WO2009098100A1 - Injecteur, procédé et dispositif de commande d'un injecteur - Google Patents

Injecteur, procédé et dispositif de commande d'un injecteur Download PDF

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Publication number
WO2009098100A1
WO2009098100A1 PCT/EP2009/050149 EP2009050149W WO2009098100A1 WO 2009098100 A1 WO2009098100 A1 WO 2009098100A1 EP 2009050149 W EP2009050149 W EP 2009050149W WO 2009098100 A1 WO2009098100 A1 WO 2009098100A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
injection valve
nozzle body
actuator
nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2009/050149
Other languages
German (de)
English (en)
Inventor
Maximilian Kronberger
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.)
Aumovio Germany GmbH
Original Assignee
Continental Automotive Technologies 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 Continental Automotive Technologies GmbH filed Critical Continental Automotive Technologies GmbH
Publication of WO2009098100A1 publication Critical patent/WO2009098100A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • 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
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive 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
    • 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
    • F02M61/08—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 the valves opening in direction of fuel flow
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/80—Constructional details
    • H10N30/88—Mounts; Supports; Enclosures; Casings
    • 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
    • F02M2200/707—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with means for avoiding fuel contact with actuators, e.g. isolating actuators by using bellows or diaphragms
    • 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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/167—Means for compensating clearance or thermal expansion

