EP1798408B1 - Method for injecting fuel and system for injecting fuel - Google Patents

Method for injecting fuel and system for injecting fuel Download PDF

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Publication number
EP1798408B1
EP1798408B1 EP06123212A EP06123212A EP1798408B1 EP 1798408 B1 EP1798408 B1 EP 1798408B1 EP 06123212 A EP06123212 A EP 06123212A EP 06123212 A EP06123212 A EP 06123212A EP 1798408 B1 EP1798408 B1 EP 1798408B1
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Prior art keywords
fuel
injection
electrical
magnetic field
viscosity
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German (de)
French (fr)
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EP1798408A1 (en
Inventor
Marco Gangi
Udo Schulz
Thomas Proepper
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/12—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship providing a continuous cyclic delivery with variable pressure

Definitions

  • the invention relates to a fuel injection method and a fuel system for supplying an internal combustion engine with fuel, wherein in different injection phases different amounts of fuel are injected into a combustion chamber of the internal combustion engine.
  • the object of the invention is to improve the supply of an internal combustion engine with fuel in different injection phases, in which different amounts of fuel are injected.
  • the object is achieved in a fuel injection method according to the preamble of claim 1, characterized in that fuel is used with electro-rheological and / or magneto-rheological properties whose viscosity is selectively changed by applying an electric and / or magnetic field to the injection course Taxes.
  • the electro-rheological and / or magneto-rheological properties of the fuel may be caused, for example, by additives added to the fuel.
  • a preferred embodiment of the method is characterized in that the construction of the electrical and / or magnetic field, a piezoelectric actuator of a piezoelectric actuator and / or an actuator coil of a solenoid valve is used as an electrical and / or magnetic energy storage, which is also used to control a fuel injection device .
  • Fuel injectors with piezo actuators and magnetic coils are known.
  • the use of an existing piezoelectric actuator body, which is also referred to as a piezo stack, or a magnetic coil as an electrical energy storage provides the advantage that the energy also to build the electrical or magnetic field and thus can be used to change the viscosity of the fuel. Thus, this energy does not or only partially be returned to the controller.
  • a further preferred embodiment of the method is characterized in that in injection pauses between different injection phases at least one fuel passage opening is closed by a targeted change in the viscosity of the fuel.
  • a further preferred embodiment of the method is characterized in that the change in viscosity takes place in the injection pauses.
  • a further preferred embodiment of the method is characterized in that the change in viscosity takes place during the injection.
  • the change in viscosity during injection allows for direct injection jet forming and mixture formation.
  • a fuel injection system characterized in that the fuel has electro-rheological and / or magneto-rheological properties, and that the fuel injection means comprises an electrical means for applying an electric and / or magnetic field , by which the viscosity of the fuel is selectively changed to control the course of injection.
  • the electric and / or magnetic means are, for example, a plate or cylinder capacitor for forming an electric field or a magnetic coil for forming a magnetic field.
  • a preferred embodiment of the system is characterized in that the fuel injection device comprises a high-pressure channel, which, at least partially, is surrounded by the electrical device for applying the electric and / or magnetic field.
  • the high pressure passage preferably extends to a nozzle needle seat.
  • a further preferred embodiment of the system is characterized in that the fuel injection device comprises a nozzle channel from which fuel is injected into the combustion chamber of the internal combustion engine and which, at least partially, is surrounded by the electrical device for applying the electric and / or magnetic field.
  • the device for applying the electrical and / or magnetic field preferably continues from the high-pressure channel to the nozzle channel.
  • a further preferred embodiment of the system is characterized in that the electrical device for applying the electrical and / or magnetic field is connected to a control unit.
  • the control unit can in good time before the start of injection an electric and / or magnetic field with the desired Viscosity required field strength can be adjusted.
  • the invention relates to common rail injection systems having multiple injection phases per stroke per cylinder.
  • a main injection you want to inject a large amount of fuel in the shortest possible time in order to achieve the maximum possible torque.
  • a high rail pressure is desired.
  • a low rail pressure is desired.
  • For late post-injections for exhaust aftertreatment is at high rail pressure the risk of Schmierfilmabwaschung because the jet force is too large and the cylinder wall is sprayed in consequence of the downwardly moving piston. Therefore, a low rail pressure is desired here.
  • Electro-rheological or magneto-rheological properties of certain liquids or additives in or of diesel fuel are utilized.
  • Electro-rheological or magneto-rheological fluids change their viscosity when an electrical or magnetic field is applied.
  • the change in viscosity occurs within a very short time, for example one millisecond and less. By switching off the electrical or magnetic field, the effect recovers in the shortest possible time.
  • the use of these fluids provides the potential for optimal injection history forming and variable mixture formation between timely closely spaced injections.
  • the fuel injection system comprises a fuel injector with a high-pressure passage which extends to a nozzle seat / nozzle hole.
  • the electric field is realized by a suitable arrangement of metallic electrodes, for example a plate or cylinder condenser, directly around the high-pressure channel to the nozzle seat.
  • a magnetic field is realized by a suitable arrangement of elements or the respective ends of a magnetic circuit.
  • the electrode arrangement is continued into the nozzle channel.
  • the shape and dimensions of the electrodes are to be construed as a function of the following parameters: the flow rate of the fuel in the high-pressure channel with the nozzle open; the maximum injection duration; the minimum viscosity of the fuel and the duration of the viscosity change.
  • the control of the electrical and / or magnetic field is preferably carried out by an existing engine control unit, in which the injection management takes place.
  • the electric field can be set with the field strength required for the desired viscosity.
  • the alignment of the dipoles only takes a relatively short time, typically less than a millisecond.
  • the injection pauses between the different injection phases can be used to change the viscosity according to the desired injection jet pattern, the injection jet force, and the nozzle flow by controlling the electric field strength. Thereby, a continuous injection course formation is made possible.
  • control of the electric and / or magnetic field strength can also be used to use the temperature influence on the viscosity and thus on the constant activation duration of the injector (opening period of the nozzle needle) changed injection quantity to compensate for the influence of temperature.
  • the electrical and / or magnetic field strength can be set so high that the quasi-solid fuel closes the high-pressure channel and ultimately nothing is injected. If injection is desired, the electrical and / or magnetic field strength will be commensurate with the desired viscosity reduced so far that the fuel can flow through the nozzle, that is injected. To stop the injection, the electrical or magnetic field strength is increased again until the fuel is virtually fixed.
  • the narrow cross-sections of the nozzle holes and the associated adhesion effects and friction effects support the inventive principle, that is, the rheological medium does not have to be absolutely solid, but only clog the injection channel. Supporting the high-pressure channel, for example, uneven-line and nozzle bore, for example, be made conical to support the Verstopfungs free.
  • the magneto-rheological principle utilizes the physical effect of aligning the magnetic dipoles of the fuel molecules or fuel additives in the magnetic field, thereby reducing their mobility.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Feeding And Controlling Fuel (AREA)

