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EP2025923B1 - Verfahren zur Bestimmung der Zusammenstellung einer Ventilnadel und einer Ventilsitzanordnung eines Einspritzventils - Google Patents

Verfahren zur Bestimmung der Zusammenstellung einer Ventilnadel und einer Ventilsitzanordnung eines Einspritzventils Download PDF

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Publication number
EP2025923B1
EP2025923B1 EP20070015380 EP07015380A EP2025923B1 EP 2025923 B1 EP2025923 B1 EP 2025923B1 EP 20070015380 EP20070015380 EP 20070015380 EP 07015380 A EP07015380 A EP 07015380A EP 2025923 B1 EP2025923 B1 EP 2025923B1
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European Patent Office
Prior art keywords
valve
fluid
assembly
fluid flow
needle
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Application number
EP20070015380
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English (en)
French (fr)
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EP2025923A1 (de
Inventor
Mauro Grandi
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Continental Automotive GmbH
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Continental Automotive GmbH
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Priority to EP20070015380 priority Critical patent/EP2025923B1/de
Priority to DE200760013891 priority patent/DE602007013891D1/de
Publication of EP2025923A1 publication Critical patent/EP2025923A1/de
Application granted granted Critical
Publication of EP2025923B1 publication Critical patent/EP2025923B1/de
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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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/001—Measuring fuel delivery of a fuel injector
    • 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
    • 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
    • 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
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for

