EP3055550A1 - Injection valve and method for the operation of an injection valve - Google Patents

Injection valve and method for the operation of an injection valve

Info

Publication number
EP3055550A1
EP3055550A1 EP14795965.4A EP14795965A EP3055550A1 EP 3055550 A1 EP3055550 A1 EP 3055550A1 EP 14795965 A EP14795965 A EP 14795965A EP 3055550 A1 EP3055550 A1 EP 3055550A1
Authority
EP
European Patent Office
Prior art keywords
needle body
injection valve
valve
piezoelectric actuator
injection
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
EP14795965.4A
Other languages
German (de)
French (fr)
Other versions
EP3055550B1 (en
Inventor
Hui Li
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.)
Continental Automotive GmbH
Original Assignee
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP3055550A1 publication Critical patent/EP3055550A1/en
Application granted granted Critical
Publication of EP3055550B1 publication Critical patent/EP3055550B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/701—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger mechanical
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic

Definitions

  • the invention relates to an injection valve and a method for operating the injection valve.
  • the object on which the invention is based is to provide an injection valve and a method for operating the injection valve, which contribute to achieving a high injection accuracy of the injection valve.
  • the invention is characterized by an injection valve.
  • the injection valve has an injector body with a recess with a fluid inlet and a fluid outlet.
  • the injection valve has a needle body which is arranged to be axially movable in the recess of the injector body and which in a closed position of the needle body prevents fluid flow through an injection opening of the injector body and otherwise releases it.
  • the injection valve has a control chamber, which is arranged in the recess and which is arranged hydraulically between the fluid inlet and the fluid outlet.
  • the injection valve has a control valve with a valve body, which is arranged in the control chamber and which is designed to prevent a fluid flow between the control chamber and the fluid outlet in a closed position of the valve body and otherwise release.
  • the injection valve has a piezoactuator, which is mechanically coupled to the control valve via a first transformer for opening the control valve, wherein the piezoactuator is additionally mechanically coupled to the needle body for closing the injection valve.
  • the piezoelectric actuator is mechanically coupled to the needle body via a second transformer, which is connected to the needle body.
  • the piezoelectric actuator is mechanically coupled to the needle body after overcoming a predetermined idle stroke between the second transformer and the piezoelectric actuator.
  • the invention is characterized by a method for operating the injection valve or an advantageous embodiment of the injection valve.
  • the piezoactuator is electrically discharged to open the control valve by means of the first transformer and thereby to open the injection valve.
  • a time of a first mechanical bounce is detected, which is transmitted to the piezoactuator by the mechanical coupling of the piezoactuator with the needle body when a predetermined opening position of the needle body is reached.
  • a point in time of a further mechanical bounce is detected by means of the piezoactuator, which is achieved by the mechanical coupling of the piezoactuator with the needle body when reaching the Closed position of the needle body is transmitted to the piezoelectric actuator.
  • the time of the first mechanical bounce and / or the time of the further mechanical bounce can be detected. These two times or one of the two times can be used for the control of the injection valve in order to achieve a high injection accuracy.
  • FIG. 1 to Figure 6 an injection valve to different
  • Figure 7 shows different operating modes of the injection valve
  • FIG. 8 shows a flowchart for operating the injection valve. Elements of the same construction or function are identified across the figures with the same reference numerals.
  • FIGS. 1 to 6 show an injection valve 1 at different operating times.
  • the injection valve 1 will be explained in more detail with reference to FIG 2.
  • the injection valve 1 has an injector body 2.
  • the injector body 2 has a recess 3, as well as a fluid inlet 7 and a fluid outlet 9.
  • the fluid inlet 7 is hydraulically coupled, for example, to a high-pressure fuel accumulator , such as a so-called common rail, and is thus supplied, for example, with a fuel at a pressure of, for example, up to 2500 bar.
  • the fluid drain 9 is hydraulically coupled to a low pressure region, such as a fuel tank.
  • the injection valve 1 has a needle body 10, which is arranged axially movable in the recess 3 of the injector body 2.
  • a ⁇ injection valve 1 is thus closed.
  • the needle body 10 In an opening position of the needle body 10, the needle body 10 is predetermined axially spaced from the associated valve seat and thereby releases a fluid flow through the injection port 12.
  • the injection valve 1 is thus opened.
  • the injection valve 1 has a control chamber 15, which is arranged in the recess 3 and which is arranged hydraulically between the fluid inlet 7 and the fluid outlet 9.
  • the recess in particular comprises the space around the needle body 10, a hydraulic connecting line to the control chamber 15 and the control chamber 15 itself.
  • the injection valve 1 has a control valve 16 with a valve body 17.
  • the control valve 16 is arranged in the control chamber 15. In a closed position of the valve body 17, the valve body 17 rests on an associated valve seat of the injector body 2, whereby a fluid flow between the control chamber 15 and the fluid outlet 9 is prevented.
  • valve body 17 In an opening position of the valve body 17, the valve body 17 is predetermined axially spaced from the associated valve seat and thus releases the fluid flow between the control chamber 15 and the fluid outlet 9.
  • the injection valve 1 has a piezoactuator 20, which is coupled to the control valve 16 via a first transformer 23 for opening the control valve 16.
  • the piezoelectric actuator 20 is mechanically coupled to the needle body 10 mechanically, for example, after overcoming a predetermined idle stroke L, for example a second transmitter 24 connected to the needle body 10.
  • the injection valve 1 can be ⁇ driven in various operating modes.
  • Figure 7 shows three modes of operation.
  • a first operating mode is a so-called filling stroke injection FSI.
  • the injection valve 1 is opened for a predetermined time and then closed again.