Abstract

In different injection phases varying quantities of fuel are injected into the combustion chamber of a combustion engine. Fuel with electro-rheological or magneto-rheological properties is used whose viscosity can be deliberately changed by laying down an electric and/or magnetic field to control the course of the injection.

Description

Die Erfindung betrifft ein Kraftstoffeinspritzverfahren und ein Kraftstoffsystem zur Versorgung einer Brennkraftmaschine mit Kraftstoff, wobei in verschiedenen Einspritzphasen unterschiedliche Kraftstoffmengen in einen Brennraum der Brennkraftmaschine eingespritzt werden.The invention relates to a fuel injection method and a fuel system for supplying an internal combustion engine with fuel, wherein in different injection phases different amounts of fuel are injected into a combustion chamber of the internal combustion engine.

Stand der TechnikState of the art

Bei der Kraftstoffeinspritzung werden in unterschiedlichen Einspritzphasen unterschiedliche Kraftstoffmengen eingespritzt. Bei einer Voreinspritzung wird eine geringe Kraftstoffmenge genau dosiert eingespritzt. Dazu ist ein relativ niedriger Speicherdruck erforderlich. Bei einer Haupteinspritzung soll in kurzer Zeit viel Kraftstoff eingespritzt werden. Dazu ist ein hoher Speicherdruck erforderlich. Bei einer Nacheinspritzung ist eher ein niedriger Speicherdruck gewünscht. Die Bereitstellung von unterschiedlichen Speicherdrücken ist schwierig. Stattdessen ist es möglich, den Durchflussquerschnitt einer Kraftstoffeinspritzeinrichtung in verschiedenen Einspritzphasen zu ändern.In fuel injection, different amounts of fuel are injected in different injection phases. In a pre-injection, a small amount of fuel is injected precisely metered. This requires a relatively low memory pressure. With a main injection a lot of fuel should be injected in a short time. This requires a high memory pressure. In a post-injection is rather a low memory pressure desired. The provision of different memory pressures is difficult. Instead, it is possible to change the flow area of a fuel injector in different injection phases.

