EP1743097A1 - Procede de production d'un injecteur - Google Patents

Procede de production d'un injecteur

Info

Publication number
EP1743097A1
EP1743097A1 EP05716810A EP05716810A EP1743097A1 EP 1743097 A1 EP1743097 A1 EP 1743097A1 EP 05716810 A EP05716810 A EP 05716810A EP 05716810 A EP05716810 A EP 05716810A EP 1743097 A1 EP1743097 A1 EP 1743097A1
Authority
EP
European Patent Office
Prior art keywords
assembly
determined
stroke
parameter
predetermined
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.)
Granted
Application number
EP05716810A
Other languages
German (de)
English (en)
Other versions
EP1743097B1 (fr
Inventor
Willibald SCHÜRZ
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.)
VDO Automotive AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP1743097A1 publication Critical patent/EP1743097A1/fr
Application granted granted Critical
Publication of EP1743097B1 publication Critical patent/EP1743097B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49405—Valve or choke making

Definitions

  • the invention relates to a method for producing an injector, which is particularly suitable for metering fuel into a combustion chamber of a cylinder of an internal combustion engine.
  • An injector regularly comprises an injector housing and a stroke actuator, which is designed, for example, as a piezo actuator, furthermore a nozzle clamping nut, a nozzle body and a nozzle needle, which is guided in a recess in the nozzle body and releases or closes an injection nozzle depending on its position. Furthermore, a reset means is regularly provided, which biases the nozzle needle into its closed position.
  • the object of the invention is to provide a method for producing an injector which enables the injector to be controlled precisely in a simple manner.
  • the object is achieved by the features of the independent claim.
  • Advantageous embodiments of the invention are characterized in the subclaims.
  • the invention is characterized by a method for producing an injector, in which a first assembly comprising an injector housing and a stroke actuator is installed, and a second assembly comprising a valve body, a nozzle needle and a reset means for the nozzle needle.
  • at least one value of at least one parameter for the first assembly is determined by suitably actuating the actuator.
  • the first assembly is assigned to one of several classes.
  • At least one value of at least one parameter for the second assembly is determined by suitable actuation of the nozzle needle.
  • the second assembly is assigned to one of the several classes.
  • a first assembly is paired and assembled with a second assembly of the same class.
  • Adjustment of the injector can thus be dispensed with, if necessary, and adjustment parts which are otherwise necessary for this can be dispensed with. Furthermore, a low reject rate in the manufacture of the injectors can be ensured in a simple manner. Furthermore, during the determination of the parameters, the first assembly is not exposed to a test fluid to which the second assembly is generally exposed during the determination of the at least one value of its at least one parameter. Such a test fluid has the disadvantage that it may damage the stroke actuator if it is not yet hermetically sealed in the injector housing. This is particularly critical with regard to a stroke actuator designed as a piezo actuator, which is encapsulated with a silicone potting compound which, when in contact with a test fluid, e.g. Fuel may swell.
  • a test fluid e.g. Fuel may swell.
  • a predetermined stroke of the stroke actuator under the action of a predetermined counterforce is in the first assembly adjusted to the stroke actuator and as a parameter a variable is determined which is characteristic of the electrical energy to be supplied to the stroke actuator.
  • the size, which is characteristic of the electrical energy to be supplied to the lifting actuator characterizes the individual control behavior of the first assembly very well and is easy to detect or determine.
  • a predetermined stroke of the stroke actuator is set with the supply of a predetermined electrical energy in the first assembly and the counterforce required on the stroke actuator is determined as a parameter.
  • This counterforce required on the stroke actuator also characterizes the individual control behavior of the first module very well.
  • At least one predetermined stroke of the nozzle needle is set in the second assembly with the supply of test fluid to the second assembly, and an ice-cold parameter is determined depending on the force to be applied to the nozzle needle that is necessary for this purpose.
