EP0204068B1 - Electrically actuated fuel injection valve for internal-combustion engines - Google Patents

Electrically actuated fuel injection valve for internal-combustion engines Download PDF

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Publication number
EP0204068B1
EP0204068B1 EP86102630A EP86102630A EP0204068B1 EP 0204068 B1 EP0204068 B1 EP 0204068B1 EP 86102630 A EP86102630 A EP 86102630A EP 86102630 A EP86102630 A EP 86102630A EP 0204068 B1 EP0204068 B1 EP 0204068B1
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EP
European Patent Office
Prior art keywords
block
fuel
oscillator
chamber
injection valve
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Expired
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EP86102630A
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German (de)
French (fr)
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EP0204068A1 (en
Inventor
Jürgen Dr. Lange
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Mannesmann VDO AG
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Mannesmann VDO AG
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Priority to AT86102630T priority Critical patent/ATE35168T1/en
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    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • 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

Definitions

  • the invention relates to an electrically actuated fuel injection valve according to the preamble of claim 1.
  • a fuel injection valve is also described in EP-A-0 204 070 and EP-A-0 203 274 having the same priority date.
  • the piezoelectric vibrator is mounted in a block from which the fuel supply path is formed.
  • the piezoelectric oscillator is designed as a hollow cylindrical radial oscillator, in the wall of which a number of fuel-receiving chambers are accommodated parallel and concentrically to its longitudinal axis. One end of the radial oscillator with the continuous chambers protrudes into an annular constant volume chamber which is formed from the block concentrically to the longitudinal axis.
  • the fuel injector works on the principle that the piezoelectric vibrator determines the preferred direction of movement after applying an electrical voltage to its electrodes and accordingly forming an electric field between the electrodes of the vibrator and accordingly changing the thickness without an element that is movable in its entirety, in particular without a displaceable valve needle , in which the fuel is injected into the vicinity of the fuel injection valve.
  • the fuel injection valve measures the required injection quantity and creates a prerequisite for the atomization of the fuel.
  • a high voltage is required to operate the piezoelectric vibrator, and this voltage must be supplied to the electrodes of the vibrator.
  • This controlled high voltage can cause faults in other electrical systems, in particular also radio systems, which are located in the vicinity of the high-voltage generator and the high-voltage feed lines to the fuel injector with the oscillator.
  • a fuel injector corresponding to the preamble is known from US-A-33 91 680.
  • leads are led to the electrodes of the cylindrical radial oscillator from a high-voltage generator arranged outside the valve. This training can lead to faults in other electrical systems.
  • a piezoelectric oscillator and an electronic control of the oscillator are arranged within a housing arranged in the atomizer.
  • the present invention has for its object to develop the fuel injection valve of the type mentioned so that interference caused by high operating voltages of the vibrator can be avoided.
  • the block which is made of metal and therefore shields electrical fields well, is used here at the same time for accommodating a high-voltage generator circuit arrangement.
  • the block with this high-voltage generator circuit arrangement must therefore only be supplied with a low supply voltage which does not cause any faults.
  • the housing of the high-voltage generator circuit arrangement in the block to which a ground connection can easily be made to the surrounding metal parts, avoids the risk of persons coming into contact with parts carrying high voltage.
  • the fuel injector with the block is designed such that the high voltage generator circuit arrangement is arranged in a cavity which is separate from the fuel-carrying parts. This cavity is also referred to below as a shielding chamber.
  • a low-voltage connector is expediently attached to the block and is connected in the block to the high-voltage generator circuit arrangement. This allows the block with the piezoelectric vibrator to be easily assembled and connected to the supply voltage source. Testing and, if necessary, replacement of the block with the high-voltage generator circuit arrangement are also facilitated.
  • a diode-capacitor cascade circuit is preferably used as the high-voltage generator circuit arrangement, which has a compact design and can therefore be accommodated in the block without problems.
