EP1180594A2 - Method for testing an exhaust gas recirculation system - Google Patents
Method for testing an exhaust gas recirculation system Download PDFInfo
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- EP1180594A2 EP1180594A2 EP01118459A EP01118459A EP1180594A2 EP 1180594 A2 EP1180594 A2 EP 1180594A2 EP 01118459 A EP01118459 A EP 01118459A EP 01118459 A EP01118459 A EP 01118459A EP 1180594 A2 EP1180594 A2 EP 1180594A2
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- Prior art keywords
- exhaust gas
- gas recirculation
- recirculation rate
- nox
- change
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/45—Sensors specially adapted for EGR systems
- F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/49—Detecting, diagnosing or indicating an abnormal function of the EGR system
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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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
- F02D41/0055—Special engine operating conditions, e.g. for regeneration of 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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/45—Sensors specially adapted for EGR systems
- F02M26/48—EGR valve position sensors
Definitions
- the invention relates to a method for checking a Exhaust gas recirculation system of an internal combustion engine.
- exhaust gas recirculation systems are also known.
- exhaust gas recirculation systems become part of the exhaust gas flow mixed with the fresh gas stream flowing into the cylinders.
- Exhaust gas for combustion is an inert gas, the NOx raw emissions of the internal combustion engine.
- the regulation of recirculated exhaust gas flow, the so-called exhaust gas recirculation rate, usually takes place via a switch in the return line Exhaust gas recirculation valve.
- Such an exhaust gas recirculation system is a emission-relevant component.
- Such components are due applicable or future regulations in the operation of a Internal combustion engine to undergo a review Failure or incorrect operation of the exhaust gas recirculation system the emission behavior of an internal combustion engine drastically deteriorate and exceed given Limit values could result.
- exhaust gas recirculation valve One that is particularly threatened by the failure or particularly in the event of failure Component of an exhaust gas recirculation system leading to increased emissions is the exhaust gas recirculation valve, through which the exhaust gas recirculation rate is set. So far, one relies on diagnosis this exhaust gas recirculation valve arranged in the intake manifold Pressure sensor that detects the intake manifold pressure. at the same time the intake air mass is determined using an air mass meter. From the air mass sucked in, one can expected position of the exhaust gas recirculation valve Intake manifold pressure downstream of an internal combustion engine throttle valve to calculate. If there is a discrepancy between the measured and calculated intake manifold pressure, will be a faulty one Exhaust gas recirculation valve diagnosed. This principle is for example described in DE 44 06 281 A1.
- the invention has for its object a method for Examination of an exhaust gas recirculation system to indicate which none Pressure measurement in the intake manifold is required.
- the invention uses the knowledge that changes in the exhaust gas recirculation rate the NOx emissions of an internal combustion engine can strongly influence. Now change the exhaust gas recirculation rate to a certain extent, can be due to a lack of expected change in the NOx emission of the Internal combustion engine detected a faulty exhaust gas recirculation system become. This concept is for everyone with exhaust gas recirculation systems equipped internal combustion engines.
- One of these can be used to determine the concentration difference NOx concentration measurements also through a model determination of raw NOx emissions, replacing known models can be used from the operating parameters of the Internal combustion engine emitted for this operating state Estimate NOx concentration.
- a model value for the NOx concentration can be the concentration difference along with measuring the NOx concentration after the change form and either the model value for the NOx concentration before changing the exhaust gas recirculation rate or the model value for the operating state after the change the exhaust gas recirculation rate. It is useful here however, that otherwise largely constant operating conditions of the internal combustion engine, since then the fault when determining the NOx concentration, if possible is low.
- the internal combustion engine has a NOx storage catalytic converter
- you can also use a NOx concentration sensor for diagnosis use as usual to control a NOx storage catalyst of this catalyst is provided.
- a well-known arrangement is e.g. a sensor located downstream of the catalyst. Because such a NOx storage catalytic converter is in usually the NOx compounds absorbed in the exhaust gas must this arrangement for carrying out the check that this absorption does not take place temporarily. In a preferred development of the invention, this can be done can be achieved by having the catalyst before checking saturated to its maximum storage capacity becomes.
- One can reach the state of saturation with the downstream NOx concentration sensor capture, e.g. by comparing a modeled NOx concentration with a measured NOx concentration or by appropriate interpretation of the during a storage process resulting gradients of the NOx concentration downstream of the NOx storage catalytic converter.
- Saturation can be reached particularly quickly if for high raw NOx emissions upstream of the NOx storage catalytic converter is taken care of, for example by the Exhaust gas recirculation rate below a certain threshold or particularly preferred is set near zero.
- Figure 1 is an Otto engine in the form of a block diagram shown with direct injection, whereby only those components are shown that are for the Understanding of the invention are necessary; are in particular the fuel circuit and an exhaust gas aftertreatment system not shown.
- the internal combustion engine of FIG. 1 has an intake tract 1 with an air collector 2 on a suction pipe 3 in one Cylinder 6 of the internal combustion engine opens.
- the better clarity only one cylinder 6 is shown for the sake of this; the number of cylinders is not important.
- Injector 20 fuel injected.
