EP3655643B1 - Device for controlling an injector - Google Patents

Device for controlling an injector Download PDF

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Publication number
EP3655643B1
EP3655643B1 EP18745562.1A EP18745562A EP3655643B1 EP 3655643 B1 EP3655643 B1 EP 3655643B1 EP 18745562 A EP18745562 A EP 18745562A EP 3655643 B1 EP3655643 B1 EP 3655643B1
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EP
European Patent Office
Prior art keywords
valve
connection
injector
accordance
space
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EP18745562.1A
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German (de)
French (fr)
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EP3655643A1 (en
Inventor
Norbert SCHÖFBÄNKER
Verena KÖGEL
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Liebherr Components Deggendorf GmbH
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Liebherr Components Deggendorf GmbH
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Classifications

    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0045—Three-way valves
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0056—Throttling valves, e.g. having variable opening positions throttling the flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0075—Stop members in valves, e.g. plates or disks limiting the movement of armature, valve or spring
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member

Definitions

  • the present invention relates to a device for controlling an injector which can be used, for example, as a fuel injection valve.
  • An injector has a nozzle needle (also: injector needle), which allows fuel that has been subjected to high pressure to emerge to the outside when an outlet hole of the injector is released.
  • this nozzle needle acts like a plug which, when lifted, causes the fuel allows. Accordingly, it is therefore necessary to raise this needle at relatively short time intervals and, after a short time, to let it slide back into the outlet opening again.
  • Hydraulic servo valves controlled by electromagnetic valves are used to trigger the movement of this nozzle needle. The servo valves are required for the controlled opening and closing of the nozzle needle. This makes it possible to determine the start of injection, the duration of injection and the end of injection.
  • servo valves which control the nozzle needle and are themselves controlled via an electromagnetic valve.
  • a pressure level is built up in a control chamber which interacts with the nozzle needle with the aid of the fuel which is available under high pressure and which acts on the nozzle needle in the closing direction.
  • This control chamber is typically connected to the high-pressure area of the fuel via an inlet throttle.
  • this control chamber has a small closable outlet throttle from which the fuel can escape. If he does this, the pressure in the control chamber and the closing force acting on the nozzle needle are reduced. This causes the nozzle needle to move, which opens the outlet opening at the injector tip.
  • the servo valve includes the inlet throttle, the control chamber and the outlet throttle.
  • the outlet throttle of the control chamber is selectively closed or opened with the aid of an electromagnetic valve or another suitable valve.
  • the controlled opening of this outlet throttle in combination with the inlet throttle increases the pressure in the control room of the valve. As explained briefly above, this pressure is then responsible for the opening and closing of the nozzle needle.
  • a known from the prior art fuel injection valve with all the features of the preamble of claim 1 shows the DE 10 2015 113 980 A1 .
  • the aim of the present invention is to optimize the opening and closing of the nozzle needle independently of one another.
  • the valve is designed to create a direct connection between the high-pressure side and the control chamber when the pressure level in the passage chamber is equal to or greater than a predetermined value or when a specific ratio of the pressure in the control chamber to the Pressure in the passage space is fallen below.
  • valve described herein can be the servo valve considered in more detail in the introductory part of the description.
  • the valve of the present invention responds differently.
  • the pressure in the closed passage space increases through the inlet via the first connection, the valve is designed to create a direct connection between the high-pressure area of the fuel and the control space.
  • the injection quantity of the fuel can be better determined since the transition phase of the injector from an open to a closed state in which no fuel is discharged through the injector is faster.
  • the direct connection between the high-pressure area and the control chamber preferably does not run via the through-chamber. Rather, the direct connection is a coupling of the fuel, which is under high pressure, to the control chamber.
  • the first connection is provided with the aid of an inlet throttle, which represents a throttled connection from the passage space to the high-pressure area of the injector, this connection preferably being present independently of a state of the valve.
  • passage space is not closed, i.e. the anchor element is not placed on an opening of the passage space, fluid under high pressure (such as fuel) escapes in the direction of the low-pressure area released by the anchor element, so that a continuous inflow through the inlet throttle also results in a pressure decrease in the passage space or in the control room cannot counteract in such a state.
  • high pressure such as fuel
  • the valve is also designed to create the direct connection between the high-pressure area and the control space only when the pressure level in the passage space is equal to or greater than a predetermined value, whereas otherwise this connection is closed.
  • the direct connection between the high-pressure area of the injector and the control chamber is therefore only established by the valve when a specific pressure level has been reached in the through-chamber. If, due to the connection of the control chamber to the high-pressure area, the pressure level in the control chamber has equalized that of the passage chamber, the valve is optionally designed to close the direct connection again.
  • the valve is designed to create a direct connection between the high-pressure side and the control chamber when the pressure level in the passage chamber is equal to or greater than a predetermined value, this predetermined value being based on a difference in pressure between the passage room and the control room.
  • a predetermined value being based on a difference in pressure between the passage room and the control room.
  • the valve establishes the direct connection when the pressure in the passage space is greater than a pressure prevailing in the control space.
  • the second connection is a throttled connection and/or the direct connection is an unthrottled connection.
  • a throttled connection is understood to mean that a fluid flowing through such a line is restricted in its flow, so that a pressure equalization via such a throttled connection takes a certain amount of time.
  • an unthrottled connection it is assumed that there are no flow obstacles for the fluid in order not to prevent pressure equalization of the fluid via such a connection.
  • the valve comprises a valve guide, which is arranged between the other of the two sides of the passage space and the control space, and a valve insert, which is slidably mounted in the valve guide.
  • the valve guide has a channel which, in a first position of the sliding valve insert in the Valve guide does not produce a direct fluid connection between the high-pressure region and the control chamber and produces a direct fluid connection between the high-pressure region and the control chamber in a second position of the displaceable valve insert in the valve guide. Accordingly, there is no direct connection between the high-pressure area and the control chamber in the first position of the valve insert. A particularly simple implementation of the valve is thus achieved.
  • valve insert moves at least temporarily into the second position, as a result of which the two control spaces are separated.
  • valve insert moves into the first position when the pressure level in the passage space falls below a predetermined level.
  • the valve insert moves into the first position when a pressure difference between the passage space and the control space falls below a predetermined value. For example, when the pressure in the control chamber is higher than the pressure level in the passage chamber, the valve insert can be moved into the first position.
  • the movement of the valve insert occurs automatically due to the different pressures in the control chamber and the passage chamber, since these exert a certain force on the valve insert on the respective side of the valve insert (side in the passage chamber or side in the control chamber) and this corresponds to the prevailing pressure levels in the A shift in one direction can be made in connection with the effective pressure area of the valve insert.
  • it also has a stop element which increases the stroke of the valve insert during a movement limited from the first layer to the second layer. This makes it possible to make the manufacturing tolerances on the components more generous and to reduce the costs of the claimed device overall.
  • the stop element limiting the stroke of the valve insert brings about the advantageous circumstance that the return path of the valve insert into the first position is reduced, so that activation of the valve can be achieved more quickly during the next injection.
  • the stop element is a disc-shaped body that has one or more through openings.
  • stop element is attached to the valve guide, preferably welded.
  • stop element it is possible for the stop element to be arranged in the control chamber or on the side of the valve guide pointing towards the control chamber.
  • the optional provision of at least one through-opening in the stop element serves for the fuel to flow through to the control chamber or to the second connection.
  • the device also has a restoring element which applies a force to the valve insert which forces it from the second position into the first position.
  • a restoring element which applies a force to the valve insert which forces it from the second position into the first position.
  • the restoring element is an elastic element, preferably a spring or a spiral spring, which the valve insert with a certain force in the first position.
  • the elastic element is preferably arranged on a side of the valve insert that faces the control chamber.
  • the valve is preferably a 3/2-way valve because, compared to the 2/2-way valves used in the prior art, it has an additional fuel channel in the high-pressure area of the injector, which has a direct fluid connection to the control chamber in a specific state of the valve.
  • FIG. 1 shows a partial sectional view of a schematic representation of an injector 2.
  • the movable injector needle 6 which can be moved in the direction of the valve 7 arranged above it. If the injector needle 6 is moved toward the valve 7, fuel flows out at the end of the injector (not shown). In the other case, in which the injector needle 6 is arranged in its place away from the valve 7, no fuel flows out of the injector 2.
  • a control chamber 5 Located in the direct vicinity of the injector needle 6 between the valve 7 is a control chamber 5 in which a variable pressure can be generated.
  • the valve 7 with its through-opening 3 is directly connected to the closure member or anchor element 4, which can close the through-opening 3 in a fluid-tight manner. A certain pressure is required for this, which forces the anchor element 4 in the direction of the through-opening 3 . This is achieved with the help of the spring interacting with the anchor element 4 . If one now wants to lift the armature element 4 from the through-opening 3 so that there is a pressure change in the through-opening 3 or the control chamber 5, a force pulling the armature element 4 away from the through-opening 3 is generated with the aid of an electromagnet.
  • An inner magnet pole 23 and an outer magnet pole 22 are provided in the injector housing 21, which together with a coil form an electromagnet for controlling the closure element.
  • FIG 2 shows an enlarged view of the device 1 according to the invention, in particular of the valve 7.
  • the sealing seat 41 ensures a tight connection.
  • a passage opening 32 is accordingly closed with the aid of the anchor element 4 .
  • the passage space 3 also has an inlet throttle 8 which allows fuel under high pressure to flow into the passage space 3 .
  • the valve insert 72 is arranged such that it can move relative to the valve guide 71 . When certain pressures are present in the control chamber 5 or the passage chamber 3, the valve insert 72 can accordingly be moved toward or away in the direction of the passage opening 3.
  • Figure 3a shows the state in which the pilot valve, ie the opening of the armature element 4 with respect to the through opening 3, is in a closed state and accordingly the injector 2 does not inject fuel.
  • the through opening is provided in what is known as a seat plate 31 .
  • the anchor element 4 separates the high-pressure area HP from the low-pressure area of a fuel.
  • FIG. 12 shows a state in which the pilot valve is open and injection is made by the injector 2.
  • Opening the pilot valve means that the armature element 4 is raised, so that fuel can flow from the high-pressure area HP to the low-pressure area LP out of the passage space 3 . Accordingly, lifting the anchor element 4 enables a direct fluid connection between the passage space 3 and the area surrounding the anchor element 4 . Accordingly, fuel flows out of the passage space 3 in the direction of the anchor element 4. This also means that the fuel in the control space 5 under high pressure flows through the discharge throttle 9 towards the low-pressure area of the injector due to the existing pressure difference. This leads to a pressure reduction above the injector needle 6, as a result of which the resulting reduction in the pressure on the injector needle body 6 leads to the injector needle 6 being lifted out of its nozzle seat and an injection taking place.
  • the inlet throttle 8 and the outlet throttle 9 and the passage space 3 are dimensioned so that the processes described take place.
  • 3c shows the state in which the pilot valve is just closing and injection from the injector 2 is still present.
  • 3d shows a state in which the pilot valve is closed, the injector needle 6 closes and the injection of the injector 2 is terminated.
  • Fig.3d also a sectional view of the figs 3a-3c discussed area, however, in 3d shown a different section plane to better represent the features of the invention.
  • the anchor element 4 has only just been brought into a sealing position relative to the opening of the passage space 3 , so that fuel which is under high pressure now flows into the passage space 3 via the inlet throttle 8 .
  • the pressure level in the passage space 3 thus increases, so that due to the very high pressure in the passage space 3 compared to the control chamber 5, a movement of the valve insert 72 away from the passage space 3 is generated. This movement creates a direct, throttle-free connection from the high-pressure area HP of the fuel to the control chamber 5.
  • FIG. 12 shows a sectional view of another embodiment of the present invention.
  • a spiral spring 13 can be seen, which is used to return the valve insert 72 to its starting position after an injection. If the pressure in the control chamber is equal to the pressure prevailing in the high-pressure area, the valve insert 72 does not remain in the position in which there is a fluid connection through the channel 10 provided in the valve guide, but is returned to its initial position with the aid of the spring 13 . This brings with it the advantage that the valve insert 72 does not first have to overcome the valve lift when the next injection is activated, and the reaction time of the injector is shortened as a result.
  • FIG. 13 shows another embodiment of the present invention, in which a stop member 11 in the form of a disc-shaped body is provided to limit the stroke of the valve core 72.
  • the stop member 11 is attached to the valve guide 71 by laser welding.
  • the stop element 11 the manufacturing tolerances on the components can be made more generous.
  • the stop element 11 has through openings 12 which are used to allow fuel to flow through the stop element 11 .
  • valve guide 71 shows four different embodiments for the outer shape of the valve guide 71. If this is now inserted into a bore which is flush with the circular outer sections of the valve guide 71, the flattened sections can serve to guide fuel past the side of the sleeve.
  • Fig.7 shows a top view of two stop elements 11 that can be used to limit the stroke of the valve insert 72. It can be seen that each of the two stop elements 11 has at least one through opening 12.
  • the function of two components is combined in one component.
  • the blank of the valve 7 is preferably designed as MIM (Metal Injection Molding) and already has all the bores except for the outlet throttle 9 and the inlet throttle 8, which are subsequently eroded.
  • a metal injection molding process is a manufacturing process in which a green body is produced by injection molding and then sintered in a furnace. As a result, very complex component geometries can be implemented cost-effectively and machining on the component can be reduced to a minimum.

