EP0278099A1 - Electromagnetic injection valve for compressed mixture engines - Google Patents

Electromagnetic injection valve for compressed mixture engines Download PDF

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Publication number
EP0278099A1
EP0278099A1 EP87118787A EP87118787A EP0278099A1 EP 0278099 A1 EP0278099 A1 EP 0278099A1 EP 87118787 A EP87118787 A EP 87118787A EP 87118787 A EP87118787 A EP 87118787A EP 0278099 A1 EP0278099 A1 EP 0278099A1
Authority
EP
European Patent Office
Prior art keywords
armature
sleeve
injection valve
coil
shaped pole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP87118787A
Other languages
German (de)
French (fr)
Inventor
Günter Härtel
Heinrich Hütten
Wolfgang Dr. Jordan
Ulrich Remde
Dieter Thönnessen
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.)
Pierburg GmbH
Original Assignee
Pierburg 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 Pierburg GmbH filed Critical Pierburg GmbH
Publication of EP0278099A1 publication Critical patent/EP0278099A1/en
Withdrawn legal-status Critical Current

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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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0614—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature
    • 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
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • 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
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/08—Injectors peculiar thereto with means directly operating the valve needle specially for low-pressure fuel-injection

Definitions

  • the invention relates to an electromagnetically clocked injection valve for mixture-compressing internal combustion engines according to the preamble of the patent claim.
  • the object of the invention is to provide an injection valve which can be clocked at high frequency in a large stroke range with small masses to be moved.
  • the injection valve 1 has an electrical connection 2, via which the electrical coil 3 is excited.
  • the coil 3 is arranged on a non-magnetic coil support 4 and is located in the valve housing 5.
  • the iron circuit of the magnet system is formed by an outer jacket 6 and two sleeve-shaped pole pieces 7.1, 7.2 located within the coil 3, so that the non-magnetic coil support between the coil and pole shoe comes to rest.
  • a non-magnetizable area 8 which can be designed as an intermediate ring, which results in the effect of an air gap, so that the field lines are excited between the pole pieces 7.1 and 7.2 in such a way that they form in the Area of the intermediate ring through the hole 9 of the pole pieces.
  • a magnetizable stop 10 is arranged so that the field lines that start from the pole shoe 7.2, also reach this part of the iron circuit of the magnet system. This has the effect that the sum of the forces acting on the armature 12 is composed of that of the plunger armature magnet system and that of the magnet system which is conventional per se with a central pole.
  • the resulting greater magnetic force - compared to one of the two types - results in a shorter tightening time and thus faster opening when the valve is closed and therefore with the largest air gap.
  • one of these components is provided on the surface opposite the other component with a non-magnetizable coating 10.1.
  • the valve structure described below is only to be understood as an example and does not affect the inventive magnetic circuit.
  • the stop 10 has a receptacle for a spring 11, which loads a cup-shaped armature 12 to which a needle 13 is attached, the other end of which carries a valve closing body 14.
  • the valve closing body 14 is designed as a ball and interacts with a conical valve seat 15 and controls a fuel outlet 16 which is arranged between a fuel inlet 17 and a fuel return 18.
  • the non-magnetizable area 8 and the armature end 19 projecting into this area are adjusted relative to one another such that the armature 12 covers the major part of the non-magnetizable area 8 when the coil 3 is not energized.
  • the dimension of this cover is determined when the valve dimensions are specified in order to obtain a favorable course of the tightening force in a further stroke range.
  • the armature covers it Non-magnetizable area, also in the stroke direction.
  • the term "covered” is intended to mean here that in the pulled-off state the armature 12 bears against the stop 10 in such a way that the armature projects beyond the non-magnetizable area 8 on both sides.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

An electromagnetic injection valve for internal combustion engines is described which, as a solenoid plunger system, is fitted with two sleeve-shaped pole shoes (7.1, 7.2) arranged coaxially inside the coil, which are held axially at a distance from one another by means of a non-magnetisable intermediate ring (8), and in addition has a magnetisable central pole within one of the sleeve-shaped pole shoes. The armature (12) connected to the valve closing body (14) acts against a spring (11) and is adjusted in the sleeve-shaped pole shoes (7.1, 7.2) in such a way that in the lifting direction it only partially covers the intermediate ring (8) in a non-excited state. <IMAGE>

Description

Die Erfindung betrifft ein elektromagnetisch getaktetes Einspritzventil für gemischverdichtende Brennkraftmaschinen nach dem Oberbegriff des Patentan­spruchs.The invention relates to an electromagnetically clocked injection valve for mixture-compressing internal combustion engines according to the preamble of the patent claim.

