EP0408963A2 - Method for controlling the armature movement of switching magnets - Google Patents

Method for controlling the armature movement of switching magnets Download PDF

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Publication number
EP0408963A2
EP0408963A2 EP90112572A EP90112572A EP0408963A2 EP 0408963 A2 EP0408963 A2 EP 0408963A2 EP 90112572 A EP90112572 A EP 90112572A EP 90112572 A EP90112572 A EP 90112572A EP 0408963 A2 EP0408963 A2 EP 0408963A2
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EP
European Patent Office
Prior art keywords
electromagnet
coil current
impact
pole face
armature
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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
EP90112572A
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German (de)
French (fr)
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EP0408963B1 (en
EP0408963A3 (en
Inventor
Günter Dr.-Ing. Schmitz
Ekkehard Dr.-Ing. Schrey
Paul Dipl.-Ing. Uitenbroek
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FEV Europe GmbH
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FEV Motorentechnik GmbH and Co KG
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Publication of EP0408963A3 publication Critical patent/EP0408963A3/en
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    • 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
    • H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
    • H01F7/1844—Monitoring or fail-safe circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means

Definitions

  • the invention relates to a method for controlling the armature movement of switching magnets, in particular electromagnets for actuators of internal combustion engines.
  • an adaptable control for the inflow and outflow of the working medium is required in order to be able to optimally influence the working process in accordance with the aspects required in each case.
  • the course of the control has a great influence on various parameters, for example the states of the working medium before, in and after the working area, the working frequency and the processes in the working area.
  • the need for adaptable control is particularly given in internal combustion engines, since they work transiently in very different operating states and a correspondingly variable positive control of the gas exchange valves is advantageous.
  • a major problem with electromagnetic controls of this type is to apply the high electromagnetic forces required to actuate the armature connected to the actuator. This leads to a ver relatively high energy consumption and also at an undesirable cost of materials.
  • the invention therefore aims to reduce the energy consumption or the current consumption in switching magnet arrangements of the type described and, accordingly, to achieve material savings.
  • the coil current of the electromagnet is regulated linearly before the expected impact of the magnet armature on the pole face.
  • the coil current of the electromagnet is determined by a two-point control (clocking) before and / or after the magnet armature strikes the pole face of the electromagnet.
  • the coil current of the electromagnet first increases in an unregulated manner up to the value I0 after switching on and then a two-point control (clocking) takes place.
  • the coil current of the electromagnet first increases uncontrolled up to the value I0 after switching on and that a linear regulation then takes place.
  • a constant current can be applied to the electromagnet to determine the impingement of the magnet armature on the pole face, and the point of impingement is then determined as a change in the voltage across the magnet coil.
  • the coil current can be determined again by a two-point control (clocking) after a predetermined time has elapsed after the magnet armature strikes the pole face.
  • electromagnets with soft iron cores instead of electromagnets with soft iron cores, electromagnets with armatures and / or cores made of permanent magnetic material are used additionally or exclusively.
  • a magnet coil 1 of a switching magnet which is connected in parallel with a freewheeling branch indicated by a diode 2, is connected on the one hand to a voltage source 6 and on the other hand to an output stage indicated by a transistor 3.
  • a circuit 5 is also connected to the magnet coil 1, which detects the impact of the magnet armature on the pole face of the electromagnet.
  • the circuit 5 is in turn connected to an output stage control 4, which can, for example, control the coil, as shown in FIG. 2.
  • the current in the coil of the electromagnet initially rises unregulated to the value I0 after switching on on, because the output stage control 4 ensures that the current is switched through in the period from A to B.
  • the current is clocked in the period from B to C between the values I1 and I2.
  • a switchover to linear control takes place, at which the current has the value I3.
  • the circuit 5 is activated in order to detect the impact of the magnet armature on the pole face in the manner indicated.
  • time D which can be the time of impact
  • time E it can be switched back to clocking until E again. It is also possible for the changeover to take place after a predetermined time has elapsed.
  • time E the system is switched off until another working period.
  • the invention offers particular advantages when actuating electromagnets, in particular for actuators on internal combustion engines, in which the time at which the armature strikes is to be detected in order to be able to compensate for influences in production, temperature, supply voltage or the like.
  • the detection of the armature impact usually occurs by evaluating the current dip that occurs when the armature approaches the magnets. However, this requires that the current is essentially only determined by inductance, coil resistance and supply voltage. The current, however, may then rise to values that are actually not necessary for the operation of the actuator.
  • these unnecessarily high currents and thus energy consumption are avoided by limiting the current to a height I0 and regulating it via an energy-saving two-point control (clocking and free-running). Because accurate detection of the When the anchor strike time is extremely difficult, a linear current phase is inserted in the time range of the anchor strike. During this time, the exact time of impact can be identified by evaluating the electrical voltage across the magnetic coil. After detection of the impact, it is possible to switch back to an energy-optimal 2-point control.
  • the main advantage is a particularly energy-saving control, whereby supply voltage compensation and temperature compensation are not necessary.
  • the application of the invention is not limited to electromagnets with soft iron cores, since the use of electromagnets with armatures and / or cores made of permanent magnetic material can also offer advantages.
  • the armature When using permanent magnetic armatures and / or cores, the armature is detached from the pole surface by applying a short countercurrent.
  • the permanent magnet In order to support the tightening process, the permanent magnet generally has to be additionally magnetized; this is done in the same way as for magnets with soft iron core.

