WO2008083989A1 - Method for controlling the injection quantity on an injection nozzle - Google Patents
Method for controlling the injection quantity on an injection nozzle Download PDFInfo
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- WO2008083989A1 WO2008083989A1 PCT/EP2008/000195 EP2008000195W WO2008083989A1 WO 2008083989 A1 WO2008083989 A1 WO 2008083989A1 EP 2008000195 W EP2008000195 W EP 2008000195W WO 2008083989 A1 WO2008083989 A1 WO 2008083989A1
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- Prior art keywords
- injection
- correction function
- injection quantity
- exhaust gas
- ballistic
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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
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2425—Particular ways of programming the data
- F02D41/2429—Methods of calibrating or learning
- F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
- F02D41/2464—Characteristics of actuators
- F02D41/2467—Characteristics of actuators for injectors
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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
- F02D41/1446—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 exhaust temperatures
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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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
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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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
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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
Definitions
- the present invention relates to a method for controlling an injection quantity at an injection nozzle of a force injection device according to the preamble of claim 1.
- DE 39 14 264 C1 discloses a method for regulating the injection quantity at a magnetically controlled fuel injection device for air-compressing, self-igniting and multi-cylinder internal combustion engines consisting of a pump and nozzle, in which values of rotational speed, load and exhaust gas temperature determined by sensors are obtained and stored in an electronic control unit are processed to output signals for the control of a standing with the injector in operative connection solenoid valve.
- the exhaust gas temperature of each cylinder of the internal combustion engine is measured, the respective actual value of this exhaust gas temperature compared with the stored in a map memory setpoint of the previously determined exhaust gas temperature and readjusted in deviation, the injection quantity by changing the driving time of the solenoid valve to the desired value.
- the invention is concerned with the problem of further developing a generic method such that an injection quantity at an injection nozzle can be set particularly precisely and, moreover, a degree of coking at the injection nozzles can be easily determined.
- the invention is based on the general idea of determining a correction function in a non-ballistic region of a fuel injection, which proceeds linearly and thereby enables an interpolation of intermediate values without problems.
- the linear correction function is used to control the injection quantity at the at least one injection nozzle in the non-ballistic region, wherein the correction function is formed from a straight line defined by two points.
- a first point of the linear correction function is characterized by a predefined transition of a ballistic nozzle needle movement into a non-ballistic stroke stop, while a measurement of the exhaust gas temperature is used to determine the second point.
- the measured exhaust gas temperature can be determined with the aid of a fuel injection quantity function, which is combined with the
- Exhaust gas temperature function correlated a deviation of an actual injection amount of a desired injection quantity can be determined. For the correction of the injection quantity must therefore by the difference value determined from this be readjusted.
- Associated exhaust gas temperature values are assigned to the individual functional values of the desired injection quantity function, which also applies to the correction function. From the differences between target exhaust gas temperatures and actual exhaust gas temperatures can thus be easily associated
- the measured difference between the injection quantity and the actual injection quantity can be used a defined exhaust gas temperature to a degree of coking of the injection nozzle are closed, since with increasing coking a cross section of the injection nozzle is reduced and less fuel can be transported through the injection nozzle.
- the cross section of the injection nozzle is the only variable value in this equation, it can be directly deduced from the reduced injection quantity on a change in the cross section of the injection nozzle and thus indirectly on a degree of coking thereof.
- Fig. 1 shows a graph with different gradients of an injection quantity as a function of a drive time.
- FIG. 1 a total of three courses 1, 2 and 3 are shown, whereby the course 1 arises at a control pressure of 2000 bar, while the course 2 occurs at 800 bar and the course 3 at 250 bar injection pressure.
- the injection quantity is plotted in cubic millimeters, while the abscissa represents a drive duration in milliseconds.
- the courses 1, 2 and 3 so for example from a control period of> 0.5 ms results in a substantially linear course of the different curves 1, 2 and 3, which substantially according to the context
- the injection quantity is thus proportionally dependent on a cross-section A of an injection nozzle, not shown, wherein the cross-sectional area A of the injection nozzle due to of so-called coking processes can decrease over time and thereby decreases the injection quantity under otherwise identical conditions.
- the curves 1, 2 and 3 correlate with respect to their course with an exhaust gas temperature, so that each exhaust gas temperature can be assigned a specific injection quantity directly.
