EP0444055A1 - Solenoid valve, in particular for fuel injection pumps. - Google Patents

Solenoid valve, in particular for fuel injection pumps.

Info

Publication number
EP0444055A1
EP0444055A1 EP19890911988 EP89911988A EP0444055A1 EP 0444055 A1 EP0444055 A1 EP 0444055A1 EP 19890911988 EP19890911988 EP 19890911988 EP 89911988 A EP89911988 A EP 89911988A EP 0444055 A1 EP0444055 A1 EP 0444055A1
Authority
EP
European Patent Office
Prior art keywords
valve
control device
excitation winding
winding
needle
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
EP19890911988
Other languages
German (de)
French (fr)
Other versions
EP0444055B1 (en
Inventor
Joachim Tauscher
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0444055A1 publication Critical patent/EP0444055A1/en
Application granted granted Critical
Publication of EP0444055B1 publication Critical patent/EP0444055B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/28—Interface circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/0007—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for using electrical feedback
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F7/1607—Armatures entering the winding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/063—Lift of the valve needle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D41/2096—Output circuits, e.g. for controlling currents in command coils for controlling piezoelectric injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/24—Fuel-injection apparatus with sensors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8158—With indicator, register, recorder, alarm or inspection means
    • Y10T137/8225—Position or extent of motion indicator
    • Y10T137/8242—Electrical

Definitions

  • Solenoid valve especially for single-fuel dummies
  • the invention relates to a solenoid valve, in particular for fuel injection pumps, of the type defined in the preamble of claim 1.
  • the closing time of the solenoid valve determines the injection duration and, for a given nozzle cross section of the injection nozzle, the fuel injection quantity.
  • the solenoid valves generally have constant switching times, which are determined by the design. This results, for example, from the elimination of the activation of the electromagnet until the valve is actually fully opened, in which fuel is still injected becomes. The end of the fuel injection phase is over. the kon s aunt switching time of the valve when the valve open after the predetermined by the control means switching-off of the electromagnet.
  • specimen scatter ⁇ of the solenoid valves and long-term drift lead to temporal
  • the switch position transmitter has a disk made of piezoceramic material, which is integrated in the stroke stop.
  • the solenoid valve is opened after the magnetic excitation ceases, the valve needle lifting off the valve seat under the action of the valve opening spring hits the piezoceramic disk.
  • a voltage is generated which is fed to the control device as a valve open signal and is evaluated there accordingly.
  • the two electrical outputs of the piezoceramic disk are connected to an insulated two-wire cable that is passed through the valve housing. This means additional processing steps on the valve housing, an additional electrical connecting line in addition to the electrical connection for the magnetic excitation coil and additional assembly work.
  • the solenoid valve according to the invention with the characterizing features of claim 1 has the advantage that the electrical signal generated by the piezoceramic when the valve needle strikes without additional
  • Transmission path is transmitted to the control device.
  • Electromagnets are used. Is the magnetic excitation turned off, which is done by opening the generally formed as a transistor output stage switching element in the control device, so is the return conductor of the two-wire kausle 'itung mass coupled. The charges generated when the valve needle strikes the piezoceramic lead to the parasitic capacitances of the diode connected upstream of the excitation winding, of the output stage transistor of the control device and of the connecting line between the control device and
  • Electromagnets to a voltage pulse that can be removed at the output terminal of the control device connected to the return wire.
  • This voltage pulse represents a signal for recognizing the valve open position. If the voltage input is not taken directly at the output terminal of the control device but via a capacitor, the superimposed DC supply voltage is eliminated and the valve open signal is obtained as a significant voltage pulse that exceeds the zero potential.
  • FIG. 1 shows a longitudinal section of a solenoid valve with control device for valve switching
  • Fig. 3 different time-dependent diagrams, namely the control pulse for the transistor output stage in the control device (a), the current profile in the field winding of the solenoid valve (b), the stroke of the valve needle of the solenoid valve (c) and the voltage at the one output terminal the control device (d above) or at an acceptance point for the valve open signal (d below) connected to this output terminal.
  • the 2/2-way solenoid valve shown in longitudinal section in FIG. 1 has a valve housing 10 with a screw-in pin 11, with which the valve housing " 10 can be screwed into a socket in the housing of a fuel distributor injection pump, in such a way that the valve at the same time
  • the pump working space of the injection pump is limited DE 36 33 107 AI described.
  • a high-pressure bore 12 runs from the valve inlet 13 to a valve opening 15 enclosed by a valve seat 14.
  • a valve space 16 lying beyond the valve opening 15 is over at least one
  • Relief bore 17 connected to a valve outlet 18.
  • a conical or mushroom-shaped section 19 of a valve needle 20 cooperates with the valve seat 14 and is guided axially displaceably with a cylindrical section 21 in a guide bore 22 that continues from the valve chamber 16.
  • the guide bore 22 is located within a central core 23 which is integral with the valve housing 10 and which is surrounded by a magnet coil 24 of an electromagnet 25.
  • At the end facing away from the conical or mushroom-shaped section 19 is the end facing away from the conical or mushroom-shaped section 19.
  • Valve needle 20 * connected to an armature plate 26 of the electromagnet 25.
  • a compression spring 27 acting in the valve opening direction is clamped, which, when the magnet coil 24 is not energized, places the armature plate 26 against a stop 28 for limiting the stroke of the valve needle 20.
  • the magnet coil 24 is wound on a coil carrier 29 and inserted into a magnet pot 30, which concentrically surrounds the core 23 of the valve housing 10.
  • the magnet pot 30 is covered by a plate-shaped yoke 31 which the armature plate 26 is opposite with an air gap corresponding to the stroke of the valve needle 20.
  • the yoke 31 is pressed onto the magnet pot 30 resting on the valve housing 10 by means of a pot-like intermediate flange 32 carrying the stop 28.
  • the intermediate flange 32 is in turn held immovably by a housing cover 33 placed on the valve housing 10.
  • a two-wire electrical connecting cable 34 is passed through the housing cover 33, the intermediate flange 32 and the yoke 31 in an insulated manner, the two connecting ends 35, 36 (Fig. 2) is connected to one winding end 37 or 38 of the solenoid 24.
  • the connecting cable 34 which has a supply line 48 and a return line 49, is connected to a control device 40, which in turn is connected to a DC voltage, generally connected to the motor vehicle battery 39.
  • the "control device 40 is used to switch the solenoid valve, that is to say to close the valve and to open the valve, for which purpose the solenoid 24 is supplied with direct current or is again separated from the direct voltage
  • the solenoid valve is essentially determined by the duration of the excitation of the solenoid 24.
  • the control device 40 has two output terminals 41, 42 for connecting the connecting cable 34 and an input terminal 43 for connecting the positive pole of the
  • the output terminal 41 is directly connected to the input terminal 43, while the output terminal 42 is connected to ground or zero potential via a transistor output stage 44, which is symbolically represented here by a switch.
  • the trasistor output stage 44 is controlled by control electronics 45 of the control device 40 as a function of various operating parameters of an internal combustion engine equipped with the fuel injection pump, such as load, speed, temperature, and - to compensate for switching times of the solenoid valve caused by control - taking into account the switching position of the valve, that is, the position of the valve needle 20.
  • FIG. 3 shows a control pulse supplied to the transistor output stage 44 from the control electronics 45 in diagram a.
  • the transistor output stage 44 closes for the duration of this pulse and the magnet coil 24 of the electromagnet 25 is connected to the motor vehicle battery 39 connected.
  • a current flows in the magnetic coil 24, as shown in diagram b of FIG. 3.
  • the anchor plate 26 is attracted to the yoke 31 and the portion 19 of the valve needle is seated on the valve seat 14 with the valve opening 15 closed.
  • the solenoid valve is closed.
  • the drive pulse ceases and transistor output stage 44 opens.
  • the current in the magnet coil 24 goes to zero with a time delay.
  • valve needle 20 When the excitation of the magnetic coil 24 ceases, the valve needle 20 begins to lift off from the valve seat 14 under the action of the compression spring 27 and strikes the stop 28 on the intermediate flange 32 at the point in time ty.
  • the time dependence of the valve needle stroke S is shown in diagram c of FIG. 3.
  • the stroke curve S of the valve needle 20 At time ty, the stroke curve S of the valve needle 20 has reached its zero point again, and the solenoid valve is fully open, so that the high-pressure bore 12 and the relief bore 17 are connected to one another.
  • the injection phase of the fuel injection pump defined by point in time tg is extended, which leads to an undesired increase in the fuel injection quantity. Knowing the point in time y is therefore essential for correcting the injection quantity.
  • a switch position transmitter 46 which has a piezoceramic disk 47 arranged on the stop 28. As soon as the valve needle 20 hits the piezoceramic disk 47 at the time ty, electrical charges are generated in it, which lead to a voltage pulse which can be evaluated as a measure of the valve open position (valve open signal) in the control electronics 45 to correct the time tg.
  • the connecting cable 34 is used to transmit the voltage pulse from the solenoid valve to the control device 40, so that no separate signal line is required.
  • the output 52 of the piezoceramic disk 47 carrying the lower potential is connected to the connection end 35 of the Supply line 48 or the anode of diode 50.
  • output 41 can also be connected directly to ground or zero potential, as indicated by the dashed lines in Fig. 2.
  • second output terminal 42 is connected via a capacitor 53 and an amplifier 54 with the control electro nik 45 connected.
  • a series circuit comprising a zener diode 55 and a blocking diode 56 is arranged between the two output terminals 41, 42, the forward direction of the zener diode 55 being directed towards the second output terminal 42 and the forward direction of the blocking diode 56 towards the first output terminal 41.
  • Input 57 of control electronics 45 (the voltage curve shown in diagram d) ' of FIG. 3 below.
  • the second bump is the valve open signal.

