EP1144841A2 - Method for positioning the actuating drive in a fuel injector and device for implementing said method - Google Patents
Method for positioning the actuating drive in a fuel injector and device for implementing said methodInfo
- Publication number
- EP1144841A2 EP1144841A2 EP00943547A EP00943547A EP1144841A2 EP 1144841 A2 EP1144841 A2 EP 1144841A2 EP 00943547 A EP00943547 A EP 00943547A EP 00943547 A EP00943547 A EP 00943547A EP 1144841 A2 EP1144841 A2 EP 1144841A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- actuator
- piezo actuator
- compensating ring
- fuel injector
- 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
Links
Classifications
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- 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
- 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
- F02M61/167—Means for compensating clearance or thermal expansion
-
- 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
- F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
- F02M2200/701—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger mechanical
-
- 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
- F02M2200/8053—Fuel injection apparatus manufacture, repair or assembly involving mechanical deformation of the apparatus or parts thereof
-
- 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
- F02M2200/8069—Fuel injection apparatus manufacture, repair or assembly involving removal of material from the fuel apparatus, e.g. by punching, hydro-erosion or mechanical operation
-
- 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
- Y10T137/00—Fluid handling
- Y10T137/598—With repair, tapping, assembly, or disassembly means
- Y10T137/5987—Solenoid or electromagnetically operated valve
-
- 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
- Y10T29/49412—Valve or choke making with assembly, disassembly or composite article making
-
- 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
- Y10T29/49412—Valve or choke making with assembly, disassembly or composite article making
- Y10T29/49416—Valve or choke making with assembly, disassembly or composite article making with material shaping or cutting
- Y10T29/49423—Valve or choke making with assembly, disassembly or composite article making with material shaping or cutting including metal deforming
Definitions
- the invention relates to a method for positioning the actuator in a fuel injector and a device for carrying out the method according to the preamble of patent claim 1 or 6 or patent claim 4 or 7.
- Accumulator injection systems are increasingly used for the fuel supply of internal combustion engines, which work with very high injection pressures and fast switching speeds. Such injection systems are known as common rail systems (for diesel engines) and HPDI injection systems (for gasoline engines). In these accumulator injection systems, the fuel is conveyed by means of a high-pressure pump into a high-pressure accumulator common to all cylinders of the engine, from which the fuel is injected into the individual combustion chambers of the internal combustion engine with the aid of fuel injectors.
- the fuel injector generally comprises an injection valve which is opened and closed hydraulically by a servo valve in order to precisely determine the timing of the injection process in the combustion chamber.
- the servo valve is actuated by an electrically controlled actuator, the use of piezoelectric actuators to achieve sufficiently short switching times being found to be particularly advantageous.
- the application of voltage causes a longitudinal expansion, which is transmitted to the servo valve, which in turn opens or closes the injection valve.
- a fuel injector with a piezo actuator and hydraulic boost is described, for example, in U.S. Patent No. 5,779,149.
- the idle stroke should be as small as possible in order to always have defined conditions and to keep the dynamic loads low.
- a minimum clearance between the actuator and the control element must always be guaranteed in order to avoid malfunctions during operation.
- the setting of the idle stroke in the fuel injector has so far been carried out in such a way that the exact arrangement of the individual components of the fuel injector and, in particular, their distances from one another are determined mathematically from the dimensions of these components.
- each component must be individually measured. After the measurement, the idle stroke is then adjusted by means of adjusting disks arranged between the injector housing and the actuator or the servo valve, which are only allowed to have a minimal tolerance and which are therefore very expensive to manufacture.
- the object of the present invention is to provide a method for positioning the actuator in a fuel injector and a device for carrying out such a method, in which reliable positioning of the actuator in
- Fuel injector is possible and that permits a function test of the fuel injector that is suitable for series production.
- the setting of the idle stroke is carried out in such a way that a defined voltage is applied to the piezo actuator prior to its installation in the fuel injector in order to produce a longitudinal expansion of the piezo elements which exactly corresponds to the desired idle stroke corresponds.
- the base plate of the piezo actuator is ground flat with the housing of the actuator.
- the base plate In the de-energized or de-energized state, the base plate then lags behind the actuator housing by the idle stroke.
- a compensating ring is provided between the piezo actuator and the housing of the fuel injector.
