EP0898065A2 - Method for establishing an operating characteristic of an internal combustion engine - Google Patents
Method for establishing an operating characteristic of an internal combustion engine Download PDFInfo
- Publication number
- EP0898065A2 EP0898065A2 EP98114352A EP98114352A EP0898065A2 EP 0898065 A2 EP0898065 A2 EP 0898065A2 EP 98114352 A EP98114352 A EP 98114352A EP 98114352 A EP98114352 A EP 98114352A EP 0898065 A2 EP0898065 A2 EP 0898065A2
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- Prior art keywords
- maximum
- internal combustion
- combustion engine
- ion current
- fuel
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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
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/021—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions using an ionic current sensor
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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
- F02D41/1454—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 oxygen content or concentration or the air-fuel ratio
- F02D41/1458—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 oxygen content or concentration or the air-fuel ratio with determination means using an estimation
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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]
- F02D41/0065—Specific aspects of external EGR control
- F02D41/0072—Estimating, calculating or determining the EGR rate, amount or flow
Definitions
- the present invention relates to methods for determining a Operating size of an internal combustion engine.
- the Fuel-air ratio in exhaust gas measured using lambda probes.
- Ion current measurements on spark plugs of an internal combustion engine are known. Such measurements are conventionally used for detection misfires and knocking engine operation.
- DE 35 06 114 A1 describes a method for controlling a Internal combustion engine with detection of ion currents known.
- ion current determined Measuring spectrum calculated and with a reference spectrum on a Computing unit compared, depending on the determined Deviation controlled a manipulated variable of the internal combustion engine becomes.
- a knock detector for a Internal combustion engine which the ion current over a Ignition coil detected at the time of combustion, and judged whether or whether the ion current is not above a predetermined level after a predetermined time or a crank angle the ignition is on.
- This device is used exclusively for Detection of knocking used.
- the amplitude of the ion current signal determines a fuel-air ratio of an internal combustion engine.
- the ion current signal is subject to strong cyclical fluctuations, so that a Averaging the ion current maxima over a large number of Cycles must be performed to the required accuracy to achieve the lambda measurement. Because of this Errors that arise in transient operation are procedures this type is not suitable for series production.
- the ion current amplitude depending on the type of fuel used, so that a detection to determine the actual lambda value the type of fuel is necessary.
- the object of the invention is therefore to create a method for determining an operating variable of an internal combustion engine, with which these can be reliably determined in a simple manner can.
- the method according to the invention it is possible to set the Operating variables of an internal combustion engine over relative to determine short cycles with sufficient accuracy.
- According to the invention becomes a measurement of a number of cycles of the ion current signal depending on the time performed. By Averaging these measurements can interfere, in particular Secondary maxima in the ion current signal, eliminated and the actual Main maximum and / or the time at which the main maximum occurs be determined.
- the respective company sizes can be determined in a simple manner. It is in particular a lambda detection during a Cold starts possible. Wear or aging of the sensor, as they can occur with conventional lambda probes be excluded now.
- With the method according to the invention is a cycle-resolved determination of the named company size possible. Furthermore, a determination of the above-mentioned operating parameters also possible when the engine is lean.
- the size of the company to be determined is expediently around the air-fuel ratio ⁇ (lambda ratio) of the internal combustion engine. It was found that the Time until the first maximum I1max of the ion current is reached not on the ionizability of the fuel, i.e. of the Type of fuel, but only by the turbulent burning speed depends. The turbulent burning speed is in turn depending on the laminar burning speed and the turbulence intensity. The laminar burning speed will determined by the fuel-air ratio ⁇ , the residual gas fraction, as well as the temperature and pressure of the mixture in the cylinder. There the temperature and pressure from the intake pressure and ignition timing are known, therefore, with a known exhaust gas recirculation rate Fuel-air ratio ⁇ can be determined.
- the first maximum I1max arises in the Flame core formation phase, in which the flame is still in the area of the Is spark plug. Ideally, the flame spreads spherically in the combustion chamber. Currents at the spark plug and above all Turbulence influences on the flame core lead to one Fissure of the flame.
- the first maximum I1max of the ion current signal is therefore not smooth, but has several secondary maxima. For an evaluation of the first maximum in the ion current signal it is therefore necessary to average over several cycles or to perform over a number of ignitions. Traditionally this was done for each ion current signal, i.e. with each ignition, the absolute maximum is determined. Of that determined values, the mean was formed. Because of the large fluctuations of the absolute maxima must Averaging the ion current maxima over a very large number of Cycles are performed to the required accuracy of the To achieve lambda measurement.
