EP1692383B1 - Operating method for an actuator of an injection valve - Google Patents

Operating method for an actuator of an injection valve Download PDF

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Publication number
EP1692383B1
EP1692383B1 EP04804645A EP04804645A EP1692383B1 EP 1692383 B1 EP1692383 B1 EP 1692383B1 EP 04804645 A EP04804645 A EP 04804645A EP 04804645 A EP04804645 A EP 04804645A EP 1692383 B1 EP1692383 B1 EP 1692383B1
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EP
European Patent Office
Prior art keywords
actuator
voltage
operating method
injection
short
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EP04804645A
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German (de)
French (fr)
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EP1692383A1 (en
Inventor
Christian Hauser
Heinz Lixl
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Continental Automotive GmbH
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Continental Automotive GmbH
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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
    • F02D41/20—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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2055—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit with means for determining actual opening or closing time
    • 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
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value

Definitions

  • the invention relates to an operating method for an actuator of an injection valve of an internal combustion engine, in particular for a piezoelectric actuator according to the preamble of claim 1.
  • the actuator is not only used for the mechanical control of the injection valve, but also serves as a sensor for determining the valve position of the injection valve.
  • the physical knowledge is utilized that the actuator voltage not only depends on the electrical charge of the actuator, but is also influenced by the force acting on the actuator, which in turn is dependent on the valve position.
  • the piezoactuator is not fully discharged, but maintained at a minimum voltage sufficient to prevent the valve body of the injector seated on the associated valve seat. This is important in the known method of operation, since the valve body of the Injector valve acting hydraulic forces are absorbed by the valve seat and therefore no longer be forwarded to the piezoelectric actuator when the valve body is seated on the valve seat. To detect the valve position by the piezoelectric actuator, therefore, it must always push the valve body out of the valve seat so that the hydraulic forces acting on the valve body can be detected by the piezoactuator in order to determine the valve position of the injection valve.
  • a disadvantage of the known operating method for a piezoelectric actuator is the fact that the piezoelectric actuator can not be completely discharged at the end of an injection process, so that the piezoelectric actuator can still serve as a sensor for determining the valve position.
  • WO 03/081007 A1 is a method for detecting the Einschlagzeittician the valve needle of a piezoelectric actuator known. At the time of impact is the time at which the valve needle strikes the leading piezoelectric actuator and thereby triggers a current pulse, which is used to determine the valve position can be evaluated. Again, the measurement of the actuator current is not in the shorted state.
  • the invention is therefore based on the object to provide an operating method for an actuator of an injection valve of an internal combustion engine, which allows a complete discharge of the piezoelectric actuator at the end of an injection process and still allows a determination of the valve position of the injection valve.
  • a piezoelectric actuator in an injector of an injection system can only serve as a sensor for determining the valve position when the piezoelectric actuator remains at least partially charged so that the piezoelectric actuator can always give the valve body the injection valve from its valve seat.
  • the operating method according to the invention provides that the actuator is short-circuited to terminate an injection process, which can lead to a complete discharge of the piezoelectric actuator, while still a determination of the valve position is possible, as will be described in detail.
  • the invention therefore further provides that the actuator current is detected in the short-circuited state in order to draw conclusions about the valve position.
  • the injection end is preferably determined as a function of the actuator current detected in the short-circuited state.
  • the piezoelectric actuator is discharged very quickly during the short-circuiting and thereby shortened rapidly.
  • the acting in normal operation on the valve body of the injector end face of the piezoelectric actuator is accelerated faster than the valve body itself, which affects the adhesion between the actuator and the valve body and can even lead to an interruption of the frictional connection.
  • the valve body Upon impact of the valve body on the valve seat, the valve body then presses elastically into the valve seat and strikes again on the pre-aligned piezoelectric actuator, so that the piezoelectric actuator emits a current pulse due to the pulse-like pressure action through the valve body.
  • the time position of a current pulse is therefore preferably detected after short-circuiting and determines the end of injection in dependence on the temporal position of the current pulse. For example, the time of the end of injection Depending on the timing of the current pulse are read out of a map, but other ways of determining the end of injection depending on the timing of the current pulse are possible.
  • the measurement of the Aktorstroms for detecting the current pulse is preferably carried out within a predetermined time window after the short-circuiting of the actuator. This is advantageous since the temporal position of the current pulse is roughly known after the short-circuiting of the actuator, so that an accurate and therefore expensive current measurement is required only within the time window of interest.
  • the actuator Upon completion of an injection event, the actuator is preferably initially discharged in a defined manner before short-circuiting in order to prevent overloads.
  • a defined discharge can take place, for example, with a predetermined time constant, which can be set, for example, by a resistor in the discharge circuit of the actuator.
  • the defined discharge of the actuator before short-circuiting preferably takes place up to a fraction of the maximum voltage or maximum charge of the actuator, so that only a relatively small amount of energy has to be dissipated during the subsequent short-circuiting of the actuator.
  • the actuator is charged to initiate an injection process, wherein in each case the actuator voltage during charging or after charging the Actuator is measured in order to derive the start of injection from the measured actuator voltage can.
  • the actuator voltage does not increase continuously, but is also influenced by the hydraulic forces acting on the actuator, as will be explained briefly below.
  • the actuator voltage initially increases continuously at the beginning of an injection process due to the charge until the piezoelectric actuator lifts the valve body of the injection valve from its valve seat.