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

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zum Steuern eines Injektors, der beispielsweise als Kraftstoffeinspritzventil genutzt werden kann.The present invention relates to a device for controlling an injector which can be used, for example, as a fuel injection valve.

In Brennkraftmaschinen wie Dieselmotoren oder auch Benzinmotoren wird in der Regel über einen Injektor Kraftstoff mit einer bestimmten Menge und für eine bestimmte Zeitdauer in einen Brennraum eingespritzt. Dabei ist es aufgrund der sehr geringen Einspritzdauern, die im Mikrosekundenbereich liegen, herausfordernd die genaue Menge des mit dem Injektor einzuspritzenden Kraftstoffs zu bestimmen. Dabei gibt es auch die kontinuierlichen Bestrebungen den durch einen Injektor in Anspruch genommenen Bauraum zu verkleinern, um insgesamt die Abmaße einer Brennkraftmaschine zu reduzieren.In internal combustion engines such as diesel engines or gasoline engines, fuel is usually injected into a combustion chamber via an injector in a specific quantity and for a specific period of time. Due to the very short injection durations, which are in the microsecond range, it is challenging to determine the exact quantity of fuel to be injected with the injector. There are also continuous efforts to reduce the installation space taken up by an injector in order to reduce the overall dimensions of an internal combustion engine.

Für das Verständnis der Erfindung ist die grundlegende Funktionalität eines Injektors hilfreich, die nachfolgend in Teilen näher betrachtet werden soll. Ein Injektor verfügt über eine Düsennadel (auch: Injektornadel), die einen mit einem hohen Druck beaufschlagten Kraftstoff bei Freigeben eines Austrittslochs des Injektors nach außen treten lässt. Diese Düsennadel wirkt im Zusammenspiel mit dieser Austrittsöffnung wie ein Pfropfen, der bei einem Anheben ein Austreten des Kraftstoffs ermöglicht. Demnach ist es also erforderlich, diese Nadel in relativ kurzen Zeitabständen anzuheben und nach einer kurzen Zeit erneut in die Austrittsöffnung zurückgleiten zu lassen. Für das Auslösen der Bewegung dieser Düsennadel werden hydraulische Servoventile verwendet, die durch Elektromagnetventile gesteuert werden. Die Servoventile sind für das kontrollierte Öffnen und Schließen der Düsennadel erforderlich. Dadurch ist es möglich, den Einspritzbeginn, die Einspritzdauer und das Einspritzende zu bestimmen.The basic functionality of an injector is helpful for understanding the invention, parts of which are to be considered in more detail below. An injector has a nozzle needle (also: injector needle), which allows fuel that has been subjected to high pressure to emerge to the outside when an outlet hole of the injector is released. In interaction with this outlet opening, this nozzle needle acts like a plug which, when lifted, causes the fuel allows. Accordingly, it is therefore necessary to raise this needle at relatively short time intervals and, after a short time, to let it slide back into the outlet opening again. Hydraulic servo valves controlled by electromagnetic valves are used to trigger the movement of this nozzle needle. The servo valves are required for the controlled opening and closing of the nozzle needle. This makes it possible to determine the start of injection, the duration of injection and the end of injection.

Aufgrund der hohen Einspritzdrücke von über 2500 bar ist es nicht möglich, die Düsennadel direkt mit Hilfe eines Magnetventils anzusteuern (= zu bewegen). Hierbei wären die erforderlichen Kräfte zum Öffnen und Schließen der Düsennadel zu groß, sodass ein solches Verfahren nur mit Hilfe von sehr großen Elektromagneten realisierbar wäre. Eine solche Konstruktion scheidet aber aufgrund des nur beschränkt zur Verfügung stehenden Bauraums in einen Motor aus.Due to the high injection pressures of over 2500 bar, it is not possible to control (= move) the nozzle needle directly using a solenoid valve. In this case, the forces required to open and close the nozzle needle would be too great, so that such a method could only be implemented with the help of very large electromagnets. However, such a design is ruled out in an engine due to the limited installation space available.

