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WO2012080009A1 - Device for inductively heating a fuel injection valve - Google Patents

Device for inductively heating a fuel injection valve Download PDF

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Publication number
WO2012080009A1
WO2012080009A1 PCT/EP2011/071659 EP2011071659W WO2012080009A1 WO 2012080009 A1 WO2012080009 A1 WO 2012080009A1 EP 2011071659 W EP2011071659 W EP 2011071659W WO 2012080009 A1 WO2012080009 A1 WO 2012080009A1
Authority
WO
WIPO (PCT)
Prior art keywords
terminal
coil
resonant circuit
controllable switch
heating
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.)
Ceased
Application number
PCT/EP2011/071659
Other languages
German (de)
French (fr)
Inventor
Stephan Bolz
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.)
Continental Automotive GmbH
Original Assignee
Continental Automotive GmbH
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Filing date
Publication date
Application filed by Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of WO2012080009A1 publication Critical patent/WO2012080009A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • 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
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2065—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit the control being related to the coil temperature
    • 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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • F02M53/06—Injectors with heating, cooling, or thermally-insulating means with fuel-heating means, e.g. for vaporising

Definitions

  • the invention relates to a device for inductive heating of an inductive fuel injection valve in a power ⁇ vehicle with a parallel resonant circuit of a heating ⁇ winding forming resonant circuit coil and a capacitor, wherein the connection points of the resonant circuit coil and the capacitor form a first and a second Schwing Vietnamese- circuit the first resonant circuit connection is connected to a reference potential connection via a first controllable switch and the second oscillating circuit connection is connected to the reference potential connection via a second controllable switch.
  • the control terminal of the controllable switch is connected via a diode poled in the first passage to the second swing ⁇ circuit terminal and the control terminal of the second controllable switch via a second diode polarized in the conducting with the first oscillator circuit connection.
  • a center tap of the oscillation circuit coil are supply voltage terminal for applying the device to a supply voltage with a ballast by means of a choke coil and the control inputs of the controllable switches connected ⁇ .
  • Oscillating circuit coil formed as a primary winding of a transformer, the secondary winding is connected in parallel with the solenoid drive of an electromagnetic Kraftstoffein ⁇ injection valve together with a series-connected filter capacitor to which also the series ⁇ circuit of a heating coil and another filter capacitor are connected in parallel.
  • a resonant circuit in the high-frequency electromagnetic energy over the transformer is ⁇ over, in order to convert these in the heating coil in conjunction with the ferromagnetic material of the valve housing in heat ⁇ .
  • the center tapped oscillating ⁇ circular coil itself is used as a heating coil for inductive heating of the fuel injection valve.
  • the heating coil is designed in principle as an autotransformer, ie only with the primary winding with center tap.
  • control inputs of the controllable switches are each connected via a resistor to the supply connection. Through this Resistors, the current through the first and the second diode is limited.
  • the heating coils required for this purpose - also designed as a Spartrafo - can be switched parallel to the oscillating ⁇ circle coil and thus also supplied by the Os ⁇ zillator with electromagnetic energy.
  • the heating coils are bifilar designed to allow a good magnetic coupling of both partial windings, which in turn compensates the load of the driving switch. By suitable choice of the number of turns and the capacity of the resonant circuit capacitor, both the oscillation frequency and the heating power can be adjusted.
  • the bifilar winding reduces differences in the magnetic flux in the housing of the fuel injector, thus avoiding cross-reactions to the near solenoid drive of the fuel injector.
  • FIG. 1 shows a first device according to the invention
  • Figure 2 shows a device according to the invention with several
  • Winding structure of the oscillating circuit coil Winding structure of the oscillating circuit coil.
  • Figure 1 shows a parallel resonant circuit of a resonant ⁇ circuit capacitor Cl and a resonant circuit coil LI.
  • Oscillating circuit coil LI form a first resonant circuit connection AI and a second resonant circuit connection A2.
  • the first resonant circuit connection AI is connected via a first controllable switch, which is realized in the illustrated embodiment as a MOSFET, to a reference potential terminal A3.
  • the second resonant circuit terminal A2 is also connected to the reference potential terminal A3 via a second controllable switch T2, which is also realized in the illustrated embodiment as a MOSFET.
  • the control terminal of the first controllable switch Tl is connected via a first resistor Rl to a supply potential terminal Vo and via a first forward-biased diode Dl to the second resonant circuit terminal A2.
  • the control terminal of the second controllable switch T2 is connected in the same way via a second resistor R2 to the supply potential terminal Vo and via a forward-biased second diode D2 to the first resonant circuit terminal AI.
  • the reference potential terminal A3 is connected via a third controllable on / off switch T3 to ground potential GND.
  • the on / off switch T3 has its control terminal connected to a power on / off terminal I / O.
  • the oscillating circuit coil LI directly forms the heating coil of the inductive heating of a fuel injection valve.
  • This can be a costly transformer for non-galvanic coupling high-frequency electromagnetic energy in the circuit of the Solenoidantriebs the fuel injection valve can be avoided.
  • FIG. 2 shows a development of the device according to the invention, in which the same parts are provided with the same reference numerals.
  • a plurality of heating coils LH, L12 are provided in accordance with Figure 2, which are indicated by points further possible heating ⁇ developments. Due to this advantageous parallel connection of the heating coils, the energy for all heating coils can be obtained from only one oscillator. In this case, only the values for the resonant circuit coils and the resonant circuit capacitor C1 need to be adjusted accordingly in order to set the required heating power and the desired frequency.
  • the resonant circuit coils LI, LH, L12 are bifilar wound to avoid leakage inductances, which could possibly influence the solenoid drive. With an appropriate structure of the fuel injection valve, this may not be necessary, so that advantageously a simple winding can be used and according to FIG. 3 the oscillating circuit coil can be realized by two simple partial coils L21 and L22 connected in series. Also for this embodiment of a resonant circuit coil can be connected in parallel in the same manner as in Figure 2, according to further realized by partial windings heating coils.