  • Another operating mode is a so-called part stroke injection PSI.
  • the injection valve 1 is opened only briefly and immediately ge ⁇ closed.
  • Another mode of operation is a so-called boost injection BI.
  • FIG. 8 shows a flow diagram of a program for operating the injection valve 1.
  • the program can be executed, for example, by a control device SV.
  • step S1 the piezoactuator 20 is in a charged state (see FIG. 1).
  • step S1 the piezoactuator 20 is in a charged state (see FIG. 1).
  • step S1 the piezoactuator 20 is in a charged state (see FIG. 1).
  • step 1 The recess 3 is filled in step 1 by the fluid inlet 7 with fuel at high pressure.
  • the valve body 17 of the control valve 16 is in the closed position. Furthermore, there is a further balance of forces of the needle body 10 in the closed ⁇ position.
  • step S3 the piezoactuator 20 is electrically discharged.
  • the beginning of step S3 represents the time OPP1 in which the opening operation of the injection valve 1 starts.
  • a time of a first mechanical bounce is detected by means of the piezoactuator 20.
  • the first mechanical bouncing arises from the fact that the second transmitter 24 overcomes the idle stroke L due to the axial movement of the needle body 10 and abuts against the piezoactuator 20.
  • the needle body 10 reaches the predetermined opening position ( Figure 3).
  • the time of detection of the first mechanical bounce thus represents the time OPP2, in which the needle body 10 reaches the predetermined opening position.
  • the program is continued after a predetermined period of time in a step S7. If the injection valve 1 is operated in the operating mode partial stroke injection PSI, the program is continued in step S7 immediately after the detection of the first mechanical bounce. If the injection valve 1 is operated in the operating mode boot injection BI, then the program is continued after a predetermined period of time in the step S3 and continued after the renewed reaching of the step S5 after a further predetermined period of time in the step S7.
  • step S7 depending on the detected time of the first mechanical bounce, the piezoactuator 20 is electrically charged, for example in a subsequent work cycle of the injection valve 1 or in the same work cycle of the injection valve 1 in which the first mechanical bounce was detected.
  • the beginning of the step represents the time OPP3 in which the closing operation of the injection valve 1 starts.
  • this expands and thus presses the needle body 10 into its closed position by means of the mechanical coupling with the needle body 10 or with the second transmitter 24, whereby the fluid flow through the injection opening 12 is again suppressed (see FIG. 4, FIG. FIG. 5).
  • a time of a further mechanical ⁇ African bounce is detected by means of the piezo actuator 20th
  • the further mechanical bouncing is caused by the impact of the needle body 10 on the associated valve seat in reaching the closed position of the needle body 10.
  • This further me ⁇ chanical bouncing is transmitted via the needle body 10 and the second transformer 24 to the piezoelectric actuator 20.
  • the time of the further mechanical bounce thus represents the time OPP4, in which the needle body 10 reaches the closed position.
  • the program is optionally continued after a predetermined period of time in step S3 and another cycle begins.
  • the injection valve 1 can fill in the operation modes by means of these time points stroke injection FSI, part stroke injection PSI and the boot injection BI are regulated. In this way, a very high injection accuracy can be achieved, in particular for these operating modes.

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)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention relates to an injection valve (1), comprising: an injector body (2) having a cut-out (3), a fluid inlet (7), and a fluid outlet (9); a needle body (10), which is arranged such that the needle body (10) can move axially in the cut-out (3) of the injector body (2) and which prevents a fluid flow through an injection opening (12) of the injector body (2) when the needle body (10) is in a closed position and allows said fluid flow otherwise; a control chamber (15), which is arranged in the cut-out (3) and is arranged hydraulically between the fluid inlet (7) and the fluid outlet (9); a control valve (16) having a valve body (17), which is arranged in the control chamber (15) and is configured to prevent a fluid flow between the control chamber (15) and the fluid outlet (9) when the valve body (17) is in a closed position and to allow said fluid flow otherwise; a piezoactuator (20), which is coupled mechanically to the control valve (16) via a first carrier (23), for opening the control valve (16), wherein the piezoactuator (20) can also be coupled mechanically to the needle body (10) to close the injection valve (1).

Description

Beschreibung description
Einspritzventil und Verfahren zum Betreiben eines Einspritzventils Injection valve and method for operating an injection valve
Die Erfindung betrifft ein Einspritzventil und ein Verfahren zum Betreiben des Einspritzventils. The invention relates to an injection valve and a method for operating the injection valve.
Wegen immer strengeren gesetzlichen Vorschriften bezüglich zulässiger Schadstoffemissionen von Brennkraftmaschinen ist eine Einspritzgenauigkeit von Einspritzventilen der Brennkraftmaschine von zentraler Bedeutung. Due to increasingly stringent statutory regulations regarding permissible pollutant emissions from internal combustion engines, injection accuracy of injection valves of the internal combustion engine is of central importance.
Die Aufgabe, die der Erfindung zugrunde liegt, ist es ein Einspritzventil und ein Verfahren zum Betreiben des Ein- spritzventils zu schaffen, die dazu beitragen, dass eine hohe Einspritzgenauigkeit des Einspritzventils erreicht wird. The object on which the invention is based is to provide an injection valve and a method for operating the injection valve, which contribute to achieving a high injection accuracy of the injection valve.
Die Aufgabe wird gelöst durch die Merkmale der unabhängigen Patentansprüche. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen gekennzeichnet. The object is solved by the features of the independent claims. Advantageous embodiments of the invention are characterized in the subclaims.