  • the nozzle needle of the injector moves upward in the direction of the control chamber and thereby increases again acting on the valve body and then on the piezoelectric fuel pressure in the control chamber of the injector, resulting in a renewed increase in the Actuator voltage expresses.
  • the nozzle needle contributes only so long to the increase of the actuator voltage until it has reached its end position. Then, the actuator voltage then drops back to a steady value in which there is a balance between inlet and outlet in the control chamber of the injector.
  • a turning point in the voltage curve is determined at the beginning of an injection process, in order to derive the start of injection.
  • the determination of a point of inflection instead of a local maximum or a local minimum is metrologically safer, since local minima or maxima can also be generated by superimposed interference signals.
  • a further inflection point of the current profile is preferably determined in order to determine the start of injection as a function of the temporal position of both inflection points.
  • the two inflection points for the determination of the injection process are preferably the two inflection points, between which the second local maximum of the actuator voltage, which is caused by the nozzle needle condition.
  • the actuator current is also evaluated to determine the start of injection.
  • the knowledge is exploited that the actuator current between the charging and discharging of the actuator lists vibrations, the beginning of these vibrations and their phase position allows a conclusion on the start of injection.
  • control unit of an injector of an injection system for an internal combustion engine is largely conventional and is used to control a nozzle needle 1, which is mounted linearly displaceable in the control unit and the power injection releases depending on their position or blocks.
  • the control unit consists of three modules 2.1-2.3 arranged one above the other, wherein through the modules 2.1-2.3 a high pressure passage 4 extends, via which the fuel to be injected is supplied.
  • the high pressure passage 4 opens in the lower module 2.3 in a cylindrical channel 5, via which the fuel to be injected reaches the nozzle opening.
  • annular channel 6 is arranged in the lower module 2.3, which surrounds the nozzle needle 1 in an annular manner, wherein another channel diverges from the annular channel 6 on the side opposite the high-pressure channel 4, which opens via an inlet throttle 7 in a control chamber 8.
  • the middle module 2.2 is a valve seat 9 and a slidably mounted valve body 10, wherein the valve body 10, depending on its position, the valve seat 9 releases or blocks.
  • valve body 10 is in this case biased by a spring 11 in the direction of the valve seat, so that the valve body 10 seals without concern of external forces the valve seat 9, so that no fuel can escape from the control chamber 8 upwards.
  • a piezoactuator 12 For the mechanical drive of the valve body 10, a piezoactuator 12 is provided, which presses on a bottom plate 13 and a crank pin 14 on an integrally formed on the upper side of the valve body 10 valve mushroom 15.
  • the piezoelectric actuator 12 can therefore push the valve body 10 out of the valve seat 9 as a function of the electrical voltage applied to the piezoactuator 12 so that fuel can escape from the control chamber 8 through the valve seat 9 and via an outlet throttle (not shown).
  • FIGS. 2a and 2 B illustrated flowchart the operating method of the invention for the piezoelectric actuator 12 described.
  • control signal for an injection start, wherein the control signal is generated by an electronic control unit, which is not shown for simplicity.
  • the piezoelectric actuator 12 Upon arrival of the control signal, the piezoelectric actuator 12 is then charged with a predetermined voltage pulse, wherein the actuator voltage between the times t1 and t2 in the in FIG. 3a displayed timing diagram increases. In this case, the piezoelectric actuator 12 lasts until the piezoelectric actuator 12 then lifts the valve body 10 out of the valve seat 9 at the time t2. From this point on, fuel can then escape from the control chamber 8 through the valve seat 9 upwards and be discharged via an outlet throttle. This initially leads to a pressure drop in the control chamber 8, which manifests itself in a corresponding voltage drop from the time t2.
  • the pressure drop in the control chamber 8 also causes the nozzle needle 1 moves upward, thereby displacing fuel in the control chamber 8, resulting in an increase in pressure in the control room.
  • the caused by the nozzle needle 1 pressure increase in the control chamber 8 then leads to the time t3 again to an increase in the actuator voltage until the nozzle needle 1 has finally reached its upper stop and then no further fuel in the control chamber 8 displaced more.
  • the actuator voltage Upon reaching the upper stop of the nozzle needle 1, the actuator voltage therefore no longer increases, but drops back from the time t3 to a steady value, which is characterized by a balance between inlet to the control chamber 8 and drain from the control chamber 8.
  • the actuator voltage is measured, the voltage curve is evaluated to determine the start of injection. For this purpose, a first inflection point G1 is determined, which occurs between the first local minimum and the second local maximum of the actuator voltage at the beginning of the injection process.
  • a second inflection point G2 is determined, which occurs after the absolute maximum of the actuator voltage. Between these two turning points G1, G2 is the time at which the nozzle needle 1 reaches its upper stop and thereby releases the injector. In the determination of the two turning points G1, G2 are the points in time t, respectively G1 and G2 t measured, at which the two turning points G1, G2 occur.
  • the start of injection is then calculated as a function of the temporal position t G1 , t G2 of the two inflection points G1, G2 and in dependence on the beginning t S of the oscillations 16 and the phase position ⁇ S of the oscillation 16, the time t beginning of the injection process Depending on these variables can also be read from a map.
  • the piezoelectric actuator 12 is then discharged in a controlled manner until time t5, until the piezoelectric actuator 12 is finally short-circuited at time t5.
  • the injection valve does not close at the same time with the short-circuiting of the piezoelectric actuator 12, since the nozzle needle 1 previously has to take their lower stop point.
  • the actuator current I is therefore measured after the time t5 of the short-circuiting of the piezoelectric actuator 12.
  • the piezoelectric actuator 12 during short-circuiting very quickly shortened, which affects the frictional connection between the valve body 10 and the piezoelectric actuator 12 and in extreme cases can even lead to a separation of the piezoelectric actuator 12 of the valve body 10, since the movement of the piezoelectric actuator 12 leads the movement of the valve body 10.
  • t pulse of the current pulse 17 is the actual end t the end of the injection operation is calculated as a function of the temporal position.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The invention relates to an operating method for an actuator of an injection valve of an internal combustion engine, more particularly for a piezo actuator, comprising the following steps: discharging the actuator for concluding an injection process, and detecting the actuator voltage. According to the invention, the actuator is short-circuited for discharging and the actuator voltage is detected while the actuator is in the short-circuited state.

