EP2593653A1 - Adaptation method - Google Patents

Adaptation method

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Publication number
EP2593653A1
EP2593653A1 EP11726342.6A EP11726342A EP2593653A1 EP 2593653 A1 EP2593653 A1 EP 2593653A1 EP 11726342 A EP11726342 A EP 11726342A EP 2593653 A1 EP2593653 A1 EP 2593653A1
Authority
EP
European Patent Office
Prior art keywords
actual
combustion chamber
fuel
operating state
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11726342.6A
Other languages
German (de)
French (fr)
Inventor
Frank Altenschmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mercedes Benz Group AG
Original Assignee
Daimler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daimler AG filed Critical Daimler AG
Publication of EP2593653A1 publication Critical patent/EP2593653A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
    • 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
    • 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
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D41/1402—Adaptive control
    • 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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D41/2096—Output circuits, e.g. for controlling currents in command coils for controlling piezoelectric injectors
    • 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
    • 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
    • F02D41/402—Multiple injections

Definitions

  • the present invention relates to a method for adapting an electrical control of a fuel injector according to the preamble of claim 1.
  • a method for adapting an electrical control of a fuel injector in which the fuel injector has a direct injection nozzle needle and serves for metering fuel to a combustion chamber of an internal combustion engine.
  • a current operating state of the internal combustion engine is monitored and adapted depending on the electrical control, which causes the actuation of the fuel injector.
  • this is realized in the known method in that the
  • Drive energy and the needle stroke of the fuel injection valve can be controlled so that the engine torque in a fuel injection valve with
  • Engine torque is adapted to the engine torque generated with a reference-type injector.
  • the known method is primarily used to compensate for production-related or aging-related changes in the injection behavior of the respective fuel injection valve.
  • the present invention deals with the problem for such a
  • Combustion chamber prevailing pressure or adjusting itself in the combustion chamber temporal pressure curve correlates with the actual work generated in the respective cylinder, which is introduced into the respective piston.
  • an actual work is now determined depending on the measured pressure, which is compared with a target work, which can be assigned to the current operating state.
  • This target work is the work that is in the current operating state due to the activation of the respective
  • Fuel injector should actually stop and, for example, one
  • Engine control unit is specified.
  • the current operating state of the internal combustion engine is determined by an associated engine control unit, for example in order to meet a specific performance request of the driver or a speed control device of the vehicle.
  • the engine control unit or a coupled injector control unit actuates the fuel injectors to overflow
  • Internal combustion engine controls or actuates, such as in a supercharged internal combustion engine, a variable turbine geometry, a throttle valve, variable valve trains and other valves and valves, in particular for
  • Combustion air control and possibly existing ignition devices.
  • the now actually set actual operating state is monitored in the invention on the basis of the pressure that sets in the combustion chambers. This can be done in particular cylinder-selective, that is, for each cylinder or for each combustion chamber, the pressure is detected individually.
  • Fuel injector are performed. For example, if the actual work is too large, this indicates that too much fuel has been injected. Accordingly, for example, a characteristic for operating the fuel injector, the
  • Relationship between injected fuel quantity, needle stroke and electric Actuator signal represented, be moved accordingly. Accordingly, with correction of the needle stroke, the amount of fuel to be injected can be adapted to the desired operating state of the internal combustion engine.
  • the adaptation method is a pure adaptation and not a regulation. While a control at each sufficient soli-actual deviation performs a control intervention, ie at each cycle and in particular at each cylinder, an adaptation performs an adaptation intervention with an adjustment of the electrical control only as a function of further boundary conditions, for example by the respective adaptation or Adaptation to give a lasting character. For example, it may be provided in the context of such an adaptation that an adjustment of the electrical control takes place only when the target-actual deviation during a predetermined number of consecutive cycles one
  • staggered assignments of deviation values and repetition numbers can be taken into account, so that there is a quasi-weighting of the deviations. For example, larger ones have to
  • the aim of the adaptation is thus not the compensation may be temporary
  • an actual pressure profile can be measured for the respective combustion chamber, that is, the development of the pressure over the
  • an indicated actual mean pressure for the respective combustion chamber can then be determined.
  • the indicated mean pressure represents the work related to the stroke volume per working cycle, with which the actual work of the respective combustion chamber can be determined from the determined indicated actual mean pressure.
  • Deviations are of particular interest in modern internal combustion engines, in which, for example, multiple injections are carried out.
  • the adaptation is performed during a multiple injection operation in which the fuel is supplied to the respective combustion chamber by means of a plurality of separate injections. It is also conceivable to carry out the adaptation during a single injection operation in which the
  • Fuel is supplied by means of a single injection to the respective combustion chamber.
  • stratified mixture reaches a stratification of the charge in the combustion chamber by an ignitable mixture is present in the region of the ignition device at the time of ignition, while in the farther region of the ignition device is a leaner
  • the fuel injected into the combustion chamber is produced or aligned such that at least part of the fuel in the combustion chamber moves in the direction of the ignition device.
  • wall-guided combustion process in which wall surfaces, in particular on the piston, take over the leadership of the fuel movement.
  • Burning known in which the leadership of the fuel movement in the combustion chamber largely supplied by the charge movement of the combustion chamber
  • Combustion air is guided.
  • the adaptation method proposed here can preferably be used in spray-guided combustion processes, since the precise beam design is important there.
  • adaptation method presented here for fuel injectors with outwardly opening nozzle is suitable.
  • the adaptation method can also be used with fuel injectors that work with an inwardly opening nozzle.
  • the adaptation method presented here is furthermore preferably used in fuel injectors which have a piezoactuator as the direct drive of the nozzle needle. There is a direct proportionality between control voltage and needle stroke.
  • the adaptation method can also be used in fuel injectors whose direct drive operates with an electromagnet for driving the nozzle needle. Furthermore, the adaptation method can also be used in fuel injectors with hydraulic transmission for controlling the nozzle needle. It is clear that with the adaptation method presented here, fuel injectors can be adapted for self-igniting or externally ignited internal combustion engines. Likewise, the adaptation method is suitable both for internal combustion engines, which are operated with liquid fuels, as well as for internal combustion engines, which are operated with gaseous fuels.

