EP2369165A2 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP2369165A2
EP2369165A2 EP11154810A EP11154810A EP2369165A2 EP 2369165 A2 EP2369165 A2 EP 2369165A2 EP 11154810 A EP11154810 A EP 11154810A EP 11154810 A EP11154810 A EP 11154810A EP 2369165 A2 EP2369165 A2 EP 2369165A2
Authority
EP
European Patent Office
Prior art keywords
nozzle needle
actuator
actuator unit
hydraulic
fuel injector
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.)
Withdrawn
Application number
EP11154810A
Other languages
German (de)
English (en)
Other versions
EP2369165A3 (fr
Inventor
Martin Kessler
Matthias Burger
Keir Foster
Oliver Rain
Marco Beier
Herbert Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2369165A2 publication Critical patent/EP2369165A2/fr
Publication of EP2369165A3 publication Critical patent/EP2369165A3/fr
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0614—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature
    • F02M51/0617—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature having two or more electromagnets
    • 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
    • F02M63/0059—Arrangements of valve actuators
    • F02M63/0063—Two or more actuators acting on a single valve body
    • 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
    • F02M63/0059—Arrangements of valve actuators
    • F02M63/0066—Combination of electromagnetic and piezoelectric or magnetostrictive actuators
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/704—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with actuator and actuated element moving in different directions, e.g. in opposite directions