Abstract

Dans une soupape magnétique, notamment pour pompes d'injection de carburant, la position terminale du pointeau (20), lorsque le siège de soupape (14) est ouvert, est détectée par un indicateur de position de commande (46) qui comporte un élément céramique piézo-électrique (47) disposé dans une butée de fin de course (28) destinée au pointeau (20). Le signal de soupape ouverte généré par l'élément céramique piézo-électrique (47) lors du contact avec le pointeau (20) est transmis au dispositif de commande (40) de la soupape magnétique par le câble de raccordement bifilaire (34) nécessaire pour exciter les électro-aimants (25) de la soupape magnétique. A cet effet, l'élément de commutation (44) dans le dispositif de commande (40), qui actionne les aimants, est relié en aval, vu dans le sens du courant, à la bobine excitatrice (24) via la ligne de retour (49) du câble de raccordement (34), et l'élément céramique piézo-électrique (47) est relié en parallèle avec les sorties électriques (51, 52) du circuit en série constitué d'une diode (50) et de la bobine excitatrice (24).In a magnetic valve, in particular for fuel injection pumps, the end position of the needle (20), when the valve seat (14) is open, is detected by a control position indicator (46) which has an element piezoelectric ceramic (47) arranged in an end-of-travel stop (28) intended for the needle (20). The open valve signal generated by the piezoelectric ceramic element (47) upon contact with the needle (20) is transmitted to the control device (40) of the magnetic valve by the two-wire connection cable (34) necessary for excite the electromagnets (25) of the magnetic valve. To this end, the switching element (44) in the control device (40), which actuates the magnets, is connected downstream, seen in the direction of the current, to the excitation coil (24) via the return line. (49) of the connection cable (34), and the piezoelectric ceramic element (47) is connected in parallel with the electrical outputs (51, 52) of the series circuit consisting of a diode (50) and the excitation coil (24).

