EP2984328B1 - Fuel injection valve for internal combustion engines - Google Patents
Fuel injection valve for internal combustion engines Download PDFInfo
- Publication number
- EP2984328B1 EP2984328B1 EP14703854.1A EP14703854A EP2984328B1 EP 2984328 B1 EP2984328 B1 EP 2984328B1 EP 14703854 A EP14703854 A EP 14703854A EP 2984328 B1 EP2984328 B1 EP 2984328B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chamber
- control valve
- control
- pressure
- throttle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
Links
- 238000002347 injection Methods 0.000 title claims description 41
- 239000007924 injection Substances 0.000 title claims description 41
- 239000000446 fuel Substances 0.000 title claims description 39
- 238000002485 combustion reaction Methods 0.000 title claims description 19
- 238000007789 sealing Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
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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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
- F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
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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
- 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
- F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
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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
- 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
- F02M63/0077—Valve seat details
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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
- 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
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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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/28—Details of throttles in fuel-injection apparatus
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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
- F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
- F02M2547/001—Control chambers formed by movable sleeves
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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
- 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
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
-
- 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
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
Definitions
- the invention relates to a fuel injection valve for internal combustion engines, as it is used for fuel injection into the combustion chamber of an internal combustion engine.
- Fuel injection valves as they are preferably used for fuel injection directly into the combustion chamber of an internal combustion engine, are known from the prior art.
- compressed fuel is made available in a rail by means of a high-pressure pump and injected by means of injectors into the respective combustion chambers of an internal combustion engine.
- the injection is controlled by means of a nozzle needle, which performs a longitudinal movement and thereby opens and closes one or more injection openings. Since it is not useful or not possible to move the nozzle needle directly by an electric actuator, in particular in the injection of fuel under high pressure, hydraulic forces exerted by the compressed fuel on the nozzle needle, used for driving.
- a control chamber is formed in the fuel injection valve, the pressure of which acts directly or indirectly on the nozzle needle and thereby presses against a nozzle seat, so that the nozzle needle closes the injection openings.
- the fuel pressure in the control chamber is influenced by means of a control valve, wherein the control chamber is alternately connected to a low-pressure chamber or this connection is interrupted by the control valve.
- a fuel injection valve which has such a control valve.
- the control valve is designed here as a so-called 3/2-way valve and controls the connection of the control chamber on the one hand to the high pressure source, from which the compressed fuel is supplied to the injection valve, and on the other hand to a low pressure chamber.
- the control valve has a control valve member, which can be moved by means of an electrical actuator, such as a magnet or a piezoelectric actuator, within the control valve chamber and thus cooperates with a first control valve seat and a second control valve seat.
- control valve member If the control valve member is in contact with the first control valve seat, the connection of the control valve chamber to the low-pressure chamber or a leakage connection, which has a connection to a low-pressure region, is closed.
- the control chamber is connected via an inlet throttle with the high-pressure passage and via an outlet throttle with the control valve chamber.
- Another example is from the EP 2 019 198 A2 known.
- the fuel injection valve according to the invention with the features of claim 1 has the advantage that during the injection process substantially only the amount of fuel that is necessary to reduce the pressure in the control chamber, must be dissipated in the low pressure space. This increases the efficiency of the fuel injection valve while reducing the heat input in the actuator and return system. The fuel consumption of the internal combustion engine is thus reduced.
- the fuel injection valve to a pressure chamber in which a nozzle needle is arranged longitudinally displaceable, wherein the nozzle needle cooperates by its longitudinal movement with a nozzle seat and thereby opens at least one injection port and closes, wherein the nozzle needle directed by the pressure in a control chamber in the direction of the nozzle seat Closing force experiences.
- a control valve is provided, through which the pressure in the control chamber is adjustable, wherein the control valve comprises a connectable to the control chamber control valve chamber, in which a control valve member is arranged longitudinally movable.
- the control valve chamber is connected to the control chamber via an outlet throttle and to the pressure chamber via an inlet throttle.
- the control valve chamber is connected via a bypass with the control room.
- the control valve member can open and close the bypass and the inlet throttle.
- the opening behavior of the nozzle needle can be determined via the design of inlet throttle and bypass, the closing behavior and the design of the outlet throttle.