- Air collector 2 there is a throttle valve 5 by one Throttle valve actuator 12 is operated, which is also from Control unit 10 is controlled.
- an air mass meter 4 provided upstream of the throttle valve 5 in the intake tract 1.
- Downstream of the throttle valve 5 opens into the intake tract 1 an exhaust gas recirculation line 8, which on the other hand to the exhaust tract 7 of the internal combustion engine is connected, in which the Combustion gases flow out of cylinder 6.
- In the exhaust gas recirculation line 8 there is an exhaust gas recirculation valve 9, which is actuated by an actuator 14 which is operated by the control unit 10 is controlled.
- There is a position feedback provided, via which the control unit 10 on the exhaust gas recirculation valve 9 detected degree of opening.
- crankshaft sensor 13 which Speed of the crankshaft 15 senses.
- NOx sensor in exhaust tract 7 16, which measures the NOx concentration in the exhaust gas by the Exhaust tract flows.
- Any catalysts provided in the exhaust tract, NOx storage or 3-way catalysts are the Not shown for the sake of clarity.
- the control device 10 has a plurality of program modules 11, 17, 19 and 18, which will be discussed later.
- a first NOx concentration NOxl measured is done using the measuring module 11 of the Control unit 10, which reads out the NOx sensor 16. Subsequently becomes a in step S2 on the exhaust gas recirculation valve 9 preset change in the exhaust gas recirculation rate in the memory module 17 set; this is done by the EGR module 18 of the control unit 10 made.
- the change is chosen so that the exhaust gas recirculation rate has a predetermined jump of high Exhaust gas recirculation rate to low exhaust gas recirculation rate, for example from a high setpoint to 0%.
- step S3 After this change in the exhaust gas recirculation rate is again over the NOx sensor 16 the NOx concentration in the exhaust gas of the internal combustion engine measured and as the value NOx2 in the memory module 17 of the control unit 10 stored. This is also done again the measuring module 11 (step S3). Then it is checked in step S4 whether the difference between NOx1 and NOx2 is also one threshold value SW1 stored in the memory module 17 exceeds. If this is not the case (N branch), then in a step S5 an error of the exhaust gas recirculation system (in particular of the exhaust gas recirculation valve 9). Otherwise (J-branch) becomes a proper return system in step S6 diagnosed.
- NOx1 a NOx concentration determined in a model be used.
- This model is determined in the NOx model module 19 of the control unit 10.
- the NOx model module 19 calculates the raw emission of NOx in the exhaust gas in a known manner the internal combustion engine. So that this model calculation is possible fails exactly, the review process will only performed when the crankshaft sensor 13 indicates that the Speed of the crankshaft 15 and the engine remains within a certain window, preferably constant is. The accuracy is further increased if at the same time the load, i.e. that indicated by the air mass meter 4, Air mass flowing into the internal combustion engine in certain Limits is constant.
- step S4 takes place between the modeled NOx concentration and the measured NOx concentration NOx2 after changing the exhaust gas recirculation rate in step S2.
- Step S1 can be omitted in this modification, since no longer the measured NOx concentration NOx1, but a modeled value is input in step S4.
- the memory module 17 then contains suitable maps.
- step S7 the exhaust gas recirculation rate to a level below a threshold Value, in this case set to zero.
- the NOx concentration is measured by means of the NOx sensor 16 and stored as the value NOx3 in the memory module 17.
- step S9 it is then checked whether the value NOx3 exceeds a threshold value.
- step S8 jumps back. Only when the query in step S9 to a leads to a positive result (J-branching) is the NOx storage catalytic converter in saturation and NOx levels supplied to it punch through to its exit. Then in step S10 the exhaust gas recirculation rate to a high value, for example 100% set and the process steps of the figure follow Second
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Testing Of Engines (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Überprüfung einer Abgasrückführanlage einer Brennkraftmaschine.The invention relates to a method for checking a Exhaust gas recirculation system of an internal combustion engine.
Um den Kraftstoffverbrauch von Otto-Brennkraftmaschinen weiter zu reduzieren, kommen immer häufiger Brennkraftmaschinen zum Einsatz, die außer mit stöchiometrischem Gemisch auch mit magerer Verbrennung betrieben werden können. Bei Otto-Brennkraftmaschinen mit magerer Verbrennung wird der Luftüberschuß so groß gewählt, wie es die Lastanforderung an die Brennkraftmaschine gestattet; bei geringer Lastanforderung kann in einem Schichtlade-Betrieb das Kraftstoff/Luft-Gemisch, mit dem die Brennkraftmaschine betrieben wird, Lambda-Werte von 3 und mehr aufweisen.To continue the fuel consumption of Otto internal combustion engines to reduce, come more and more internal combustion engines to be used with a stoichiometric mixture as well lean combustion can be operated. With Otto internal combustion engines with lean combustion the excess air becomes chosen as large as it is the load requirement on the Internal combustion engine allowed; with low load requirement In a stratified charge operation, the fuel / air mixture, with which the internal combustion engine is operated, lambda values of 3 and more.