Typischerweise werden anstelle der direkten Ansteuerung sogenannte Servoventile verwendet, die die Düsennadel ansteuern und selbst über ein Elektromagnetventil gesteuert werden. Dabei wird in einem mit der Düsennadel zusammenwirkenden Steuerraum mit Hilfe des unter hohem Druck zur Verfügung stehenden Kraftstoffs ein Druckniveau aufgebaut, das auf die Düsennadel in Verschlussrichtung wirkt. Dieser Steuerraum ist typischerweise über eine Zulaufdrossel mit dem Hochdruckbereich des Kraftstoffs verbunden. Ferner weist dieser Steuerraum eine kleine verschließbare Ablaufdrossel auf, aus der der Kraftstoff entweichen kann. Tut er dies, ist der Druck in dem Steuerraum und die auf die Düsennadel wirkende Verschlusskraft verringert. Dadurch kommt es zu einer Bewegung der Düsennadel, welche die Austrittsöffnung an der Injektorspitze freigibt. Das Servoventil umfasst dabei die Zulaufdrossel, den Steuerraum wie auch die Ablaufdrossel. Um nun die Bewegung der Düsennadel steuern zu können, wird die Ablaufdrossel des Steuerraums mit Hilfe eines Elektromagnetventils oder einem anderen geeigneten Ventil wahlweise geschlossen oder geöffnet. Durch die kontrollierte Öffnung dieser Ablaufdrossel wird in Kombination mit der Zulaufdrossel der Druck im Steuerraum des Ventils bestimmt. Dieser Druck ist dann, wie bereits oben kurz erläutert, für das Öffnen und Schließen der Düsennadel verantwortlich.Typically, instead of direct control, so-called servo valves are used, which control the nozzle needle and are themselves controlled via an electromagnetic valve. In this case, a pressure level is built up in a control chamber which interacts with the nozzle needle with the aid of the fuel which is available under high pressure and which acts on the nozzle needle in the closing direction. This control chamber is typically connected to the high-pressure area of the fuel via an inlet throttle. Furthermore, this control chamber has a small closable outlet throttle from which the fuel can escape. If he does this, the pressure in the control chamber and the closing force acting on the nozzle needle are reduced. This causes the nozzle needle to move, which opens the outlet opening at the injector tip. The servo valve includes the inlet throttle, the control chamber and the outlet throttle. In order to be able to control the movement of the nozzle needle, the outlet throttle of the control chamber is selectively closed or opened with the aid of an electromagnetic valve or another suitable valve. The controlled opening of this outlet throttle in combination with the inlet throttle increases the pressure in the control room of the valve. As explained briefly above, this pressure is then responsible for the opening and closing of the nozzle needle.

Um die Einspritzung zu beenden und die Ablaufdrossel des Ventils zwischen den Einspritzungen geschlossen zu halten, ist eine bestimmte Federkraft erforderlich, welche ein Verschlussglied (im Fachjargon auch: Anker) gegen die Ablaufdrossel gedrückt, um das Ablaufen von Kraftstoff und dabei das Vermindern von Druck in dem Steuerraum aus der Ablaufdrossel zu verhindern. Zum Öffnen hingegen muss die eingestellte Federkraft, mit der das Verschlussglied gegen die Dichtstelle der Ablaufdrossel gepresst wird, überwunden werden, damit das Verschlussglied die Ablaufdrossel möglichst schnell freigibt. Typische erforderliche Einschaltzeiten, also die Zeit vom Beginn der Bestromung bis zum Anschlagen des Verschlussglieds an einer oberen Hubbegrenzung von solchen Magnetventilen liegen im Bereich von ca. 200 Mikrosekunden.In order to end the injection and to keep the outlet throttle of the valve closed between the injections, a certain spring force is required, which presses a closing element (in technical jargon also: anchor) against the outlet throttle in order to prevent the fuel from draining and thereby reducing the pressure in the to prevent the control room from the outlet throttle. To open, on the other hand, the set spring force, with which the closure member is pressed against the sealing point of the outlet throttle, must be overcome so that the closure member releases the outlet throttle as quickly as possible. Typical switch-on times required, that is to say the time from the start of the energization until the closing element hits an upper stroke limitation of such solenoid valves, are in the range of approx. 200 microseconds.

Ein aus dem Stand der Technik bekanntes Kraftstoffeinspritzventil mit sämtlichen Merkmalen aus dem Oberbegriff des Anspruchs 1 zeigt die DE 10 2015 113 980 A1 .A known from the prior art fuel injection valve with all the features of the preamble of claim 1 shows the DE 10 2015 113 980 A1 .

Dabei ist es das Ziel der vorliegenden Erfindung, das Öffnen und das Schließen der Düsennadel unabhängig voneinander zu optimieren.The aim of the present invention is to optimize the opening and closing of the nozzle needle independently of one another.

Dies gelingt der Erfindung mit einer Vorrichtung nach Anspruch 1. Dabei weist diese Vorrichtung zum Steuern eines Injektors unter anderem einen Durchgangsraum, der in einer seiner beiden Seiten durch ein Ankerelement (=Verschlussglied) verschließbar ist, um damit wahlweise einen Hochdruckbereich von einem Niederdruckbereich des Injektors zu trennen, einen Steuerraum zum Ausüben eines variablen Drucks, eine Injektorkomponente, vorzugsweise eine Injektornadel (=Düsennadel), ein Ventil, das zwischen einer anderen der beiden Seiten des Durchgangsraums und dem Steuerraum angeordnet ist, eine erste Verbindung, die den Hochdruckbereich des Injektors mit dem Durchgangsraum verbindet und eine zur ersten Verbindung verschiedene zweite Verbindung, die den Durchgangsraum mit dem Steuerraum verbindet, auf. Ferner ist unter anderem vorgesehen, dass das Ventil dazu ausgelegt ist, eine direkte Verbindung zwischen der Hochdruckseite und dem Steuerraum zu erstellen, wenn das Druckniveau in den Durchgangsraum gleich oder größer einem vorbestimmten Wert ist oder wenn ein bestimmtes Verhältnis des Drucks in dem Steuerraum zu dem Druck in dem Durchgangsraum unterschritten wird.The invention achieves this with a device according to claim 1. This device for controlling an injector has, among other things, a passage space which can be closed on one of its two sides by an anchor element (=closure element) in order to selectively separate a high-pressure area from a low-pressure area of the injector to separate, a control chamber for exerting a variable pressure, an injector component, preferably an injector needle (= nozzle needle), a valve, which is arranged between another of the two sides of the passage chamber and the control chamber, a first connection that connects the high-pressure area of the injector with connecting the passage space and a second connection different from the first connection, which connects the passage room connects to the control room. Furthermore, it is provided, among other things, that the valve is designed to create a direct connection between the high-pressure side and the control chamber when the pressure level in the passage chamber is equal to or greater than a predetermined value or when a specific ratio of the pressure in the control chamber to the Pressure in the passage space is fallen below.

Das hierin beschriebene Ventil kann dabei das im einleitenden Teil der Beschreibung näher betrachtete Servoventil sein.The valve described herein can be the servo valve considered in more detail in the introductory part of the description.

Nach dem Stand der Technik erfolgt nach dem Öffnen des Verschlussglieds bzw. des Ankerelements, das den Durchgangsraum verschließen kann, ein Druckabfall in den Durchgangsraum, da das unter einem hohen Druck stehende Fluid (=Kraftstoff) über die Ablaufdrossel den Durchgangsraum in Richtung eines Niederdruckbereichs verlässt. Somit kommt es aufgrund der zweiten Verbindung, die den Durchgangsraum mit dem Steuerraum verbindet, auch zu einem Abströmen von unter hohem Druck stehenden Fluid aus dem Steuerraum in Richtung Durchgangsraum, sodass sich die auf die Injektorkomponente wirkende Kraft aufgrund des Drucknachlasses verringert. Wird das Verschlussglied dann wieder dichtend mit der Ablaufdrossel des Durchgangsraums in Verbindung gebracht, erfolgt ein Unterbinden des Ausströmens von Kraftstoff. Mit Hilfe der ersten Verbindung strömt dann der Kraftstoff von dem Hochdruckbereich mit hohem Druck in den Durchgangsraum ein, sodass es hierin zu einem Druckanstieg kommt. Der Steuerraum wird dabei mit Hilfe der zweiten Verbindung ebenfalls mit dem unter hohem Druck stehenden Kraftstoff geflutet, sodass die auf die Injektorkomponente (bspw. Düsennadel) wirkende Kraft ansteigt und zu einem Schließen des Injektors führt.According to the prior art, after opening the closure member or the anchor element, which can close the passage space, there is a pressure drop in the passage space, since the fluid (=fuel) that is under high pressure leaves the passage space via the outlet throttle in the direction of a low-pressure area . Thus, due to the second connection, which connects the through space to the control space, fluid under high pressure also flows out of the control space in the direction of the through space, so that the force acting on the injector component is reduced due to the pressure drop. If the closure member is then brought back into sealing contact with the outlet throttle of the passage space, the outflow of fuel is prevented. With the aid of the first connection, the fuel then flows from the high-pressure area into the passage space at high pressure, so that the pressure therein rises. The control chamber is also flooded with the fuel under high pressure with the aid of the second connection, so that the force acting on the injector component (e.g. nozzle needle) increases and causes the injector to close.

