DE102005033060A1 - Engine management system with oxygen storage catalyser with correction for the ageing of the storage capability - Google Patents
Engine management system with oxygen storage catalyser with correction for the ageing of the storage capability Download PDFInfo
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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
- F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
- F02D41/1441—Plural sensors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0864—Oxygen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/005—Electrical control of exhaust gas treating apparatus using models instead of sensors to determine operating characteristics of exhaust systems, e.g. calculating catalyst temperature instead of measuring it directly
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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
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/0295—Control according to the amount of oxygen that is stored on the exhaust gas treating apparatus
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0802—Temperature of the exhaust gas treatment apparatus
- F02D2200/0804—Estimation of the temperature of the exhaust gas treatment apparatus
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0814—Oxygen storage amount
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0816—Oxygen storage capacity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Toxicology (AREA)
- Emergency Medicine (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft ein Verfahren zur Regelung des einer Brennkraftmaschine mit einem sauerstoffspeicherfähigen Abgaskatalysator zugeführten Kraftstoff/Luftverhältnisses, wobei die Regelung in Abhängigkeit von wenigstens einer konvertierungsrelevanten Änderung der Eigenschaften des Abgaskatalysators erfolgt. Zudem betrifft die Erfindung ein Verfahren zur Diagnose des einer Brennkraftmaschine nachgeschalteten sauerstoffspeicherfähigen Abgaskatalysators.The The present invention relates to a method of controlling the one Internal combustion engine with an oxygen-storable catalytic converter supplied fuel / air ratio, the scheme depending on at least one conversion relevant change of the properties of the Catalytic converter takes place. In addition, the invention relates to a method for the diagnosis of an internal combustion engine downstream oxygen-storing exhaust gas catalyst.
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Ausgehend von diesem Stand der Technik ist es Aufgabe der vorliegenden Erfindung ein verbessertes Verfahren zur Regelung des einer Brennkraftmaschine mit einem sauerstoffspeicherfähigen Abgaskatalysator zugeführten Kraftstoff/Luftverhältnisses und ein weiter verbessertes Verfahren zur Diagnose eines Abgaskatalysators bereitzustellen.outgoing from this prior art, it is an object of the present invention an improved method for controlling an internal combustion engine with an oxygen-storable one Catalytic converter supplied Fuel / air ratio and a further improved method for diagnosing a catalytic converter provide.
Gelöst wird diese Aufgabe, indem das Verfahren zur Regelung des einer Brennkraftmaschine mit einem sauerstoffspeicherfähigen Abgaskatalysator zugeführten Kraftstoff/Luftverhältnisses, wobei die Regelung in Abhängigkeit von wenigstens einer konvertierungsrelevanten Änderung der Eigenschaften des Abgaskatalysators erfolgt, vorsieht, dass als konvertierungsrelevante Änderung der Eigenschaften des Abgaskatalysators der Anstieg des Sauerstoffspeichers über der Katalysatortemperatur, die Konvertierung über dem Abgasmassenstrom bzw. die Konvertierung über der Schadstoffkonzentration, der stationäre Sauerstoffspeicher, der dynamische Sauerstoffspeicher und/oder die emissionsoptimale prozentuale Nutzung des Sauerstoffspeichers berücksichtigt wird.Is solved this task by the method of regulation of an internal combustion engine with an oxygen-storable one Catalytic converter supplied Fuel / air ratio, the scheme depending on at least one conversion relevant change of the properties of the Catalytic converter takes place, provides that as conversion relevant change the properties of the catalytic converter, the increase in the oxygen storage over the Catalyst temperature, the conversion over the exhaust gas mass flow or the Conversion over the pollutant concentration, the stationary oxygen storage, the dynamic oxygen storage and / or the emission-optimal percentage Use of the oxygen storage is considered.
Der Anstieg des Sauerstoffspeichers über der Temperatur wird mit zunehmender Alterung des Abgaskatalysators ausgeprägter. Dabei kann der Anstieg des Sauerstoffspeichers über der Temperatur anhand dem Lambdawert stromauf des Abgaskatalysators und dem Lambdawert stromab des Abgaskatalysators bestimmt werden.Of the Increase in oxygen storage over the Temperature becomes more pronounced with increasing aging of the catalytic converter. there The increase of the oxygen storage over the temperature can be based on the Lambda value upstream of the catalytic converter and the lambda value downstream the catalytic converter can be determined.