Gemäß einem ersten Aspekt zeichnet sich die Erfindung aus durch ein Einspritzventil. Das Einspritzventil weist einen Injek- torkörper mit einer Ausnehmung mit einem Fluidzulauf und einem Fluidablauf auf. Das Einspritzventil weist einen Nadelkörper auf, der axial beweglich in der Ausnehmung des Injektorkörpers angeordnet ist und der in einer Schließposition des Nadelkörpers einen Fluidfluss durch eine Einspritzöffnung des Injektorkörpers unterbindet und ansonsten frei gibt. Das Einspritzventil weist einen Steuerraum auf, der in der Ausnehmung angeordnet ist und der hydraulisch zwischen dem Fluidzulauf und dem Fluidablauf angeordnet ist. Das Einspritzventil weist ein Steuerventil auf mit einem Ventilkörper, das in dem Steuerraum angeordnet ist und das dazu ausgebildet ist, in einer Schließposition des Ventilkörpers einen Fluidfluss zwischen dem Steuerraum und dem Fluidablauf zu unterbinden und ansonsten freizugeben. Das Einspritzventil weist einen Piezoaktuator auf, der mechanisch mit dem Steuerventil über einen ersten Übertrager gekoppelt ist zum Öffnen des Steuerventils, wobei der Piezoaktuator zusätzlich mechanisch mit dem Nadelkörper koppelbar ist zum Schließen des Einspritzventils . Durch die mechanische Kopplung des Nadelkörpers mit dem Pie¬ zoaktuator kann mittels des Piezoaktuators mechanisches Prellen detektiert werden. Die Zeitpunkte zu denen das mechanische Prellen auftritt, können für eine Regelung des Einspritzventils genutzt werden, um somit eine hohe Einspritzgenauigkeit zu erreichen. Derartige Zeitpunkte sind insbesondere das Erreichen der Schließposition des Nadelkörpers, sowie das Erreichen einer vorgegebenen Öffnungsposition des Nadelkörpers. According to a first aspect, the invention is characterized by an injection valve. The injection valve has an injector body with a recess with a fluid inlet and a fluid outlet. The injection valve has a needle body which is arranged to be axially movable in the recess of the injector body and which in a closed position of the needle body prevents fluid flow through an injection opening of the injector body and otherwise releases it. The injection valve has a control chamber, which is arranged in the recess and which is arranged hydraulically between the fluid inlet and the fluid outlet. The injection valve has a control valve with a valve body, which is arranged in the control chamber and which is designed to prevent a fluid flow between the control chamber and the fluid outlet in a closed position of the valve body and otherwise release. The injection valve has a piezoactuator, which is mechanically coupled to the control valve via a first transformer for opening the control valve, wherein the piezoactuator is additionally mechanically coupled to the needle body for closing the injection valve. By the mechanical coupling of the needle body with the Pie ¬ zoaktuator mechanical bounce can be detected by means of the piezo actuator. The times at which the mechanical bounce occurs, can be used for a control of the injection valve, thus achieving a high injection accuracy. Such times are in particular the achievement of the closed position of the needle body, as well as the achievement of a predetermined opening position of the needle body.
Gemäß einer vorteilhaften Ausgestaltung ist der Piezoaktuator mechanisch mit dem Nadelkörper über einen zweiten Übertrager koppelbar, der mit dem Nadelkörper verbunden ist. According to an advantageous embodiment of the piezoelectric actuator is mechanically coupled to the needle body via a second transformer, which is connected to the needle body.
Hierdurch kann besonders gut ein mechanisches Prellen von dem Nadelkörper auf den Piezoaktuator übertragen werden. As a result, mechanical bouncing can be transferred from the needle body to the piezoactuator particularly well.
Gemäß einer weiteren vorteilhaften Ausgestaltung ist der Piezoaktuator mechanisch mit dem Nadelkörper gekoppelt nach Überwinden eines vorgegebenen Leerhubs zwischen dem zweiten Übertrager und dem Piezoaktuator. According to a further advantageous embodiment of the piezoelectric actuator is mechanically coupled to the needle body after overcoming a predetermined idle stroke between the second transformer and the piezoelectric actuator.
Hierdurch wird sichergestellt, dass der Piezoaktuator nicht immer mechanisch mit dem Nadelkörper gekoppelt ist, so dass beispielsweise bei dem Erreichen der vorgegebenen Öff- nungsposition des Nadelkörpers ein mechanisches Prellen ent¬ steht . This ensures that the piezoactuator is not always mechanically coupled to the needle body, so that, for example, when the predefined opening is reached, tion position of the needle body a mechanical bouncing ent ¬ stands.
Gemäß einer weiteren vorteilhaften Ausgestaltung ist der Piezoaktuator mechanisch mit dem Nadelkörper gekoppelt beiAccording to a further advantageous embodiment of the piezoelectric actuator is mechanically coupled to the needle body at
Erreichen der Schließposition des Nadelkörpers und bei Erreichen einer vorgegebenen Öffnungsposition des Nadelkörpers. Reaching the closed position of the needle body and upon reaching a predetermined opening position of the needle body.
Hierdurch kann insbesondere ein mechanisches Prellen bei Er- reichen der Schließposition detektiert werden, sowie bei Erreichen der vorgegebenen Öffnungsposition. In this way, in particular a mechanical bouncing can be detected upon reaching the closed position, as well as upon reaching the predetermined opening position.