  • the necessary force to be exerted on the nozzle needle characterizes the individual stiffness of the restoring means of the second assembly very well.
  • the at least one predetermined stroke of the nozzle needle is set in the second assembly, and a second parameter is determined as a function of the then occurring flow of fluid through an injection nozzle of the valve body while supplying test fluid under a predetermined pressure.
  • the resulting flow characterizes the individual geometry of the second assembly very well. Furthermore, the setting of the predetermined stroke of the nozzle needle and the feeding of test fluid can easily be carried out under the specified pressure.
  • At least one predetermined stroke of the nozzle needle is set in the second assembly and a predetermined flow of the test fluid through the injection nozzle of the nozzle body is set, and a third parameter is determined depending on the pressure of the test fluid required for this.
  • the pressure of the test fluid required for this characterizes the individual geometry of the second assembly very well.
  • FIG. 1 shows a first and a second assembly of an injector during the determination of at least one parameter each for division into a class
  • FIG. 2 shows the finished injector
  • FIG. 3 shows a flow chart of a program for determining a class of the first assembly
  • Figure 4 shows a first embodiment of a program for determining the class of the second assembly
  • Figure 5 shows a program of a second embodiment for determining the class of the second assembly.
  • FIG. 1 shows a first assembly 1 and a second assembly 2 of an injector during the manufacture of the injector, specifically when determining parameters for classifying the first and second assemblies.
  • the first assembly 1 comprises an injector housing 4 which has a recess which extends in the axial direction and in which a bearing 6 is preferably pressed. Axially thereafter, a hydraulic compensating element 8 is arranged and then a stroke actuator designed as a piezo actuator 10. Furthermore, a high-pressure bore 12 is provided, which is provided to lead fuel from a fuel connection, not shown, to an injection nozzle 22 of the injector.
  • the second assembly comprises a nozzle clamping nut 14, into which a nozzle body is inserted.
  • the nozzle body 16 has a recess into which a nozzle needle 18 is inserted.
  • a restoring means 20 is provided, which is preferably designed as a spring, which prestresses the nozzle needle 18 into a closed position, in which it prevents the fuel flow through the injection nozzle 22.
  • a transmitter element 24 is preferably provided, which is designed to transmit the stroke of the piezo actuator 10. Alternatively, the transmitter element 24 can also be arranged in the first structural unit or not at all.
  • a first unit 26 is provided, which is connected to the piezo actuator 10 in an electrically conductive manner and via which a predeterminable electrical energy can be supplied to the piezo actuator 10.
  • a second unit 28 is provided, via which a counterforce against the piezo actuator 10 can be set or can also be determined.
  • a fourth unit 32 is provided, by means of which a nozzle needle stroke of the nozzle needle 18 can be set or can also be determined.
  • a third unit 30 is provided, by means of which a test fluid can be applied to the second assembly 2, the third unit being designed for setting a predetermined pressure of the test fluid or for determining the pressure of the test fluid.
  • a fifth unit 34 is provided, which collects the test fluid emerging from the injection nozzle 22 and thus determines the flow of the test fluid through the injection nozzle needle.
  • an evaluation unit 36 is provided which is designed to assign the first and second assemblies 1, 2 to a class CL of several classes CL.
  • a class CL of several classes CL For example, three classes CL can be provided, but a different number of classes CL can also be provided.
  • the classes CL are selected so that injectors, which are composed of a first assembly and a second assembly of the same class, correspond very well to a predetermined control behavior and thus ensure precise metering of fuel.
  • a program for determining the class CL of the first assembly 1 is started in a step S1 (FIG. 3).
  • a predetermined egg stroke AH__G of the piezo actuator is set under the action of a predetermined counterforce AF_G on the piezo actuator 10. This is done by means of the first and second units 26, 28.