Die Konvertierung über dem Abgasmassenstrom bzw. die Konvertierung über der Schadstoffkonzentration nimmt mit zunehmender Alterung ab. Dieser Effekt kann anhand einer Überwachung des Lambdawertes stromab des Abgaskatalysators bei ansteigendem Abgasmassenstrom bzw. bei ansteigender Schadstoffkonzentration beobachtet werden, da es mit zunehmender Alterung schneller zu Durchbrüchen des Lambdawertes stromauf des Abgaskatalysators zu dem Lambdawert stromab des Abgaskatalysators kommt.The Conversion over the exhaust gas mass flow or the conversion above the pollutant concentration decreases with increasing aging. This effect may be based on monitoring the lambda value downstream of the catalytic converter with increasing Exhaust gas mass flow or observed with increasing pollutant concentration as it ages faster with increasing aging of the Lambda value upstream of the catalytic converter downstream of the lambda value the catalytic converter comes.
Auch der stationäre Sauerstoffspeicher und der dynamische Sauerstoffspeicher verschlechtern sich mit zunehmender Alterung des Abgaskatalysators. Das bedeutet, dass sich bei einer konstanten Sauerstoffmodulation ein zunehmender Lambdawert stromab des Abgaskatalysators einstellt, was einer Verringerung des stationären Sauerstoffspeichers entspricht. Bei einer schnelleren Sauerstoffmodulation reduziert sich zudem auch der dynamische Sauerstoffspeicher.Also the stationary one Oxygen storage and dynamic oxygen storage worsen with increasing aging of the catalytic converter. It means that At a constant oxygen modulation, an increasing lambda value downstream of the catalytic converter, which corresponds to a reduction of the stationary oxygen storage. At a faster oxygen modulation also reduces also the dynamic oxygen storage.
Und die emissionsoptimale prozentuale Nutzung des Sauerstoffspeichers zeigt bei zunehmender Alterung des Abgaskatalysators, dass eine bisher geeignete Zwangsmodulation zur optimalen Konvertierung nicht mehr hinreichend ist. Dies kann ebenfalls anhand einer Überwachung der Lambdawerte stromab des Abgaskatalysators beobachtet werden.And the emission-optimal percentage utilization of the oxygen storage shows with increasing aging of the catalytic converter that a So far suitable forced modulation for optimal conversion is not more is sufficient. This can also be done by monitoring Lambda values are observed downstream of the catalytic converter.
Vorteilhaft wird als konvertierungsrelevante Änderung der Eigenschaften des Abgaskatalysators zusätzlich die Verschiebung der Light-Off-Temperatur berücksichtigt. Die Verschiebung der Light-Off-Temperatur ist zu dem Anstieg des Sauerstoffspeichers über der Temperatur proportional und kann in der Aufwärmphase des Abgaskatalysators gleichfalls anhand der Lambdawerte stromauf und stromab des Abgaskatalysators bestimmt werden.Advantageous is considered a conversion-relevant change of the properties of the Catalyst additionally takes into account the shift in the light-off temperature. The postponement The light-off temperature is higher than the oxygen storage Temperature proportional and can also in the warm-up phase of the catalytic converter Based on the lambda values upstream and downstream of the catalytic converter be determined.