Ein derartiges Einspritzventil ist aus der DE-OS 34 39 671 bekannt. Diese An­ordnung ist hinsichtlich der Schaltfrequenz und der Schaltkraft verbesserungs­bedürftig.Such an injection valve is known from DE-OS 34 39 671. This arrangement is in need of improvement in terms of switching frequency and switching force.

Aufgabe der Erfindung ist es, ein Einspritzventil zu schaffen, das bei gerin­gen zu bewegenden Massen mit hoher Frequenz in einem großen Hubbereich getaktet werden kann.The object of the invention is to provide an injection valve which can be clocked at high frequency in a large stroke range with small masses to be moved.

Die Aufgabe wird bei einem Einspritzventil eingangs genannter Art durch die Merkmale des Patentanspruchs gelöst. Hierdurch wird erreicht, daß eine große Magnetkraft sowohl bei geschlossenem Ventil, d.h. bei dem größten Luftspalt, als auch bei kleineren Luftspalten auf den Anker wirkt. Dadurch wird die Anzugszeit verringert. Außerdem ist ein geringerer Strom für das sichere Offenhalten erforderlich, wodurch ein schneller Abbau des Magnetfeldes und ein schneller Schließvorgang erreicht wird.The object is achieved in an injection valve of the type mentioned by the features of the patent claim. This ensures that a large magnetic force both when the valve is closed, i.e. with the largest air gap, as well as with smaller air gaps acts on the anchor. This will reduce the tightening time. In addition, a lower current is required to keep it open, which means that the magnetic field is quickly broken down and closed.

Ein Ausführungsbeispiel ist in der Zeichnung schematisch dargestellt und wird im folgenden näher beschrieben. Das Einspritzventil 1 weist einen elektrischen Anschluß 2 auf, über den die elektrische Spule 3 erregt wird. Die Spule 3 ist auf einem nicht magnetischen Spulenträger 4 angeordnet und befindet sich im Ventilgehäuse 5. Der Eisenkreis des Magnetsystems wird von einem Außenmantel 6 und zwei innerhalb der Spule 3 befindlichen, hülsenförmigen Polschuhen 7.1, 7.2 gebildet, so daß der nicht magnetische Spulenträger zwischen Spule und Polschuh zu liegen kommt. Zwischen den im Abstand zueinander angeordneten Polschuhen befindet sich ein nicht magnetisierbarer Bereich 8, der als Zwischenring ausgebildet sein kann, wo­durch sich die Wirkung eines Luftspaltes ergibt, so daß sich die Feldlinien im erregten Zustand zwischen den Polschuhen 7.1 und 7.2 derart ausbilden, daß sie im Bereich des Zwischenringes durch die Bohrung 9 der Polschuhe verlaufen. In der Bohrung 9 ist ein magnetisierbarer Anschlag 10 angeordnet, so daß die Feldlinien, die von dem Polschuh 7.2 ausgehen, auch zu diesem Teil des Eisenkreises des Ma­gnetsystems gelangen. Dadurch wird bewirkt, daß sich die Summe der auf den An­ker 12 wirkenden Kräfte aus der des Tauchankermagnetsystems und der des an sich konventionellen Magnetsystems mit einem Zentralpol zusammensetzen. Die entstehende größere Magnetkraft - gegenüber einer der beiden Bauarten - bewirkt bei geschlossenem Ventil und damit bei dem größten auftretenden Luftspalt eine kürzere Anzugszeit und damit ein schnelleres Öffnen. Um ein magnetisches Kleben zwischen den Bauteilen Anker 12 und Anchlag 10 zu verhindern, ist eines dieser Bauteile auf der dem anderen Bauteil gegenüberliegenden Fläche mit einem nicht magnetisierbaren Überzug 10.1 versehen.An embodiment is shown schematically in the drawing and is described in more detail below. The injection valve 1 has an electrical connection 2, via which the electrical coil 3 is excited. The coil 3 is arranged on a non-magnetic coil support 4 and is located in the valve housing 5. The iron circuit of the magnet system is formed by an outer jacket 6 and two sleeve-shaped pole pieces 7.1, 7.2 located within the coil 3, so that the non-magnetic coil support between the coil and pole shoe comes to rest. Between the spaced-apart pole pieces there is a non-magnetizable area 8, which can be designed as an intermediate ring, which results in the effect of an air gap, so that the field lines are excited between the pole pieces 7.1 and 7.2 in such a way that they form in the Area of the intermediate ring through the hole 9 of the pole pieces. In the bore 9, a magnetizable stop 10 is arranged so that the field lines that start from the pole shoe 7.2, also reach this part of the iron circuit of the magnet system. This has the effect that the sum of the forces acting on the armature 12 is composed of that of the plunger armature magnet system and that of the magnet system which is conventional per se with a central pole. The resulting greater magnetic force - compared to one of the two types - results in a shorter tightening time and thus faster opening when the valve is closed and therefore with the largest air gap. In order to prevent magnetic sticking between the components anchor 12 and stop 10, one of these components is provided on the surface opposite the other component with a non-magnetizable coating 10.1.

