WO2008046819A2 - Procédé de réglage de la course à vide d'un actionneur d'une soupape doseuse - Google Patents

Procédé de réglage de la course à vide d'un actionneur d'une soupape doseuse Download PDF

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Publication number
WO2008046819A2
WO2008046819A2 PCT/EP2007/061010 EP2007061010W WO2008046819A2 WO 2008046819 A2 WO2008046819 A2 WO 2008046819A2 EP 2007061010 W EP2007061010 W EP 2007061010W WO 2008046819 A2 WO2008046819 A2 WO 2008046819A2
Authority
WO
WIPO (PCT)
Prior art keywords
actuator
spacer
metering valve
valve
injector
Prior art date
Application number
PCT/EP2007/061010
Other languages
German (de)
English (en)
Other versions
WO2008046819A3 (fr
Inventor
Rene Böhm
Udo Kreissig
Peter Voigt
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 DE112007002485T priority Critical patent/DE112007002485A5/de
Publication of WO2008046819A2 publication Critical patent/WO2008046819A2/fr
Publication of WO2008046819A3 publication Critical patent/WO2008046819A3/fr

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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
    • 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D41/2096—Output circuits, e.g. for controlling currents in command coils for controlling piezoelectric injectors
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M61/161—Means for adjusting injection-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
    • 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 a method for individually setting a Leerhubs an actuator, preferably a piezoelectric actuator, in a metering valve, in particular in a fuel injector. Furthermore, the invention relates to a correspondingly produced metering valve, in particular a suitably produced fuel injector, such. As a common rail fuel injector or a pump-nozzle fuel injector.
  • An injector generally has an injection valve which is hydraulically opened and closed by a servo valve (common rail injector) or by a control valve (pump nozzle injector) in order to precisely define a time profile of an injection process into the combustion chamber ,
  • the servo or control valve is actuated by an electrically actuated actuator, with the use of piezoelectric actuators having proven particularly advantageous for achieving sufficiently short switching times.
  • a longitudinal expansion is caused by applying an electrical voltage, which is transmitted to the servo or control valve, which in turn opens or closes the injection valve. So that lying in the micron range longitudinal expansion of the piezoelectric actuator, the servo or The control valve can actuate the longitudinal expansion is generally amplified either mechanically by a leverage mounted in the fuel or hydraulically via a pressure chamber.
  • each Kopfbau ⁇ group pieoelectric actuator, injector body, control valve member and Hebelpac
  • a closing start voltage of the control valve and by means of a control chart a target value for adapted to an idle stroke in an assembly formula.
  • a disadvantage of the known method is that they require a double mounting of the head assembly or of each injector.
  • piezo actuators have the disadvantage that the same piezo actuators do not behave the same at the same drive voltage, ie have a different stroke. This is expressed by the so-called Uio value, which indicates a necessary electrical drive voltage Uio at an elongation of the piezoelectric actuator of 10 ⁇ m.
  • Ui 0 value which is individual for the respective piezoactuator
  • Ui 0 value which is individual for the respective piezoactuator
  • an individual stroke is assumed for the respective injector.
  • D. h. In an unfavorable combination of injectors in an injection system is in concern z.
  • the object of the invention is achieved by a method for individually setting an idle stroke of an actuator in a metering valve, in particular for individually setting an idle stroke of a piezoelectric actuator in a fuel injector.
  • a method for individually setting an idle stroke of an actuator in a metering valve in particular for individually setting an idle stroke of a piezoelectric actuator in a fuel injector.
  • a fast actuator has to cover a larger Leerhubweg within the metering valve, as a slow actuator.
  • the corresponding idle strokes of the actuators are matched to one another in such a way that, given an identical drive voltage, they have traveled the entire idle stroke within the metering valve in the same time.
  • this also applies to other Anêttressen, so z. B. certain events in the metering valve for each metering valve at the same drive voltage to the same degree can be controlled.
  • this, particularly for direct-driven projectors In ⁇ be a specific event in a nozzle section of the metering valve.
  • this event z. B. be characterized by a certain stroke of the nozzle needle.