  • the predetermined stroke AH_G can be 40 ⁇ m, for example.
  • the predetermined counterforce AF_G can be, for example, 100 N based on the state of the piezo actuator 10 in which it is not deflected.
  • a step S3 the electrical energy E_V is then determined, which was required to set the predetermined stroke AH_G with the counterforce AF_G acting simultaneously on the piezo actuator 10. Steps S2 and S3 can also be carried out several times and a corresponding average value of the required electrical energy E_V can be determined.
  • the first assembly 1 is then assigned a class CL depending on the required energy E_V determined in step S3. For example, three classes are provided, so that depending on the respective value of the required electrical energy E_V, either the first, the second or the third class is assigned in step S5.
  • the program is then ended in a step S7.
  • a predetermined electrical energy can also be supplied to the first assembly 1 and the predetermined stroke AH_G can be set and then it can be determined what value the counterforce required for this on the stroke actuator must be.
  • the class of the first assembly 1 is then also determined depending on the counterforce required.
  • a program (FIG. 4) for determining the class CL of the second module 2 is started in a step S9.
  • a predetermined pressure of the test fluid and a first predetermined stroke DH_G1 of the nozzle needle 18 in the second assembly 2 are set by the t: third unit 30.
  • the necessary first force F_V1 and the first flow FL_V1 of test fluid through the injection nozzle 22 which is necessary for this purpose is then determined.
  • the necessary first force F_V1 is determined in the fourth unit 32.
  • the first flow FL_V1 of the test fluid is determined in the fifth unit 34.
  • steps S11 and S13 can be repeated several times and corresponding average values can be determined in this way.
  • step S15 the class CL of the second assembly is then determined depending on the necessary first force F_V1 and the first flow FL_V1 of the test fluid. Alternatively, the determination of the class can only depend on the necessary first force F VI or alternatively the first Flow FL_V1 take place.
  • the program is then ended in a step S17.
  • a step S19 is preferably also provided, in which a second predetermined stroke DH_G2 of the nozzle needle 18 is then set and a corresponding second necessary force F_V2 and a corresponding second flow FL_V1 of the test fluid are detected or ascertained and, if appropriate, also a third predetermined stroke DH_G3 the nozzle needle 18 is set and then a corresponding third necessary force F__V3 and a corresponding third flow FL_V3 of test fluid is determined.
  • Class CL of the second assembly is then determined in a step S21 depending on the necessary first to third forces F_V1 to F__V3 and / or the first to third flows FL_V1 to FL_V3 of the test fluid.
  • FIG. 5 shows a second embodiment of the program for determining the class CL of the second module 2.
  • the program is started in a step S25 and in a step S27 a first predetermined stroke DH_G1 of the nozzle needle 18 and one predetermined first flow FL_G1 of test fluid through the injection nozzle 22 is set.
  • a subsequent step S29 the necessary first force F_V1 and the first pressure required for this is then determined P__V1 or detected specifically in the fourth unit 32 and in the third unit 30.
  • the "Steps S27 and S29 again several times in succession are carried out and corresponding mean values are determined in step S29.
  • a class CL is then assigned to the second assembly 2 in a step S31, depending on the necessary first force F_V1 and / or the necessary first pressure P_V1.
  • the program is then ended in a step S31.
  • the predetermined second stroke DH G2 of the nozzle needle is preferably also performed in a step S35 18 and then the correspondingly required second force F_V2 and a correspondingly necessary second pressure P_V2 are determined.
  • the third predetermined stroke DH_G3 of the nozzle needle 18 is then preferably also set, and the third force F_V3 required for this is detected or ascertained and the pressure P_V3 required for this is detected or ascertained.
  • the class CL is determined depending on the necessary first to third force F_V1 to F_V3 and / or the first to third pressure P_V1 to P_V3 required for this.
  • first and second assemblies 1, 2 of the same class CL are then paired, namely program-controlled and, for example, assembled to one another by program-controlled screwing of the nozzle clamping nut.

