ansprüche.The invention relates to a method and a device for diagnosing the dynamic properties of lambda probes with regard to a single-cylinder lambda control according to the preambles of the respective independent claims.
Eine Lambdaregelung, in Verbindung mit einem Katalysator, ist heute das wirksamste Abgasreinigungsverfahren für den Ottomotor. Erst im Zusammenspiel mit derzeit verfügbaren Zünd- und Einspritzsystemen können sehr niedrige Abgaswerte erreicht werden. In den meisten Ländern schreibt der Gesetzgeber sogar Grenzwerte für das Motorabgas vor.Lambda control in conjunction with a catalytic converter is the most effective exhaust gas purification process for the gasoline engine today. Only in combination with currently available ignition and injection systems can very low Emission values can be achieved. In most countries, legislators even prescribe limit values for engine exhaust.
Besonders wirkungsvoll ist der Einsatz eines Dreiwegeoder Selektiv-Katalysators. Dieser Katalysatortyp hat die Eigenschaft, Kohlenwasserstoffe, Kohlenmonoxid und Stickoxide bis zu mehr als 98% abzubauen, falls der Motor in einem Bereich von etwa 1% um das stöchiometrische Luft-Kraftstoff-Verhältnis mit Lambda = 1 betrieben wird. Dabei gibt Lambda an, wieweit das tatsächliche vorhandene Luft-Kraftstoff-Gemisch von dem Wert Lambda = 1 abweicht, der einem zur vollständigen Verbrennung theoretisch notwendigen Massenverhältnis von 14,7 kg Luft zu 1 kg Benzin entspricht, d.h. Lambda ist der Quotient aus zugeführter Luftmasse und theoretischem Luftbedarf.The use of a three-way or selective catalyst is particularly effective. This type of catalytic converter has the property of reducing hydrocarbons, carbon monoxide and nitrogen oxides by up to more than 98% if the engine is operated in a range of approximately 1% around the stoichiometric air-fuel ratio with lambda = 1. Lambda indicates the extent to which the actual air-fuel mixture deviates from the value Lambda = 1, which corresponds to a mass ratio of 14.7 kg air to 1 kg gasoline, which is theoretically necessary for complete combustion, i.e. Lambda is the quotient of the air mass supplied and the theoretical air requirement.
Bei der Lambdaregelung wird grundsätzlich das jeweilige Abgas gemessen und die zugeführte Kraftstoffmenge entsprechend dem Messergebnis bspw. mittels des Einspritzsystems sofort korrigiert. Als Messfühler wird dabei eine Lambdasonde verwendet, die ein stetiges Lambdasignal um Lambda = 1 messen kann und so ein Signal liefert, das anzeigt, ob das Gemisch fetter oder magerer als Lambda = 1 ist.In the case of lambda control, the respective exhaust gas is always measured and the quantity of fuel supplied is corrected immediately in accordance with the measurement result, for example using the injection system. A lambda probe is used as the measuring sensor, which can measure a steady lambda signal around lambda = 1 and thus delivers a signal that indicates whether the mixture is richer or leaner than lambda = 1.
Die Wirkung dieser Lambdasonden beruht in an sich bekannter Weise auf dem Prinzip einer galvanischen Sauerstoff-Konzentrationszelle mit einem Festkörperelektrolyt.The effect of these lambda probes is based on the principle of a galvanic in a manner known per se Oxygen concentration cell with a solid electrolyte.
Es ist weiterhin bekannt, eine Einzelzylinder- Lambdaregelung zur Abgasverbesserung einzusetzen, falls die Lambdasonde aufgrund ihrer dynamischen Eigenschaften in der Lage ist, Lambdaschwankungen im Abgasstrom am Sondeneinbauort, welche durch zylinderindividuelle La bdaunterschiede hervorgerufen werden, zu folgen.It is also known to use a single-cylinder lambda control for improving the exhaust gas if the lambda probe is able due to its dynamic properties to follow lambda fluctuations in the exhaust gas flow at the probe installation location, which are caused by cylinder-specific load differences.