Der nachstehend beschriebene Ventilaufbau ist nur als Beispiel zu verstehen und berührt nicht den erfinderischen Magnetkreis. Der Anschlag 10 weist eine Aufnahme für eine Feder 11 auf, die einen topfförmigen Anker 12 belastet, an dem eine Nadel 13 befestigt ist, deren anderes Ende einen Ventilverschließ­körper 14 trägt. Der Ventilverschließkörper 14 wird als Kugel ausgebildet und wirkt mit einem kegelförmigen Ventilsitz 15 zusammen und beherrscht einen Brennstoffaustritt 16, der zwischen einem Brennstoffzulauf 17 und einem Brenn­stoffrücklauf 18 angeordnet ist. Durch entsprechende Auswahl von Kugeldurch­messer 14 und Neigung des Ventilsitzkegels 15 ist es möglich, den Hub des An­kers so zu bestimmen, daß zwischen Ventilverschliekörper und Ventilsitz keine Drosselwirkung auftritt. Um bei hoher Schaltfrequenz einen großen Hub zu er­zielen, wird angestrebt, die zu bewegenden Massen geringzuhalten. Dazu wird ein Kugel mit geringem Durchmesser oder eine andere geeignete Konstruktion eingesetzt. Ein oder mehrere Öffnungen 20 sind im Boden 21 des Ankers 12 vorgesehen, damit sich bei seiner schnellen Bewegung keine Luftdruckpolster aufbauen können.The valve structure described below is only to be understood as an example and does not affect the inventive magnetic circuit. The stop 10 has a receptacle for a spring 11, which loads a cup-shaped armature 12 to which a needle 13 is attached, the other end of which carries a valve closing body 14. The valve closing body 14 is designed as a ball and interacts with a conical valve seat 15 and controls a fuel outlet 16 which is arranged between a fuel inlet 17 and a fuel return 18. By appropriate selection of ball diameter 14 and inclination of the valve seat cone 15, it is possible to determine the stroke of the armature so that no throttling effect occurs between the valve closing body and the valve seat. In order to achieve a large stroke at a high switching frequency, the aim is to keep the masses to be moved small. A small diameter ball or other suitable construction is used for this. One or more openings 20 are provided in the bottom 21 of the armature 12 so that no air pressure cushions can build up during its rapid movement.