Zur Erfüllung geforderter Abgasemissionsgrenzwerte sind bei solchen Brennkraftmaschinen spezielle Maßnahmen erforderlich, da ansonsten die emittierten NOx-Massen zu groß wären. Dies gilt ebenso für Diesel-Brennkraftmaschinen. Neben dem Einsatz von NOx-Speicherkatalysatoren, die aufgrund ihrer Beschichtungen in der Lage sind, NOx-Verbindungen aus dem Abgas, die bei magerer Verbrennung entstehen, in einer Speicherphase zu absorbieren und in einer Regenerationsphase unter Zugabe eines Reduktionsmittels in unschädliche Verbindungen umzuwandeln, sind auch sogenannte Abgasrückführanlagen bekannt. In solchen Abgasrückführanlagen wird ein Teil des Abgasstroms dem in die Zylinder strömenden Frischgasstrom beigemischt. Da Abgas für die Verbrennung ein Inertgas ist, sinkt dadurch die NOx-Rohemission der Brennkraftmaschine. Die Regelung des rückgeführten Abgasstromes, der sogenannten Abgasrückführrate, erfolgt meist über ein in die Rückführleitung geschaltetes Abgasrückführventil. To meet the required exhaust emission limit values are at such internal combustion engines require special measures, otherwise the emitted NOx masses would be too large. This also applies to diesel internal combustion engines. In addition to use of NOx storage catalysts due to their coatings are able to remove NOx compounds from the exhaust gas with lean combustion occur in a storage phase absorb and in a regeneration phase with the addition of a Convert reducing agent into harmless compounds, So-called exhaust gas recirculation systems are also known. In Such exhaust gas recirculation systems become part of the exhaust gas flow mixed with the fresh gas stream flowing into the cylinders. There Exhaust gas for combustion is an inert gas, the NOx raw emissions of the internal combustion engine. The regulation of recirculated exhaust gas flow, the so-called exhaust gas recirculation rate, usually takes place via a switch in the return line Exhaust gas recirculation valve.
Es handelt sich bei einer solchen Abgasrückführanlage um ein emissionsrelevantes Bauteil. Solche Bauteile sind aufgrund geltender bzw. zukünftiger Vorschriften im Betrieb einer Brennkraftmaschine einer Überprüfung zu unterziehen, da ein Versagen oder fehlerhafter Betrieb der Abgasrückführanlage das Emissionsverhalten einer Brennkraftmaschine drastisch verschlechtern und zu einer Überschreitung vorgegebener Grenzwerte führen könnte.Such an exhaust gas recirculation system is a emission-relevant component. Such components are due applicable or future regulations in the operation of a Internal combustion engine to undergo a review Failure or incorrect operation of the exhaust gas recirculation system the emission behavior of an internal combustion engine drastically deteriorate and exceed given Limit values could result.
Ein vom Ausfall besonders bedrohtes bzw. bei Ausfall besonders zu Emissionserhöhungen führendes Bauteil einer Abgasrückführanlage ist das Abgasrückführventil, über das die Abgasrückführrate eingestellt wird. Bislang setzt man zur Diagnose dieses Abgasrückführventils einen im Saugrohr angeordneten Drucksensor ein, der den Saugrohrdruck erfaßt. Zugleich wird die angesaugte Luftmasse über einen Luftmassenmesser ermittelt. Aus der angesaugten Luftmasse kann man den bei einer bestimmten Stellung des Abgasrückführventils zu erwartenden Saugrohrdruck stromab einer Drosselklappe einer Brennkraftmaschine berechnen. Ergibt sich eine Abweichung zwischen gemessenem und berechnetem Saugrohrdruck, wird ein fehlerhaftes Abgasrückführventil diagnositiziert. Dieses Prinzip ist beispielsweise in der DE 44 06 281 A1 beschrieben.One that is particularly threatened by the failure or particularly in the event of failure Component of an exhaust gas recirculation system leading to increased emissions is the exhaust gas recirculation valve, through which the exhaust gas recirculation rate is set. So far, one relies on diagnosis this exhaust gas recirculation valve arranged in the intake manifold Pressure sensor that detects the intake manifold pressure. at the same time the intake air mass is determined using an air mass meter. From the air mass sucked in, one can expected position of the exhaust gas recirculation valve Intake manifold pressure downstream of an internal combustion engine throttle valve to calculate. If there is a discrepancy between the measured and calculated intake manifold pressure, will be a faulty one Exhaust gas recirculation valve diagnosed. This principle is for example described in DE 44 06 281 A1.
Aus der DE 42 16 044 A1 ist es bekannt, die Funktion einer Abgasrückführanlage anhand der Laufruhe der Brennkraftmaschine zu erkennen, da die Häufigkeiten von Aussetzer bzw. die Laufunruhe einer Brennkraftmaschine mit der Abgasrückführrate steigt.From DE 42 16 044 A1 it is known the function of a Exhaust gas recirculation system based on the smooth running of the internal combustion engine recognizable because the frequencies of dropouts or the Uneven running of an internal combustion engine with the exhaust gas recirculation rate increases.
Weiter ist es aus der DE 36 24 441 A1 bekannt, im Leerlauf
einer Brennkraftmaschine die Abgasrückführrate zu verändern
und die Drehzahlschwankung der Brennkraftmaschine zu überwachen.