Abstract

The invention relates to a method for adapting an electric control of a fuel injector, with which fuel can be metered to a combustion chamber of an internal combustion engine, with a direct drive of a nozzle needle, wherein a current operating state of the internal combustion engine is monitored, and the electric control is adapted dependent on said operating state. An improved adaptation can be achieved if the current operating state is monitored by means of a pressure that is prevalent in the respective combustion chamber if an actual activity is ascertained dependent on the measured pressure, if the ascertained actual activity is compared with a target activity that is assigned to the current operating state, and if the electric control of the respective fuel injector is adapted dependent on the target/actual comparison of the current activity of the respective combustion chamber.

Description

Adaptionsverfahren  adaptation method
Die vorliegende Erfindung betrifft ein Verfahren zum Adaptieren einer elektrischen Ansteuerung eines Kraftstoffinjektors gemäß dem Oberbegriff des Anspruchs 1. The present invention relates to a method for adapting an electrical control of a fuel injector according to the preamble of claim 1.
Aus der DE 10 2006 07 823 A1 ist ein Verfahren zum Adaptieren einer elektrischen Ansteuerung eines Kraftstoffinjektors bekannt, bei dem der Kraftstoffinjektor eine Düsennadel mit Direktantrieb aufweist und zum Zumessen von Kraftstoff zu einem Brennraum einer Brennkraftmaschine dient. Beim bekannten Adaptionsverfahren wird ein aktueller Betriebszustand der Brennkraftmaschine überwacht und abhängig davon die elektrische Ansteuerung, welche die Betätigung des Kraftstoffinjektors bewirkt, adaptiert. Im Einzelnen wird dies beim bekannten Verfahren dadurch realisiert, dass die From DE 10 2006 07 823 A1 a method for adapting an electrical control of a fuel injector is known in which the fuel injector has a direct injection nozzle needle and serves for metering fuel to a combustion chamber of an internal combustion engine. In the known adaptation method, a current operating state of the internal combustion engine is monitored and adapted depending on the electrical control, which causes the actuation of the fuel injector. In detail, this is realized in the known method in that the
Ansteuerenergie und der Nadelhub des Kraftstoff-Einspritzventils derart gesteuert werden, dass sich das Motordrehmoment bei einem Kraftstoff-Einspritzventil mit Drive energy and the needle stroke of the fuel injection valve can be controlled so that the engine torque in a fuel injection valve with
Referenzcharakteristik nicht verändern würde, wobei eine tatsächlich auftretende Änderung des Motordrehmoments erfasst wird und wobei durch Verändern der Steigung der Ansteuerenergie-Nadelhub-Kennlinie des Kraftstoff-Einspritzventils das Reference characteristic would not change, wherein an actually occurring change in the engine torque is detected and wherein by changing the slope of the driving energy-Nadelhub characteristic of the fuel injection valve, the
Motordrehmoment an das mit einem Einspritzventil mit Referenzcharakteristik erzeugte Motordrehmoment angepasst wird. Das bekannte Verfahren dient vor allem dazu, herstellungsbedingte oder alterungsbedingte Änderungen des Einspritzverhaltens des jeweiligen Kraftstoff-Einspritzventils zu kompensieren. Engine torque is adapted to the engine torque generated with a reference-type injector. The known method is primarily used to compensate for production-related or aging-related changes in the injection behavior of the respective fuel injection valve.
Die vorliegende Erfindung beschäftigt sich mit dem Problem, für ein derartiges The present invention deals with the problem for such a
Adaptionsverfahren eine verbesserte oder zumindest eine andere Ausführungsform anzugeben, die sich beispielsweise durch eine hohe Zuverlässigkeit auszeichnet. Adaptation to provide an improved or at least another embodiment, which is characterized for example by a high reliability.