  • a fast actuator is characterized in that it has a comparatively large stroke even with a small drive voltage, whereas a slow actuator only reaches this stroke with a larger drive voltage.
  • the driving control reference voltage different actuators exhibit a different stroke behavior;
  • this drive reference voltage exists through the Uio value known there.
  • This Uio value characterizes the electrical voltage which is to be applied to the piezoactuator so that it lengthens by 10 ⁇ m.
  • the drive reference voltage for other strokes, for example 5 ⁇ m or 20 ⁇ m.
  • the method for individually adjusting the idle stroke of the actuator in the metering valve in two steps wherein the first step, z. B. takes place in piezoelectric actuators at a supplier who measures the drive reference voltage for each delivered actuator, ie the üio value indicates.
  • this first step can be omitted since the drive reference voltage is already known to the purchaser of the piezo actuator.
  • the drive reference voltage is taken into account accordingly, wherein an actuator with a small drive reference voltage can execute a comparatively large idle stroke in the metering valve, and an actuator with a large drive reference voltage has a small idle stroke.
  • the individual Leerhubeingnagnagna herein takes place by means of a spacer or a spacer instead, which is dimensioned accordingly, which is so tuned in its thickness that it realizes a large idle stroke of the actuator at a comparatively fast actuator, whereas in a comparatively slow actuator one realized comparatively short idle stroke of the actuator.
  • a relevant thickness of the spacer or the spacer is comparatively large and in a slow actuator, the relevant thickness of the spacer or the spacer is comparatively small.
  • the spacer in the following, only spacers are mentioned, but the term spacer is intended to be encompassed by the latter) thus serves according to the invention to compensate for dimensional tolerances and electrical properties of the (piezo) actuator.
  • the relevant thickness of the spacer is determined based on the geometric conditions in an installation space for a bottom plate of the actuator, this value is changed by a compensation value, which takes into account a fast or a slow actuator.
  • the compensation value is formed on the basis of a drive voltage, in particular based on the drive reference voltage.
  • the drive reference voltage that voltage at which the actuator has a certain stroke.
  • the so-called Ui O value in which each piezoelectric actuator has a drive voltage characterizing it, which is different for different piezo actuators.
  • this method can also be reversed, wherein the drive reference voltage is held and a corresponding elongation of the actuator is determined.
  • the individual drive reference voltage for each actuator now enters the compensation value such that a relevant thickness of the spacer is smaller for an actuator with a high drive reference voltage (slow actuator) compared to an actuator with a lower drive reference voltage.
  • the reverse is with an actuator with a low drive reference voltage (fast actuator)
  • the influence of the drive reference voltage in particular the influence of the i O value in piezo actuators, is corrected to the idle stroke of a metering valve. Ie.
  • the influence of the drive reference voltage in the case of fuel injectors, scattering of the built-in idle strokes is reduced and thus quantity spreads at a test point of the injector are minimized, which leads to an increased output of the injectors.
  • the drive reference voltage is weighted in the compensation value with respect to a drive reference operating voltage, wherein a quotient of these two is preferably included in the compensation value.
  • spring forces such as an actuator stiffness, a current spring constant of a closing spring of a valve member, a deformation of an actuator housing and / or a tube spring, in which a piezoelectric stack of the actuator is installed, are taken into account.
  • a nominal idle stroke of the valve member of the control or servo valve is taken into account in the compensation value.
  • the inventive method is generally applicable to Dosierventi- Ie or injectors or assemblies of injectors.
  • the metering valve is a pump-nozzle fuel injector whose piezo actuator actuates and controls a control valve.
  • the actuator is supported with a bottom plate preferably via at least one lever disc on the spacer.
  • a lever thickness of the mechanical leverage is in the relevant thickness of the spacer with a.
  • the metering valve is a common rail fuel injector whose bottom plate with an extension controls a control chamber of the injector via a servo valve.
  • the actuator itself is supported on the spacer on the injector body, wherein the spacer can be arranged on sides of the bottom plate or on one of these opposite side of the actuator.
  • the metering valve is a directly driven fuel injector, the bottom plate of the actuator acting directly or by means of a translation on a nozzle needle of the injector.