- at least one sensor is now provided, which determines an exhaust gas temperature and transmits it to an electronic control unit, not shown, in which the obtained sensor signal is processed into at least one output signal for controlling the fuel injection device.
- a linear correction function 4 is used, the function values of the correction function being compared with the function values of a fuel injection quantity function for the purpose of correcting the injection quantity.
- the correction function 4 is formed by at least two points 5 and 6, wherein the first point 5 of the linear correction function 4 is characterized by a predefined transition of a ballistic nozzle needle movement in a non-ballistic stroke stop, while for the determination of the second point 6, a measurement of the exhaust gas temperature is used. Since the exhaust gas temperature correlates with a respectively associated injection quantity, the correction function 4 can also be used to determine an actual injection quantity.
- this actual injection quantity is smaller than the setpoint injection quantity, this may merely be due to a reduction in cross-section due to the linear relationship according to the equation shown above, with otherwise unchanged parameters.
- Such Cross-sectional reduction can be present, for example, due to coking of a spray hole of the injection nozzle, with increasing coking the spray hole diameter steadily decreases.
- the first point 5 of the linear correction function 4 is firmly defined for a respective injector design.
- the point 6 or the change in quantity at this point is determined by measuring the exhaust gas temperature at this point by measuring a temperature sensor, in particular a T3 sensor.
- the straight line spanned between the two points 5 and 6 thus permits injection quantity correction at arbitrary intermediate points, wherein the correction function 4 can be carried out for different rail pressures by means of corresponding exhaust-gas temperature measurements along a full-load characteristic curve.
- a measurement of the exhaust gas temperature under full load is used for the determination of the second point 6 of the correction function 4.
- the determination of the correction function 4 takes place during normal operation of the internal combustion engine or in a separate learning mode.
- both a main injection quantity and a pilot injection quantity or a post-injection quantity or any desired combinations can be regulated.
- further support points 7 can be provided between the two points 5 and 6, by means of which the correction function 4 can be represented in even greater detail.
- a correction function 4 is set up, which runs substantially linearly and which is spanned between two points 5 and 6.
- the point 5 is the transition between the ballistic and the non-ballistic area, while the point 6 is determined by means of a temperature sensor which measures an exhaust gas temperature of the internal combustion engine.
- the hatched in FIG. 1 area in the course 1 shows, for example, the decrease of an injection amount .DELTA.E, which is based on otherwise reducing the cross-section A of the injector with otherwise identical parameters.
- An initial injection quantity with the injector cross section fully open is approximately 66 mm 3 for a control period of 1 ms.
- the injection quantity Due to the reduction in the cross-section A of the injection nozzle, the injection quantity is reduced by ⁇ E ⁇ 2.5, so that with the same drive duration due to the reduced injector cross-section A only an injection quantity of 63.5 mm 3 is injected.
- the activation duration must therefore be extended by 0.05 ms. This extended activation time is calculated by the control unit and converted into a corresponding control signal.
- the coefficient ⁇ E can also be used to determine a degree of coking of the injection nozzle, which is expressed in the cross-sectional reduction of the injection nozzle.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention relates to a method for controlling an injection quantity on an injection nozzle of a fuel injection device for an internal combustion engine. The invention is characterized in that a linear correction function (4) is used in a non-ballistic range in order to control the injection quantity on the injection nozzle, the linear correction function (4) being defined by at least two points (5, 6). The first point (5) of the linear correction function (4) is characterized by a predefined conversion of a ballistic injection needle movement to a non-ballistic stroke while a measurement of the exhaust gas temperature is used to determine the second point (6).
Description
Verfahren zur Regelung einer Einspritzmenge an einer Method for controlling an injection quantity at a
Einspritzdüseinjection
Die vorliegende Erfindung betrifft ein Verfahren zur Regelung einer Einspritzmenge an einer Einspritzdüse einer Krafteinspritzeinrichtung gemäß dem Oberbegriff des Anspruchs 1.The present invention relates to a method for controlling an injection quantity at an injection nozzle of a force injection device according to the preamble of claim 1.