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

Abstract

The invention relates to a device for inductively heating a fuel injection valve having a parallel oscillatory circuit composed of an oscillatory circuit coil (L1; L11; L12; L21; L22) forming a heating winding, and a capacitor (C1), wherein the connecting points of the coil and of the capacitor (C1) form a first oscillatory circuit terminal (A1) and a second oscillatory circuit terminal (A2). The first oscillatory circuit terminal (A1) is connected here via a first controllable switch (T1), and the second oscillatory circuit terminal (A2) via a second controllable switch (T2), to the reference potential terminal (A3). The control terminal of the first controllable switch (T1) is connected to the second oscillatory circuit terminal (A2) via a first diode (D1) which is connected with its polarity in the on direction, and the control terminal of the second controllable switch (T2) is connected to the first oscillatory circuit terminal (A1) via a second diode (D2) which is connected with its polarity in the on direction. A centre tap of the oscillatory circuit coil is connected via a reactor (L2) and the control inputs of the controllable switch (T1, T2) to a supply voltage terminal (V0) for the application of a supply voltage. The oscillatory circuit coil inventively forms a heating winding for inductively heating the fuel injection valve.

Description

Beschreibung description

Vorrichtung zum induktiven Heizen eines Kraftstoffeinspritz- ventils Device for inductive heating of a fuel injection valve

