WO2005041223A1 - Electromagnet - Google Patents
Electromagnet Download PDFInfo
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- WO2005041223A1 WO2005041223A1 PCT/EP2004/052569 EP2004052569W WO2005041223A1 WO 2005041223 A1 WO2005041223 A1 WO 2005041223A1 EP 2004052569 W EP2004052569 W EP 2004052569W WO 2005041223 A1 WO2005041223 A1 WO 2005041223A1
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- Prior art keywords
- valve
- partial coils
- coil
- electromagnet
- electromagnet according
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- 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
- F02M51/0617—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature having two or more electromagnets
- F02M51/0621—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature having two or more electromagnets acting on one mobile armature
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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
- H01F7/16—Rectilinearly-movable armatures
- H01F7/1607—Armatures entering the winding
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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
- H01F7/16—Rectilinearly-movable armatures
- H01F2007/1692—Electromagnets or actuators with two coils
-
- 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
Definitions
- the invention is based on an electromagnet according to the preamble of claim 1.
- Electromagnets are used in injectors for; Internal combustion engines are used as actuators or actuators for actuating the valve needle. With a known
- Injection valve (DE 199 07 899 AI) a coil space is formed in a valve housing, in which the hollow cylindrical magnet coil is inserted, which is wound on a coil carrier.
- An iron core is arranged in a central through hole in the coil carrier and an armature of the electromagnet is axially displaceably guided.
- the armature is firmly connected to a valve needle.
- the valve needle is pressed open by a valve closing spring with an end closing head on a valve seat formed in a valve body, which surrounds a valve opening.
- the electromagnet according to the invention with the features of claim 1 has the advantage that the permissible minimum DC operating voltage of the electromagnet can be significantly reduced by the composition of the magnet coil, which is to be provided for generating a flow necessary for a desired magnetic force, from partial coils connected in parallel. This means that the electromagnet can now also be used where previously the minimum operating voltage required for the electromagnet to function properly could not be achieved. With Injection valves equipped with the electromagnet according to the invention can thus be operated without problems even at higher system pressure in vehicle electrical systems with a low on-board voltage, for example 12 V. For example, a magnet coil with the number of turns w and an ohmic
- Resistor R would be divided into three equal sub-coils, each with a third of the number of turns w and a third of the ohmic resistance R, the minimum permissible operating voltage would drop to a third of the operating voltage U B and the electromagnet would generate the same magnetic force.
- FIG. 1 shows a longitudinal section of an electromagnetically actuated injection valve
- FIG. 2 shows a circuit diagram of a magnet coil of the electromagnet in FIG. 1
- Fig. 3 is a circuit diagram of a solenoid of the electromagnet according to the prior art.
- the injection valve shown in longitudinal section in FIG. 1 is particularly suitable for injecting fuel directly into a combustion chamber (not shown) of an internal combustion engine in vehicles.
- the injection valve can be designed as an injection valve opening inwards or outwards. In the example of FIG. 1, it is an injection valve that opens inwards.
- the injection valve has a valve housing 11 into which, on the one hand, an elongated, hollow-cylindrical one
- Valve body 12 and on the other hand, a hollow cylindrical fuel inlet connector are used coaxially to the housing axis.
- the valve body 12 is closed at the end with a valve seat body 14, in which a valve seat 16 surrounding a valve opening 15 is formed.
- a valve needle 17 is guided axially displaceably in the valve body 12 and carries a closing body 18 at the end, which is pressed onto the valve seat 16 by a valve closing spring 19 when the injection valve is closed.
- the valve is opened by means of an actuator 20, which engages the valve needle 17 and displaces it against the force of the valve closing spring 19, so that the closing body 18 lifts off the valve seat 16 and, over a predetermined cross section of the valve opening 15, a predetermined amount of fuel from the valve opening 15 in Inside the valve body 12 upstream, under system pressure fuel is injected.
- the actuator 20 is designed as an electromagnet, the magnet coil 22 of which is accommodated in a coil space 23 formed in the valve housing 11.
- the magnet coil 22 is usually wound on a hollow cylindrical coil carrier, which has two end flanges.
- the coil space 23 is arranged in the valve housing 11 in such a way that the fuel inlet connector 13 partially projects into the interior of the coil carrier 24 and here forms the iron core of the magnetic circuit of the electromagnet.