Definitions

  • the invention relates to a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine with the features of the preamble of claim 1. Furthermore, the invention relates to a method for controlling a liftable nozzle needle of a fuel injector with the features of the preamble of claim 10.
  • Fuel injectors of the type mentioned above are used for example for diesel direct injection, wherein the pressure of the hydraulic medium to be injected (diesel fuel) can be up to 2500bar.
  • the injection takes place via at least one injection opening of the fuel injector, which can be opened or closed by the lifting movement of a nozzle needle.
  • the nozzle needle assumes a position in which it is largely balanced with force. This means that uniform pressure conditions prevail and the pressure forces acting on the nozzle needle are largely compensated.
  • This closing force can be in the range of some 100 Newtons.
  • a powerful actuator is required, which is able to overcome the force acting on the nozzle needle closing force.
  • magnetic actuators or solid-state actuators such as piezo actuators
  • the actuation can be directly or indirectly, ie with the interposition of a control valve for controlling a nozzle needle applied control pressure.
  • the indirect needle control has the disadvantage that a regulated amount of fuel must be supplied to a return to control the control pressure.
  • the indirect needle control over the direct needle control tends to be carrier.
  • the direct needle control requires to overcome the force acting on the nozzle needle high closing force a particularly powerful actuator. Preference is given here piezo actuators use, by means of which high actuating forces for lifting the nozzle needle can be realized. After lifting the nozzle needle, the high-pressure fuel flows under the nozzle needle, so that adjusts a hydraulic force balance. The requirements on the actuator with regard to the required restoring force therefore decrease significantly. At the same time, the actuator must have sufficient travel to ensure complete opening of the nozzle needle. The latter is difficult to represent with a piezoelectric actuator.
  • the object of the present invention is to provide a fuel injector with multiple actuators, which has a high flexibility with regard to the operating point of the actuators.
  • a method for controlling a nozzle needle of a fuel injector is to be specified, which allows optimization of the operating point setting of the actuators.
  • the proposed fuel injector for injecting fuel into the combustion chamber of an internal combustion engine comprises a first actuator unit and at least one further actuator unit for actuating a liftable nozzle needle, by the lifting movement of which at least one injection port of the fuel injector is releasable or closable.
  • the actuator units are independently controllable and coupled via a coupling device to the nozzle needle.
  • the coupling device comprises a hydraulic coupler volume which is delimited by a hydraulic active surface formed on the nozzle needle and at least one further hydraulic active surface which is formed on a transmission element interacting with an actuator unit so that the area ratio of the hydraulic active surfaces in a first phase of the Opening stroke of the nozzle needle, a power amplification and / or in a second phase of the opening stroke of the nozzle needle Wegverstärkung is effected.
  • An inventive fuel injector thus has at least two actuator units, of which at least one is coupled via a hydraulic coupler volume to the nozzle needle.
  • this actuator unit interacts with a transmission element which has a hydraulic effective area delimiting the coupler volume, so that depending on the respective chosen surface ratios of the hydraulic active surfaces, a force and / or a path gain can be realized.
  • a suitable actuator so that both magnetic actuators and solid state actuators can be used.
  • at least one first actuator or a first actuator unit is coupled to the nozzle needle via the hydraulic coupler volume, and the hydraulic active surface of the transmission element cooperating with the first actuator unit is selected such that a force amplification is achieved.
  • the first actuator unit is preferably activated at the beginning of the opening stroke of the nozzle needle in order to lift the nozzle needle out of its seat against the high closing force.
  • the main advantage of the invention is therefore that on the one hand the tasks are distributed to multiple actuators and on the other hand qualitatively different actuators can be combined in such a way that their performance corresponds to the actual requirements.
  • the necessary force or Wegan scholaren can be met.
  • Each actuator unit provides only a part of the required power for this purpose. If necessary, a force and / or displacement transmission can also be realized via the coupling device.
  • the hydraulic coupler volume serving as a coupling device also enables the compensation of thermal strains, which can have critical and undesired effects on the force profile of the actuators.
  • the compensation of thermal strains in turn leads to an improved stability of the system.
  • the proposed injector concept thus proves to be very efficient and extremely flexible, in particular with regard to the possible combinations of different actuators.
  • a force and / or travel gain can be realized via the proposed coupling device.
  • the fuel injector according to the invention can also be used for direct needle control, so that further the advantages of the direct needle control mentioned above for carrying come.
  • the specified Injektorogue is simple and inexpensive to implement.
  • the actuator units each comprise at least one magnetic actuator or a solid-state actuator, for example a piezoactuator or a magnetostrictive actuator whose force is effective in the opening direction of the nozzle needle or in a direction opposite to the opening direction.
  • piezoelectric actuators have the advantage over magnetic actuators that they can apply high forces and have high dynamics.
  • solid state actuators are particularly suitable for the formation of a first actuator unit, which is activated at the beginning of the opening stroke of the nozzle needle to overcome the force acting on the nozzle needle high closing force.
  • the use of piezo actuators makes it difficult to display the required strokes.
  • at least one solenoid actuator is used, the activation of which takes place in a second phase of the opening stroke of the nozzle needle in order to ensure complete opening of the nozzle needle.