Aus der DE 39 14 264 Cl ist ein Verfahren zum Regeln der Einspritzmenge an einer aus Pumpe und Düse bestehenden magnetventiIgesteuerten KraftStoffeinspritzeinrichtung für luftverdichtende, selbstzündende und mehrzylindrige Brennkraftmaschinen bekannt, bei dem von Sensoren ermittelte Werte von Drehzahl, Last und Abgastemperatur gewonnen und in einem elektronischen Steuergerät zu Ausgangssignalen für die Ansteuerung eines mit der Einspritzdüse in Wirkverbindung stehenden Magnetventils verarbeitet werden. Dabei wird die Abgastemperatur jedes Zylinders der Brennkraftmaschine gemessen, der jeweilige Ist-Wert dieser Abgastemperatur mit dem in einem Kennfeldspeicher abgelegten Sollwert der vorab ermittelten Abgastemperatur verglichen und bei Abweichung die Einspritzmenge durch Änderung der Ansteuerzeit des Magnetventils auf den Sollwert nachgeregelt. Hierdurch kann die Einspritzmenge jedes einzelnen Zylinders während des Betriebs der Brennkraftmaschine geändert und somit Mengenstreuungen von Zylinder zu Zylinder ausgeregelt werden.
Die Erfindung beschäftigt sich mit dem Problem, ein gattungsgemäßes Verfahren dahingehend weiterzuentwickeln, dass sich eine Einspritzmenge an einer Einspritzdüse besonders genau einstellen lässt und darüber hinaus ein Verkokungsgrad an den Einspritzdüsen leicht zu ermitteln ist.DE 39 14 264 C1 discloses a method for regulating the injection quantity at a magnetically controlled fuel injection device for air-compressing, self-igniting and multi-cylinder internal combustion engines consisting of a pump and nozzle, in which values of rotational speed, load and exhaust gas temperature determined by sensors are obtained and stored in an electronic control unit are processed to output signals for the control of a standing with the injector in operative connection solenoid valve. In this case, the exhaust gas temperature of each cylinder of the internal combustion engine is measured, the respective actual value of this exhaust gas temperature compared with the stored in a map memory setpoint of the previously determined exhaust gas temperature and readjusted in deviation, the injection quantity by changing the driving time of the solenoid valve to the desired value. As a result, the injection quantity of each individual cylinder can be changed during operation of the internal combustion engine and thus quantity variations from cylinder to cylinder can be compensated. The invention is concerned with the problem of further developing a generic method such that an injection quantity at an injection nozzle can be set particularly precisely and, moreover, a degree of coking at the injection nozzles can be easily determined.
Gelöst wird dieses Problem durch den Gegenstand des unabhängigen Anspruches 1.This problem is solved by the subject matter of independent claim 1.
Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche .Advantageous embodiments are the subject of the dependent claims.
Die Erfindung beruht auf dem allgemeinen Gedanken, in einem nicht ballistischen Bereich einer Kraftstoffeinspritzung eine Korrekturfunktion zu ermitteln, welche linear verläuft und dadurch eine Interpolation von Zwischenwerten problemlos ermöglicht. Die lineare Korrekturfunktion wird dabei zur Regelung der Einspritzmenge an der zumindest einen Einspritzdüse im nicht ballistischen Bereich verwendet, wobei die Korrekturfunktion aus einer durch zwei Punkte gelegten Gerade gebildet wird. Ein erster Punkt der linearen Korrekturfunktion ist dabei durch einen vordefinierten Übergang einer ballistischen Düsennadelbewegung in einen nicht ballistischen Hubanschlag charakterisiert, während für die Bestimmung des zweiten Punktes eine Messung der Abgastemperatur herangezogen wird. Über die gemessene Abgastemperatur kann unter Zuhilfenahme einer SoIl- Einspritzmengenfunktion, welche mit derThe invention is based on the general idea of determining a correction function in a non-ballistic region of a fuel injection, which proceeds linearly and thereby enables an interpolation of intermediate values without problems. The linear correction function is used to control the injection quantity at the at least one injection nozzle in the non-ballistic region, wherein the correction function is formed from a straight line defined by two points. A first point of the linear correction function is characterized by a predefined transition of a ballistic nozzle needle movement into a non-ballistic stroke stop, while a measurement of the exhaust gas temperature is used to determine the second point. The measured exhaust gas temperature can be determined with the aid of a fuel injection quantity function, which is combined with the
Abgastemperaturfunktion korreliert, eine Abweichung einer Ist-Einspritzmenge von einer Soll-Einspritzmenge ermittelt werden. Zur Korrektur der Einspritzmenge muss demnach um den hieraus ermittelten Differenzwert
nachgesteuert werden. Den einzelnen Funktionswerten der Soll -Einspritzmengenfunktion sind dabei zugehörige Abgastemperaturwerte zugeordnet, was gleichfalls auch für die Korrekturfunktion gilt. Aus den Differenzen zwischen Soll-Abgastemperaturen und Ist-Abgastemperaturen lassen sich somit einfach die zugehörigenExhaust gas temperature function correlated, a deviation of an actual injection amount of a desired injection quantity can be determined. For the correction of the injection quantity must therefore by the difference value determined from this be readjusted. Associated exhaust gas temperature values are assigned to the individual functional values of the desired injection quantity function, which also applies to the correction function. From the differences between target exhaust gas temperatures and actual exhaust gas temperatures can thus be easily associated
Differenzeinspritzmengen ermitteln und dadurch die Einspritzmenge an sich regeln.Determine differential injection quantities and thereby regulate the injection quantity itself.
