EP2607680A1 - Verfahren zur Herstellung eines Einspritzventils - Google Patents

Verfahren zur Herstellung eines Einspritzventils Download PDF

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Publication number
EP2607680A1
EP2607680A1 EP11194600.0A EP11194600A EP2607680A1 EP 2607680 A1 EP2607680 A1 EP 2607680A1 EP 11194600 A EP11194600 A EP 11194600A EP 2607680 A1 EP2607680 A1 EP 2607680A1
Authority
EP
European Patent Office
Prior art keywords
valve
valve needle
fluid
outlet portion
armature
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Withdrawn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
EP11194600.0A
Other languages
English (en)
French (fr)
Inventor
Mauro Grandi
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.)
Continental Automotive GmbH
Original Assignee
Continental Automotive 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 GmbH filed Critical Continental Automotive GmbH
Priority to EP11194600.0A priority Critical patent/EP2607680A1/de
Publication of EP2607680A1 publication Critical patent/EP2607680A1/de
Withdrawn legal-status Critical Current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
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
    • 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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8092—Fuel injection apparatus manufacture, repair or assembly adjusting or calibration

Definitions

  • the invention relates to a method for manufacturing an injection valve.
  • Injection valves are in wide spread use, in particular for internal combustion engines where they may be arranged in order to dose the fluid into an intake manifold of the internal combustion engine or directly into the combustion chamber of a cylinder of the internal combustion engine.
  • injection valves are manufactured in various forms in order to satisfy the various needs for the various combustion engines. Therefore, for example, their length, their diameter and also various elements of the injection valve being responsible for the way the fluid is dosed may vary in a wide range.
  • injection valves may accommodate an actuator for actuating a needle of the injection valve, which may, for example, be an electromagnetic actuator or piezo electric actuator.
  • the respective injection valve may be suited to dose fluids under very high pressures.
  • the pressures may be in case of a gasoline engine, for example, in the range of up to 200 bar and in the case of diesel engines in the range of more than 2000 bar.
  • the object of the invention is to provide a method for manufacturing an injection valve which is to be carried out in a simple manner.
  • the invention is distinguished by a method for manufacturing an injection valve.
  • the injection valve comprises a valve body including a central longitudinal axis, the valve body comprises a cavity with a fluid inlet portion and a fluid outlet portion, a valve needle axially movable in the cavity, the valve needle preventing a fluid flow through the fluid outlet portion in a closing position and releasing the fluid flow through the fluid outlet portion in further positions, and an electro-magnetic actuator unit comprising a coil and an armature.
  • the coil is designed to effect an electro-magnetic force on the armature.
  • the armature is axially movable in the cavity and is designed to actuate the valve needle.
  • the method comprises the following steps: providing the injection valve and coupling the injection valve with a fluid supply, actuating the actuator unit by means of a predetermined voltage curve to actuate the valve needle to move between the closing position and a further position to release a fluid flow through the fluid outlet portion, determining an opening time of the valve needle from the closing position to the further position, and adjusting an electric resistance in a series circuit with the coil depending on the determined opening time of the valve needle.
  • the adjustment of the electric resistance is carried out by selecting the electric resistance from a plurality of fixed resistances. This has the advantage that the adjustment of the electric resistance may be carried out in a very simpler manner. Furthermore, a long term stability of the electric resistance may be achieved.
  • a closing time of the valve needle from the further position to the closing position is determined, and the calibration spring is adjusted depending on the determined closing time of the valve needle.
  • Figure 1 shows an injection valve 10 that is in particular suitable for dosing fuel to an internal combustion engine comprises in particular a valve assembly 11 and an inlet tube 12.
  • the valve assembly 11 comprises a valve body 14 with a central longitudinal axis L.
  • the valve assembly 11 has a housing 16 which is partially arranged around the valve body 14.
  • a cavity 18 is arranged in the valve body 14.
  • the cavity 18 takes in a valve needle 20 and an armature 22.
  • the valve needle 20 is axially movable in the cavity 18.
  • a ring element 28 is fixedly coupled to the valve needle.
  • the ring element 28 is formed as a collar around the valve needle 14.
  • the armature 22 is axially movable in the cavity 18.
  • a calibration spring 24 is arranged in a recess 26 which is provided in the inlet tube 12.
  • the calibration spring 24 is mechanically coupled to the valve needle 20.
  • the valve needle 20 forms a first seat for the calibration spring 24.
  • a filter element 30 is arranged inside the inlet tube 12 and forms a further seat for the calibration spring 24.
  • the filter element 30 can be axially moved into the inlet tube 12 in order to preload the calibration spring 24 in a desired manner.
  • the calibration spring 24 exerts a force on the valve needle 20 towards an injection nozzle 34 of the injection valve 10.
  • the injection nozzle 34 may be, for example, an injection hole.
  • the valve assembly 11 is provided with an actuator unit 36 that is preferably an electro-magnetic actuator.
  • the electro-magnetic actuator unit 36 comprises a coil 38, which is preferably arranged inside the housing 16. Furthermore, the electro-magnetic actuator unit 36 comprises the armature 22.
  • the valve body 14, the housing 16, the inlet tube 12 and the armature 22 are forming an electromagnetic circuit.
  • a fluid outlet portion 40 is a part of the cavity 18 near the seat plate 32.
  • the fluid outlet portion 40 communicates with a fluid inlet portion 42 which is provided in the valve body 14.
  • a step 44 is arranged in the valve body 14.
  • an armature support spring 48 is arranged in the cavity 18 axially between the step 44 of the valve body 14 and the armature 22.
  • the armature support spring 48 is a coil spring.
  • the armature support spring 48 is supported by the step 44 in the valve body 14.
  • the armature support spring 48 forms a support element for the armature 22.
  • the actuator unit 36 comprises an electric resistance 52.
  • the electric resistance 52 and the coil 38 are arranged in a series circuit 50.
  • the fluid is led through the filter element 30 in the recess 26 of the inlet tube 12 to the fluid inlet portion 42. Subsequently, the fluid is led towards the fluid outlet portion 40.
  • the valve needle 20 prevents a fluid flow through the fluid outlet portion 40 in a closing position of the valve needle 20. Outside of the closing position of the valve needle 20, the valve needle 20 enables the fluid flow through the fluid outlet portion 40.
  • the actuator unit 36 may affect an electro-magnetic force on the armature 22.
  • the armature 22 is attracted by the electro-magnetic actuator unit 36 with the coil 38 and moves in axial direction away from the fluid outlet portion 40. Due to the mechanical coupling between the armature 22 and the valve needle 20 via the ring element 28 the armature 22 takes the valve needle 20 with it. Consequently, the valve needle 20 moves in axial direction out of the closing position. Outside of the closing position of the valve needle 20 a gap between the seat plate 32 and the valve needle 20 forms a fluid path and fluid can pass through the injection nozzle 34. The increase of the current through the coil 38 during the coil 38 gets energized depends on the resistance value of the electric resistance 52.
  • the calibration spring 24 can force the ring element 28 and the valve needle 20 to move in axial direction towards the injection nozzle 34. Consequently, the valve needle 20 may be forced to move in its closing position. It is depending on the force balance between the force on the valve needle 20 caused by the actuator unit 36 with the coil 38 and the force on the valve needle 20 caused by the calibration spring 24 whether the valve needle 20 is in its closing position or not.
  • a calibration process is carried out to adjust the injection valve 10.
  • the injection valve 10 is coupled with a fluid supply to supply fluid to the fluid inlet portion 26.
  • the actuator unit 36 is actuated by means of a predetermined voltage curve.
  • the actuation of the actuator unit 16 actuates the valve needle 20 to move between the closing position and a further position to release a fluid flow through the fluid outlet portion 40.
  • the opening time of the valve needle 20 between the closing position and the further position is determined.
  • the closing time of the valve needle 20 between the further position and the closing position is determined.
  • the calibration spring 24 is compressed thereby setting the axial preload force of the calibration spring 24 on the valve needle 20. Consequently, by compressing the calibration spring 24 the closing time of the valve needle 20 may be adjusted until it reaches its predetermined value.
  • the electric resistance 52 is adjusted. This may be achieved by selecting the electric resistance 52 from a plurality of fixed resistances. In particular, the adjustment of the electric resistance 52 may be carried out by replacing the electric resistance 52 with one resistance value by an electric resistance 52 with another resistance value.
  • the adjustment of the electric resistance 52 allows to achieve a predetermined opening time of the valve needle 20. Consequently, by adjusting the electric resistance 52 a calibration of the opening time of the valve needle 20 of the injection valve 10 is possible.
  • the injection valve 10 may be calibrated not only by adjusting the load of the calibration spring 24 on the valve needle 20. Rather, adjusting the electric resistance 52 being arranged in the series circuit 50 with the coil 38 allows to calibrate the opening time of the valve needle 20 separately from the closing time of the valve needle 20. This makes it possible to achieve the required dynamic flow of the injection valve 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)
EP11194600.0A 2011-12-20 2011-12-20 Verfahren zur Herstellung eines Einspritzventils Withdrawn EP2607680A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11194600.0A EP2607680A1 (de) 2011-12-20 2011-12-20 Verfahren zur Herstellung eines Einspritzventils