Description

Die Erfindung betrifft ein Betriebsverfahren für einen Aktor eines Einspritzventils einer Brennkraftmaschine, insbesondere für einen Piezoaktor gemäß dem Oberbegriff des Anspruchs 1.The invention relates to an operating method for an actuator of an injection valve of an internal combustion engine, in particular for a piezoelectric actuator according to the preamble of claim 1.

Aus WO 01/63121 ist ein Betriebsverfahren für einen Piezoaktor eines Einspritzventils einer Brennkraftmaschine bekannt, bei dem der Piezoaktor zur Einleitung eines Einspritzvorgangs elektrisch aufgeladen und zur Beendigung des Einspritzvorgangs wieder entladen wird.Out WO 01/63121 an operating method for a piezoelectric actuator of an injection valve of an internal combustion engine is known, in which the piezoelectric actuator for initiating an injection process is electrically charged and discharged again to complete the injection process.

Der Aktor wird hierbei jedoch nicht nur zur mechanischen Ansteuerung des Einspritzventils eingesetzt, sondern dient auch als Sensor zur Ermittlung der Ventilstellung des Einspritzventils. Hierbei wird die physikalische Erkenntnis ausgenutzt, dass die Aktorspannung nicht nur von der elektrischen Ladung des Aktors abhängt, sondern auch durch die auf den Aktor wirkende Kraft beeinflusst wird, die wiederum von der Ventilstellung abhängig ist.However, the actuator is not only used for the mechanical control of the injection valve, but also serves as a sensor for determining the valve position of the injection valve. In this case, the physical knowledge is utilized that the actuator voltage not only depends on the electrical charge of the actuator, but is also influenced by the force acting on the actuator, which in turn is dependent on the valve position.

Darüber hinaus wird in dieser Druckschrift auch erwähnt, dass der Aktorstrom gemessen werden kann, um daraus Rückschlüsse auf die Ventilstellung des Einspritzventils zu ziehen.In addition, it is also mentioned in this publication that the actuator current can be measured in order to draw conclusions about the valve position of the injection valve.

Bei der Beendigung eines Einspritzvorgangs wird der Piezoaktor jedoch nicht vollständig entladen, sondern auf einer Mindestspannung gehalten, die ausreicht, um zu verhindern, dass der Ventilkörper des Einspritzventils auf dem zugehörigen Ventilsitz aufsitzt. Dies ist bei dem bekannten Betriebsverfahren wichtig, da die auf den Ventilkörper des Einspritzventils wirkenden hydraulischen Kräfte von dem Ventilsitz aufgenommen werden und demzufolge nicht mehr an den Piezoaktor weitergeleitet werden, wenn der Ventilkörper auf dem Ventilsitz aufsitzt. Zur Erfassung der Ventilstellung durch den Piezoaktor muss dieser also den Ventilkörper stets aus dem Ventilsitz herausdrücken, damit die auf den Ventilkörper wirkenden hydraulischen Kräfte von dem Piezoaktor erfasst werden können, um die Ventilstellung des Einspritzventils zu ermitteln.However, at the completion of an injection event, the piezoactuator is not fully discharged, but maintained at a minimum voltage sufficient to prevent the valve body of the injector seated on the associated valve seat. This is important in the known method of operation, since the valve body of the Injector valve acting hydraulic forces are absorbed by the valve seat and therefore no longer be forwarded to the piezoelectric actuator when the valve body is seated on the valve seat. To detect the valve position by the piezoelectric actuator, therefore, it must always push the valve body out of the valve seat so that the hydraulic forces acting on the valve body can be detected by the piezoactuator in order to determine the valve position of the injection valve.

Nachteilig an dem bekannten Betriebsverfahren für einen Piezoaktor ist also die Tatsache, dass der Piezoaktor bei der Beendigung eines Einspritzvorgangs nicht vollständig entladen werden kann, damit der Piezoaktor noch als Sensor zur Ermittlung der Ventilstellung dienen kann.A disadvantage of the known operating method for a piezoelectric actuator, therefore, is the fact that the piezoelectric actuator can not be completely discharged at the end of an injection process, so that the piezoelectric actuator can still serve as a sensor for determining the valve position.

Aus DE 36 09 599 A1 ist ein Verfahren zur Steuerung der Entregungszeit von elektromagnetischen Ventilen bei Brennkraftmaschinen bekannt. Auch hierbei wird der Ventilstrom gemessen, um daraus die Ventilstellung abzuleiten. Allerdings betrifft diese Entgegenhaltung nur elektromagnetische Ventile und keine Piezoaktoren. Darüber hinaus erfolgt die Strommessung hierbei nicht im kurzgeschlossenen Zustand der elektromagnetischen Ventile, da die Auswertung im kurzgeschlossenen Zustand nicht möglich ist.Out DE 36 09 599 A1 A method for controlling the de-excitation time of electromagnetic valves in internal combustion engines is known. Again, the valve current is measured to derive the valve position. However, this citation concerns only electromagnetic valves and no piezoelectric actuators. In addition, the current measurement is not done in the short-circuited state of the electromagnetic valves, since the evaluation in the short-circuited state is not possible.

Aus WO 03/081007 A1 ist ein Verfahren zur Detektion des Einschlagzeitpunktes der Ventilnadel eines Piezoaktors bekannt. Bei dem Einschlagzeitpunkt handelt es sich um den Zeitpunkt, zu dem die Ventilnadel auf den vorauseilenden Piezoaktor aufschlägt und dadurch einen Stromimpuls auslöst, der zur Ermittlung der Ventilstellung ausgewertet werden kann. Auch hierbei erfolgt die Messung des Aktorstroms jedoch nicht im kurzgeschlossenen Zustand.Out WO 03/081007 A1 is a method for detecting the Einschlagzeitpunkt the valve needle of a piezoelectric actuator known. At the time of impact is the time at which the valve needle strikes the leading piezoelectric actuator and thereby triggers a current pulse, which is used to determine the valve position can be evaluated. Again, the measurement of the actuator current is not in the shorted state.

Schließlich ist aus DE 198 43 621 A1 eine Entladeschaltung für einen Piezoaktor bekannt, die den Piezoaktor zum Entladen kurzschließt. Das Kurzschließen des Piezoaktors ist hierbei jedoch möglich, weil die Auswertung des Aktorstroms hierbei nicht vorgesehen ist.Finally is off DE 198 43 621 A1 a discharge circuit for a piezoelectric actuator is known, which short-circuits the piezoelectric actuator for discharging. The short-circuiting of the piezoelectric actuator is possible, however, because the evaluation of the actuator current is not provided here.

Der Erfindung liegt deshalb die Aufgabe zugrunde, ein Betriebsverfahren für einen Aktor eines Einspritzventils einer Brennkraftmaschine anzugeben, das eine vollständige Entladung des Piezoaktors am Ende eines Einspritzvorgangs erlaubt und das dabei trotzdem eine Ermittlung der Ventil- stellung des Einspritzventils ermöglicht.The invention is therefore based on the object to provide an operating method for an actuator of an injection valve of an internal combustion engine, which allows a complete discharge of the piezoelectric actuator at the end of an injection process and still allows a determination of the valve position of the injection valve.