Da sich im nicht ballistischen Bereich, also bei vollständig geöffneter Einspritzdüse, eine lineare Funktion der Einspritzmenge in Abhängigkeit der Ansteuerzeit ergibt, und die Einspritzmenge proportional abhängig von einem Querschnitt der Einspritzdüse ist, kann über die gemessene Differenz zwischen SoIl- Einspritzmenge und Ist-Einspritzmenge bei einer definierten Abgastemperatur auf einen Verkokungsgrad der Einspritzdüse geschlossen werden, da mit zunehmender Verkokung ein Querschnitt der Einspritzdüse verkleinert wird und weniger Kraftstoff durch die Einspritzdüse befördert werden kann. Da der Querschnitt der Einspritzdüse der einzige variable Wert in dieser Gleichung ist, kann aus der verringerten Einspritzmenge direkt auf eine Veränderung des Querschnitts der Einspritzdüse geschlossen werden und damit indirekt auf einen Verkokungsgrad derselben.Since in the non-ballistic area, ie when the injection nozzle is completely open, a linear function of the injection quantity as a function of the activation time results, and the injection quantity is proportionally dependent on a cross section of the injection nozzle, the measured difference between the injection quantity and the actual injection quantity can be used a defined exhaust gas temperature to a degree of coking of the injection nozzle are closed, since with increasing coking a cross section of the injection nozzle is reduced and less fuel can be transported through the injection nozzle. Since the cross section of the injection nozzle is the only variable value in this equation, it can be directly deduced from the reduced injection quantity on a change in the cross section of the injection nozzle and thus indirectly on a degree of coking thereof.
Weitere wichtige Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen, aus der Zeichnung und aus der zugehörigen Figurenbeschreibung anhand der Zeichnung.Other important features and advantages of the invention will become apparent from the dependent claims, from the drawing and from the associated description of the figures with reference to the drawing.
Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in
der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It is understood that the features mentioned above and those yet to be explained not only in the combination specified in each case, but also in other combinations or alone, without departing from the scope of the present invention.
Ein bevorzugtes Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird in der nachfolgenden Beschreibung näher erläutert .A preferred embodiment of the invention is illustrated in the drawing and will be explained in more detail in the following description.
Die einzige Fig. 1 zeigt ein Schaubild mit unterschiedlichen Verläufen einer Einspritzmenge in Abhängigkeit einer Ansteuerdauer.The only Fig. 1 shows a graph with different gradients of an injection quantity as a function of a drive time.