Die Erfindung betrifft eine Vorrichtung zum induktiven Heizen eines induktiven Kraftstoffeinspritzventils in einem Kraft¬ fahrzeug mit einem Parallelschwingkreis aus einer eine Heiz¬ wicklung bildenden Schwingkreisspule und einem Kondensator, wobei die Verbindungspunkte der Schwingkreisspule und des Kondensators einem ersten und einem zweiten Schwingkreisan- schluss bilden, wobei der erste Schwingkreisanschluss über einen ersten steuerbaren Schalter mit einem Bezugspotentialanschluss und der zweite Schwingkreisanschluss über einen zweiten steuerbaren Schalter mit dem Bezugspotentialanschluss verbunden sind. Der Steueranschluss des steuerbaren Schalters ist über eine in Durchlass gepolte erste Diode mit dem zweiten Schwing¬ kreisanschluss und der Steueranschluss des zweiten steuerbaren Schalters über eine in Durchlass gepolte zweite Diode mit dem ersten Schwingkreisanschluss verbunden. Ein Mittenabgriff der Schwingkreisspule ist über eine Drosselspule und die Steuer¬ eingänge der steuerbaren Schalter sind mit einem Versor- gungsspannungsanschluss zur Beaufschlagung der Vorrichtung mit einer Versorgungsspannung verbunden. The invention relates to a device for inductive heating of an inductive fuel injection valve in a power ¬ vehicle with a parallel resonant circuit of a heating ¬ winding forming resonant circuit coil and a capacitor, wherein the connection points of the resonant circuit coil and the capacitor form a first and a second Schwingkreisan- circuit the first resonant circuit connection is connected to a reference potential connection via a first controllable switch and the second oscillating circuit connection is connected to the reference potential connection via a second controllable switch. The control terminal of the controllable switch is connected via a diode poled in the first passage to the second swing ¬ circuit terminal and the control terminal of the second controllable switch via a second diode polarized in the conducting with the first oscillator circuit connection. A center tap of the oscillation circuit coil are supply voltage terminal for applying the device to a supply voltage with a ballast by means of a choke coil and the control inputs of the controllable switches connected ¬.

Eine solche Vorrichtung ist aus der US 2007/200006 AI bekannt. Diese Vorrichtung bildet einen Oszillator, der hochfrequente elektromagnetische Energie in der Schwingkreisspule erzeugt. Bei der Vorrichtung der US 2007/200006 AI ist jedoch die Such a device is known from US 2007/200006 AI. This device forms an oscillator that generates high-frequency electromagnetic energy in the resonant circuit coil. In the device of US 2007/200006 AI, however, is the

Schwingkreisspule als Primärwicklung eines Transformators ausgebildet, dessen Sekundärwicklung zusammen mit einem in Serie zur Sekundärwicklung geschalteten Filterkondensator parallel zum Solenoidantrieb eines elektromagnetischen Kraftstoffein¬ spritzventils geschaltet ist, zu dem außerdem die Serien¬ schaltung aus einer Heizwicklung und einem weiteren Filterkondensator parallel geschaltet sind. Hierbei bilden die Se¬ kundärwicklung des Transformators, die beiden Filterkonden- satoren und die Heizwicklung einen Schwingkreis, in den über den Transformator hochfrequente elektromagnetische Energie über¬ tragen wird, um diese in der Heizwicklung in Verbindung mit dem ferromagnetischen Material des Ventilgehäuses in Wärme umzu¬ setzen. Der Vorteil der dortigen aufwändigen Konstruktion ist, dass nur zwei Verbindungsleitungen zum Einspritzventil geführt werden müssen. Oscillating circuit coil formed as a primary winding of a transformer, the secondary winding is connected in parallel with the solenoid drive of an electromagnetic Kraftstoffein ¬ injection valve together with a series-connected filter capacitor to which also the series ¬ circuit of a heating coil and another filter capacitor are connected in parallel. These were the Se ¬ kundärwicklung of the transformer, the two Filterkonden- and the heating coil, a resonant circuit in the high-frequency electromagnetic energy over the transformer is ¬ over, in order to convert these in the heating coil in conjunction with the ferromagnetic material of the valve housing in heat ¬ . The advantage of the elaborate construction there is that only two connecting lines to the injection valve must be performed.