Abstract

In a method for controlling the armature movement of a switching magnet, in particular of electromagnets for actuators of internal-combustion engines, it is intended to reduce considerably the energy and material consumption. This is achieved in that the coil current of the electromagnet is linearly regulated before the expected impact of the magnetic armature on the pole surface. The impact of the magnetic armature on the pole surface of the electromagnet preferably occurs in this case during the linear regulation. <IMAGE>

Description

Die Erfindung bezieht sich auf ein Verfahren zur Steuerung der Ankerbewegung von Schaltmagneten, insbesondere von Elektromag­neten für Stellglieder von Brennkraftmaschinen.The invention relates to a method for controlling the armature movement of switching magnets, in particular electromagnets for actuators of internal combustion engines.

Bei Verdrängungsmaschinen ist eine anpassungsfähige Steuerung zum Ein- und Ausströmen des Arbeitsmediums erforderlich, um den Ar­beitsprozeß nach den jeweilig erforderlichen Gesichtspunkten optimal beeinflussen zu können. Der Ablauf der Steuerung hat da­bei großen Einfluß auf verschiedene Parameter, beispielsweise die Zustände des Arbeitsmediums vor, im und nach dem Arbeitsraum, die Arbeitsfrequenz und die Vorgänge im Arbeitsraum. Die Notwendig­keit einer anpassungsfähigen Steuerung ist insbesondere bei Brennkraftmaschinen gegeben, da sie bei sehr unterschiedlichen Betriebszuständen instationär arbeiten und eine entsprechend variable Zwangssteuerung der Gaswechselventile vorteilhaft ist.In the case of displacement machines, an adaptable control for the inflow and outflow of the working medium is required in order to be able to optimally influence the working process in accordance with the aspects required in each case. The course of the control has a great influence on various parameters, for example the states of the working medium before, in and after the working area, the working frequency and the processes in the working area. The need for adaptable control is particularly given in internal combustion engines, since they work transiently in very different operating states and a correspondingly variable positive control of the gas exchange valves is advantageous.

Zur Steuerung der Gaswechselventile in Brennkraftmaschinen wur­den bisher im wesentlichen Nockenwellen verwendet. Eine variable Steuerung ist hier nur mit sehr hohem technischen Aufwand mög­lich. Daneben sind elektromagnetische Steuerungen von Gaswech­selventilen an Brennkraftmaschinen bekannt geworden, bei denen die Schließkraft auf das Gaswechselventil von einer Feder aufge­bracht wird, während die Öffnungskräfte von einem entsprechend angesteuerten Elektromagneten erzeugt werden, wie es beispiels­weise in DE-OS 20 63 158 beschrieben ist.To control the gas exchange valves in internal combustion engines, camshafts have hitherto been used essentially. Variable control is only possible with very high technical effort. In addition, electromagnetic controls of gas exchange valves on internal combustion engines have become known in which the closing force is applied to the gas exchange valve by a spring, while the opening forces are generated by a correspondingly controlled electromagnet, as described, for example, in DE-OS 20 63 158.

Bei elektromagnetischen Steuerungen dieser Art ist ein wesent­liches Problem, die erforderlichen hohen elektromagnetischen Kräfte aufzubringen, die erforderlich sind für die Betätigung des mit dem Stellglied verbundenen Ankers. Dies führt zu einem ver­ hältnismäßig hohen Energieverbrauch und auch zu einem unerwünsch­ten Materialaufwand.A major problem with electromagnetic controls of this type is to apply the high electromagnetic forces required to actuate the armature connected to the actuator. This leads to a ver relatively high energy consumption and also at an undesirable cost of materials.