Description

Magnetventil, insbesondere für KraftstoffeinsoritzDumoenSolenoid valve, especially for single-fuel dummies
Stand der TechnikState of the art
Die Erfindung betrifft ein Magnetventil, insbesondere für Kraftstoffeinspritzpumpen, der im Oberbegriff des Anspruchs 1 definierten Gattung.The invention relates to a solenoid valve, in particular for fuel injection pumps, of the type defined in the preamble of claim 1.
Beim Einsatz in Kraftstoffeinspritzpumpen werden solche Magnetventile in den Hochdruckkanal derWhen used in fuel injection pumps, such solenoid valves are in the high pressure channel
Kraftstoffeinspritzpumpe eingesetzt und zur Steuerung der pro Pumpenkolbenhub eingespritzten Kraftstoffmenge verwendet. Dabei bestimmt die Schließzeit des Magnetventils die Einspritzdauer und bei vorgegebenem Düsenquerschnitt de Einspritzdüse die Kraftstoffeinspritzmenge. Die Magnetventile haben im allgemeinen konstante Schaltzeiten, die konstruktiv bestimmt sind. Damit ergibt sich z.B. vom Wegfall der Ansteuerung des Elektromagneten bis zum tatsächlichen vollen Öffnen des Ventils eine Zeitverzögerung, in welcher noch Kraftstoff eingespritzt wird. Das Ende der Kraftstoffeinspritzphase liegt damit um. die konstante Schaltzeit des Ventils beim Ventilöffnen hinter dem von der Steuereinrichtung vorgegebenen Abschaltzeitpunkt des Elektromagneten. Außerdem führen auch Exemplarstreuungen ~ der Magnetventile sowie Langzeitdrift zu zeitlichenFuel injection pump used and used to control the amount of fuel injected per pump piston stroke. The closing time of the solenoid valve determines the injection duration and, for a given nozzle cross section of the injection nozzle, the fuel injection quantity. The solenoid valves generally have constant switching times, which are determined by the design. This results, for example, from the elimination of the activation of the electromagnet until the valve is actually fully opened, in which fuel is still injected becomes. The end of the fuel injection phase is over. the kon s aunt switching time of the valve when the valve open after the predetermined by the control means switching-off of the electromagnet. In addition, specimen scatter ~ of the solenoid valves and long-term drift lead to temporal
Unterschieden zwischen dem Wegfall αer Magneterregung und dem tatsächlichen Öffnen des Magnetventils/ was sich negativ auf die korrekte Kraftstoffzumessung während der Einspritzphase auswirkt. Bei solchen Magnetventilen hat man daher einen Schaltstellungsgeber vorgesehen, mit welchem die beiden Schaltstellungen der Ventilnadel, nämlich Aufsetzen auf dem Ventilsitz (Ventil geschlossen) und Anschlagen an dem Hubanschlag (Ventil voll geöffnet) detektiert werden. Mit Kenntnis dieser Schaltstellungen der Ventilnadel kann die eingespritzte Kraftstoffmenge hochgenau dosiert werden.Differences between the loss of magnetic excitation and the actual opening of the solenoid valve / which has a negative effect on the correct fuel metering during the injection phase. In such solenoid valves, therefore, a switch position transmitter has been provided, with which the two switch positions of the valve needle, namely placement on the valve seat (valve closed) and stops at the stroke stop (valve fully open) are detected. With knowledge of these switch positions of the valve needle, the amount of fuel injected can be metered with high precision.
Bei einem bekannten Magnetventil für eine Kraftstoffeinspritzpumpe der eingangs genannten Art (DE 36 33 107 AI) weist der Schaltstellungsgeber eine Scheibe aus piezokeramischem Material auf, die in dem Hubanschlag integriert ist. Bei Öffnen des Magnetventils nach Wegfall der Magneterregung schlägt die unter der Wirkung αer Ventilöff ungsfeder vom Ventilsitz abhebende Ventilnadel auf die piezokeramische Scheibe auf. Dadurch wird eine Spannung erzeugt, die als Ventiloffensignal der Steuereinrichtung zugeführt und dort entsprechend ausgewertet wird. Hierzu sind die beiden elektrischen Ausgänge der piezokeramischen Scheibe an einem isoliert durch das Ventilgehäuse hindurchgeführten zweiadrigen Kabel angeschlossen. Dies bedeutet zusätzliche Bearbeitungsschritte am Ventilgehäuse, eine zu der elektrischen Verbindung für die Magneterregerspule zusätzliche elektrische Verbindungsleitung und zusätzlichen Montageaufwan . Vorteile der ErfindungIn a known solenoid valve for a fuel injection pump of the type mentioned at the beginning (DE 36 33 107 AI), the switch position transmitter has a disk made of piezoceramic material, which is integrated in the stroke stop. When the solenoid valve is opened after the magnetic excitation ceases, the valve needle lifting off the valve seat under the action of the valve opening spring hits the piezoceramic disk. As a result, a voltage is generated which is fed to the control device as a valve open signal and is evaluated there accordingly. For this purpose, the two electrical outputs of the piezoceramic disk are connected to an insulated two-wire cable that is passed through the valve housing. This means additional processing steps on the valve housing, an additional electrical connecting line in addition to the electrical connection for the magnetic excitation coil and additional assembly work. Advantages of the invention