Ein ähnliches Verfahren ist auch in der EP 0 635 629 A1
offenbart. It is also known from DE 36 24 441 A1, at idle
to change the exhaust gas recirculation rate of an internal combustion engine
and monitor the speed fluctuation of the internal combustion engine.
A similar process is also in
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Überprüfung einer Abgasrückführanlage anzugeben, bei dem keine Druckmessung im Saugrohr erforderlich ist.The invention has for its object a method for Examination of an exhaust gas recirculation system to indicate which none Pressure measurement in the intake manifold is required.
Diese Aufgabe wird durch die in Anspruch 1 gegekennzeichnete
Erfindung gelöst.This object is characterized by that in
Die Erfindung nutzt die Erkenntnis, daß Veränderungen der Abgasrückführrate die NOx-Emissionen eines Verbrennungsmotors stark beeinflussen können. Verändert man nun die Abgasrückführrate um ein bestimmtes Maß, kann an einem Ausbleiben der an und für sich zu erwartenden Änderung der NOx-Emission der Brennkraftmaschine eine fehlerhafte Abgasrückführanlage erkannt werden. Dieses Konzept ist für alle mit Abgasrückführanlagen ausgerüsteten Brennkraftmaschinen geeignet.The invention uses the knowledge that changes in the exhaust gas recirculation rate the NOx emissions of an internal combustion engine can strongly influence. Now change the exhaust gas recirculation rate to a certain extent, can be due to a lack of expected change in the NOx emission of the Internal combustion engine detected a faulty exhaust gas recirculation system become. This concept is for everyone with exhaust gas recirculation systems equipped internal combustion engines.
Diese Überprüfung ist besonders dann einfach durchzuführen, wenn die NOx-Emission der Brennkraftmaschine ansonsten konstant wäre, was insbesondere bei statischen Betriebszuständen der Brennkraftmaschine der Fall ist, insbesondere wenn also die zeitliche Änderung von Last und/oder Drehzahl der Brennkraftmaschine unter einer gewissen, geeigneten Grenze bleibt.This check is particularly easy to carry out if the NOx emission of the internal combustion engine is otherwise constant would be what especially in static operating conditions the internal combustion engine is the case, especially if so the temporal change in load and / or speed of the internal combustion engine remains below a certain, appropriate limit.
Um ein Ausbleiben einer zu erwartenden NOx-Konzentration im Abgas der Brennkraftmaschine zu erkennen, sind verschiedene Ansätze denkbar. Zum einen kann man eine Konzentrationsdifferenz aus der im Abgas gemessenen NOx-Konzentration vor und nach Veränderung der Abgasrückführrate bilden. Diese Konzentrationsdifferenz hängt natürlich von der vorgenommenen Veränderung der Abgasrückführrate ab. Bleibt trotz Veränderung der Abgasrückführrate eine zu erwartende Konzentrationsdifferenz aus, ist die Abgasrückführanlage defekt. Die NOx-Konzentration kann dabei an beliebiger Stelle im Abgastrakt gemessen werden, insbesondere stromauf eines Katalysators.To prevent the expected NOx concentration in the Detecting exhaust gas from the internal combustion engine is different Approaches possible. First, you can see a concentration difference from the NOx concentration measured in the exhaust gas before and after changing the exhaust gas recirculation rate. This difference in concentration depends of course on the change made the exhaust gas recirculation rate. Remains despite the change Exhaust gas recirculation rate is an expected concentration difference off, the exhaust gas recirculation system is defective. The NOx concentration can be anywhere in the exhaust system be measured, especially upstream of a catalyst.
Zur Ermittlung der Konzentrationsdifferenz kann man eine dieser NOx-Konzentrationsmessungen auch durch eine Modellbestimmung der NOx-Rohemissionen ersetzen, wobei dazu bekannte Modelle verwendet werden können, die aus Betriebsparametern der Brennkraftmaschine die für diesen Betriebszustand emittierte NOx-Konzentration schätzen. Mit einem solchen Modellwert für die NOx-Konzentration kann man die Konzentrationsdifferenz zusammen mit der Messung der NOx-Konzentration nach der Veränderung bilden und dafür entweder den Modellwert für die NOx-Konzentration vor der Veränderung der Abgasrückführrate oder den Modellwert für den Betriebszustand nach der Veränderung der Abgasrückführrate heranziehen. Zweckmäßig ist es dabei jedoch, daß im übrigen weitgehend konstante Betriebsbedingungen der Brennkraftmaschine vorliegen, da dann der Fehler bei der Modellermittlung der NOx-Konzentration möglichst gering ist.One of these can be used to determine the concentration difference NOx concentration measurements also through a model determination of raw NOx emissions, replacing known models can be used from the operating parameters of the Internal combustion engine emitted for this operating state Estimate NOx concentration. With such a model value for the NOx concentration can be the concentration difference along with measuring the NOx concentration after the change form and either the model value for the NOx concentration before changing the exhaust gas recirculation rate or the model value for the operating state after the change the exhaust gas recirculation rate. It is useful here however, that otherwise largely constant operating conditions of the internal combustion engine, since then the fault when determining the NOx concentration, if possible is low.