- the free end face of the fuel inlet connector 13 is upstream in the valve housing 11
- Armature 25 of the electromagnet is axially displaceably guided, which partially projects into the coil carrier 24 to such an extent that when the injection valve is closed under the action of the valve closing spring 19, an air gap remains between the armature 25 and the end face of the iron core.
- the armature 25 provided with through holes 21 for the force flow is firmly connected to the valve needle 17, and the valve closing spring 19 designed as a compression spring is supported on the one hand on the armature 25 and on the other hand in the interior of the fuel inlet connection 13.
- the solenoid 22 is connected to a DC voltage.
- the flux ⁇ is calculated from the current I flowing through the magnet coil 22 and the number of turns w of the magnet coil 22
- the magnetic coil 22 has a plurality of partial coils which are connected in parallel with one another.
- the number of turns w of the magnetic coil 22 is divided, for example, into two sub-coils 221, 222, the sub-coils with aligned coil axes being arranged in the unchanged coil space 23. Since the magnet coil 22 is divided in terms of its number of turns, the winding wires of the partial coils 221, 222 naturally have the same specific ohmic resistance and the same wire cross section. Likewise, both sub-coils 221, 222 have the same coil diameter. As shown in the circuit diagram in FIG.
- the two partial coils 221, 222 are connected in parallel and can be connected via an electronic switch 26 to a DC voltage source 27, the minimum operating voltage of which is U B / 2.
- FIG. 3 the circuit diagram for an undivided magnetic coil of a conventional electromagnet is shown for comparison, which is connected via an electronic switch to a DC voltage source, the permissible minimum operating voltage of which is U B.
- Eq. (3) in Eq. (2) inserted results in a flooding according to Eq. (4) to: w (4) R
- the current I is calculated in accordance with
- the equality of the number of turns of the two sub-coils 221, 222 is chosen only to simplify the comparison made. Of course, it is possible that the two partial coils 221, 222 have different numbers of turns and thus also have a different ohmic resistance. However, the sum of the number of turns of the partial coils 221, 222 is at least equal to the number of turns w, which is necessary for the required flow ⁇ . When using different wire cross-sections and / or when winding different coil diameters for the partial coils, the sum of the number of turns of the partial coils can also be greater than the number of turns w. This is the case, for example, if the partial coils are arranged concentrically with one another, so that the outer partial coil has a substantially larger coil diameter and thus a greater ohmic resistance.
- the application of the described electromagnet with partial coils connected in parallel is not restricted to injectors. It can be used wherever a high magnetic force is required from the electromagnet when the operating voltage is low.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Elektromagnetelectromagnet
Stand der TechnikState of the art
Die Erfindung geht aus von einem Elektromagneten nach dem Oberbegriff des Anspruchs 1.The invention is based on an electromagnet according to the preamble of claim 1.
Elektromagneten werden in Einspritzventilen für; Brennkraftmaschinen als Aktuatoren oder Aktoren zur Betätigung der Ventilnadel eingesetzt. Bei einem bekanntenElectromagnets are used in injectors for; Internal combustion engines are used as actuators or actuators for actuating the valve needle. With a known
Einspritzventil (DE 199 07 899 AI) ist in einem Ventilgehäuse ein Spulenraum ausgebildet, in den die auf einem Spulenträger aufgewickelte, hohlzylindrische Magnetspule eingesetzt ist. In einem zentrischen Durchgangsloch im Spulentr:äger ist ein Eisenkern angeordnet und ein Anker des Elektromagneten axial verschieblich geführt. Der Anker ist fest mit einer Ventilnadel verbunden. Die Ventilnadel wird von einer Ventilschließfeder mit einem endseitigen Schließkopf auf einem in einem Ventilkörper ausgebildeten Ventilsitz aufgedrückt, der eine Ventilöffnung umgibt. Wird dieInjection valve (DE 199 07 899 AI) a coil space is formed in a valve housing, in which the hollow cylindrical magnet coil is inserted, which is wound on a coil carrier. An iron core is arranged in a central through hole in the coil carrier and an armature of the electromagnet is axially displaceably guided. The armature is firmly connected to a valve needle. The valve needle is pressed open by a valve closing spring with an end closing head on a valve seat formed in a valve body, which surrounds a valve opening. Will the
Magnetspule bestromt, so wird der Anker gegen die Kraft der Ventilschließfeder auf den Eisenkern zubewegt und der Schließkopf von dem Ventilsitz abgehoben, so dass die Ventilöffnung mit einem vorgegeben Öffnungsquerschnitt freigegeben wird und eine bestimmte Kraftstoffmenge des unter Druck stehenden Kraftstoffs aus der Ventilöffnung ausgespritzt wird.When the solenoid is energized, the armature is moved towards the iron core against the force of the valve closing spring and the Closing head lifted off the valve seat, so that the valve opening is released with a predetermined opening cross section and a certain amount of fuel of the pressurized fuel is sprayed out of the valve opening.