In diesem Tauchankermagnetsystem sind der nicht magnetisierbare Bereich 8 und das in diesen Bereich hineinragende Ankerende 19 derart zueinander justiert, daß in nicht erregtem Zustand der Spule 3 der Anker 12 den überwiegenden Teil des nicht magnetisierbaren Bereiches 8 abdeckt. Das Maß dieser Abdeckung wird bei Festlegung der Ventilabmessungen bestimmt, um in einem weiteren Hubbereich einen günstigen Verlauf der Anzugskraft zu erhalten. In erregtem Zustand der Spule überdeckt der Anker diesen nicht magnetisierbaren Bereich auch in Hubrichtung. Der Ausdruck 'überdeckt' soll hierin bedeuten, daß im abgezogenen Zustand der Anker 12 gegen den An­schlag 10 derart anliegt, daß der Anker beidseitig über den nicht magnetisier­baren Bereich 8 übersteht. Hierdurch wird bewirkt, daß zu Beginn der Ankerbe­wegung der wesentliche Anteil des Magnetflusses von dem Polschuh 7.1 über den Anker 12 zur Hülse 7.2 fließt. Bei weiterem Anziehen des Ankers kommt es zur Umverteilung des Flusses, so daß ein zunehmend größerer Anteil direkt vom An­schlag 10 auf den Anker 12 übertritt. Durch eine derartige Anordnung läuft der aus Weicheisen gebildete Anker in erregtem Spulenzustand in das Magnetfeld hinein, wobei durch den zwischen den Polschuhen befindlichen nicht magnetisierbaren Bereich bei Beginn der Erregung die Feldlinien bereits so aufgebaut sind, daß sie teilweise bereits durch den Anker laufen. Mit dieser Anordnung wird nicht nur die höchste Schaltfrequenz erzielt, sondern die auf­tretenden Schaltkräfte sind gegenüber Ausführung lediglich nach dem Tauch­ankersystem oder lediglich nach einem System mit Zentralpol in jeder Schalt­stellung größer, so daß die vom Brennstoffdruck in Schließrichtung des Ventils auf den Ventilverschließkörper ausgeübte Schließkraft zusätzlich zur Feder­schließkraft sehr schnell überwunden werden kann.In this plunger armature magnet system, the non-magnetizable area 8 and the armature end 19 projecting into this area are adjusted relative to one another such that the armature 12 covers the major part of the non-magnetizable area 8 when the coil 3 is not energized. The dimension of this cover is determined when the valve dimensions are specified in order to obtain a favorable course of the tightening force in a further stroke range. When the coil is excited, the armature covers it Non-magnetizable area, also in the stroke direction. The term "covered" is intended to mean here that in the pulled-off state the armature 12 bears against the stop 10 in such a way that the armature projects beyond the non-magnetizable area 8 on both sides. This has the effect that, at the beginning of the armature movement, the essential part of the magnetic flux flows from the pole shoe 7.1 via the armature 12 to the sleeve 7.2. When the anchor is tightened further, the flow is redistributed, so that an increasingly larger portion passes directly from the stop 10 to the anchor 12. With such an arrangement, the armature formed from soft iron runs into the magnetic field in an excited coil state, the field lines already being built up by the non-magnetizable area between the pole shoes at the beginning of the excitation in such a way that some of them already run through the armature. With this arrangement, not only is the highest switching frequency achieved, but the switching forces that occur are greater compared to the design only according to the submersible anchor system or only according to a system with a central pole in each switching position, so that the closing force exerted by the fuel pressure in the closing direction of the valve on the valve closing body is additionally to Spring closing force can be overcome very quickly.

Claims (1)

Elektromagnetisch getaktetes Einspritzventil für gemischverdichtende Brenn­kraftmaschinen mit einem koaxial in der elektrischen Spule angeordneten, von einer Feder belasteten Anker, an dem der Ventilschließkörper befestigt ist, der einen Brennstoffaustritt steuert, wobei die elektrische Spule (3) von ei­nem aus einem Außenmantel und zwei hülsenförmigen, axial im Abstand zueinander angeordneten Polschuhen (7.1, 7.2) gebildeten Eisenkreis umschlossen ist, wobei der Abstand zwischen den hülsenförmigen, der Aufnahme des Ankers (12) dienenden Polschuhen (7.1, 7.2) durch einen nicht magnetisierbaren Bereich (8) gebildet ist, dem gegenüber der Anker (12) im nicht erregten Zustand der Spule (3) derart justiert ist, daß er mit einem Ende (19) den überwiegenden Teil des nicht magnetisierbaren Bereiches (8) abdeckt und im erregten Zustand diesen auch in Hubrichtung überdeckt, dadurch gekennzeichnet, daß im hülsenförmigen Polschuh (7.1) ein magnetisierbarer Anschlag (10) angeordnet ist.Electromagnetically clocked injection valve for mixture-compressing internal combustion engines with an armature, which is arranged coaxially in the electrical coil and is loaded by a spring and to which the valve closing body, which controls a fuel outlet, is fastened, the electrical coil (3) comprising one of an outer jacket and two sleeve-shaped, axial the iron circle formed at a distance from one another is enclosed, the distance between the sleeve-shaped pole shoes (7.1, 7.2) serving to receive the armature (12) being formed by a non-magnetizable region (8), opposite the Armature (12) in the non-excited state of the coil (3) is adjusted such that it covers one end (19) of the major part of the non-magnetizable area (8) and, when excited, also covers it in the stroke direction, characterized in that a magnetizable stop (10) is arranged in the sleeve-shaped pole shoe (7.1).
EP87118787A 1987-01-23 1987-12-18 Electromagnetic injection valve for compressed mixture engines Withdrawn EP0278099A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873701872 DE3701872A1 (en) 1987-01-23 1987-01-23 ELECTROMAGNETICLY CLOCKED INJECTION VALVE FOR MIXTURING COMPRESSING ENGINES
DE3701872 1987-01-23