Erfindungsgemäß wird dieses Problem durch den Gegenstand des unabhängigen Anspruchs gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche. Die Erfindung beruht auf dem allgemeinen Gedanken, den aktuellen Betriebszustand der Brennkraftmaschine anhand eines im jeweiligen Brennraum herrschenden Druckes zu überwachen. Beispielsweise kann hierfür je Brennraum ein Drucksensor vorgesehen werden, der an geeigneter Stelle am bzw. im Brennraum angeordnet ist. Der im According to the invention, this problem is solved by the subject matter of the independent claim. Advantageous embodiments are the subject of the dependent claims. The invention is based on the general idea of monitoring the current operating state of the internal combustion engine on the basis of a pressure prevailing in the respective combustion chamber. For example, for each combustion chamber, a pressure sensor can be provided which is arranged at a suitable point on or in the combustion chamber. The im
Brennraum herrschende Druck bzw. der sich im Brennraum einstellende zeitliche Druckverlauf korreliert mit der im jeweiligen Zylinder tatsächlich erzeugten Arbeit, die in den jeweiligen Kolben eingeleitet wird. Combustion chamber prevailing pressure or adjusting itself in the combustion chamber temporal pressure curve correlates with the actual work generated in the respective cylinder, which is introduced into the respective piston.
Beim erfindungsgemäßen Adaptionsverfahren wird nun abhängig vom gemessenen Druck eine Ist-Arbeit ermittelt, die mit einer Soll-Arbeit verglichen wird, die sich dem aktuellen Betriebszustand zuordnen lässt. Diese Soll-Arbeit ist dabei diejenige Arbeit, die sich beim aktuellen Betriebszustand aufgrund der Ansteuerung des jeweiligen In the adaptation method according to the invention an actual work is now determined depending on the measured pressure, which is compared with a target work, which can be assigned to the current operating state. This target work is the work that is in the current operating state due to the activation of the respective
Kraftstoffinjektors eigentlich einstellen sollte und beispielsweise von einem Fuel injector should actually stop and, for example, one
Motorsteuergerät vorgegeben ist. Mit anderen Worten, der aktuelle Betriebszustand der Brennkraftmaschine wird von einem zugehörigen Motorsteuergerät bestimmt, beispielsweise um einen bestimmten Leistungswunsch des Fahrzeugführers oder einer Geschwindigkeitsregeleinrichtung des Fahrzeugs erfüllen zu können. Abhängig von diesem gewünschten Soll-Betriebszustand betätigt das Motorsteuergerät oder ein damit gekoppeltes Injektorsteuergerät, die Kraftstoffinjektoren, um über die Engine control unit is specified. In other words, the current operating state of the internal combustion engine is determined by an associated engine control unit, for example in order to meet a specific performance request of the driver or a speed control device of the vehicle. Depending on this desired setpoint operating state, the engine control unit or a coupled injector control unit actuates the fuel injectors to overflow
Kraftstoffeinspritzung den gewünschten Soll-Betriebszustand herbeizuführen. Es ist klar, dass das Motorsteuergerät dabei gleichzeitig auch weitere Komponenten der Fuel injection to bring about the desired desired operating condition. It is clear that the engine control unit at the same time also other components of
Brennkraftmaschine ansteuert bzw. betätigt, wie zum Beispiel bei einer aufgeladenen Brennkraftmaschine eine variable Turbinengeometrie, eine Drosselklappe, variable Ventiltriebe und sonstige Klappen und Ventile, insbesondere zur Internal combustion engine controls or actuates, such as in a supercharged internal combustion engine, a variable turbine geometry, a throttle valve, variable valve trains and other valves and valves, in particular for