  • the actuator is preferably controlled inversely.
  • Fig. 1 is a side view of a common rail injector
  • Fig. 2 shows a mounted head assembly of a pump-nozzle injector in a partially sectioned plan view
  • FIG. 3 shows linearized piezocurrencies of a single piezoelectric actuator in a mounted and in a non-mounted state of the piezoelectric actuator
  • FIG. 4 shows linearized piezo characteristics of two piezo actuators in the mounted state
  • Fig. 5 is a schematic sectional view of a portion of a common rail injector according to the invention.
  • the invention is applicable. Moreover, it is possible to apply the method according to the invention to a head assembly of an injector.
  • This head assembly is later part of an injector, the term injector is to include the term head assembly; d. h., If in the following of an injector is mentioned, it should apply analogously to a head assembly. If, in the following, a voltage is mentioned, this means an electrical voltage.
  • an injector 1 essentially comprises a foot assembly 2 and a head assembly 3.
  • the foot assembly 2 essentially has an injection valve 20 with an injection nozzle 22.
  • a nozzle needle (not shown in the drawing) is guided up and down movable, wherein depending on a position of the nozzle needle from the injection nozzle 22, a fluid can escape controlled.
  • the injector 1 shown in FIG. 1 is a common rail
  • Fuel injector 1 the head assembly 3 has a Dosierventil- or injector body 10, in which an actuator 30th (see Fig. 5) is arranged.
  • This actuator 30 is preferably designed as a piezoelectric actuator 30.
  • the head assembly 3 shown in FIG. 1 shows an electrical connection for the actuator 30 (actuator connection 14) and a high-pressure inlet 12 for the injector 1.
  • the high-pressure inlet 12 supplies the injector 1 with fuel under high pressure from a common rail ,
  • the injector 1 is designed as a pump-nozzle fuel injector.
  • Head assembly 3 of such an injector 1 is shown in Fig. 2 partially cut.
  • the injector 1 according to the second embodiment of the invention differs substantially from one of the first embodiment in that the head assembly 3 is designed differently.
  • the pressurized fuel is not supplied to the injector 1, but is generated by a pump piston within the injector 1, the pump piston being driven by an injection cam of a camshaft.
  • Injectors 1 apply.
  • the actuator 30 does not act on a control valve 40, as shown in FIG. 2, but on a servo valve 50 (see below), as shown in FIG.
  • FIG. 2 shows the pump-nozzle injector 1 cut centrally in the region of its head assembly 3, the section passing along a center line of a valve member 42 of the control valve 40 and along the center line of the actuator 30.
  • the actuator 30 has internally in its actuator housing 34 a built-in a tube spring 35 piezo stack 31 which terminates in a bottom plate 32 of the actuator 30.
  • the bottom plate 32 looks out with an extension of the actuator 30, wherein the bottom plate 32 is held by a spring 33 in the actuator housing 34.
  • the actuator housing 34 is preferably by means of a steel ring 38, which is arranged in a circumferential groove in the actuator housing 34 and protrudes partially out of this, screwed by means of a union nut 39 on the injector body 10.
  • the actuator housing 34 is supported on a projection in a stepped bore in the injector body 10.
  • a mechanical lever transmission 60 which is preferably formed with two lever discs 62, 64.
  • the bottom plate 32 rests against the lever disk 62, which in turn can actuate the lever disk 64.
  • the lever disk 64 in turn acts on a valve member 42 of the control valve 40.
  • this has a return spring 44, which is preferably held by a nut in the injector body 10.
  • the lever plate 62 is held in position by a spring 63. Furthermore, the lever plate 64 is also held by a spacer 70 dimensioned according to the invention. For this purpose, both the spring 63 and the spacer 70 are provided with a corresponding slot or a recess in which the respective lever plate 62, 64 is arranged substantially positive fit with sufficient clearance.
  • E is the thickness of a lever support, ie the thickness of the lever plate 62 and a master part; K is an empirically determined constant (here: 1.69); A is the height of an installation space, ie the distance between the installed actuator housing 34 and the support of the spacer 70 in the injector body 10; C is a Aktorschreibstand, so that distance by which the bottom plate 32 from the respective longitudinal end of the actuator housing 34 protrudes or in; D is a thickness of the entire lever package, in this case a thickness of the mechanical leverage 60; F represents a deformation of the actuator housing for the operating point actuator 30 elongated by the idle stroke h L ; and h L , so n a Sollleerhub the actuator 30 in the injector 1.