Entsprechend Fig. 1 sind insgesamt drei Verläufe 1, 2 und 3 gezeigt, wobei der Verlauf 1 bei einem Regeldruck von 2000 bar entsteht, während der Verlauf 2 bei 800 bar und der Verlauf 3 bei 250 bar Einspritzdruck auftreten. Auf der Ordinate ist dabei die Einspritzmenge in Kubikmillimeter abgetragen, während auf der Abszisse eine Ansteuerdauer in Millisekunden dargestellt ist. In einem nichtballistischen Bereich der Verläufe 1, 2 und 3, also beispielsweise ab einer Ansteuerdauer von > 0,5 ms ergibt sich ein im wesentlichen linearer Verlauf der unterschiedlichen Kurven 1, 2 und 3, welche im wesentlichen gemäß dem ZusammenhangAccording to FIG. 1, a total of three courses 1, 2 and 3 are shown, whereby the course 1 arises at a control pressure of 2000 bar, while the course 2 occurs at 800 bar and the course 3 at 250 bar injection pressure. On the ordinate, the injection quantity is plotted in cubic millimeters, while the abscissa represents a drive duration in milliseconds. In a non-ballistic range of the courses 1, 2 and 3, so for example from a control period of> 0.5 ms results in a substantially linear course of the different curves 1, 2 and 3, which substantially according to the context
m = p *C * Am = p * C * A
beschrieben werden können.can be described.
Im nichtballistischen Bereich ist somit die Einspritzmenge proportional abhängig von einem Querschnitt A einer nicht gezeigten Einspritzdüse, wobei sich die Querschnittsfläche A der Einspritzdüse aufgrund
von sog. Verkokungsprozessen im Laufe der Zeit verringern kann und dadurch die Einspritzmenge bei ansonsten gleichen Bedingungen abnimmt. Zu erwähnen ist noch, dass die Verläufe 1, 2 und 3 hinsichtlich ihrer Verläufe mit einer Abgastemperatur korrelieren, so dass jeder Abgastemperatur eine bestimmte Einspritzmenge direkt zuordenbar ist . Erfindungsgemäß ist nun zumindest ein Sensor vorgesehen, welcher eine Abgastemperatur ermittelt und an ein nicht gezeigtes elektronisches Steuergerät überträgt, in welchem das gewonnene Sensorsignal in zumindest ein Ausgangssignal für die Ansteuerung der Kraftstoffeinspritzeinrichtung verarbeitet wird.In the non-ballistic area, the injection quantity is thus proportionally dependent on a cross-section A of an injection nozzle, not shown, wherein the cross-sectional area A of the injection nozzle due to of so-called coking processes can decrease over time and thereby decreases the injection quantity under otherwise identical conditions. It should also be mentioned that the curves 1, 2 and 3 correlate with respect to their course with an exhaust gas temperature, so that each exhaust gas temperature can be assigned a specific injection quantity directly. According to the invention, at least one sensor is now provided, which determines an exhaust gas temperature and transmits it to an electronic control unit, not shown, in which the obtained sensor signal is processed into at least one output signal for controlling the fuel injection device.
Zur Regelung der Einspritzmenge an der Einspritzdüse wird dabei eine lineare Korrekturfunktion 4 verwendet, wobei zur Korrektur der Einspritzmenge die Funktionswerte der Korrekturfunktion mit den Funktionswerten einer SoIl- Einspritzmengenfunktion verglichen werden. Die Korrekturfunktion 4 wird dabei durch zumindest zwei Punkte 5 und 6 gebildet, wobei der erste Punkt 5 der linearen Korrekturfunktion 4 durch einen vordefinierten Übergang einer ballistischen Düsennadelbewegung in einen nicht ballistischen Hubanschlag charakterisiert ist, während für die Bestimmung des zweiten Punktes 6 eine Messung der Abgastemperatur herangezogen wird. Da die Abgastemperatur mit einer jeweils zugehörigen Einspritzmenge korreliert, kann mit der Korrekturfunktion 4 auch eine Ist -Einspritzmenge bestimmt werden.To control the injection quantity at the injection nozzle, a linear correction function 4 is used, the function values of the correction function being compared with the function values of a fuel injection quantity function for the purpose of correcting the injection quantity. The correction function 4 is formed by at least two points 5 and 6, wherein the first point 5 of the linear correction function 4 is characterized by a predefined transition of a ballistic nozzle needle movement in a non-ballistic stroke stop, while for the determination of the second point 6, a measurement of the exhaust gas temperature is used. Since the exhaust gas temperature correlates with a respectively associated injection quantity, the correction function 4 can also be used to determine an actual injection quantity.