Verbrennungsluftluftsteuerung, sowie gegebenenfalls vorhandene Zündeinrichtungen. Der nun tatsächlich eingestellte Ist-Betriebszustand wird bei der Erfindung anhand des Drucks überwacht, der sich in den Brennräumen einstellt. Dies kann insbesondere zylinderselektiv erfolgen, das heißt für jeden Zylinder bzw. für jeden Brennraum wird der Druck individuell erfasst. Combustion air control, and possibly existing ignition devices. The now actually set actual operating state is monitored in the invention on the basis of the pressure that sets in the combustion chambers. This can be done in particular cylinder-selective, that is, for each cylinder or for each combustion chamber, the pressure is detected individually.
Abhängig vom so realisierten Soll-Ist-Vergleich der aktuellen Arbeit des jeweiligen Brennraums kann nun die Adaption der elektrischen Ansteuerung des jeweiligen Depending on the so realized target-actual comparison of the current work of the respective combustion chamber, the adaptation of the electrical control of the respective
Kraftstoffinjektors durchgeführt werden. Ist beispielsweise die Ist-Arbeit zu groß, deutet dies darauf hin, dass zuviel Kraftstoff eingespritzt worden ist. Dementsprechend kann beispielsweise eine Kennlinie zur Betätigung des Kraftstoffinjektors, die den Fuel injector are performed. For example, if the actual work is too large, this indicates that too much fuel has been injected. Accordingly, for example, a characteristic for operating the fuel injector, the
Zusammenhang zwischen eingespritzter Kraftstoffmenge, Nadelhub und elektrischem Ansteuersignal repräsentiert, entsprechend verschoben werden. Dementsprechend kann mit Korrektur des Nadelhubs die einzuspritzende Kraftstoffmenge dem Soll- Betriebszustand der Brennkraftmaschine angepasst werden. Relationship between injected fuel quantity, needle stroke and electric Actuator signal represented, be moved accordingly. Accordingly, with correction of the needle stroke, the amount of fuel to be injected can be adapted to the desired operating state of the internal combustion engine.
Bevorzugt handelt es sich beim Adaptionsverfahren um eine reine Adaption und nicht um eine Regelung. Während eine Regelung bei jeder hinreichenden Soli-Ist-Abweichung einen Regeleingriff durchführt, also bei jedem Arbeitsspiel und insbesondere bei jedem Zylinder, führt eine Adaption einen Adaptionseingriff mit einer Anpassung der elektrischen Ansteuerung nur in Abhängigkeit von weiteren Randbedingungen durch, beispielsweise um der jeweiligen Adaption bzw. Anpassung einen dauerhaften Charakter zu verleihen. Beispielsweise kann im Rahmen einer derartigen Adaption vorgesehen sein, dass eine Anpassung der elektrischen Ansteuerung nur dann erfolgt, wenn die Soll-Ist-Abweichung während einer vorbestimmten Anzahl aufeinanderfolgender Arbeitsspiele eine Preferably, the adaptation method is a pure adaptation and not a regulation. While a control at each sufficient soli-actual deviation performs a control intervention, ie at each cycle and in particular at each cylinder, an adaptation performs an adaptation intervention with an adjustment of the electrical control only as a function of further boundary conditions, for example by the respective adaptation or Adaptation to give a lasting character. For example, it may be provided in the context of such an adaptation that an adjustment of the electrical control takes place only when the target-actual deviation during a predetermined number of consecutive cycles one
vorbestimmte Mindestabweichung übersteigt. Dabei können gestaffelte Zuordnungen von Abweichungswerten und Wiederholungszahlen berücksichtigt werden, so dass sich quasi eine Gewichtung der Abweichungen ergibt. Beispielsweise müssen sich größere exceeds the predetermined minimum deviation. In this case, staggered assignments of deviation values and repetition numbers can be taken into account, so that there is a quasi-weighting of the deviations. For example, larger ones have to
Abweichungen weniger oft wiederholen als kleinere Abweichungen, um einen Repeat deviations less often than minor deviations to one
entsprechenden Adaptionseingriff auszulösen. trigger appropriate adaptation intervention.
Ziel der Adaption ist somit nicht der Ausgleich möglicherweise vorübergehender The aim of the adaptation is thus not the compensation may be temporary