Durch zeitlich hochauflösende Auswertung des von der Lambdasonde stammenden Signals kann aus dem Summen- Lambdasignal auf das Lambda der einzelnen Motorzylinder, deren Abgas dem Einbauort der Sonde zugeführt wird, geschlossen werden. Damit können zylinderindividuelle La bda-Unterschiede korrigiert und somit das Abgasergebnis, zumindest jedoch die Abgasstabilität, verbessert werden.By evaluating the signal from the lambda probe with high resolution over time, the sum of the lambda signal can be used to infer the lambda of the individual engine cylinders, the exhaust gas of which is fed to the installation location of the probe. This makes it possible to correct cylinder-specific La bda differences and thus improve the exhaust gas result, or at least the exhaust gas stability.
Die dynamischen Eigenschaften einer Lambdasonde im Neuzustand sind in einem ausgewählten Betriebsbereich meist ausreichend. Verändern sich jedoch die dynamischen Eigenschaften der Sonde dahingehend, dass zylinderindividuelle Lambdawerte nicht aufgelöst werden können, da die Reaktionszeiten der Sonde sich erhöhen, wird die Lambdaregelung nicht eingreifend tätig, obwohl im Abgas tatsächlich Lambdaschwankungen vorliegen. Ursachen einer reduzierten Sondendynamik sind bspw. Verengungen von Schutzrohröffnungen der Sonde oder die Verschmutzung von funktionsbestimmenden Sensorkeramikteilen des Festkörperelektrolyten aufgrund von Ablagerungen. Bei Breitbandsonden kommt zusätzlich eine Verschmutzung der dort vorhandenen Diffusionsbarriere in Betracht. Im ungünstigsten Fall führt eine nicht funktionierende Einzelzylinder- Lambdaregelung zur Verletzung der genannten, durch den Gesetzgeber geforderten Abgasgrenzwerte. In diesem Fall müssen die veränderten dynamischen Eigenschaften der Lambdasonde bspw. mittels einer Kontrollleuchte angezeigt werden.The dynamic properties of a lambda probe when new are usually sufficient in a selected operating range. However, if the dynamic properties of the probe change in such a way that cylinder-specific lambda values cannot be resolved, since the response times of the probe increase, the lambda control does not intervene, although lambda fluctuations actually exist in the exhaust gas. Causes of reduced probe dynamics are, for example. Narrowing of the protective tube openings of the probe or the contamination of function-determining sensor ceramic parts of the solid electrolyte due to deposits. In the case of broadband probes, contamination of the diffusion barrier there is also an option. In the worst case, a non-functioning single cylinder lambda control leads to the violation of the exhaust gas limit values specified by the legislator. In this case, the changed dynamic properties of the lambda probe must be displayed, for example, by means of a control lamp.
Der vorliegenden Erfindung liegt deshalb die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung der eingangs genannten Art anzugeben, welche eine zuverlässige Diagnose der dynamischen Eigenschaften einer Lambdasonde im Hinblick auf Einzelzylinder-Lambdaregelung gestattet.The present invention is therefore based on the object of specifying a method and a device of the type mentioned at the outset which permit reliable diagnosis of the dynamic properties of a lambda sensor with regard to single-cylinder lambda control.
Diese Aufgabe wird bei einem Verfahren und einer Vorrichtung zur Diagnose der vorgenannten Art gelöst durch die Merkmale der jeweiligen unabhängigen Ansprüche.This object is achieved in a method and a device for diagnosis of the aforementioned type by the features of the respective independent claims.
Das erfindungsgemäße Verfahren sieht insbesondere vor, wenigstens eine Stellgröße der Lambdaregelung zu erfassen und mit einer vorgebbaren maximalen Schwelle zu vergleichen und im Falle des Überschreitens der maximalen Schwelle das dynamische Verhalten der Lambdasonde im Hinblick auf die Einsatzfahigkeit für die zylinderindividuelle Lambdaregelung als nicht ausreichend zu bewerten.The method according to the invention provides, in particular, for detecting at least one manipulated variable of the lambda control and comparing it with a predeterminable maximum threshold and, if the maximum threshold is exceeded, the dynamic behavior of the lambda sensor in With regard to the usability for the cylinder-specific lambda control to be assessed as insufficient.