Um bei Kraftstoff-Einspritzsystemen eine verbesserte Zerstäubung des ausgespritzten Kraftstoffs zu erreichen, wird der Systemdruck, mit dem der Kraftstoff dem Einspritzventil zugeführt wird, angehoben, mit der Folge, dass mit steigendem Systemdruck die Gegenkraft beim Öffnen der Ventilnadel steigt, wodurch der Elektromagnet eine größere Magnetkraft zur Verfügung stellen muss und somit die Magnetspule wegen der hierzu erforderlichen größeren Durchflutung einen höheren Strombedarf hat. Dieser Strombedarf kann von derIn order to achieve an improved atomization of the injected fuel in fuel injection systems, the system pressure at which the fuel is supplied to the injection valve is increased, with the result that the counterforce increases when the valve needle is opened as the system pressure increases, as a result of which the electromagnet has a larger size Magnetic force must be available and therefore the magnet coil has a higher current requirement due to the larger flow required for this. This power requirement can vary from the
Batteriespannung in Niedervoltnetzen, z. B. 12 V, häufig nicht aufgebracht werden, da die für eine ungestörte Funktion des Elektromagneten geforderte minimale Betriebsspannung nicht zur Verfügung steht.Battery voltage in low voltage networks, e.g. B. 12 V, are often not applied, since the minimum operating voltage required for an undisturbed function of the electromagnet is not available.
Vorteile der ErfindungAdvantages of the invention
Der erfindungsgemäße Elektromagnet mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass durch die Zusammensetzung der Magnetspule, die zur Erzeugung einer für eine gewünschte Magnetkraft erforderliche Durchflutung vorzusehen ist, aus parallelgeschalteten Teilspulen die zulässige minimale Betriebs-Gleichspannung des Elektromagneten deutlich reduziert werden kann. Das bedeutet, dass der Elektromagnet nunmehr auch dort eingesetzt werden kann, wo bisher die für eine einwandfreie Funktion des Elektromagnete geforderte minimale Betriebsspannung nicht erreicht werden konnte. Mit dem erfindungsgemäßen Elektromagneten ausgestattete Einspritzventile können somit auch bei höherem Systemdruck in Fahrzeug-Bordnetzen mit niedriger Bordspannung, z.B. 12 V, störungsfrei betrieben werden. Würde beispielsweise eine Magnetspule mit der Windungszahl w und einem OhmschenThe electromagnet according to the invention with the features of claim 1 has the advantage that the permissible minimum DC operating voltage of the electromagnet can be significantly reduced by the composition of the magnet coil, which is to be provided for generating a flow necessary for a desired magnetic force, from partial coils connected in parallel. This means that the electromagnet can now also be used where previously the minimum operating voltage required for the electromagnet to function properly could not be achieved. With Injection valves equipped with the electromagnet according to the invention can thus be operated without problems even at higher system pressure in vehicle electrical systems with a low on-board voltage, for example 12 V. For example, a magnet coil with the number of turns w and an ohmic
Widerstand R in drei gleiche Teilspulen mit jeweils einem Drittel der Windungszahl w und einem Drittel des Ohmschen Widerstands R aufgeteilt werden, so würde die minimal zulässige Betriebspannung auf ein Drittel der Betriebsspannung UB sinken und der Elektromagnet eine gleiche Magnetkraft erzeugen.Resistor R would be divided into three equal sub-coils, each with a third of the number of turns w and a third of the ohmic resistance R, the minimum permissible operating voltage would drop to a third of the operating voltage U B and the electromagnet would generate the same magnetic force.
Durch die in den weiteren Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Elektromagneten möglich.The measures listed in the further claims allow advantageous developments and improvements of the electromagnet specified in claim 1.
Ein Einspritzventil, das mit dem erfindungsgemäßen Elektromagneten ausgestattet ist, ist in Anspruch 8 angegeben.An injection valve which is equipped with the electromagnet according to the invention is specified in claim 8.