Im Gegensatz dazu reagiert das Ventil der vorliegenden Erfindung anders. Bei Übersteigen eines gewissen Drucks in dem Durchgangsraum oder bei Überschreiten eines bestimmten Verhältnisses von einem Druck in dem Durchgangsraum zu einem Druck in dem Steuerraum, wobei der Druck in dem verschlossenen Durchgangsraum durch den Zulauf über die erste Verbindung ansteigt, ist das Ventil dazu ausgelegt, eine direkte Verbindung zwischen dem Hochdruckbereich des Kraftstoffs und dem Steuerraum zu erstellen. Dadurch gelingt es den Steuerraum schneller mit dem unter einem hohen Druck stehenden Fluid (=Kraftstoff) zu befüllen, sodass ein Ausgeben von Kraftstoff durch den Injektor besonders abrupt und schnell durch die Bewegung der Injektorkomponente unterbunden wird. So kann die Einspritzmenge des Kraftstoffs besser bestimmt werden, da die Übergangsphase des Injektors von einem offenen zu einem geschlossenen Zustand, in dem kein Kraftstoff durch den Injektor ausgegeben wird, schneller verläuft.In contrast, the valve of the present invention responds differently. When a certain pressure is exceeded in the passage space or when a certain ratio of a pressure in the passage space to a pressure in the control space is exceeded, the pressure in the closed passage space increases through the inlet via the first connection, the valve is designed to create a direct connection between the high-pressure area of the fuel and the control space. This makes it possible to fill the control chamber more quickly with the fluid (=fuel) that is under high pressure, so that the injector component is prevented from dispensing fuel particularly abruptly and quickly as a result of the movement of the injector component. In this way, the injection quantity of the fuel can be better determined since the transition phase of the injector from an open to a closed state in which no fuel is discharged through the injector is faster.

Vorzugsweise verläuft die direkte Verbindung zwischen dem Hochdruckbereich und dem Steuerraum dabei nicht über den Durchgangsraum. Vielmehr ist die direkte Verbindung also eine Ankopplung des unter einem hohen Druck stehenden Kraftstoffs an den Steuerraum.The direct connection between the high-pressure area and the control chamber preferably does not run via the through-chamber. Rather, the direct connection is a coupling of the fuel, which is under high pressure, to the control chamber.

Nach einer optionalen Modifikation der Erfindung ist die erste Verbindung mit Hilfe einer Zulaufdrossel vorgesehen, die eine gedrosselte Verbindung von dem Durchgangsraum zu dem Hochdruckbereich des Injektors darstellt, wobei vorzugsweise diese Verbindung unabhängig von einem Zustand des Ventils vorhanden ist.According to an optional modification of the invention, the first connection is provided with the aid of an inlet throttle, which represents a throttled connection from the passage space to the high-pressure area of the injector, this connection preferably being present independently of a state of the valve.

Ist der Durchgangsraum unverschlossen, ist das Ankerelement also nicht auf eine Öffnung des Durchgangsraums gesetzt, entweicht unter hohem Druck stehendes Fluid (wie der Kraftstoff) in Richtung des durch das Ankerelement freigegeben Niederdruckbereich, sodass auch ein kontinuierlicher Zustrom durch die Zulaufdrossel einer Druckabnahme in dem Durchgangsraum bzw. in dem Steuerraum in einem solchen Zustand nicht entgegenwirken kann.If the passage space is not closed, i.e. the anchor element is not placed on an opening of the passage space, fluid under high pressure (such as fuel) escapes in the direction of the low-pressure area released by the anchor element, so that a continuous inflow through the inlet throttle also results in a pressure decrease in the passage space or in the control room cannot counteract in such a state.

Nach einer Fortbildung der vorliegenden Erfindung ist das Ventil ferner dazu ausgelegt, die direkte Verbindung zwischen dem Hochdruckbereich und dem Steuerraum nur dann zu erstellen, wenn das Druckniveau in dem Durchgangsraum gleich oder größer einem vorbestimmten Wert ist wohingegen ansonsten diese Verbindung geschlossen ist.According to a development of the present invention, the valve is also designed to create the direct connection between the high-pressure area and the control space only when the pressure level in the passage space is equal to or greater than a predetermined value, whereas otherwise this connection is closed.

Die direkte Verbindung zwischen dem Hochdruckbereich des Injektors und dem Steuerraum wird also nur dann durch das Ventil realisiert, wenn ein bestimmtes Druckniveau in dem Durchgangsraum erreicht ist. Hat sich aufgrund der Verbindung des Steuerraums mit dem Hochdruckbereich das Druckniveau in dem Steuerraum dem des Durchgangsraums angeglichen, ist das Ventil optionaler Weise dazu ausgelegt, die direkte Verbindung wieder zu schließen.The direct connection between the high-pressure area of the injector and the control chamber is therefore only established by the valve when a specific pressure level has been reached in the through-chamber. If, due to the connection of the control chamber to the high-pressure area, the pressure level in the control chamber has equalized that of the passage chamber, the valve is optionally designed to close the direct connection again.

So kann ebenfalls vorgesehen sein, dass das Ventil dazu ausgelegt ist, eine direkte Verbindung zwischen der Hochdruckseite und dem Steuerraum zu erstellen, wenn das Druckniveau in dem Durchgangsraum gleich oder größer einem vorbestimmten Wert ist, wobei dieser vorbestimmte Wert auf einer Differenz der Drücke zwischen dem Durchgangsraum und dem Steuerraum basiert. So kann bspw. vorgesehen sein, dass das Ventil die direkte Verbindung erstellt, wenn der Druck in dem Durchgangsraum größer als ein in dem Steuerraum vorherrschender Druck ist.It can also be provided that the valve is designed to create a direct connection between the high-pressure side and the control chamber when the pressure level in the passage chamber is equal to or greater than a predetermined value, this predetermined value being based on a difference in pressure between the passage room and the control room. For example, it can be provided that the valve establishes the direct connection when the pressure in the passage space is greater than a pressure prevailing in the control space.

Nach einer weiteren optionalen Erfindung ist die zweite Verbindung eine gedrosselte Verbindung und/oder ist die direkte Verbindung eine ungedrosselte Verbindung. Unter einer gedrosselten Verbindung versteht man, dass ein durch eine solche Leitung strömendes Fluid in seiner Strömung gehemmt wird, so dass ein Druckausgleich über eine solche gedrosselte Verbindung eine gewisse Zeit in Anspruch nimmt. Hingegen wird bei einer ungedrosselten Verbindung davon ausgegangen, dass keine Strömungshindernisse für das Fluid vorhanden sind, um einen Druckausgleich des Fluides über eine solche Verbindung nicht zu verhindern.According to a further optional invention, the second connection is a throttled connection and/or the direct connection is an unthrottled connection. A throttled connection is understood to mean that a fluid flowing through such a line is restricted in its flow, so that a pressure equalization via such a throttled connection takes a certain amount of time. In contrast, in the case of an unthrottled connection, it is assumed that there are no flow obstacles for the fluid in order not to prevent pressure equalization of the fluid via such a connection.

Nach der Erfindung ist vorgesehen, dass das Ventil eine Ventilführung, die zwischen der anderen der beiden Seiten des Durchgangsraums und dem Steuerraum angeordnet ist, und einen Ventileinsatz umfasst, der in der Ventilführung verschiebbar gelagert ist. Dabei weist die Ventilführung einen Kanal auf, der bei einer ersten Lage des verschiebbaren Ventileinsatzes in der Ventilführung keine direkte Fluidverbindung zwischen dem Hochdruckbereich und dem Steuerraum herstellt und bei einer zweiten Lage des verschiebbaren Ventileinsatzes in der Ventilführung eine direkte Fluidverbindung zwischen dem Hochdruckbereich und dem Steuerraum herstellt. Demnach gibt es in der ersten Lage des Ventileinsatzes keine direkte Verbindung zwischen dem Hochdruckbereich und dem Steuerraum. Somit wird eine besonders einfache Umsetzung des Ventils erreicht.According to the invention, it is provided that the valve comprises a valve guide, which is arranged between the other of the two sides of the passage space and the control space, and a valve insert, which is slidably mounted in the valve guide. In this case, the valve guide has a channel which, in a first position of the sliding valve insert in the Valve guide does not produce a direct fluid connection between the high-pressure region and the control chamber and produces a direct fluid connection between the high-pressure region and the control chamber in a second position of the displaceable valve insert in the valve guide. Accordingly, there is no direct connection between the high-pressure area and the control chamber in the first position of the valve insert. A particularly simple implementation of the valve is thus achieved.

Nach einer Fortbildung der Erfindung bewegt sich der Ventileinsatz bei Überschreiten eines vorbestimmten Druckniveaus in dem Durchgangsraum zumindest vorrübergehend in die zweite Lage, wodurch die beiden Steuerräume getrennt werden.According to a further development of the invention, when a predetermined pressure level in the passage space is exceeded, the valve insert moves at least temporarily into the second position, as a result of which the two control spaces are separated.

Nach der Erfindung ist vorgesehen, dass sich der Ventileinsatz bei Unterschreiten eines vorbestimmten Druckniveaus in dem Durchgangsraum in die erste Lage bewegt.According to the invention, it is provided that the valve insert moves into the first position when the pressure level in the passage space falls below a predetermined level.