  • the fuel injection valve in Fig. 1 is shown enlarged.
  • An essential part of the fuel injection valve according to FIG. 1 is a hollow cylindrical radial oscillator 11 made of piezoelectric material.
  • a row of fuel-receiving chambers 12, 12 ' is arranged in the hollow cylindrical radial oscillator between its inner wall and the outer wall.
  • the fuel-absorbing chambers are located in a neutral fiber of the radial oscillator and are designed as continuous bores with a constant diameter that are open at the top and bottom. They run parallel and concentric to the longitudinal axis 19.
  • the inner wall and the outer wall of the radial oscillator are each covered with an electrode, which is only indicated by the supply line 14 or 15.
  • the lower side of the fuel-receiving chambers 12, 12 ' is opposed by an annular diaphragm 16 which has holes 17, 17' which are aligned with the chambers and determine the droplet size.
  • the radial oscillator and the ring diaphragm are mounted in a block 18 so that the ring diaphragm 16 with the bores 17, 17 'or the chambers of the radial oscillator 11 can inject fuel downwards.
  • the fuel supply path to the ring oscillator is arranged in the upper part of the largely rotationally symmetrical about the longitudinal axis 19.
  • the fuel feed path essentially consists of an annular constant volume chamber 20, into which a fuel inlet connection 21 and a fuel outlet connection 22 open.
  • the free cross sections of the connecting pieces 21 and 22 are small compared to the surface of the inner wall of the constant volume chamber.
  • the radial oscillator 11 is inserted in an annular recess 23 of the block 18 with seals 24-26 sealed.
  • the block 18 and the cover 28 are penetrated by a central through bore 29 which is provided for guiding supply air in the main flow direction according to arrow 34.
  • the high voltage required to operate the piezoelectric radial oscillator is generated in a high voltage generator 35, which is housed in a shielding chamber 36 at the upper end of the block 18.
  • the shielding chamber is closed to the through hole 29 by the wall 30, to the outside essentially by a wall 37.
  • the shielding chamber is closed by the cover 28 towards the top.
  • a connector 38 is used to supply a supply voltage, which is an alternating voltage of relatively low amplitude, which is indicated in the drawing only in a very simplified manner.
  • the high voltage generated in the high voltage generator 35 from the low alternating voltage is conducted to the electrodes of the radial oscillator via the lines 14, 15, which are advantageously shielded in bores 39, 40 in the wall of the block.
  • the high-voltage generator and the high-voltage supply lines 14, 15 are thus arranged in the block so that practically no interfering fields can escape from the block.
  • the volume of the chambers 12, 12 'in the ring oscillator changes.
  • the fuel flowing into these fuel receiving chambers from the constant volume chamber 20 is essentially injected downwards through the bores 17, 17 'of the ring diaphragm 16 into the volume surrounding the fuel injection valve.
  • the preferred direction of movement 27 of the fuel thus runs as indicated by the arrow marked accordingly.
  • the fuel-absorbing chambers 12, 12 'can therefore be designed as a through hole for ease of production.
  • the internal supply air which is passed through the through hole 29, causes an expansion of the atomized fuel, which in the preferred direction of movement 27 from the holes 17, 17 'into the volume, for. B. is injected into a central injection system.
  • the high-voltage generator 35 is simultaneously cooled by the supply air.
  • a high-voltage generator circuit arrangement is shown in simplified form in FIG. 2. It comprises a cascade circuit consisting of capacitors 41, 42, 43, 44 and diodes 45, 46, 47, 48 in a less complex manner. Connections 49, 50, which correspond to plug connector 38, are used to connect the AC supply voltage with a relatively low amplitude.
  • a z. B. quadrupled, rectified voltage is supplied via the leads 14, 15 to the piezoelectric radial oscillator 11.
  • the cascade can be expanded practically as required to achieve an even higher voltage multiplication.

Abstract

In an electrically actuatable fuel-injection valve for internal combustion engines, a piezoelectric oscillator (radial oscillator 11) which is provided with electrodes has at least one fuel-receiving chamber (12). The chamber (12) is in communication with the fuel feed path (constant-volume chamber 20) and an ejection opening (bore 17). The oscillator (11) is mounted in a block (18) out of which the fuel feed path (constant-volume chamber 20) is also formed. Furthermore, a high-voltage generator (35) is located, electrically shielded from the outside, within the block (18), which consists of metal. The high-voltage generator is connected to the electrodes of the piezoelectric oscillator (11) via feed lines (14, 15) which are conducted within the block (18).