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 elektromagnetisch betätigten Einspritzventils, Fig. 2 einen Schaltplan einer Magnetspule des Elektromagneten in Fig. 1, Fig. 3 einen Schaltplan einer Magnetspule des Elektromagneten nach dem Stand der Technik.1 shows a longitudinal section of an electromagnetically actuated injection valve, FIG. 2 shows a circuit diagram of a magnet coil of the electromagnet in FIG. 1, Fig. 3 is a circuit diagram of a solenoid of the electromagnet according to the prior art.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Das in Fig. 1 im Längsschnitt dargestellte Einspritzventil ist insbesondere zum direkten Einspritzen von Kraftstoff in einen nicht dargestellten Brennraum einer Brennkraftmaschine in Fahrzeugen geeignet. Das Einspritzventil kann dabei als nach innen oder nach außen öffnendes Einspritzventil ausgeführt sein. Im Beispiel der Fig. 1 handelt es sich um ein nach innen öffnendes Einspritzventil.The injection valve shown in longitudinal section in FIG. 1 is particularly suitable for injecting fuel directly into a combustion chamber (not shown) of an internal combustion engine in vehicles. The injection valve can be designed as an injection valve opening inwards or outwards. In the example of FIG. 1, it is an injection valve that opens inwards.
Das Einspritzventil weist ein Ventilgehäuse 11 auf, in das einerseits ein langgestreckter, hohlzylindrischerThe injection valve has a valve housing 11 into which, on the one hand, an elongated, hollow-cylindrical one
Ventilkörper 12 und andererseits ein hohlzylindrischer Kraftstoff-Einlassstutzen koaxial zur Gehäuseachse eingesetzt sind. Der Ventilkörper 12 ist endseitig mit einem Ventilsitzkörper 14 abgeschlossen, in dem ein eine Ventilöffnung 15 umgebender Ventilsitz 16 ausgebildet ist. Im Ventilkörper 12 ist eine Ventilnadel 17 axial verschieblich geführt, die endseitig einen Schließkörper 18 trägt, der bei geschlossenem Einspritzventil von einer Ventilschließfeder 19 auf den Ventilsitz 16 aufgepresst wird. Das Ventilöffnen erfolgt mittels eines Aktors 20, der an der Ventilnadel 17 angreift und diese gegen die Kraft der Ventilschließfeder 19 verschiebt, so dass der Schließkörper 18 von dem Ventilsitz 16 abhebt und über einen vorbestimmten Querschnitt der Ventilöffnung 15 eine vorbestimmte Kraftstoffmenge des der Ventilöffnung 15 im Innern des Ventilkörpers 12 vorgelagerten, unter Systemdruck stehenden Kraftstoffs ausgespritzt wird. Der Aktor 20 ist als Elektromagnet ausgebildet, dessen Magnetspule 22 in einem im Ventilgehäuse 11 ausgebildeten Spulenraum 23 aufgenommen ist. Die Magnetspule 22 ist dabei üblicherweise auf einem hohlzylindrischen Spulenträger, der zwei Stirnflansche aufweist, aufgewickelt. Der Spulenraum 23 ist im Ventilgehäuse 11 so angeordnet, dass der Kraftstoff- Einlassstutzen 13 teilweise in das Innere des Spulenträgers 24 hineinragt und hier den Eisenkern des Magnetkreises des Elektromagneten bildet. Der freien Stirnseite des Kraftstoff- Einlassstutzens 13 vorgelagert ist im Ventilgehäuse 11 einValve body 12 and on the other hand, a hollow cylindrical fuel inlet connector are used coaxially to the housing axis. The valve body 12 is closed at the end with a valve seat body 14, in which a valve seat 16 surrounding a valve opening 15 is formed. A valve needle 17 is guided axially displaceably in the valve body 12 and carries a closing body 18 at the end, which is pressed onto the valve seat 16 by a valve closing spring 19 when the injection valve is closed. The valve is opened by means of an actuator 20, which engages the valve needle 17 and displaces it against the force of the valve closing spring 19, so that the closing body 18 lifts off the valve seat 16 and, over a predetermined cross section of the valve opening 15, a predetermined amount of fuel from the valve opening 15 in Inside the valve body 12 upstream, under system pressure fuel is injected. The actuator 20 is designed as an electromagnet, the magnet coil 22 of which is accommodated in a coil space 23 formed in the valve housing 11. The magnet coil 22 is usually wound on a hollow cylindrical coil carrier, which has two end flanges. The coil space 23 is arranged in the valve housing 11 in such a way that the fuel inlet connector 13 partially projects into the interior of the coil carrier 24 and here forms the iron core of the magnetic circuit of the electromagnet. The free end face of the fuel inlet connector 13 is upstream in the valve housing 11