- control valve member is designed so that it opens the bypass and the inlet throttle when it rests against a first control valve seat and closes the connection between the control valve chamber and a low-pressure chamber, and when connected to a second control valve seat, the connection between the control valve chamber and opens the low pressure chamber and closes the bypass and the inlet throttle.
- the second control valve seat is formed on a throttle plate, wherein the outlet throttle, the bypass and the inlet throttle are also formed in the throttle plate.
- the control valve element Bypass and inlet throttle can be opened and closed directly in a compact and easy-to-manufacture design.
- a sleeve delimits the control chamber from a high-pressure-carrying pressure chamber and simultaneously guides the nozzle needle during the opening and closing movement. Due to this simple yet reliable design, the nozzle-side openings of the bypass and the inlet throttle can be designed such that the bypass opens into the control chamber and the inlet throttle into the pressure chamber. In addition, for different settings, the volume of the control room can be easily varied.
- Fig. 1 shows a longitudinal section through a fuel injection valve according to the invention, wherein only the essential areas are shown schematically.
- Fig. 1 schematically shows a fuel injection valve 11 according to the invention in longitudinal section.
- the fuel injection valve 11 has a valve body 4 and a nozzle body 8 , which are braced against each other with the interposition of a throttle plate 6 by means of a tensioning device, not shown.
- a pressure chamber 14 is formed, in which a piston-shaped nozzle needle 10 is arranged longitudinally displaceable.
- the nozzle needle 10 has at its end facing the combustion chamber on a sealing surface 15 , with which it cooperates with a nozzle seat 13 which is formed at the combustion chamber end of the pressure chamber 14 .
- nozzle seat 13 From the nozzle seat 13 go from one or more injection ports 12 , which open in installation position of the fuel injection valve 11 directly into a combustion chamber of an internal combustion engine.
- the nozzle needle 10 is pressed against the nozzle seat 13 by a closing spring 18, which acts on a shoulder 16 and is biased against the throttle plate 6 via a sleeve 22 .
- the sleeve 22 simultaneously serves to guide the longitudinal movement of the nozzle needle 10 and delimits a control chamber 20 from the pressure chamber 14 .
- a control valve 30 comprising a control valve chamber 31, a control valve member 34, two control valve seats 37 and 39 and a spring 38th arranged.
- the control valve member 34 which can be moved via an actuator 41 arranged in a low-pressure chamber 40 is arranged longitudinally displaceable in the control valve chamber 31 and forms at a sealing edge 50 with the valve body 4, a first control valve seat 37 and at a sealing surface 51 with the throttle 6, a second control valve seat 39 off.
- the throttle plate 6 serves as an abutment for the spring 38, which surrounds the control valve member 34 and this is acted upon by a force in the direction of the low pressure space 40 .
- the control valve chamber 31 is connected via the outlet throttle 1 to the control chamber 20 and via the inlet throttle 3 to the pressure chamber 14 .
- the control valve chamber 31 is connected via the bypass 2 with the control chamber 20 .
- the control valve member 34 can open and close the bypass 2 and the inlet throttle 3 and, on the other hand, the connection of the control valve chamber 31 to the low-pressure chamber 40 .
- the low-pressure space 40 is without pressure or only at a very low pressure level, so that only very small forces are exerted on the control valve member 34 by it.
- a high fuel pressure as it also prevails in the high pressure passage 25 .
- Characterized is the control valve member 34 in contact with the first control valve seat 37.
- the fuel pressure in the control chamber 20 is exerted on the nozzle seat facing away from end face of the nozzle needle 10 a hydraulic force in the direction of the nozzle seat 13, which presses the nozzle needle 10 against the nozzle seat. 13 Since the nozzle needle 10 is in contact with the nozzle seat 13 , the pressure chamber 14 is sealed against the injection openings 12 , so that no fuel from the pressure chamber 14 can get into the combustion chamber of the internal combustion engine.
- the fuel flowing from the control chamber 20 via the outlet throttle 1 into the control valve chamber 31 also leads to a pressure drop in the control chamber 20 .
- the fuel pressure dissipating in the control chamber 20 leads to a reduced hydraulic force on the nozzle seat facing away from the end face of the nozzle needle 10, so that the hydraulic forces acting through the pressure in the pressure chamber 14 on the nozzle needle 10, in particular on parts of the sealing surface 15 , that the nozzle needle 10 lifts off from the nozzle seat 13 and is moved counter to the force of the closing spring 18 in the direction of the valve body 4 .