Die konvertierungsrelevanten Änderungen der Eigenschaften des Abgaskatalysators können basierend auf Messgrößen und/oder basierend auf Modellgrößen ermittelt werden. Als Messgrößen kommen dabei insbesondere der Lambdawert stromauf des Abgaskatalysators und/oder der Lambdawert stromab des Abgaskatalysators in Betracht, sofern stromauf und stromab des Abgaskatalysators jeweils eine Lambdasonde verbaut ist. Als Modellgrößen können weitere Größen, wie zum Beispiel der aktuelle Sauerstoffspeicher gemäß einer Funktion von verschiedenen Parametern der Brennkraftmaschine bestimmt werden. Grundsätzlich könnte aber auch der Lambdawert stromauf des Abgaskatalysators als eine Modellgröße ermittelt werden.The conversion-relevant changes in the properties of the catalytic converter can be determined based on measured variables and / or based on model variables. The measured variables are in particular the lambda value current on the catalytic converter and / or the lambda value downstream of the catalytic converter into consideration, if upstream and downstream of the catalytic converter each have a lambda sensor is installed. As model variables, further variables, such as, for example, the current oxygen storage in accordance with a function of various parameters of the internal combustion engine can be determined. In principle, however, the lambda value upstream of the exhaust gas catalytic converter could also be determined as a model size.
Zweckmäßig werden die konvertierungsrelevanten Änderungen der Eigenschaften des Abgaskatalysators mittels wenigstens einer Stellgröße für die Regelung des zugeführten Kraftstoff/Luftverhältnisses, nämlich einer Führungs-Regelgröße, einer Störungs-Regelgröße, der Lambdamittellage, der Lambdamodulationsfrequenz, der Lambdamodulationsamplitude und/oder dem Sauerstoffspeicher-Sollwert adaptiert. Durch eine Optimierung dieser Stellgrößen können alle wesentlichen konvertierungsrelevanten Änderungen der Eigenschaften eines der Brennkraftmaschine nachgeschalteten Abgaskatalysators mit einem Sauerstoffspeicher berücksichtigt werden und kann trotz einer mit zunehmender Alterung des Abgaskatalysators auftretenden Verschlechterung der absoluten Konvertierung stets eine maximale relative Konvertierung erreicht werden.Be useful the conversion-relevant changes the properties of the catalytic converter by means of at least one Control value for the control of the supplied Fuel / air ratio, namely a guide variable, one Fault rule size, the Lambda diaphragm, lambda modulation frequency, lambda modulation amplitude and / or adapted to the oxygen storage setpoint. Through an optimization All of these manipulated variables can be significant conversion-relevant changes in the properties one of the internal combustion engine downstream catalytic converter considered with an oxygen storage and can despite a with aging of the catalytic converter occurring deterioration of the absolute conversion always a maximum relative conversion can be achieved.
So werden der Anstieg des Sauerstoffspeichers über der Katalysatortemperatur sowie die Verschiebung der Light-Off-Temperatur durch eine Anpassung der Lambdamodulationsfrequenz, der Lambdamodulationsamplitude in der Aufwärmphase des Abgaskatalysators positiv beeinflusst.So will increase the oxygen storage over the catalyst temperature as well as the shift of the light-off temperature by an adjustment the lambda modulation frequency, the lambda modulation amplitude in the warm-up phase of Catalytic converter positively influenced.
Die abnehmende Konvertierung über dem Abgasmassenstrom bzw. die abnehmende Konvertierung über der Schadstoffkonzentration wird insofern geregelt, dass Betriebspunkte mit hohen Rohemissionen vermieden werden. Dazu werden die Lambdamodulationsamplituden bzw. die Lambdahubbegrenzung der Führungsregler und der Störgrößenregler beeinflusst, wodurch vermieden wird, dass der Motor zum Beispiel während des Ausräumens von Sauerstoff aus dem Sauerstoff des Abgaskatalysators sehr fett betrieben wird.The decreasing conversion over the exhaust gas mass flow or the decreasing conversion over the Pollutant concentration is regulated insofar that operating points be avoided with high raw emissions. These are the Lambdamodulationsamplituden or the lambda stroke limit of the master controller and the disturbance variable controller influenced, thereby avoiding the engine for example while the clearing of Oxygen from the oxygen of the catalytic converter operated very fat becomes.
Der abnehmende stationäre Sauerstoffspeicher und der abnehmende dynamische Sauerstoffspeicher, wird durch eine Anpassung des Sauerstoffspeichers, der Sauerstoffeintragsgeschwindigkeit und der Sauerstoffaustragsgeschwindigkeit kompensiert. Dazu wird das der Brennkraftmaschine zugeführte Kraftstoff/Luftverhältnis über die Führungs-Reglergröße, die Störungs-Reglergröße, die Lambdamodulationsfrequenz und die Lambdamodulationsamplitude adaptiert.Of the decreasing stationary Oxygen storage and decreasing dynamic oxygen storage, is determined by an adaptation of the oxygen storage, the oxygenation rate and the oxygen discharge rate compensated. This will be the the internal combustion engine supplied Fuel / air ratio over the Guide slider size, the Fault regulator size, the lambda modulation frequency and adapts the lambda modulation amplitude.