Definitions

  • the invention relates to an injection valve and a method and a device for controlling an injection valve.
  • Vehicles are arranged, make it necessary to take various measures by which the pollutant emissions are reduced.
  • One starting point here is to reduce the pollutant emissions generated by the internal combustion engine.
  • the formation of soot is highly dependent on the preparation of the air / fuel mixture in the respective cylinder of the internal combustion engine.
  • a correspondingly improved mixture preparation can be achieved if the fuel is metered under very high pressure.
  • the fuel pressures are up to over 2000 bar.
  • Such high pressures make high demands on the design of an injection valve.
  • high demands are placed on the actuator unit for the injection valve.
  • DE 196 53 555 A1 discloses a piezoelectric actuator with a housing, into which at least one piezoelectric element is introduced, which can be controlled by a control unit, wherein means are provided which laterally stabilize the piezoelectric element and means are arranged with spring action which bias the piezoelectric element against its extension direction.
  • DE 102 45 109 discloses an injector having a piezoelectric actuator body, the lateral surface of which is surrounded by an injector housing while maintaining an intermediate space and cooled by direct contact with an inert, electrically non-conductive fluid.
  • the object of the invention is to provide an injection valve and a method and a device for controlling an injection valve, by which or through which a reliable and precise operation of the injection valve is made possible.
  • the invention is characterized by an injection valve with a nozzle assembly and an actuator unit.
  • the nozzle assembly has a nozzle body with a nozzle body recess which can be hydraulically coupled to a high-pressure circuit of a fluid, and a nozzle needle arranged axially movably in the nozzle body recess, which is designed to prevent a fluid flow through at least one injection opening in a closed position and otherwise to release the fluid flow.
  • the actuator unit has a sleeve-shaped housing with a longitudinal axis, which has a housing recess, wherein the sleeve-shaped housing is mechanically fixedly coupled to the nozzle body and the housing recess is hydraulically coupled to the nozzle body recess, such that the housing recess is hydraulically connected to the high pressure circuit of the fluid can be coupled, a cover member which is fixedly coupled to an axial end facing away from the nozzle body of the sleeve-shaped housing, and a piezoelectric actuator, in the housing recess is arranged, is designed to act on the nozzle needle and has a head end portion at an axial end facing away from the nozzle needle.
  • the head end section of the piezoactuator is coupled directly to the cover element.
  • the housing is formed from one or more materials which are designed in such a way that the thermal expansion coefficient of a housing section which surrounds the piezoactuator and / or the piezoactuator and a compensation element arranged axially and fixedly coupled to the piezoactuator, essentially corresponding to that of the piezoactuator or that of the piezoactuator and the compensation element.
  • the advantage of this arrangement is that the construction of the injection valve with a small number of components is possible.
  • a hydraulic compensator for temperature compensation can be dispensed with.
  • a common recess of housing recess and nozzle body recess By a common recess of housing recess and nozzle body recess, a relatively large volume of fluid can be achieved in the injector. This achieves a high stability of the injection volumes, in particular in the case of multiple injections.
  • the housing is formed of an Invar alloy.
  • Invar alloys are a group of alloys and compounds that have the property of having very small positive or sometimes negative thermal expansion coefficients in certain temperature ranges. The name results from the invariance of the strain with respect to a temperature change. Invar alloys have high mechanical strength and can be welded. A commonly used Invar alloy is a FeNi alloy with one Nickel content of 36% nickel. By alloying with 5% cobalt, the thermal expansion coefficient can be further reduced. In addition, many other alloys are known in which an Invar effect occurs.
  • Housing made of an Invar alloy in particular housing for an actuator of an injection valve of an internal combustion engine, have the advantage that only a small change in length of the housing takes place when the temperature changes.
  • the coefficient of thermal expansion of the housing made of an Invar alloy can correspond to the thermal expansion coefficient of the piezoactuator, so that no or only slight mechanical stresses, forces or changes in position occur between the housing and the piezoactuator.
  • the nozzle needle is coupled directly to the piezoactuator, such that the nozzle needle and the piezoactuator are movable relative to each other in a same direction.
  • an actuator housing having an inner space is arranged in the housing recess, and the piezoactuator is arranged in the inner space, and the inner space is sealed fluid-tight with respect to the housing recess.
  • the actuator housing has a bellows, which is designed such that axial changes in length of the piezo actuator can be accommodated by the actuator housing. This has the advantage that in the case of a piezo actuator fixedly coupled to the actuator housing, axial length changes of the piezoactuator can be absorbed directly by the actuator housing by means of the bellows.
  • the bellows is arranged coaxially between the piezoactuator and the housing and is fixedly coupled to the cover element with an axial end facing away from the nozzle body.
  • the piezoactuator has a bottom element on an axial end facing the nozzle body, and the bellows is fixedly coupled to the bottom element with the axial end facing the nozzle body.