Die Aufgabe wird, ausgehend von dem vorstehend bekannten Betriebsverfahren gemäss dem Oberbegriff des Anspruchs1, durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.The object is achieved on the basis of the above-known operating method according to the preamble of claim 1 by the characterizing features of claim 1.

Die Erfindung löst sich von dem technischen Vorurteil, dass ein Piezoaktor in einem Injektor einer Einspritzanlage nur dann als Sensor zur Ermittlung der Ventilstellung dienen kann, wenn der Piezoaktor zumindest teilweise geladen bleibt, damit der Piezoaktor den Ventilkörper das Einspritzventil stets aus seinem Ventilsitz geben kann.The invention is detached from the technical prejudice that a piezoelectric actuator in an injector of an injection system can only serve as a sensor for determining the valve position when the piezoelectric actuator remains at least partially charged so that the piezoelectric actuator can always give the valve body the injection valve from its valve seat.

Stattdessen sieht das erfindungsgemäße Betriebsverfahren vor, dass der Aktor zur Beendigung eines Einspritzvorgangs kurzgeschlossen wird, was zu einer vollständigen Entladung des Piezoaktors führen kann, wobei trotzdem eine Ermittlung der Ventilstellung möglich ist, wie noch eingehend beschrieben wird.Instead, the operating method according to the invention provides that the actuator is short-circuited to terminate an injection process, which can lead to a complete discharge of the piezoelectric actuator, while still a determination of the valve position is possible, as will be described in detail.

Die Erfindung sieht deshalb weiterhin vor, dass der Aktorstrom im kurzgeschlossenen Zustand erfasst wird, um daraus Rückschlüsse auf die Ventilstellung zu ziehen.The invention therefore further provides that the actuator current is detected in the short-circuited state in order to draw conclusions about the valve position.

Vorzugsweise wird in Abhängigkeit von dem im kurzgeschlossenen Zustand erfassten Aktorstrom das Einspritzende ermittelt. Hierbei wird die Erkenntnis ausgenutzt, dass der Piezoaktor während des Kurzschließens sehr schnell entladen wird und sich dadurch rasch verkürzt. Die im normalen Betrieb auf den Ventilkörper des Einspritzventils wirkende Stirnfläche des Piezoaktors wird dabei stärker beschleunigt als der Ventilkörper selbst, was den Kraftschluss zwischen dem Aktor und dem Ventilkörper beeinflusst und sogar zu einer Unterbrechung des Kraftschlusses führen kann. Beim Auftreffen des Ventilkörpers auf den Ventilsitz drückt der Ventilkörper dann elastisch in den Ventilsitz und trifft dabei wieder auf den vorausgeeilten Piezoaktor auf, so dass der Piezoaktor aufgrund der impulsartigen Druckeinwirkung durch den Ventilkörper einen Stromimpuls abgibt.The injection end is preferably determined as a function of the actuator current detected in the short-circuited state. Here, the knowledge is exploited that the piezoelectric actuator is discharged very quickly during the short-circuiting and thereby shortened rapidly. The acting in normal operation on the valve body of the injector end face of the piezoelectric actuator is accelerated faster than the valve body itself, which affects the adhesion between the actuator and the valve body and can even lead to an interruption of the frictional connection. Upon impact of the valve body on the valve seat, the valve body then presses elastically into the valve seat and strikes again on the pre-aligned piezoelectric actuator, so that the piezoelectric actuator emits a current pulse due to the pulse-like pressure action through the valve body.

Im Rahmen des erfindungsgemäßen Betriebsverfahrens wird deshalb vorzugsweise nach dem Kurzschließen die zeitliche Lage eines Stromimpulses erfasst und das Einspritzende in Abhängigkeit von der zeitlichen Lage des Stromimpulses bestimmt. Beispielsweise kann der Zeitpunkt des Einspritzendes in Abhängigkeit von der zeitlichen Lage des Stromimpulses aus einem Kennfeld ausgelesen werden, jedoch sind auch andere Arten der Bestimmung des Einspritzendes in Abhängigkeit von der zeitlichen Lage des Stromimpulses möglich.In the context of the operating method according to the invention, the time position of a current pulse is therefore preferably detected after short-circuiting and determines the end of injection in dependence on the temporal position of the current pulse. For example, the time of the end of injection Depending on the timing of the current pulse are read out of a map, but other ways of determining the end of injection depending on the timing of the current pulse are possible.

Darüber hinaus erfolgt die Messung des Aktorstroms zur Erkennung des Stromimpulses vorzugsweise innerhalb eines vorgegebenen Zeitfensters nach dem Kurzschließen des Aktors. Dies ist vorteilhaft, da die zeitliche Lage des Stromimpulses nach dem Kurzschließen des Aktors grob bekannt ist, so dass eine genaue und damit aufwendige Strommessung nur innerhalb des interessierenden Zeitfensters erforderlich ist.In addition, the measurement of the Aktorstroms for detecting the current pulse is preferably carried out within a predetermined time window after the short-circuiting of the actuator. This is advantageous since the temporal position of the current pulse is roughly known after the short-circuiting of the actuator, so that an accurate and therefore expensive current measurement is required only within the time window of interest.

Bei der Beendigung eines Einspritzvorgangs wird der Aktor vor dem Kurzschließen vorzugsweise zunächst definiert entladen, um Überlastungen zu verhindern. Eine derartige definierte Entladung kann beispielsweise mit einer vorgegebenen Zeitkonstante erfolgen, die beispielsweise durch einen Widerstand im Entladekreis des Aktors eingestellt werden kann.Upon completion of an injection event, the actuator is preferably initially discharged in a defined manner before short-circuiting in order to prevent overloads. Such a defined discharge can take place, for example, with a predetermined time constant, which can be set, for example, by a resistor in the discharge circuit of the actuator.

Die definierte Entladung des Aktors vor dem Kurzschließen erfolgt vorzugsweise bis auf einen Bruchteil der Maximalspannung bzw. Maximalladung des Aktors, so dass beim nachfolgenden Kurzschließen des Aktors nur noch eine relativ geringe Energie abgeführt werden muss.The defined discharge of the actuator before short-circuiting preferably takes place up to a fraction of the maximum voltage or maximum charge of the actuator, so that only a relatively small amount of energy has to be dissipated during the subsequent short-circuiting of the actuator.