Und die emissionsoptimale prozentuale Nutzung des Sauerstoffspeichers kann durch eine Veränderung des Sauerstoffspeicher-Sollwertes als eine Funktion der Drehzahl, der Last und der Temperatur kompensiert werden.And the emission-optimal percentage utilization of the oxygen storage can through a change the oxygen storage set point as a function of the speed, the load and the temperature are compensated.
Besonders bevorzugt ist wenigstens eine der Stellgrößen für die adaptierte Regelung des Kraftstoff/Luftverhältnisses mit einer Katalysatorbeheizungsmaßnahme gekoppelt. So kann zum Beispiel die Kompensation des Anstiegs des Sauerstoffspeichers über der Katalysatortemperatur und der Verschiebung der Light-Off-Temperatur nicht nur durch eine Anpassung der Lambdamodulationsfrequenz und der Lambdamodulationsamplitude in der Aufwärmphase des Abgaskatalysators, sondern auch durch eine damit gekoppelte Erhöhung der Katalysatorbeheizungsmaßnahmen bzw. durch eine Verkürzung der Anspringzeit des Abgaskatalysators unterstützt werden.Especially at least one of the manipulated variables for the adapted control of the Fuel / air ratio coupled with a catalyst heating measure. So can to Example the compensation of the increase of the oxygen storage over the Catalyst temperature and the shift of the light-off temperature not just by adjusting the lambda modulation frequency and the Lambdamodulationsamplitude in the warm-up phase of the catalytic converter, but also by a coupled increase in catalyst heating measures or by a shortening the light-off time of the catalytic converter can be supported.
Bevorzugt ist wenigstens eine der Stellgrößen für die adaptierte Regelung des Kraftstoff/Luftverhältnisses bezüglich der Motorlast und der Motordrehzahl in einem Kennfeld abgelegt.Prefers is at least one of the manipulated variables for the adapted Regulation of the fuel / air ratio in terms of the engine load and the engine speed stored in a map.
Lösungsgemäß wird ferner bei einem Verfahren zur Diagnose des einer Brennkraftmaschine nachgeschalteten sauerstoffspeicherfähigen Abgaskatalysators, wobei die Regelung des zugeführten Kraftstoff/Luftverhältnisses in Abhängigkeit von wenigstens einer konvertierungsrelevanten Änderung der Eigenschaften des Abgaskatalysators erfolgt und die konvertierungsrelevanten Änderungen mittels wenigstens einer Stellgröße adaptiert werden, die Diagnose basierend auf einem Vergleich von wenigstens einer der aktuellen Stellgrößen mit einem der jeweiligen Stellgröße zugeordneten maximal zulässigen Schwellenwert durchgeführt. Denn werden die maximal zulässigen Schwellenwerte bzw. die maximal zulässigen Veränderungen von wenigstens einer der Stellgrößen überschritten, so kann trotz der adaptierten Regelung des Kraftstoff/Luftverhältnisses keine ausreichend gute Schadstoffkonvertierung mehr erreicht werden und ist der Abgaskatalysator als defekt einzustufen.The solution is further in a method for the diagnosis of an internal combustion engine downstream oxygen storable Catalytic converter, wherein the control of the supplied air / fuel ratio dependent on at least one conversion relevant change of the properties of the Catalytic converter takes place and the conversion-relevant changes adapted by means of at least one manipulated variable be the diagnosis based on a comparison of at least one of the current manipulated variables one of the respective control value assigned maximum permissible Threshold performed. Because the maximum allowable Threshold values or the maximum permissible changes of at least one of Control values exceeded, so can despite the adapted control of the air / fuel ratio no sufficiently good pollutant conversion can be achieved and the exhaust gas catalyst is classified as defective.