Ist diese Ist-Einspritzmenge kleiner als die Soll- Einspritzmenge, so kann dies aufgrund des linearen Zusammenhangs gemäß oben dargestellter Gleichung bei im übrigen unveränderten Parametern lediglich an einer Querschnittsverringerung liegen. Eine derartige
Querschnittsverringerung kann beispielsweise aufgrund einer Verkokung eines Spritzlochs der Einspritzdüse vorliegen, wobei bei zunehmender Verkokung der Spritzlochdurchmesser stetig abnimmt.If this actual injection quantity is smaller than the setpoint injection quantity, this may merely be due to a reduction in cross-section due to the linear relationship according to the equation shown above, with otherwise unchanged parameters. Such Cross-sectional reduction can be present, for example, due to coking of a spray hole of the injection nozzle, with increasing coking the spray hole diameter steadily decreases.
Generell ist der erste Punkt 5 der linearen Korrekturfunktion 4 für ein jeweiliges Injektordesign fest definiert. Der Punkt 6 hingegen bzw. die Mengenänderung in diesem Punkt wird erfindungsgemäß durch eine Messung der Abgastemperatur in diesem Punkt messtechnisch über einen Temperatursensor, insbesondere einen T3-Sensor bestimmt. Die zwischen den beiden Punkten 5 und 6 aufgespannte Gerade erlaubt somit eine Einspritzmengenkorrektur an beliebigen Zwischenstellen, wobei die Korrekturfunktion 4 für unterschiedliche Raildrücke durch entsprechende Abgastemperaturmessungen entlang einer Volllastkennlinie durchgeführt werden kann. Hierbei kann insbesondere vorgesehen sein, dass für die Bestimmung des zweiten Punktes 6 der Korrekturfunktion 4 eine Messung der Abgastemperatur unter Volllast herangezogen wird. Ebenfalls vorstellbar ist, dass das Ermitteln der Korrekturfunktion 4 im normalen Betrieb der Brennkraftmaschine oder in einem separaten Lernmodus erfolgt .In general, the first point 5 of the linear correction function 4 is firmly defined for a respective injector design. By contrast, the point 6 or the change in quantity at this point is determined by measuring the exhaust gas temperature at this point by measuring a temperature sensor, in particular a T3 sensor. The straight line spanned between the two points 5 and 6 thus permits injection quantity correction at arbitrary intermediate points, wherein the correction function 4 can be carried out for different rail pressures by means of corresponding exhaust-gas temperature measurements along a full-load characteristic curve. In this case, it can be provided, in particular, that a measurement of the exhaust gas temperature under full load is used for the determination of the second point 6 of the correction function 4. It is also conceivable that the determination of the correction function 4 takes place during normal operation of the internal combustion engine or in a separate learning mode.
Generell können mit dem erfindungsgemäßen Verfahren sowohl eine Haupteinspritzmenge als auch eine Voreinspritz- oder eine Nacheinspritzmenge bzw. beliebige Kombinationen geregelt werden. Darüber hinaus können zwischen den beiden Punkten 5 und 6 weitere Stützpunkte 7 vorgesehen sein, durch welche die Korrekturfunktion 4 noch genauer dargestellt werden kann.
Die Ermittlung der Verringerung des Querschnitts A der Einspritzdüse bzw. die Ermittlung der aufgrund des verringerten Querschnitts A erhöhten Einspritzmenge erfolgt dabei wie folgt :In general, with the method according to the invention both a main injection quantity and a pilot injection quantity or a post-injection quantity or any desired combinations can be regulated. In addition, further support points 7 can be provided between the two points 5 and 6, by means of which the correction function 4 can be represented in even greater detail. The determination of the reduction of the cross section A of the injection nozzle or the determination of the increased due to the reduced cross section A injection quantity is carried out as follows:
Zunächst wird eine Korrekturfunktion 4 aufgestellt, welche im Wesentlichen linear verläuft und welche zwischen zwei Punkten 5 und 6 aufgespannt ist. Der Punkt 5 ist dabei der Übergang zwischen dem ballistischen und dem nichtballistischen Bereich, während der Punkt 6 mittels eines Temperatursensors ermittelt wird, der eine Abgastemperatur der Brennkraftmaschine misst. Der gemäß Fig. 1 schraffierte Bereich im Verlauf 1 zeigt dabei beispielsweise die Abnahme einer Einspritzmenge ΔE, welche bei ansonsten gleichen Parametern ausschließlich auf einer Verringerung des Querschnitts A der Einspritzdüse basiert. Eine ursprüngliche Einspritzmenge bei vollständig geöffnetem Einspritzdüsenquerschnitt beträgt dabei einer Ansteuerdauer von 1 ms etwa 66 mm3. Aufgrund der Verringerung des