Ein Kraftstoffeinspritzverfahren gemäß dem Oberbegriff des Anspruchs 1 in der DE 197 35 232 gezeigt.A fuel injection method according to the preamble of claim 1 in the DE 197 35 232 shown.

Aufgabe der Erfindung ist es, die Versorgung einer Brennkraftmaschine mit Kraftstoff in verschiedenen Einspritzphasen, in denen unterschiedliche Kraftstoffmengen eingespritzt werden, zu verbessern.The object of the invention is to improve the supply of an internal combustion engine with fuel in different injection phases, in which different amounts of fuel are injected.

Vorteile der ErfindungAdvantages of the invention

Die Aufgabe ist bei einem Kraftstoffeinspritzverfahren gemäß dem Oberbegriff des Anspruchs 1 dadurch gelöst, dass Kraftstoff mit elektro-rheologischen und/oder magneto-rheologischen Eigenschaften verwendet wird, dessen Viskosität durch Anlegen eines elektrischen und/oder magnetischen Feldes gezielt verändert wird, um den Einspritzverlauf zu steuern. Die elektro-rheologischen und/oder magneto-rheologischen Eigenschaften des Kraftstoffs können zum Beispiel durch Additive hervorgerufen werden, die dem Kraftstoff beigemischt werden.The object is achieved in a fuel injection method according to the preamble of claim 1, characterized in that fuel is used with electro-rheological and / or magneto-rheological properties whose viscosity is selectively changed by applying an electric and / or magnetic field to the injection course Taxes. The electro-rheological and / or magneto-rheological properties of the fuel may be caused, for example, by additives added to the fuel.

Ein bevorzugtes Ausführungsbeispiel des Verfahrens ist dadurch gekennzeichnet, dass zum Aufbau des elektrischen und/oder magnetischen Feldes ein Piezoaktorkörper eines Piezoaktors und/oder eine Aktorspule eines Magnetventils als elektrischer und/oder magnetischer Energiespeicher verwendet wird, der beziehungsweise die auch zum Steuern einer Kraftstoffeinspritzeinrichtung verwendet wird. Kraftstoffinjektoren mit Piezoaktoren und Magnetspulen sind bekannt. Die Verwendung eines bereits vorhandenen Piezoaktorkörpers, der auch als Piezostack bezeichnet wird, oder einer Magnetspule als elektrischen Energiespeicher liefert den Vorteil, dass die Energie auch zum Aufbau des elektrischen beziehungsweise magnetischen Feldes und somit zur Viskositätsänderung des Kraftstoffs genutzt werden kann. Somit muss diese Energie nicht oder nur teilweise in das Steuergerät zurückgeführt werden.A preferred embodiment of the method is characterized in that the construction of the electrical and / or magnetic field, a piezoelectric actuator of a piezoelectric actuator and / or an actuator coil of a solenoid valve is used as an electrical and / or magnetic energy storage, which is also used to control a fuel injection device , Fuel injectors with piezo actuators and magnetic coils are known. The use of an existing piezoelectric actuator body, which is also referred to as a piezo stack, or a magnetic coil as an electrical energy storage provides the advantage that the energy also to build the electrical or magnetic field and thus can be used to change the viscosity of the fuel. Thus, this energy does not or only partially be returned to the controller.

Ein weiteres bevorzugtes Ausführungsbeispiel des Verfahrens ist dadurch gekennzeichnet, dass in Einspritzpausen zwischen verschiedenen Einspritzphasen mindestens eine Kraftstoffdurchtrittsöffnung durch eine gezielte Änderung der Viskosität des Kraftstoffs verschlossen wird.A further preferred embodiment of the method is characterized in that in injection pauses between different injection phases at least one fuel passage opening is closed by a targeted change in the viscosity of the fuel.

Ein weiteres bevorzugtes Ausführungsbeispiel des Verfahrens ist dadurch gekennzeichnet, dass die Änderung der Viskosität in den Einspritzpausen erfolgt.A further preferred embodiment of the method is characterized in that the change in viscosity takes place in the injection pauses.