Verfügt die Brennkraftmaschine über einen NOx-Speicherkatalysator, kann man zur Diagnose auch einen NOx-Konzentrationsmeßaufnehmer verwenden, wie er üblicherweise zur Steuerung eines NOx-Speicherkatalysators dieses Katalysators vorgesehen ist. Ähnliches gilt für Brennkraftmaschinen mit einem 3-Wege-Katalysator im Abgastrakt. Eine bekannte Anordnung ist z.B. ein stromab des Katalysators liegender Meßaufnehmer. Da ein solcher NOx-Speicherkatalysator aber in der Regel die NOx-Verbindungen im Abgas absorbiert, muß bei dieser Anordnung zur Durchführung der Überprüfung dafür gesorgt werden, daß diese Absorption zeitweise nicht stattfindet. Dies kann in einer bevorzugten Weiterbildung der Erfindung dadurch erreicht werden, daß der Katalysator vor der Überprüfung bis zu seiner maximalen Speicherfähigkeit gesättigt wird. Das Erreichen des Sättigungszustandes kann man mit dem stromabwärts angeordneten NOx-Konzentrationsmeßaufnehmer erfassen, z.B. durch Vergleich einer modellierten NOx-Konzentration mit einer gemessenen NOx-Konzentration oder durch geeignete Intepretation des während eines Speichervorgangs anfallenden Gradienten der NOx-Konzentration stromab des NOx-Speicherkatalysators. If the internal combustion engine has a NOx storage catalytic converter, you can also use a NOx concentration sensor for diagnosis use as usual to control a NOx storage catalyst of this catalyst is provided. The same applies to internal combustion engines with a 3-way catalytic converter in the exhaust system. A well-known arrangement is e.g. a sensor located downstream of the catalyst. Because such a NOx storage catalytic converter is in usually the NOx compounds absorbed in the exhaust gas must this arrangement for carrying out the check that this absorption does not take place temporarily. In a preferred development of the invention, this can be done can be achieved by having the catalyst before checking saturated to its maximum storage capacity becomes. One can reach the state of saturation with the downstream NOx concentration sensor capture, e.g. by comparing a modeled NOx concentration with a measured NOx concentration or by appropriate interpretation of the during a storage process resulting gradients of the NOx concentration downstream of the NOx storage catalytic converter.
Ist der NOx-Katalysator gesättigt, schlagen Änderungen der NOx-Konzentration stromauf des Katalysators zum Katalysatorausgang durch, so daß dann eine Überprüfung möglich ist.If the NOx catalyst is saturated, changes in the NOx concentration upstream of the catalytic converter to the catalytic converter outlet through, so that a check is then possible.
Die Sättigung kann besonders schnell erreicht werden, wenn für eine hohe NOx-Rohemission stromauf des NOx-Speicherkatalysators gesorgt wird, beispielsweise indem die Abgasrückführrate unter einem bestimmten Schwellwert oder besonders bevorzugte nahe Null gestellt wird.Saturation can be reached particularly quickly if for high raw NOx emissions upstream of the NOx storage catalytic converter is taken care of, for example by the Exhaust gas recirculation rate below a certain threshold or particularly preferred is set near zero.
Grundsätzlich erhält man eine besonders gute Diagnose, wenn die Abgasrückführrate von einem Maximalwert auf einen Minimalwert gestellt wird. Um dies in der Variante mit der beschleunigten Sättigung eines NOx-Speicherkatalysators zu erreichen, muß, wenn festgestellt wird, daß der NOx-Speicherkatalysator in der Sättigung ist, zuerst die Abgasrückführrate von dem unter den Minimalwert liegenden Wert erhöht werden, damit sie anschließend wieder verringert werden kann, um die Konzentrationsdifferenz zu bilden.Basically you get a particularly good diagnosis if the exhaust gas recirculation rate from a maximum value to a minimum value is provided. To do this in the variant with the accelerated To achieve saturation of a NOx storage catalytic converter, must, if it is determined that the NOx storage catalyst is in saturation, the EGR rate first increased from the value below the minimum value so that they are then reduced again can to form the concentration difference.
Wie die zur Überprüfung eingestellte Veränderung der Abgasrückführrate zeitlich durchgeführt wird, ist prinzipiell unerheblich. Stellt man eine rampenartige Änderung der Abgasrückführrate ein, verläuft die Diagnose mit besonders geringen Auswirkungen auf den Betrieb der Brennkraftmaschine, da die mit der Änderung der Abgasrückführrate unvermeidlich einhergehende Änderung der Laufruhe der Brennkraftmaschine langsam verläuft. Möchte man die Diagnose möglichst sicher gestalten, bietet es sich an, die Abgasrückführrate sprungartig zu erhöhen. Dieses Vorgehen hat weiter den Vorteil, daß die Überprüfung nur eine sehr kurze Zeitdauer in Anspruch nimmt, mithin nur eine sehr geringe Erhöhung der emittierten NOx-Masse durch die Überprüfung anfällt.Like the change in the exhaust gas recirculation rate set for checking is carried out in principle is irrelevant. If you make a ramp-like change in the exhaust gas recirculation rate the diagnosis runs with a particularly low level Effects on the operation of the internal combustion engine since the inevitably associated with the change in the exhaust gas recirculation rate Change in the smooth running of the internal combustion engine slowly runs. If you want to make the diagnosis as safe as possible, it offers itself, the exhaust gas recirculation rate suddenly to increase. This procedure has the further advantage that the Verification takes a very short amount of time therefore only a very slight increase in the emitted NOx mass due to the review.