- the course of the ion current signal is now shown in Depends on the time over the entire area of the first Maximum determined. Those determined for several ignitions Waveforms are then averaged, resulting in a smoothed signal curve that eliminates the secondary maxima results from which an averaged maximum amplitude or Time of the averaged maximum amplitude in a simple manner is readable.
- This procedure can be used for adequate Accuracy required number of cycles compared to the conventional Procedures are greatly reduced. It is assumed, that there is sufficient accuracy of the lambda detection can be achieved with an averaging over 5 to 20 cycles.
- the speed of propagation depends the flame, and thus the time between ignition and reaching of the first maximum t1max from the turbulent burning speed from. As explained, it is from t1max with a known exhaust gas recirculation rate a determination of the air-fuel ratio, or a determination if the fuel-air ratio is known the exhaust gas recirculation rate possible.
- the time t1max until the first maximum in the ion current is reached is on the other hand of the ionizability of the fuel, which is influenced by the fuel quality or fuel additives becomes independent.
- the amplitude of the first maximum I1max of the ion current not only depends on the fuel-air ratio, but because of different ionizabilities different fuels also from the fuel quality and fuel additives.
- a Number of firings each time the maximum value of the Ion current signal determined.
- An averaging is then carried out the times of receipt determined for the respective maxima an averaged time. Based on this averaged At the point in time, as already explained above, it is possible the farm sizes in question with sufficient accuracy determine. This procedure can also be sufficient Achieve company size accuracies.
- the ion current signal is over an analog-digital converter AD line by line into a buffer Z loaded.
- the cache is preferably a dynamic buffer with shift register function for the respective ion current signals In-In-k.
- the buffer consists of a total of k lines with a first-in-first-out function (FIFO), in which ion current signals are stored are.
- FIFO first-in-first-out function
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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)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft Verfahren zur Bestimmung einer Betriebsgröße eines Verbrennungsmotors.The present invention relates to methods for determining a Operating size of an internal combustion engine.
Das Kraftstoff-Luft-Verhältnis eines Ottomotors muß bei Verwendung von Katalysatoren für die Abgasnachbehandlung konstant auf dem Wert λ = 1 gehalten werden. Zu diesem Zwecke wird das Kraftstoff-Luft-Verhältnis im Abgas über Lambda-Sonden gemessen.The fuel-air ratio of a gasoline engine must be used of catalysts for exhaust gas aftertreatment the value λ = 1 can be kept. For this purpose, the Fuel-air ratio in exhaust gas measured using lambda probes.
Ionenstrommessungen an Zündkerzen eines Verbrennungsmotors sind bekannt. Herkömmlicherweise werden derartige Messungen zur Erkennung von Zündaussetzern und klopfendem Motorbetrieb verwendet.Ion current measurements on spark plugs of an internal combustion engine are known. Such measurements are conventionally used for detection misfires and knocking engine operation.
Aus der DE 35 06 114 A1 ist ein Verfahren zur Steuerung einer Brennkraftmaschine mit Erfassung von Ionenströmen bekannt. Hierbei wird in Abhängigkeit von dem ermittelten Ionenstrom ein Meßspektrum berechnet und mit einem Bezugsspektrum auf einer Recheneinheit verglichen, worauf in Abhängigkeit der ermittelten Abweichung eine Stellgröße der Brennkraftmaschine gesteuert wird.DE 35 06 114 A1 describes a method for controlling a Internal combustion engine with detection of ion currents known. Here, depending on the ion current determined Measuring spectrum calculated and with a reference spectrum on a Computing unit compared, depending on the determined Deviation controlled a manipulated variable of the internal combustion engine becomes.
Aus der DE 40 37 943 A1 ist es bekannt, mittels einer Ionenstrommessung den Betriebszustand einer Brennkraftmaschine zu steuern. Gegenstand dieser Druckschrift ist jedoch die Vermeidung von Glühzündungen bzw. Motorklopfen. From DE 40 37 943 A1 it is known by means of an ion current measurement the operating state of an internal combustion engine Taxes. Avoidance is the subject of this publication of glow ignition or engine knock.