  • the bellows is arranged axially between the piezoactuator and the injection opening.
  • the actuator housing has a tubular element which is arranged coaxially between the piezoactuator and the housing. An axial end of the tubular element facing away from the nozzle body is fixedly coupled to the cover element and an axial end of the tubular element facing the nozzle body is fixedly coupled to an axial end of the bellows facing the nozzle body.
  • the actuator housing has a perforated disk, and the perforated disk is coupled directly to the axial end of the pipe element facing the nozzle body and directly to the axial end of the bellows facing the nozzle body.
  • the perforated disc has a recess and the bellows has an inner bellows chamber.
  • the bottom element has a pin extension which extends in the recess and in the bellows chamber.
  • Pen extension relative to the housing provides a particularly favorably arranged surface for measuring the idle stroke of the actuator unit.
  • Compensating element on the pin extension, and the pin extension has a material that has a higher thermal expansion coefficient than steel.
  • Such materials are preferably Mn-Cu-Ni alloys, the composition Mn72Cul8NilO being particularly preferred. This has the
  • the housing may preferably be formed of a steel and that the compensation of the thermal expansion of the housing and the piezoelectric actuator requires no additional length of the injector.
  • the interior of the actuator housing is at least partially filled with a fluid, and the fluid is made of a material which comprises a silicone.
  • Silicone enables a mechanical stabilization The quality of the bellows even at higher fluid pressures.
  • Another advantage is that silicone have a high thermal conductivity, and so a good heat dissipation is made possible by the piezoelectric actuator.
  • the nozzle body and the housing are releasably coupled together.
  • the nozzle body and the housing are releasably coupled to one another by means of a screw connection. This has the advantage that a simple assembly and disassembly of the nozzle body and the housing is possible.
  • a sealing element is arranged axially between the nozzle body and the housing. It can be achieved as a high fluid tightness between the contact surfaces of the nozzle body and the housing.
  • the axial arrangement of the sealing element between the nozzle body and the housing allows a high process reliability during assembly of the sealing element.
  • the nozzle needle has at least two guide sections, each with a flat recess, wherein the guide sections are designed such that the nozzle needle can be guided through the nozzle body in the axial direction.
  • the guide sections are designed such that the nozzle needle can be guided through the nozzle body in the axial direction.
  • the head end section of the piezoactuator has an electrical connection line, by means of which the piezoactuator can be electrically coupled to a voltage source, and the cover element has a glass feedthrough, and the electrical connection line is arranged in the glass feedthrough.
  • the glass feedthrough By means of the glass feedthrough, a fluid-tight passage of the electrical connection line of the piezo actuator through the cover element can be achieved.
  • the invention is characterized by an apparatus for controlling an injection valve according to the first aspect, comprising means for determining the reaching of the closing position of the nozzle needle.
  • the means for determining the reaching of the closed position of the nozzle needle are designed for determining the time profile of electrical variables on the piezoactuator.
  • the invention is characterized by a method for controlling an injection valve according to the first aspect, wherein the achievement of the closing position of the nozzle needle is determined by determining a time profile of electrical variables on the piezo actuator.
  • the closing position of the nozzle needle can be determined very precisely. Furthermore, an adaptive be used to compensate for changes over time in the elongation of the piezo actuator. This also achieves a high long-term stability of the operating behavior of the injection valve.
  • FIG. 1 shows a first embodiment of an injection valve in longitudinal section
  • Figure 2 shows another embodiment of the injection valve in longitudinal section
  • FIG. 3 shows a partial region of the injection valve in longitudinal section.
  • Figures 1 and 2 show an injection valve 10 with an actuator 14 and a nozzle assembly 60.
  • the injection valve 10 is preferably used for use as a fuel injection valve for an internal combustion engine of a vehicle.
  • the actuator unit 14 has a sleeve-shaped housing 12 with a housing recess 13, in which a piezoactuator 16 is arranged.
  • the housing 12 is preferably made of an Invar alloy.
  • the Invar alloy has a nickel content of about 36%.
  • the piezoactuator 16 has at least one piezoelectric element 17, which changes its length in the axial direction, depending on a control signal which is applied to the piezoactuator 16.
  • the nozzle assembly 60 comprises a nozzle body 30 having a longitudinal axis A and a nozzle body recess 32 extending in the axial direction in the nozzle body 30. At a free end of the nozzle body recess 32, a fluid outlet 28 is formed, which is in the open or closed position, depending on the axial position of a nozzle needle 33.
  • the injection valve 10 further has a high pressure port 20 in which a fluid inlet 26 is formed.
  • a connecting channel 27 is further formed by means of which the fluid inlet 26 is hydraulically coupled to the housing recess 13 of the housing 12 and to the nozzle body recess 32.
  • the high pressure port 20 is coupled to the fluid inlet 26 to a high pressure chamber of an internal combustion engine, in which the fuel is stored under a certain pressure, for example under a pressure of about 200 bar.