Definitions

  • the invention relates to a method for determining the capability of a valve needle and a valve seat assembly to control a desired flow rate in an injection valve, and a method for determining a set of a valve needle and a valve seat assembly of an injection valve to obtain a desired flow rate of the 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 up to 2000 bar.
  • EP 1 811 166 A1 discloses a valve assembly for an injection valve, comprising a valve body including a central longitudinal axis, the valve body comprising a cavity with a fluid inlet portion and a fluid outlet portion, and a valve needle axially moveable in the cavity, the valve needle preventing a fluid flow through the outlet portion in a closing position and releasing the fluid flow through the fluid outlet portion in further positions.
  • the valve assembly comprises a fluid flow directing element being arranged in the fluid outlet portion coaxially between the valve body and the valve needle and extending in radial direction away from the valve needle in a way that a fluid flow between the valve needle and the fluid flow directing element is prevented.
  • the object of the invention is to create a method for determining the capability of a valve needle and a valve seat assembly to control a desired flow rate in an injection valve, and a method for determining a set of a valve needle and a valve seat assembly of an injection valve to obtain a desired flow rate of the injection valve which facilitates to obtain a reliable and precise function of the injection valve.
  • the invention is distinguished by a method for determining a set of a valve needle and a valve seat assembly of an injection valve to obtain a desired flow rate of the injection valve.
  • the method comprises the following steps:
  • valve assembly shell comprising a valve body including a central longitudinal axis, the valve body comprising a cavity with a fluid inlet portion and a fluid outlet portion, and a valve seat assembly with a seat plate and a guiding element for guiding the valve needle, the valve needle being 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 the valve needle and the valve seat assembly being designed to enable a fluid flow between the fluid inlet portion and the fluid outlet portion following a first flow path through a gap between the valve needle and the guiding element of the valve seat assembly and a second flow path through the valve seat assembly.
  • the first method comprises the following steps: inserting the valve needle into the cavity of the valve body of the valve assembly shell, coupling the valve assembly shell with a fluid supply, operating the valve needle under a given set of operating conditions, thereby releasing the fluid flow through the fluid outlet portion, preventing a fluid flow through the second flow path and enabling a fluid flow through the first flow path, measuring the fluid flow through the fluid outlet portion under the given set of operating conditions, assigning the valve needle to a flow rate class according to the determined flow rate, and removing the valve needle from the cavity of the valve body of the valve assembly shell.
  • the second method comprises the following steps: coupling the valve seat assembly with the valve sub-assembly, coupling the valve sub-assembly with a fluid supply, operating the valve needle under a given set of operating conditions, thereby releasing the fluid flow through the fluid outlet portion, preventing a fluid flow through the first flow path and enabling a fluid flow through the second flow path, and measuring the fluid flow through the fluid outlet portion under a given set of operating conditions, assigning the valve seat assembly to a flow rate class according to the determined flow rate, and removing the valve seat assembly from the valve sub-assembly.
  • a combination of one of a plurality of valve needles of a flow rate class according to the determined fluid flow of the valve needle and one of a plurality of valve seat assemblies of a flow rate class according to the determined fluid flow of the valve seat assembly is selected to obtain the desired flow rate of the injection valve.
  • valve needles for injection valves are based on a functional test method and a decision based on a geometrical selection of the valve needles can be avoided. Consequently, the number of rejected valve needles can be kept small. Thus, low costs for the injection valve and a small risk of a failure of the injection valve can be obtained.
  • the valve needles can be assigned to flow rate classes according to the determined flow rates. Furthermore, a reliable selection of suitable valve seat assemblies with seat plate, guiding element and fluid flow directing element for injection valves is possible.
  • valve seat assemblies for the injection valves are based on a functional test method and a decision based on a geometrical selection of the seat plate, the guiding element and the fluid flow directing element can be avoided. Consequently, the number of rejected valve seat assemblies can be kept small. Thus, low costs for the injection valve and a small risk of a failure of the injection valve can be obtained.
  • the valve seat assemblies can be assigned to flow rate classes according to the determined flow rates.
  • valve needles and valve seat assemblies of specific flow rate classes can be matched in a desired manner. Consequently, the number of rejected injection valves can be kept small. Thus, low costs for the injection valve and a small risk of a failure of the injection valve can be obtained.
  • An injection valve 62 that is in particular suitable for dosing fuel to an internal combustion engine, comprises an inlet tube 2, a housing 6 and a valve assembly 60.