Ein weiteres bevorzugtes Ausführungsbeispiel des Verfahrens ist dadurch gekennzeichnet, dass die Änderung der Viskosität während der Einspritzung erfolgt. Die Änderung der Viskosität während der Einspritzung ermöglicht eine direkte Einspritzstrahlformung und Gemischbildung.A further preferred embodiment of the method is characterized in that the change in viscosity takes place during the injection. The change in viscosity during injection allows for direct injection jet forming and mixture formation.

Die oben angegebene Aufgabe ist bei einem Kraftstoffeinspritzsystem gemäß dem Oberbegriff des Anspruchs 3 dadurch gelöst, dass der Kraftstoff elektro-rheologische und/oder magneto-rheologische Eigenschaften hat, und, dass die Kraftstoffeinspritzeinrichtung eine elektrische Einrichtung zum Anlegen eines elektrischen und/oder magnetischen Feldes aufweist, durch welche die Viskosität des Kraftstoffs gezielt veränderbar ist, um den Einspritzverlauf zu steuern. Bei der elektrischen und/oder magnetischen Einrichtung handelt es sich zum Beispiel um einen Platten- oder Zylinderkondensator zur Ausbildung eines elektrischen Feldes beziehungsweise um eine Magnetspule zur Ausbildung eines magnetischen Feldes.The above object is achieved in a fuel injection system according to the preamble of claim 3, characterized in that the fuel has electro-rheological and / or magneto-rheological properties, and that the fuel injection means comprises an electrical means for applying an electric and / or magnetic field , by which the viscosity of the fuel is selectively changed to control the course of injection. In the electric and / or magnetic means are, for example, a plate or cylinder capacitor for forming an electric field or a magnetic coil for forming a magnetic field.

Ein bevorzugtes Ausführungsbeispiel des Systems ist dadurch gekennzeichnet, dass die Kraftstoffeinspritzeinrichtung einen Hochdruckkanal umfasst, der, zumindest teilweise, von der elektrischen Einrichtung zum Anlegen des elektrischen und/oder magnetischen Feldes umgeben ist. Der Hochdruckkanal erstreckt sich vorzugsweise bis zu einem Düsennadelsitz.A preferred embodiment of the system is characterized in that the fuel injection device comprises a high-pressure channel, which, at least partially, is surrounded by the electrical device for applying the electric and / or magnetic field. The high pressure passage preferably extends to a nozzle needle seat.

Ein weiteres bevorzugtes Ausführungsbeispiel des Systems ist dadurch gekennzeichnet, dass die Kraftstoffeinspritzeinrichtung einen Düsenkanal umfasst, aus dem Kraftstoff in den Brennraum der Brennkraftmaschine eingespritzt wird und der, zumindest teilweise, von der elektrischen Einrichtung zum Anlegen des elektrischen und/oder magnetischen Feldes umgeben ist. Vorzugsweise setzt sich die Einrichtung zum Anlegen des elektrischen und/oder magnetischen Feldes vom Hochdruckkanal bis zum Düsenkanal fort.A further preferred embodiment of the system is characterized in that the fuel injection device comprises a nozzle channel from which fuel is injected into the combustion chamber of the internal combustion engine and which, at least partially, is surrounded by the electrical device for applying the electric and / or magnetic field. The device for applying the electrical and / or magnetic field preferably continues from the high-pressure channel to the nozzle channel.