  • the direction of action of the actuators is freely selectable, that is, both "pulling” or effective in the opening direction of the nozzle needle, as well as “oppressive” or against the opening direction of the nozzle needle effective actuators can be used.
  • This is made possible by using a hydraulic coupler volume as a coupling device, since the direction of action of the actuator unit can be deflected onto the nozzle needle via the hydraulic coupler volume.
  • the proposed injector concept also has a high degree of flexibility with regard to the specific design of the fuel injector, since the installation position of the actuators can be selected independently of the longitudinal axis of the nozzle needle.
  • the Injektorgeometrie can be adapted accordingly to the respective space conditions.
  • an actuator unit may comprise one or more actuators that are combined to form an assembly.
  • the term actuator unit thus includes individual actuators as well as actuator assemblies.
  • At least two actuator units are provided for actuating the nozzle needle, which are effective in the same direction or in the opposite direction. This means that “pulling” and “pushing” actuators can be combined. The effective direction of the actuator force is deflected via the hydraulic coupler volume.
  • the inventively provided division of the actuator performance on a plurality of actuators or actuator units includes versions with three or more actuators.
  • an injector concept with two actuators or actuator units is considered to be particularly advantageous in order to minimize the outlay for coupling the actuators or actuator units to the nozzle needle.
  • two actuator units which can be controlled independently of one another can be coupled to the nozzle needle via a hydraulic coupler volume, wherein the coupler volume is defined by a hydraulic active surface A 1 , which is formed on a transmission element cooperating with the first actuator unit, and by a hydraulic active surface A 2 , which is formed on a cooperating with the second actuator unit transfer element, as well as a formed on the nozzle needle hydraulic active surface AN is limited and wherein the area ratios A 1 / A N ⁇ 1 and A 2 / A N > 1 are selected.
  • this actuator also has a high dynamics.
  • flat armature magnetic circuits are therefore used.
  • solid-state actuators such as piezo actuators or magnetostrictive actuators, can also be used as first actuators or first actuator units.
  • solid-state actuators it should be noted that these are usually inhibited by tension and pressure against externally induced strain. Therefore, when using solid-state actuators, ensure that they do not inhibit each other or work on each other.
  • the further actuator unit is preferably activated only after overcoming the force acting on the nozzle needle high closing force by the first actuator unit.
  • the power requirements are low.
  • a second actuator therefore, for example, a solenoid plunger is suitable.
  • the Huban soup with good linearity via a voice coil assembly can be displayed.
  • the force of a voice coil drive would not be sufficient.
  • the use of a voice coil drive as a second actuator unit is acceptable. Due to the also low requirements in terms of dynamics of the second actuator unit, an actuator can also be used whose force is built up slowly, while a first high-dynamic actuator unit with high momentary force is required for opening the nozzle needle impulse.
  • the second actuator unit via the hydraulic coupler volume is preferably coupled to the nozzle needle, which causes a stroke or Wegverstärkung.
  • the hydraulic active surface A 2 of a cooperating with the second actuator unit transmission element is this larger than the formed on the nozzle needle hydraulic active surface AN selected.
  • the effective area ratio is accordingly A 2 / A N > 1.
  • At least one cooperating with an actuator unit transmission element is bolt or sleeve-shaped.
  • a transmission element is preferably designed in the shape of a bolt and received in the further, preferably sleeve-shaped transmission element such that a displacement of both transmission elements relative to each other is possible.
  • the bolt-shaped transmission element then has a circular hydraulic active surface and the sleeve-shaped transmission element on an annular hydraulsiche effective surface.
  • the displaceably guided in the sleeve-shaped transmission element bolt-shaped transmission element is further preferably connected to the first actuator unit.
  • the diameter of the bolt-shaped transmission element is chosen smaller than the diameter of the nozzle needle in each case in the region of the hydraulic active surfaces, a force amplification is effected in a simple manner via the hydraulic coupler volume.
  • the annular hydraulic active surface of the sleeve-shaped transmission element is greater than the hydraulic effective area of the nozzle needle to be selected, if alternatively or additionally a path gain is to be realized.
  • the transmission element may also be integrally formed with the respective actuator unit or connected as a separate component with this non-positively and / or positively.
  • the coupling device further comprises means for mechanically coupling an actuator unit to the nozzle needle.
  • the means can be designed such that the coupling of the actuator unit to the nozzle needle is limited in time or over a certain distance.
  • the means for mechanically coupling an actuator unit to the nozzle needle may comprise, for example, a driver edge formed on the nozzle needle or on an actuator of the actuator unit.
  • the driving edge may be formed on the nozzle needle, with which the nozzle needle bears against an actuator of the first actuator unit during a first phase of its opening stroke. Upon activation of the first actuator unit, the opening of the nozzle needle is then effected via the movement of the actuator.
  • the mechanical coupling via the driving edge is preferably released again when the force requirements decrease and the activation of the second actuator unit takes place whose task is to ensure the complete stroke of the nozzle needle.
  • the second actuator unit is preferably designed such that it is able to follow the entire needle movement.
  • the second actuator unit remains coupled to the nozzle needle during the entire needle movement. The coupling can again take place via the hydraulic coupler volume or mechanically.