- a gap is opened between the sealing surface 15 and the nozzle seat 13 , flows through the fuel from the pressure chamber 14 to the injection openings 12 and is injected through the injection openings 12 in a combustion chamber of the internal combustion engine.
- control valve member 34 is moved back into abutment against the first control valve seat 37 by means of the actuator 41 .
- the connection of the control valve chamber 31 with the low-pressure chamber 40 is interrupted.
- the sealing surface 51 lifts off from the second control valve seat 39 , so that the control valve chamber 31 is connected via the inlet throttle 3 to the high-pressure-carrying pressure chamber 14 .
- the control valve chamber 31 is in turn connected both via the outlet throttle 1 and now also via the bypass 2 with the control chamber 20 .
- a high fuel pressure quickly builds up again in control valve chamber 31 and control chamber 20 .
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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 Erfindung betrifft ein Kraftstoffeinspritzventil für Brennkraftmaschinen, wie es zur Kraftstoffeinspritzung in den Brennraum einer Brennkraftmaschine verwendet wird.The invention relates to a fuel injection valve for internal combustion engines, as it is used for fuel injection into the combustion chamber of an internal combustion engine.
Kraftstoffeinspritzventile, wie sie vorzugsweise zur Kraftstoffeinspritzung direkt in den Brennraum einer Brennkraftmaschine verwendet werden, sind aus dem Stand der Technik bekannt. Bei Einspritzsystemen, die nach dem sogenannten Common-Rail-Prinzip arbeiten, wird mittels einer Hochdruckpumpe verdichteter Kraftstoff in einem Rail zur Verfügung gestellt und mittels Injektoren in die jeweiligen Brennräume einer Brennkraftmaschine eingespritzt. Die Einspritzung wird mittels einer Düsennadel gesteuert, die eine Längsbewegung ausführt und dadurch eine oder mehrere Einspritzöffnungen öffnet und schließt. Da es insbesondere bei der Einspritzung von Kraftstoff unter hohem Druck nicht sinnvoll oder nicht möglich ist, die Düsennadel direkt durch einen elektrischen Aktor zu bewegen, werden hydraulische Kräfte, die der verdichtete Kraftstoff auf die Düsennadel ausübt, zur Ansteuerung verwendet. Hierzu ist im Kraftstoffeinspritzventil ein Steuerraum ausgebildet, dessen Druck direkt oder indirekt auf die Düsennadel wirkt und sie dadurch gegen einen Düsensitz presst, so dass die Düsennadel die Einspritzöffnungen verschließt. Durch Änderung des Drucks im Steuerraum und damit der Schließkraft auf die Düsennadel kann die Längsbewegung der Düsennadel gezielt gesteuert werden.Fuel injection valves, as they are preferably used for fuel injection directly into the combustion chamber of an internal combustion engine, are known from the prior art. In injection systems which operate according to the so-called common rail principle, compressed fuel is made available in a rail by means of a high-pressure pump and injected by means of injectors into the respective combustion chambers of an internal combustion engine. The injection is controlled by means of a nozzle needle, which performs a longitudinal movement and thereby opens and closes one or more injection openings. Since it is not useful or not possible to move the nozzle needle directly by an electric actuator, in particular in the injection of fuel under high pressure, hydraulic forces exerted by the compressed fuel on the nozzle needle, used for driving. For this purpose, a control chamber is formed in the fuel injection valve, the pressure of which acts directly or indirectly on the nozzle needle and thereby presses against a nozzle seat, so that the nozzle needle closes the injection openings. By changing the pressure in the control chamber and thus the closing force on the nozzle needle, the longitudinal movement of the nozzle needle can be controlled specifically.