Description

Die Erfingung betrifft ein elektrisch betätigbares Kraftstoffeinspritzventil nach dem Oberbegriff des Anspruchs 1. Ein derartiges Kraftstoffeinspritzventil ist auch in der EP-A-0 204 070 und der EP-A-0 203 274 gleichen Prioritätsdatums beschrieben.The invention relates to an electrically actuated fuel injection valve according to the preamble of claim 1. Such a fuel injection valve is also described in EP-A-0 204 070 and EP-A-0 203 274 having the same priority date.

Dieses elektrisch betätigbare Kraftstoffeinspritzventil für Brennkraftmaschinen zeichnet sich dadurch aus, daß es einen mit Elektroden versehenen piezoelektrischen Schwinger mit mindestens einer Kraftstoff aufnehmenden Kammer aufweist, daß mit der Kammer ein Kraftstoffzuleitungsweg und eine Ausspritzöffnung (= Austrittsöffnung) in Kraftstoff leitender Verbindung stehen, die derart gestaltet sind, daß beim Anlegen einer Spannung an die Elektroden dem Kraftstoff eine Vorzugsbewegung durch die Kammer zu der Ausspritzöffnung erteilt wird. Insbesondere ist der piezoelektrische Schwinger in einem Block montiert, aus dem der Kraftstoffzuleitungsweg ausgeformt ist. Der piezoelektrische Schwinger ist als hohlzylindrischer Radialschwinger ausgebildet, in dessen Wand eine Reihe von Kraftstoff aufnehmenden Kammern parallel und konzentrisch zu dessen Längsachse untergebracht sind. Ein Ende des Radialschwingers mit den durchgehenden Kammern ragt in eine ringförmige Konstantvolumen-Kammer herein, die aus dem Block konzentrisch zu der Längsachse ausgeformt ist.This electrically actuated fuel injection valve for internal combustion engines is characterized in that it has an electrode-provided piezoelectric oscillator with at least one fuel-receiving chamber, that a fuel supply path and an ejection opening (= outlet opening) are in a fuel-conducting connection with the chamber, which are designed in this way that when a voltage is applied to the electrodes, the fuel is given a preferential movement through the chamber to the ejection opening. In particular, the piezoelectric vibrator is mounted in a block from which the fuel supply path is formed. The piezoelectric oscillator is designed as a hollow cylindrical radial oscillator, in the wall of which a number of fuel-receiving chambers are accommodated parallel and concentrically to its longitudinal axis. One end of the radial oscillator with the continuous chambers protrudes into an annular constant volume chamber which is formed from the block concentrically to the longitudinal axis.

Das Kraftstoffeinspritzventil arbeitet nach dem Prinzip, daß der piezoelektrische Schwinger nach Anlegen einer elektrischen Spannung an seine Elektroden und dementsprechender Bildung eines elektrischen Feldes zwischen den Elektroden des Schwingers und.dementsprechender Dickenänderung ohne ein in seiner Gesamtheit bewegliches Element, insbesondere ohne verschiebbare Ventilnadel, die Vorzugsbewegungsrichtung bestimmt, in der der Brennkraftstoff in die Umgebung des Kraftstoffeinspritzventils eingespritzt wird. In diesem Zusammenhang mißt das Kraftstoffeinspritzventil die benötigte Einspritzmenge zu und schafft eine Voraussetzung für die Zerstäubung des Brennkraftstoffs. Dies wird dadurch erreicht, daß durch das elektrische Feld beim Anlegen der Hochspannung an die Elektroden des piezoelektrischen Schwingers sich dieser zusammenzieht oder ausdehnt, damit das Volumen der Kraftstoff aufnehmenden Kammer verändert, und daß bei einer Volumenverringerung der Kammer der Brennkraftstoff im wesentlichen aus der Ausspritzöffnung austritt, während der Kraftstoffrückfluß durch den Kraftstoffzuleitungsweg wesentlich gedrosselt ist.The fuel injector works on the principle that the piezoelectric vibrator determines the preferred direction of movement after applying an electrical voltage to its electrodes and accordingly forming an electric field between the electrodes of the vibrator and accordingly changing the thickness without an element that is movable in its entirety, in particular without a displaceable valve needle , in which the fuel is injected into the vicinity of the fuel injection valve. In this connection, the fuel injection valve measures the required injection quantity and creates a prerequisite for the atomization of the fuel. This is achieved in that the electric field when the high voltage is applied to the electrodes of the piezoelectric oscillator contracts or expands so that the volume of the fuel-receiving chamber changes, and that when the chamber is reduced in volume the fuel essentially emerges from the ejection opening , while the fuel return flow through the fuel supply path is significantly throttled.