Vorteilhafte Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche. Advantageous developments of the invention are the subject of subclaims.
Die Erfindung wird nachfolgend unter Bezugnahme auf die Zeichnungen in Ausführungsbeispielen näher erläutert. In der Zeichnung zeigt:
Figur 1- eine schematische Darstellung einer Brennkraftmaschine mit einer Abgasrückführanlage,
Figur 2- ein Ablaufdiagramm eines Verfahrens zur Überprüfung einer Abgasrückführanlage und
- Figur 3
- ein weiteres Ablaufdiagramm für ein abgewandeltes Überprüfungsverfahren.
- Figure 1
- 1 shows a schematic illustration of an internal combustion engine with an exhaust gas recirculation system,
- Figure 2
- a flowchart of a method for checking an exhaust gas recirculation system and
- Figure 3
- another flow chart for a modified verification procedure.
In Figur 1 ist in Form eines Blockschaltbildes eine Otto-Brennkraftmaschine mit Direkteinspritzung dargestellt, wobei nur diejenigen Komponenten eingezeichnet sind, die für das Verständnis der Erfindung notwendig sind; insbesondere sind der Kraftstoffkreislauf sowie eine Abgasnachbehandlungsanlage nicht dargestellt.In Figure 1 is an Otto engine in the form of a block diagram shown with direct injection, whereby only those components are shown that are for the Understanding of the invention are necessary; are in particular the fuel circuit and an exhaust gas aftertreatment system not shown.
Die Brennkraftmaschine der Figur 1 weist einen Ansaugtrakt 1
mit einem Luftsammler 2 auf, der über ein Saugrohr 3 in einen
Zylinder 6 der Brennkraftmaschine mündet. Der besseren Übersichtlichkeit
halber ist nur ein Zylinder 6 eingezeichnet;
auf die Zahl der Zylinder kommt es jedoch nicht an.The internal combustion engine of FIG. 1 has an
In den Zylinder 6 wird über ein von einem Steuergerät 10 gesteuertes
Einspritzventil 20 Kraftstoff eingespritzt. Im
Luftsammler 2 befindet sich eine Drosselklappe 5, die von einem
Drosselklappensteller 12 betätigt wird, der ebenfalls vom
Steuergerät 10 angesteuert wird. Weiter ist ein Luftmassenmesser
4 stromauf der Drosselklappe 5 im Ansaugtrakt 1 vorgesehen.
Stromab der Drosselklappe 5 mündet in den Ansaugtrakt
1 eine Abgasrückführleitung 8, die andererseits an den Abgastrakt
7 der Brennkraftmaschine angeschlossen ist, in dem die
Verbrennungsgase aus dem Zylinder 6 strömen. In der Abgasrückführleitung
8 befindet sich ein Abgasrückführventil 9,
das von einem Stellglied 14 betätigt wird, welches vom Steuergerät
10 angesteuert wird. Dabei ist eine Lagerückmeldung
vorgesehen, über die das Steuergerät 10 den am Abgasrückführventil
9 eingestellten Öffnungsgrad erfaßt.In the
Weiter ist noch ein Kurbelwellensensor 13 vorgesehen, der die
Drehzahl der Kurbelwelle 15 abfühlt.Furthermore, a
Im Abgastrakt 7 befindet sich schließlich noch ein NOx-Sensor 16, der die NOx-Konzentration im Abgas mißt, das durch den Abgastrakt strömt. Etwaige im Abgastrakt vorgesehene Katalysatoren, NOx-Speicher- oder 3-Wege-Katalysatoren, sind der besseren Übersichtlichkeit halber nicht eingezeichnet.Finally, there is a NOx sensor in exhaust tract 7 16, which measures the NOx concentration in the exhaust gas by the Exhaust tract flows. Any catalysts provided in the exhaust tract, NOx storage or 3-way catalysts are the Not shown for the sake of clarity.
Das Steuergerät 10 weist mehrere Programm-Module 11, 17, 19
und 18 auf, auf die noch eingegangen werden wird.The
Zur Überprüfung des Abgasrückführventils 9 wird nun folgendes, als Flußdiagramm in Figur 2 dargestellte Verfahren durchgeführt. Dabei bezeichnen die Bezugszeichen, denen der Buchstabe "S" vorangestellt ist, Schritte des Verfahrens.To check the exhaust gas recirculation valve 9, the following is now process shown as a flow chart in Figure 2 carried out. The reference numerals designate the Letter "S" precedes steps of the procedure.