  • the nozzle body 30 has a shoulder 34 and the nozzle needle 33 has a shoulder 35, wherein both paragraphs 34, 35 serve as a support for a spring 24 which is disposed between the nozzle body 30 and the nozzle needle 33.
  • the nozzle needle 33 is coupled directly to the piezoelectric actuator 16 without the interposition of a deflection device.
  • the nozzle needle 33 and the piezoactuator 16 thus move relative to one another in a same direction.
  • the injection valve 10 is formed as an outwardly opening valve.
  • the piezoactuator 16 On its end facing away from the nozzle assembly 60, the piezoactuator 16 has a head end section 42 with a cover element 18 which adjoins the piezoelement 17.
  • the housing recess 13 has an inner wall 15.
  • the piezoactuator 16 has a bottom element 19 on an axial end facing the nozzle body 30. The bottom element 19 is fixedly coupled to the bellows 40 of the actuator housing 36.
  • the head end portion 42 of the piezoactuator 16 further comprises an electrical connection line 44 for the supply of electrical energy to the piezoactuator 16.
  • the piezoactuator 16 changes its length in the axial direction when an electrical voltage is applied to it. By changing the length of the piezo actuator 16, a force can be exerted on the nozzle needle 33. Via the force exerted by the piezoactuator 16, the nozzle needle 33 can move in the axial direction so as to enable or prevent fluid flow through an injection port 62.
  • the actuator unit 14 for the injection valve 10 further has a connection plug 56 with a plug body 57, in which a connection pin 58 is arranged. Via the connection plug 56, a voltage can be applied to the connection pin 58 of the connection plug 56.
  • the connection pin 58 of the connection plug 56 and the electrical connection line 44 of the piezoactuator 16 together form an electrical connection. End of the piezoelectric actuator 16. Since the connecting pin 58 of the connector plug 56 is electrically coupled to the connecting line 44 of the piezoelectric actuator 16, a supply of electrical energy from the outside to the piezoelectric actuator 16 is possible in a simple manner.
  • an actuator housing 36 is arranged with an inner space 38, in which the piezoelectric actuator 16 is arranged.
  • the piezoactuator 16 is thus accommodated in the actuator housing 36 in a mechanically stable manner.
  • the actuator housing 36 has a bellows 40, which in
  • Piezoaktuators 16 can be recorded directly from the fixedly coupled to the piezoelectric actuator 16 actuator housing 36.
  • the bellows 40 is arranged coaxially between the piezoactuator 16 and the housing 12.
  • the bellows 40 is fixedly coupled to the cover element 18 with an axial end facing away from the nozzle body 30.
  • the bellows 40 is fixedly coupled to the nozzle body 30 axial end facing the bottom member 19.
  • the piezoactuator 16 is fixedly coupled to a glass feedthrough 45.
  • the electrical connection line 44 is arranged in the glass feedthrough 45, as a result of which a fluid-tight passage of the electrical connection line 44 of the piezoactuator 16 through the cover element 18 can be achieved.
  • the bellows 40 is arranged axially between the piezoactuator 16 and the injection opening 62.
  • the actuator housing 36 has a tubular element 46, which is arranged coaxially between the piezoactuator 16 and the housing 12.
  • the tubular element 46 extends with its axial end facing away from the nozzle body 30 up to its axial end facing the nozzle body 30 from the cover element 18 to a perforated disc 64.
  • the perforated disc 64 extends with the axial end of the tubular element 46 facing the nozzle body 30 and fixedly coupled to the nozzle body facing the axial end of the bellows 40.
  • the end remote from the nozzle body 30 of the tubular element 46 is fixedly coupled to the lid member 18.
  • the bellows 40 is disposed within the tubular member 46.
  • the radial dimensions of the bellows 40 can be formed independently of the radial dimensions of the piezoactuator 16.
  • the radial extent of the bellows 40 may be smaller than the radial extent of the piezoelectric actuator 16.
  • the hydraulically effective surface in the direction of the longitudinal axis A is very small, whereby a short piezoelectric actuator 16 may be used in the injection valve 10. This has the advantage that a lower energy consumption and thus a lower thermal load of the piezoelectric actuator 16 can be achieved.
  • the perforated disc 64 has a recess 65 and the bellows 40 has an inner bellows chamber 66.
  • a pin extension 68 is arranged in the recess 65 of the perforated disc 64 and in the inner bellows 66 .
  • the pin extension 68 is fixed, preferably in one piece, coupled to the bottom element 19.
  • the bottom element 19 and the pin extension 68 together form a compensation element 70.
  • the compensation element 70 can compensate for changes in length of the tubular element 46 serve, in particular when the housing 12 is formed of a material having a higher coefficient of thermal expansion than the piezoelectric actuator 16.
  • the compensation element 70 is then preferably designed such that its thermal expansion coefficient is significantly greater than the thermal expansion coefficient of the housing 12th , and that its thermal expansion coefficient in conjunction with the thermal expansion coefficients of the piezoelectric actuator 16 is just as large as the coefficient of thermal expansion of the housing 12.
  • the thermal expansion of a housing section 12a, the piezoactuator 16 and the Compensating element 70 encloses is substantially the same size as the thermal expansion of the piezoelectric actuator 16 with the compensation element 70 together.
  • the interior 38 of the actuator housing 36 is preferably at least partially filled with a fluid.
  • the fluid in the interior 38 of the actuator housing 36 is preferably non-conductive and chemically innert. It is particularly preferred if the fluid in the interior 38 of the actuator housing is made of a material which comprises a silicone. This can be ensured on the one hand that the bellows 40 reaches a good mechanical stability even at higher fluid pressures.