Zu dem Betrieb des piezoelektrischen Schwingers ist eine hohe Spannung erforderlich, die den Elektroden des Schwingers zuzuführen ist. Diese gesteuerte hohe Spannung kann Störungen in anderen elektrischen Anlagen, insbesondere auch Funkanlagen, verursachen, die sich in der Nähe des Hochspannungserzeugers und der Hochspannungszuleitungen zu dem Kraftstoffeinspritzventil mit dem Schwinger befinden.A high voltage is required to operate the piezoelectric vibrator, and this voltage must be supplied to the electrodes of the vibrator. This controlled high voltage can cause faults in other electrical systems, in particular also radio systems, which are located in the vicinity of the high-voltage generator and the high-voltage feed lines to the fuel injector with the oscillator.

Ein dem Oberbegriff entsprechendes Kraftstoffeinspritzventil ist aus der US-A-33 91 680 bekannt. Dabei sind zu den Elektroden des zylindrischen Radialschwingers von einem außerhalb des Ventils angeordneten Hochspannungserzeuger Zuleitungen geführt. Diese Ausbildung kann zu Störungen in anderen elektrischen Anlagen führen.A fuel injector corresponding to the preamble is known from US-A-33 91 680. In this case, leads are led to the electrodes of the cylindrical radial oscillator from a high-voltage generator arranged outside the valve. This training can lead to faults in other electrical systems.

Bei einem aus der FR-A-22 85 930 bekannten Flüssigkeitszerstäuber sind innerhalb eines im Zerstäuber angeordneten Gehäuses ein piezoelektrischer Schwinger sowie eine elektronische Steuerung des Schwingers angeordnet.In the case of a liquid atomizer known from FR-A-22 85 930, a piezoelectric oscillator and an electronic control of the oscillator are arranged within a housing arranged in the atomizer.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, das Kraftstoffeinspritzventil der eingangs genannten Gattung so weiterzubilden, daß durch hohe Betriebsspannungen des Schwingers verursachte Störungen vermieden werden.The present invention has for its object to develop the fuel injection valve of the type mentioned so that interference caused by high operating voltages of the vibrator can be avoided.

Diese Aufgabe wird durch die in dem kennzeichnenden Teil des Anspruchs 1 angegebene Ausbildung des Blocks, in dem der Schwinger angeordnet ist, gelöst. Der aus Metall bestehende und somit elektrische Felder gut abschirmende Block wird hier gleichzeitig zur Unterbringung einer Hochspannungserzeuger-Schaltungsanordnung verwendet. Dem Block mit dieser Hochspannungserzeuger-Schaltungsanordnung ist daher nur eine niedrige Versorgungsspannung zuzuführen, die keine Störungen hervorruft. Außerdem wird durch die Unterbringung der Hochspannungserzeuger-Schaltunganordnung in dem Block, zu dem leicht eine Masseverbindung mit den umgebenden Metallteilen hergestellt werden kann, die Gefahr einer Berührung von Personen mit Hochspannung führenden Teilen vermieden. Das Kraftstoffeinspritzventil mit dem Block ist so gestaltet, daß die Hochspannungserzeuger-Schaltungsanordnung in einem Hohlraum angeordnet ist, der von den Kraftstoff führenden Teilen getrennt ist. Dieser Hohlraum wird im folgenden auch als Abschirmkammer bezeichnet.This object is achieved by the design of the block in which the oscillator is arranged, as specified in the characterizing part of claim 1. The block, which is made of metal and therefore shields electrical fields well, is used here at the same time for accommodating a high-voltage generator circuit arrangement. The block with this high-voltage generator circuit arrangement must therefore only be supplied with a low supply voltage which does not cause any faults. In addition, the housing of the high-voltage generator circuit arrangement in the block, to which a ground connection can easily be made to the surrounding metal parts, avoids the risk of persons coming into contact with parts carrying high voltage. The fuel injector with the block is designed such that the high voltage generator circuit arrangement is arranged in a cavity which is separate from the fuel-carrying parts. This cavity is also referred to below as a shielding chamber.

