EP1397592A1 - Injector comprising a piezo actuator - Google Patents

Injector comprising a piezo actuator

Info

Publication number
EP1397592A1
EP1397592A1 EP02767152A EP02767152A EP1397592A1 EP 1397592 A1 EP1397592 A1 EP 1397592A1 EP 02767152 A EP02767152 A EP 02767152A EP 02767152 A EP02767152 A EP 02767152A EP 1397592 A1 EP1397592 A1 EP 1397592A1
Authority
EP
European Patent Office
Prior art keywords
injector
piezo actuator
piezo
control valve
determined
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.)
Granted
Application number
EP02767152A
Other languages
German (de)
French (fr)
Other versions
EP1397592B1 (en
Inventor
Werner Remmels
Arne Schneemann
Bernd Danckert
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.)
Rolls Royce Solutions GmbH
Original Assignee
MTU Friedrichshafen GmbH
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 MTU Friedrichshafen GmbH filed Critical MTU Friedrichshafen GmbH
Publication of EP1397592A1 publication Critical patent/EP1397592A1/en
Application granted granted Critical
Publication of EP1397592B1 publication Critical patent/EP1397592B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/005—Fuel-injectors combined or associated with other devices the devices being sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/167—Means for compensating clearance or thermal expansion
    • 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
    • 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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/24—Fuel-injection apparatus with sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • F02M59/468—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means using piezoelectric operating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing

Definitions

  • the invention relates to an injector for an injection system of an internal combustion engine, which has a piezo actuator, a control valve, a nozzle needle and a detection means for detecting the presence or opening of the piezo actuator on the control valve.
  • the injector with piezo actuator shown therein also has a detection means. This consists of an electrical contact and a compensator circuit. The electrical contact is created by the contact surfaces of the piezo actuator and the control valve. When the piezo actuator is in contact with the control valve, a closed circuit is created from the piezo actuator / control valve to the compensator circuit.
  • the problem with this solution is the isolation of the piezo actuator within the injector and the changing contact resistance due to deposits.
  • the object of the invention is to determine the opening and closing times more reliably in the case of an injector with a piezo actuator.
  • the detection means comprises a piezo element. This is preferably integrated in the piezo actuator. One element of the piezo actuator is therefore used for force measurement.
  • a gap is provided between the piezo actuator and the control valve. Changes in length of the piezo actuator Due to the temperature, the injector does not necessarily open.
  • the presence / opening of the piezo actuator is recognized by the fact that a measurement voltage applied to the piezo element exceeds a limit value.
  • the measured voltage determined is then set as decisive for the further control of the injector.
  • a weighted measurement voltage is determined from a predeterminable number of determined measurement voltages and this is set as decisive for the further control of the injector.
  • the invention offers the advantage of a corresponding durability of the injector. Due to the precise, reproducible knowledge of the opening behavior of the injector, cylinder-specific regulation of the injection is possible. As a follow-up reaction, the torque contributions and the peak pressure of the individual cylinders can be adjusted to one another.
  • Figure 1 is a sectional view of the injector
  • Figure 2 is a schematic diagram for the mechanical translation
  • the injector 1 shows a sectional view of an injector.
  • the general function of the injector is assumed to be known in the following.
  • the injector 1 consists of a base body 7, a nozzle 5 and a union nut 6.
  • a nozzle needle 9 is arranged inside the nozzle 5.
  • a piezo actuator 2 and a control valve 8 with a valve body 10 are located within the base body 7.
  • the state of the nozzle needle 9, that is to say the injection time and the injection quantity, is determined via the electrical actuation of the piezo actuator.
  • a piezo element 3 of the piezo actuator 2 is used here
  • a measurement voltage Um of the piezo element 3 is evaluated by an electronic control unit (EDC) 4.
  • EDC electronice control unit
  • the level of the measurement voltage Um changes. If the measurement voltage exceeds a limit value, this is recognized by the electronic control unit 4. This measuring voltage is then set as decisive for the further control of the injector.
  • a weighted measuring voltage is determined from a predeterminable number of determined measuring voltages. This can e.g. B. arithmetic averaging. The weighted measuring voltage is then used as decisive for the further operation of the injector.
  • FIG 2 shows a schematic diagram for a mechanical translation in the injector 1.
  • the mechanical translation is exemplified as a lever 11 with sections A and B.
  • a valve 13 is opened against the force of a closing device 12.
  • the pressure level p of the fuel is present at the valve 13.
  • the lever 1 1 is shown in dashed lines in the open position.
  • the piezo actuator 2 is deactivated, the valve 13 is closed again via the closing device 12.
  • the use of a mechanical translation offers the advantage that the piezo actuator can be made shorter.
  • the injector is securely closed via the locking device 12 even if the electronic control fails.
  • the invention offers the advantage that it is easy to carry out.
  • the wear-free determination of the application of the piezo actuator is a corresponding one