Gemäß einem weiteren Aspekt zeichnet sich die Erfindung aus durch ein Verfahren zum Betreiben des Einspritzventils oder einer vorteilhaften Ausgestaltung des Einspritzventils. Der Piezoaktuator wird elektrisch entladen zum Öffnen des Steuerventils mittels des ersten Übertragers und hierdurch zum Öffnen des Einspritzventils. Mittels des Piezoaktuators wird ein Zeitpunkt eines ersten mechanischen Prellens detektiert, das durch die mechanische Kopplung des Piezoaktuators mit dem Nadelkörper bei Erreichen einer vorgegebenen Öffnungsposition des Nadelkörpers auf den Piezoaktuator übertragen wird. Abhängig von dem de- tektierten Zeitpunkt des ersten mechanischen Prellens wird der Piezoaktuator elektrisch geladen zum Schließen des Ein- spritzventils mittels der mechanischen Kopplung des Piezoaktuators mit dem Nadelkörper, beispielsweise in einem Folge¬ arbeitszyklus des Einspritzventils oder in demselben Ar¬ beitszyklus des Einspritzventils, in dem das erste mechanische Prellen detektiert wurde. According to a further aspect, the invention is characterized by a method for operating the injection valve or an advantageous embodiment of the injection valve. The piezoactuator is electrically discharged to open the control valve by means of the first transformer and thereby to open the injection valve. By means of the piezoactuator, a time of a first mechanical bounce is detected, which is transmitted to the piezoactuator by the mechanical coupling of the piezoactuator with the needle body when a predetermined opening position of the needle body is reached. Depending on the de- tektierten time of the first mechanical bouncing of the piezo actuator is electrically charged to the closing of the injection valve by means of the mechanical coupling of the piezo actuator with the needle body, for example in a subsequent ¬ duty cycle of the injection valve or in the same Ar ¬ beitszyklus of the injection valve, in the first mechanical bounce was detected.
Gemäß einer vorteilhaften Ausgestaltung wird mittels des Piezoaktuators ein Zeitpunkt eines weiteren mechanischen Prellens detektiert, das durch die mechanische Kopplung des Piezoaktuators mit dem Nadelkörper bei Erreichen der Schließposition des Nadelkörpers auf dem Piezoaktuator übertragen wird. According to an advantageous embodiment, a point in time of a further mechanical bounce is detected by means of the piezoactuator, which is achieved by the mechanical coupling of the piezoactuator with the needle body when reaching the Closed position of the needle body is transmitted to the piezoelectric actuator.
Durch die mechanische Kopplung des Piezoaktuators mit dem Nadelkörper können der Zeitpunkt des ersten mechanischen Prellens und/oder der Zeitpunkt des weiteren mechanischen Prellens detektiert werden. Diese beiden Zeitpunkte oder einer der beiden Zeitpunkte können für die Regelung des Einspritzventils genutzt werden um somit eine hohe Einspritzgenauigkeit zu erreichen. Due to the mechanical coupling of the piezoactuator with the needle body, the time of the first mechanical bounce and / or the time of the further mechanical bounce can be detected. These two times or one of the two times can be used for the control of the injection valve in order to achieve a high injection accuracy.
Die Erfindung ist im Folgenden anhand der schematischen The invention is described below with reference to the schematic
Zeichnungen näher erläutert. Es zeigen: Drawings explained in more detail. Show it:
Figur 1 bis Figur 6 ein Einspritzventil zu verschiedenen Figure 1 to Figure 6 an injection valve to different
Betriebs Zeitpunkten, Figur 7 verschiedene Betriebsmodi des Einspritzventils und  Operating times, Figure 7 shows different operating modes of the injection valve and
Figur 8 ein Ablaufdiagramm zum Betreiben des Einspritzventils. Elemente gleicher Konstruktion oder Funktion sind figurenübergreifend mit den gleichen Bezugszeichen gekennzeichnet. FIG. 8 shows a flowchart for operating the injection valve. Elements of the same construction or function are identified across the figures with the same reference numerals.
Die Figuren 1 bis 6 zeigen ein Einspritzventil 1 zu verschiedenen Betriebszeitpunkten. Das Einspritzventil 1 wird anhand der Figur 2 näher erläutert. Figures 1 to 6 show an injection valve 1 at different operating times. The injection valve 1 will be explained in more detail with reference to FIG 2.
Das Einspritzventil 1 weist einen Injektorkörper 2 auf. Der Injektorkörper 2 weist eine Ausnehmung 3 auf, sowie einen Fluidzulauf 7 und einen Fluidablauf 9. Der Fluidzulauf 7 ist beispielsweise mit einem Kraftstoff¬ hochdruckspeicher, wie beispielsweise einem sogenannten Com- mon-Rail, hydraulisch gekoppelt und wird somit beispielsweise mit einem Kraftstoff unter einem Druck von beispielsweise bis zu 2500 Bar versorgt. The injection valve 1 has an injector body 2. The injector body 2 has a recess 3, as well as a fluid inlet 7 and a fluid outlet 9. The fluid inlet 7 is hydraulically coupled, for example, to a high-pressure fuel accumulator , such as a so-called common rail, and is thus supplied, for example, with a fuel at a pressure of, for example, up to 2500 bar.
Der Fluidablauf 9 ist mit einem Niederdruckbereich, wie beispielsweise mit einem Kraftstofftank hydraulisch gekoppelt. Das Einspritzventil 1 weist einen Nadelkörper 10 auf, der axial beweglich in der Ausnehmung 3 des Injektorkörpers 2 angeordnet ist . The fluid drain 9 is hydraulically coupled to a low pressure region, such as a fuel tank. The injection valve 1 has a needle body 10, which is arranged axially movable in the recess 3 of the injector body 2.