  • the stroke stop can also for Decoupling of an actuator unit is used by the nozzle needle, so that the actuator unit or an actuator of the actuator unit of the movement of the nozzle needle in a certain phase of the nozzle needle stroke is unable to follow. This prevents that the actuators inhibit each other and / or work done to each other. This danger exists in particular if at least two actuator units are coupled to the nozzle needle via the same hydraulic coupler volume.
  • At least one spring element for returning the nozzle needle, the transmission elements and / or the actuator of an actuator unit is also provided.
  • the spring element can also be used to hold a transmission element or an actuator of an actuator in abutment with a stroke stop until the activation of the respective actuator unit. Accordingly, this measure can also be used to largely prevent cross-influencing of the actuator units with one another.
  • a method for controlling a hubbeweglichen nozzle needle of a fuel injector is further proposed, wherein for controlling the nozzle needle, a first actuator unit and at least one further actuator unit are used, which are coupled via a coupling device to the nozzle needle.
  • At least one actuator unit is coupled to the nozzle needle via a hydraulic coupler volume of the coupling device, the hydraulic coupler volume being limited by a hydraulic active surface formed on the nozzle needle and at least one further hydraulic active surface which is formed on a transmission element cooperating with an actuator unit the area ratio of the hydraulic active surfaces in a first phase of the opening stroke of the nozzle needle, a force amplification and / or in a second phase of the opening stroke of the nozzle needle, a path gain can be effected.
  • the above-described fuel injector according to the invention is particularly suitable.
  • the method provides for the use of at least two actuator units, of which at least one is coupled to the realization of a force or displacement transmission via a hydraulic coupler volume to the nozzle needle.
  • the division of the Aktoran Kunststoffen on at least two actuators allows the most accurate operating point setting of the individual actuators that matched the actual performance profile is.
  • any actuators can be combined with each other to allow an optimization of injector design.
  • the use of a hydraulic coupler volume as a coupling device not only allows a force and / or path gain, but also a deflection of the actuator force on the nozzle needle, so that both "pulling" and “pushing” actuators can be used.
  • the installation position of an actuator unit is thus independent of the position of the nozzle needle.
  • Fig. 1 to 4 Two different actuators or actuator units 1, 2 are used, of which at least one actuator unit 2 is coupled via a hydraulic coupler volume 6 as a coupling device 5 to a nozzle needle 3 for the realization of the injector concept shown different operating principles of a fuel injector.
  • an actuator unit 1 is coupled to the nozzle needle 3 via a driver edge 11 formed on the nozzle needle 3 as a means 9 for mechanical coupling.
  • the arrows indicate in each case the effective direction or direction of movement of the actuator units 1, 2 and the nozzle needle 3 again.
  • both actuator units 1, 2 act "pulling", ie the effective direction of the actuator units 1, 2 corresponds to the opening direction of the nozzle needle 3 (see arrows).
  • each actuator unit 1, 2 cooperates with a transmission element 7, 8, to which a hydraulic active surface A 1 , A 2 for limiting the hydraulic Coupler volume 6 is formed.
  • a further limitation is experienced by the hydraulic coupler volume 6 through a hydraulic active surface AN, which is formed on the nozzle needle 3.
  • the force or Wegverstärkung is achieved by the respective area ratios.
  • the hydraulic effective area A 1 of the cooperating with the first actuator unit 1 transmission element 7 is smaller than the effective area AN of the nozzle needle 3 and the hydraulic effective area A 2 of the cooperating with the second actuator unit 2 transmission element 8 is greater than the hydraulic effective area AN of the nozzle needle 3 selected.
  • the embodiments of the 3 and 4 is a coupling device 5 can be seen, which moreover comprises means 9 for the mechanical coupling of the first actuator unit 1 to the nozzle needle 3.
  • the mechanical coupling is effected in the present case via a driving edge 11 on the nozzle needle 3.
  • the mode of action of such an injector principle is as follows: In the closed position of the nozzle needle, the latter is in contact with an actuator 10 of the first actuator unit 1 via the driver edge 11. If the first actuator unit 1 is activated to open the nozzle needle 1, the actuator 10 of the first actuator unit 1 moves in the direction of the arrow, that is to say in the opening direction of the nozzle needle 3. In this case, the nozzle needle 3 is entrained.
  • the embodiments of the 3 and 4 differ only in terms of the effective direction of the two actuator units 1, 2.
  • the effective direction of the actuator units 1 and 2 is chosen to be opposite, wherein the effective direction of the first actuator unit 1 corresponds to the opening direction of the nozzle needle 3.
  • the effective direction of both actuator units 1, 2 corresponds to the opening direction of the nozzle needle 3.
  • the fuel injector has a first actuator unit 1 in the form of a magnetostrictive actuator and a second actuator unit 2 in the form of a flat armature magnet. Both actuators 1, 2 are coupled via a hydraulic coupling volume 6 as a coupling device 5 to a hubbewegliche nozzle needle 3, via the lifting movement of an injection port 4 of the fuel injector is releasable or closable.
  • the fuel under high pressure is supplied to the injection port 4 via a high-pressure bore 17.
  • the two actuator units 1, 2 are arranged one behind the other in the axial direction, the actuator unit 2 being closer to the injection opening 4.
  • the second actuator unit 2 designed as a flat armature magnet has, in addition to the armature as an actuator 10, a sleeve-shaped transmission element 8 which is fixedly connected to the armature. Through the sleeve-shaped transmission element 8, a further transmission element 7 is guided, which is bolt-shaped and connected to an actuator 10 of the first actuator unit 1. An actuation of the first actuator unit 1 thus causes an axial displacement of the bolt-shaped transmission element 7 relative to the sleeve-shaped transmission element 8, provided that the second actuator unit 2 is not actuated.