Die Erfindung bezweckt daher, bei Schaltmagnetanordnungen der be­schriebenen Art den Energieverbrauch bzw. den Stromverbrauch her­abzusetzen und dementsprechend auch eine Materialersparnis zu er­reichen.The invention therefore aims to reduce the energy consumption or the current consumption in switching magnet arrangements of the type described and, accordingly, to achieve material savings.

Zu diesem Zweck ist gemäß der Erfindung vorgesehen, daß der Spu­lenstrom des Elektromagneten vor dem erwarteten Auftreffen des Magnetankers auf der Polfläche linear geregelt wird.For this purpose it is provided according to the invention that the coil current of the electromagnet is regulated linearly before the expected impact of the magnet armature on the pole face.

Dabei ist es zweckmäßig, daß das Auftreffen des Magnetankers auf der Polfläche des Elektromagneten während der linearen Regelung erfolgt.It is expedient for the armature to strike the pole face of the electromagnet during linear control.

Besondere Vorteile sind erreichbar, wenn der Spulenstrom des Elektromagneten vor und/oder nach dem Auftreffen des Magnetan­kers auf der Polfläche des Elektromagneten durch eine Zweipunkt­regelung (Taktung) bestimmt wird.Particular advantages can be achieved if the coil current of the electromagnet is determined by a two-point control (clocking) before and / or after the magnet armature strikes the pole face of the electromagnet.

Nach einem weiteren vorteilhaften Merkmal ist vorgesehen, daß der Spulenstrom des Elektromagneten nach dem Einschalten zunächst ungeregelt bis zum Wert I0 ansteigt und anschließend eine Zwei­punktregelung (Taktung) erfolgt.According to a further advantageous feature, it is provided that the coil current of the electromagnet first increases in an unregulated manner up to the value I0 after switching on and then a two-point control (clocking) takes place.

Auch kann es zweckmäßig sein, daß der Spulenstrom des Elektromag­neten nach dem Einschalten zunächst ungeregelt bis zum Wert I0 ansteigt und anschließend eine Linearregelung erfolgt.It may also be expedient that the coil current of the electromagnet first increases uncontrolled up to the value I0 after switching on and that a linear regulation then takes place.

Der Elektromagnet kann dabei zur Feststellung des Auftreffens des Magnetankers auf der Polfläche mit einem konstanten Strom beauf­schlagt werden, und der Auftreffzeitpunkt wird dann als Änderung der Spannung über der Magnetspule festgestellt.A constant current can be applied to the electromagnet to determine the impingement of the magnet armature on the pole face, and the point of impingement is then determined as a change in the voltage across the magnet coil.

Gemäß einem weiteren vorteilhaften Merkmal kann der Spulenstrom nach Ablauf einer vorgegebenen Zeit nach dem Auftreffen des Mag­netankers auf der Polfläche wieder durch eine Zweipunktregelung (Taktung) bestimmt werden.According to a further advantageous feature, the coil current can be determined again by a two-point control (clocking) after a predetermined time has elapsed after the magnet armature strikes the pole face.

Auch kann es Vorteile bieten, daß eine Umschaltung auf die Bestim­mung des Spulenstromes durch Zweipunktregelung (Taktung) durch die Feststellung des Auftreffens des Magnetankers auf der Polf­läche ausgelöst wird.There can also be advantages that a switchover to the determination of the coil current by two-point control (clocking) is triggered by the detection of the impact of the magnet armature on the pole face.

Weiterhin kann es zweckmäßig sein, daß anstelle von Elektromagne­ten mit Weicheisenkern zusätzlich oder ausschließlich Elektromag­nete mit Ankern und/oder Kernen aus permanentmagnetischem Materi­al verwendet werden.Furthermore, it may be expedient that, instead of electromagnets with soft iron cores, electromagnets with armatures and / or cores made of permanent magnetic material are used additionally or exclusively.

Ausführungsbeispiele der Erfindung werden nachfolgend anhand der Zeichnungen näher beschrieben.

  • Fig. 1 zeigt eine Schaltung zur Durchführung des Verfahrens.
  • Fig. 2 zeigt den Stromverlauf in Abhängigkeit von der Zeit wäh­rend einer Schaltperiode.
Embodiments of the invention are described below with reference to the drawings.
  • Fig. 1 shows a circuit for performing the method.
  • 2 shows the current profile as a function of time during a switching period.