Zweckmäßig ist an dem Block ein Niederspannungs-Steckverbinder angebracht, der in dem Block mit der Hochspannungserzeuger-Schaltungsanordnung verbunden ist. Dadurch kann der Block mit dem piezoelektrischen Schwinger leicht montiert und an die Versorgungsspannungsquelle angeschlossen werden. Ebenso werden Prüfung und gegebenenfalls Austausch des Blocks mit der Hochspannungserzeuger-Schaltungsanordnung erleichtert.A low-voltage connector is expediently attached to the block and is connected in the block to the high-voltage generator circuit arrangement. This allows the block with the piezoelectric vibrator to be easily assembled and connected to the supply voltage source. Testing and, if necessary, replacement of the block with the high-voltage generator circuit arrangement are also facilitated.

Als Hochspannungserzeuger-Schaltungsanordnung dient bevorzugt eine DiodenKondensator Kaskadenschaltung, die kompakt ausgeführt und deswegen unproblematisch in dem Block untergebracht werden kann.A diode-capacitor cascade circuit is preferably used as the high-voltage generator circuit arrangement, which has a compact design and can therefore be accommodated in the block without problems.

Die Erfindung wird im folgenden anhand einer Zeichnung mit zwei Figuren erläutert. Es zeigen :

  • Fig. 1 einen Längsschnitt durch das Kraftstoffeinspritzventil mit integriertem Hochspannungserzeuger und
  • Fig. 2 eine schematisierte Hochspannungserzeuger-Schaltungsanordnung.
The invention is explained below with reference to a drawing with two figures. Show it :
  • Fig. 1 shows a longitudinal section through the fuel injector with integrated high voltage generator and
  • Fig. 2 is a schematic high voltage generator circuit arrangement.

Das Kraftstoffeinspritzventil in Fig. 1 ist vergrößert dargestellt.The fuel injection valve in Fig. 1 is shown enlarged.

Wesentlicher Teil des Kraftstoffeinspritzventils nach Fig. 1 ist ein hohlzylindrischer Radialschwinger 11 aus piezoelektrischem Material. In dem hohlzylindrischen Radialschwinger ist zwischen dessen Innenwand und der Außenwand eine Reihe von Kraftstoff aufnehmenden Kammern 12,12' angeordnet. Die Kraftstoff aufnehmenden Kammern liegen in einer neutralen Faser des Radialschwingers und sind als durchgehende, also oben und unten offene Bohrungen mit konstantem Durchmesser ausgebildet. Sie verlaufen parallel und konzentrisch zur Längsachse 19.An essential part of the fuel injection valve according to FIG. 1 is a hollow cylindrical radial oscillator 11 made of piezoelectric material. A row of fuel-receiving chambers 12, 12 'is arranged in the hollow cylindrical radial oscillator between its inner wall and the outer wall. The fuel-absorbing chambers are located in a neutral fiber of the radial oscillator and are designed as continuous bores with a constant diameter that are open at the top and bottom. They run parallel and concentric to the longitudinal axis 19.

Die Innenwand und die Außenwand des Radialschwingers ist jeweils mit einer Elektrode belegt, die lediglich durch die Zuleitung 14 bzw. 15 angedeutet ist.The inner wall and the outer wall of the radial oscillator are each covered with an electrode, which is only indicated by the supply line 14 or 15.

Der unteren Seite der Kraftstoff aufnehmenden Kammern 12,12' steht eine Ringblende 16 gegenüber, welche mit den Kammern fluchtende, die Tröpfchengröße bestimmende Bohrungen 17, 17' aufweist.The lower side of the fuel-receiving chambers 12, 12 'is opposed by an annular diaphragm 16 which has holes 17, 17' which are aligned with the chambers and determine the droplet size.