In einer Variante der Erfindung von eigener schutzwürdiger Bedeutung wird nicht nur das Einspritzende vermittelt, sondern auch der Einspritzbeginn. Hierbei wird der Aktor zur Einleitung eines Einspritzvorgangs aufgeladen, wobei jeweils die Aktorspannung beim Aufladen oder nach dem Aufladen des Aktors gemessen wird, um den Einspritzbeginn aus der gemessenen Aktorspannung ableiten zu können.In a variant of the invention of own worthy importance not only the injection end is mediated, but also the start of injection. In this case, the actuator is charged to initiate an injection process, wherein in each case the actuator voltage during charging or after charging the Actuator is measured in order to derive the start of injection from the measured actuator voltage can.

Bei der Beurteilung des Spannungsverlaufs zu Beginn eines Einspritzvorgangs ist zu berücksichtigen, dass die Aktorspannung nicht kontinuierlich ansteigt, sondern auch durch die auf den Aktor wirkenden hydraulischen Kräfte beeinflusst wird, wie im Folgenden kurz erläutert wird.When assessing the voltage profile at the beginning of an injection process, it should be taken into account that the actuator voltage does not increase continuously, but is also influenced by the hydraulic forces acting on the actuator, as will be explained briefly below.

So steigt die Aktorspannung zu Beginn eines Einspritzvorgangs aufgrund der Aufladung zunächst kontinuierlich an, bis der Piezoaktor den Ventilkörper des Einspritzventils aus seinem Ventilsitz hebt.Thus, the actuator voltage initially increases continuously at the beginning of an injection process due to the charge until the piezoelectric actuator lifts the valve body of the injection valve from its valve seat.

Daraufhin kann Kraftstoff aus dem Steuerraum des Injektors entweichen, woraufhin der auf den Ventilkörper und damit auch auf den Piezoaktor wirkende Kraftstoffdruck abfällt, was sich in einer kurzfristigen Spannungsabnahme äußert.Thereupon, fuel can escape from the control chamber of the injector, whereupon the fuel pressure acting on the valve body and thus also on the piezoelectric actuator drops, which manifests itself in a short-term decrease in voltage.

Mit dem Abfall des Kraftstoffdrucks im Steuerraum des Injektors bewegt sich jedoch die Düsennadel des Injektors nach oben in Richtung des Steuerraums und erhöht dadurch wieder den auf den Ventilkörper und dann auch auf den Piezoaktor wirkenden Kraftstoffdruck im Steuerraum des Injektors, was sich in einem erneuten Anstieg der Aktorspannung äußert.With the drop in the fuel pressure in the control chamber of the injector, however, the nozzle needle of the injector moves upward in the direction of the control chamber and thereby increases again acting on the valve body and then on the piezoelectric fuel pressure in the control chamber of the injector, resulting in a renewed increase in the Actuator voltage expresses.

Die Düsennadel trägt jedoch nur so lange zum Anstieg der Aktorspannung bei, bis sie ihre Endstellung erreicht hat. Anschließend fällt die Aktorspannung dann wieder auf einen stationären Wert ab, in dem in dem Steuerraum des Injektors ein Gleichgewicht zwischen Zulauf und Ablauf besteht.However, the nozzle needle contributes only so long to the increase of the actuator voltage until it has reached its end position. Then, the actuator voltage then drops back to a steady value in which there is a balance between inlet and outlet in the control chamber of the injector.

In einem bevorzugten Ausführungsbeispiel der Erfindung wird zu Beginn eines Einspritzvorgangs ein Wendepunkt im Spannungsverlauf ermittelt, um daraus den Einspritzbeginn abzuleiten. Die Bestimmung eines Wendepunkts anstelle eines lokalen Maximums oder eines lokalen Minimums ist messtechnisch sicherer, da lokale Minima bzw. Maxima auch durch überlagerte Störsignale erzeugt werden können.In a preferred embodiment of the invention, a turning point in the voltage curve is determined at the beginning of an injection process, in order to derive the start of injection. The determination of a point of inflection instead of a local maximum or a local minimum is metrologically safer, since local minima or maxima can also be generated by superimposed interference signals.

Vorzugsweise wird darüber hinaus ein weiterer Wendepunkt des Stromverlaufs ermittelt, um den Einspritzbeginn in Abhängigkeit von der zeitlichen Lage beider Wendepunkte zu ermitteln.In addition, a further inflection point of the current profile is preferably determined in order to determine the start of injection as a function of the temporal position of both inflection points.

Bei den beiden Wendepunkten für die Bestimmung des Einspritzvorgangs handelt es sich vorzugsweise um die beiden Wendepunkte, zwischen denen das zweite lokale Maximum der Aktorspannung liegt, das durch die Düsennadelbedingung verursacht wird.The two inflection points for the determination of the injection process are preferably the two inflection points, between which the second local maximum of the actuator voltage, which is caused by the nozzle needle condition.

In einer weiteren Variante der Erfindung wird zur Bestimmung des Einspritzbeginns auch der Aktorstrom ausgewertet. Hierbei wird die Erkenntnis ausgenutzt, dass der Aktorstrom zwischen dem Aufladen und dem Entladen des Aktors Schwingungen aufführt, wobei der Beginn dieser Schwingungen und deren Phasenlage einen Rückschluss auf den Einspritzbeginn zulässt.In a further variant of the invention, the actuator current is also evaluated to determine the start of injection. In this case, the knowledge is exploited that the actuator current between the charging and discharging of the actuator lists vibrations, the beginning of these vibrations and their phase position allows a conclusion on the start of injection.

Andere vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet oder werden nachstehend zusammen mit der Beschreibung des bevorzugten Ausführungsbeispiels der Erfindung anhand der Figuren näher erläutert. Es zeigen:

Figur 1
eine Querschnittsansicht einer Steuereinheit eines Injektors für eine Einspritzanlage einer Brenn- kraftmaschine,
Figuren 2a und 2b
das erfindungsgemäße Betriebsverfahren in Form eines Flussdiagramms sowie
Figur 3a-3c
Aktorspannung, Kraftstoffstrom und Aktorstrom in Form von Zeitdiagrammen.
Other advantageous developments of the invention are characterized in the subclaims or are explained in more detail below together with the description of the preferred embodiment of the invention with reference to the figures. Show it:
FIG. 1
FIG. 2 shows a cross-sectional view of a control unit of an injector for an injection system of an internal combustion engine, FIG.
FIGS. 2a and 2b
the operating method according to the invention in the form of a flowchart and
Figure 3a-3c
Actuator voltage, fuel flow and actuator current in the form of timing diagrams.