  • the sleeve-shaped transmission element 8 including the actuator 10 is held in contact with a stroke stop 12, which is designed as a shoulder in the injector body 16.
  • the stroke stop 12 prevents both actuator units 1, 2 inhibit each other in the work to be done or perform the work together.
  • the actuator 10 of the magnetostrictive actuator is counter to the spring force of a spring element 14 designed as a plate spring in the opening direction the nozzle needle 3 is moved.
  • the bolt-shaped transmission element 7 is moved in the opening direction of the nozzle needle 3.
  • the hydraulic coupler volume 6, which is axially limited by an end face of the pin-shaped transmission element 7, increases, which has a pressure drop and finally the opening of the nozzle needle 3 result.
  • the end face of the bolt-shaped transmission element 7 is smaller than the hydraulic coupler volume 6 limiting end face of the nozzle needle 3 is selected, so that an area ratio of the hydraulic active surfaces A 1 / A N ⁇ 1 and thus an increase in force during the first phase of the opening stroke of the nozzle needle. 3 results.
  • the also the hydraulic coupler volume limiting hydraulic active surface A 2 which is formed on the sleeve-shaped transmission element 8, unfolds during this first phase of the opening stroke of the nozzle needle 3 has no effect, since the stroke stop 12 and the spring element 15 prevent displacement of the sleeve-shaped transmission element 8. If the nozzle needle 3 is lifted out of its seat by activation of the first actuator unit 1, the second actuator unit 2 is activated.
  • the actuator 10 and the magnet armature including the sleeve-shaped transmission element 8 is moved against the pressure force of the spring element 15 in the opening direction of the nozzle needle 3.
  • the hydraulic coupler volume 6 is further increased. Since the hydraulic effective area A 2 on the sleeve-shaped transmission element 8 is greater than the hydraulic effective area AN of the nozzle needle 3 is selected, so that an area ratio A 2 / A N > 1 results, during a second phase of the opening stroke of the nozzle needle 3 is a Wegverstärkung.
  • the bolt-shaped transmission element 7 is reset via the pressure force of the spring element 14 Transfer element 7 displaced volume, however, designed to be significantly smaller than the volume of the sleeve-shaped transmission element 8, this cross-influencing is negligible.
  • the first actuator unit 1 remain activated during the entire opening stroke of the nozzle needle 3. If the activation of both actuator units 1, 2 ends, the nozzle needle 3 is returned to its seat via the pressure force of a spring element 13.
  • the coupling device 5 may further comprise means 9 for the mechanical coupling of an actuator unit 1 to the nozzle needle 3.
  • the nozzle needle 3 has a driving edge 11 as the means 9 for mechanical coupling.
  • the in the Fig. 6 embodiment shown accordingly corresponds to the operating principle of Fig. 4 , Again, two actuator units 1, 2 are provided which act "pulling", ie in the opening direction of the nozzle needle 3. This time, however, the first actuator unit 1 is arranged closer to the injection port 4, since the coupling of the first actuator unit 1 to the nozzle needle 3 via the means. 9 ie mechanically.
  • the second actuator unit 2 is according to the embodiment of Fig.
  • the active hydraulic surface A 2 of a cooperating with the actuator unit 2 transmission element 7 is greater than the hydraulic effective area AN of the nozzle needle 3 is selected. Accordingly, a path gain is achieved via the area ratio A 2 / A N > 1.
  • the first actuator unit 1 is energized first, the actuating element 10 rests against the driving edge 11 of the nozzle needle 3.
  • the energization of the first actuator unit 1 causes a displacement of the actuating element 10 in the opening direction of the nozzle needle 3, wherein the nozzle needle 3 is raised via the driving edge 11.
  • the nozzle needle 3 is now undercut by fuel under high pressure, so that adjusts a hydraulic force balance. To effect a complete opening of the nozzle needle 3, it no longer requires a large force, but a large stroke. Therefore, now the second actuator unit 2 is activated. While the bolt-shaped transmission element 7 of the actuator unit 2 remains coupled to the nozzle needle 3 via the hydraulic coupler volume 6, the nozzle needle 3 is released from the actuator 10 of the first actuator unit 1. Thus, a decoupling of the first actuator unit 1 occurs. As a result, a transverse influence of the two actuator units 1, 2 is prevented. In order to prevent an inhibition of the bolt-shaped transmission element 7, further arranged above the transmission element 7 hydraulic volume is connected directly to the high pressure. The same applies to the hydraulic needle surrounding the nozzle needle 3.
  • the actuator 10 of the first actuator unit 1 While the activation of the second actuator unit 2 causes the complete opening stroke of the nozzle needle 3, the actuator 10 of the first actuator unit 1 is not moved beyond its stroke stop 12 addition. If the energization of both actuators 1, 2 ended, the nozzle needle 3 is returned by the pressing force of the spring element 13 in the seat. In this case, the adjusting element 10 of the first actuator unit 1 against the pressure force of a spring element 14, which holds the actuator 10 in abutment with the driving edge 11, returned to its original position.
  • the provision of the bolt-shaped transmission element 7 is effected by a spring element 15.
  • the two in the Fig. 5 and 6 The concrete embodiments illustrated represent only examples of a fuel injector according to the invention.
  • the invention comprises a multiplicity of further combinations of different actuators which are each hydraulically or mechanically coupled to the nozzle needle. There is thus a division of the actuator power to multiple actuators that can be configured or selected according to the requirements.
  • a force and / or displacement transmission is optionally possible with hydraulic coupling of an actuator unit to the nozzle needle via the respective selected area ratio of the hydraulic active surfaces.
  • a force or path reinforcement according to the invention is not absolutely necessary if the design of the actuators does not require this.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP11154810.3A 2010-03-26 2011-02-17 Injecteur de carburant Withdrawn EP2369165A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010003334A DE102010003334A1 (de) 2010-03-26 2010-03-26 Kraftstoffinjektor