Der Radialschwinger und die Ringblende sind in einem Block 18 montiert, so daß die Ringblende 16 mit den Bohrungen 17, 17' bzw. die Kammern des Radialschwingers 11 nach unten Kraftstoff einspritzen können.The radial oscillator and the ring diaphragm are mounted in a block 18 so that the ring diaphragm 16 with the bores 17, 17 'or the chambers of the radial oscillator 11 can inject fuel downwards.

In dem oberen Teil des um die Längsachse 19 weitgehend rotationssymmetrischen. steifen Blocks, der ebenso wie ein Deckel 28 aus elektrisch abschirmenden Metall besteht, ist der Kraftstoffzuleitungsweg zu dem Ringschwinger angeordnet. Der Kraftstoffzuleitungsweg besteht im wesentlichen aus einer ringförmigen Konstantvolumen-Kammer 20, in die ein Kraftstoffzuflußstutzen 21 und ein Kraftstoffabflußstutzen 22 münden. Die freien Querschnitte der Stutzen 21 und 22 sind klein gegenüber der Fläche der Innenwand der Konstantvolumen-Kammer.In the upper part of the largely rotationally symmetrical about the longitudinal axis 19. rigid block, which, like a cover 28, is made of electrically shielding metal, the fuel supply path to the ring oscillator is arranged. The fuel feed path essentially consists of an annular constant volume chamber 20, into which a fuel inlet connection 21 and a fuel outlet connection 22 open. The free cross sections of the connecting pieces 21 and 22 are small compared to the surface of the inner wall of the constant volume chamber.

Der Radialschwinger 11 ist in einer ringförmigen Ausnehmung 23 des Blocks 18 mit Dichtungen 24-26 abgedichtet eingesetzt.The radial oscillator 11 is inserted in an annular recess 23 of the block 18 with seals 24-26 sealed.

Der Block 18 und der Deckel 28 sind durch eine zentrale Durchgangsbohrung 29 durchsetzt, die zur Führung von Zuluft in der Hauptströmungsrichtung gemäß Pfeil 34 vorgesehen ist. Die zum Betrieb des piezoelektrischen Radialschwingers erforderliche hohe Spannung wird in einem Hochspannungserzeuger 35 erzeugt, der in einer Abschirmkammer 36 an dem oberen Ende des Blocks 18 untergebracht ist. Die Abschirmkammer ist zu der Durchgangsbohrung 29 hin durch die Wand 30 geschlossen, nach außen im wesentlichen durch eine Wand 37. Nach oben hin ist die Abschirmkammer durch den Deckel 28 geschlossen. Zur Zuführung einer Versorgungsspannung, die eine Wechselspannung verhältnismäßig niedriger Amplitude ist, dient ein Steckverbinder 38, der in der Zeichnung nur stark vereinfacht angedeutet ist. Die in dem Hochspannungserzeuger 35 aus der niedrigen Wechselspannung erzeugte Hochspannung wird über die Leitungen 14, 15, die vorteilhaft abgeschirmt in Bohrungen 39, 40 in der Wand des Blocks geführt sind, an die Elektroden des Radialschwingers geleitet.The block 18 and the cover 28 are penetrated by a central through bore 29 which is provided for guiding supply air in the main flow direction according to arrow 34. The high voltage required to operate the piezoelectric radial oscillator is generated in a high voltage generator 35, which is housed in a shielding chamber 36 at the upper end of the block 18. The shielding chamber is closed to the through hole 29 by the wall 30, to the outside essentially by a wall 37. The shielding chamber is closed by the cover 28 towards the top. A connector 38 is used to supply a supply voltage, which is an alternating voltage of relatively low amplitude, which is indicated in the drawing only in a very simplified manner. The high voltage generated in the high voltage generator 35 from the low alternating voltage is conducted to the electrodes of the radial oscillator via the lines 14, 15, which are advantageously shielded in bores 39, 40 in the wall of the block.

Der Hochspannungserzeuger und die hohe Spannung führenden Zuleitungen 14, 15 sind damit so in dem Block angeordnet, daß praktisch keine störenden Felder aus dem Block nach außen dringen können.The high-voltage generator and the high-voltage supply lines 14, 15 are thus arranged in the block so that practically no interfering fields can escape from the block.