Der Kraftstoffdruck im Steuerraum wird mittels eines Steuerventils beeinflusst, wobei der Steuerraum abwechselnd mit einem Niederdruckraum verbunden wird oder diese Verbindung wird durch das Steuerventil unterbrochen. Aus der
Bei dem Steuerventil aus der
Ein weiteres Beispiel ist aus der
Vorteile der Erfindung Das erfindungsgemäße Kraftstoffeinspritzventil mit den Merkmalen des Patentanspruchs 1 weist demgegenüber den Vorteil auf, dass während des Einspritzvorganges im Wesentlichen nur die Menge an Kraftstoff, die zur Druckerniedrigung im Steuerraum notwendig ist, in den Niederdruckraum abgeführt werden muss. Dadurch erhöht sich die Effizienz des Kraftstoffeinspritzventils bei gleichzeitiger Verringerung des Wärmeeintrags in Aktor und Rücklaufsystem. Der Kraftstoffverbrauch der Brennkraftmaschine wird somit verringert.Advantages of the invention The fuel injection valve according to the invention with the features of
Dazu weist das Kraftstoffeinspritzventil einen Druckraum auf, in dem eine Düsennadel längsverschiebbar angeordnet ist, wobei die Düsennadel durch ihre Längsbewegung mit einem Düsensitz zusammenwirkt und dadurch wenigstens eine Einspritzöffnung öffnet und schließt, wobei die Düsennadel durch den Druck in einem Steuerraum eine in Richtung des Düsensitzes gerichtete Schließkraft erfährt. Weiter ist ein Steuerventil vorhanden, durch welches der Druck im Steuerraum einstellbar ist, wobei das Steuerventil einen mit dem Steuerraum verbindbaren Steuerventilraum umfasst, in dem ein Steuerventilglied längsbewegbar angeordnet ist. Der Steuerventilraum ist über eine Ablaufdrossel mit dem Steuerraum und über eine Zulaufdrossel mit dem Druckraum verbunden. Weiter ist der Steuerventilraum über einen Bypass mit dem Steuerraum verbunden. Das Steuerventilglied kann den Bypass und die Zulaufdrossel öffnen und schließen.For this purpose, the fuel injection valve to a pressure chamber in which a nozzle needle is arranged longitudinally displaceable, wherein the nozzle needle cooperates by its longitudinal movement with a nozzle seat and thereby opens at least one injection port and closes, wherein the nozzle needle directed by the pressure in a control chamber in the direction of the nozzle seat Closing force experiences. Further, a control valve is provided, through which the pressure in the control chamber is adjustable, wherein the control valve comprises a connectable to the control chamber control valve chamber, in which a control valve member is arranged longitudinally movable. The control valve chamber is connected to the control chamber via an outlet throttle and to the pressure chamber via an inlet throttle. Next, the control valve chamber is connected via a bypass with the control room. The control valve member can open and close the bypass and the inlet throttle.
Aufgrund des Verschließens der Zulaufdrossel durch das Steuerventilglied strömt während des Einspritzvorgangs kein Kraftstoff aus dem Druckraum in den Steuerventilraum nach, so dass der Verlust an verdichtetem Kraftstoff minimiert wird. Zusätzlich kann über die Auslegung von Zulaufdrossel und Bypass das Schließverhalten und über die Auslegung der Ablaufdrossel das Öffnungsverhalten der Düsennadel bestimmt werden.Due to the closing of the inlet throttle by the control valve member, no fuel flows from the pressure space into the control valve chamber during the injection process, so that the loss of compressed fuel is minimized. In addition, the opening behavior of the nozzle needle can be determined via the design of inlet throttle and bypass, the closing behavior and the design of the outlet throttle.
In einer vorteilhaften Ausgestaltung der Erfindung ist das Steuerventilglied so ausgebildet, dass es bei Anlage an einem ersten Steuerventilsitz den Bypass und die Zulaufdrossel öffnet und die Verbindung zwischen dem Steuerventilraum und einem Niederdruckraum schließt, und bei Anlage an einem zweiten Steuerventilsitz die Verbindung zwischen dem Steuerventilraum und dem Niederdruckraum öffnet und den Bypass und die Zulaufdrossel verschließt. Das ermöglicht eine geringe Absteuermenge zum Start des Einspritzvorgangs und eine schnelle Druckerhöhung im Steuerraum zur Beendigung des Einspritzvorgangs.In an advantageous embodiment of the invention, the control valve member is designed so that it opens the bypass and the inlet throttle when it rests against a first control valve seat and closes the connection between the control valve chamber and a low-pressure chamber, and when connected to a second control valve seat, the connection between the control valve chamber and opens the low pressure chamber and closes the bypass and the inlet throttle. This allows a low Absteuermenge to start the injection process and a rapid pressure increase in the control room to end the injection process.