Wie Fig. 1 zeigt, ist eine Magnetspule 1 eines Schaltmagneten, der ein durch eine Diode 2 angedeuteter Freilaufzweig parallel geschaltet ist, einerseits mit einer Spannunsquelle 6 und ande­rerseits mit einer durch einen Transistor 3 angedeuteten End­stufe verbunden. Mit der Magnetspule 1 ist auch eine Schaltung 5 verbunden, welche das Auftreffen des Magnetankers auf der Pol­fläche des Elektromagneten detektiert. Die Schaltung 5 ist ihrer­seits mit einer Endstufenansteuerung 4 verbunden, welche bei­spielsweise eine Ansteuerung der Spule bewirken kann, wie sie in Fig. 2 dargestellt ist.As shown in FIG. 1, a magnet coil 1 of a switching magnet, which is connected in parallel with a freewheeling branch indicated by a diode 2, is connected on the one hand to a voltage source 6 and on the other hand to an output stage indicated by a transistor 3. A circuit 5 is also connected to the magnet coil 1, which detects the impact of the magnet armature on the pole face of the electromagnet. The circuit 5 is in turn connected to an output stage control 4, which can, for example, control the coil, as shown in FIG. 2.

Wie Fig. 2 zeigt, steigt der Strom in der Spule des Elektromag­neten nach dem Einschalten zunächst ungeregelt auf den Wert I0 an, da die Endstufenansteuerung 4 dafür sorgt, daß der Strom in dem Zeitraum von A bis B voll durchgeschaltet wird.As shown in FIG. 2, the current in the coil of the electromagnet initially rises unregulated to the value I0 after switching on on, because the output stage control 4 ensures that the current is switched through in the period from A to B.

Nach Erreichen des Wertes I0 wird der Strom in dem Zeitraum von B bis C zwischen den Werten I1 und I2 getaktet. In dem vorgegebenen Zeitpunkt C, der vor dem Auftreffen des Magnetankers auf der Pol­fläche liegt, erfolgt eine Umschaltung auf Linearregelung, bei der der Strom den Wert I3 hat. In der Zeit der Linearregelung von C bis D ist die Schaltung 5 aktivierte um das Auftreffen des Mag­netankers auf die Polfläche in der angegebenen Weise zu detektie­ren.After reaching the value I0, the current is clocked in the period from B to C between the values I1 and I2. At the predetermined point in time C, which is before the magnet armature hits the pole face, a switchover to linear control takes place, at which the current has the value I3. During the time of the linear control from C to D, the circuit 5 is activated in order to detect the impact of the magnet armature on the pole face in the manner indicated.

Anschließend kann im Zeitpunkt D, der der Zeitpunkt des Auftref­fens sein kann, wieder bis E auf Taktung umgeschaltet werden. Auch ist es möglich, daß die Umschaltung nach Ablauf einer vorge­gebenen Zeit nach dem Auftreffen erfolgt. Im Zeitpunkt E wird bis zu einer weiteren Arbeitsperiode abgeschaltet.Then, at time D, which can be the time of impact, it can be switched back to clocking until E again. It is also possible for the changeover to take place after a predetermined time has elapsed. At time E, the system is switched off until another working period.

Die Erfindung bietet besondere Vorteile beim Ansteuern von Elek­tromagneten, insbesondere für Stellglieder an Brennkraftmaschi­nen, bei denen der Zeitpunkt des Ankerauftreffens detektiert wer­den soll, um Einflüsse der Fertigung, Temperatur, Versorgungs­spannung o. dgl. ausgleichen zu können.The invention offers particular advantages when actuating electromagnets, in particular for actuators on internal combustion engines, in which the time at which the armature strikes is to be detected in order to be able to compensate for influences in production, temperature, supply voltage or the like.

Üblicherweise geschieht die Detektierung des Ankerauftreffens durch Auswertung des Stromeinbruchs, der bei Annähern des Ankers an den Magneten auftritt. Dazu ist es jedoch erforderlich, daß der Strom im wesentlichen nur durch Induktivität, Spulenwider­stand und Versorgungsspannung bestimmt wird. Der Strom, steigt dann jedoch möglicherweise auf Werte, die für den Betrieb des Stellgliedes eigentlich nicht notwendig sind.The detection of the armature impact usually occurs by evaluating the current dip that occurs when the armature approaches the magnets. However, this requires that the current is essentially only determined by inductance, coil resistance and supply voltage. The current, however, may then rise to values that are actually not necessary for the operation of the actuator.