  • the fluid in the interior space 38 of the actuator housing 36 can furthermore permit heat flow from the piezoactuator 16 in the direction of the housing 12 and thus heat removal in a lateral direction from the piezoactuator 16 to reach.
  • a screw 50 between the nozzle body 30 and the housing 12 can be made.
  • the threaded connection 50 allows for easy disassembly of the nozzle body 30 from the housing 12. This is particularly advantageous when either the nozzle assembly 60 or the actuator unit 14 has a defective or mismatched unit. It is then possible to replace the defective or mismatched nozzle assembly 60 or the defective or mismatched actuator unit 14 without having to replace the entire injection valve 10. This leads in particular to low costs in the production of the injection valve 10.
  • a sealing element 52 is preferably arranged, which allows an axial seal between the nozzle body 30 and the housing 12. It can be achieved as a good fluid tightness between the contact surfaces of the nozzle body 30 and the housing 12.
  • the axial arrangement of the sealing element 52 between the nozzle body 30 and the housing 12 in particular allows high process reliability during assembly of the sealing element 52.
  • the nozzle body 30 has a lower nozzle body part 30a and an upper nozzle body part 30b.
  • the lower nozzle body part 30a is preferably non-positively connected to the upper nozzle body part 30b, for example by a press fit.
  • a further sealing element 53 is provided, so that a seal in the radial direction is made possible.
  • the nozzle needle 33 preferably has two guide portions 54, each with a flat recess 55.
  • the guide portions 54 are formed so that the nozzle needle 33 can be guided through the nozzle body 30 in the axial direction. This is a very secure management of the nozzle needle 33 in the nozzle body 30th possible. At the same time, a high fluid flow in the direction of the fluid outlet 28 in the region of the injection opening 62 is possible due to the flat recesses 55.
  • the fuel is conducted from the fluid inlet 26 through the housing 12 to the nozzle body recess 32 and finally to the fluid outlet 28.
  • a fluid flow from the fluid inlet 26 into the interior 38 of the actuator housing 36 with the piezoactuator 16 is prevented by the bellows 40 or the tube element 46 and the perforated disc 64.
  • the piezoelectric elements 17 can change their length. Due to the change in length of the piezoelectric elements 17, a force can be exerted on the nozzle needle 33.
  • the nozzle needle 33 can thus be moved in the axial direction from its closed position. Outside the closed position of the nozzle needle 33 there is a gap between the nozzle body 30 and the nozzle needle 33 at the injection opening 62. Outside the closed position of the nozzle needle 33, the nozzle needle 33 allows a fluid flow through the fluid outlet 28 and thus through the injection opening 62.
  • nozzle needle 33 in the direction of the piezoelectric actuator 16 with force. If no voltage is applied to the piezoactuator 16, the length of the piezoactuator 16 is reduced.
  • the spring 24 forces the nozzle needle 33 to move in the axial direction Direction in its closed position. Depending on the balance of forces between the force exerted on the nozzle needle 33 by the spring 24 and the force exerted on the nozzle needle 33 by the piezoactuator 16, the nozzle needle 33 is in a closed position or in an open position.
  • the piezoactuator 16 If the nozzle needle 33 is brought from an open position to a closed position, the piezoactuator 16 is de-energized, a change in length of the Piezoaktua- gate 16 is triggered by the piezoelectric actuator 16 contracts. At the same time, by the force exerted by the spring 24 on the nozzle needle 33 force the nozzle needle 33 try to get into its closed position. Since the change in length of the piezoelectric actuator 16 phase first faster and then slower than the movement of the nozzle needle 33 in its closed position, a force change is exerted on the piezoelectric actuator 16, whereby an electrical signal can be applied to the piezoelectric actuator 16. From the time course of this electrical signal can be determined when the nozzle needle 33 actually reaches its closed position. The information thus obtained about the achievement of the closed position of the nozzle needle 33 can be utilized as information in a next opening operation of the nozzle needle 33, such that a corresponding signal is applied to the piezoactuator 16, and this one to the determined
  • Closed position of the nozzle needle 33 can perform adapted change in length.
  • Such an adaptive control is possible for the opening and closing operation of the nozzle needle 33 by means of the piezoactuator 16.
  • FIG. 3 The method for measuring the actuator idling stroke of the injection valve 10 in accordance with the embodiment shown in FIG. 2 is shown below (FIG. 3):
  • the axial position of a first planar surface 72 on the pin extension 68 and a second planar surface 74 on the housing 12 is determined.
  • the axial distance Sl between the first plane surface 72 and the second plane surface 74 is determined.
  • the axial position of a third plane surface 76 of the nozzle needle 33 and a fourth plane surface 78 of the nozzle body 30 are determined.
  • the axial distance S2 between the third planar surface 76 and the fourth planar surface 78 is determined.
  • the spacings Sl of the actuator unit 14 and S2 of the nozzle assembly 60 are compared with one another, and an actuator unit 14 and a nozzle assembly 60, which have values of the distances S1 and S2 that are as similar as possible, are paired with one another. Since the flat surfaces 72, 74, 76, 78 are very easily accessible for a measurement of the actuator idle stroke, the actuator idle stroke can be determined with a high accuracy, in the range of a few tenths of a micrometer.