  • the valve assembly 60 comprises a valve body 4 with a central longitudinal axis L and a cavity 8, which takes in a valve needle 10 and preferably a part of an armature 12.
  • the valve needle 10 has a surface 11 and a seat part 64 ( figure 2 ).
  • a recess 16 is provided which further extends to a recess 18 of the armature 12.
  • a spring 14 is arranged in the recess 16 of the inlet tube 2 and/or the recess 18 of the armature 12. Preferably, it rests on a spring seat being formed by an anti-bounce disc 20. By this the spring 14 is mechanically coupled to the needle 10.
  • An adjusting tube 22 is provided in the recess 16 of the inlet tube 2.
  • the adjusting tube 22 forms a further seat for the spring 14 and may be axially moved during the manufacturing process of the fluid injection valve in order to preload the spring 14 in a desired way.
  • the injection nozzle 24 may be, for example, an injection hole. However, it may also be of some other type suitable for dosing fluid.
  • the seat plate 26 is separate from the valve body 4.
  • a lower guide 28 for guiding the needle 10 is provided.
  • the lower guide 28 further comprises an orifice 70 for guiding the fluid flow.
  • a fluid flow directing element 30 is provided which is arranged in the cavity 8 between the lower guide 28 and the seat plate 26.
  • the fluid flow directing element 30 has the shape of a cylindrical disk.
  • the seat plate 26, the lower guide 28 and the fluid flow directing element 30 are forming a valve seat assembly 32.
  • the injection valve 62 is provided with an actuator unit, that comprises preferably an electromagnetic actuator, comprising a coil 36, which is preferably overmolded.
  • an actuator unit that comprises preferably an electromagnetic actuator, comprising a coil 36, which is preferably overmolded.
  • a valve body shell 38, the armature 12 and the inlet tube 2 are forming an electromagnetic circuit.
  • the actuator unit may, however, also comprise another type of actuator, which is known to a person skilled in the art for that purpose.
  • Such an actuator may be, for example, a piezoelectric actuator.
  • a fluid inlet portion 42 is provided in the valve body 4 which communicates with a fluid outlet portion 44 which is a part of the cavity 8 near the seat plate 26.
  • the fluid is led from the fluid inlet portion 42 to the fluid outlet portion 44.
  • the axial position of the valve needle 10, which determines whether the fluid outlet portion 44 is opened or closed for a fluid flow, depends on the force balance between the spring 14 and the forces applied to the valve needle 10 by the actuator unit with the coil 36.
  • the fluid flows through the fluid outlet portion 44 can be described with flow paths, in particular with a first flow path 66 and a second flow path 68.
  • the fluid flow on the first flow path 66 is following the surface 11 of the valve needle 10.
  • the first flow path 66 enters a gap 72 between the valve needle 10 and the lower guide 28 near the surface 11 of the valve needle 10. This fluid flow is leaving the injection nozzle 24 in axial direction.
  • the second flow path 68 through the orifice 70 of the lower guide 28 represents the fluid flow distanced from the surface 11 of the valve needle 10.
  • the fluid flow on the flow path 68 is passing the fluid flow directing element 30 thereby obtaining a radial velocity component of the fluid flow.
  • the method for determining the capability of the valve needle 10 to control a desired flow rate in the injection valve 62 is carried out in the following manner (see figure 2 ):
  • valve body 4 and the valve seat assembly 32 are forming a valve assembly shell 56 which is used as a measuring device.
  • the valve needle 10 which is to be measured is inserted into the cavity 8 of the valve body 4 of the valve assembly shell 56.
  • the valve assembly shell 56 is coupled with the fluid supply.
  • a fluid flow through the fluid outlet portion 44 is released.
  • the fluid may be a gas or a liquid.
  • the fluid flow through the first flow path 66 is enabled and the fluid flow through the second flow path 68 is prevented by a first fluid flow blocking device 74.
  • the valve assembly shell 56 and the first fluid flow blocking device 74 are forming a one-piece master part.
  • the valve needle 10 is operated under determined operating conditions.
  • the fluid flow through the fluid outlet portion 44 is measured under the determined operating conditions.
  • the valve needle 10 is removed from the cavity 8 of the valve body 4 of the valve assembly shell 56.
  • the method for determining the capability of the valve seat assembly 32 to control a desired flow rate in the injection valve 62 is carried out in the following way (see figure 3 ):
  • valve body 4 and the valve needle 10 are forming a valve sub-assembly 58 which is used as a measuring device.
  • the valve seat assembly 32 which is to be measured is inserted into the valve sub-assembly 58.
  • the valve sub-assembly 58 is coupled with the fluid supply.
  • the fluid flow is released through the fluid outlet portion 44.
  • the fluid may be a gas or a liquid.
  • the fluid flow through the second flow path 68 is enabled and the fluid flow through the first flow path 66 is prevented by a second fluid flow blocking device 76.
  • the valve needle 10 is operated under a certain set of operating conditions.
  • the fluid flow through the fluid outlet portion 44 is determined under the certain set of operating conditions.
  • the valve seat assembly 32 is removed from the valve sub-assembly 58.
  • a combination of the valve needle 10 according to the determined fluid flow of the valve needle 10 and the valve seat assembly 32 according to the determined fluid flow of the valve seat assembly 32 is selected to form a couple of the valve needle 10 and the valve seat assembly 32 to obtain the required flow rate of the injection valve 62.