Diese unnötig hohen Ströme und damit Energieverbräuche werden er­findungsgemäß dadurch umgangen, daß der Strom auf eine Höhe I0 begrenzt wird und über eine energiesparende 2-Punktregelung (Tak­tung und Freilauf) geregelt wird. Da eine genaue Detektion des Ankerauftreffzeitpunktes während der Taktpause äußerst schwierig ist, wird in dem Zeitbereich des Ankerauftreffens eine Linear­stromphase eingefügt. Während dieser Zeit ist eine Erkennung des genauen Auftreffzeitpunktes durch Auswertung der elektrischen Spannung über der Magnetspule möglich. Nach Detektion des Auf­treffens kann wieder auf eine energieoptimale 2-Punkt-Regelung umgeschaltet werden.According to the invention, these unnecessarily high currents and thus energy consumption are avoided by limiting the current to a height I0 and regulating it via an energy-saving two-point control (clocking and free-running). Because accurate detection of the When the anchor strike time is extremely difficult, a linear current phase is inserted in the time range of the anchor strike. During this time, the exact time of impact can be identified by evaluating the electrical voltage across the magnetic coil. After detection of the impact, it is possible to switch back to an energy-optimal 2-point control.

Der wesentliche Vorteil ist eine besonders energiesparende Steu­erung, wobei eine Versorgungsspannungskompensation ebenso wie eine Temperaturkompensation nicht erforderlich ist.The main advantage is a particularly energy-saving control, whereby supply voltage compensation and temperature compensation are not necessary.

Wie bereits erwähnt wurde, ist die Anwendung der Erfindung nicht auf Elektromagnete mit Weicheisenkern beschränkt, da auch der Einsatz von Elektromagneten mit Ankern und/oder Kernen aus per­manentmagnetischem Material Vorteile bieten kann.As already mentioned, the application of the invention is not limited to electromagnets with soft iron cores, since the use of electromagnets with armatures and / or cores made of permanent magnetic material can also offer advantages.

Bei Verwendung von permanentmagnetischen Ankern und/oder Kernen erfolgt das Ablösen des Ankers von der Polfläche durch Aufprägen eines kurzen Gegenstromes. Zum Unterstützen des Anzugsvorganges muß der Permanentmagnet im allgemeinen zusätzlich magnetisiert werden; dies erfolgt in gleicher Weise wie bei Magneten mit Weicheisenkern.When using permanent magnetic armatures and / or cores, the armature is detached from the pole surface by applying a short countercurrent. In order to support the tightening process, the permanent magnet generally has to be additionally magnetized; this is done in the same way as for magnets with soft iron core.

Claims (10)