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11194600.0A EP2607680A1 (de) 2011-12-20 2011-12-20 Verfahren zur Herstellung eines Einspritzventils

Publications (1)

Publication Number Publication Date
EP2607680A1 true EP2607680A1 (de) 2013-06-26

Family

ID=45406472

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11194600.0A Withdrawn EP2607680A1 (de) 2011-12-20 2011-12-20 Verfahren zur Herstellung eines Einspritzventils

Country Status (1)

Country Link
EP (1) EP2607680A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5291170A (en) * 1992-10-05 1994-03-01 General Motors Corporation Electromagnetic actuator with response time calibration
EP1467086A1 (de) * 2003-04-08 2004-10-13 Siemens Aktiengesellschaft Brennstoffeinspritzventil mit zwei Einstellhülse und Verfahren zur Einstellung der Vorspannung einer Belastungsfeder eines federbelasteten Einspritzventils
US7407120B1 (en) * 2002-11-21 2008-08-05 Jack French Adjustable racing injector

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5291170A (en) * 1992-10-05 1994-03-01 General Motors Corporation Electromagnetic actuator with response time calibration
US7407120B1 (en) * 2002-11-21 2008-08-05 Jack French Adjustable racing injector
EP1467086A1 (de) * 2003-04-08 2004-10-13 Siemens Aktiengesellschaft Brennstoffeinspritzventil mit zwei Einstellhülse und Verfahren zur Einstellung der Vorspannung einer Belastungsfeder eines federbelasteten Einspritzventils

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