Bei Anlegen von Hochspannung an die Zuleitungen 14, 15 und das dementsprechend zwischen der Innenwand und der Außenwand des Radialschwingers gebildete elektrische Feld erfolgt eine Volumenänderung der Kammern 12,12' in dem Ringschwinger. Der in diese Kraftstoff aufnehmende Kammern von der Konstantvolumen-Kammer 20 einströmende Kraftstoff wird im wesentlichen nach unten durch die Bohrungen 17,17' der Ringblende 16 in das das Kraftstoffeinspritzventil umgebende Volumen eingespritzt. Die Vorzugsbewegungsrichtung 27 des Kraftstoffs verläuft somit wie mit dem entsprechend gekennzeichneten Pfeil angedeutet. Nach oben kann hingegen der Kraftstoff aus den Kammern 12, 12' nicht nennenswert in die Konstantvolumen-Kammer 20 zurückströmen, da diese mit einem großen Volumen im wesentlichen nicht kompressiblen Kraftstoffs gefüllt ist. Die den Kraftstoff aufnehmenden Kammern 12, 12' können daher fertigungsgünstig als durchgehende Bohrung ausgebildet sein.When high voltage is applied to the supply lines 14, 15 and the electrical field correspondingly formed between the inner wall and the outer wall of the radial oscillator, the volume of the chambers 12, 12 'in the ring oscillator changes. The fuel flowing into these fuel receiving chambers from the constant volume chamber 20 is essentially injected downwards through the bores 17, 17 'of the ring diaphragm 16 into the volume surrounding the fuel injection valve. The preferred direction of movement 27 of the fuel thus runs as indicated by the arrow marked accordingly. On the other hand, the fuel from the chambers 12, 12 'cannot flow upwards appreciably into the constant volume chamber 20, since this is filled with a large volume of essentially incompressible fuel. The fuel-absorbing chambers 12, 12 'can therefore be designed as a through hole for ease of production.

Durch die innere Zuluft, die durch die Durchgangsbohrung 29 geleitet wird, erfolgt eine Aufweitung des zerstäubten Kraftstoffes, der in der Vorzugsbewegungsrichtung 27 aus den Bohrungen 17,17' in das Volumen, z. B. einer Zentraleinspritzanlage eingespritzt wird. Durch die Zuluft wird gleichzeitig der Hochspannungserzeuger 35 gekühlt.The internal supply air, which is passed through the through hole 29, causes an expansion of the atomized fuel, which in the preferred direction of movement 27 from the holes 17, 17 'into the volume, for. B. is injected into a central injection system. The high-voltage generator 35 is simultaneously cooled by the supply air.

Eine Hochspannungserzeuger-Schaltungsanordnung ist vereinfacht in Fig. 2 dargestellt. Sie umfaßt in wenig aufwendiger Weise eine Kaskadenschaltung, bestehend aus Kondensatoren 41, 42, 43, 44 und Dioden 45, 46, 47, 48. Zum Anschluß der Versorgungswechselspannung mit relativ niedriger Amplitude dienen Anschlüsse 49, 50, die dem Steckerverbinder 38 entsprechen. Eine durch die Kaskade gebildete z. B. vervierfachte, gleichgerichtete Spannung wird über die Zuleitungen 14, 15 dem piezoelektrischen Radialschwinger 11 zugeführt. Die Kaskade kann praktisch beliebig erweitert werden, um eine noch höhere Spannungsvervielfachung zu erzielen.A high-voltage generator circuit arrangement is shown in simplified form in FIG. 2. It comprises a cascade circuit consisting of capacitors 41, 42, 43, 44 and diodes 45, 46, 47, 48 in a less complex manner. Connections 49, 50, which correspond to plug connector 38, are used to connect the AC supply voltage with a relatively low amplitude. A z. B. quadrupled, rectified voltage is supplied via the leads 14, 15 to the piezoelectric radial oscillator 11. The cascade can be expanded practically as required to achieve an even higher voltage multiplication.