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

Abstract

L'invention concerne un injecteur (10) comprenant un module buse (60) et un ensemble actionneur (14). Le module buse (60) présente un corps de buse (30) pourvu d'un évidement de corps de buse (32), pouvant être relié hydrauliquement à un circuit haute pression d'un fluide, et une aiguille de buse (33) montée axialement mobile dans l'évidement (32) du corps de buse, laquelle aiguille de buse peut empêcher un flux de fluide à travers au moins un orifice d'injection (62) lorsqu'elle se trouve dans une position de fermeture et libérer le flux de fluide dans le cas contraire. L'ensemble actionneur (14) comporte un boîtier (12) présentant un axe longitudinal (A) et un évidement de boîtier (13), le boîtier (12) étant relié de manière rigide au corps de buse (30) et l'évidement de boîtier (13) étant relié hydrauliquement à l'évidement de corps de buse (32), de sorte que l'évidement de boîtier (13) peut être relié hydrauliquement au circuit haute pression du fluide.
PCT/EP2009/050149 2008-02-08 2009-01-08 Injecteur, procédé et dispositif de commande d'un injecteur Ceased WO2009098100A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008008111A DE102008008111A1 (de) 2008-02-08 2008-02-08 Einspritzventil, Verfahren und Vorrichtung zur Steuerung eines Einspritzventils
DE102008008111.6 2008-02-08

Publications (1)

Publication Number Publication Date
WO2009098100A1 true WO2009098100A1 (fr) 2009-08-13

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DE (1) DE102008008111A1 (fr)
WO (1) WO2009098100A1 (fr)

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DE102008041544B4 (de) * 2008-08-26 2016-05-12 Robert Bosch Gmbh Ventil zur Zumessung eines flüssigen oder gasförmigen Mediums
WO2011045298A1 (fr) * 2009-10-12 2011-04-21 Ulrich Stieler Kunststoff Service E.K. Injecteur de fluide
DE102009046989A1 (de) * 2009-11-23 2011-05-26 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102010014208A1 (de) * 2010-04-08 2011-10-13 Continental Automotive Gmbh Verfahren und Vorrichtung zum Betreiben eines Einspritzventils
EP2378107A1 (fr) * 2010-04-19 2011-10-19 Delphi Technologies Holding S.à.r.l. Agencement d'actionneur à utiliser dans un injecteur de carburant
EP2698527A1 (fr) * 2012-08-16 2014-02-19 Continental Automotive GmbH Ensemble de soupape pour soupape dýinjection et soupape dýinjection

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DE19912666A1 (de) * 1999-03-20 2000-09-21 Bosch Gmbh Robert Brennstoffeinspritzentil
DE102004012863A1 (de) * 2003-03-17 2004-10-28 Denso Corp., Kariya Piezoelektrischer Aktuator
DE102005063010A1 (de) * 2005-12-30 2007-07-05 Robert Bosch Gmbh Aktormodul
EP1820960A2 (fr) * 2006-02-15 2007-08-22 Robert Bosch Gmbh Soupape d'injection de carburant

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