Zuerst wird in einem Schritt S1 eine erste NOx-Konzentration
NOxl gemessen. Dies erfolgt mit Hilfe des Meßmoduls 11 des
Steuergerätes 10, das den NOx-Sensor 16 ausliest. Anschließend
wird in einem Schritt S2 am Abgasrückführventil 9 eine
im Speichermodul 17 voreingestellte Änderung der Abgasrückführrate
eingestellt; dies wird vom AGR-Modul 18 des Steuergerätes
10 vorgenommen. Die Änderung ist dabei so gewählt,
daß die Abgasrückführrate einen vorbestimmten Sprung von hoher
Abgasrückführrate auf kleine Abgasrückführrate, beispielsweise
von einem hohen Sollwert auf 0 %, durchführt.
Nach dieser Änderung der Abgasrückführrate wird wiederum über
den NOx-Sensor 16 die NOx-Konzentration im Abgas der Brennkraftmaschine
gemessen und als Wert NOx2 im Speichermodul 17
des Steuergeräts 10 gespeichert. Auch dies erfolgt wieder über
das Meßmodul 11 (Schritt S3). Dann wird in Schritt S4 überprüft,
ob die Differenz zwischen NOx1 und NOx2 einen ebenfalls
im Speichermodul 17 gespeicherten Schwellwert SW1 überschreitet.
Ist dies nicht der Fall (N-Verzweigung), wird
in einem Schritt S5 ein Fehler der Abgasrückführanlage (insbesondere
des Abgasrückführventils 9) festgestellt. Ansonsten
(J-Verzweigung) wird in Schritt S6 eine ordnungsgemäße Rückführanlage
diagnostiziert.First, in a step S1, a first NOx concentration
NOxl measured. This is done using the measuring
Anstelle der Differenzbildung der gemessenen NOx-Konzentration
in NOx1 und NOx2 in Schritt S4 kann als Wert
NOx1 auch ein in einem Modell ermittelte NOx-Konzentration
verwendet werden. Diese Modellermittlung erfolgt im NOx-Modellmodul
19 des Steuergerätes 10. Das NOx-Modellmodul 19
berechnet auf bekannte Weise die Rohemission an NOx im Abgas
der Brennkraftmaschine. Damit diese Modellberechnung möglichst
genau ausfällt, wird das Überprüfungsverfahren nur
durchgeführt, wenn der Kurbelwellensensor 13 anzeigt, daß die
Drehzahl der Kurbelwelle 15 und dabei der Brennkraftmaschine
innerhalb eines gewissen Fensters bleibt, vorzugsweise konstant
ist. Die Genauigkeit wird weiter gesteigert, wenn
zugleich auch die Last, d.h. die vom Luftmassenmesser 4 angezeigte,
in die Brennkraftmaschine strömende Luftmasse in bestimmten
Grenzen konstant ist.Instead of forming the difference between the measured NOx concentration
in NOx1 and NOx2 in step S4 can be as a value
NOx1 also a NOx concentration determined in a model
be used. This model is determined in the
Die Differenzbildung in Schritt S4 erfolgt dann zwischen der modellierten NOx-Konzentration und der gemessenen NOx-Konzentration NOx2 nach der Veränderung der Abgasrückführrate in Schritt S2. Der Schritt S1 kann in dieser Abwandlung entfallen, da nicht mehr die gemessene NOx-Konzentration NOx1, sondern ein modellierter Wert in Schritt S4 Eingang findet.The difference formation in step S4 then takes place between the modeled NOx concentration and the measured NOx concentration NOx2 after changing the exhaust gas recirculation rate in step S2. Step S1 can be omitted in this modification, since no longer the measured NOx concentration NOx1, but a modeled value is input in step S4.
Natürlich können die gespeicherten Werte (SW1, ...) auch betriebsparameterabhängig
gewählt werden. Das Speichermodul 17
enthält dann geeignete Kennfelder.Of course, the saved values (SW1, ...) can also depend on the operating parameters
to get voted. The
Bei einer Brennkraftmaschine mit NOx-Speicherkatalysator
stromauf des NOx-Sensors 16 werden vor Durchführung des Verfahrens
die in Figur 3 als Flußdiagramm dargestellten Schritte
durchgeführt. Zuerst wird in einem Schritt S7 die Abgasrückführrate
auf einen unter einem Schwellwert liegenden
Wert, in diesem Fall auf Null, gestellt. Dann wird in Schritt
S8 mittels des NOx-Sensors 16 die NOx-Konzentration gemessen
und als Wert NOx3 im Speichermodul 17 abgelegt. In Schritt S9
wird dann überprüft, ob der Wert NOx3 einen Schwellwert überschreitet.In an internal combustion engine with a NOx storage catalytic converter
are upstream of the
Ist dies nicht der Fall (N-Verzweigung), wird in Schritt S8 zurückgesprungen. Erst wenn die Abfrage in Schritt S9 zu einem positiven Ergebnis (J-Verzweigung) führt, ist der NOx-Speicherkatalysator in der Sättigung und ihm zugeführte NOx-Mengen schlagen zu seinem Ausgang durch. Dann wird in Schritt S10 die Abgasrückführrate auf einen hohen Wert, beipielsweise 100 % gesetzt, und es folgen die Verfahrensschritte der Figur 2.If this is not the case (N branch), step S8 jumps back. Only when the query in step S9 to a leads to a positive result (J-branching) is the NOx storage catalytic converter in saturation and NOx levels supplied to it punch through to its exit. Then in step S10 the exhaust gas recirculation rate to a high value, for example 100% set and the process steps of the figure follow Second