Das erfindungsgemäße Magnetventil mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß das von der Piezokeramik beim Auftreffen der Ventilnadel erzeugte elektrische Signal ohne zusätzlicheThe solenoid valve according to the invention with the characterizing features of claim 1 has the advantage that the electrical signal generated by the piezoceramic when the valve needle strikes without additional
Übertragungsstrecke an die Steuereinrichtung übermittelt wird. Durch die erfindungsgemäßen Maßnahmen kann hierzu die ohnehin vorhandene und erforderliche zweiadrige Verbindungsleitung zwischen Steuereinrichtung und Magneterregerwicklung, die der Ansteuerung desTransmission path is transmitted to the control device. By means of the measures according to the invention, the already existing and necessary two-wire connecting line between the control device and the magnetic field winding, which controls the
Elektromagneten dient, verwendet werden. Wird die Magneterregung abgeschaltet, was durch Öffnen des im allgemeinen als Transistorendstufe ausgebildeten Schaltelements in der Steuereinrichtung erfolgt, so ist die Rückführader der zweiadrigen Verbindungsle'itung von Masse angekoppelt. Die beim Aufschlagen der Ventilnadel auf der Piezokeramik erzeugten Ladungen führen in den parasitären Kapazitäten der der Erregerwicklung vorgeschalteten Diode, des Endstufentransistors der Steuereinrichtung und αer Verbindungsleitung zwischen Steuereinrichtung undElectromagnets are used. Is the magnetic excitation turned off, which is done by opening the generally formed as a transistor output stage switching element in the control device, so is the return conductor of the two-wire Verbindungsle 'itung mass coupled. The charges generated when the valve needle strikes the piezoceramic lead to the parasitic capacitances of the diode connected upstream of the excitation winding, of the output stage transistor of the control device and of the connecting line between the control device and
Elektromagneten zu einem Spannungsimpuls , der an der mit der Rückführader verbundenen Ausgangsklemme der Steuereinrichtung abgenommen werden kann. Dieser Spannungsimpuls stellt ein Signal zur Erkennung der Ventiloffenstellung dar. Wird der Spannungsinrouls nicht unmittelbar an der Ausgangskle me der Steuereinrichtung sondern über einen Kondensator abgenommen, so wird die überlagerte Versorgungsgleichspannung eliminiert und das Ventilof ensignal wird als ein Nullpotential übersteigernder, signifikanter Spannungsimpuls erhalten.Electromagnets to a voltage pulse that can be removed at the output terminal of the control device connected to the return wire. This voltage pulse represents a signal for recognizing the valve open position. If the voltage input is not taken directly at the output terminal of the control device but via a capacitor, the superimposed DC supply voltage is eliminated and the valve open signal is obtained as a significant voltage pulse that exceeds the zero potential.
Durch die in Anspruch 2 aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Magnetventils möglich .The measures listed in claim 2 are advantageous further developments and improvements in Claim 1 specified solenoid valve possible.
Zeichnungdrawing
Die Erfindung ist anhand eines in der Zeichnung dargestellten Ausführungsbeispiels in der nachfolgenden Beschreibung näher erläutert. Es zeigen:The invention is explained in more detail in the following description with reference to an embodiment shown in the drawing. Show it:
Fig. 1 einen Längsschnitt eines Magnetventils mit Steuereinrichtung zum Ventilschalten,1 shows a longitudinal section of a solenoid valve with control device for valve switching,
Fig. 2 ein elektrisches Schaltbild von Magnetventil mit Steuereinrichtung,2 is an electrical circuit diagram of the solenoid valve with control device,
Fig. 3 verschiedene zeitabhängige Diagramme, und zwar des AnSteuerimpulses für die Transistorend- stufe in der Steuereinrichtung (a) , des Stromverlaufs in der Erregerwicklung des Magnetventils (b), des Hubs der Ventilnadel des Magnetventils (c) und der Spannung an der einen Ausgangsklemme der Steuereinrichtung (d oben) bzw. an einem an dieser Ausgangsklemme angeschlossenen Abnahmepunkt für das Ventiloffensignal (d unten).Fig. 3 different time-dependent diagrams, namely the control pulse for the transistor output stage in the control device (a), the current profile in the field winding of the solenoid valve (b), the stroke of the valve needle of the solenoid valve (c) and the voltage at the one output terminal the control device (d above) or at an acceptance point for the valve open signal (d below) connected to this output terminal.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Das in Fig. 1 im Längsschnitt dargestellte 2/2-Wege- Magnetventil weist ein Ventilgehäuse 10 mit einem Einschraubzapfen 11 auf, mit welchem das Ventilgehäuse" 10 in eine Buchse im Gehäuse einer Kraftstoffverteilereinspritz- pumpe eingeschraubt werden kann, derart, daß das Ventil zugleich dem Pumpenarbeitsraum der Einspritzpumpe begrenzt. Eine solche KraftstoffVerteiler- einspr_itzpumpe mit eingesetztem Magnetventil ist beispielsweise in der DE 36 33 107 AI beschrieben. In dem Einschraubzapfen 11 verläuft eine Hochdruckbohrung 12 von dem Ventileinlaß 13 bis hin zu einer von einem Ventilsitz 14 umschlossenen Ventilöffnung 15. Ein jenseits der Ventilöffnung 15 liegender Ventilraum 16 ist über mindestens eineThe 2/2-way solenoid valve shown in longitudinal section in FIG. 1 has a valve housing 10 with a screw-in pin 11, with which the valve housing " 10 can be screwed into a socket in the housing of a fuel distributor injection pump, in such a way that the valve at the same time The pump working space of the injection pump is limited DE 36 33 107 AI described. In the screw-in pin 11, a high-pressure bore 12 runs from the valve inlet 13 to a valve opening 15 enclosed by a valve seat 14. A valve space 16 lying beyond the valve opening 15 is over at least one