Anker 25 des Elektromagneten axial verschieblich geführt, der teilweise in den Spulenträger 24 soweit hineinragt, dass bei unter der Wirkung der Ventilschließfeder 19 geschlossenem Einspritzventil zwischen dem Anker 25 und der Stirnseite des Eisenkerns ein Luftspalt verbleibt. Der mit Durchgangslöchern 21 für den Kraftfluss versehene Anker 25 ist fest mit der Ventilnadel 17 verbunden, und die als Druckfeder ausgebildete Ventilschließfeder 19 stützt sich einerseits am Anker 25 und andererseits im Innern des Kraftstoff-Einlassstutzens 13 ab. Die Magnetspule 22 ist an einer Gleichspannung angeschlossen.Armature 25 of the electromagnet is axially displaceably guided, which partially projects into the coil carrier 24 to such an extent that when the injection valve is closed under the action of the valve closing spring 19, an air gap remains between the armature 25 and the end face of the iron core. The armature 25 provided with through holes 21 for the force flow is firmly connected to the valve needle 17, and the valve closing spring 19 designed as a compression spring is supported on the one hand on the armature 25 and on the other hand in the interior of the fuel inlet connection 13. The solenoid 22 is connected to a DC voltage.
Damit der Elektromagnet eine zum zuverlässigen Öffnen des Ventils ausreichende Magnetkraft an der Ventilnadel 17 erzeugt, uss eine ausreichende magnetische Durchflutung Θ der Magnetspule 22 sichergestellt werden. Die Durchflutung Θ berechnet sich aus dem die Magnetspule 22 durchfließenden Strom I und der Windungszahl w der Magnetspule 22 zuIn order for the electromagnet to generate sufficient magnetic force on the valve needle 17 to reliably open the valve, sufficient magnetic flux Θ of the solenoid 22 must be ensured. The flux Θ is calculated from the current I flowing through the magnet coil 22 and the number of turns w of the magnet coil 22
Θ X w (1) Um die zur Aufbringung dieser Durchflutung Θ erforderliche Batteriespannung UB möglichst gering zu halten, weist die Magnetspule 22 mehrere Teilspulen auf, die zueinander parallel geschaltet sind. Im Ausführungsbeispiel der Fig. 1 ist die Windungszahl w der Magnetspule 22 beispielhaft auf zwei Teilspulen 221, 222 aufgeteilt, wobei die Teilspulen mit fluchtenden Spulenachsen im unveränderten Spulenraum 23 angeordnet sind. Da die Magnetspule 22 bezüglich ihrer Windungszahl geteilt ist, weisen selbstverständlich die Wickeldrähte der Teilspulen 221, 222 einen gleichen spezifischen Ohmschen Widerstand und einen gleichen Drahtquerschnitt auf. Ebenso besitzen beide Teilspulen 221, 222 einen gleichen Spulendurchmesser. Wie im Schaltplan der Fig. 2 dargestellt ist, sind die beiden Teilspulen 221, 222 parallelgeschaltet und über einen elektronischen Schalter 26 an eine Gleichspannungsquelle 27 anschließbar, deren minimale Betriebsspannung UB/2 beträgt. In Fig. 3 ist zum Vergleich der Schaltplan für eine ungeteilte Magnetspule eines herkömmlichen Elektromagneten dargestellt, die über einen elektronischen Schalter mit einer Gleichspannungsquelle verbunden ist, deren zulässige minimale Betriebsspannung UB beträgt.Θ X w (1) In order to keep the battery voltage U B required for applying this flow Θ as low as possible, the magnetic coil 22 has a plurality of partial coils which are connected in parallel with one another. In the exemplary embodiment in FIG. 1, the number of turns w of the magnetic coil 22 is divided, for example, into two sub-coils 221, 222, the sub-coils with aligned coil axes being arranged in the unchanged coil space 23. Since the magnet coil 22 is divided in terms of its number of turns, the winding wires of the partial coils 221, 222 naturally have the same specific ohmic resistance and the same wire cross section. Likewise, both sub-coils 221, 222 have the same coil diameter. As shown in the circuit diagram in FIG. 2, the two partial coils 221, 222 are connected in parallel and can be connected via an electronic switch 26 to a DC voltage source 27, the minimum operating voltage of which is U B / 2. In FIG. 3 the circuit diagram for an undivided magnetic coil of a conventional electromagnet is shown for comparison, which is connected via an electronic switch to a DC voltage source, the permissible minimum operating voltage of which is U B.