Ferner ist aus der DE 42 39 592 A1 ein Klopfdetektor für eine Brennkraftmaschine bekannt, welche den Ionenstrom über eine Zündspule zur Zeit der Verbrennung erfaßt, und beurteilt ob oder ob nicht der Ionenstrom oberhalb eines vorbestimmten Pegels nach einer vorbestimmten Zeit oder einem Kurbelwinkel seit der Zündung liegt. Diese Vorrichtung wird ausschließlich zur Feststellung eines Klopfens verwendet.Furthermore, from DE 42 39 592 A1 a knock detector for a Internal combustion engine known, which the ion current over a Ignition coil detected at the time of combustion, and judged whether or whether the ion current is not above a predetermined level after a predetermined time or a crank angle the ignition is on. This device is used exclusively for Detection of knocking used.
Es ist ferner bekannt,aus der Amplitude des Ionenstromsignals ein Kraftstoff-Luft-Verhältnis eines Verbrennungsmotors zu ermitteln. Hierbei stellt man jedoch fest, daß das Ionenstromsignal starken zyklischen Schwankungen unterworfen ist, so daß eine Mittelung der Ionenstrommaxima über eine große Anzahl von Zyklen durchgeführt werden muß, um die erforderliche Genauigkeit der Lambda-Messung zu erzielen. Aufgrund der hierdurch entstehenden Fehler im instationären Betrieb sind Verfahren dieser Art nicht serientauglich. Ferner ist die Ionenstromamplitude von der verwendeten Kraftstoffsorte abhängig, so daß zur Bestimmung des tatsächlichen Lambda-Wertes eine Erkennung der Kraftstoffsorte notwendig ist.It is also known from the amplitude of the ion current signal determine a fuel-air ratio of an internal combustion engine. Here, however, it is found that the ion current signal is subject to strong cyclical fluctuations, so that a Averaging the ion current maxima over a large number of Cycles must be performed to the required accuracy to achieve the lambda measurement. Because of this Errors that arise in transient operation are procedures this type is not suitable for series production. Furthermore, the ion current amplitude depending on the type of fuel used, so that a detection to determine the actual lambda value the type of fuel is necessary.
Aufgabe der Erfindung ist daher die Schaffung eines Verfahrens zur Bestimmung einer Betriebsgröße eines Verbrennungsmotors, mit dem diese in einfacher Weise zuverlässig ermittelt werden kann.The object of the invention is therefore to create a method for determining an operating variable of an internal combustion engine, with which these can be reliably determined in a simple manner can.
Diese Aufgabe wird gelöst durch ein Verfahren zur Bestimmung
einer Betriebsgröße eines Verbrennungsmotors gemäß dem Patentanspruch
1 oder dem Patentanspruch 2.This problem is solved by a method for determination
an operating size of an internal combustion engine according to the
Mit den erfindungsgemäßen Verfahren ist es möglich, die einzustellenden Betriebsgrößen eines Verbrennungsmotors über relativ kurze Zyklen mit ausreichender Genauigkeit zu ermitteln. Erfindungsgemäß wird eine Messung einer Anzahl von Zyklen des Ionenstromsignals in Abhängigkeit von der Zeit durchgeführt. Durch Mittelung dieser Messungen können Störeinflüsse, insbesondere Nebenmaxima im Ionenstromsignal, eliminiert und das eigentliche Hauptmaximum und/oder der Zeitpunkt des Auftretens des Hauptmaximums bestimmt werden. Auf der Grundlage dieser Daten lassen sich die jeweiligen Betriebsgrößen in einfacher Weise ermitteln. Es ist insbesondere eine Lambda-Erkennung während eines Kaltstarts möglich. Ein Verschleiß oder eine Alterung des Sensors, wie sie bei herkömmlichen Lambda-Sonden auftraten, können nun ausgeschlossen werden. Mit den erfindungsgemäßen Verfahren ist eine zyklusaufgelöste Bestimmung der genannten Betriebsgröße möglich. Ferner ist eine Ermittlung der genannten Betriebsgrößen auch im Magerbetrieb des Motors möglich.With the method according to the invention it is possible to set the Operating variables of an internal combustion engine over relative to determine short cycles with sufficient accuracy. According to the invention becomes a measurement of a number of cycles of the ion current signal depending on the time performed. By Averaging these measurements can interfere, in particular Secondary maxima in the ion current signal, eliminated and the actual Main maximum and / or the time at which the main maximum occurs be determined. Let on the basis of this data the respective company sizes can be determined in a simple manner. It is in particular a lambda detection during a Cold starts possible. Wear or aging of the sensor, as they can occur with conventional lambda probes be excluded now. With the method according to the invention is a cycle-resolved determination of the named company size possible. Furthermore, a determination of the above-mentioned operating parameters also possible when the engine is lean.