Entlastungsbohrung 17 mit einem Ventilauslaß 18 verbunden. Mit dem Ventilsitz 14 arbeitet ein kegel- oder pilzförmig ausgebildeter Abschnitt 19 einer Ventilnadel 20 zusammen, die mit einem zylindrischen Abschitt 21 in einer sich vom Ventilraum 16 fortsetzenden Führungsbohrung 22 axial verschieblich geführt ist. Die Führungsbohrung 22 befindet sich innerhalb eines mit dem Ventilgehäuse 10 einstückigen zentralen Kerns 23, der von einer Magnetspule 24 eines Elektromagneten 25 umgeben ist. An dem dem kegel- oder pilzförmigen Abschnitt 19 abgekehrten Ende ist dieRelief bore 17 connected to a valve outlet 18. A conical or mushroom-shaped section 19 of a valve needle 20 cooperates with the valve seat 14 and is guided axially displaceably with a cylindrical section 21 in a guide bore 22 that continues from the valve chamber 16. The guide bore 22 is located within a central core 23 which is integral with the valve housing 10 and which is surrounded by a magnet coil 24 of an electromagnet 25. At the end facing away from the conical or mushroom-shaped section 19 is the
Ventilnadel 20* mit einer Ankerplatte 26 des Elektromagneten 25 verbunden. Zwischen der Ankerplatte 26 und dem Kern 23 des Ventilgehäuses 10 ist eine in Ventilöffnungsrichtung wirkende Druckfeder 27 eingespannt, welche die Ankerplatte 26 bei nicht erregter Magnetspule 24 an einen Anschlag 28 zur Hubbegrenzung der Ventilnadel 20 legt. Die Magnetspule 24 ist auf einen Spulenträger 29 aufgewickelt und in einen Magnettopf 30 eingesetzt, der den Kern 23 des Ventilgehäuses 10 konzentrisch umschließt. Der Magnettopf 30 ist von einem plattenför igen Joch 31 abgedeckt, dem die Ankerplatte 26 mit einem dem Hub der Ventilnadel 20 entsprechenden Luftspalt gegenüberliegt. Das Joch 31 ist mittels eines den Anschlag 28 tragenden topfartigen Zwischenflansches 32 an den am Ventilgehäuse 10 anliegenden Magnettopf 30 angedrückt. Der Zwischenflansch 32 ist seinerseits von einem auf das Ventilgehäuse 10 aufgesetzten Gehäusedeckel 33 unverschieblich gehalten.Valve needle 20 * connected to an armature plate 26 of the electromagnet 25. Between the armature plate 26 and the core 23 of the valve housing 10, a compression spring 27 acting in the valve opening direction is clamped, which, when the magnet coil 24 is not energized, places the armature plate 26 against a stop 28 for limiting the stroke of the valve needle 20. The magnet coil 24 is wound on a coil carrier 29 and inserted into a magnet pot 30, which concentrically surrounds the core 23 of the valve housing 10. The magnet pot 30 is covered by a plate-shaped yoke 31 which the armature plate 26 is opposite with an air gap corresponding to the stroke of the valve needle 20. The yoke 31 is pressed onto the magnet pot 30 resting on the valve housing 10 by means of a pot-like intermediate flange 32 carrying the stop 28. The intermediate flange 32 is in turn held immovably by a housing cover 33 placed on the valve housing 10.
Durch Gehäusedeckel 33, Zwischenflansch 32 und Joch 31 ist ein zweiadriges elektrisches Verbindungskabel 34 isoliert hindurchgeführt, das mit seinen beiden Anschlußenden 35,36 (Fig. 2) mit jeweils einem Wicklungsende 37 bzw. 38 der Magnetspule 24 verbunden ist. Das eine Zuführleitung 48 und eine Rückführleitung 49 aufweisende Verbindungskabel 34 ist mit einer Steuereinrichtung 40 verbunden, die ihrerseits an eine Gleichspannung gelegt, im allgemeinen mit der Kraftfahrzeugbatterie 39 verbunden ist. Die "Steuereinrichtung 40 dient zum Schalten des Magnetventils, also zum Ventilschließen und zum Ventilöffnen, wozu die Magnetspule 24 mit Gleichstrom versorgt bzw. wieder von der Gleichspannung getrennt wird. Die Schließdauer desA two-wire electrical connecting cable 34 is passed through the housing cover 33, the intermediate flange 32 and the yoke 31 in an insulated manner, the two connecting ends 35, 36 (Fig. 2) is connected to one winding end 37 or 38 of the solenoid 24. The connecting cable 34, which has a supply line 48 and a return line 49, is connected to a control device 40, which in turn is connected to a DC voltage, generally connected to the motor vehicle battery 39. The "control device 40 is used to switch the solenoid valve, that is to say to close the valve and to open the valve, for which purpose the solenoid 24 is supplied with direct current or is again separated from the direct voltage
Magnetventils wird dabei im wesentlichen von der Zeitdauer der Erregung αer Magnetspule 24 bestimmt.The solenoid valve is essentially determined by the duration of the excitation of the solenoid 24.
Die Steuereinrichtung 40 weist zwei Ausgangsklemmen 41,42 zum Anschließen des Verbindungskabels 34 und eine Eingangsklemme 43 zum Anschließen des Pluspoles derThe control device 40 has two output terminals 41, 42 for connecting the connecting cable 34 and an input terminal 43 for connecting the positive pole of the