In einer weiteren vorteilhaften Ausgestaltung ist der zweite Steuerventilsitz an einer Drosselscheibe ausgebildet, wobei die Ablaufdrossel, der Bypass und die Zulaufdrossel ebenfalls in der Drosselscheibe ausgebildet sind. Bei diesem kompakten und leicht zu fertigenden Aufbau kann das Steuerventilglied Bypass und Zulaufdrossel direkt öffnen und verschließen.In a further advantageous embodiment, the second control valve seat is formed on a throttle plate, wherein the outlet throttle, the bypass and the inlet throttle are also formed in the throttle plate. In this The control valve element Bypass and inlet throttle can be opened and closed directly in a compact and easy-to-manufacture design.
In einer weiteren vorteilhaften Ausgestaltung grenzt eine Hülse den Steuerraum von einem hochdruckführenden Druckraum ab und führt gleichzeitig die Düsennadel bei der Öffnungs- und Schließbewegung. Durch diesen einfachen und gleichzeitig zuverlässigen Aufbau können die düsenseitigen Öffnungen von Bypass und Zulaufdrossel so ausgebildet werden, dass der Bypass in den Steuerraum mündet und die Zulaufdrossel in den Druckraum. Zudem kann für verschiedene Einstellungen das Volumen des Steuerraums leicht variiert werden.In a further advantageous embodiment, a sleeve delimits the control chamber from a high-pressure-carrying pressure chamber and simultaneously guides the nozzle needle during the opening and closing movement. Due to this simple yet reliable design, the nozzle-side openings of the bypass and the inlet throttle can be designed such that the bypass opens into the control chamber and the inlet throttle into the pressure chamber. In addition, for different settings, the volume of the control room can be easily varied.
Im Ventilkörper 4 ist ein Steuerventil 30 umfassend einen Steuerventilraum 31, ein Steuerventilglied 34, zwei Steuerventilsitze 37 und 39 und eine Feder 38 angeordnet. Das Steuerventilglied 34, das über einen in einem Niederdruckraum 40 angeordneten Aktor 41 bewegt werden kann, ist im Steuerventilraum 31 längsverschiebbar angeordnet und bildet an einer Dichtkante 50 mit dem Ventilkörper 4 einen ersten Steuerventilsitz 37 und an einer Dichtfläche 51 mit der Drosselscheibe 6 einen zweiten Steuerventilsitz 39 aus. An ihrem ventilkörperseitigen Ende dient die Drosselscheibe 6 als Anlage für die Feder 38, die das Steuerventilglied 34 umgibt und dieses mit einer Kraft in Richtung des Niederdruckraums 40 beaufschlagt. An ihrem düsenkörperseitigen Ende grenzt die Drosselscheibe 6 sowohl an den Druckraum 14 als auch an den Steuerraum 20. In der Drosselscheibe 6 sind sowohl eine Ablaufdrossel 1, ein Bypass 2 und eine Zulaufdrossel 3, als auch eine Hochdruckbohrung 26, die den Druckraum 14 mit dem Hochdruckkanal 25 verbindet, ausgebildet. Dabei ist der Steuerventilraum 31 über die Ablaufdrossel 1 mit dem Steuerraum 20 und über die Zulaufdrossel 3 mit dem Druckraum 14 verbunden. Weiter ist der Steuerventilraum 31 über den Bypass 2 mit dem Steuerraum 20 verbunden. Das Steuerventilglied 34 kann einerseits den Bypass 2 und die Zulaufdrossel 3 und andererseits die Verbindung des Steuerventilraums 31 zum Niederdruckraum 40 öffnen und schließen.In the
Die Funktionsweise des Kraftstoffeinspritzventils ist wie folgt: Zu Beginn der Einspritzung ist der Niederdruckraum 40 ohne Druck oder nur auf einem sehr geringen Druckniveau, so dass durch ihn nur sehr geringe Kräfte auf das Steuerventilglied 34 ausgeübt werden. Im Steuerraum 20 und im Steuerventilraum 31 liegt ein hoher Kraftstoffdruck an, wie er auch im Hochdruckkanal 25 herrscht. Dadurch befindet sich das Steuerventilglied 34 in Anlage am ersten Steuerventilsitz 37. Durch den Kraftstoffdruck im Steuerraum 20 wird auf die düsensitzabgewandte Stirnseite der Düsennadel 10 eine hydraulische Kraft in Richtung auf den Düsensitz 13 ausgeübt, der die Düsennadel 10 gegen den Düsensitz 13 drückt. Da die Düsennadel 10 in Anlage am Düsensitz 13 ist, wird der Druckraum 14 gegen die Einspritzöffnungen 12 abgedichtet, so dass kein Kraftstoff aus dem Druckraum 14 in den Brennraum der Brennkraftmaschine gelangen kann.The operation of the fuel injection valve is as follows: At the beginning of the injection, the low-