Claims (3)

1. Electrically actuated fuel injection valve for internal combustion engines with a hollow cylindrical piezoelectric radial oscillator (11) equipped with electrodes which has chambers (12, 12') for receiving fuel which are connected to a fuel supply line path and to a jet opening, and with a block (18) in which the radial oscillator (11) is mounted and from which the fuel supply line path is formed, characterized in that the chambers (12, 12') for receiving fuel are formed continuously in the wall of the radial oscillator (11) parallel to its longitudinal axis (19) and concentric with the longitudinal axis (19) and one end of the radial oscillator (11) with the chambers (12, 12') projects into an annular constant-volume (20) chamber which is formed from the block (18) concentric with the longitudinal axis (19), in that a high voltage generator (35) is accommodated, in such way that it is screened externally, in a screened chamber (36) positioned in the block (18) which consists of metal and is connected with the electrodes of the piezoelectric oscillator (11) through leads (14, 15) which are run within the block, in that the screened chamber (36) is likewise formed in an annular shape and concentric to the longitudinal axis (19) of the block (18) separate from the constant volume chamber (20), and in that the annular screened chamber (36) is adjacent to a central continuous hole (29) which carries inlet air.
2. Electrically actuated fuel injection valve according to Claim 1, characterized in that a low voltage plug-in connector (38), which is connected within the block to the high voltage generator (35), is mounted on the block (18).
3. Electrically actuated fuel injection valve according to one of the preceding Claims, characterized by a diode capacitor cascade circuit configuration as the high voltage generator.
EP86102630A 1985-05-13 1986-02-28 Electrically actuated fuel injection valve for internal-combustion engines Expired EP0204068B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86102630T ATE35168T1 (en) 1985-05-13 1986-02-28 ELECTRICALLY OPERATED FUEL INJECTION VALVE FOR COMBUSTION ENGINES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3517258 1985-05-13
DE19853517258 DE3517258A1 (en) 1985-05-13 1985-05-13 ELECTRICALLY OPERABLE FUEL INJECTION VALVE FOR INTERNAL COMBUSTION ENGINES

Publications (2)

Publication Number Publication Date
EP0204068A1 EP0204068A1 (en) 1986-12-10
EP0204068B1 true EP0204068B1 (en) 1988-06-15

Family

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EP86102630A Expired EP0204068B1 (en) 1985-05-13 1986-02-28 Electrically actuated fuel injection valve for internal-combustion engines

Country Status (5)

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US (1) US4711396A (en)
EP (1) EP0204068B1 (en)
JP (1) JPS61261658A (en)
AT (1) ATE35168T1 (en)
DE (2) DE3517258A1 (en)

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DE19858676B4 (en) * 1998-12-18 2006-03-30 Webasto Ag Openable vehicle roof with adjustable sky section
JP5044368B2 (en) * 2007-11-06 2012-10-10 株式会社デンソー Fuel injection valve

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0203274A1 (en) * 1985-05-13 1986-12-03 VDO Adolf Schindling AG Electrically actuated fuel injection valve for internal-combustion engines
EP0204070A1 (en) * 1985-05-13 1986-12-10 VDO Adolf Schindling AG Electrically actuated fuel injection valve for internal-combustion engines

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3391680A (en) * 1965-09-01 1968-07-09 Physics Internat Company Fuel injector-ignitor system for internal combustion engines
DE2445791C2 (en) * 1974-09-25 1984-04-19 Siemens AG, 1000 Berlin und 8000 München Ultrasonic liquid atomizer
US4004733A (en) * 1975-07-09 1977-01-25 Research Corporation Electrostatic spray nozzle system
US4372491A (en) * 1979-02-26 1983-02-08 Fishgal Semyon I Fuel-feed system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0203274A1 (en) * 1985-05-13 1986-12-03 VDO Adolf Schindling AG Electrically actuated fuel injection valve for internal-combustion engines
EP0204070A1 (en) * 1985-05-13 1986-12-10 VDO Adolf Schindling AG Electrically actuated fuel injection valve for internal-combustion engines

Also Published As

Publication number Publication date
DE3517258A1 (en) 1987-01-15
US4711396A (en) 1987-12-08
DE3660317D1 (en) 1988-07-21
JPS61261658A (en) 1986-11-19
EP0204068A1 (en) 1986-12-10
ATE35168T1 (en) 1988-07-15

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