Allerdings ist für die hierfür erforderliche drahtlose However, wireless is required for this purpose

Einkopplung der hochfrequenten elektromagnetischen Energie des Oszillators der Transformator erforderlich, der bei der geforderten Leistung von ca. 1 kW und den typischen Werten für die Frequenz von 50 kHz bis 100 kHz sehr teuer ist, zumal er aus mehreren teil angezapften Wicklungen aufgebaut sein muss, die zudem gegeneinander isoliert sind. Wegen des bei den hohen Frequenzen auftretenden Skineffetes müssen die Wicklungen zudem aus Litze mit Einzeladerisolierung - sog. HF-Litze - angefertigt werden, was die Kosten weiter erhöht. Coupling the high-frequency electromagnetic energy of the oscillator of the transformer required, which is very expensive at the required power of about 1 kW and the typical values for the frequency of 50 kHz to 100 kHz, especially since it must be composed of several partially tapped windings, the also isolated from each other. Due to the skin effect occurring at high frequencies, the windings also have to be made of stranded wire with single wire insulation - so-called HF strand - which further increases costs.

Sollen nun, wie bei einem üblichen Vierzylindermotor naheliegend, mehrere Kraftstoffeinspritzventile induktiv geheizt werden, so führt eine funktional, technisch und kostenmäßig vorteilhafte Ausgestaltung sehr leicht zu einer Mehrzahl von Induktivitäten und Transformatoren. If now, as in a conventional four-cylinder engine obvious, several fuel injection valves are heated inductively, so performs a functional, technical and cost advantageous embodiment very easily to a plurality of inductors and transformers.

Es ist daher die Aufgabe der Erfindung, eine Vorrichtung anzugeben, die kostengünstiger ist. It is therefore the object of the invention to provide a device that is less expensive.

Die Aufgabe wird gelöst durch eine gattungsgemäße Vorrichtung, bei der gemäß Patentanspruch 1 die mittenangezapfte Schwing¬ kreisspule selbst als Heizwicklung zum induktiven Heizen des Kraftstoffeinspritzventils verwendet wird. Die Heizwicklung ist dabei im Prinzip als Spartransformator ausgeführt, also nur mit der Primärwicklung mit Mittenanzapfung. The object is achieved by a generic device in which according to claim 1, the center tapped oscillating ¬ circular coil itself is used as a heating coil for inductive heating of the fuel injection valve. The heating coil is designed in principle as an autotransformer, ie only with the primary winding with center tap.

In vorteilhafter Weiterbildung der Erfindung sind die Steuereingänge der steuerbaren Schalter jeweils über einen Widerstand mit dem Versorgungsanschluss verbunden. Durch diese Widerstände wird der Strom durch die erste und die zweite Diode begrenzt . In an advantageous embodiment of the invention, the control inputs of the controllable switches are each connected via a resistor to the supply connection. Through this Resistors, the current through the first and the second diode is limited.

Für den Fall, dass weitere Einspritzventile beheizt werden sollen, können die hierfür erforderlichen Heizwicklungen - ebenfalls als Spartrafo ausgebildet - parallel zur Schwing¬ kreisspule geschaltet werden und somit ebenfalls von dem Os¬ zillator mit elektromagnetischer Energie versorgt werden. In vorteilhafter Weise sind die Heizwicklungen bifilar ausgeführt, um eine gute magnetische Kopplung beider Teilwicklungen zu ermöglichen, was wiederum die Belastung der ansteuernden Schalter ausgleicht. Durch geeignete Wahl der Windungszahl und der Kapazität des Schwingkreiskondensators lassen sich sowohl die Schwingfrequenz als auch die Heizleistung einstellen. Des Weiteren reduziert die bifilare Wicklungsweise Unterschiede im magnetischen Fluss im Gehäuse des Kraftstoffeinspritzventils, so dass Querwirkungen auf den nahebefindlichen Solenoidantrieb des Kraftstoffeinspritzventils vermieden werden. In the event that additional injectors are to be heated, the heating coils required for this purpose - also designed as a Spartrafo - can be switched parallel to the oscillating ¬ circle coil and thus also supplied by the Os ¬ zillator with electromagnetic energy. Advantageously, the heating coils are bifilar designed to allow a good magnetic coupling of both partial windings, which in turn compensates the load of the driving switch. By suitable choice of the number of turns and the capacity of the resonant circuit capacitor, both the oscillation frequency and the heating power can be adjusted. Furthermore, the bifilar winding reduces differences in the magnetic flux in the housing of the fuel injector, thus avoiding cross-reactions to the near solenoid drive of the fuel injector.