Landscapes

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

Abstract

For an internal combustion engine, an injector (1) with piezo actuator (2) is provided. In addition, there is provided a means for recognition for recognizing the lying position or opening of the piezo actuator (2) on a control valve. The means for recognition includes a piezo element (3).

Description

Injektor mit Piezo-Aktuator Injector with piezo actuator
Die Erfindung betrifft einen Injektor für ein Einspritzsystem einer Brennkraftmaschine, der einen Piezo-Aktuator, ein Steuerventil, eine Düsennadel und ein Erkennungsmittel zum Erkennen des Anliegens oder Öffnens des Piezo-Aktuators am Steuerventil aufweist.The invention relates to an injector for an injection system of an internal combustion engine, which has a piezo actuator, a control valve, a nozzle needle and a detection means for detecting the presence or opening of the piezo actuator on the control valve.
Bei der Verwendung eines Injektors mit Piezo-Aktuator tritt in der Praxis das Problem auf, dass sich die Länge des Piezo-Aktuators über der Temperatur verändert. Diese temperaturabhängige Längenänderung des Piezo-Aktuators verursacht ein uneinheitliches Offnungs- bzw. Schließverhalten des Injektors und bewirkt einen nicht reproduzierbaren Einspritzzeitpunkt und Einspritzverlauf.When using an injector with a piezo actuator, the problem arises in practice that the length of the piezo actuator changes over temperature. This temperature-dependent change in length of the piezo actuator causes a non-uniform opening or closing behavior of the injector and causes a non-reproducible injection timing and injection process.
Eine Lösung für die beschriebene Problematik ist aus der DE 199 29 589 A1 bekannt. Der darin dargestellte Injektor mit Piezo-Aktuator besitzt zusätzlich ein Erkennungsmittel. Dieses besteht aus einem elektrischen Kontakt und einer Kompensatorschaltung. Der elektrische Kontakt entsteht durch die Berührungsflächen des Piezo-Aktuators und des Steuerventils. Bei Anliegen des Piezo-Aktuators am Steuerventil entsteht somit ein geschlossener Stromkreis von Piezo-Aktuator/Steuerventil zur Kompensatorschaltung. Problematisch bei dieser Lösung ist die Isolation des Piezo-Aktuators innerhalb des Injektors sowie der sich verändernde Übergangswiderstand auf Grund von Ablagerungen.A solution to the problem described is known from DE 199 29 589 A1. The injector with piezo actuator shown therein also has a detection means. This consists of an electrical contact and a compensator circuit. The electrical contact is created by the contact surfaces of the piezo actuator and the control valve. When the piezo actuator is in contact with the control valve, a closed circuit is created from the piezo actuator / control valve to the compensator circuit. The problem with this solution is the isolation of the piezo actuator within the injector and the changing contact resistance due to deposits.
Der Erfindung liegt die Aufgabe zugrunde bei einem Injektor mit Piezo-Aktuator den Offnungs- bzw. Schließzeitpunkt sicherer zu bestimmen.The object of the invention is to determine the opening and closing times more reliably in the case of an injector with a piezo actuator.
Die Aufgabe wird durch die Merkmale des ersten Anspruchs gelöst. Die Ausgestaltung hierzu sind in den Unteransprüchen dargestellt.The object is achieved by the features of the first claim. The design for this is shown in the subclaims.