Soll eine Einspritzung erfolgen, wird mittels des Aktors 41 das Steuerventilglied 34 vom ersten Steuerventilsitz 37 weg in Anlage an den zweiten Steuerventilsitz 39 gedrückt. Dadurch wird zwischen der Dichtkante 50 des Steuerventilglieds 34 und dem ersten Steuerventilsitz 37 eine Verbindung aufgesteuert, die den Steuerventilraum 31 mit dem Niederdruckraum 40 verbindet. Durch die Anlage des Steuerventilglieds 34 am zweiten Steuerventilsitz 39 werden über die Dichtfläche 51 des Steuerventilglieds 34 die Zulaufdrossel 3, und damit die Verbindung des Steuerventilraums 31 zum Druckraum 14, und der Bypass 2 geschlossen. In dieser Stellung des Steuerventils 30 fällt der Druck wegen des abfließenden Kraftstoffs im Steuerventilraum 31 rasch ab. Der aus dem Steuerraum 20 über die Ablaufdrossel 1 nachströmende Kraftstoff in den Steuerventilraum 31 führt auch im Steuerraum 20 zu einem Druckabfall. Der sich im Steuerraum 20 abbauende Kraftstoffdruck führt zu einer verminderten hydraulischen Kraft auf die düsensitzabgewandte Stirnfläche der Düsennadel 10, so dass die hydraulischen Kräfte, die durch den Druck im Druckraum 14 auf die Düsennadel 10, insbesondere auf Teile der Dichtfläche 15 wirken, dazu führen, dass die Düsennadel 10 vom Düsensitz 13 abhebt und entgegen der Kraft der Schließfeder 18 in Richtung des Ventilkörpers 4 bewegt wird. Hierdurch wird zwischen der Dichtfläche 15 und dem Düsensitz 13 ein Spalt aufgesteuert, durch den Kraftstoff aus dem Druckraum 14 zu den Einspritzöffnungen 12 fließt und durch die Einspritzöffnungen 12 in einen Brennraum der Brennkraftmaschine eingespritzt wird.If an injection is to take place, by means of the
Zur Beendigung der Einspritzung wird mittels des Aktors 41 das Steuerventilglied 34 zurück in Anlage an den ersten Steuerventilsitz 37 bewegt. Dadurch wird die Verbindung des Steuerventilraums 31 mit dem Niederdruckraum 40 unterbrochen. Gleichzeitig hebt die Dichtfläche 51 vom zweiten Steuerventilsitz 39 ab, so dass der Steuerventilraum 31 über die Zulaufdrossel 3 mit dem hochdruckführenden Druckraum 14 verbunden wird. Der Steuerventilraum 31 ist wiederum sowohl über die Ablaufdrossel 1 als jetzt auch über den Bypass 2 mit dem Steuerraum 20 verbunden. Dadurch baut sich in Steuerventilraum 31 und Steuerraum 20 rasch wieder ein hoher Kraftstoffdruck auf.To end the injection, the
Bei Beendigung der Einspritzung kommt es wegen der Befüllung des Steuerraums 20 sowohl durch die Ablaufdrossel 1 als auch den Bypass 2 zu einem sehr raschen Druckanstieg im Steuerraum 20. Das Druckabbauverhalten kann über die Ablaufdrossel 1 gestaltet werden, das Druckaufbauverhalten über die Zulaufdrossel 3 und den Bypass 2. Upon completion of the injection, it comes because of the filling of the
Claims (4)
- Fuel injection valve for internal combustion engines for injecting fuel at high pressure, having a pressure chamber (14) in which a nozzle needle (10) is arranged in longitudinally displaceable fashion, wherein the nozzle needle (10), by means of its longitudinal movement, interacts with a nozzle seat (13) and thereby opens and closes at least one injection opening (12), and wherein the nozzle needle (10) is subjected, by the pressure in a control chamber (20), to a closing force directed in the direction of the nozzle seat (13), and having a control valve (30) which is formed in a valve body (4) and by means of which the pressure in the control chamber (20) is adjustable, wherein the control valve (30) comprises a control valve chamber (31) which is connectable to the control chamber (20) and in which a control valve element (34) is arranged in longitudinally movable fashion, and having an outflow throttle (1), which connects the control chamber (20) to the control valve chamber (31), and an inflow throttle (3), which connects the pressure chamber (14) switchably to the valve chamber (31),
characterized
in that the control valve chamber (31) is connectable to the control chamber (20) by means of a bypass (2), wherein the control valve element (34) can open and close the bypass (2) and the inflow throttle (3). - Fuel injection valve according to Claim 1, characterized in that the control valve element (34), when abutting against a first control valve seat (37), opens the bypass (2) and the inflow throttle (3) and closes the connection between the control valve chamber (31) and a low-pressure chamber (40), and when abutting against a second control valve seat (39), opens the connection between the control valve chamber (31) and the low-pressure chamber (40) and closes the bypass (2) and the inflow throttle (3).