Die dynamischen Eigenschaften der Lambdasonde werden in einer ersten erfindungsgemäßen Variante mittels der Einzelzylinderregelung selbst erfasst. Es liegt dabei der Gedanke zugrunde, dass die Arbeitsweise einzelner zylinderindividueller Regler bei nicht ausreichenden dynamischen Eigenschaften divergiert und die zugehörigen Stellgrößen, und zwar eine oder mehrere Stellgrößen, einen vorgebbaren maximalen Schwellwert überschreiten.In a first variant according to the invention, the dynamic properties of the lambda probe are recorded by means of the individual cylinder control itself. It is based on the idea that the mode of operation of individual cylinder-specific controllers diverges if the dynamic properties are insufficient and that the associated manipulated variables, namely one or more manipulated variables, exceed a predeterminable maximum threshold value.
In einer zweiten erfindungsgemäßen Variante wird das dynamische Verhalten der Lambdasonde mittels einer Testfunktion, d.h. mittels einer eingeleiteten Störung oder Verstimmung des aktuellen Lambdawertes, erfasst. Die Testfunktion kann einmalig, zeitweilig periodisch oder ereignisgesteuert durchgeführt werden.In a second variant according to the invention, the dynamic behavior of the lambda probe is determined by means of a test function, i.e. by means of an initiated disturbance or detuning of the current lambda value. The test function can be carried out once, temporarily, periodically or event-controlled.
Die vorgebbare maximale Schwelle für einen zylinderindividuellen Regler kann bspw. dann überschritten sein, wenn der Regler aktiv ist und der Wert der jeweiligen Stellgröße den vorgebbaren Betrag übertrifft oder die Stellgröße aufgrund ihrer Struktur überhaupt nicht mehr vergrößert werden kann. In diesem Fall werden die dynamischen Eigenschaften der Lambdasonde im Hinblick auf die Einsatzfahigkeit für die Einzelzylinder-La bdaregelung als nicht ausreichend erachtet.The predeterminable maximum threshold for a cylinder-specific controller can be exceeded, for example, when the controller is active and the value of the respective manipulated variable exceeds the predeterminable amount or the manipulated variable can no longer be increased due to its structure. In this case, the dynamic properties of the lambda sensor with regard to the usability for the Single cylinder load control considered insufficient.
Die Erfindung betrifft des Weiteren eine Diagnosevorrichtung, welche nach dem erfindungsgemäßen Verfahren arbeitet.The invention further relates to a diagnostic device which works according to the method according to the invention.
Die Erfindung wird nachfolgend, unter Bezugnahme auf die beigefügte Zeichnung, anhand eines Ausführungsbeispiels noch eingehender erläutert, aus dem sich weitere Merkmale und Vorteile der Erfindung ergeben. Die einzige Figur zeigt eine bevorzugte Ausgestaltung des erfindungsgemäßen Diagnoseverfahrens anhand eines Flussdiagramms.The invention is explained in more detail below with reference to the accompanying drawing using an exemplary embodiment from which further features and advantages of the invention result. The single figure shows a preferred embodiment of the diagnostic method according to the invention using a flow chart.
Die nachfolgend anhand der Figur beschriebene Diagnoseroutine zur Erkennung der Einsatzfahigkeit bzw. Nicht-Einsatzfähigkeit einer Lambdasonde eines Ottomotors wird bevorzugt nur während der Zeit, in welcher eine einzelne Regler aufweisende Einzelzylinderregelung aktiv ist, durchgeführt. Je nach Strategie wird dabei die nachfolgend beschriebene Testfunktion einmalig oder mehrmals ausgeführt und die Ergebnisse der Tests nur solange ausgewertet, wie die Testfunktion aktiv ist.The diagnostic routine described below with reference to the figure for recognizing the operational capability or non-operational capability of a lambda sensor of a gasoline engine is preferably carried out only during the time in which a single-cylinder control having individual controllers is active. Depending on the strategy, the test function described below is carried out once or several times and the results of the tests are only evaluated as long as the test function is active.