In einer Schließposition des Nadelkörpers 10 sitzt der Na- delkörper 10 auf einem zugehörigen Ventilsitz des Injektorkörpers 2 auf und unterbindet hierdurch einen Fluidfluss durch eine Einspritzöffnung 12 des Injektorkörpers 2. Das Ein¬ spritzventil 1 ist somit geschlossen. In einer Öffnungsposition des Nadelkörpers 10 ist der Nadelkörper 10 vorgegeben axial beabstandet von dem zugehörigen Ventilsitz und gibt hierdurch einen Fluidfluss durch die Einspritzöffnung 12 frei. Das Einspritzventil 1 ist somit geöffnet. Das Einspritzventil 1 weist einen Steuerraum 15 auf, der in der Ausnehmung 3 angeordnet ist und der hydraulisch zwischen dem Fluidzulauf 7 und dem Fluidablauf 9 angeordnet ist. Hierbei umfasst die Ausnehmung insbesondere den Raum um den Nadelkörper 10, eine hydraulische Verbindungsleitung zum Steuerraum 15 sowie den Steuerraum 15 selbst. In a closing position of the needle body 10 of the Na sitting delkörper 10 on an associated valve seat of the injector body 2 and thereby inhibits fluid flow through an injection port 12 of the injector body 2. A ¬ injection valve 1 is thus closed. In an opening position of the needle body 10, the needle body 10 is predetermined axially spaced from the associated valve seat and thereby releases a fluid flow through the injection port 12. The injection valve 1 is thus opened. The injection valve 1 has a control chamber 15, which is arranged in the recess 3 and which is arranged hydraulically between the fluid inlet 7 and the fluid outlet 9. In this case, the recess in particular comprises the space around the needle body 10, a hydraulic connecting line to the control chamber 15 and the control chamber 15 itself.
Das Einspritzventil 1 weist ein Steuerventil 16 mit einem Ventilkörper 17 auf. Das Steuerventil 16 ist in dem Steuerraum 15 angeordnet. In einer Schließposition des Ventilkörpers 17 sitzt der Ventilkörper 17 auf einem zugehörigen Ventilsitz des Injektorkörpers 2 auf, wodurch ein Fluidfluss zwischen dem Steuerraum 15 und dem Fluidablauf 9 unterbunden ist. The injection valve 1 has a control valve 16 with a valve body 17. The control valve 16 is arranged in the control chamber 15. In a closed position of the valve body 17, the valve body 17 rests on an associated valve seat of the injector body 2, whereby a fluid flow between the control chamber 15 and the fluid outlet 9 is prevented.
In einer Öffnungsposition des Ventilkörpers 17 ist der Ventilkörper 17 vorgegeben axial beabstandet von dem zugehörigen Ventilsitz und gibt somit den Fluidfluss zwischen dem Steuerraum 15 und dem Fluidablauf 9 frei. In an opening position of the valve body 17, the valve body 17 is predetermined axially spaced from the associated valve seat and thus releases the fluid flow between the control chamber 15 and the fluid outlet 9.
Das Einspritzventil 1 weist einen Piezoaktuator 20 auf, der mit dem Steuerventil 16 über einen ersten Übertrager 23 gekoppelt ist zum Öffnen des Steuerventils 16. Der Piezoaktuator 20 ist zusätzlich mechanisch mit dem Nadelkörper 10 mechanisch koppelbar, beispielsweise nach Überwinden eines vorgegebenen Leerhubs L, beispielsweise über einen zweiten Übertrager 24, der mit dem Nadelkörper 10 verbunden ist. Das Einspritzventil 1 kann in verschiedenen Betriebsmodi be¬ trieben werden. Figur 7 zeigt drei Betriebsmodi. Ein erster Betriebsmodus ist eine so genannte füll stroke injektion FSI. Hier wird das Einspritzventil 1 eine vorgegebene Zeit geöffnet und anschließend wieder geschlossen. Ein weiterer Betriebsmodus ist eine so genannte part stroke injektion PSI. Hier wird das Einspritzventil 1 nur kurz geöffnet und sofort wieder ge¬ schlossen. Ein weiterer Betriebsmodus ist eine so genannte boost injektion BI . Hier wird das Einspritzventil 1 zuerst etwas geöffnet, nach einer vorgegebenen Zeitdauer noch weiter geöffnet und nach einer weiteren vorgegebenen Zeitdauer wieder geschlossen. Die Betriebsmodi werden durch vier Zeitpunkte re¬ präsentiert: Ein Zeitpunkt OPP1, in dem der Öffnungsvorgang des Einspritzventils 1 beginnt; Ein oder mehrere Zeitpunkte OPP2, in dem der Nadelkörper 10 die vorgegebene Öffnungsposition er- reicht; Ein Zeitpunkt OPP3, in dem der Schließvorgang des Einspritzventils 1 beginnt; Ein Zeitpunkt OPP4, in dem der Nadelkörper 10 die Schließposition erreicht. Figur 8 zeigt ein Ablaufdiagramm eines Programms zum Betreiben des Einspritzventils 1. Das Programm kann beispielsweise von einer Steuervorrichtung SV abgearbeitet werden. The injection valve 1 has a piezoactuator 20, which is coupled to the control valve 16 via a first transformer 23 for opening the control valve 16. The piezoelectric actuator 20 is mechanically coupled to the needle body 10 mechanically, for example, after overcoming a predetermined idle stroke L, for example a second transmitter 24 connected to the needle body 10. The injection valve 1 can be ¬ driven in various operating modes. Figure 7 shows three modes of operation. A first operating mode is a so-called filling stroke injection FSI. Here, the injection valve 1 is opened for a predetermined time and then closed again. Another operating mode is a so-called part stroke injection PSI. Here, the injection valve 1 is opened only briefly and immediately ge ¬ closed. Another mode of operation is a so-called boost injection BI. Here, the injection valve 1 is first opened a bit, after a predetermined period of time even further opened and closed again after a further predetermined period of time. The operating modes are re ¬ presented by four times: A time OPP1, in which the opening process of the injection valve 1 starts; One or more points in time OPP2 in which the needle body 10 reaches the predetermined opening position enough; A time OPP3 in which the closing operation of the injector 1 starts; A time OPP4 in which the needle body 10 reaches the closing position. FIG. 8 shows a flow diagram of a program for operating the injection valve 1. The program can be executed, for example, by a control device SV.