Querschnitts A der Einspritzdüse verringert sich die Einspritzmenge um ΔE ~ 2,5, so dass bei gleicher Ansteuerdauer aufgrund des verringerten Einspritzdüsenquerschnittes A lediglich eine Einspritzmenge von 63,5 mm3 eingespritzt wird. Um bei gleich bleibendem Einspritzdruck und bei verringertem Querschnitt A der Einspritzdüse die gleiche Einspritzmenge einspritzen zu können, muss gemäß Fig. 1 die Ansteuerdauer demnach um 0,05 ms verlängert werden. Diese verlängerte Ansteuerdauer wird dabei von dem Steuergerät berechnet und in ein entsprechendes Steuersignal umgesetzt.First, a correction function 4 is set up, which runs substantially linearly and which is spanned between two points 5 and 6. The point 5 is the transition between the ballistic and the non-ballistic area, while the point 6 is determined by means of a temperature sensor which measures an exhaust gas temperature of the internal combustion engine. The hatched in FIG. 1 area in the course 1 shows, for example, the decrease of an injection amount .DELTA.E, which is based on otherwise reducing the cross-section A of the injector with otherwise identical parameters. An initial injection quantity with the injector cross section fully open is approximately 66 mm 3 for a control period of 1 ms. Due to the reduction in the cross-section A of the injection nozzle, the injection quantity is reduced by ΔE ~ 2.5, so that with the same drive duration due to the reduced injector cross-section A only an injection quantity of 63.5 mm 3 is injected. In order to be able to inject the same injection quantity with the same injection pressure and with a reduced cross-section A of the injection nozzle, according to FIG. 1 the activation duration must therefore be extended by 0.05 ms. This extended activation time is calculated by the control unit and converted into a corresponding control signal.
Insbesondere kann mit der Kennzahl ΔE auch ein Verkokungsgrad der Einspritzdüse ermittelt werden,
welcher sich in der Querschnittsverringerung der Einspritzdüse ausdrückt.
In particular, the coefficient ΔE can also be used to determine a degree of coking of the injection nozzle, which is expressed in the cross-sectional reduction of the injection nozzle.
Claims
1. Verfahren zur Regelung einer Einspritzmenge an einer Einspritzdüse einer Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine, bei dem zumindest eine von einem Sensor ermittelte Abgastemperatur gewonnen und in einem elektronischen Steuergerät zu zumindest einem Ausgangssignal für die Ansteuerung derAnspruch [en] A method for controlling an injection quantity at an injection nozzle of a fuel injection device for an internal combustion engine, in which at least one exhaust gas temperature determined by a sensor is obtained and in an electronic control device at least one output signal for the control of
Kraftstoffeinspritzeinrichtung verarbeitet wird, dadurch gekennzeichnet, dassFuel injection device is processed, characterized in that
- zur Regelung der Einspritzmenge an der Einspritzdüse in einem nicht ballistischen Bereich eine lineare Korrekturfunktion (4) verwendet wird,a linear correction function (4) is used to control the injection quantity at the injection nozzle in a non-ballistic area,
- wobei zur Korrektur der Einspritzmenge Funktionswerte der Korrekturfunktion (4) mit Funktionswerten einer Soll -Einspritzmengenfunktion verglichen werden,wherein, for correcting the injection quantity, functional values of the correction function (4) are compared with functional values of a desired injection quantity function,
- wobei die lineare Korrekturfunktion (4) durch zumindest zwei Punkte (5,6) definiert wird,- wherein the linear correction function (4) is defined by at least two points (5, 6),
- wobei der erste Punkt (5) der linearen Korrekturfunktion (4) durch einen vordefinierten Übergang einer ballistischen Düsennadelbewegung in einen nicht ballistischen Hubanschlag charakterisiert ist, während für die Bestimmung des zweiten Punkts (6) eine Messung der Abgastemperatur herangezogen wird.- Wherein the first point (5) of the linear correction function (4) is characterized by a predefined transition of a ballistic nozzle needle movement in a non-ballistic stroke stop, while for the determination of the second point (6) a measurement of the exhaust gas temperature is used.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass für die Bestimmung des zweiten Punkts (6) der Korrekturfunktion (4) eine Messung der Abgastemperatur unter Volllast herangezogen wird.2. The method according to claim 1, characterized in that for the determination of the second point (6) of the correction function (4) a measurement of the exhaust gas temperature under full load is used.