Die in Figur 1 dargestellte Steuereinheit eines Injektors einer Einspritzanlage für eine Brennkraftmaschine ist weitgehend herkömmlich aufgebaut und dient zur Ansteuerung einer Düsennadel 1, die in der Steuereinheit linear verschiebbar gelagert ist und die Kraftstromeinspritzung in Abhängigkeit von ihrer Position freigibt oder sperrt.In the FIG. 1 shown control unit of an injector of an injection system for an internal combustion engine is largely conventional and is used to control a nozzle needle 1, which is mounted linearly displaceable in the control unit and the power injection releases depending on their position or blocks.

Die Steuereinheit besteht aus drei übereinander angeordneten Modulen 2.1-2.3, wobei durch die Module 2.1-2.3 ein Hochdruckkanal 4 verläuft, über den der einzuspritzende Kraftstoff zugeführt wird. Der Hochdruckkanal 4 mündet in dem unteren Modul 2.3 in einen zylindrischen Kanal 5, über den der einzuspritzende Kraftstoff zu der Düsenöffnung gelangt.The control unit consists of three modules 2.1-2.3 arranged one above the other, wherein through the modules 2.1-2.3 a high pressure passage 4 extends, via which the fuel to be injected is supplied. The high pressure passage 4 opens in the lower module 2.3 in a cylindrical channel 5, via which the fuel to be injected reaches the nozzle opening.

Darüber hinaus ist in dem unteren Modul 2.3 ein Ringkanal 6 angeordnet, der die Düsennadel 1 ringförmig umgibt, wobei von dem Ringkanal 6 auf der dem Hochdruckkanal 4 gegenüber liegenden Seite ein weiterer Kanal abzweigt, der über eine Zulaufdrossel 7 in einem Steuerraum 8 mündet.In addition, an annular channel 6 is arranged in the lower module 2.3, which surrounds the nozzle needle 1 in an annular manner, wherein another channel diverges from the annular channel 6 on the side opposite the high-pressure channel 4, which opens via an inlet throttle 7 in a control chamber 8.

In dem mittleren Modul 2.2 befindet sich ein Ventilsitz 9 und ein verschiebbar gelagerter Ventilkörper 10, wobei der Ventilkörper 10 in Abhängigkeit von seiner Position den Ventilsitz 9 freigibt oder sperrt.In the middle module 2.2 is a valve seat 9 and a slidably mounted valve body 10, wherein the valve body 10, depending on its position, the valve seat 9 releases or blocks.

Der Ventilkörper 10 wird hierbei durch eine Feder 11 in Richtung auf den Ventilsitz vorgespannt, so dass der Ventilkörper 10 ohne Anliegen äußerer Kräfte den Ventilsitz 9 abdichtet, so dass kein Kraftstoff aus dem Steuerraum 8 nach oben entweichen kann.The valve body 10 is in this case biased by a spring 11 in the direction of the valve seat, so that the valve body 10 seals without concern of external forces the valve seat 9, so that no fuel can escape from the control chamber 8 upwards.

Zum mechanischen Antrieb des Ventilkörpers 10 ist ein Piezoaktor 12 vorgesehen, der über eine Bodenplatte 13 und einen Hubzapfen 14 auf einen an der Oberseite des Ventilkörpers 10 angeformten Ventilpilz 15 drückt. Der Piezoaktor 12 kann also den Ventilkörper 10 in Abhängigkeit von der an den Piezoaktor 12 angelegten elektrischen Spannung aus dem Ventilsitz 9 herausdrücken, so dass Kraftstoff aus dem Steuerraum 8 durch den Ventilsitz 9 und über eine nicht dargestellte Ablaufdrossel entweichen kann.For the mechanical drive of the valve body 10, a piezoactuator 12 is provided, which presses on a bottom plate 13 and a crank pin 14 on an integrally formed on the upper side of the valve body 10 valve mushroom 15. The piezoelectric actuator 12 can therefore push the valve body 10 out of the valve seat 9 as a function of the electrical voltage applied to the piezoactuator 12 so that fuel can escape from the control chamber 8 through the valve seat 9 and via an outlet throttle (not shown).

Im Folgenden wird nun unter Bezugnahme auf das in den Figuren 2a und 2b dargestellte Flussdiagramm das erfindungsgemäße Betriebsverfahren für den Piezoaktor 12 beschrieben.The following is now with reference to the in the FIGS. 2a and 2 B illustrated flowchart the operating method of the invention for the piezoelectric actuator 12 described.

Zunächst wird abgewartet, ob ein Steuersignal für einen Einspritzbeginn vorliegt, wobei das Steuersignal von einer elektronischen Steuereinheit erzeugt wird, die zur Vereinfachung nicht dargestellt ist.First, it is to be seen whether there is a control signal for an injection start, wherein the control signal is generated by an electronic control unit, which is not shown for simplicity.

Beim Eintreffen des Steuersignals wird der Piezoaktor 12 dann mit einem vorgegebenen Spannungsimpuls aufgeladen, wobei die Aktorspannung zwischen den Zeitpunkten t1 und t2 in dem in Figur 3a dargestellten Zeitdiagramm ansteigt. Dabei längt sich der Piezoaktor 12, bis der Piezoaktor 12 dann zum Zeitpunkt t2 den Ventilkörper 10 aus dem Ventilsitz 9 hebt. Ab diesem Zeitpunkt kann dann Kraftstoff aus dem Steuerraum 8 durch den Ventilsitz 9 hindurch nach oben entweichen und über eine Ablaufdrossel abgeführt werden. Dies führt zunächst zu einem Druckabfall in dem Steuerraum 8, was sich in einem entsprechenden Spannungsabfall ab dem Zeitpunkt t2 äußert.Upon arrival of the control signal, the piezoelectric actuator 12 is then charged with a predetermined voltage pulse, wherein the actuator voltage between the times t1 and t2 in the in FIG. 3a displayed timing diagram increases. In this case, the piezoelectric actuator 12 lasts until the piezoelectric actuator 12 then lifts the valve body 10 out of the valve seat 9 at the time t2. From this point on, fuel can then escape from the control chamber 8 through the valve seat 9 upwards and be discharged via an outlet throttle. This initially leads to a pressure drop in the control chamber 8, which manifests itself in a corresponding voltage drop from the time t2.