Ein weiteres bevorzugtes Ausführungsbeispiel des Systems ist dadurch gekennzeichnet, dass die elektrische Einrichtung zum Anlegen des elektrischen und/oder magnetischen Feldes an ein Steuergerät angeschlossen ist. Über das Steuergerät kann rechtzeitig vor Einspritzbeginn ein elektrisches und/oder magnetisches Feld mit der für die gewünschte Viskosität erforderlichen Feldstärke eingestellt werden.A further preferred embodiment of the system is characterized in that the electrical device for applying the electrical and / or magnetic field is connected to a control unit. About the control unit can in good time before the start of injection an electric and / or magnetic field with the desired Viscosity required field strength can be adjusted.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Die Erfindung betrifft insbesondere Common-Rail-Einspritzsysteme mit mehreren Einspritzphasen pro Arbeitstakt pro Zylinder. Für eine Haupteinspritzung möchte man in möglichst kurzer Zeit eine große Kraftstoffmenge einspritzen, um das maximal mögliche Drehmoment zu erreichen. Demzufolge ist ein hoher Raildruck erwünscht. Für eine Voreinspritzung möchte man möglichst eine kleine Kraftstoffmenge genau dosiert einspritzen, um das Abgas nicht unnötig zu verschlechtern, aber ein Optimum für die Geräuschreduktion zu erreichen. Um den Einfluss der Toleranzen gering zu halten und ein Einspritzventil sicher öffnen und schließen zu können, möchte man größere Ansteuerdauern. Also ist ein niedriger Raildruck erwünscht. Für späte Nacheinspritzungen zur Abgasnachbehandlung besteht bei zu hohem Raildruck die Gefahr der Schmierfilmabwaschung, da die Strahlkraft zu groß wird und die Zylinderwand in Folge des sich nach unten bewegenden Kolbens besprüht wird. Daher ist hier ein niedriger Raildruck erwünscht.More particularly, the invention relates to common rail injection systems having multiple injection phases per stroke per cylinder. For a main injection, you want to inject a large amount of fuel in the shortest possible time in order to achieve the maximum possible torque. As a result, a high rail pressure is desired. For a pre-injection you want to inject as small a quantity of fuel as possible dosed precisely, so as not to unnecessarily degrade the exhaust gas, but to achieve an optimum for the noise reduction. In order to keep the influence of tolerances low and to be able to safely open and close an injection valve, one would like to have longer activation periods. So a low rail pressure is desired. For late post-injections for exhaust aftertreatment is at high rail pressure the risk of Schmierfilmabwaschung because the jet force is too large and the cylinder wall is sprayed in consequence of the downwardly moving piston. Therefore, a low rail pressure is desired here.

Gemäß einem wesentlichen Aspekt der vorliegenden Erfindung werden die elektro-rheologischen oder magneto-rheologischen Eigenschaften von bestimmten Flüssigkeiten beziehungsweise Additiven im beziehungsweise von Dieselkraftstoff genutzt. Elektro-rheologische oder magneto-rheologische Flüssigkeiten ändern ihre Viskosität beim Anlegen eines elektrischen beziehungsweise magnetischen Feldes.According to one essential aspect of the present invention, the electro-rheological or magneto-rheological properties of certain liquids or additives in or of diesel fuel are utilized. Electro-rheological or magneto-rheological fluids change their viscosity when an electrical or magnetic field is applied.

Die Änderung der Viskosität geschieht innerhalb kürzester Zeit, zum Beispiel einer Millisekunde und weniger. Durch Abschalten des elektrischen beziehungsweise magnetischen Feldes hebt sich der Effekt in kürzester Zeit wieder auf. Die Verwendung dieser Flüssigkeiten liefert die Möglichkeit einer optimalen Einspritzverlaufsformung und einer variablen Gemischbildung zwischen zeitlich eng aufeinander folgenden Einspritzungen.The change in viscosity occurs within a very short time, for example one millisecond and less. By switching off the electrical or magnetic field, the effect recovers in the shortest possible time. The use of these fluids provides the potential for optimal injection history forming and variable mixture formation between timely closely spaced injections.

Das erfindungsgemäße Kraftstoffeinspritzsystem umfasst einen Kraftstoffinjektor mit einem Hochdruckkanal, der bis zu einem Düsensitz/Düsenloch reicht.The fuel injection system according to the invention comprises a fuel injector with a high-pressure passage which extends to a nozzle seat / nozzle hole.

Bei dem elektro-rheologischen Prinzip wird der physikalische Effekt genutzt, dass sich die elektrischen Dipole der Kraftstoff-Ölmoleküle oder Kraftstoff-Additive im elektrischen und/oder magnetischen Feld ausrichten und dadurch in ihrer Beweglichkeit behindert sind. Das elektrische Feld wird durch eine geeignete Anordnung metallischer Elektroden, zum Beispiel eines Platten- oder Zylinder-Kondensators, direkt um den Hochdruckkanal bis zum Düsensitz realisiert. Ein magnetisches Feld wird durch eine geeignete Anordnung von Elementen oder den jeweiligen Enden eines magnetischen Kreises realisiert.In the electro-rheological principle of the physical effect is used that align the electric dipoles of the fuel oil molecules or fuel additives in the electric and / or magnetic field and are thus hindered in their mobility. The electric field is realized by a suitable arrangement of metallic electrodes, for example a plate or cylinder condenser, directly around the high-pressure channel to the nozzle seat. A magnetic field is realized by a suitable arrangement of elements or the respective ends of a magnetic circuit.