Nach der Erfindung ist vorgesehen, dass sich der Ventileinsatz in die erste Lage bewegt, wenn eine Druckdifferenz zwischen dem Durchgangsraum und dem Steuerraum einen vorgegebenen Wert unterschreitet. So kann bspw. bei einem höheren Druck in dem Steuerraum gegenüber einem Druckniveau in dem Durchgangsraum der Ventileinsatz in die erste Lage bewegt werden. Vorteilhafterweise geschieht das Bewegen des Ventileinsatzes automatisch durch die unterschiedlich anliegenden Drücke in dem Steuerraum und dem Durchgangsraum, da diese auf der jeweiligen Seite des Ventileinsatzes (Seite im Durchgangsraum oder Seite im Steuerraum) eine gewisse Kraft auf den Ventileinsatz ausüben und diesen entsprechenden den vorherrschenden Druckniveaus im Zusammenhang mit der wirksamen Druckfläche des Ventileinsatzes eine Verschiebung in eine Richtung vorgenommen werden kann.According to the invention, it is provided that the valve insert moves into the first position when a pressure difference between the passage space and the control space falls below a predetermined value. For example, when the pressure in the control chamber is higher than the pressure level in the passage chamber, the valve insert can be moved into the first position. Advantageously, the movement of the valve insert occurs automatically due to the different pressures in the control chamber and the passage chamber, since these exert a certain force on the valve insert on the respective side of the valve insert (side in the passage chamber or side in the control chamber) and this corresponds to the prevailing pressure levels in the A shift in one direction can be made in connection with the effective pressure area of the valve insert.

Ebenfalls kann nach der Erfindung vorgesehen sein, dass diese ferner ein Anschlagelement aufweist, das den Hub des Ventileinsatzes bei einer Bewegung von der ersten Lage in die zweite Lage begrenzt. Dadurch ist es möglich, die Herstelltoleranzen an den Bauteilen großzügiger zu gestalten und insgesamt die Kosten der beanspruchten Vorrichtung zu senken. Zudem bewirkt das den Hub des Ventileinsatzes beschränkende Anschlagelement den vorteilhaften Umstand, wonach der Rückstellweg des Ventileinsatzes in die erste Lage vermindert wird, so dass die Aktivierung des Ventils bei der nächsten Einspritzung schneller erreicht werden kann.It can also be provided according to the invention that it also has a stop element which increases the stroke of the valve insert during a movement limited from the first layer to the second layer. This makes it possible to make the manufacturing tolerances on the components more generous and to reduce the costs of the claimed device overall. In addition, the stop element limiting the stroke of the valve insert brings about the advantageous circumstance that the return path of the valve insert into the first position is reduced, so that activation of the valve can be achieved more quickly during the next injection.

Nach einer optionalen Fortbildung der Erfindung ist das Anschlagelement ein scheibenförmiger Körper, der eine oder mehrere Durchgangsöffnungen aufweist.According to an optional development of the invention, the stop element is a disc-shaped body that has one or more through openings.

Dabei kann ferner vorgesehen sein, dass das Anschlagelement an der Ventilführung befestigt, vorzugsweise verschweißt ist.It can also be provided that the stop element is attached to the valve guide, preferably welded.

Zudem ist möglich, dass das Anschlagelement in dem Steuerraum angeordnet ist oder an der zum Steuerraum weisenden Seite der Ventilführung angeordnet ist.In addition, it is possible for the stop element to be arranged in the control chamber or on the side of the valve guide pointing towards the control chamber.

Das optionale Vorsehen von mindestens einer Durchgangsöffnung in dem Anschlagelement dient zum Durchströmen des Kraftstoffs hin zum Steuerraum bzw. zu der zweiten Verbindung.The optional provision of at least one through-opening in the stop element serves for the fuel to flow through to the control chamber or to the second connection.

Nach einer weiteren vorteilhaften Modifikation der vorliegenden Erfindung weist die Vorrichtung ferner ein Rückstellelement auf, das den Ventileinsatz mit einer Kraft beaufschlagt, die diesen von der zweiten Lage in die erste Lage drängt. Durch ein solches Rückstellelement wird der Ventileinsatz nach der Einspritzung automatisch wieder in die Ausgangsposition der ersten Lage zurückgestellt. Dadurch muss der Ventileinsatz bei der Aktivierung der nächsten Einspritzung nicht erst dem Ventilhub, also die Differenz zwischen der ersten und der zweiten Lage überwinden, sodass sich die Reaktionszeit verkürzt.According to a further advantageous modification of the present invention, the device also has a restoring element which applies a force to the valve insert which forces it from the second position into the first position. By means of such a restoring element, the valve insert is automatically returned to the starting position of the first layer after the injection. As a result, when the next injection is activated, the valve insert does not first have to overcome the valve lift, i.e. the difference between the first and second position, which shortens the reaction time.

Dabei kann vorgesehen sein, dass das Rückstellelement ein elastisches Element ist, vorzugsweise eine Feder oder eine Spiralfeder, die den Ventileinsatz mit einer bestimmten Kraft in die erste Lage drängt. Vorzugsweise ist das elastische Element dabei an einer zum Steuerraum gewandten Seite des Ventileinsatzes angeordnet.It can be provided that the restoring element is an elastic element, preferably a spring or a spiral spring, which the valve insert with a certain force in the first position. The elastic element is preferably arranged on a side of the valve insert that faces the control chamber.

Vorzugsweise stellt das Ventil ein 3/2-Wegeventil dar, da es gegenüber dem im Stand der Technik verwendeten 2/2-Wegeventilen einen zusätzlichen Kraftstoffkanal im Hochdruckbereich des Injektors aufweist, der in einem bestimmten Zustand des Ventils mit dem Steuerraum eine direkte Fluidverbindung aufweist.The valve is preferably a 3/2-way valve because, compared to the 2/2-way valves used in the prior art, it has an additional fuel channel in the high-pressure area of the injector, which has a direct fluid connection to the control chamber in a specific state of the valve.

Weitere Einzelheiten, Merkmale und Vorteile der Erfindung werden anhand der nachfolgenden Figurenbeschreibung ersichtlich.Further details, features and advantages of the invention can be seen from the following description of the figures.

Dabei zeigen:

Fig. 1:
einen Teil einer schematischen Schnittdarstellung eines Injektors mit der erfindungsgemäßen Vorrichtung,
Fig. 2:
eine vergrößerte Darstellung des Ventils des Injektors,
Figs. 3a - d:
mehrere Zustände der erfindungsgemäßen Vorrichtung während einem Arbeitszyklus des Injektors,
Fig. 4:
eine erste Ausführungsform des Ventils,
Fig. 5:
eine zweite Ausführungsform des Ventils,
Fig. 6:
mehrere Draufsichten auf eine Vielzahl von möglichen Umsetzungen des Ventils in einer schematischen Darstellung und
Fig. 7:
mehrere Varianten eines Anschlagelements zum Beschränken des Hubs eines Ventileinsatzes.
show:
Figure 1:
a part of a schematic sectional view of an injector with the device according to the invention,
Figure 2:
an enlarged view of the valve of the injector,
figs 3a - d:
several states of the device according to the invention during a working cycle of the injector,
Figure 4:
a first embodiment of the valve,
Figure 5:
a second embodiment of the valve,
Figure 6:
several top views of a large number of possible implementations of the valve in a schematic representation and
Figure 7:
several variants of a stop element for limiting the stroke of a valve insert.

Fig. 1 zeigt eine Teilschnittansicht einer schematischen Darstellung eines Injektors 2. Man erkennt die bewegbare Injektornadel 6, die in Richtung des darüber angeordneten Ventils 7 bewegt werden kann. Ist die Injektornadel 6 hin zum Ventil 7 bewegt, kommt es an dem nicht dargestellten Ende des Injektors zu einem Ausströmen von Kraftstoff. Im anderen Fall, bei der die Injektornadel 6 an ihrem von dem Ventil 7 entfernten Platz angeordnet ist, strömt aus dem Injektor 2 kein Kraftstoff aus. 1 shows a partial sectional view of a schematic representation of an injector 2. One recognizes the movable injector needle 6, which can be moved in the direction of the valve 7 arranged above it. If the injector needle 6 is moved toward the valve 7, fuel flows out at the end of the injector (not shown). In the other case, in which the injector needle 6 is arranged in its place away from the valve 7, no fuel flows out of the injector 2.