Um zu erläutern, dass mit beiden Schaltungen eine gleiche Durchflutung Θ in der Magnetspule erreicht wird, und zwar in der Schaltung gemäß Fig. 2 mit nur halb so großer Gleichspannung, ist in Fig. 2 angenommen, dass die Windungszahl w der Magnetspule gleichmäßig auf die beiden Teilspulen 221, 222 aufgeteilt ist, jede Teilspule also die gleiche Windungszahl w/2 und den gleichen Ohmschen Widerstand R/2 aufweist. In Fig. 2 ergibt sich die Gesamtdurchflutung Θ aus der Summe der Teildurchflutungen, also zu: ww ww Θ = I • - — ++ II ■ ■ — (2) . 2 ~2 Der in jeder Teilspule 221, 222 fließende Strom berechnet sich gemäß nachstehender Gl . (3) zu:In order to explain that with both circuits, the same flux Θ is achieved in the magnetic coil, namely in the circuit according to FIG. 2 with only half the DC voltage, in FIG. 2 it is assumed that the number of turns w of the magnetic coil is even on the is divided into two sub-coils 221, 222, each sub-coil thus has the same number of turns w / 2 and the same ohmic resistance R / 2. In Fig. 2, the total flooding Θ results from the sum of the partial floodings, ie: ww ww Θ = I • - - ++ II ■ ■ - (2). 2 ~ 2 The current flowing in each coil section 221, 222 is calculated according to Eq. (3) to:
Gl . (3) in Gl . (2) eingesetzt ergibt eine Durchflutung gemäß nachstehender Gl . (4) zu: w (4) REq. (3) in Eq. (2) inserted results in a flooding according to Eq. (4) to: w (4) R
In der Schaltungsanordnung gemäß Fig. 3 berechnet sich der Strom I gemäßIn the circuit arrangement according to FIG. 3, the current I is calculated in accordance with
Gl . (5) in Gl . (1) eingesetzt ergibtEq. (5) in Eq. (1) used results
Θ = -2- ■ w (6) RΘ = -2- ■ w (6) R
Wie ein Vergleich der Gl . (4) und (6) zeigt, ist die in beiden Schaltungsanordnungen erzielte Durchflutung Θ der Magnetspule 22, und damit die Magnetkraft des Elektromagneten, gleich groß. Mit der Schaltungsanordnung gemäß Fig. 2 wird jedoch diese Durchflutung Θ mit einer nur halb so großen Spannung UB erreicht. In beiden Fällen ist auch die zur Ansteuerung des Elektromagneten aufzubringende Leistung gleich groß und beträgtLike a comparison of Eq. (4) and (6) shows the flow erziel achieved in both circuit arrangements Magnetic coil 22, and thus the magnetic force of the electromagnet, the same size. With the circuit arrangement according to FIG. 2, however, this flooding nur is achieved with a voltage U B that is only half as great. In both cases, the power to be applied to control the electromagnet is the same and is the same
U„ P = (7) RU "P = (7) R
Die Gleichheit der Windungszahlen der beiden Teilspulen 221, 222 ist lediglich zur Vereinfachung des angestellten Vergleichs gewählt. Selbstverständlich ist es möglich, dass die beiden Teilspulen 221, 222 unterschiedliche Windungszahlen aufweisen und damit auch einen unterschiedlichen Ohmschen Widerstand besitzen. Die Summe der Windungszahlen der Teilspulen 221, 222 ist aber mindestens gleich der Windungszahl w, die für die geforderte Durchflutung Θ notwendig ist. Bei Verwendung unterschiedlicher Drahtquerschnitte und/oder beim Wickeln unterschiedlicher Spulendurchmesser für die Teilspulen kann die Summe der Windungszahlen der Teilspulen auch größer als die Windungszahl w sein. Dies ist beispielsweise der Fall, wenn die Teilspulen konzentrisch zueinander angeordnet werden, so dass die äußere Teilspule eine wesentlich größeren Spulendurchmesser und damit einen größeren Ohmschen Widerstand aufweist.The equality of the number of turns of the two sub-coils 221, 222 is chosen only to simplify the comparison made. Of course, it is possible that the two partial coils 221, 222 have different numbers of turns and thus also have a different ohmic resistance. However, the sum of the number of turns of the partial coils 221, 222 is at least equal to the number of turns w, which is necessary for the required flow Θ. When using different wire cross-sections and / or when winding different coil diameters for the partial coils, the sum of the number of turns of the partial coils can also be greater than the number of turns w. This is the case, for example, if the partial coils are arranged concentrically with one another, so that the outer partial coil has a substantially larger coil diameter and thus a greater ohmic resistance.