Die Erfindung sieht vor, dass das Erkennungsmittel ein Piezo-Element umfasst. Vorzugsweise ist dieses im Piezo-Aktuator integriert. Ein Element des Piezo-Aktuators wird also zur Kraftmessung verwendet. Im Ausgangszustand ist ein Spalt zwischen dem Piezo- Aktuator und dem Steuerventil vorgesehen. Längenänderungen des Piezo-Aktuators aufgrund der Temperatur führen somit nicht zwangsweise zu einem Öffnen des Injektors. Das Anliegen/Öffnen des Piezo-Aktuators wird daran erkannt, dass eine am Piezo-Element anliegende Messspannung einen Grenzwert übersteigt. Die ermittelte Messspannung wird sodann als maßgeblich für die weitere Ansteuerung des Injektors gesetzt. Alternativ ist vorgesehen, dass aus einer vorgebbaren Anzahl von ermittelten Messspannungen eine gewichtete Messspannung bestimmt wird und diese als maßgeblich für die weitere Ansteuerung des Injektors gesetzt wird. Die Erfindung bietet den Vorteil einer entsprechenden Dauerhaltbarkeit des Injektors. Durch die genaue, reproduzierbare, Kenntnis des Öffnungsverhaltens des Injektors ist eine zylinderindividuelle Regelung der Einspritzung möglich. Als Folgereaktion können die Momenten-Beiträge und der Spitzendruck der einzelnen Zylinder einander angepasst werden.The invention provides that the detection means comprises a piezo element. This is preferably integrated in the piezo actuator. One element of the piezo actuator is therefore used for force measurement. In the initial state, a gap is provided between the piezo actuator and the control valve. Changes in length of the piezo actuator Due to the temperature, the injector does not necessarily open. The presence / opening of the piezo actuator is recognized by the fact that a measurement voltage applied to the piezo element exceeds a limit value. The measured voltage determined is then set as decisive for the further control of the injector. Alternatively, it is provided that a weighted measurement voltage is determined from a predeterminable number of determined measurement voltages and this is set as decisive for the further control of the injector. The invention offers the advantage of a corresponding durability of the injector. Due to the precise, reproducible knowledge of the opening behavior of the injector, cylinder-specific regulation of the injection is possible. As a follow-up reaction, the torque contributions and the peak pressure of the individual cylinders can be adjusted to one another.
In den Zeichnungen ist ein Ausführungsbeispiel dargestellt. Es zeigt:An exemplary embodiment is shown in the drawings. It shows:
Figur 1 ein Schnittbild des InjektorsFigure 1 is a sectional view of the injector
Figur 2 eine Prinzipdarstellung für die mechanische ÜbersetzungFigure 2 is a schematic diagram for the mechanical translation
In der Figur 1 ist ein Schnittbild eines Injektors dargestellt. Die allgemeine Funktion des Injektors wird im folgenden als bekannt vorausgesetzt. Der Injektor 1 besteht aus einem Grundkörper 7, einer Düse 5 und einer Überwurfmutter 6. Innerhalb der Düse 5 ist eine Düsennadel 9 angeordnet. Innerhalb des Grundkörpers 7 befindet sich ein Piezo-Aktuator 2 und ein Steuerventil 8 mit einem Ventilkörper 10. Über die elektrische Ansteuerung des Piezo-Aktuators wird der Zustand der Düsennadel 9, also der Einspritzzeitpunkt und die Einspritzmenge, bestimmt. Ein Piezo-Element 3 des Piezo-Aktuators 2 wird hierbei zur1 shows a sectional view of an injector. The general function of the injector is assumed to be known in the following. The injector 1 consists of a base body 7, a nozzle 5 and a union nut 6. A nozzle needle 9 is arranged inside the nozzle 5. A piezo actuator 2 and a control valve 8 with a valve body 10 are located within the base body 7. The state of the nozzle needle 9, that is to say the injection time and the injection quantity, is determined via the electrical actuation of the piezo actuator. A piezo element 3 of the piezo actuator 2 is used here