In direkter Nachbarschaft zu der Injektornadel 6 befindet sich zwischen dem Ventil 7 ein Steuerraum 5, in dem ein variabler Druck erzeugbar ist. Das Ventil 7 mit seiner Durchgangsöffnung 3 schließt sich direkt an das Verschlussglied bzw. des Ankerelement 4 an, das die Durchgangsöffnung 3 fluiddicht verschließen kann. Hierzu ist ein gewisser Druck erforderlich, der das Ankerelement 4 in Richtung der Durchgangsöffnung 3 drängt. Dies wird mit Hilfe der mit dem Ankerelement 4 zusammenwirkenden Feder erreicht. Möchte man nun das Ankerelement 4 von der Durchgangsöffnung 3 abheben, sodass es zu einer Druckveränderung in der Durchgangsöffnung 3 bzw. dem Steuerraum 5 kommt, so wird mit Hilfe eines Elektromagneten eine das Ankerelement 4 von der Durchgangsöffnung 3 wegziehende Kraft erzeugt. Dabei sind ein Magnetinnenpol 23 und ein Magnetaußenpol 22 in dem Injektorgehäuse 21 vorgesehen, die zusammen mit einer Spule einen Elektromagneten zum Ansteuern des Verschlussglieds bilden.Located in the direct vicinity of the injector needle 6 between the valve 7 is a control chamber 5 in which a variable pressure can be generated. The valve 7 with its through-opening 3 is directly connected to the closure member or anchor element 4, which can close the through-opening 3 in a fluid-tight manner. A certain pressure is required for this, which forces the anchor element 4 in the direction of the through-opening 3 . This is achieved with the help of the spring interacting with the anchor element 4 . If one now wants to lift the armature element 4 from the through-opening 3 so that there is a pressure change in the through-opening 3 or the control chamber 5, a force pulling the armature element 4 away from the through-opening 3 is generated with the aid of an electromagnet. An inner magnet pole 23 and an outer magnet pole 22 are provided in the injector housing 21, which together with a coil form an electromagnet for controlling the closure element.

Figur 2 zeigt eine vergrößerte Darstellung der erfindungsgemäßen Vorrichtung 1, insbesondere von dem Ventil 7. Man erkennt nun nur noch den unteren Bereich des Ankerelements 4, der in einem in Richtung des Ventils wirkenden Zustand einen Durchgangsraum 3 dicht abschließt, wohingegen in einem angezogenen Zustand des Ankerelements 4 der Durchgangsraum 3 eine Fluidverbindung mit dem das Ankerelement 4 umgebenden Bereich aufweist. Für eine dichte Verbindung sorgt der Dichtsitz 41. Eine Durchgangsöffnung 32 wird demnach mit Hilfe des Ankerelements 4 verschlossen. Der Durchgangsraum 3 weist darüber hinaus eine Zulaufdrossel 8 auf, die einen unter hohem Druck stehenden Kraftstoff in den Durchgangsraum 3 einströmen lässt. Ferner gibt es eine zweite Drossel 9, die als Ablaufdrossel 9 bezeichnet wird, welche eine Fluidverbindung zu dem Steuerraum 5 zulässt. Dabei ist der Ventileinsatz 72 bewegbar gegenüber der Ventilführung 71 angeordnet. Bei einem Anliegen von bestimmten Drücken in dem Steuerraum 5 bzw. dem Durchgangsraum 3 kann demnach der Ventileinsatz 72 in Richtung Durchgangsöffnung 3 hin- bzw. wegbewegt werden. figure 2 shows an enlarged view of the device 1 according to the invention, in particular of the valve 7. Only the lower area of the anchor element 4 can now be seen, which tightly closes off a passage space 3 in a state acting in the direction of the valve, whereas in a tightened state of the anchor element 4 the passage space 3 has a fluid connection with the area surrounding the anchor element 4 . The sealing seat 41 ensures a tight connection. A passage opening 32 is accordingly closed with the aid of the anchor element 4 . The passage space 3 also has an inlet throttle 8 which allows fuel under high pressure to flow into the passage space 3 . There is also a second throttle 9, which is referred to as an outlet throttle 9, which allows a fluid connection to the control chamber 5. The valve insert 72 is arranged such that it can move relative to the valve guide 71 . When certain pressures are present in the control chamber 5 or the passage chamber 3, the valve insert 72 can accordingly be moved toward or away in the direction of the passage opening 3.

Anhand der nachfolgend beschriebenen Figs. 3a - 3d wird die vorliegende erfindungsgemäße Vorrichtung bzw. die Funktionsweise des erfindungsgemäßen Ventils beschrieben.Using the methods described below figs 3a - 3d the present device according to the invention or the functioning of the valve according to the invention is described.

Fig. 3a zeigt den Zustand, in dem das Pilotventil, also die Öffnung des Ankerelements 4 bezüglich der Durchgangsöffnung 3, in einem geschlossenen Zustand und demnach der Injektor 2 keine Einspritzung von Kraftstoff vornimmt. Im unbestromten Zustand des Elektromagneten 22, 23 wird die Durchgangsöffnung 3, die auch eine Bohrung sein kann, durch das Verschlussglied 4 (=Ankerelement) mit Hilfe der Vorspannung der Druckfeder 24 (vgl. Fig. 1) verschlossen. Die Durchgangsöffnung ist dabei in einer sogenannten Sitzplatte 31 vorgesehen. In einem solchen Zustand trennt das Ankerelement 4 den Hochdruckbereich HP vom Niederdruckbereich eines Kraftstoffs ab. Durch das Ansteuern des Elektromagneten 22, 23 wird das Ankerelement 4 angezogen und die Durchgangsöffnung 3 in der Sitzplatte 31 freigegeben. Der Druck unterhalb der Sitzplatte 31 bzw. innerhalb der Durchgangsöffnung 3 wird somit abgesenkt und der in der Ventilführung 71 bewegbar aufgenommene Ventileinsatz 72 gegen die Unterkante der Ventilführung 71 angezogen. Darüber hinaus wird ein Kraftstoff mit einem hohen Druck vom Hochdruckbereich über eine Zulaufdrossel 8 dem Durchgangsbereich zugeführt. Über den Durchgangsbereich 3 verläuft der unter einem hohen Druck stehende Kraftstoff über eine weitere Verbindung 9 zu dem Steuerraum 5. Daher herrscht im Steuerraum ein sehr hoher Druck, der auf die Injektornadel 6 wirkt und dafür sorgt, dass die Injektornadel eine nicht dargestellte Austrittsöffnung verschließt. Der sich hier einstellende Niederdruckbereich LP des Kraftstoffs wird demnach von dem Hochdruckbereich HP, der sich nun auch in dem Durchgangsraum 3 und dem Steuerraum 5 befindet, mit Hilfe des Ankerelements 4 getrennt. Figure 3a shows the state in which the pilot valve, ie the opening of the armature element 4 with respect to the through opening 3, is in a closed state and accordingly the injector 2 does not inject fuel. In the de-energized state of the electromagnets 22, 23, the through-opening 3, which can also be a bore, is closed by the closing element 4 (=anchor element) with the aid of the prestressing of the compression spring 24 (cf. 1 ) locked. The through opening is provided in what is known as a seat plate 31 . In such a state, the anchor element 4 separates the high-pressure area HP from the low-pressure area of a fuel. By controlling the electromagnet 22, 23, the anchor element 4 is attracted and the through-opening 3 in the seat plate 31 is released. The pressure below the seat plate 31 or within the passage opening 3 is thus lowered and the valve insert 72 accommodated movably in the valve guide 71 is pulled against the lower edge of the valve guide 71 . In addition, fuel is supplied at high pressure from the high-pressure area via an inlet throttle 8 to the transit area. The fuel, which is under high pressure, runs via the passage area 3 via a further connection 9 to the control chamber 5. There is therefore a very high pressure in the control chamber, which acts on the injector needle 6 and ensures that the injector needle closes an outlet opening (not shown). The low-pressure area LP of the fuel that is set here is therefore separated from the high-pressure area HP, which is now also in the Passage space 3 and the control room 5 is separated by means of the anchor element 4 .

Fig. 3b zeigt einen Zustand, in dem das Pilotventil offen ist und eine Einspritzung durch den Injektor 2 vorgenommen wird. Figure 3b FIG. 12 shows a state in which the pilot valve is open and injection is made by the injector 2. FIG.

Ein Öffnen des Pilotventils bedeutet ein Anheben des Ankerelements 4, sodass aus dem Durchgangsraum 3 Kraftstoff von dem hohen Druckbereich HP hin zum Niederdruckbereich LP strömen kann. Demnach ermöglicht das Anheben des Ankerelements 4 eine direkte Fluidverbindung zwischen dem Durchgangsraum 3 und dem das Ankerelement 4 umgebenden Bereich. Es kommt demnach zu einem Ausströmen von Kraftstoff aus dem Durchgangsraum 3 in Richtung Ankerelement 4. Dies führt auch dazu, dass der in dem Steuerraum 5 unter einem hohen Druck befindliche Kraftstoff durch die Ablassdrossel 9 hin zu dem Niederdruckbereich des Injektors aufgrund der vorhandenen Druckdifferenz strömt. Dies führt zu einer Druckreduktion oberhalb der Injektornadel 6, wodurch die so entstandene Verminderung des Drucks auf den Injektornadelkörper 6 zu einem Anheben der Injektornadel 6 aus ihrem Düsensitz führt und eine Einspritzung erfolgt.Opening the pilot valve means that the armature element 4 is raised, so that fuel can flow from the high-pressure area HP to the low-pressure area LP out of the passage space 3 . Accordingly, lifting the anchor element 4 enables a direct fluid connection between the passage space 3 and the area surrounding the anchor element 4 . Accordingly, fuel flows out of the passage space 3 in the direction of the anchor element 4. This also means that the fuel in the control space 5 under high pressure flows through the discharge throttle 9 towards the low-pressure area of the injector due to the existing pressure difference. This leads to a pressure reduction above the injector needle 6, as a result of which the resulting reduction in the pressure on the injector needle body 6 leads to the injector needle 6 being lifted out of its nozzle seat and an injection taking place.