Gemäß einer Ausführungsform ist die Elektrodenanordnung bis in den Düsenkanal fortgesetzt. Die Form und die Abmessungen der Elektroden sind in Abhängigkeit von den folgenden Parametern auszulegen: Die Fließgeschwindigkeit des Kraftstoffs im Hochdruckkanal bei offener Düse; die maximale Einspritzdauer; die minimale Viskosität des Kraftstoffs und die Zeitdauer der Viskositätsänderung. Die Steuerung des elektrischen und/oder magnetischen Felds erfolgt vorzugsweise durch ein vorhandenes Motor-Steuergerät, in dem das Einspritzmanagement erfolgt. So kann rechtzeitig vor der Ansteuerung (Einspritzbeginn) das elektrische Feld mit der für die gewünschte Viskosität erforderlichen Feldstärke eingestellt werden. Die Ausrichtung der Dipole benötigt nur eine relativ kurze Zeit, typischerweise kleiner als eine Millisekunde. So können die Einspritzpausen zwischen den verschiedenen Einspritzphasen dazu genutzt werden, die Viskosität entsprechend dem gewünschten Einspritzstrahlbild, der Einspritzstrahlkraft, und dem Düsendurchfluss durch Steuerung/Regelung der elektrischen Feldstärke zu verändern. Dadurch wird eine kontinuierliche Einspritzverlaufsformung ermöglicht.According to one embodiment, the electrode arrangement is continued into the nozzle channel. The shape and dimensions of the electrodes are to be construed as a function of the following parameters: the flow rate of the fuel in the high-pressure channel with the nozzle open; the maximum injection duration; the minimum viscosity of the fuel and the duration of the viscosity change. The control of the electrical and / or magnetic field is preferably carried out by an existing engine control unit, in which the injection management takes place. Thus, in good time before the activation (start of injection), the electric field can be set with the field strength required for the desired viscosity. The alignment of the dipoles only takes a relatively short time, typically less than a millisecond. Thus, the injection pauses between the different injection phases can be used to change the viscosity according to the desired injection jet pattern, the injection jet force, and the nozzle flow by controlling the electric field strength. Thereby, a continuous injection course formation is made possible.

Die Regelung der elektrischen und/oder magnetischen Feldstärke kann auch dazu benutzt werden, den Temperatureinfluss auf die Viskosität und damit auf die bei konstanter Ansteuerdauer des Injektors (Öffnungsdauer der Düsennadel) veränderte Einspritzmenge zur Kompensation des Temperatureinflusses zu nutzen.The control of the electric and / or magnetic field strength can also be used to use the temperature influence on the viscosity and thus on the constant activation duration of the injector (opening period of the nozzle needle) changed injection quantity to compensate for the influence of temperature.

In den Einspritzpausen kann die elektrische und/oder magnetische Feldstärke so hoch eingestellt werden, dass der quasi feste Kraftstoff den Hochdruckkanal verschließt und letztlich nichts eingespritzt wird. Wenn eine Einspritzung erwünscht wird, dann wird die elektrische und/oder magnetische Feldstärke entsprechend der gewünschten Viskosität soweit reduziert, dass der Kraftstoff durch die Düse fließen kann, also eingespritzt wird. Um die Einspritzung zu beenden, wird die elektrische beziehungsweise magnetische Feldstärke wieder soweit erhöht, bis der Kraftstoff quasi fest ist.During the injection breaks, the electrical and / or magnetic field strength can be set so high that the quasi-solid fuel closes the high-pressure channel and ultimately nothing is injected. If injection is desired, the electrical and / or magnetic field strength will be commensurate with the desired viscosity reduced so far that the fuel can flow through the nozzle, that is injected. To stop the injection, the electrical or magnetic field strength is increased again until the fuel is virtually fixed.

Die engen Querschnitte der Düsen-Bohrungen und die damit verbundenen Adhäsionseffekte und Reibungseffekte unterstützen das erfindungsgemäße Prinzip, das heißt, dass rheologische Medium muss nicht absolut fest sein, sondern nur den Einspritzkanal verstopfen. Unterstützend kann der Hochdruckkanal zum Beispiel ungradlinig und Düsenbohrung zum Beispiel konisch ausgeführt werden, um den Verstopfungseffekt zu unterstützen.The narrow cross-sections of the nozzle holes and the associated adhesion effects and friction effects support the inventive principle, that is, the rheological medium does not have to be absolutely solid, but only clog the injection channel. Supporting the high-pressure channel, for example, uneven-line and nozzle bore, for example, be made conical to support the Verstopfungseffekt.