  • the required thickness X of the spacer 70 is calculated and the idle stroke h L adjusted by a corresponding spacer 70 with this thickness.
  • formula 1 it is possible to modify formula 1 with other terms, such as. B. a Ventilgliedunterstand L of the control valve member 42 in the actuator body 10. If you perform this method to any accuracy, so the idle stroke h L can be set as arbitrarily accurate.
  • the Sollleerhub hi so n of the piezoelectric actuator 30 in the injector 1 2 ⁇ m to 3 ⁇ m
  • injectors 1 - in particular equipped with piezo actuators 30 - having identical Leerhübe h L show no identical injection behavior. This is because with the same drive voltage U, the piezo actuators 30 have a different expansion behavior. Ie. there are piezoactuators 30 which lengthen more than other piezoactuators 30 when a specific electrical potential is applied.
  • This Ui O value is different for each piezoelectric actuator 30.
  • FIG. 4 represents two linearized piezocurrents I, II of two piezoactuators 30.
  • the characteristic I shows a piezoelectric actuator 30 with a small Uio value
  • ie characteristic I represents a fast piezoelectric actuator 30, in which a smaller potential difference is required for a certain deflection, as for a piezoelectric actuator 30 with a large Uio value.
  • a characteristic curve II represents a slow piezoactuator 30 with a large Uio value. That is to say, its drive reference voltage Ui 0 is higher than that of a fast piezoactuator 30.
  • a method which corrects the influence of different Uio values on the injection behavior.
  • a respective idle stroke h L is set individually in the injector 1, so that a plurality of injectors 1 in an injection system have as identical an injection behavior as possible at one and the same drive voltage U.
  • piezoelectric actuators 30 with a comparatively small Uio value greater idle stroke h L have in the injector 1, as piezoelectric actuators 30 with a comparatively large Uio value. According to the invention this is taken into account by a compensation value or term .DELTA.X in the formula 1:
  • This drive reference operating voltage U RB may be an operating voltage U of the piezoelectric actuator 30 at any event within the injector 1.
  • the drive reference operating voltage U RB ZB may be a closing start voltage U R B of the control valve 40 or an opening start voltage U RB of a servo valve 50 (see FIG.
  • the drive reference operating voltage U RB may be a specific stroke h of a valve member 42, 52 of the control 40 or servo valve 50 (see Fig. 5).
  • the drive reference operating voltage U RB z. B indicates a placement of the nozzle needle on or a lift off of its nozzle needle seat. Furthermore, it is possible to assign a certain stroke h of the nozzle needle to a drive reference operating voltage U 1.
  • Fig. 3 shows two piezo characteristics I, II one and the same piezoelectric actuator 30 in the uninstalled (characteristic I) and in the installed (characteristic II) state.
  • a deflection of the piezoelectric actuator 30 is indicated in the diagram of FIG. 3 on the abscissa, whereas the piezoantrol voltage U is plotted on the ordinate.
  • the linearized characteristic I now shows an expansion of the piezoelectric actuator 30 in an unloaded state, with the piezoelectric actuator 30 elongated by a lO ⁇ m with a continuous increase of the electrical drive voltage U.
  • the drive reference voltage Uio (Uio value) can then be read off. This measurement is preferably after the production of the piezoelectric actuator 30, z. B. at a supplier instead, which mitellet the Uio value in the delivery of the piezoelectric actuator 30.
  • FIG. 3 shows a characteristic II of the same piezoactuator 30 as it will behave in a state built into an injector 1 under certain conditions. These conditions are a desired idle stroke h L , in the present case 2 to 3 microns, but this may also vary, and the event lO ⁇ m stroke of the valve member 42, 52.
  • the event lO ⁇ m stroke of the valve member 42, 52 can be varied as described above ,
  • the electrical drive reference operating voltage U RB read at 10 ⁇ m stroke of the valve member 42, 52 corresponds by definition to a closing start voltage of the control valve 40.
  • the idle stroke h L required for the particular injector 1 can be calculated. This is done by a geometric analysis of the two characteristics I and II:
  • the thickness of the spacer 70 is as follows:
  • Fig. 5 shows the position of the spacer 70 in another embodiment of the invention.
  • 5 shows a detail of a common rail injector 1, the piezoelectric actuator 30 of which can open and close a servo valve 50.
  • the spacer 70 is located on the bottom plate 32 opposite side of the injector 1 between the injector body 10 and piezoelectric actuator 30.
  • a determination of a thickness X of the spacer 70 according to the invention takes place analogously to the above statements.