Dabei sind die Zulaufdrossel 8 und die Ablaufdrossel 9 sowie der Durchgangsraum 3 so dimensioniert, dass die beschriebenen Vorgänge stattfinden.The inlet throttle 8 and the outlet throttle 9 and the passage space 3 are dimensioned so that the processes described take place.

Fig. 3c zeigt den Zustand, bei dem das Pilotventil gerade schließt und eine Einspritzung des Injektors 2 noch vorhanden ist. 3c shows the state in which the pilot valve is just closing and injection from the injector 2 is still present.

Sobald die Bestromung des Elektromagneten 22, 23 unterbrochen wird, drückt die Rückstellfeder 24 das Ankerelement 4 zurück in einen dichtenden Sitz auf der Sitzplatte 31 (vgl. Figur 1). Nun kann kein Kraftstoff mehr aus dem Durchgangsraum 3 über die durch das Ankerelement 4 abgedichtete Öffnung des Durchgangsraums 3 entweichen. Somit erhöht sich nun aufgrund der Zulaufdrossel 8, die eine bestimmte Menge von unter hohem Druck stehenden Kraftstoff in den Durchgangsraum 3 einlässt, der Druck oberhalb des Ventileinsatzes 72.As soon as the energization of the electromagnet 22, 23 is interrupted, the restoring spring 24 presses the armature element 4 back into a sealing seat on the seat plate 31 (cf. figure 1 ). Now no more fuel can escape from the passage space 3 via the opening of the passage space 3 sealed by the anchor element 4 . Thus, now increases due to the inlet throttle 8, which is a certain amount of high pressure fuel into the passage space 3, the pressure above the valve insert 72.

Fig. 3d zeigt einen Zustand in dem das Pilotventil geschlossen ist, die Injektornadel 6 schließt und die Einspritzung des Injektors 2 beendet wird. 3d shows a state in which the pilot valve is closed, the injector needle 6 closes and the injection of the injector 2 is terminated.

Hierzu zeigt Fig.3d ebenfalls eine Schnittansicht des in den Figs. 3a-3c diskutierten Bereichs, jedoch wird in Fig. 3d eine andere Schnittebene dargestellt, um die erfindungsgemäßen Merkmale besser darstellen zu können. In der in Figur 3d dargestellten Situation wurde gerade eben erst das Ankerelement 4 in eine dichtende Stellung gegenüber der Öffnung des Durchgangsraums 3 gebracht, so dass nun ein unter hohem Druck stehender Kraftstoff über die Zulaufdrossel 8 in den Durchgangsraum 3 einströmt. Somit erhöht sich also das Druckniveau in dem Durchgangsraum 3, so dass aufgrund des sehr hohen Drucks in dem Durchgangsraum 3 gegenüber dem Steuerraum 5 eine Bewegung des Ventileinsatzes 72 weg von dem Durchgangsraum 3 erzeugt wird. Aufgrund dieser Bewegung entsteht eine direkte, drosselfreie Verbindung von dem Hochdruckbereich HP des Kraftstoffs zu dem Steuerraum 5. Vorliegend passiert dies damit, dass bei der nach unten geführten Bewegung des Ventileinsatzes 72 die Zuführkanäle 10 in der Ventilführung 71 eine Fluidverbindung mit dem Steuerraum erstellen. Diese Fluidverbindung entsteht nur aufgrund der Bewegung des Ventileinsatzes 72, die aufgrund des erhöhten Drucks in dem Durchgangsraum 3 bewirkt worden ist. So entsteht aufgrund dieser Bohrungen 10 eine direkte Verbindung zwischen dem Hochdruckvolumen im Injektor 2 und dem Steuerraum 5 oberhalb der Injektornadel 6.For this shows Fig.3d also a sectional view of the figs 3a-3c discussed area, however, in 3d shown a different section plane to better represent the features of the invention. in the in Figure 3d In the situation shown, the anchor element 4 has only just been brought into a sealing position relative to the opening of the passage space 3 , so that fuel which is under high pressure now flows into the passage space 3 via the inlet throttle 8 . The pressure level in the passage space 3 thus increases, so that due to the very high pressure in the passage space 3 compared to the control chamber 5, a movement of the valve insert 72 away from the passage space 3 is generated. This movement creates a direct, throttle-free connection from the high-pressure area HP of the fuel to the control chamber 5. In the present case, this happens because when the valve insert 72 moves downwards, the supply channels 10 in the valve guide 71 create a fluid connection with the control chamber. This fluid connection only occurs due to the movement of the valve insert 72, which has been brought about due to the increased pressure in the passage space 3. Because of these bores 10, a direct connection is created between the high-pressure volume in the injector 2 and the control chamber 5 above the injector needle 6.

Dadurch steigt der Druck in dem Steuerraum 5 oberhalb der Injektornadel 6 sehr schnell an, was zu einem besonders schnellen Schließen der Düse durch die Nadel 6 führt. Es ist nun nicht mehr länger erforderlich, auf ein Einströmen des unter hohen Drucks stehenden Kraftstoffs von dem Durchgangsraum 3 über die Drossel 9 in den Steuerraum 5 zu warten. Insbesondere ist dies von Vorteil, da die Drossel 9 in ihrer Geometrie für einen Öffnungsvorgang optimiert ist, so dass mit der vorliegenden Erfindung sowohl ein Öffnungsvorgang als auch ein Schließvorgang unabhängig voneinander optimiert werden kann.As a result, the pressure in the control chamber 5 above the injector needle 6 rises very quickly, which leads to the nozzle being closed particularly quickly by the needle 6 . It is now no longer necessary to wait for the fuel, which is under high pressure, to flow from the passage space 3 via the throttle 9 into the control space 5 . In particular, this is advantageous because the geometry of the throttle 9 is optimized for an opening process, so that with of the present invention, both an opening process and a closing process can be optimized independently of one another.

Figur 4 zeigt eine Schnittansicht einer weiteren Ausführungsform der vorliegenden Erfindung. figure 4 Fig. 12 shows a sectional view of another embodiment of the present invention.

In ihrem Aufbau bzw. ihrer Funktion identische Bauteile werden mit den zugehörigen Bezugszeichen der vorstehend beschriebenen Figuren bezeichnet. Man erkennt eine Spiralfeder 13, die dazu dient, den Ventileinsatz 72 nach einer Einspritzung wieder in die Ausgangsposition zurückzustellen. Ist also der Druck in dem Steuerraum gleich dem in dem Hochdruckbereich vorherrschenden Druck, verbleibt etwa der Ventileinsatz 72 nicht in der Lage, in der eine Fluidverbindung durch den in der Ventilführung vorgesehenen Kanal 10 besteht, sondern wird mit Hilfe der Feder 13 in seine Ausgangslage zurückgeführt. Dies bringt den Vorteil mit sich, dass der Ventileinsatz 72 bei der Aktivierung der nächsten Einspritzung nicht erst den Ventilhub überwinden muss und sich die Reaktionszeit des Injektors dadurch verkürzt.Components that are identical in terms of structure or function are denoted by the associated reference symbols of the figures described above. A spiral spring 13 can be seen, which is used to return the valve insert 72 to its starting position after an injection. If the pressure in the control chamber is equal to the pressure prevailing in the high-pressure area, the valve insert 72 does not remain in the position in which there is a fluid connection through the channel 10 provided in the valve guide, but is returned to its initial position with the aid of the spring 13 . This brings with it the advantage that the valve insert 72 does not first have to overcome the valve lift when the next injection is activated, and the reaction time of the injector is shortened as a result.

Fig. 5 zeigt eine weitere Ausführungsform der vorliegenden Erfindung, bei der ein Anschlagelement 11 in Form eines scheibenförmigen Körpers vorgesehen ist, um den Hub des Ventileinsatzes 72 zu begrenzen. Vorzugsweise ist das Anschlagelement 11 mit Hilfe von Laserschweißen an der Ventilführung 71 befestigt. Durch das Vorsehen des Anschlagelements 11 können die Herstelltoleranzen an den Bauteilen großzügiger gestaltet werden. Weiter weist das Anschlagelement 11 Durchgangsöffnungen 12 auf, die dazu dienen, Kraftstoff durch das Anschlagelement 11 strömen zu lassen. figure 5 Fig. 13 shows another embodiment of the present invention, in which a stop member 11 in the form of a disc-shaped body is provided to limit the stroke of the valve core 72. Figs. Preferably, the stop member 11 is attached to the valve guide 71 by laser welding. By providing the stop element 11, the manufacturing tolerances on the components can be made more generous. Furthermore, the stop element 11 has through openings 12 which are used to allow fuel to flow through the stop element 11 .