Das Programm wird in einem Schritt Sl gestartet. In dem Schritt Sl befindet sich der Piezoaktuator 20 in einem geladenen Zustand (siehe Figur 1) . Die Ausnehmung 3 ist in dem Schritt 1 durch den Fluidzulauf 7 mit Kraftstoff unter hohem Druck gefüllt. Durch ein Kräfteverhältnis, das auf den Ventilkörper 17 des Steuerventils 16 wirkt, befindet sich der Ventilkörper 17 des Steuerventils 16 in der Schließposition. Weiterhin befindet sich durch ein weiteres Kräfteverhältnis der Nadelkörper 10 in der Schlie߬ position. The program is started in a step S1. In step S1, the piezoactuator 20 is in a charged state (see FIG. 1). The recess 3 is filled in step 1 by the fluid inlet 7 with fuel at high pressure. By a balance of forces acting on the valve body 17 of the control valve 16, the valve body 17 of the control valve 16 is in the closed position. Furthermore, there is a further balance of forces of the needle body 10 in the closed ¬ position.
In einem Schritt S3 wird der Piezoaktuator 20 elektrisch entladen. Der Beginn des Schritts S3 repräsentiert den Zeitpunkt OPP1, in dem der Öffnungsvorgang des Einspritzventils 1 beginnt. In a step S3, the piezoactuator 20 is electrically discharged. The beginning of step S3 represents the time OPP1 in which the opening operation of the injection valve 1 starts.
Durch das elektrische Entladen zieht sich der Piezoaktuator 20 zusammen. Hierdurch wird eine Kraft von dem Piezoaktuator 20 über den ersten Mitnehmer 23 auf den Ventilkörper 17 des Steuerventils 16 übertragen, so dass sich das Steuerventil 16 öffnet. Da auf der Seite des Fluidablaufs 9 ein niedrigerer Druck herrscht als in dem Steuerraum 15, strömt Fluid von dem Steuerraum 15 in den Fluidablauf 9. Hierdurch kommt es zu einem Druckgefälle in der Ausnehmung 3. Durch dieses Druckgefälle wirkt eine Kraft auf den Nadelkörper 10, so dass dieser sich von seinem zugehörigen Ventilsitz hebt und somit die Einspritzöffnung 12 frei gibt (siehe Figur 2, Figur 3) . 0 By the electric discharge, the piezoelectric actuator 20 contracts. As a result, a force is transmitted from the piezoactuator 20 via the first driver 23 to the valve body 17 of the control valve 16, so that the control valve 16 opens. Since a lower pressure prevails on the side of the fluid outlet 9 than in the control chamber 15, fluid flows from the control chamber 15 into the fluid outlet 9. This results in a pressure gradient in the recess 3. A pressure force acts on the needle body 10. so that it lifts from its associated valve seat and thus the injection port 12 is free (see Figure 2, Figure 3). 0
o  O
In einem Schritt S5 wird ein Zeitpunkt eines ersten mechanischen Prellens mittels des Piezoaktuators 20 detektiert. Das erste mechanische Prellen entsteht dadurch, dass der zweite Übertrager 24 durch die axiale Bewegung des Nadelkörpers 10 den Leerhub L überwindet und an den Piezoaktuator 20 anstößt. Hierbei erreicht der Nadelkörper 10 die vorgegebene Öffnungsposition (Figur 3) . Der Zeitpunkt der Detektion des ersten mechanischen Prellens repräsentiert somit den Zeitpunkt OPP2, in dem der Nadelkörper 10 die vorgegebene Öffnungsposition erreicht. In a step S5, a time of a first mechanical bounce is detected by means of the piezoactuator 20. The first mechanical bouncing arises from the fact that the second transmitter 24 overcomes the idle stroke L due to the axial movement of the needle body 10 and abuts against the piezoactuator 20. Here, the needle body 10 reaches the predetermined opening position (Figure 3). The time of detection of the first mechanical bounce thus represents the time OPP2, in which the needle body 10 reaches the predetermined opening position.
Wird das Einspritzventil 1 in dem Betriebsmodus füll stroke injection FSI betrieben, so wird das Programm nach einer vorgegebenen Zeitdauer in einem Schritt S7 fortgeführt. Wird das Einspritzventil 1 in dem Betriebsmodus part stroke injection PSI betrieben, so wird sofort nach der Detektion des ersten mechanischen Prellens das Programm in dem Schritt S7 fortgeführt . Wird das Einspritzventil 1 in dem Betriebsmodus boot injection BI betrieben, so wird das Programm nach einer vorgegebenen Zeitdauer in dem Schritt S3 fortgeführt und nach dem erneuten Erreichen des Schrittes S5 nach einer weiteren vorgegebenen Zeitdauer in dem Schritt S7 fortgeführt. If the injection valve 1 is operated in the operating mode filling stroke injection FSI, then the program is continued after a predetermined period of time in a step S7. If the injection valve 1 is operated in the operating mode partial stroke injection PSI, the program is continued in step S7 immediately after the detection of the first mechanical bounce. If the injection valve 1 is operated in the operating mode boot injection BI, then the program is continued after a predetermined period of time in the step S3 and continued after the renewed reaching of the step S5 after a further predetermined period of time in the step S7.