Kraftmessung verwendet. Anstelle eines Piezo-Aktuators kann selbstverständlich auch ein mechanisch oder elektromagnetisch aktivierbare Betätigungseinrichtung verwendet werden. Eine Messspannung Um des Piezo-Elements 3 wird von einem elektronischen Steuergerät (EDC) 4 ausgewertet. Im Ausgangszustand besteht zwischen dem Steuerventil 8 und dem Piezo-Element 3 ein Spalt s, siehe hierzu Ansicht x. Über diesen Spalt s werden Längenänderungen des Piezo-Aktuators 2 ausgeglichen. Wenn das Piezo-Element 3 am Steuerventil 8 zur Anlage kommt, ändert sich der Pegel der Messspannung Um. Wenn die Messspannung Um einen Grenzwert übersteigt, wird dies vom elektronischen Steuergerät 4 erkannt. Für die weitere Ansteuerung des Injektors wird sodann diese Messspannung als maßgeblich gesetzt. Als Alternative ist vorgesehen, dass aus einer vorgebbaren Anzahl von ermittelten Messspannungen eine gewichtete Messspannung bestimmt wird. Dies kann z. B. über arithmetische Mittelwertbildung erfolgen. Die gewichtete Messspannung wird sodann als maßgeblich für den weiteren Betrieb des Injektors verwendet.Force measurement used. Instead of a piezo actuator, it is of course also possible to use an actuating device which can be activated mechanically or electromagnetically. A measurement voltage Um of the piezo element 3 is evaluated by an electronic control unit (EDC) 4. In the initial state, there is a gap s between the control valve 8 and the piezo element 3, see view x. Changes in length of the piezo actuator 2 are compensated for via this gap s. If the piezo element 3 on Control valve 8 comes to rest, the level of the measurement voltage Um changes. If the measurement voltage exceeds a limit value, this is recognized by the electronic control unit 4. This measuring voltage is then set as decisive for the further control of the injector. As an alternative, it is provided that a weighted measuring voltage is determined from a predeterminable number of determined measuring voltages. This can e.g. B. arithmetic averaging. The weighted measuring voltage is then used as decisive for the further operation of the injector.
Figur 2 zeigt eine Prinzipdarstellung für eine mechanische Übersetzung im Injektor 1. Die mechanische Übersetzung ist exemplarisch als Hebel 11 mit den Abschnitten A und B dargestellt. Bei Aktivierung des Piezo-Aktuators 2 wird ein Ventil 13 entgegen der Kraft einer Schließeinrichtung 12 geöffnet. An dem Ventil 13 steht das Druckniveau p des Kraftstoffs an. In Figur 2 ist der Hebel 1 1 in der geöffneten Stellung gestrichelt dargestellt. Bei Deaktivierung des Piezo-Aktuators 2 wird über die Schließeinrichtung 12 das Ventil 13 wieder geschlossen. Die Verwendung einer mechanischen Übersetzung bietet den Vorteil, dass der Piezo-Aktuator kürzer ausgeführt werden kann. Über die Schließeinrichtung 12 wird der Injektor auch bei Ausfall der elektronischen Ansteuerung sicher geschlossen.Figure 2 shows a schematic diagram for a mechanical translation in the injector 1. The mechanical translation is exemplified as a lever 11 with sections A and B. When the piezo actuator 2 is activated, a valve 13 is opened against the force of a closing device 12. The pressure level p of the fuel is present at the valve 13. In Figure 2, the lever 1 1 is shown in dashed lines in the open position. When the piezo actuator 2 is deactivated, the valve 13 is closed again via the closing device 12. The use of a mechanical translation offers the advantage that the piezo actuator can be made shorter. The injector is securely closed via the locking device 12 even if the electronic control fails.
Die Erfindung bietet den Vorteil, dass diese einfach auszuführen ist. Über die verschleißfreie Bestimmung des Anliegens des Piezo-Aktuators ist eine entsprechendeThe invention offers the advantage that it is easy to carry out. The wear-free determination of the application of the piezo actuator is a corresponding one
Dauerhaltbarkeit des Injektors gegeben. Hierdurch kann eine zylinderindividuelle Regelung der Einspritzung realisiert werden. Durability of the injector given. This enables cylinder-specific control of the injection to be implemented.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
Injektorinjector
Piezo-AktuatorPiezo actuator
Piezo-Element elektronisches Steuergerät (EDC)Piezo element electronic control unit (EDC)
Düsejet
ÜberwurfmutterNut
Grundkörperbody
Steuerventilcontrol valve
Düsennadelnozzle needle
Ventilkörpervalve body
Hebellever
Schließvorrichtungclosing device
Ventil Valve