Der Druckabfall in dem Steuerraum 8 führt jedoch auch dazu, dass sich die Düsennadel 1 nach oben bewegt und dabei Kraftstoff in dem Steuerraum 8 verdrängt, was zu einer Druckerhöhung in dem Steuerraum führt. Die durch die Düsennadel 1 verursachte Druckerhöhung in dem Steuerraum 8 führt dann bis zum Zeitpunkt t3 wieder zu einem Anstieg der Aktorspannung, bis die Düsennadel 1 schließlich ihren oberen Anschlag erreicht hat und dann keinen weiteren Kraftstoff im Steuerraum 8 mehr verdrängt. Beim Erreichen des oberen Anschlags der Düsennadel 1 steigt die Aktorspannung also nicht mehr an, sondern fällt ab dem Zeitpunkt t3 wieder auf einen stationären Wert ab, der durch ein Gleichgewicht zwischen Zulauf zu dem Steuerraum 8 und Ablauf aus dem Steuerraum 8 gekennzeichnet ist.However, the pressure drop in the control chamber 8 also causes the nozzle needle 1 moves upward, thereby displacing fuel in the control chamber 8, resulting in an increase in pressure in the control room. The caused by the nozzle needle 1 pressure increase in the control chamber 8 then leads to the time t3 again to an increase in the actuator voltage until the nozzle needle 1 has finally reached its upper stop and then no further fuel in the control chamber 8 displaced more. Upon reaching the upper stop of the nozzle needle 1, the actuator voltage therefore no longer increases, but drops back from the time t3 to a steady value, which is characterized by a balance between inlet to the control chamber 8 and drain from the control chamber 8.

Während dieses Vorgangs wird die Aktorspannung gemessen, wobei der Spannungsverlauf ausgewertet wird, um den Einspritzbeginn zu ermitteln. Hierzu wird ein erster Wendepunkt G1 bestimmt, der zwischen dem ersten lokalen Minimum und dem zweiten lokalen Maximum der Aktorspannung zu Beginn des Einspritzvorgangs auftritt.During this process, the actuator voltage is measured, the voltage curve is evaluated to determine the start of injection. For this purpose, a first inflection point G1 is determined, which occurs between the first local minimum and the second local maximum of the actuator voltage at the beginning of the injection process.

Darüber hinaus wird ein zweiter Wendepunkt G2 ermittelt, der nach dem absoluten Maximum der Aktorspannung auftritt. Zwischen diesen beiden Wendepunkten G1, G2 liegt der Zeitpunkt, zu dem die Düsennadel 1 ihren oberen Anschlag erreicht und dadurch die Einspritzdüse freigibt. Bei der Bestimmung der beiden Wendepunkte G1, G2 werden jeweils die Zeitpunkte tG1 und tG2 gemessen, an denen die beiden Wendepunkte G1, G2 auftreten.In addition, a second inflection point G2 is determined, which occurs after the absolute maximum of the actuator voltage. Between these two turning points G1, G2 is the time at which the nozzle needle 1 reaches its upper stop and thereby releases the injector. In the determination of the two turning points G1, G2 are the points in time t, respectively G1 and G2 t measured, at which the two turning points G1, G2 occur.

Während der stationären Phase der Aktorspannung nach dem Zeitpunkt tG2 führt der in Figur 3c dargestellte Aktorstrom eine Schwingung 16 aus, wobei der Beginn ts und die Phasenlage ebenfalls einen Rückschluss auf den tatsächlichen Einspritzbeginn zulassen. Im Rahmen des erfindungsgemäßen Betriebsverfahrens werden deshalb auch die beiden Größen tS und ϕS gemessen.During the stationary phase of the actuator voltage after the time t G2 , the in Figure 3c Aktorstrom shown an oscillation 16, wherein the beginning t s and the phase position also allow a conclusion on the actual injection start. As part of the operating method according to the invention, therefore, the two variables t S and φ S are measured.

Anschließend wird der Einspritzbeginn dann in Abhängigkeit von der zeitlichen Lage tG1, tG2 der beiden Wendepunkte G1, G2 sowie in Abhängigkeit von dem Beginn tS der Schwingungen 16 und der Phasenlage ϕS der Schwingung 16 berechnet, wobei der Zeitpunkt tBeginn des Einspritzvorgangs in Abhängigkeit von diesen Größen auch aus einem Kennfeld ausgelesen werden kann.Subsequently, the start of injection is then calculated as a function of the temporal position t G1 , t G2 of the two inflection points G1, G2 and in dependence on the beginning t S of the oscillations 16 and the phase position φ S of the oscillation 16, the time t beginning of the injection process Depending on these variables can also be read from a map.

Ab dem Zeitpunkt t4 wird der Piezoaktor 12 dann bis zum Zeitpunkt t5 kontrolliert entladen, bis der Piezoaktor 12 dann schließlich im Zeitpunkt t5 kurzgeschlossen wird.From the time t4, the piezoelectric actuator 12 is then discharged in a controlled manner until time t5, until the piezoelectric actuator 12 is finally short-circuited at time t5.