Vorteilhafte Ausführungsformen sind Gegenstand der Unteransprüche.Advantageous embodiments are the subject of the dependent claims.
Zweckmäßigerweise handelt es sich bei der zu bestimmenden Betriebsgröße um das Kraftstoff-Luft-Verhältnis λ (Lambda-Verhältnis) des Verbrennungsmotors. Es wurde festgestellt, daß die Zeit bis zum Erreichen des ersten Maximums I1max des Ionenstroms nicht von der Ionisierbarkeit des Kraftstoffs, d.h. der Art des Kraftstoffs, sondern nur von der turbulenten Brenngeschwindigkeit abhängt. Die turbulente Brenngeschwindigkeit ist ihrerseits abhängig von der laminaren Brenngeschwindigkeit und der Turbulenzintensität. Die laminare Brenngeschwindigkeit wird bestimmt durch das Kraftstoff-Luft-Verhältnis λ, den Restgasanteil, sowie Temperatur und Druck des Gemisches im Zylinder. Da aus Ansaugdruck und Zündzeitpunkt die Temperatur und der Druck bekannt sind, kann daher bei bekannter Abgasrückführrate das Kraftstoff-Luft-Verhältnis λ ermittelt werden.The size of the company to be determined is expediently around the air-fuel ratio λ (lambda ratio) of the internal combustion engine. It was found that the Time until the first maximum I1max of the ion current is reached not on the ionizability of the fuel, i.e. of the Type of fuel, but only by the turbulent burning speed depends. The turbulent burning speed is in turn depending on the laminar burning speed and the turbulence intensity. The laminar burning speed will determined by the fuel-air ratio λ, the residual gas fraction, as well as the temperature and pressure of the mixture in the cylinder. There the temperature and pressure from the intake pressure and ignition timing are known, therefore, with a known exhaust gas recirculation rate Fuel-air ratio λ can be determined.
Es ist ebenfalls möglich, unter Berücksichtigung der oben erläuterten Abhängigkeiten bei bekannten Kraftstoff-Luft-Verhältnis die Abgasrückführrate zu bestimmen.It is also possible considering the above Dependencies with known fuel-air ratio to determine the exhaust gas recirculation rate.
Es ist bevorzugt, die erfindungsgemäßen Messungen an verschiedenen Zylindern bzw. Zündkerzen durchzuführen. Hierdurch ist eine zylinderselektive Lambda-Erkennung bei Mehrzylindermotoren in einfacher Weise durchführbar.It is preferred to carry out the measurements according to the invention on various Cylinders or spark plugs. This is cylinder-selective lambda detection in multi-cylinder engines can be carried out in a simple manner.
Die Erfindung wird nun anhand der beigefügten Zeichnung im einzelnen
erläutert. In dieser zeigt
Wie in Figur 1 dargestellt, besitzt ein Ionenstromsignal an der Zündkerze einen charakteristischen Verlauf, der zwei wesentliche Maxima enthält. Das erste Maximum I1max ensteht in der Flammkernbildungsphase, in der die Flamme noch im Bereich der Zündkerze ist. Idealerweise breitet sich die Flamme kugelförmig im Brennraum aus. Strömungen an der Zündkerze und vor allem Turbulenzeinflüsse auf den Flammkern führen jedoch zu einer Zerklüftung der Flamme. Das erste Maximum I1max des Ionenstromsignals ist daher nicht glatt, sondern besitzt mehrere Nebenmaxima. Für eine Auswertung des ersten Maximums im Ionenstromsignal ist es somit erforderlich, eine Mittelung über mehrere Zyklen bzw. über eine Anzahl von Zündungen durchzuführen. Herkömmlicherweise wurde hierzu für jedes Ionenstromsignal, d.h. bei jeder Zündung, das absolute Maximum ermittelt. Von den so ermittelten Werten wurde der Mittelwert gebildet. Wegen der großen Schwankungsbeite der absoluten Maxima muß hierbei die Mittelung der Ionenstrommaxima über eine sehr große Anzahl von Zyklen durchgeführt werden, um die geforderte Genauigkeit der Lambda-Messung zu erreichen.As shown in Figure 1, has an ion current signal at the Spark plug a characteristic course, the two essential Contains maxima. The first maximum I1max arises in the Flame core formation phase, in which the flame is still in the area of the Is spark plug. Ideally, the flame spreads spherically in the combustion chamber. Currents at the spark plug and above all Turbulence influences on the flame core lead to one Fissure of the flame. The first maximum I1max of the ion current signal is therefore not smooth, but has several secondary maxima. For an evaluation of the first maximum in the ion current signal it is therefore necessary to average over several cycles or to perform over a number of ignitions. Traditionally this was done for each ion current signal, i.e. with each ignition, the absolute maximum is determined. Of that determined values, the mean was formed. Because of the large fluctuations of the absolute maxima must Averaging the ion current maxima over a very large number of Cycles are performed to the required accuracy of the To achieve lambda measurement.