1. Verfahren zur Steuerung der Ankerbewegung eines Schaltmagne­ten, insbesondere von Elektromagneten für Stellglieder von Brenn­kraftmaschinen, dadurch gekennzeichnet, daß der Spulenstrom des Elektromagneten vor dem erwarteten Auftreffen des Magnetankers auf der Polfläche linear geregelt wird.1. A method for controlling the armature movement of a switching magnet, in particular electromagnets for actuators of internal combustion engines, characterized in that the coil current of the electromagnet is regulated linearly before the expected impact of the magnet armature on the pole face. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Auftreffen des Magnetankers auf der Polfläche des Elektromagne­ten während der linearen Regelung erfolgt.2. The method according to claim 1, characterized in that the impact of the armature on the pole face of the electromagnet takes place during the linear control. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Spulenstrom des Elektromagneten vor und/oder nach dem Auf­treffen des Magnetankers auf der Polfläche des Elektromagneten durch eine Zweipunktregelung (Taktung) bestimmt wird.3. The method according to claim 1 or 2, characterized in that the coil current of the electromagnet is determined before and / or after the impingement of the magnet armature on the pole face of the electromagnet by a two-point control (clocking). 4. Verfahren nach einem der Ansprüche 1-3, dadurch gekennzeich­net, daß der Anstieg des Spulenstroms des Elektromagneten auf einen maximalen Wert I0 begrenzt wird.4. The method according to any one of claims 1-3, characterized in that the increase in the coil current of the electromagnet is limited to a maximum value I0. 5. Verfahren nach einem der Ansprüche 1-4, dadurch gekennzeich­net, daß der Spulenstrom des Elektromagneten nach dem Einschal­ten zunächst ungeregelt bis zum Wert I0 ansteigt und anschließend eine Zweipunktregelung (Taktung) erfolgt.5. The method according to any one of claims 1-4, characterized in that the coil current of the electromagnet initially increases unregulated after switching on up to the value I0 and then a two-point control (clocking) takes place. 6. Verfahren nach einem der Ansprüche 1-4, dadurch gekennzeich­net, daß der Spulenstrom des Elektromagneten nach dem Einschalten zunächst ungeregelt bis zum Wert I0 ansteigt und anschließend eine Linearregelung erfolgt.6. The method according to any one of claims 1-4, characterized in that the coil current of the electromagnet initially increases unregulated after switching on to the value I0 and then a linear control takes place. 7. Verfahren nach einem der Ansprüche 1-6, dadurch gekennzeich­net, daß der Elektromagnet zur Feststellung des Auftreffens des Magnetankers auf der Polfläche mit einem konstanten Strom beauf­ schlagt wird und der Auftreffzeitpunkt als Änderung der Spannung über der Magnetspule festgestellt wird.7. The method according to any one of claims 1-6, characterized in that the electromagnet to determine the impact of the magnet armature on the pole face with a constant current is struck and the time of impact is determined as a change in the voltage across the solenoid. 8. Verfahren nach einem der Ansprüche 1-7, dadurch gekennzeich­net, daß der Spulenstrom des Elektromagneten nach Ablauf einer vorgegebenen Zeit nach dem Auftreffen des Magnetankers auf der Polfläche wieder durch eine Zweipunktregelung (Taktung) bestimmt wird.8. The method according to any one of claims 1-7, characterized in that the coil current of the electromagnet is determined again by a two-point control (clocking) after a predetermined time after the magnet armature strikes the pole face. 9. Verfahren nach einem der Ansprüche 1-8, dadurch gekennzeich­net, daß eine Umschaltung auf die Bestimmung des Spulenstromes des Elektromagneten durch Zweipunktregelung (Taktung) durch die Feststellung des Auftreffens des Magnetankers auf der Polfläche ausgelöst wird.9. The method according to any one of claims 1-8, characterized in that a switchover to the determination of the coil current of the electromagnet by two-point control (clocking) is triggered by the detection of the impact of the magnet armature on the pole face. 10. Verfahren nach einem der Ansprüche 1-9, dadurch gekennzeich­net, daß anstelle von Elektromagneten mit Weicheisenkern zusätz­lich oder ausschließlich Elektromagnete mit Ankern und/oder Ker­nen aus permanentmagnetischem Material verwendet werden.10. The method according to any one of claims 1-9, characterized in that instead of electromagnets with soft iron core additionally or exclusively electromagnets with anchors and / or cores made of permanent magnetic material are used.
EP90112572A 1989-07-15 1990-07-02 Method for controlling the armature movement of switching magnets Expired - Lifetime EP0408963B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3923477A DE3923477A1 (en) 1989-07-15 1989-07-15 METHOD FOR CONTROLLING THE ANCHOR MOTION OF SHIFTING MAGNETS
DE3923477 1989-07-15

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EP0408963A2 true EP0408963A2 (en) 1991-01-23
EP0408963A3 EP0408963A3 (en) 1991-11-27
EP0408963B1 EP0408963B1 (en) 1996-03-27

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GB2279829A (en) * 1993-07-03 1995-01-11 Bosch Gmbh Robert Method of and equipment for determining a control parameter for an electromagnetic device
EP0727566A2 (en) * 1995-02-15 1996-08-21 Toyota Jidosha Kabushiki Kaisha A valve driving apparatus using an electromagnetic coil to move a valve body with reduced noise
EP1001142A2 (en) * 1998-11-16 2000-05-17 DaimlerChrysler AG Method of operation for an electromagnetically driven valve actuator
WO2013178367A3 (en) * 2012-05-31 2014-01-23 Avl Deutschland Gmbh Method and device for monitoring an actuator device

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GB2279829B (en) * 1993-07-03 1998-01-21 Bosch Gmbh Robert Method of and equipment for determining a control parameter for an electromagnetic device
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DE3923477A1 (en) 1991-01-24
EP0408963B1 (en) 1996-03-27
EP0408963A3 (en) 1991-11-27
DE59010231D1 (en) 1996-05-02

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