Für den Fall, dass eine Kompensation der Gleichstromanteile in den Teilwicklungen der Heizwicklung nicht erforderlich ist, so kann auf eine bifilare Wicklung verzichtet werden. Die Zu¬ sammenschaltung von mehreren Heizwicklungen erfolgt dann in einfacher Weise. Dies spart zudem Kosten für Verbindungslei¬ tungen und Steckverbindungen. In the event that a compensation of the DC components in the partial windings of the heating coil is not required, it can be dispensed with a bifilar winding. To ¬ sammenschaltung of several heating coils then takes place in a simple manner. This also saves costs for Verbindungslei ¬ lines and connectors.

Um die Heizung der Kraftstoffemspitzventile ein- und aus¬ schalten zu können, ist in einer Weiterbildung der Erfindung da Bezugspotential über einen Ein-/Ausschalter mit einem Massepotential verbunden. To turn the heating of the Kraftstoffemspitzventile and to turn off ¬, in a further development of the invention, since the reference potential is connected via an on / off switch to a ground potential.

Die Erfindung soll nachfolgend anhand von Ausführungsbeispielen mit Hilfe von Figuren näher beschrieben werden. Dabei zeigen The invention will be described below with reference to exemplary embodiments with the aid of figures. Show

Figur 1 eine erste erfindungsgemäße Vorrichtung, Figur 2 eine erfindungsgemäße Vorrichtung mit mehreren FIG. 1 shows a first device according to the invention, Figure 2 shows a device according to the invention with several

Heizwicklungen und  Heating coils and

Figur 3 eine erfindungsgemäße Vorrichtung mit vereinfachtem 3 shows a device according to the invention with simplified

Wicklungsaufbau der Schwingkreisspule.  Winding structure of the oscillating circuit coil.

Figur 1 zeigt einen Parallelschwingkreis aus einem Schwing¬ kreiskondensator Cl und einer Schwingkreisspule LI. Die Verbindungspunkte des Schwingkreiskondensators Cl und der Figure 1 shows a parallel resonant circuit of a resonant ¬ circuit capacitor Cl and a resonant circuit coil LI. The connection points of the resonant circuit capacitor Cl and the

Schwingkreisspule LI bilden einen ersten Schwingkreisanschluss AI und einen zweiten Schwingkreisanschluss A2. Der erste Schwingkreisanschluss AI ist über einen ersten steuerbaren Schalter, der im dargestellten Ausführungsbeispiel als MOSFET realisiert ist, mit einem Bezugspotentialanschluss A3 verbunden. Desgleichen ist der zweite Schwingkreisanschluss A2 über einen zweiten steuerbaren Schalter T2, der im dargestellten Ausführungsbeispiel ebenfalls als MOSFET realisiert ist, ebenfalls mit dem Bezugspotentialanschluss A3 verbunden. Oscillating circuit coil LI form a first resonant circuit connection AI and a second resonant circuit connection A2. The first resonant circuit connection AI is connected via a first controllable switch, which is realized in the illustrated embodiment as a MOSFET, to a reference potential terminal A3. Similarly, the second resonant circuit terminal A2 is also connected to the reference potential terminal A3 via a second controllable switch T2, which is also realized in the illustrated embodiment as a MOSFET.