Erfindungsgemäß wird nun der Verlauf des Ionenstromsignals in Abhängigkeit von der Zeit über den gesamten Bereich des ersten Maximums ermittelt. Die für mehrere Zündungen derart ermittelten Signalverläufe werden anschließend gemittelt, wodurch sich ein geglätteter, die Nebenmaxima eliminierender Signalverlauf ergibt, aus dem eine gemittelte maximale Amplitude bzw. der Zeitpunkt der gemittelten maximalen Amplitude in einfacher Weise ablesbar ist. Mit diesem Verfahren kann die für eine ausreichende Genauigkeit notwendige Zyklenzahl gegenüber den herkömmlichen Verfahren stark vermindert werden. Es wird davon ausgegangen, daß sich genügende Genauigkeiten der Lambda-Erkennung schon bei einer Mittelung über 5 bis 20 Zyklen erreichen lassen.According to the invention, the course of the ion current signal is now shown in Depends on the time over the entire area of the first Maximum determined. Those determined for several ignitions Waveforms are then averaged, resulting in a smoothed signal curve that eliminates the secondary maxima results from which an averaged maximum amplitude or Time of the averaged maximum amplitude in a simple manner is readable. This procedure can be used for adequate Accuracy required number of cycles compared to the conventional Procedures are greatly reduced. It is assumed, that there is sufficient accuracy of the lambda detection can be achieved with an averaging over 5 to 20 cycles.
Es wurde festgestellt, daß der Zeitpunkt der gemittelten maximalen Amplitude t1max für die Bestimmung des Kraftstoff-Luft-Verhältnisses bzw. der Ahgasrückführrate ein geeigneter Parameter ist, anhand dessen ausreichende Genauigkeiten für eine effektive Steuerung des Verbrennungsmotors erzielbar sind.It was found that the time of the averaged maximum Amplitude t1max for the determination of the air-fuel ratio a suitable parameter is sufficient accuracy for an effective Control of the internal combustion engine can be achieved.
Wie bereits erläutert, hängt die Ausbreitungsgeschwindigkeit der Flamme, und damit die Zeit zwischen Zündung und Erreichen des ersten Maximums t1max von der turbulenten Brenngeschwindigkeit ab. Es ist, wie erläutert, aus t1max bei bekannter Abgasrückführrate eine Bestimmung des Kraftstoff-Luft-Verhältnisses, oder bei bekanntem Kraftstoff-Luft-Verhältnis eine Bestimmung der Abgasrückführrate möglich.As already explained, the speed of propagation depends the flame, and thus the time between ignition and reaching of the first maximum t1max from the turbulent burning speed from. As explained, it is from t1max with a known exhaust gas recirculation rate a determination of the air-fuel ratio, or a determination if the fuel-air ratio is known the exhaust gas recirculation rate possible.
Die Zeit t1max bis zum Erreichen des ersten Maximums im Ionenstrom ist hingegen von der Ionisierbarkeit des Kraftstoffes, welche von der Kraftstoffqualität bzw. Kraftstoffadditiven beeinflußt wird, unabhängig. Die Amplitude des ersten Maximums I1max des Ionenstroms hängt jedoch nicht nur vom Kraftfstoff-Luft-Verhältnis, sondern aufgrund unterschiedlicher Ionisierbarkeiten verschiedener Kraftstoffe auch von der Kraftstoffqualität und Kraftstoffadditiven ab.The time t1max until the first maximum in the ion current is reached is on the other hand of the ionizability of the fuel, which is influenced by the fuel quality or fuel additives becomes independent. The amplitude of the first maximum I1max of the ion current not only depends on the fuel-air ratio, but because of different ionizabilities different fuels also from the fuel quality and fuel additives.