Nach dem Start 10 der Routine wird zunächst die Motordrehzahl und/oder die Motorlast und/oder der Abgasmassenstrom erfasst 20. Basierend auf diesen Daten wird in Schritt 30 festgestellt, ob der Motor sich überhaupt in einem für die Einzelzylinderregelung und damit für die Erkennung der dynamischen Eigenschaften der Lambdasonde geeigneten Betriebszustand befindet. Ist dies nicht der Fall, wird in Form einer Schleife wieder an den Anfang der Routine zurückgesprungen. Andernfalls werden die Stellgrößen der einzelnen Regler überwacht 40 und nach Erfassen der Stellgrößen wird weiterhin geprüft 50, ob wenigstens eine der Stellgrößen im Betrag eine vorgebbare Maximalschwelle überschreitet. Ist dies nicht der Fall, wird wieder zu Schritt 40 zurückgesprungen, ggf. unter Einbeziehung einer Verzögerungsstufe 60.After the start 10 of the routine, the engine speed and / or the engine load and / or the exhaust gas mass flow is first recorded 20. Based on this data, it is determined in step 30 whether the engine is moving is at all in an operating state suitable for single-cylinder control and thus for the detection of the dynamic properties of the lambda sensor. If this is not the case, a loop is returned to the beginning of the routine. Otherwise, the manipulated variables of the individual controllers are monitored 40 and, after the manipulated variables have been recorded, it is further checked 50 whether at least one of the manipulated variables exceeds a predeterminable maximum threshold. If this is not the case, the process jumps back to step 40, possibly including a delay stage 60.
Falls eine oder mehrere Stellgrößen der einzelnen Regler eine vorgebbare maximale Schwelle betragsmäßig überschreiten, wird angenommen, dass die dynamischen Eigenschaften der Lambdasonde nicht ausreichend sind.If one or more manipulated variables of the individual controllers exceed a predefinable maximum threshold, it is assumed that the dynamic properties of the lambda sensor are not sufficient.
In einem nächsten Schritt 70 wird geprüft, ob ein geeigneter Zeitpunkt zur Aktivierung der Testfunktion vorliegt. Ist dies zu verneinen, wird diese Prüfung 70 in einer Schleife wiederholt, ebenfalls ggf. unter Einbeziehung einer Verzögerungsstufe.In a next step 70 it is checked whether there is a suitable time for activating the test function. If the answer is in the negative, this test 70 is repeated in a loop, also possibly including a delay stage.
Andernfalls beginnt die Testroutine damit, dass die aktuell vorliegenden Werte der Stellgrößen der einzelnen Regler zwischengespeichert 80 werden. Danach wird auf die aktuell ermittelten Lambdawerte eine Störung aufgeschaltet 90 und die Stellgrößen der einzelnen Regle] beobachtet bzw. erfasst 100.Otherwise, the test routine begins with the current values of the manipulated variables of the individual controllers being buffered 80. Then there is a fault on the currently determined lambda values switched on 90 and observes or records 100 the manipulated variables of the individual rules].
Im Anschluss daran wird geprüft 110, ob der Regler bzw. die Regler in der Lage ist/sind, die Störung auszuregeln. Ist dies der Fall, wird ggf. ein positives Signal ausgegeben 120, wonach die Dynamik der Sonde ausreichend ist. Andernfalls wird angenommen, dass die dynamischen Anforderungen nicht erfüllt sind und ein entsprechendes negatives Signal ausgegeben 130.Subsequently, it is checked 110 whether the controller or controllers is / are able to correct the fault. If this is the case, a positive signal is possibly output 120, after which the dynamics of the probe are sufficient. Otherwise, it is assumed that the dynamic requirements are not met and a corresponding negative signal is issued 130.
Abschließend wird die Störung zurückgenommen 140 und es erfolgt eine Neuinitialisierung 150 der einzelnen Regler mit den zwischengespeicherten Werten. Daraufhin wird wiederum eine Störung aufgeschaltet, wie durch den Rücksprung 160 angedeutet ist.Finally, the fault is withdrawn 140 and the individual controllers 150 are reinitialized with the temporarily stored values. A fault is then in turn applied, as is indicated by the return 160.
Die vorbeschriebene Prozedur oder Routine wird ggf. mehrfach durchgeführt, um die Stellgrößen sozusagen , iterativ' oder schrittweise optimieren zu können.The procedure or routine described above may be carried out several times in order to be able to optimize the manipulated variables, so to speak, iteratively 'or step by step.