Der Steueranschluss des ersten steuerbaren Schalters Tl ist über einen ersten Widerstand Rl mit einem Versorgungspotentialan- schluss Vo und über eine erste in Durchlassrichtung gepolte Diode Dl mit dem zweiten Schwingkreisanschluss A2 verbunden. Der Steueranschluss des zweiten steuerbaren Schalters T2 ist in gleicher Weise über einen zweiten Widerstand R2 mit dem Ver- sorgungspotentialanschluss Vo und über eine in Durchlassrichtung gepolte zweite Diode D2 mit dem ersten Schwingkreisanschluss AI verbunden. Der Bezugspotentialanschluss A3 ist über einen dritten steuerbaren Ein-/Ausschalt-Schalter T3 mit Massepotential GND verbunden. Der Ein-/Ausschaltschalter T3 ist mit seinem Steueranschluss mit einem Einschalt-/Ausschaltanschluss E/A verbunden. The control terminal of the first controllable switch Tl is connected via a first resistor Rl to a supply potential terminal Vo and via a first forward-biased diode Dl to the second resonant circuit terminal A2. The control terminal of the second controllable switch T2 is connected in the same way via a second resistor R2 to the supply potential terminal Vo and via a forward-biased second diode D2 to the first resonant circuit terminal AI. The reference potential terminal A3 is connected via a third controllable on / off switch T3 to ground potential GND. The on / off switch T3 has its control terminal connected to a power on / off terminal I / O.

In erfindungsgemäßer Weise bildet die Schwingkreisspule LI direkt die Heizwicklung der induktiven Heizung eines Kraftstoffeinspritzventils . Hierdurch kann ein kostenintensiver Transformator zur nichtgalvanischen Einkopplung hochfrequenter elektromagnetischer Energie in den Stromkreis des Solenoidantriebs des Kraftstoffeinspritzventils vermieden werden . In accordance with the invention, the oscillating circuit coil LI directly forms the heating coil of the inductive heating of a fuel injection valve. This can be a costly transformer for non-galvanic coupling high-frequency electromagnetic energy in the circuit of the Solenoidantriebs the fuel injection valve can be avoided.

Figur 2 zeigt eine Weiterbildung der erfindungsgemäßen Vor- richtung, bei der gleiche Teile mit gleichen Bezugszeichen versehen sind. Um mehrere Kraftstoffeinspritzventile induktiv heizen zu können, sind gemäß Figur 2 mehrere Heizwicklungen LH, L12 vorgesehen, wobei durch Punkte weitere mögliche Heiz¬ wicklungen angedeutet sind. Durch diese vorteilhafte Paral- lelschaltung der Heizwicklungen kann die Energie für sämtliche Heizwicklungen aus nur einem Oszillator bezogen werden. Dabei müssen lediglich die Werte für die Schwingkreisspulen und den Schwingkreiskondensator Cl entsprechend angepasst werden, um die erforderliche Heizleistung und die gewünschte Frequenz ein- zustellen. Figure 2 shows a development of the device according to the invention, in which the same parts are provided with the same reference numerals. In order to heat a plurality of fuel injection valves inductively, a plurality of heating coils LH, L12 are provided in accordance with Figure 2, which are indicated by points further possible heating ¬ developments. Due to this advantageous parallel connection of the heating coils, the energy for all heating coils can be obtained from only one oscillator. In this case, only the values for the resonant circuit coils and the resonant circuit capacitor C1 need to be adjusted accordingly in order to set the required heating power and the desired frequency.