Obwohl es ausreichend ist, zur Bestimmung der genannten Betriebsgrößen den Zeitpunkt des gemittelten Signalmaximums festzustellen, erweist es sich als vorteilhaft, gleichzeitig auch den tatsächlichen Wert des Maximums zu berechnen. Dieser Amplitudenwert ist zwar, wie erläutert, abhängig von dem verwendeten Kraftstoff, doch kann unter Berücksichtigung der maximalen Amplitude als auch des Zeitpunkts der maximalen Amplitude eine Steigung des Ionenstromsignalverlaufs berechnet werden, aus welcher in besonders einfacher Weise, insbesondere bei bekanntem Kraftstoff, das Kraftstoff-Luft-Verhältnis bzw. die Abgasrückführrate berechnet werden kann. Auf der Grundlage des Signalmaximums bzw. des maximalen Amplitudenwertes läßt sich, insbesondere unter Berücksichtigung der ermittelten Steigung des Ionenstromsignals, auch die Kraftstoffqualität ermitteln. Bei bekannter Kraftstoffqualität ist es auch möglich, lediglich aufgrund des Signalmaximums des gemittelten Signalverlaufs die gewünschten Betriebsgrößen zu ermitteln.Although it is sufficient to determine the sizes mentioned determine the time of the averaged signal maximum, it turns out to be beneficial at the same time to calculate the actual value of the maximum. This amplitude value is, as explained, dependent on the one used Fuel, however, can take into account the maximum Amplitude as well as the time of maximum amplitude one Slope of the ion current waveform are calculated from which in a particularly simple manner, especially in the known Fuel, the fuel-air ratio or the exhaust gas recirculation rate can be calculated. Based on the signal maximum or the maximum amplitude value can be especially taking into account the determined slope of the ion current signal, also determine the fuel quality. If the fuel quality is known, it is also possible based on the signal maximum of the averaged signal curve to determine the desired operating sizes.
Gemäß dem weiteren erfindungsgemäßen Verfahren wird für eine Anzahl von Zündungen jeweils der Zeitpunkt des Maximalwerts des Ionenstromsignals bestimmt. Anschließend erfolgt eine Mittelung der für die jeweiligen Maxima ermittelten Zeitpunkte zum Erhalt eines gemittelten Zeitpunktes. Auf der Grundlage dieses gemittelten Zeitpunktes ist es, wie oben bereits erläutert, möglich, die fraglichen Betriebsgrößen mit ausreichender Genauigkeit zu bestimmen. Auch durch dieses Verfahren lassen sich ausreichende Genauigkeiten der Betriebsgrößen erreichen.According to the further method according to the invention, a Number of firings each time the maximum value of the Ion current signal determined. An averaging is then carried out the times of receipt determined for the respective maxima an averaged time. Based on this averaged At the point in time, as already explained above, it is possible the farm sizes in question with sufficient accuracy determine. This procedure can also be sufficient Achieve company size accuracies.
Es sei angemerkt, daß das im dargestellten Ionenstromsignal auftretende zweite Maximum I2max durch eine Druckerhöhung im Zylinder aufgrund der Verbrennung entsteht. Die Flamme hat sich hierbei von der Zündkerze gelöst, und die elektrische Leitfähigkeit entsteht durch die Restionisierung des verbrannten Gemischs. Das zweite Maximum im Ionenstromsignal ist glatt, da der Einfluß der Flammenentfaltung nicht mehr an der Zündkerze wirksam ist. Das zweite Maximum I2max spielt jedoch im vorliegenden Zusammenhang zur Bestimmung des Kraftstoff-Luft-Verhältnisses bzw. der übrigen genannten Betriebsgrößen keine Rolle.It should be noted that that in the ion current signal shown occurring second maximum I2max due to an increase in pressure in the Cylinder is created due to the combustion. The flame has gone detached from the spark plug, and the electrical conductivity arises from the restionization of the burned mixture. The second maximum in the ion current signal is smooth because the influence of the flame development no longer on the spark plug is effective. However, the second maximum I2max plays here Relationship to the determination of the fuel-air ratio or the other company sizes mentioned none Role.