Fehlinjektionen, sondern der Ausgleich herstellungsbedingter, also im Wesentlichen toleranzbedingter, Abweichungen sowie der Ausgleich von Alterungserscheinungen. Misleading injections, but the compensation of production-related, ie essentially tolerance-related, deviations and the compensation of aging phenomena.
Entsprechend einer vorteilhaften Ausführungsform kann für den jeweiligen Brennraum ein Ist-Druckverlauf gemessen werden, also die Entwicklung des Drucks über den According to an advantageous embodiment, an actual pressure profile can be measured for the respective combustion chamber, that is, the development of the pressure over the
Kurbelwinkel. Aus diesem gemessenen Ist-Druckverlauf lässt sich dann ein indizierter Ist- Mitteldruck für den jeweiligen Brennraum ermitteln. Der indizierte Mitteldruck stellt die auf das Hubvolumen bezogene Arbeit je Arbeitsspiel dar, womit sich aus dem ermittelten indizierten Ist-Mitteldruck die Ist-Arbeit des jeweiligen Brennraums ermitteln lässt. Crank angle. From this measured actual pressure curve, an indicated actual mean pressure for the respective combustion chamber can then be determined. The indicated mean pressure represents the work related to the stroke volume per working cycle, with which the actual work of the respective combustion chamber can be determined from the determined indicated actual mean pressure.
Eine derartige Ermittlung der Ist-Arbeit ermöglicht eine Adaption der elektrischen Such a determination of the actual work allows an adaptation of the electrical
Ansteuerung des jeweiligen Kraftstoffinjektors auch bei vergleichsweise kleinen, insbesondere wiederholt auftretenden Soll-Ist-Abweichungen. Derartige kleinere Control of the respective fuel injector even with comparatively small, in particular repeatedly occurring target-actual deviations. Such smaller ones
Abweichungen sind insbesondere bei modernen Brennkraftmaschinen von erhöhtem Interesse, bei denen beispielsweise Mehrfacheinspritzungen durchgeführt werden. Deviations are of particular interest in modern internal combustion engines, in which, for example, multiple injections are carried out.
Innerhalb einer solchen Mehrfacheinspritzung soll mit Hilfe einzelner, zeitlich voneinander beabstandeter Einzeleinspritzungen jeweils nur eine vergleichsweise kleine Einspritzmenge eingebracht werden. Innerhalb dieser Einzeleinspritzungen wirken sich Soli-Ist-Abweichungen besonders deutlich aus. Within such a multiple injection should be with the help of individual, temporally spaced individual injections each only a comparatively small Injection amount are introduced. Within these individual injections, soli-actual deviations have a particularly pronounced effect.
Dementsprechend wird gemäß einer vorteilhaften Ausführungsform die Adaption während eines Mehrfacheinspritzbetriebs durchgeführt, bei dem der Kraftstoff mittels mehrerer getrennter Einspritzungen dem jeweiligen Brennraum zugeführt wird. Es ist auch denkbar, die Adaption während eines Einfacheinspritzbetriebs durchzuführen, bei dem der Accordingly, according to an advantageous embodiment, the adaptation is performed during a multiple injection operation in which the fuel is supplied to the respective combustion chamber by means of a plurality of separate injections. It is also conceivable to carry out the adaptation during a single injection operation in which the
Kraftstoff mittels einer einzigen Einspritzung dem jeweiligen Brennraum zugeführt wird. Fuel is supplied by means of a single injection to the respective combustion chamber.
Besonders zweckmäßig ist das vorgeschlagene Adaptionsverfahren bei Particularly useful is the proposed adaptation method at
Brennkraftmaschinen mit Direkteinspritzung, bei denen der Kraftstoff direkt in den Internal combustion engines with direct injection, in which the fuel directly into the
Brennraum zugemessen wird. Insbesondere wird bei Direkteinspritzung mit Brennraum is metered. In particular, with direct injection with