Kraftfahrzeugbatterie 39 auf. Die Ausgangsklemme 41 ist dabei unmittelbar mit der Eingangsklemme 43 verbunden, während die Ausgangsklemme 42 über eine Transistorendstufe 44, die hier symbolisch durch einen Schalter dargestellt ist, an Masse bzw. Nullpotential gelegt ist. Die Ansteuerung der Trasistorendstufe 44 erfolgt durch eine Steuerelektronik 45 der Steuereinrichtung 40 in Abhängigkeit von verschiedenen Betriebskenngrößen einer mit der Kraftstoffeinspritzpumpe ausgerüsteten Brennkraftmaschine, wie Last, Drehzahl, Temperatur, und - um kontruktiv bedingte Schaltzeiten des Magnetventils zu kompensieren - unter Berücksichtigung der Schaltstellung des Ventils, also der Stellung der Ventilnadel 20.Motor vehicle battery 39 on. The output terminal 41 is directly connected to the input terminal 43, while the output terminal 42 is connected to ground or zero potential via a transistor output stage 44, which is symbolically represented here by a switch. The trasistor output stage 44 is controlled by control electronics 45 of the control device 40 as a function of various operating parameters of an internal combustion engine equipped with the fuel injection pump, such as load, speed, temperature, and - to compensate for switching times of the solenoid valve caused by control - taking into account the switching position of the valve, that is, the position of the valve needle 20.
In Fig. 3 ist im Diagramm a ein der Transistorendstufe 44 von der Steuerelektronik 45 zugeführter Ansteuerimpuls dargestellt.- Für die Dauer dieses Impulses schließt die Transistorendstufe 44 und die Magnetspule 24 des Elektromagneten 25 wird an die Kraftfahrzeugbatterie 39 angeschlossen. In der Magnetspule 24 fließt ein Strom, wie er im Diagramm b der Fig. 3 dargestellt ist. Die Ankerplatte 26 ist an das Joch 31 angezogen und der Abschnitt 19 der Ventilnadel sitzt unter Abschluß der Ventilöffnung 15 auf dem Ventilsitz 14 auf. Das Magnetventil ist geschlossen. Im Zeitpunkt tQ fällt der Ansteuerimpuls weg und die Transistorendstufe 44 öffnet. Der Strom in der Magnetspule 24 geht zeitverzögert auf Null. Mit Wegfall der Erregung der Magnetspule 24 beginnt sich die Ventilnadel 20 unter der Wirkung der Druckfeder 27 vom Ventilsitz 14 abzuheben und schlägt im Zeitpunkt ty an dem Anschlag 28 am Zwischenflansch 32 an. Die Zeitabhängigkeit des Ventilnadelhubs S ist im Diagramm c der Fig. 3 dargestellt. Im Zeitpunkt ty hat die Hubkurve S der Ventilnadel 20 wieder ihren Nullpunkt erreicht, und das Magnetventil ist voll geöffnet, so daß Hochdruckbohrung 12 und Entlastungsbohrung 17 miteinander verbunden sind. Bis zu diesem Zeitpunkt ty wird die durch den Zeitpunkt tg festgelegte Einspritzphase der Kraftstoffeinspritzpumpe verlängert, was zu einer nicht gewünschten Vergrößerung der Kraftstoffeinspritzmenge führt. Die Kenntnis des Zeitpunktes y ist daher für die Korrektur der Einspritzmenge von wesentlicher Bedeutung. Um diesen Zeitpunkt ty zu erfassen, ist ein Schaltstellungsgeber 46 vorgesehen, der eine am Anschlag 28 angeordnete piezokeramische Scheibe 47 aufweist. Sobald die Ventilnadel 20 im Zeitpunkt ty auf der piezokeramischen Scheibe 47 aufschlägt, werden in dieser elektrische Ladungen erzeugt, die zu einem Spannungsimpuls führen, der als Maß für die Ventiloffenstellung (Ventiloffensignal) in der Steuerelektronik 45 zur Korrektur des Zeitpunktes tg ausgewertet werden kann.3 shows a control pulse supplied to the transistor output stage 44 from the control electronics 45 in diagram a. The transistor output stage 44 closes for the duration of this pulse and the magnet coil 24 of the electromagnet 25 is connected to the motor vehicle battery 39 connected. A current flows in the magnetic coil 24, as shown in diagram b of FIG. 3. The anchor plate 26 is attracted to the yoke 31 and the portion 19 of the valve needle is seated on the valve seat 14 with the valve opening 15 closed. The solenoid valve is closed. At time t Q , the drive pulse ceases and transistor output stage 44 opens. The current in the magnet coil 24 goes to zero with a time delay. When the excitation of the magnetic coil 24 ceases, the valve needle 20 begins to lift off from the valve seat 14 under the action of the compression spring 27 and strikes the stop 28 on the intermediate flange 32 at the point in time ty. The time dependence of the valve needle stroke S is shown in diagram c of FIG. 3. At time ty, the stroke curve S of the valve needle 20 has reached its zero point again, and the solenoid valve is fully open, so that the high-pressure bore 12 and the relief bore 17 are connected to one another. Up to this point in time ty, the injection phase of the fuel injection pump defined by point in time tg is extended, which leads to an undesired increase in the fuel injection quantity. Knowing the point in time y is therefore essential for correcting the injection quantity. In order to detect this point in time ty, a switch position transmitter 46 is provided which has a piezoceramic disk 47 arranged on the stop 28. As soon as the valve needle 20 hits the piezoceramic disk 47 at the time ty, electrical charges are generated in it, which lead to a voltage pulse which can be evaluated as a measure of the valve open position (valve open signal) in the control electronics 45 to correct the time tg.