Eine Ausführungsmöglichkeit der erfindungsgemäßen Verfahren ist in Figur 2 dargestellt. Hierbei wird das Ionenstromsignal über einen Analog-Digital-Wandler AD zeilenweise in einen Zwischenspeicher Z geladen. Bei dem Zwischenspeicher handelt es sich vorzugsweise um einen dynamischen Zwischenspeicher mit Schieberegisterfunktion für die jeweiligen Ionenstromsignale In-In-k. Der Zwischenspeicher besteht aus insgesamt k Zeilen mit first-in-first-out-Funktion (FIFO), in denen Ionenstromsignale abgespeichert sind. Bevor das n-te Ionenstromsignal eingelesen wird, sind die zuvor eingelesenen Ionenstromsignale um eine Zeile verschoben worden. Nach dem Einlesen des aktuellen Ionenstromsignals wird spaltenweise ein gemitteltes Ionenstromsignal über k Zeilen berechnet. Dies ergibt das gemittelte Ionenstromsignal der letzten k Zyklen. Aus diesem gemittelten Ionenstromsignal erfolgt die Berechnung des Maximums I1max bzw. des Zeitpunkts dieses Maximums, t1max.One possible embodiment of the method according to the invention is shown in Figure 2. Here, the ion current signal is over an analog-digital converter AD line by line into a buffer Z loaded. The cache is preferably a dynamic buffer with shift register function for the respective ion current signals In-In-k. The buffer consists of a total of k lines with a first-in-first-out function (FIFO), in which ion current signals are stored are. Before the nth ion current signal is read in the previously read ion current signals are one Line has been moved. After reading in the current ion current signal becomes an averaged ion current signal in columns calculated over k lines. This gives the averaged ion current signal of the last k cycles. From this averaged ion current signal the maximum I1max or the time is calculated of this maximum, t1max.
Claims (4)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19735454 | 1997-08-16 | ||
| DE19735454A DE19735454A1 (en) | 1997-08-16 | 1997-08-16 | Method for determining an operating variable of an internal combustion engine |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0898065A2 true EP0898065A2 (en) | 1999-02-24 |
| EP0898065A3 EP0898065A3 (en) | 2000-11-22 |
| EP0898065B1 EP0898065B1 (en) | 2003-09-03 |
Family
ID=7839102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98114352A Expired - Lifetime EP0898065B1 (en) | 1997-08-16 | 1998-07-30 | Method for establishing an operating characteristic of an internal combustion engine |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US6125691A (en) |
| EP (1) | EP0898065B1 (en) |
| DE (2) | DE19735454A1 (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19849115C2 (en) * | 1998-10-24 | 2000-10-12 | Daimler Chrysler Ag | Method for recognizing the quality of fuel for internal combustion engines |
| DE19911019C2 (en) | 1999-03-12 | 2001-02-08 | Daimler Chrysler Ag | Method for determining the air / fuel ratio in a combustion chamber of an internal combustion engine |
| DE19924500C1 (en) * | 1999-05-28 | 2000-08-24 | Daimler Chrysler Ag | Operating method for gas-fuelled combustion engine, controlling combustion processes in dependence on gas quality of conveyed fuel gas |
| DE10011614A1 (en) * | 2000-03-10 | 2001-09-13 | Delphi Tech Inc | Procedure for determining commencement of combustion in cylinder in internal combustion engine entails forming difference between last calculated average value and last stored value and comparing this with threshold value |
| JP3579404B2 (en) * | 2002-05-27 | 2004-10-20 | 三菱電機株式会社 | Misfire detection device for internal combustion engine |
| EP1435445A1 (en) * | 2002-12-30 | 2004-07-07 | Ford Global Technologies, Inc., A subsidiary of Ford Motor Company | Internal combustion engine, method for auto-ignition operation and computer readable storage device |
| US6910449B2 (en) * | 2002-12-30 | 2005-06-28 | Ford Global Technologies, Llc | Method for auto-ignition operation and computer readable storage device for use with an internal combustion engine |