In vorteilhafter Weise sind die Schwingkreisspulen LI, LH, L12 bifilar gewickelt, um Streuinduktivitäten zu vermeiden, die gegebenenfalls den Solenoidantrieb beeinflussen könnten. Bei entsprechendem Aufbau des Kraftstoffeinspritzventils ist dies edoch gegebenenfalls nicht nötig, so dass in vorteilhafter Weise eine einfache Wicklung verwendet werden kann und gemäß Figur 3 die Schwingkreisspule durch zwei in Serie geschaltete einfache Teilspulen L21 und L22 realisiert werden kann. Auch zu dieser Ausbildung einer Schwingkreisspule können in gleicher Weise wie in Figur 2 gezeigt, entsprechend weitere durch Teilwicklungen realisierte Heizwicklungen parallel geschaltet werden. Advantageously, the resonant circuit coils LI, LH, L12 are bifilar wound to avoid leakage inductances, which could possibly influence the solenoid drive. With an appropriate structure of the fuel injection valve, this may not be necessary, so that advantageously a simple winding can be used and according to FIG. 3 the oscillating circuit coil can be realized by two simple partial coils L21 and L22 connected in series. Also for this embodiment of a resonant circuit coil can be connected in parallel in the same manner as in Figure 2, according to further realized by partial windings heating coils.

Durch die Einsparungen des bzw. der teuren Transformatoren gelingt es, ein System zur induktiven Kraftstoffheizung herzustellen, das wirtschaftlich konkurrenzfähig ist und zugleich noch wesentliche, für den Nutzer wahrnehmbare Vorteile bietet. The savings of the expensive transformer (s) make it possible to produce a system for inductive fuel heating that is economically competitive and at the same time still offers significant advantages perceivable to the user.

Claims

Patentansprüche claims 1. Vorrichtung zum induktiven Heizen eines Kraftstoffein- spritzventils 1. Device for inductive heating of a Kraftstoffein- injection valve - mit einem Parallelschwingkreis aus einer eine Heizwicklung bildenden Schwingkreisspule (LI; LH; L12; L21; L22) und einem Kondensator (Cl) wobei die Verbindungspunkte der Spule (LI; LH; L12; L21; L22) und des Kondensators (Cl) einen ersten (AI) und einen zweiten (A2) Schwingkreisanschluss bilden, - having a parallel resonant circuit of a heating coil forming resonant circuit coil (LI; LH; L12; L21; L22) and a capacitor (Cl) wherein the connection points of the coil (LI; LH; L12; L21; L22) and the capacitor (Cl) one form first (AI) and a second (A2) resonant circuit connection, - wobei der erste Schwingkreisanschluss (AI) über einen ersten steuerbaren Schalter (Tl) mit einem Bezugspotentialanschluss (A3) verbunden ist, - Wherein the first resonant circuit terminal (AI) via a first controllable switch (Tl) is connected to a reference potential terminal (A3), - wobei der zweite Schwingkreisanschluss (A2) über einen zweiten steuerbaren Schalter (T2) mit dem Bezugspotentialanschluss (A3) verbunden ist, - wobei der Steueranschluss des ersten steuerbaren Schalters (Tl) über eine in Durchlassrichtung gepolte erste Diode (Dl) mit dem zweiten Schwingkreisanschluss (A2) und der Steueranschluss des zweiten steuerbaren Schalters (T2) über eine in Durchlassrichtung gepolte zweite Diode (D2) mit dem ersten Schwing- kreisanschluss (AI) verbunden ist und - Wherein the second resonant circuit terminal (A2) via a second controllable switch (T2) to the reference potential terminal (A3) is connected, - wherein the control terminal of the first controllable switch (Tl) via a forward-biased first diode (Dl) with the second resonant circuit terminal (A2) and the control terminal of the second controllable switch (T2) is connected via a forward-biased second diode (D2) to the first oscillating circuit terminal (AI) and - wobei sowohl ein Mittenabgriff der Schwingkreisspule (LI; LH; L12; L21; L22) über eine Drosselspule (L2) als auch die Steuereingänge der steuerbaren Schalter (Tl, T2) mit einem Versorgungsspannungsanschluss (V0) zur Beaufschlagung mit einer Versorgungsspannung verbunden sind, dadurch gekennzeichnet, dass die Schwingkreisspule (LI; LH; L12; L21; L22) eine Heizwicklung zum induktiven Heizen des Kraftstoffeinspritz- ventils bildet. - Wherein both a center tap of the resonant circuit coil (LI; LH; L12; L21; L22) via a choke coil (L2) and the control inputs of the controllable switch (Tl, T2) are connected to a supply voltage terminal (V 0 ) for application to a supply voltage , characterized in that the resonant circuit coil (LI; LH; L12; L21; L22) forms a heating coil for inductive heating of the fuel injection valve. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Steuereingänge der steuerbaren Schalter (Tl, T2) jeweils über einen Widerstand (Rl, R2 ) mit dem Versorgungspotentialanschluss (Vo) verbunden sind. 2. Apparatus according to claim 1, characterized in that the control inputs of the controllable switch (Tl, T2) are each connected via a resistor (Rl, R2) to the supply potential terminal (Vo). 3. Vorrichtung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass der Schwingkreisspule (LI) weitere Spulen (LH; L12) als Heizwicklungen für weitere Einspritzventile parallel geschaltet sind. 3. Device according to one of the preceding claims, characterized in that the resonant circuit coil (LI) further coils (LH; L12) are connected in parallel as heating coils for further injection valves. 4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Schwingkreisspule (LI) und gegebenenfalls die weiteren Heizwicklungen (LH, L12) als Serienschaltung aus zwei Spulen (L21, L22) gebildet sind und der Verbindungspunkt der Spulen den Mittenabgriff bildet. 4. Device according to one of claims 1 to 3, characterized in that the resonant circuit coil (LI) and optionally the further heating coils (LH, L12) as a series circuit of two coils (L21, L22) are formed and the connection point of the coils forms the center tap , 5. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Schwingkreisspule bzw. die Schwing- kreisspulen (LI; LH, L12; L21, L22) bifilar gewickelt sind. 5. Device according to one of claims 1 to 3, characterized in that the oscillating circuit coil or the oscillating circle coils (LI, LH, L12, L21, L22) are wrapped bifilar. 6. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Bezugspotentialanschluss (A3) über einen Einschalt- / Ausschaltschalter (T3) mit einem Massepo- tential (GND) verbunden ist. 6. Device according to one of the preceding claims, characterized in that the reference potential terminal (A3) via a switch-on / off switch (T3) is connected to a ground potential (GND).
PCT/EP2011/071659 2010-12-15 2011-12-02 Device for inductively heating a fuel injection valve Ceased WO2012080009A1 (en)