Publications (1)

Publication Number Publication Date
EP0278099A1 true EP0278099A1 (en) 1988-08-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP87118787A Withdrawn EP0278099A1 (en) 1987-01-23 1987-12-18 Electromagnetic injection valve for compressed mixture engines

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EP (1) EP0278099A1 (en)
DE (1) DE3701872A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0446214B1 (en) * 1988-10-10 1995-01-18 Siemens Aktiengesellschaft Electromagnetic fuel injector with diaphragm spring
EP0725215A2 (en) * 1992-03-04 1996-08-07 Ficht GmbH &amp; Co. KG Fuel injection device working according to the solid energy accumulator principle, for internal combustion engines
WO1997040272A1 (en) * 1996-04-23 1997-10-30 Robert Bosch Gmbh Fuel injection device
WO1999019620A1 (en) * 1997-10-10 1999-04-22 Robert Bosch Gmbh Fuel injection valve

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5190223A (en) * 1988-10-10 1993-03-02 Siemens Automotive L.P. Electromagnetic fuel injector with cartridge embodiment
DE3834446A1 (en) * 1988-10-10 1990-04-12 Mesenich Gerhard ELECTROMAGNETIC INJECTION VALVE IN CARTRIDGE DESIGN
JPH03204486A (en) * 1989-12-29 1991-09-06 Aisin Aw Co Ltd Coil device of solenoid valve
DE4122983A1 (en) * 1991-07-11 1992-10-15 Hydraulik Ring Gmbh EM solenoid actuator for use as valve actuator - has coil mounted on former inset into yoke with end connections set in compound and coupled to connecting pins

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3301501A1 (en) * 1982-01-28 1983-08-04 General Motors Corp., Detroit, Mich. Electromagnetic fuel injection device
DE3439672A1 (en) * 1984-10-30 1986-04-30 Pierburg Gmbh & Co Kg, 4040 Neuss Electromagnetically timed injection value for mixture-compressing internal combustion engines

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4044324A (en) * 1976-04-30 1977-08-23 Ledex, Inc. Coil compressed plunger cavity components for a wet type solenoid
DE3317226A1 (en) * 1983-05-11 1984-11-15 bso Steuerungstechnik GmbH, 6603 Sulzbach ACTUATING MAGNET
DE3332801A1 (en) * 1983-09-12 1985-03-28 Robert Bosch Gmbh, 7000 Stuttgart Valve for gaseous or liquid media
DE3439671A1 (en) * 1984-10-30 1986-04-30 Pierburg Gmbh & Co Kg, 4040 Neuss Electromagnetically clocked injection valve for mixture-compressing internal combustion engines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3301501A1 (en) * 1982-01-28 1983-08-04 General Motors Corp., Detroit, Mich. Electromagnetic fuel injection device
DE3439672A1 (en) * 1984-10-30 1986-04-30 Pierburg Gmbh & Co Kg, 4040 Neuss Electromagnetically timed injection value for mixture-compressing internal combustion engines

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0446214B1 (en) * 1988-10-10 1995-01-18 Siemens Aktiengesellschaft Electromagnetic fuel injector with diaphragm spring
EP0725215A2 (en) * 1992-03-04 1996-08-07 Ficht GmbH &amp; Co. KG Fuel injection device working according to the solid energy accumulator principle, for internal combustion engines
EP0725215A3 (en) * 1992-03-04 1996-08-21 Ficht Gmbh & Co Kg
WO1997040272A1 (en) * 1996-04-23 1997-10-30 Robert Bosch Gmbh Fuel injection device
WO1999019620A1 (en) * 1997-10-10 1999-04-22 Robert Bosch Gmbh Fuel injection valve
US6186472B1 (en) 1997-10-10 2001-02-13 Robert Bosch Gmbh Fuel injection valve

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