| DE102004041230A1 (en) * | 2004-08-26 | 2006-03-02 | Volkswagen Ag | Cylinder equalization method using ionic flow measurement for combustion engine, involves comparing determined average values of specific cylinders and average values of specific cylinder groups to identify cylinder and its operation mode |
| DE102007021283A1 (en) * | 2007-05-07 | 2008-11-13 | Continental Automotive Gmbh | Method and device for determining the combustion lambda value of an internal combustion engine |
| JP4462315B2 (en) * | 2007-09-24 | 2010-05-12 | 株式会社デンソー | Internal combustion engine control device |
| US10774773B2 (en) * | 2011-01-28 | 2020-09-15 | Wayne State University | Autonomous operation of electronically controlled internal combustion engines on a variety of fuels and/or other variabilities using ion current and/or other combustion sensors |
| DE112012007032T5 (en) * | 2011-07-20 | 2015-07-30 | Cmte Development Limited | Funkenprüfvorrichtung |
| ITRE20110060A1 (en) | 2011-08-02 | 2013-02-03 | Emak Spa | "CARBURETION CONTROL SYSTEM" |
| JP5753142B2 (en) | 2012-09-19 | 2015-07-22 | 本田技研工業株式会社 | Combustion control device for internal combustion engine and method for burning homogeneous lean mixture |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3506114A1 (en) | 1985-02-22 | 1986-09-04 | Robert Bosch Gmbh, 7000 Stuttgart | Method for controlling an internal combustion engine in an open-loop or closed-loop fashion |
| DE4037943A1 (en) | 1990-11-29 | 1992-06-04 | Bayerische Motoren Werke Ag | Combustion engine operation with individual cylinder fuel injection - introducing temporary inhibition of supply to cylinder showing excessive antiknock ignition retardation or preignition ionisation |
| DE4239592A1 (en) | 1991-11-26 | 1993-05-27 | Mitsubishi Electric Corp |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT386256B (en) * | 1984-07-02 | 1988-07-25 | Atlas Fahrzeugtechnik Gmbh | ARRANGEMENT FOR GENERATING A TRIGGER PULSE FOR THE IGNITION OF AN INTERNAL COMBUSTION ENGINE |
| JP2909345B2 (en) * | 1993-03-23 | 1999-06-23 | 三菱電機株式会社 | Internal combustion engine control device |
| JPH07293315A (en) * | 1994-04-27 | 1995-11-07 | Daihatsu Motor Co Ltd | Air-fuel ratio detecting method |
| SE503900C2 (en) * | 1995-01-18 | 1996-09-30 | Mecel Ab | Method and system for monitoring internal combustion engines by detecting the actual air-fuel mixing ratio |
| US5803047A (en) * | 1995-10-19 | 1998-09-08 | Mecel Ab | Method of control system for controlling combustion engines |
| JPH09324690A (en) * | 1996-06-03 | 1997-12-16 | Mitsubishi Electric Corp | Internal combustion engine control device |
| JP3205512B2 (en) * | 1996-09-05 | 2001-09-04 | トヨタ自動車株式会社 | Device for detecting combustion state of internal combustion engine |
| JP3662364B2 (en) * | 1996-09-27 | 2005-06-22 | トヨタ自動車株式会社 | Internal combustion engine knock detection device |
| US6029627A (en) * | 1997-02-20 | 2000-02-29 | Adrenaline Research, Inc. | Apparatus and method for controlling air/fuel ratio using ionization measurements |
-
1997
- 1997-08-16 DE DE19735454A patent/DE19735454A1/en not_active Withdrawn
-
1998
- 1998-07-30 DE DE59809469T patent/DE59809469D1/en not_active Expired - Fee Related
- 1998-07-30 EP EP98114352A patent/EP0898065B1/en not_active Expired - Lifetime
- 1998-08-14 US US09/134,485 patent/US6125691A/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3506114A1 (en) | 1985-02-22 | 1986-09-04 | Robert Bosch Gmbh, 7000 Stuttgart | Method for controlling an internal combustion engine in an open-loop or closed-loop fashion |
| DE4037943A1 (en) | 1990-11-29 | 1992-06-04 | Bayerische Motoren Werke Ag | Combustion engine operation with individual cylinder fuel injection - introducing temporary inhibition of supply to cylinder showing excessive antiknock ignition retardation or preignition ionisation |
| DE4239592A1 (en) | 1991-11-26 | 1993-05-27 | Mitsubishi Electric Corp |
Also Published As
| Publication number | Publication date |
|---|---|
| US6125691A (en) | 2000-10-03 |
| EP0898065A3 (en) | 2000-11-22 |
| EP0898065B1 (en) | 2003-09-03 |
| DE19735454A1 (en) | 1999-02-18 |
| DE59809469D1 (en) | 2003-10-09 |
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