Die dynamischen Eigenschaften der Lambdasonde in Bezug auf die Einzelzylinderregelung werden demnach mit Hilfe der Reglerfunktion selbst und/oder der beschriebenen aktiven Testfunktion ermittelt. In einer geeigneten Fahrsituation wird gezielt das Lambda eines Zylinders durch Variation der zylinderindividuellen Kraftstoffmessung um einen vorher definierten Betrag x verstimmt. Bei aktiver Einzelzylinder-Regelung uss sich diese Zylindervertrimmung als zusätzlicher Offset mit etwa dem gleichen Betrag wie die Vertrimmung in der dazugehörigen zylinderindividuellen Stellgröße der Einzelzylinderregelung abbilden. Beträgt die resultierende Stellgrößenänderung nur einen Anteil y der stimulierten Zylindervertrimmung, bedeutet dies, dass die Lambdasonde aufgrund einer reduzierten Dynamik den zylinderindividuellen Schwankungen nicht mehr in vollem Umfang folgen kann. Unterschreitet der Anteil y eine vorgebbare Schwelle z, d.h. ein abgasrelevanter Restfehler x - z kann nicht mehr ausgeregelt werden, muss ein Fehlersignal ausgegeben werden. Der entstehende Abgasnachteil ist in diesem Fall nicht von Belang.The dynamic properties of the lambda probe in relation to the single cylinder control are accordingly determined with the help of the controller function itself and / or the described active test function. In a suitable driving situation, the lambda of a cylinder is targeted by varying the cylinder-specific fuel measurement by a previously defined amount x tune. When single-cylinder control is active, this cylinder trimming must be represented as an additional offset with approximately the same amount as the trimming in the associated cylinder-specific manipulated variable of the single-cylinder control. If the resulting manipulated variable change is only a portion y of the stimulated cylinder trim, this means that the lambda probe can no longer fully follow the cylinder-specific fluctuations due to reduced dynamics. If the component y falls below a predefinable threshold z, ie a residual error x - z relevant to exhaust gas can no longer be corrected, an error signal must be output. The resulting exhaust gas disadvantage is not relevant in this case.
Im Falle einer Gutprüfung, d.h. die Sondendynamik für Einzelzylinder-Lambdaregelung wird als ausreichend erachtet, da die Vertrimmung wird vollständig oder nahezu vollständig ausgeregelt wird, entsteht durch die beschriebene Testfunktion kein Abgasnachteil. Zudem erfolgt nach Abschluss einer Prüfung, wie vorbeschrieben, eine Zurücksetzung der Zylindervertrimmung in den Ausgangszustand.In the case of a good check, i.e. the probe dynamics for single-cylinder lambda control is considered sufficient, since the trim is completely or almost completely corrected, the test function described does not result in any exhaust gas disadvantage. In addition, after completion of an inspection, as described above, the cylinder trim is reset to the initial state.
Es ist anzumerken, dass eine etwa erfasste Änderung der dynamischen Eigenschaften der Lambdasonde für die übrigen Funktionen der Motorsteuerung, die das Lambdasondensignal auswerten, nicht von Relevanz ist und diese daher getrennt zu überwachen sind.It should be noted that an approximately detected change in the dynamic properties of the lambda probe for the other functions of the engine control system, the lambda probe signal evaluate, is not relevant and must therefore be monitored separately.
Die Erfindung kann entweder als Hardware oder in Form eines Steuerprogramms als Teil der Motorsteuerung implementiert werden. The invention can be implemented either as hardware or in the form of a control program as part of the engine control.