Publications (2)

Publication Number Publication Date
EP2369165A2 true EP2369165A2 (fr) 2011-09-28
EP2369165A3 EP2369165A3 (fr) 2017-06-14

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Family Applications (1)

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EP11154810.3A Withdrawn EP2369165A3 (fr) 2010-03-26 2011-02-17 Injecteur de carburant

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EP (1) EP2369165A3 (fr)
DE (1) DE102010003334A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2863044A1 (fr) * 2013-10-15 2015-04-22 Continental Automotive GmbH Soupape d'injection

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030116657A1 (en) 2001-12-26 2003-06-26 Toyota Jidosha Kabushiki Kaisha Solenoid-operated fuel injection valve
WO2006002953A1 (fr) 2004-07-02 2006-01-12 Compact Dynamics Gmbh Soupape d'injection de carburant

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006036781A1 (de) * 2006-08-07 2008-02-14 Robert Bosch Gmbh Injektor und zugehöriges Betriebsverfahren

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030116657A1 (en) 2001-12-26 2003-06-26 Toyota Jidosha Kabushiki Kaisha Solenoid-operated fuel injection valve
WO2006002953A1 (fr) 2004-07-02 2006-01-12 Compact Dynamics Gmbh Soupape d'injection de carburant

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2863044A1 (fr) * 2013-10-15 2015-04-22 Continental Automotive GmbH Soupape d'injection

Also Published As

Publication number Publication date
EP2369165A3 (fr) 2017-06-14
DE102010003334A1 (de) 2011-09-29

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