In dem Schritt S7 wird abhängig von dem detektierten Zeitpunkt des ersten mechanischen Prellens der Piezoaktuator 20 elektrisch geladen, beispielsweise in einem Folgearbeitszyklus des Ein- spritzventils 1 oder in demselben Arbeitszyklus des Ein- spritzventils 1, in dem das erste mechanische Prellen detektiert wurde. Der Beginn des Schritts repräsentiert den Zeitpunkt OPP3, in dem der Schließvorgang des Einspritzventils 1 beginnt. Durch das elektrische Laden des Piezoaktuators 20 dehnt sich dieser aus und drückt somit mittels der mechanischen Kopplung mit dem Nadelkörper 10 oder mit dem zweiten Übertrager 24 den Nadelkörper 10 in seine Schließposition, wodurch der Fluidfluss durch die Einspritzöffnung 12 wieder unterbunden wird (Siehe Figur 4, Figur 5) . In step S7, depending on the detected time of the first mechanical bounce, the piezoactuator 20 is electrically charged, for example in a subsequent work cycle of the injection valve 1 or in the same work cycle of the injection valve 1 in which the first mechanical bounce was detected. The beginning of the step represents the time OPP3 in which the closing operation of the injection valve 1 starts. As a result of the electrical charging of the piezoactuator 20, this expands and thus presses the needle body 10 into its closed position by means of the mechanical coupling with the needle body 10 or with the second transmitter 24, whereby the fluid flow through the injection opening 12 is again suppressed (see FIG. 4, FIG. FIG. 5).
Weiterhin wird durch das elektrische Laden des Piezoaktuators 20 die Kräftebilanz, die auf den Ventilkörper 17 des Steuerventils 16 verändert, so dass sich dieses wieder schließt (Figur 6) . Furthermore, as a result of the electrical charging of the piezoactuator 20, the balance of forces which changes to the valve body 17 of the control valve 16, so that it closes again (Figure 6).
In einem Schritt S9 wird ein Zeitpunkt eines weiteren mecha¬ nischen Prellens mittels des Piezoaktuators 20 detektiert. Das weitere mechanische Prellen entsteht durch das Auftreffen des Nadelkörpers 10 auf dem zugehörigen Ventilsitz bei dem Erreichen der Schließposition des Nadelkörpers 10. Dieses weitere me¬ chanische Prellen wird über den Nadelkörper 10 und den zweiten Übertrager 24 auf den Piezoaktuator 20 übertragen. Der Zeitpunkt des weiteren mechanischen Prellens repräsentiert somit den Zeitpunkt OPP4, in dem der Nadelkörper 10 die Schließposition erreicht . In a step S9, a time of a further mechanical ¬ African bounce is detected by means of the piezo actuator 20th The further mechanical bouncing is caused by the impact of the needle body 10 on the associated valve seat in reaching the closed position of the needle body 10. This further me ¬ chanical bouncing is transmitted via the needle body 10 and the second transformer 24 to the piezoelectric actuator 20. The time of the further mechanical bounce thus represents the time OPP4, in which the needle body 10 reaches the closed position.
Abhängig von dem Zeitpunkt des weiteren mechanischen Prellens und/oder dem Zeitpunkt des ersten mechanischen Prellens wird gegebenenfalls nach einer vorgegebenen Zeitdauer das Programm in dem Schritt S3 fortgesetzt und ein weiterer Arbeitszyklus beginnt . Depending on the time of the further mechanical bounce and / or the time of the first mechanical bounce, the program is optionally continued after a predetermined period of time in step S3 and another cycle begins.
Da der Zeitpunkt des ersten mechanischen Prellens den Zeitpunkt OPP2 des Erreichens der vorgegebenen Öffnungsposition repräsentiert und da der Zeitpunkt des weiteren mechanischen Prellens den Zeitpunkt OPP4 des Erreichens der Schließposition reprä¬ sentiert, kann das Einspritzventil 1 mittels dieser Zeitpunkte in den Betriebsmodi füll stroke injection FSI, part stroke injection PSI und der boot injection BI geregelt werden. Hiermit kann insbesondere für diese Betriebsmodi eine sehr hohe Ein- spritzgenauigkeit erreicht werden. Since the timing of the first mechanical bounce represents the time OPP2 the reaching of the predetermined opening position, and since the time of further mechanical bounce the time OPP4 of reaching the closed position repre ¬ sented, the injection valve 1 can fill in the operation modes by means of these time points stroke injection FSI, part stroke injection PSI and the boot injection BI are regulated. In this way, a very high injection accuracy can be achieved, in particular for these operating modes.

Claims

Patentansprüche claims
1. Einspritzventil (1) aufweisend 1. injection valve (1) having
- einen Injektorkörper (2) mit einer Ausnehmung (3) und einem Fluidzulauf (7) und einem Fluidablauf (9),  - An injector body (2) having a recess (3) and a fluid inlet (7) and a fluid outlet (9),
- einen Nadelkörper (10), der axial beweglich in der Ausnehmung (3) des Injektorkörpers (2) angeordnet ist und der in einer Schließposition des Nadelkörpers (10) einen Fluidfluss durch eine Einspritzöffnung (12) des Injek- torkörpers (2) unterbindet und ansonsten frei gibt, - A needle body (10) which is axially movable in the recess (3) of the injector body (2) and in a closed position of the needle body (10) prevents fluid flow through an injection port (12) of the injector torkörpers (2) and otherwise free,
- einen Steuerraum (15) der in der Ausnehmung (3) angeordnet ist und der hydraulisch zwischen dem Fluidzulauf (7) und dem Fluidablauf (9) angeordnet ist, - A control chamber (15) which is arranged in the recess (3) and which is arranged hydraulically between the fluid inlet (7) and the fluid outlet (9),
- ein Steuerventil (16) mit einem Ventilkörper (17), das in dem Steuerraum (15) angeordnet und das dazu ausgebildet ist , in einer Schließposition des Ventilkörpers (17) einen Fluidfluss zwischen dem Steuerraum (15) und dem Fluidablauf - A control valve (16) with a valve body (17) which is arranged in the control chamber (15) and which is adapted, in a closed position of the valve body (17), a fluid flow between the control chamber (15) and the fluid outlet
(9) zu unterbinden und ansonsten frei zu geben, (9) to prevent and otherwise release
- einen Piezoaktuator (20) der mechanisch mit dem Steu- erventil (16) über einen ersten Übertrager (23) gekoppelt ist zum Öffnen des Steuerventils (16), wobei der Pie¬ zoaktuator (20) zusätzlich mechanisch mit dem Nadelkörper- a piezoelectric actuator (20) mechanically erventil with the tax (16) via a first transformer (23) is coupled to the opening of the control valve (16), wherein the Pie ¬ zoaktuator (20) is additionally mechanically coupled to the needle body
(10) koppelbar ist zum Schließen des Einspritzventils (1) . (10) can be coupled to close the injection valve (1).