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

Abstract

L'invention concerne un procédé de réglage de la course à vide (hL) d'un actionneur (30), de préférence d'un actionneur piézo-électrique (30), dans une soupape doseuse (1), en particulier dans un injecteur de carburant ou un bloc de tête (3) d'un injecteur de carburant (1), procédé caractérisé en ce qu'au moyen d'une tension de référence de commande (U10) requise pour une course de référence prédéterminée (h10) de l'actionneur (30), une course à vide (hL) de l'actionneur (30) dans la soupape doseuse (1) est réglée de telle façon que la course à vide (hL) soit choisie d'autant plus grande que la tension de référence de commande (U10) est plus faible.
PCT/EP2007/061010 2006-10-20 2007-10-16 Procédé de réglage de la course à vide d'un actionneur d'une soupape doseuse WO2008046819A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112007002485T DE112007002485A5 (de) 2006-10-20 2007-10-16 Verfahren zur individuellen Leerhubeinstellung eines Aktors eines Dosierventils

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006049564 2006-10-20
DE102006049564.0 2006-10-20

Publications (2)

Publication Number Publication Date
WO2008046819A2 true WO2008046819A2 (fr) 2008-04-24
WO2008046819A3 WO2008046819A3 (fr) 2008-07-17

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PCT/EP2007/061010 WO2008046819A2 (fr) 2006-10-20 2007-10-16 Procédé de réglage de la course à vide d'un actionneur d'une soupape doseuse

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DE (1) DE112007002485A5 (fr)
WO (1) WO2008046819A2 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10340975A1 (de) * 2003-09-05 2005-03-31 Robert Bosch Gmbh Verfahren für die Steuerung eines Stellglieds
WO2005108774A1 (fr) * 2004-05-10 2005-11-17 Siemens Aktiengesellschaft Injecteur de carburant a ajustage rectifiable d'une course a vide d'une unite d'actionneur
DE102005040534A1 (de) * 2005-08-26 2007-03-01 Siemens Ag Ventil, Verfahren zum Herstellen des Ventils und Verfahren zum Einrichten einer Steuereinheit vor einer Erstinbetriebnahme des Ventils für ein Anstuern des Ventils

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10340975A1 (de) * 2003-09-05 2005-03-31 Robert Bosch Gmbh Verfahren für die Steuerung eines Stellglieds
WO2005108774A1 (fr) * 2004-05-10 2005-11-17 Siemens Aktiengesellschaft Injecteur de carburant a ajustage rectifiable d'une course a vide d'une unite d'actionneur
DE102005040534A1 (de) * 2005-08-26 2007-03-01 Siemens Ag Ventil, Verfahren zum Herstellen des Ventils und Verfahren zum Einrichten einer Steuereinheit vor einer Erstinbetriebnahme des Ventils für ein Anstuern des Ventils

Also Published As

Publication number Publication date
DE112007002485A5 (de) 2009-09-17
WO2008046819A3 (fr) 2008-07-17

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