- Fuel injection valve according to Claim 2, characterized in that the second control valve seat (39) is formed on a throttle disk (6), and in that the outflow throttle (1), the bypass (2) and the inflow throttle (3) are formed in the throttle disk (6).
- Fuel injection valve according to Claim 1, characterized in that a sleeve (22) delimits the control chamber (20).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013206383.0A DE102013206383A1 (en) | 2013-04-11 | 2013-04-11 | Fuel injection valve for internal combustion engines |
PCT/EP2014/052642 WO2014166651A1 (en) | 2013-04-11 | 2014-02-11 | Fuel injection valve for internal combustion engines |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2984328A1 EP2984328A1 (en) | 2016-02-17 |
EP2984328B1 true EP2984328B1 (en) | 2018-04-11 |
Family
ID=50073196
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14703854.1A Not-in-force EP2984328B1 (en) | 2013-04-11 | 2014-02-11 | Fuel injection valve for internal combustion engines |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2984328B1 (en) |
CN (1) | CN105102804B (en) |
DE (1) | DE102013206383A1 (en) |
WO (1) | WO2014166651A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106593719A (en) * | 2017-01-18 | 2017-04-26 | 哈尔滨工程大学 | Resonant bypass electric-controlled oil injector |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10205970A1 (en) * | 2002-02-14 | 2003-09-04 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
DE10353169A1 (en) * | 2003-11-14 | 2005-06-16 | Robert Bosch Gmbh | Injector for injecting fuel into combustion chambers of internal combustion engines, in particular piezo-controlled common rail injector |
JP2007205324A (en) * | 2006-02-06 | 2007-08-16 | Denso Corp | Fuel injection valve |
DE102006057025A1 (en) * | 2006-12-04 | 2008-06-05 | Robert Bosch Gmbh | Fuel injector for injecting fuel into combustion chamber of internal combustion engine, has pressure-compensating magnetic valve with valve element that opens or locks valve seat, where valve element or piece of valve has spherical surface |
DE102007034318A1 (en) * | 2007-07-24 | 2009-01-29 | Robert Bosch Gmbh | injector |
DE102009000283A1 (en) * | 2008-02-04 | 2009-08-06 | Robert Bosch Gmbh | Fuel injector, particularly common-rail injector for injecting fuel into combustion chamber of internal-combustion engine, has sealing edge that is formed at front wall of injection valve element |
DE102008001330A1 (en) | 2008-04-23 | 2009-10-29 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engines |
-
2013
- 2013-04-11 DE DE102013206383.0A patent/DE102013206383A1/en not_active Withdrawn
-
2014
- 2014-02-11 CN CN201480019989.9A patent/CN105102804B/en not_active Expired - Fee Related
- 2014-02-11 WO PCT/EP2014/052642 patent/WO2014166651A1/en active Application Filing
- 2014-02-11 EP EP14703854.1A patent/EP2984328B1/en not_active Not-in-force
Also Published As
Publication number | Publication date |
---|---|
DE102013206383A1 (en) | 2014-10-16 |
EP2984328A1 (en) | 2016-02-17 |
CN105102804A (en) | 2015-11-25 |
CN105102804B (en) | 2018-04-27 |
WO2014166651A1 (en) | 2014-10-16 |
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