Claims

PATENTANSPRÜCHE
1. Injektor für ein Einspritzsystem einer Brennkraftmaschine, der einen Piezo- Aktuator, ein Steuerventil, eine Düsennadel und ein Erkennungsmittel zum Erkennen des Anliegens oder Öffnens des Piezo-Aktuators am Steuerventil aufweist, dadurch gekennzeichnet, dass das Erkennungsmittel ein Piezo-Element (3) umfasst.1. Injector for an injection system of an internal combustion engine, which has a piezo actuator, a control valve, a nozzle needle and a detection means for detecting the presence or opening of the piezo actuator on the control valve, characterized in that the detection means comprises a piezo element (3) includes.
2. Injektor (1) nach Anspruch 1, dadurch gekennzeichnet, dass das Piezo- Element (3) im Piezo-Aktuator (2) integriert wird.2. Injector (1) according to claim 1, characterized in that the piezo element (3) in the piezo actuator (2) is integrated.
3. Injektor (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass ein Anliegen/Öffnen des Piezo-Aktuators (2) erkannt wird, wenn eine am Piezo-Element (3) anliegende Messspannung (Um) einen Grenzwert (GW) übersteigt (Um>GW).3. Injector (1) according to claim 1 or 2, characterized in that an application / opening of the piezo actuator (2) is detected when a measuring voltage (Um) applied to the piezo element (3) exceeds a limit value (GW) (Um> GW).
4. Injektor (1) nach Anspruch 3, dadurch gekennzeichnet, dass die ermittelte Messspannung (Um) als maßgeblich für die weitere Ansteuerung des Injektors (1) gesetzt wird.4. Injector (1) according to claim 3, characterized in that the determined measurement voltage (Um) is set as decisive for the further control of the injector (1).
5. Injektor (1) nach Anspruch 3, dadurch gekennzeichnet, dass aus einer vorgebbare Anzahl (i) von ermittelten Messspannungen (Um(i)) ein gewichtete5. Injector (1) according to claim 3, characterized in that from a predetermined number (i) of determined measuring voltages (Um (i)) a weighted
Messspannung (Um(MW)) bestimmt wird und als maßgeblich für die weitere Ansteuerung des Injektors (1) gesetzt wird.Measuring voltage (Um (MW)) is determined and set as decisive for the further control of the injector (1).
6. Injektor (1) nach einem der vorausgegangenen Ansprüche, dadurch gekennzeichnet, dass im Injektor (1) eine mechanische Übersetzung angeordnet wird, mittels der ein Wirkhub des Piezo-Aktuators (2) auf eine Schließvorrichtung (12) übersetzt wird. 6. Injector (1) according to one of the preceding claims, characterized in that a mechanical translation is arranged in the injector (1), by means of which an effective stroke of the piezo actuator (2) is translated to a closing device (12).
EP02767152A 2001-06-20 2002-06-18 Injector comprising a piezo actuator Expired - Lifetime EP1397592B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10129375 2001-06-20
DE10129375A DE10129375B4 (en) 2001-06-20 2001-06-20 Injector with piezo actuator
PCT/EP2002/006678 WO2003001049A1 (en) 2001-06-20 2002-06-18 Injector comprising a piezo actuator

Publications (2)

Publication Number Publication Date
EP1397592A1 true EP1397592A1 (en) 2004-03-17
EP1397592B1 EP1397592B1 (en) 2004-12-01

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02767152A Expired - Lifetime EP1397592B1 (en) 2001-06-20 2002-06-18 Injector comprising a piezo actuator

Country Status (5)

Country Link
US (1) US20040149840A1 (en)
EP (1) EP1397592B1 (en)
AT (1) ATE283974T1 (en)
DE (2) DE10129375B4 (en)
WO (1) WO2003001049A1 (en)

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DE10328573A1 (en) * 2003-06-25 2005-01-13 Robert Bosch Gmbh Fuel injector
DE102004022958A1 (en) * 2004-05-10 2005-12-22 Siemens Ag Fuel injector with a correctable setting of an idle stroke of an actuator unit
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DE10129375A1 (en) 2003-01-02
DE50201684D1 (en) 2005-01-05
DE10129375B4 (en) 2005-10-06
WO2003001049A1 (en) 2003-01-03
US20040149840A1 (en) 2004-08-05
EP1397592B1 (en) 2004-12-01

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