Claims

Patentansprüche claims
1. Verfahren zur Diagnose der dynamischen Eigenschaften einer Lambdasonde, die wenigstens zeitweilig zu einer zylinderindividuellen Lambdaregelung verwendet wird, dadurch gekennzeichnet, dass wenigstens eine Stellgröße der Lambdaregelung erfasst und mit einer vorgebbaren maximalen Schwelle verglichen wird und im Falle des Überschreitens der maximalen Schwelle das dynamische Verhalten der Lambdasonde im Hinblick auf die Einsatzfahigkeit für die zylinderindividuelle Lambdaregelung als nicht ausreichend bewertet wird.1. A method for diagnosing the dynamic properties of a lambda probe, which is used at least temporarily for a cylinder-specific lambda control, characterized in that at least one manipulated variable of the lambda control is detected and compared with a predeterminable maximum threshold and, if the maximum threshold is exceeded, the dynamic behavior the lambda probe is assessed as insufficient in terms of its suitability for cylinder-specific lambda control.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Wert von Lambda wenigstens eines Zylinders um einen vorgebbaren Wert verstimmt und geprüft wird, ob die Verstimmung um den vorgebbaren Wert als Offset oder Faktor in der Stellgröße des jeweiligen Reglers der Lambdaregelung abgebildet wird.2. The method according to claim 1, characterized in that the value of lambda of at least one cylinder is detuned by a predeterminable value and a check is carried out to determine whether the detuning by the predeterminable value is represented as an offset or a factor in the manipulated variable of the respective regulator of the lambda control.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass geprüft wird, ob die Differenz oder der Absolutwert der Differenz zwischen Verstimmung und Offset kleiner als die vorgebbare maximale Schwelle ist.3. The method according to claim 2, characterized in that it is checked whether the difference or the absolute value of the difference between detuning and Offset is less than the predefinable maximum threshold.
4. Verfahren nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass der Wert von Lambda durch Variation der zylinderindividuellen Kraftstoffmessung verstimmt wird.4. The method according to claim 2 or 3, characterized in that the value of lambda is detuned by varying the cylinder-specific fuel measurement.
5. Verfahren nach einem der Ansprüche 2 bis 4, gekennzeichnet durch die Schritte:5. The method according to any one of claims 2 to 4, characterized by the steps:
Erkennung eines geeigneten Betriebsbereichs für die zylinderindividuelle Lambdaregelung;Detection of a suitable operating range for cylinder-specific lambda control;
Überwachung der Stellgrößen der einzelnen Lambdaregler und, falls eine oder mehrere Stellgrößen betragsmäßig ihre maximale Größe überschreitet, Durchführung der nachfolgenden Schritte;Monitoring the manipulated variables of the individual lambda controllers and, if one or more manipulated variables exceeds their maximum size, performing the following steps;
Erkennung eines geeigneten Zeitpunktes zur Durchführung der nachfolgenden Schritte;Recognition of a suitable point in time for carrying out the subsequent steps;
Zwischenspeicherung der Stellgrößen der einzelnen Lambdaregler;Intermediate storage of the manipulated variables of the individual lambda controllers;
Verstimmung des Wertes von Lambda wenigstens eines Zylinders um den vorgebbaren Wert; Beobachtung der Stellgrößen der einzelnen Lambdaregler;Detuning the value of lambda of at least one cylinder by the predeterminable value; Observation of the manipulated variables of the individual lambda controllers;
Feststellung, ob die Lambdaregler in der Lage sind, die Verstimmung des Wertes von Lambda auszugleichen oder nicht und im Falle, dass die Lambdaregler dazu in der Lage sind, Rücknahme der Verstimmung und Neuinitialisierung der einzelnen Lambdaregler mit den zwischengespeicherten Stellgrößen, andernfalls Ausgabe eines Fehlersignals.Determining whether the lambda controllers are able to compensate for the detuning of the value of lambda or not, and in the event that the lambda controllers are able to cancel the detuning and re-initialize the individual lambda controllers with the temporarily stored manipulated variables, otherwise output of an error signal.
6. Diagnosevorrichtung zur Durchführung des Verfahrens nach einem der vorhergehenden Ansprüche. 6. Diagnostic device for performing the method according to one of the preceding claims.
EP03799439A 2002-12-23 2003-12-19 Method and device for diagnosing the dynamic characteristics of a lambda probe, used for the lambda regulation of individual cylinders Expired - Lifetime EP1581734B1 (en)

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DE10260721 2002-12-23
DE10260721A DE10260721A1 (en) 2002-12-23 2002-12-23 Method and device for diagnosing the dynamic properties of a lambda probe used for cylinder-specific lambda control
PCT/DE2003/004250 WO2004059152A1 (en) 2002-12-23 2003-12-19 Method and device for diagnosing the dynamic characteristics of a lambda probe, used for the lambda regulation of individual cylinders

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CN100449130C (en) 2009-01-07
EP1581734B1 (en) 2008-03-26
JP2006511752A (en) 2006-04-06
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DE50309504D1 (en) 2008-05-08
DE10260721A1 (en) 2004-07-29

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