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)

Abstract

Selon l'invention, un premier bloc de composants (1) comprenant une cage d'injecteur (4) et un mécanisme de levage et d'ajustement, est monté. Un second bloc de composants (2), qui comprend un corps d'ajutage (16), une aiguille d'injection (18) et un élément de rappel, est monté. Au moins une valeur d'au moins une grandeur caractéristique du premier bloc de composants est déterminée par régulation appropriée du mécanisme de levage et d'ajustage. En fonction de cette valeur (au moins au nombre de une) de ladite grandeur caractéristique (au moins au nombre de une) le premier groupe de composants (2) est alloué à une parmi plusieurs catégories (CL). Au moins une valeur d'au moins une valeur caractéristique du second bloc de composants (2) est déterminée par actionnement approprié de l'aiguille d'injection (18). En fonction de la valeur (au moins au nombre de une) de la grandeur caractéristique (au moins au nombre de une), le second bloc de composants (2) est alloué à une parmi plusieurs catégories. Dans chaque cas, un premier bloc de composants (1) et un second bloc de composants (2) de la même catégorie sont appairés et montés.
EP05716810A 2004-05-03 2005-02-25 Procede de production d'un injecteur Expired - Fee Related EP1743097B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004021652A DE102004021652A1 (de) 2004-05-03 2004-05-03 Verfahren zum Herstellen eines Injektors
PCT/EP2005/050819 WO2005108772A1 (fr) 2004-05-03 2005-02-25 Procede de production d'un injecteur

Publications (2)

Publication Number Publication Date
EP1743097A1 true EP1743097A1 (fr) 2007-01-17
EP1743097B1 EP1743097B1 (fr) 2007-08-08

Family

ID=34961616

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05716810A Expired - Fee Related EP1743097B1 (fr) 2004-05-03 2005-02-25 Procede de production d'un injecteur

Country Status (5)

Country Link
US (1) US7478626B2 (fr)
EP (1) EP1743097B1 (fr)
JP (1) JP4461174B2 (fr)
DE (2) DE102004021652A1 (fr)
WO (1) WO2005108772A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT510462B1 (de) * 2010-09-22 2014-04-15 Bosch Gmbh Robert Verfahren zum überprüfen und instandsetzen eines kraftstoffinjektors
DE102013212330A1 (de) * 2013-06-26 2014-12-31 Continental Automotive Gmbh Verfahren zum Herstellen von Injektoren, insbesondere Kraftstoffinjektoren, sowie Injektor

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3834445A1 (de) * 1988-10-10 1990-04-12 Mesenich Gerhard Elektromagnetisches einspritzventil mit kippanker
US5155461A (en) * 1991-02-08 1992-10-13 Diesel Technology Corporation Solenoid stator assembly for electronically actuated fuel injectors and method of manufacturing same
DE19534445C2 (de) * 1995-09-16 1998-07-30 Man Nutzfahrzeuge Ag Einspritzventil für Brennkraftmaschinen
US20010002680A1 (en) * 1999-01-19 2001-06-07 Philip A. Kummer Modular two part fuel injector
DE19939450A1 (de) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
US6676043B2 (en) * 2001-03-30 2004-01-13 Siemens Automotive Corporation Methods of setting armature lift in a modular fuel injector
US6904668B2 (en) * 2001-03-30 2005-06-14 Siemens Vdo Automotive Corp. Method of manufacturing a modular fuel injector
US6687997B2 (en) * 2001-03-30 2004-02-10 Siemens Automotive Corporation Method of fabricating and testing a modular fuel injector
JP4120590B2 (ja) * 2003-03-05 2008-07-16 株式会社デンソー インジェクタの部品組付方法
EP1493917B1 (fr) * 2003-05-30 2006-04-12 Siemens VDO Automotive S.p.A. Assemblage d'un injecteur

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005108772A1 *

Also Published As

Publication number Publication date
JP4461174B2 (ja) 2010-05-12
US7478626B2 (en) 2009-01-20
JP2007535642A (ja) 2007-12-06
US20080011885A1 (en) 2008-01-17
DE102004021652A1 (de) 2005-12-01
WO2005108772A1 (fr) 2005-11-17
EP1743097B1 (fr) 2007-08-08
DE502005001195D1 (de) 2007-09-20

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