geschichtetem Gemisch eine Schichtung der Ladung im Brennraum erreicht, indem im Bereich der Zündeinrichtung zum Zeitpunkt der Zündung ein zündfähiges Gemisch vorliegt, während im weiter entfernten Bereich der Zündeinrichtung ein magereres stratified mixture reaches a stratification of the charge in the combustion chamber by an ignitable mixture is present in the region of the ignition device at the time of ignition, while in the farther region of the ignition device is a leaner
Gemisch vorliegt. Beispielsweise wird bei strahlgeführten Brennverfahren der in den Brennraum eingespritzte Kraftstoff so erzeugt bzw. ausgerichtet, dass sich zumindest ein Teil des Kraftstoffs im Brennraum in Richtung Zündeinrichtung bewegt. Ferner gibt es wandgeführte Brennverfahren, bei welcher Wandflächen, insbesondere am Kolben, die Führung der Kraftstoffbewegung übernehmen. Außerdem sind luftgeführte Mixture is present. For example, in the case of spray-guided combustion methods, the fuel injected into the combustion chamber is produced or aligned such that at least part of the fuel in the combustion chamber moves in the direction of the ignition device. Furthermore, there are wall-guided combustion process in which wall surfaces, in particular on the piston, take over the leadership of the fuel movement. There are also air-conditioned
Brennverfahren bekannt, bei denen die Führung der Kraftstoffbewegung im Brennraum weitgehend durch die Ladungsbewegung der dem Brennraum zugeführten Burning known, in which the leadership of the fuel movement in the combustion chamber largely supplied by the charge movement of the combustion chamber
Verbrennungsluft geführt ist. Das hier vorgeschlagene Adaptionsverfahren kann bevorzugt bei strahlgeführten Brennverfahren verwendet werden, da es dort auf die präzise Strahlgestaltung ankommt. Combustion air is guided. The adaptation method proposed here can preferably be used in spray-guided combustion processes, since the precise beam design is important there.
Des Weiteren eignet sich das hier vorgestellte Adaptionsverfahren für Kraftstoff Injektoren mit nach außen öffnender Düse. Alternativ lässt sich das Adaptionsverfahren auch bei Kraftstoffinjektoren anwenden, die mit einer nach innen öffnenden Düse arbeiten. Furthermore, the adaptation method presented here for fuel injectors with outwardly opening nozzle is suitable. Alternatively, the adaptation method can also be used with fuel injectors that work with an inwardly opening nozzle.
Das hier vorgestellte Adaptionsverfahren kommt ferner bevorzugt bei Kraftstoffinjektoren zum Einsatz, die als Direktantrieb der Düsennadel einen Piezoaktuator aufweisen. Hierbei gibt es eine direkte Proportionalität zwischen Steuerspannung und Nadelhub. The adaptation method presented here is furthermore preferably used in fuel injectors which have a piezoactuator as the direct drive of the nozzle needle. There is a direct proportionality between control voltage and needle stroke.
Grundsätzlich kann das Adaptionsverfahren auch bei Kraftstoffinjektoren verwendet werden, deren Direktantrieb mit einem Elektromagneten zum Antreiben der Düsennadel arbeitet. Des Weiteren kann das Adaptionsverfahren auch bei Kraftstoffinjektoren mit hydraulischer Übersetzung zur Steuerung der Düsennadel verwendet werden. Es ist klar, dass mit dem hier vorgestellten Adaptionsverfahren Kraftstoffinjektoren bei selbstzündenden oder bei fremdgezündeten Brennkraftmaschinen adaptiert werden können. Ebenso eignet sich das Adaptionsverfahren sowohl für Brennkraftmaschinen, die mit flüssigen Kraftstoffen betrieben werden, als auch für Brennkraftmaschinen, die mit gasförmigen Kraftstoffen betrieben werden. In principle, the adaptation method can also be used in fuel injectors whose direct drive operates with an electromagnet for driving the nozzle needle. Furthermore, the adaptation method can also be used in fuel injectors with hydraulic transmission for controlling the nozzle needle. It is clear that with the adaptation method presented here, fuel injectors can be adapted for self-igniting or externally ignited internal combustion engines. Likewise, the adaptation method is suitable both for internal combustion engines, which are operated with liquid fuels, as well as for internal combustion engines, which are operated with gaseous fuels.