Selbstverständlich ist es möglich, die Windungszahl w der Magnetspule 22 auf mehr als zwei Teilspulen aufzuteilen. Wird die Aufteilung auf insgesamt n Teilspulen vorgenommen, so sinkt die zur Aufrechterhaltung der gleichen Durchflutung erforderliche minimale Betriebs-Gleichspannung auf UB/n.Of course, it is possible to divide the number of turns w of the solenoid 22 over more than two sub-coils. If the distribution is made up of a total of n partial coils, then the minimum operating DC voltage required to maintain the same flooding drops to U B / n.
Der beschriebene Elektromagnet mit parallelgeschalteten Teilspulen ist in seiner Anwendung nicht auf Einspritzventile beschränkt. Er kann überall dort eingesetzt werden, wo bei zur Verfügung stehender niedriger Betriebsspannung, dem Elektromagneten eine hohe Magnetkraft abverlangt wird. The application of the described electromagnet with partial coils connected in parallel is not restricted to injectors. It can be used wherever a high magnetic force is required from the electromagnet when the operating voltage is low.
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10349634.3 | 2003-10-24 | ||
| DE2003149634 DE10349634A1 (en) | 2003-10-24 | 2003-10-24 | electromagnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2005041223A1 true WO2005041223A1 (en) | 2005-05-06 |
Family
ID=34442230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2004/052569 Ceased WO2005041223A1 (en) | 2003-10-24 | 2004-10-18 | Electromagnet |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE10349634A1 (en) |
| WO (1) | WO2005041223A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2846031A1 (en) * | 2013-09-06 | 2015-03-11 | Continental Automotive GmbH | Electromagnetic coil for a fluid injector and fluid injector |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014200184A1 (en) * | 2014-01-09 | 2015-07-09 | Robert Bosch Gmbh | Method and circuit arrangement for controlling injection valves, in particular a spark-ignited internal combustion engine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4254935A (en) * | 1979-07-06 | 1981-03-10 | Lucas Industries Limited | Solenoid construction |
| US5363270A (en) * | 1992-09-18 | 1994-11-08 | General Motors Corporation | Rapid response dual coil electromagnetic actuator with capacitor |
| US6373363B1 (en) * | 2000-03-28 | 2002-04-16 | Delphi Technologies, Inc. | Dual coil solenoid for a gas direct injection fuel injector |
| GB2383195A (en) * | 2001-12-14 | 2003-06-18 | Delphi Tech Inc | Solenoid actuated valve |
-
2003
- 2003-10-24 DE DE2003149634 patent/DE10349634A1/en not_active Ceased
-
2004
- 2004-10-18 WO PCT/EP2004/052569 patent/WO2005041223A1/en not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4254935A (en) * | 1979-07-06 | 1981-03-10 | Lucas Industries Limited | Solenoid construction |
| US5363270A (en) * | 1992-09-18 | 1994-11-08 | General Motors Corporation | Rapid response dual coil electromagnetic actuator with capacitor |
| US6373363B1 (en) * | 2000-03-28 | 2002-04-16 | Delphi Technologies, Inc. | Dual coil solenoid for a gas direct injection fuel injector |
| GB2383195A (en) * | 2001-12-14 | 2003-06-18 | Delphi Tech Inc | Solenoid actuated valve |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2846031A1 (en) * | 2013-09-06 | 2015-03-11 | Continental Automotive GmbH | Electromagnetic coil for a fluid injector and fluid injector |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10349634A1 (en) | 2005-05-19 |
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