Claims (9)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10039952A DE10039952C2 (en) | 2000-08-16 | 2000-08-16 | Procedure for checking an exhaust gas recirculation system |
| DE10039952 | 2000-08-16 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1180594A2 true EP1180594A2 (en) | 2002-02-20 |
| EP1180594A3 EP1180594A3 (en) | 2003-01-02 |
| EP1180594B1 EP1180594B1 (en) | 2006-09-06 |
Family
ID=7652567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01118459A Expired - Lifetime EP1180594B1 (en) | 2000-08-16 | 2001-07-31 | Method for testing an exhaust gas recirculation system |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US6598470B2 (en) |
| EP (1) | EP1180594B1 (en) |
| DE (2) | DE10039952C2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112539121A (en) * | 2020-11-27 | 2021-03-23 | 潍柴动力股份有限公司 | Carbon deposition online detection method and detection device of EGR system and motor vehicle |
| CN114183260A (en) * | 2021-10-29 | 2022-03-15 | 东风商用车有限公司 | NOx control method in EGR failure mode |
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| JP2001304043A (en) * | 2000-04-20 | 2001-10-31 | Hitachi Ltd | Failure diagnosing device for exhaust gas re-circulation device |
| US6666201B1 (en) * | 2002-05-29 | 2003-12-23 | Ford Global Technologies, Llc | System and method for diagnosing EGR performance using NOx sensor |
| US7263823B2 (en) * | 2004-05-27 | 2007-09-04 | Cummins, Inc. | System for measuring NOx content of exhaust gas |
| US20090139210A1 (en) * | 2007-11-30 | 2009-06-04 | Rodrigo Lain Sanchez | Gas concentration sensor drift and failure detection system |
| DE102009029257B3 (en) * | 2009-09-08 | 2010-10-28 | Ford Global Technologies, LLC, Dearborn | Method for identification of deviations of fuel or airflow rate in internal combustion engine, involves determining nitrogen oxide extremes based on measured exhaust gas lambda value |
| KR20130063946A (en) * | 2011-12-07 | 2013-06-17 | 현대자동차주식회사 | Apparatus for diagnosing exhaust gas recirculation and method thereof |
| FR2999646B1 (en) * | 2012-12-18 | 2017-10-27 | Continental Automotive France | METHOD FOR DETERMINING THE RECYCLED AIR FLOW AND THE AVAILABLE OXYGEN QUANTITY AT THE INPUT OF A CYLINDER OF AN INTERNAL COMBUSTION ENGINE |
| CN111780903B (en) * | 2020-06-30 | 2022-03-15 | 东风商用车有限公司 | Butterfly type EGR valve motor torque characteristic measuring device and measuring method |
| US12017506B2 (en) | 2020-08-20 | 2024-06-25 | Denso International America, Inc. | Passenger cabin air control systems and methods |
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| US11932080B2 (en) | 2020-08-20 | 2024-03-19 | Denso International America, Inc. | Diagnostic and recirculation control systems and methods |
| US11760170B2 (en) | 2020-08-20 | 2023-09-19 | Denso International America, Inc. | Olfaction sensor preservation systems and methods |
| US11881093B2 (en) | 2020-08-20 | 2024-01-23 | Denso International America, Inc. | Systems and methods for identifying smoking in vehicles |
| US11813926B2 (en) | 2020-08-20 | 2023-11-14 | Denso International America, Inc. | Binding agent and olfaction sensor |
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- 2001-07-31 EP EP01118459A patent/EP1180594B1/en not_active Expired - Lifetime
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| DE3624441A1 (en) | 1986-07-19 | 1988-01-28 | Bosch Gmbh Robert | Diagnostic method for quantitative testing of actuators in internal-combustion engines |
| DE4216044A1 (en) | 1992-05-15 | 1993-11-18 | Bosch Gmbh Robert | Diagnosis system for IC engine with EGR - has diagnosis unit to establish difference in misfire frequencies between two positions of recirculation control valve |
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| CN112539121B (en) * | 2020-11-27 | 2022-03-01 | 潍柴动力股份有限公司 | Carbon deposition online detection method and detection device of EGR system and motor vehicle |
| CN114183260A (en) * | 2021-10-29 | 2022-03-15 | 东风商用车有限公司 | NOx control method in EGR failure mode |
| CN114183260B (en) * | 2021-10-29 | 2023-05-12 | 东风商用车有限公司 | NOx control method in EGR fault mode |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10039952A1 (en) | 2002-02-28 |
| DE50110924D1 (en) | 2006-10-19 |
| US20020033045A1 (en) | 2002-03-21 |
| EP1180594B1 (en) | 2006-09-06 |
| DE10039952C2 (en) | 2003-04-24 |
| EP1180594A3 (en) | 2003-01-02 |
| US6598470B2 (en) | 2003-07-29 |
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