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  • 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)

Claims (1)

  1. Verfahren zur Bestimmung eines Satzes aus einer Ventilnadel (10) und einer Ventilsitzanordnung (32) eines Einspritzventils (62) zum Erhalt einer Solldurchflussrate des Einspritzventils (62),
    wobei das Verfahren die folgenden Schritte umfasst:
    - Bestimmen eines Fluidstroms der Ventilnadel (10) mit einem mit einem Ventilanordnungsgehäuse (56) durchgeführten ersten Verfahren,
    wobei das Ventilanordnungsgehäuse (56) Folgendes umfasst:
    - einen Ventilkörper (4), der eine mittlere Längsachse (L) enthält, wobei der Ventilkörper (4) einen Hohlraum (8) mit einem Fluideinlassteil (42) und einem Fluidauslassteil (44) umfasst,
    und
    - die Ventilsitzanordnung (32) mit einer Sitzplatte (26) und einem Führungselement (28) zum Führen der Ventilnadel (10), wobei die Ventilnadel (10) in dem Hohlraum (8) axial beweglich ist, wobei die Ventilnadel (10) einen Fluidstrom durch den Fluidauslassteil (44) in einer Schließstellung verhindert und den Fluidstrom durch den Fluidauslassteil (44) in weiteren Stellungen freigibt, und wobei die Ventilnadel (10) und die Ventilsitzanordnung (32) dazu ausgeführt sind, einen Fluidstrom zwischen dem Fluideinlassteil (42) und dem Fluidauslassteil (44), der einem ersten Strömungsweg (66) durch einen Spalt (72) zwischen der Ventilnadel (10) und dem Führungselement (28) der Ventilsitzanordnung (32) und einem zweiten Strömungsweg (68) durch die Ventilsitzanordnung (32) folgt, zu ermöglichen,
    wobei das erste Verfahren die folgenden Schritte umfasst:
    - Einführen der Ventilnadel (10) in den Hohlraum (8) des Ventilkörpers (4) des Ventilanordnungsgehäuses (56),
    - Verbinden des Ventilanordnungsgehäuses (56) mit einer Fluidversorgung,
    - Betätigen der Ventilnadel (10) unter einem gegebenen Satz von Betriebsbedingungen, wodurch der Fluidstrom durch den Fluidauslassteil (44) freigegeben wird, ein Fluidstrom durch den zweiten Strömungsweg (68) verhindert und ein Fluidstrom durch den ersten Strömungsweg (66) ermöglicht wird,
    - Messen des Fluidstroms durch den Fluidauslassteil (44) unter dem gegebenen Satz von Betriebsbedingungen,
    - Zuordnen der Ventilnadel (10) zu einer Durchflussratenklasse gemäß der bestimmten Durchflussrate, und
    - Entfernen der Ventilnadel (10) aus dem Hohlraum (8) des Ventilkörpers (4) des Ventilanordnungsgehäuses (56),
    - Bestimmen eines Fluidstroms der Ventilsitzanordnung (32) mit einem mit einer Ventilunteranordnung (58), die den Ventilkörper (4) und die Ventilnadel (10) umfasst, durchgeführten zweiten Verfahren,
    wobei das zweite Verfahren die folgenden Schritte umfasst:
    - Verbinden der Ventilsitzanordnung (32) mit der Ventilunteranordnung (58),
    - Verbinden der Ventilunteranordnung (58) mit einer Fluidversorgung,
    - Betätigen der Ventilnadel (10) unter einem gegebenen Satz von Betriebsbedingungen, wodurch der Fluidstrom durch den Fluidauslassteil (44) freigegeben wird, ein Fluidstrom durch den ersten Strömungsweg (66) verhindert und ein Fluidstrom durch den zweiten Strömungsweg (68) ermöglicht wird,
    und
    - Messen des Fluidstroms durch den Fluidauslassteil (44) unter einem gegebenen Satz von Betriebsbedingungen,
    - Zuordnen der Ventilsitzanordnung (32) zu einer Durchflussratenklasse gemäß der bestimmten Durchflussrate, und
    - Entfernen der Ventilsitzanordnung (32) von der Ventilunteranordnung (58),
    - Wählen einer Kombination von einer mehrerer Ventilnadeln (10) einer Durchflussratenklasse gemäß dem bestimmten Fluidstrom der Ventilnadel (10) und einer mehrerer Ventilsitzanordnungen (32) einer Durchflussratenklasse gemäß dem bestimmten Fluidstrom der Ventilsitzanordnung (32) zum Erhalt der Solldurchflussrate des Einspritzventils (62).
EP20070015380 2007-08-06 2007-08-06 Verfahren zur Bestimmung der Zusammenstellung einer Ventilnadel und einer Ventilsitzanordnung eines Einspritzventils Active EP2025923B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20070015380 EP2025923B1 (de) 2007-08-06 2007-08-06 Verfahren zur Bestimmung der Zusammenstellung einer Ventilnadel und einer Ventilsitzanordnung eines Einspritzventils
DE200760013891 DE602007013891D1 (de) 2007-08-06 2007-08-06 Verfahren zur Bestimmung der Zusammenstellung einer Ventilnadel und einer Ventilsitzanordnung eines Einspritzventils

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20070015380 EP2025923B1 (de) 2007-08-06 2007-08-06 Verfahren zur Bestimmung der Zusammenstellung einer Ventilnadel und einer Ventilsitzanordnung eines Einspritzventils

Publications (2)

Publication Number Publication Date
EP2025923A1 EP2025923A1 (de) 2009-02-18
EP2025923B1 true EP2025923B1 (de) 2011-04-13

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Application Number Title Priority Date Filing Date
EP20070015380 Active EP2025923B1 (de) 2007-08-06 2007-08-06 Verfahren zur Bestimmung der Zusammenstellung einer Ventilnadel und einer Ventilsitzanordnung eines Einspritzventils

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DE (1) DE602007013891D1 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6179227B1 (en) * 1997-02-06 2001-01-30 Siemens Automotive Corporation Pressure swirl generator for a fuel injector
DE10052143A1 (de) * 2000-10-20 2002-05-08 Bosch Gmbh Robert Brennstoffeinspritzventil
EP1811166B1 (de) * 2006-01-24 2008-11-05 Continental Automotive GmbH Ventilanordnung für ein Einspritzventil und Einspritzventil

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Publication number Publication date
DE602007013891D1 (de) 2011-05-26
EP2025923A1 (de) 2009-02-18

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