Bei dem magneto-rheologischen Prinzip wird der physikalische Effekt genutzt, dass sich die magnetischen Dipole der Kraftstoff-Moleküle oder der Kraftstoff-Additive im magnetischen Feld ausrichten, wodurch ihre Beweglichkeit verringert wird.The magneto-rheological principle utilizes the physical effect of aligning the magnetic dipoles of the fuel molecules or fuel additives in the magnetic field, thereby reducing their mobility.

Claims (9)

  1. Method for injecting fuel for supplying an internal combustion engine with fuel, with different fuel quantities being injected into a combustion chamber of the internal combustion engine in different injection phases, characterized in that fuel with electro-rheological and/or magneto-rheological properties is used, the viscosity of which is varied in a targeted fashion by applying an electrical and/or magnetic field in order to control the injection profile.
  2. Method for injecting fuel according to Claim 1, characterized in that a piezoelectric actuator body of a piezoelectric actuator and/or an actuator coil of a solenoid valve is used as an electrical and/or magnetic energy store for building up the electrical and/or magnetic field, which piezoelectric actuator body and/or actuator coil is also used for controlling a fuel injection device.
  3. Method for injecting fuel according to one of the preceding claims, characterized in that, in injection intervals between different injection phases, at least one fuel passage opening is closed off by means of a targeted change in the viscosity of the fuel.
  4. Method for injecting fuel according to one of the preceding claims, characterized in that the change in the viscosity takes place in the injection intervals.
  5. Method for injecting fuel according to one of the preceding claims, characterized in that the change in the viscosity takes place during the injection.
  6. Fuel injection system for supplying an internal combustion engine with fuel, having at least one fuel injection device from which different fuel quantities are injected into a combustion chamber of the internal combustion engine in different injection phases, characterized in that the fuel has electro-rheological and/or magneto-rheological properties and in that the fuel injection device has an electrical device for applying an electrical and/or magnetic field, by means of which electrical device the viscosity of the fuel can be varied in a targeted fashion in order to control the injection profile.
  7. Fuel injection system according to Claim 6, characterized in that the fuel injection device comprises a high-pressure duct which is at least partially surrounded by the electrical device for applying the electrical and/or magnetic field.
  8. Fuel injection system according to Claim 6 or 7, characterized in that the fuel injection device comprises a nozzle duct from which fuel is injected into the combustion chamber of the internal combustion engine and which is at least partially surrounded by the electrical device for applying the electrical and/or magnetic field.
  9. Fuel injection system according to one of Claims 6 to 8, characterized in that the electrical device for applying the electrical and/or magnetic field is connected to a control unit.
EP06123212A 2005-12-16 2006-10-31 Method for injecting fuel and system for injecting fuel Not-in-force EP1798408B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005060273A DE102005060273A1 (en) 2005-12-16 2005-12-16 Fuel injection method and fuel injection system

Publications (2)

Publication Number Publication Date
EP1798408A1 EP1798408A1 (en) 2007-06-20
EP1798408B1 true EP1798408B1 (en) 2008-09-10

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Application Number Title Priority Date Filing Date
EP06123212A Not-in-force EP1798408B1 (en) 2005-12-16 2006-10-31 Method for injecting fuel and system for injecting fuel

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EP (1) EP1798408B1 (en)
AT (1) ATE408059T1 (en)
DE (2) DE102005060273A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4301614C1 (en) * 1993-01-22 1994-06-01 Deutsche Aerospace Liq. propellant-fuelled missile storage - involves propellant modification to form electro-rheological fluid or liq. crystalline phase
DE19735232A1 (en) * 1997-08-14 1999-02-18 Bosch Gmbh Robert Movement damping method for IC engine fuel injection valve
DE19954864A1 (en) * 1999-11-15 2001-05-23 Bosch Gmbh Robert Control valve and fuel injector provided with such a control valve
DE10030079A1 (en) * 2000-06-19 2002-01-24 Schenck Ag Carl Cylinder piston arrangement based on electro- and magneto-rheological liquids, has second volume-changing chamber that produces bias force against admission direction of pressure medium in first working chamber

Also Published As

Publication number Publication date
ATE408059T1 (en) 2008-09-15
DE502006001540D1 (en) 2008-10-23
DE102005060273A1 (en) 2007-06-21
EP1798408A1 (en) 2007-06-20

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