Zur Übertragung des Spannungsimpulses von dem Magnetventil zur S euereinrichtung 40 wird das Verbindungskabel 34 benutzt, so daß keine separate Signalleitung erforderlich wird. Hierzu wird zwischen dem Anschlußende 35 der mit der Ausgangsklemme 41 verbundenen Zuführleitung 48 des Verbindungskabels 34 und dem damit verbundenen Wicklungsende 37 der Magnetspule 24 eine Diode 50 eingeschaltet, die so gepolt ist, daß ihre Durchlaßrichtung zur Magnetspule 24 "weist. Von den elektrischen Ausgängen 51,52 der piezoelektrischen Scheibe 47 wird der das höhere Potential führende Ausgang 51 mit dem Wicklungsende 38 der Magnetspule 24 verbunden, das über die Rückführleitung 49 des Verbindungskabels 34 an der zweiten Ausgangsklemme 42 der Steuereinrichtung 40 angeschlossen ist. Der das niedrigere Potential führende Ausgang 52 der piezokeramischen Scheibe 47 ist mit dem Anschlußende 35 der Zuführleitung 48 bzw. der Anode der Diode 50 verbunden. Alternativ kann der Ausgang 41 auch unmittelbar an Masse bzw. Nullpotential gelegt werden, wie dies in Fig. 2 strichliniert angedeutet ist. In der Steuereinrichtung 40 ist die zweite Ausgangsklemme 42 über einen Kondensator 53 und einen Verstärker 54 mit der Steuerelektronik 45 verbunden. Zur Spannungsbegrenzung ist noch zwischen den beiden Ausgangsklemmen 41,42 eine Reihenschaltung aus Zenerdiode 55 und Sperrdiode 56 angeordnet, wobei die Durchlaßrichtung der Zenerdiode 55 zu der zweiten Ausgangsklemme 42 und die Durchlaßrichtung der Sperrdiode 56 zu der ersten Ausgangsklemme 41 hin gerichtet ist.The connecting cable 34 is used to transmit the voltage pulse from the solenoid valve to the control device 40, so that no separate signal line is required. For this purpose, the with the Output terminal 41 connected supply line 48 of the connecting cable 34 and the associated winding end 37 of the solenoid 24, a diode 50 turned on, which is polarized so that its direction of passage points to the solenoid 24 " . From the electrical outputs 51, 52 of the piezoelectric disk 47, this is the higher potential output 51 connected to the winding end 38 of the solenoid 24 which is connected via the return line 49 of the connecting cable 34 to the second output terminal 42 of the control device 40. The output 52 of the piezoceramic disk 47 carrying the lower potential is connected to the connection end 35 of the Supply line 48 or the anode of diode 50. Alternatively, output 41 can also be connected directly to ground or zero potential, as indicated by the dashed lines in Fig. 2. In control device 40, second output terminal 42 is connected via a capacitor 53 and an amplifier 54 with the control electro nik 45 connected. To limit the voltage, a series circuit comprising a zener diode 55 and a blocking diode 56 is arranged between the two output terminals 41, 42, the forward direction of the zener diode 55 being directed towards the second output terminal 42 and the forward direction of the blocking diode 56 towards the first output terminal 41.
Trifft im Zeitpunkt ty die Ventilnadel 20 bzw. dieMeets the valve needle 20 or at the time ty
Ankerplatte 26 auf die piezokeramische Scheibe 47 am Anschlag 48 auf, so werden durch diesen Aufschlag in der Scheibe 47 Ladungen erzeugt, die in den parasitären Kapazitäten von Diode 50, Transistorendstufe 44 und Verbindungskabel 34 mit seinen beiden Leitungen 48,42 zu einem Spannungsimpuls führen. Der Verlauf der Spannung an der zweiten Ausgangsklemme 42 ist im Diagramm d in Fig. 3 oben und am Ausgang des Verstärkers 54 bzw. am Eingang 57 der Steuerelektronik 45 im Diagramm d der Fig. 3 unten dargestellt. Deutlich ist der Spannungsimpuls im Zeitpunkt tQ beim Öffnen der Transistorendstufe 44 zu sehen, der durch die Wicklungsinduktivität der Magnetspule 24 hervorgerufen wird. Dieser Spannungsimpuls klingt rasch ab, und zwar noch bevor die Ventilnadel 20 auf dem_ Anschlag 28 auftrifft. Der Aufprall der Ventilnadel 20 löst den bereits beschriebenen zweiten Spannungsimpuls im Zeitpunkt ty aus, der das Ventiloffensignal für die Steuerelektronik 25 darstellt. Nach Differenzierung der Spannung an der Ausgangsklemme 42 mittels des Kondensators 53 und Verstärken erhält man amArmature plate 26 on the piezoceramic disk 47 at the stop 48, charges are generated by this impact in the disk 47, which lead to a voltage pulse in the parasitic capacitances of diode 50, transistor output stage 44 and connecting cable 34 with its two lines 48, 42. The curve of the voltage at the second output terminal 42 is at the top in diagram d in FIG. 3 and at the output of the amplifier 54 or at the input 57 of the control electronics 45 in diagram d of FIG. 3 below shown. The voltage pulse at time t Q when transistor output stage 44 is opened, which is caused by the winding inductance of magnet coil 24, can be clearly seen. This voltage pulse subsides quickly, even before the valve needle 20 hits the stop 28. The impact of valve needle 20 triggers the already described second voltage pulse at time ty, which represents the valve open signal for control electronics 25. After differentiating the voltage at the output terminal 42 by means of the capacitor 53 and amplifying, one obtains on
Eingang 57 der Steuerelektronik 45 (den in Diagramm d)' der Fig. 3 unten dargestellten Spannungsverlauf. Der zweite Höcker ist das Ventiloffensignal. Input 57 of control electronics 45 (the voltage curve shown in diagram d) ' of FIG. 3 below. The second bump is the valve open signal.