Das Einspritzventil schließt jedoch nicht zeitgleich mit dem Kurzschließen des Piezoaktors 12, da die Düsennadel 1 zuvor noch ihren unteren Anschlagspunkt einnehmen muss. Zur Ermittlung des tatsächlichen Einspritzendes wird deshalb nach dem Zeitpunkt t5 des Kurzschließens des Piezoaktors 12 der Aktorstrom I gemessen. Hierbei wird die Erkenntnis ausgenutzt, dass sich der Piezoaktor 12 beim Kurzschließen sehr schnell verkürzt, was den Kraftschluss zwischen dem Ventilkörper 10 und dem Piezoaktor 12 beeinflusst und im Extremfall sogar zu einer Trennung des Piezoaktors 12 von dem Ventilkörper 10 führen kann, da die Bewegung des Piezoaktors 12 der Bewegung des Ventilkörpers 10 vorauseilt. Wenn der nacheilende Ventilkörper 10 dann auf den Ventilsitz 9 auftrifft, presst der Ventilkörper 10 elastisch in Richtung des Piezoaktors 12, was beim Auftreffen des Ventilkörpers 10 auf den Piezoaktor 12 zu einem Stromimpuls 17 führt. Die zeitliche Lage tPuls des Stromimpulses 17 ermöglicht hierbei einen Rückschluss auf das tatsächliche Ende des Einspritzvorgangs. Im Rahmen des erfindungsgemäßen Betriebsverfahrens wird deshalb in Abhängigkeit von der zeitlichen Lage tPuls des Stromimpulses 17 das tatsächliche Ende tEnde des Einspritzvorgangs berechnet. However, the injection valve does not close at the same time with the short-circuiting of the piezoelectric actuator 12, since the nozzle needle 1 previously has to take their lower stop point. To determine the actual end of injection, the actuator current I is therefore measured after the time t5 of the short-circuiting of the piezoelectric actuator 12. Here, the knowledge is exploited that the piezoelectric actuator 12 during short-circuiting very quickly shortened, which affects the frictional connection between the valve body 10 and the piezoelectric actuator 12 and in extreme cases can even lead to a separation of the piezoelectric actuator 12 of the valve body 10, since the movement of the piezoelectric actuator 12 leads the movement of the valve body 10. When the trailing valve body 10 then impinges on the valve seat 9, the valve body 10 presses elastically in the direction of the piezoactuator 12, which leads to a current pulse 17 when the valve body 10 strikes the piezoactuator 12. The temporal position t pulse of the current pulse 17 in this case allows a conclusion to the actual end of the injection process. Therefore, in the context of the operating method according to the invention t pulse of the current pulse 17 is the actual end t the end of the injection operation is calculated as a function of the temporal position.

Claims (11)

  1. Operating method for an actuator (12) of an injection valve of an internal combustion engine, in particular for a piezoactuator, comprising the following steps:
    - discharging the actuator (12) in order to conclude an injection process,
    - detecting the actuator voltage,
    characterised in that
    the actuator (12) is short-circuited for discharging purposes and the actuator voltage is detected while the actuator is in the short-circuited state.
  2. Operating method according to claim 1,
    characterised in that
    the injection end is determined as a function of the actuator voltage detected while the actuator is in the short-circuited state.
  3. Operating method according to claim 1 or 2,
    characterised in that
    the actuator voltage is detected in a predetermined time window after the short-circuiting of the actuator (12).
  4. Operating method according to one of the preceding claims,
    characterised by
    the following steps:
    - detecting the temporal position of a current pulse (17) of the actuator voltage after the short-circuiting,
    - determining the injection end as a function of the temporal position of the current pulse (17).
  5. Operating method according to one of the preceding claims,
    characterised in that
    the actuator (12) is discharged so rapidly in order to conclude the injection process that the frictional connection between the actuator (12) and a nozzle needle (1) or ventilator body (10) powered by the actuator (12) is briefly disconnected and then re-establishes again if the nozzle needle (12) or the valve body (10) follows the actuator movement.
  6. Operating method according to one of the preceding claims
    characterised in that
    the actuator (12) is initially discharged in a defined fashion prior to the short-circuiting.
  7. Operating method according to claim 6,
    characterised in that
    the actuator (12) is discharged to a fractional amount of its maximum voltage prior to short-circuiting.
  8. Operating method according to one of the preceding claims,
    characterised by
    the following steps:
    - charging the actuator (12) in order to initiate an injection process,
    - detecting the actuator voltage during and/or after the charging the actuator (12) in order to identify an injection start
    - determining a first turning point (G1) of the curve of the actuator voltage,
    with the first turning point (G1) temporally lying between the first local minimum of the voltage curve and the first local maximum of the voltage curve during the charging process,
    - determining the injection start as a function of the temporal position of the first turning point (G10.
  9. Operating method according to claim 8,
    characterised by
    the following steps:
    - determining a second turning point (G2) of the curve of the actuator voltage,
    that the second turning point (G2) temporally lies between the second local maximum of the current curve and the second local minimum of the current curve during the charging process,
    - determining the injection start as a function of the temporal position of the second turning point (G2).
  10. Operating method according to one of the preceding claims,
    characterised by
    - detecting the actuator voltage between the charging and the discharging of the actuator (12),
    - detecting the start and/or phase position of an oscillation of the actuator voltage during a stationary phase of the actuator voltage,
    - determining the injection start as a function of the start and/or phase position of the oscillation of the actuator current.
  11. Operating method according to one of the preceding claims,
    characterised by
    the following steps:
    - electrical activation of the actuator (12),
    - regulating the electrical activation as a function of the determined injection start and/or the determined injection end.
EP04804645A 2003-12-09 2004-12-02 Operating method for an actuator of an injection valve Expired - Fee Related EP1692383B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10357480 2003-12-09
PCT/EP2004/053220 WO2005059339A1 (en) 2003-12-09 2004-12-02 Operating method for an actuator of an injection valve

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EP1692383B1 true EP1692383B1 (en) 2010-11-10

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Publication number Priority date Publication date Assignee Title
DE102008061586B4 (en) * 2008-12-11 2015-08-20 Continental Automotive Gmbh Method and device for controlling a solid state actuator
DE102014209326A1 (en) * 2014-05-16 2015-11-19 Robert Bosch Gmbh Method for determining a closing time of a fuel injector
DE102017008950A1 (en) 2017-09-25 2019-03-28 Daimler Ag Method for operating an injector of an internal combustion engine, in particular for a motor vehicle

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DE3609599A1 (en) 1986-03-21 1987-09-24 Bosch Gmbh Robert METHOD FOR CONTROLLING THE DEACTIVATION TIME OF ELECTROMAGNETIC DEVICES, ESPECIALLY ELECTROMAGNETIC VALVES IN INTERNAL COMBUSTION ENGINES
DE19843621B4 (en) 1998-09-23 2006-03-30 Siemens Ag Discharge circuit for a capacitive actuator
DE19930309C2 (en) * 1999-07-01 2001-12-06 Siemens Ag Method and device for regulating the injection quantity in a fuel injection valve with a piezo element actuator
EP1172541B1 (en) * 2000-07-01 2005-03-23 Robert Bosch GmbH Piezoelectric actuator for injector and/or injection system
WO2003081007A1 (en) 2002-03-27 2003-10-02 Siemens Aktiengesellschaft Method and device for detecting the moment of impact of the valve needle of a piezo control valve

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