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DE102011085085B4 (en) 2011-10-24 2014-04-03 Continental Automotive Gmbh Circuit arrangement for supplying energy for inductive heating to a fuel injection valve

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WO2014032932A1 (en) * 2012-08-28 2014-03-06 Continental Automotive Gmbh Circuit arrangement for inductively heating at least one fuel injector, fuel injector arrangement comprising such a circuit arrangement, adn method for operating a circuit arrangement and a fuel injector arrangement
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CN104584684A (en) * 2012-08-28 2015-04-29 大陆汽车有限公司 Circuit arrangement for inductively heating a fuel injector
CN104584685A (en) * 2012-08-28 2015-04-29 欧陆汽车有限责任公司 Circuit arrangement for inductively heating at least one fuel injector, fuel injector arrangement comprising the circuit arrangement, and method for operating the circuit arrangement and the fuel injector arrangement
CN104584684B (en) * 2012-08-28 2016-05-11 大陆汽车有限公司 For the circuit arrangement of inductive heating fuel injection valve
CN104584685B (en) * 2012-08-28 2017-09-01 欧陆汽车有限责任公司 Circuit arrangement and the Fuelinjection nozzle door gear with such circuit arrangement and the method for running circuit arrangement and Fuelinjection nozzle door gear for inductive heating at least one fuel injection valve
US9810187B2 (en) 2012-08-28 2017-11-07 Continental Automotive Gmbh Circuit arrangement for inductively heating a fuel injector valve
US10281057B2 (en) 2012-08-28 2019-05-07 Continental Automotive Gmbh Circuit arrangement for inductively heating at least one fuel injector valve, and fuel injector arrangement comprising such a circuit arrangement

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