3. Verfahren nach Anspruch 1 oder 2 , dadurch gekennzeichnet, dass die lineare Korrekturfunktion (4) für unterschiedliche Raildrücke ermittelt wird.3. The method according to claim 1 or 2, characterized in that the linear correction function (4) is determined for different rail pressures.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Ermitteln der Korrekturfunktion (4) im normalen Betrieb der Brennkraftmaschine oder in einem separaten Lernmodus erfolgt . 4. The method according to any one of claims 1 to 3, characterized in that the determination of the correction function (4) takes place during normal operation of the internal combustion engine or in a separate learning mode.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007002028A DE102007002028A1 (en) | 2007-01-13 | 2007-01-13 | Regulating method for injected fuel amount at injection nozzle of fuel injecting unit for internal-combustion engine, involves comparing function values of correction function with function values of target injected amount function |
| DE102007002028.9 | 2007-01-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008083989A1 true WO2008083989A1 (en) | 2008-07-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2008/000195 WO2008083989A1 (en) | 2007-01-13 | 2008-01-11 | Method for controlling the injection quantity on an injection nozzle |
Country Status (2)
| Country | Link |
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| DE (1) | DE102007002028A1 (en) |
| WO (1) | WO2008083989A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008001412B4 (en) * | 2008-04-28 | 2016-12-15 | Robert Bosch Gmbh | Method and device for operating an injection valve |
| DE102009009796B3 (en) * | 2009-02-20 | 2010-10-07 | L'orange Gmbh | Diesel internal-combustion engine diagnosing and/or controlling method, involves determining whether pressure difference of injection interval in opening phase and/or injection interval in closing phase exceeds preset value |
| DE102011085926A1 (en) * | 2011-11-08 | 2013-05-08 | Robert Bosch Gmbh | Method for operating an internal combustion engine |
| JP6115513B2 (en) * | 2014-04-23 | 2017-04-19 | 株式会社デンソー | Deposit detection device and fuel injection control device |
| AT518584B1 (en) | 2016-05-11 | 2018-02-15 | Ge Jenbacher Gmbh & Co Og | Method for detecting the amount of gas |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004003366A1 (en) * | 2002-06-28 | 2004-01-08 | Robert Bosch Gmbh | Method for controlling a fuel metering system of an internal combustion engine |
| DE10306458A1 (en) * | 2003-02-17 | 2004-08-26 | Robert Bosch Gmbh | Method for determining control voltage of piezoelectric actuator of injection valve varying control voltage depending on the control duration of piezoelectric actuator |
| DE102004007799A1 (en) * | 2004-02-18 | 2005-09-08 | Robert Bosch Gmbh | Individual injector equalizing process for fuel injection system involves calculating rise-weighted injector equalizing amount from which to form corrected duration |
| EP1574694A1 (en) * | 2004-02-24 | 2005-09-14 | Renault s.a.s. | Apparatus and method controlling metering of injected fuel in a diesel engine |
-
2007
- 2007-01-13 DE DE102007002028A patent/DE102007002028A1/en not_active Withdrawn
-
2008
- 2008-01-11 WO PCT/EP2008/000195 patent/WO2008083989A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004003366A1 (en) * | 2002-06-28 | 2004-01-08 | Robert Bosch Gmbh | Method for controlling a fuel metering system of an internal combustion engine |
| DE10306458A1 (en) * | 2003-02-17 | 2004-08-26 | Robert Bosch Gmbh | Method for determining control voltage of piezoelectric actuator of injection valve varying control voltage depending on the control duration of piezoelectric actuator |
| DE102004007799A1 (en) * | 2004-02-18 | 2005-09-08 | Robert Bosch Gmbh | Individual injector equalizing process for fuel injection system involves calculating rise-weighted injector equalizing amount from which to form corrected duration |
| EP1574694A1 (en) * | 2004-02-24 | 2005-09-14 | Renault s.a.s. | Apparatus and method controlling metering of injected fuel in a diesel engine |
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| DE102007002028A1 (en) | 2007-12-13 |
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