Fig. 6 zeigt vier verschiedene Ausführungsformen für die Außenform der Ventilführung 71. Fügt man diese nun in eine Bohrung ein, die sich bündig mit den kreisförmigen Außenabschnitten der Ventilführung 71 anschließt, können die abgeflachten Abschnitte dazu dienen, Kraftstoff seitlich an der Hülse vorbeizuführen. 6 shows four different embodiments for the outer shape of the valve guide 71. If this is now inserted into a bore which is flush with the circular outer sections of the valve guide 71, the flattened sections can serve to guide fuel past the side of the sleeve.

Fig.7 zeigt eine Draufsicht auf zwei verwendbare Anschlagelemente 11 zum Begrenzen des Hubs des Ventileinsatzes 72. Man erkennt, dass jedes der beiden Anschlagelemente 11 mindestens eine Durchgangsöffnung 12 aufweist. Fig.7 shows a top view of two stop elements 11 that can be used to limit the stroke of the valve insert 72. It can be seen that each of the two stop elements 11 has at least one through opening 12.

Mit der vorliegenden Erfindung wird die Funktion von zwei Bauteilen (Federhülse und Ventilführung) in einem Bauteil vereint. Dabei kann vorgesehen sein, dass der Rohling des Ventils 7 vorzugsweise als MIM (Metal Injection Molding) ausgeführt wird und bereits sämtliche Bohrungen bis auf die Ablaufdrossel 9 sowie die Zulaufdrossel 8 aufweist, welche nachträglich erodiert werden.With the present invention, the function of two components (spring sleeve and valve guide) is combined in one component. It can be provided that the blank of the valve 7 is preferably designed as MIM (Metal Injection Molding) and already has all the bores except for the outlet throttle 9 and the inlet throttle 8, which are subsequently eroded.

Bei einem Metal Injection Molding-Verfahren handelt es sich um ein Fertigungsverfahren, bei dem ein Grünling mittels Spritzgussverfahren hergestellt wird und anschließend in einem Ofen fertig gesintert wird. Dadurch lassen sich sehr komplexe Bauteilgeometrien kostengünstig realisieren und die Zerspanung am Bauteil auf ein Minimum reduzieren.A metal injection molding process is a manufacturing process in which a green body is produced by injection molding and then sintered in a furnace. As a result, very complex component geometries can be implemented cost-effectively and machining on the component can be reduced to a minimum.

Anhand von Fig. 5 erkennt man, dass nach einer Fertigung der Ablaufdrossel 9 die seitliche Bohrung, die zum Fertigen der Drossel benötigt wird, mit Hilfe eines Laserschweißverfahrens verschlossen wird. Die in der Fig. 5 bzw. der Fig. 4 dargestellt Kugel soll nur eine solche Verschweißung andeuten und wird nicht in der tatsächlichen Größe verbaut.Based on figure 5 it can be seen that after the outlet throttle 9 has been manufactured, the lateral borehole, which is required for manufacturing the throttle, is closed using a laser welding process. The one in the figure 5 or the 4 The ball shown is only intended to indicate such a weld and is not installed in the actual size.

Claims (12)

  1. A device (1) for controlling an injector (2) comprising:
    a passage space (3) that is closable by an armature element (4) at one of its two sides to thus selectively separate a fluid high pressure region (HP) from a fluid low pressure region of the injector (2);
    a control space (5) for exerting a variable pressure on an injector component, preferably an injector needle (6);
    a valve (7) that is arranged between another of the two sides of the passage space (3) and the control space (5);
    a first connection (8) that connects the high pressure region (HP) of the injector (2) to the passage space (3); and
    a second connection (9) that is different from the first connection and that connects the passage space (3) to the control space (5), wherein
    the valve (7) is adapted to establish a direct connection (10) different from the second connection between the high pressure region and the control space (5) when the pressure level in the passage space (3) is equal to or greater than a predetermined value;
    a valve guide (71) is provided that is arranged between the other one of the two sides of the passage space (3) and the control space (5); and
    a valve core (72) is provided that is displaceably supported in the valve guide (71),
    characterized in that
    the valve guide (71) has a channel (10) that forms a part of the direct connection and that does not establish fluid communication between the high pressure region (HP) and the control space (5) in a first position of the displaceable valve core (72) in the valve guide (71) and establishes fluid communication between the high pressure region (HP) and the control space (5) in a second position of the displaceable valve core (72) in the valve guide (71).
  2. A device (1) in accordance with claim 1, wherein the direct connection (10) does not take place via the passage space (3).
  3. A device (1) in accordance with one of the preceding claims, wherein the first connection (8) is a feed throttle that represents a restricted connection of the passage space (3) to the high pressure region (HP) of the injector (2), with this connection (8) preferably being independent of a state of the valve (7).
  4. A device (1) in accordance with one of the preceding claims, wherein the valve (7) is further adapted only to establish the direct connection (10) between the high pressure region (HP) and the control space (5) when the pressure level in the passage space (3) is equal to or greater than a predetermined value, and is adapted to otherwise preferably close this connection (7).
  5. A device (1) in accordance with one of the preceding claims, wherein the second connection (9) is a restricted connection.
  6. A device (1) in accordance with one of the preceding claims, wherein the direct connection (10) is an unrestricted connection.
  7. A device (1) in accordance with one of the preceding claims, wherein an abutment element (11) that limits the stroke of the valve core (72) on a movement from the first position into the second position is furthermore provided.
  8. A device (1) in accordance with claim 7, wherein the abutment element (11) is a disk-shaped member that has one or more passage openings (12).
  9. A device (1) in accordance with one of the claims 7 or 8, wherein the abutment element (11) is fastened, preferably welded, to the valve guide (71).
  10. A device (1) in accordance with one of the claims 7 to 9, wherein the abutment element (11) is arranged in the control space (5).
  11. A device (1) in accordance with one of the preceding claims, furthermore having a return element (13) that applies a force on the valve core (72) that urges the valve core (72) from the second position into the first position.
  12. A device (1) in accordance with claim 11, wherein the return element (13) is a resilient element, preferably a spring or a coil spring, that urges the valve core (72) into the first position with a specific force.
EP18745562.1A 2017-07-20 2018-07-20 Device for controlling an injector Active EP3655643B1 (en)

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DE102017116367.0A DE102017116367A1 (en) 2017-07-20 2017-07-20 Device for controlling an injector
PCT/EP2018/069838 WO2019016399A1 (en) 2017-07-20 2018-07-20 Device for controlling an injector

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DE (1) DE102017116367A1 (en)
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Publication number Priority date Publication date Assignee Title
DE19823937B4 (en) * 1998-05-28 2004-12-23 Siemens Ag Servo valve for fuel injection valve
DE10131619A1 (en) * 2001-06-29 2003-01-23 Bosch Gmbh Robert Fuel injector with injection course shaping
DE10212396A1 (en) * 2002-03-20 2003-10-09 Bosch Gmbh Robert Fuel injection system with 3/2-way valve
DE102004028195A1 (en) * 2004-06-09 2005-12-29 Volkswagen Mechatronic Gmbh & Co. Kg Injection valve with Schließdruckbeaufschlagung the valve needle
DE102004028885A1 (en) * 2004-06-15 2006-01-05 Robert Bosch Gmbh Fuel injection valve
RU2438035C2 (en) * 2006-03-03 2011-12-27 Ганзер-Хюдромаг Аг Injection fuel valve for internal combustion engine (versions)
US8224518B2 (en) 2008-08-18 2012-07-17 Trimble Navigation Limited Automated recordation of crane inspection activity
EP2583262A1 (en) 2008-10-27 2013-04-24 Scot I. Williams Wind turbine inspection
JP5732834B2 (en) * 2010-03-31 2015-06-10 株式会社デンソー Fuel injection device
DE102012202538A1 (en) * 2012-02-20 2013-08-22 Robert Bosch Gmbh fuel injector
DE102012209841A1 (en) * 2012-06-12 2013-12-12 Robert Bosch Gmbh Fuel injector for common-rail fuel injection system, has control piston guided in valve unit, which divides control chamber into multiple pressure chambers, where former pressure chamber is arranged between shaft end and control piston
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US20160031680A1 (en) 2014-07-31 2016-02-04 Trimble Navigation Limited Crane productivity coordination
GB201414669D0 (en) * 2014-08-19 2014-10-01 Delphi International Operations Luxembourg S.�.R.L. Control valve arrangement
DE102015113980A1 (en) * 2014-09-02 2016-03-03 Denso Corporation Fuel injection valve
GB201517148D0 (en) * 2015-09-29 2015-11-11 Delphi Int Operations Lux Srl Fuel injector

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CN111051681B (en) 2022-04-19
EP3655643A1 (en) 2020-05-27
DE102017116367A1 (en) 2019-01-24
US20200271080A1 (en) 2020-08-27
WO2019016399A1 (en) 2019-01-24
US11608805B2 (en) 2023-03-21
ES2921909T3 (en) 2022-09-02

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