Claims

Ansprüche Expectations
1. Magnetventil, insbesondere für Kraftstoffeinspritzpumpen von Brennkraftmaschinen, mit einer zwischen Ventileinlaß und Ventilauslaß angeordneten Ventilöffnung, die von einem Ventilsitz umgeben ist, mit einer mit dem1. Solenoid valve, in particular for fuel injection pumps of internal combustion engines, with a valve opening arranged between the valve inlet and valve outlet, which is surrounded by a valve seat, with one with the
Ventilsitz zum Schließen und Freigeben der Ventilöffnung zusammenwirkenden Ventilnadel, die in der Ventilschließstellung auf dem Ventilsitz aufsitzt und in der Ventiloffenstellung unter der Wirkung einer Ventilöffnungsfeder an einem Hubanschlag anliegt, mit einem die Ventilnadel in Schließrichtung antreibenden Elektromagneten, der eine Erregerwicklung mit Wicklungsanschlüssen aufweist,- mit einer zwei Ausgangsklemmen aufweisenden Steuereinrichtung zur Ansteuerung der Erregerwicklung, deren Ausgangs lemmen über ein aus einer Zuführ- und einer Rückführleitung bestehendes Verbindungskabel mit den beiden Wicklungsanschlüssen der Erregerwicklung verbunden ist, und mit einem Schaltstellungsgeber zur Detektion der Ventilnadelstellung, der eine am Hubanschlag im Hubweg der Ventilnadel angeordnete Piezokeramik aufweist, deren elektrisches Ausgangssignal als Ventiloffensignal der Steuereinrichtung zugeführt ist, dadurch gekennzeichnet, daß die mit der ZufUhrleitung (48) verbundene ersteValve seat for closing and releasing the valve opening interacting valve needle, which is seated on the valve seat in the valve closing position and is in contact with a stroke stop in the valve open position under the action of a valve opening spring, with an electromagnet driving the valve needle in the closing direction, which has an excitation winding with winding connections, with a control device having two output terminals for controlling the excitation winding, the output terminals of which are connected to the two winding connections of the excitation winding via a connecting cable consisting of a supply and a return line, and with a switch position detector for detecting the Valve needle position, which has a piezoceramic arranged at the stroke stop in the stroke of the valve needle, the electrical output signal of which is fed to the control device as a valve open signal, characterized in that the first one connected to the feed line (48)
Ausgangsklemme (41) der Steuereinrichtung (40) an einem Gleichspannungspotential (39) und die mit der Rückführleitung (49) verbundene zweite Ausgangsklemme (42) der Steuereinrichtung (40) über ein Schaltelement , vorzugsweise einen Endstufentransistor (44), an Masse bzw. Nullpotential liegt, daß zwischen dem erregerwicklungsseitigen Anschluß (35) der Zuführleitung (48) und dem Wicklungsanschluß (37) der Erregerwicklung (24) eine Diode (50) mit zur Erregerwicklung (24) weisender Durchflußrichtung eingeschaltet ist, daß der höheres Potential führende elektrische Ausgang (51) der Piezokeramik (47) an dem mit der Rückführleitung (49) verbundenen Wicklungsanschluß (38) der Erregerwicklung (24) angeschlossen ist, daß der andere elektrische Ausgang (52) der Piezokeramik (47) an dem erregerwicklungsseitigen Anschluß (35) der Zu ührleitung (48) oder an Masse bzw. Nullpotential angeschlossen ist und daß das Ventiloffensignal an der mit der Rückführleitung (49) verbundenen zweiten Ausgangsklemme (42) der Steuereinrichtung (40) mittel- oder unmittelbar abgenommen ist.Output terminal (41) of the control device (40) at a DC voltage potential (39) and the second output terminal (42) of the control device (40) connected to the return line (49) via a switching element, preferably an output stage transistor (44), to ground or zero potential is that between the excitation winding-side connection (35) of the feed line (48) and the winding connection (37) of the excitation winding (24) a diode (50) with the flow direction pointing to the excitation winding (24) is switched on, that the higher potential leading electrical output ( 51) of the piezoceramic (47) is connected to the winding connection (38) of the excitation winding (24) connected to the return line (49), that the other electrical output (52) of the piezoceramic (47) is connected to the excitation winding-side connection (35) of the Guide line (48) or connected to ground or zero potential and that the valve open signal on the connected to the return line (49) two iten output terminal (42) of the control device (40) is removed directly or indirectly.
2.. Magnetventil nach Anspruch 1, dadurch gekennzeichnet, daß zwischen der zweiten Ausgangsklemme (42) der Steuereinrichtung (40) und der Abnahmestelle (57). des Ventiloffensignals ein Kondensator (53) eingeschaltet ist. 2 .. Solenoid valve according to claim 1, characterized in that between the second output terminal (42) of the control device (40) and the removal point (57). of the valve open signal, a capacitor (53) is switched on.
EP89911988A 1988-11-15 1989-11-03 Solenoid valve, in particular for fuel injection pumps Expired - Lifetime EP0444055B1 (en)

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DE3838599 1988-11-15
DE19883838599 DE3838599A1 (en) 1988-11-15 1988-11-15 SOLENOID VALVE, ESPECIALLY FOR FUEL INJECTION PUMPS

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EP0444055B1 EP0444055B1 (en) 1993-03-03

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US5109885A (en) 1992-05-05
WO1990005845A1 (en) 1990-05-31
JPH04501754A (en) 1992-03-26
DE3838599A1 (en) 1990-05-17
DE58903687D1 (en) 1993-04-08
EP0444055B1 (en) 1993-03-03

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