Claims

Patentansprüche claims
1. Verfahren zum Adaptieren einer elektrischen Ansteuerung eines Kraftstoffinjektors, mit dem Kraftstoff einem Brennraum einer Brennkraftmaschine zugemessen wird, bei dem ein aktueller Betriebszustand der Brennkraftmaschine überwacht und abhängig davon die elektrische Ansteuerung adaptiert wird, 1. A method for adapting an electrical control of a fuel injector, with which fuel is metered into a combustion chamber of an internal combustion engine, in which a current operating state of the internal combustion engine is monitored and depending on which the electrical control is adapted,
dadurch gekennzeichnet,  characterized,
- dass der aktuelle Betriebszustand anhand eines im jeweiligen Brennraum herrschenden Drucks überwacht wird,  that the current operating state is monitored by means of a pressure prevailing in the respective combustion chamber,
- dass abhängig vom gemessenen Druck eine Ist-Arbeit ermittelt wird,  that an actual work is determined depending on the measured pressure,
- dass die ermittelte Ist-Arbeit mit einer dem aktuellen Betriebszustand  - That the determined actual work with a current operating state
zugeordneten Soll-Arbeit verglichen wird,  associated target work is compared,
- dass abhängig vom Soll-Ist-Vergleich der aktuellen Arbeit des jeweiligen  - that depending on the target-actual comparison of the current work of the respective
Brennraums die Adaption der elektrischen Ansteuerung des jeweiligen  Brennraums the adaptation of the electrical control of the respective
Kraftstoffinjektors durchgeführt wird.  Fuel injector is performed.
2. Verfahren nach Anspruch 1 , 2. The method according to claim 1,
dadurch gekennzeichnet,  characterized,
- dass für den jeweiligen Brennraum ein Ist-Druckverlauf gemessen wird,  that an actual pressure profile is measured for the respective combustion chamber,
- dass aus dem gemessenen Ist-Druckverlauf ein indizierter Ist-Mitteldruck ermittelt wird,  that an indicated actual mean pressure is determined from the measured actual pressure curve,
- dass aus dem ermittelten indizierten Ist-Mitteldruck die Ist-Arbeit des jeweiligen Brennraums ermittelt wird. - That the actual work of the respective combustion chamber is determined from the determined indicated actual mean effective pressure.
3. Verfahren nach Anspruch 1 oder 2, 3. The method according to claim 1 or 2,
dadurch gekennzeichnet,  characterized,
dass die Adaption während eines Mehrfacheinspritzbetriebs durchgeführt wird, bei dem der Kraftstoff mittels mehrerer getrennter Einspritzungen dem jeweiligen Brennraum zugeführt wird.  in that the adaptation is carried out during a multiple injection operation, in which the fuel is supplied to the respective combustion chamber by means of a plurality of separate injections.
4. Verfahren nach Anspruch 1 oder 2, 4. The method according to claim 1 or 2,
dadurch gekennzeichnet,  characterized,
dass die Adaption während eines Einfacheinspritzbetriebs durchgeführt wird, bei dem der Kraftstoff mittels einer einzigen Einspritzung dem jeweiligen Brennraum zugeführt wird.  in that the adaptation is carried out during a single injection operation in which the fuel is supplied to the respective combustion chamber by means of a single injection.
5. Verfahren nach einem der Ansprüche 1 bis 4, 5. The method according to any one of claims 1 to 4,
dadurch gekennzeichnet, dass  characterized in that
abhängig vom Soll-Ist-Vergleich ein Hub der Düsennadel korrigiert wird.  Depending on the target-actual comparison, a stroke of the nozzle needle is corrected.
6. Verfahren nach einem der Ansprüche 1 bis 5, 6. The method according to any one of claims 1 to 5,
dadurch gekennzeichnet, dass  characterized in that
eine Düsennadel des Kraftstoff! njektors mittels Direktantrieb gesteuert wird.  a nozzle needle of the fuel! Njektors is controlled by direct drive.
EP11726342.6A 2010-07-15 2011-06-11 Adaptation method Withdrawn EP2593653A1 (en)

Applications Claiming Priority (2)

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DE102010027267A DE102010027267A1 (en) 2010-07-15 2010-07-15 Electrical control adapting method for fuel injector with piezo actuator of e.g. self-ignition internal combustion engine, involves comparing determined work with target-work, and carrying out adaptation based on comparison
PCT/EP2011/002882 WO2012007085A1 (en) 2010-07-15 2011-06-11 Adaptation method

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DE102010027267A1 (en) 2011-04-28

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