Vorteilhaft wird die Diagnose basierend auf der Relation zwischen den Vergleichen von wenigstens zwei unterschiedlichen Stellgrößen mit deren zugeordneten maximalen Schwellenwerten durchgeführt. Denn indem zwei der unterschiedlichen Stellgrößen zueinander in Relation gebracht werden kann mittels des Verfahrens zur Diagnose auch festgestellt werden, ob die Konvertierung bezüglich der im Abgas enthaltenen Stickoxide oder ob die Konvertierung bezüglich der im Abgas enthaltenen Kohlenwasserstoffe nicht mehr ausreichend ist, was aufgrund künftiger Abgasgesetze wünschenswert ist.Advantageous the diagnosis is based on the relation between the comparisons of at least two different control variables with their associated maximum thresholds. Because by two of the different Manipulated variables to each other can be related by the method of diagnosis also be determined if the conversion regarding the in the exhaust gas contained nitrogen oxides or whether the conversion with respect to hydrocarbons contained in the exhaust gas is no longer sufficient, which due to future emission laws desirable is.
Besonders vorteilhaft wird die Diagnose basierend auf einer Quotientenbildung zwischen der aktuellen Stellgröße und der entsprechenden Stellgröße für einen neuwertigen Abgaskatalysator zur kontinuierlichen Überwachung bzw. zur graduellen Bewertung der Alterung des Abgaskatalysators durchgeführt. Dies hat den Vorteil, dass zu jedem Zeitpunkt eine Aussage hinsichtlich des Alterungszustands des Abgaskatalysators gemacht werden kann. Somit kann ein Abgaskatalysator zum Beispiel während einer Inspektion als nahezu defekt erkannt und ausgetauscht werden, bevor er als defekt eingestuft wird.Particularly advantageous is the diagnosis ba based on a quotient formation between the current manipulated variable and the corresponding manipulated variable for a new exhaust gas catalyst for continuous monitoring or for the gradual evaluation of the aging of the catalytic converter performed. This has the advantage that at any time a statement can be made regarding the aging state of the catalytic converter. Thus, for example, an exhaust catalyst may be detected as being defective during an inspection and replaced before it is classified as defective.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE102005033060A DE102005033060A1 (en) | 2005-07-15 | 2005-07-15 | Engine management system with oxygen storage catalyser with correction for the ageing of the storage capability |
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DE102005033060A DE102005033060A1 (en) | 2005-07-15 | 2005-07-15 | Engine management system with oxygen storage catalyser with correction for the ageing of the storage capability |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009092465A1 (en) * | 2008-01-24 | 2009-07-30 | Continental Automotive Gmbh | Method and device for operating an internal combustion engine |
DE102009053091A1 (en) * | 2009-11-13 | 2011-05-19 | Audi Ag | Method for operating internal combustion engine, involves carrying out supply of fuel and air to internal combustion engine such that exhaust gas escaping to combustion engine discharges in extent of exhaust gas mass flow |
WO2022024137A1 (en) * | 2020-07-31 | 2022-02-03 | Tvs Motor Company Limited | An on-board age monitoring system and method for a vehicle |
-
2005
- 2005-07-15 DE DE102005033060A patent/DE102005033060A1/en not_active Ceased
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009092465A1 (en) * | 2008-01-24 | 2009-07-30 | Continental Automotive Gmbh | Method and device for operating an internal combustion engine |
US9551263B2 (en) | 2008-01-24 | 2017-01-24 | Continental Automotive Gmbh | Method and device for operating an internal combustion engine |
DE102009053091A1 (en) * | 2009-11-13 | 2011-05-19 | Audi Ag | Method for operating internal combustion engine, involves carrying out supply of fuel and air to internal combustion engine such that exhaust gas escaping to combustion engine discharges in extent of exhaust gas mass flow |
DE102009053091B4 (en) * | 2009-11-13 | 2014-02-06 | Audi Ag | Method for operating an internal combustion engine |
WO2022024137A1 (en) * | 2020-07-31 | 2022-02-03 | Tvs Motor Company Limited | An on-board age monitoring system and method for a vehicle |
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