2. Einspritzventil (1) nach Anspruch 1, wobei der Piezoaktuator (20) mechanisch mit dem Nadelkörper (10) über einen zweiten Übertrager (24) koppelbar ist, der mit dem Nadelkörper (10) verbunden ist. 2. Injection valve (1) according to claim 1, wherein the piezoelectric actuator (20) is mechanically coupled to the needle body (10) via a second transformer (24) which is connected to the needle body (10).
3. Einspritzventil (1) nach Anspruch 2, wobei der Piezoaktuator (20) mechanisch mit dem Nadelkörper (10) gekoppelt ist, nach Überwinden eines vorgegebenen Leerhubs (L) zwischen dem zweiten Übertrager (24) und dem Piezoaktuator (20) . Einspritzventil (1) nach einem der vorhergehenden Ansprüche, bei dem der Piezoaktuator (20) mechanisch mit dem Nadelkörper (10) gekoppelt ist, bei Erreichen der 3. Injection valve (1) according to claim 2, wherein the piezoelectric actuator (20) is mechanically coupled to the needle body (10), after overcoming a predetermined idle stroke (L) between the second transmitter (24) and the piezoelectric actuator (20). Injection valve (1) according to one of the preceding claims, in which the piezoactuator (20) is mechanically coupled to the needle body (10) upon reaching the
Schließposition des Nadelkörpers (10) und bei Erreichen einer vorgegebenen Öffnungsposition des Nadelkörpers (10) .  Closed position of the needle body (10) and upon reaching a predetermined opening position of the needle body (10).
Verfahren zum Betreiben des Einspritzventils (1) nach einem der Ansprüche 1 bis 4, bei dem Method for operating the injection valve (1) according to one of Claims 1 to 4, in which
- der Piezoaktuator (20) elektrisch entladen wird zum Öffnen des Steuerventils (16) mittels des ersten Übertragers (23) und hierdurch zum Öffnen des Einspritzventils (1),  - The piezoelectric actuator (20) is electrically discharged to open the control valve (16) by means of the first transformer (23) and thereby to open the injection valve (1),
- ein Zeitpunkt eines ersten mechanischen Prellens mittels des Piezoaktuators (20) detektiert wird, das durch die mechanische Kopplung des Piezoaktuators (20) mit dem Nadelkörper (10) bei Erreichen einer vorgegebenen Öffnungsposition des Nadelkörpers (10) auf den Piezoaktuator (20) übertragen wird,  - A time of a first mechanical bounce is detected by means of the piezoelectric actuator (20), which is transmitted to the piezoelectric actuator (20) by the mechanical coupling of the piezo actuator (20) with the needle body (10) upon reaching a predetermined opening position of the needle body (10) .
- abhängig von dem detektierten Zeitpunkt des ersten mechanischen Prellens der Piezoaktuator (20) elektrisch geladen wird zum Schließen des Einspritzventils (1) mittels der mechanischen Kopplung des Piezoaktuators (20) mit dem Nadelkörper (10) .  - Is electrically charged depending on the detected time of the first mechanical bounce of the piezoelectric actuator (20) for closing the injection valve (1) by means of the mechanical coupling of the piezoactuator (20) with the needle body (10).
Verfahren nach Anspruch 5, bei dem ein Zeitpunkt eines weiteren mechanischen Prellens mittels des Piezoaktuators (20) detektiert wird, das durch die mechanische Kopplung des Piezoaktuators (20) mit dem Nadelkörper (10) bei Erreichen der Schließposition des Nadelkörpers (10) auf den Pie¬ zoaktuator (20) übertragen wird. Method according to Claim 5, in which a time of a further mechanical bounce is detected by means of the piezoactuator (20) which, as a result of the mechanical coupling of the piezoactuator (20) to the needle body (10) when the closing position of the needle body (10) is reached on the pie ¬ zoaktuator (20) is transmitted.
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DE102011075750B4 (en) 2011-05-12 2021-02-11 Vitesco Technologies GmbH Method for determining a position of a closure element of an injection valve for an internal combustion engine
DE102013220528B4 (en) 2013-10-11 2015-05-07 Continental Automotive Gmbh Injection valve and method for operating an injection valve

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DE102013220528B4 (en) 2015-05-07
US10400698B2 (en) 2019-09-03
CN105593507B (en) 2018-08-07
CN105593507A (en) 2016-05-18
WO2015052332A1 (en) 2015-04-16
US20160252034A1 (en) 2016-09-01
EP3055550B1 (en) 2018-02-28
DE102013220528A1 (en) 2015-04-16

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