- the compensation ring is inserted into the fuel injector, which is completely assembled except for the piezo actuator, and is deformed by a pretensioning device with a flat effective surface until the servo valve lifts off its valve seat. If you then screw the piezo actuator up to the stop on the compensating ring m the injector housing instead of the pretensioning device , the idle stroke between the base plate of the piezo actuator and the actuating element of the fuel injector servo valve, as previously set, is inevitable.
- an operative connection between the piezo actuator and the control element for the servo valve is formed with fixed positions in such a way that the idle stroke between the piezo actuator and control element always corresponds to the predetermined value despite the inevitable manufacturing tolerances of the individual components.
- the latter is preferably clamped in a grinding machine, the predetermined voltage being applied to the piezo actuator via slip rings.
- the compensation ring is preferably made of soft iron or soft copper. The material of the compensation ring flows during preloading, which permanently changes the thickness of the compensation ring.
- the piezo actuator can also be ground flat prior to its installation without applied voltage, the idle stroke provided being set when the compensating ring is deformed by means of an elevation on the pretensioning device.
- the prestressing device therefore does not consist of a flat stamp, but of a stamp with an embossed front.
- the drawing schematically shows a sectional view of a fuel injector in the area of the connection between a piezo actuator and an actuator for a servo valve.
- the figure of the drawing shows in section a part of an injector for fuel injection into the combustion chamber of an internal combustion engine in a common rail system.
- a piezo actuator 2 with a housing 3 and a base plate 4 is screwed into the housing 1 of the fuel injector.
- a piezo element arrangement (not shown in detail) with which the base plate 4 is connected. If a voltage is applied to the piezoelectric arrangement via leads (also not shown), this changes its length, and the base plate 4 thereby changes its position with respect to the actuator housing 3.
- the piezo actuator 2 When actuated electrically, the piezo actuator 2 acts on a transmission element 5 in the fuel injector housing 1. This means that when a voltage is applied to the above-mentioned piezo element arrangement, the base plate 4 of the piezo actuator 2 shifts outwards, in the drawing downwards, from the actuator housing due to the longitudinal expansion of the piezo elements, the transmission element 5 also moving accordingly becomes.
- the transmission element 5 in the fuel injector housing 1 in turn acts on a valve tappet 6 which bears against a valve element 7 of a servo valve. As long as the piezo actuator 2 is not activated, the valve element 7 is pressed into its valve seat by a spring 8.
- a hydraulic translation of the stroke of the piezo actuator 2 can also be provided.
- the base plate 4 of the piezo actuator 2 acts on an actuating element for the servo valve of the fuel injector.
- Piezo actuator 2 and control element form the actuator for the servo valve.
- valve element 7 When the valve element 7 is lifted from its seat, that is to say when the servo valve is opened, fuel can flow past the valve element 7 in the known manner (see, for example, the aforementioned US Pat. No. 5,779,149) from the control chamber of the injection valve contained in the fuel injector, as a result of which the pressure in the control chamber decreases and the injection valve opens.
- the valve element 7 of the servo valve is pressed back into its seat by the spring 8, so that the pressure in the control chamber of the injection valve is subsequently restored increases and the injector closes.
- a compensation ring 9 is located between the housing 3 of the piezo actuator 2 and the housing 1 of the fuel injector.
- the base plate 4 of the piezo actuator When the piezo actuator 2 is actuated, the base plate 4 of the piezo actuator thus moves relative to its housing 3, which in the installed state is screwed tightly into the housing 1 of the fuel injector.
- the transmission element 5, which can be a mechanical lever translator or a hydraulic translator, transmits this movement to the valve lifter 6, which actuates the valve element 7 of the servo valve.
- the piezo actuator 2 is machined before installation in the injector housing 1 in such a way that the base plate 4 lags behind the housing 3 of the piezo actuator by exactly the predetermined idle stroke ⁇ h .
- the voltage U is applied to the piezo actuator 2 prior to installation in the injector housing 1, which causes a longitudinal expansion of the piezo element arrangement in accordance with the predetermined idle stroke ⁇ h, and the housing 3 and the base plate 4 of the piezo actuator 2 are applied when the voltage U is applied ground flat.
- the piezo actuator 2 can be clamped, for example, in a grinding machine, the voltage U being supplied via slip rings. After the grinding process and after the voltage U has been removed, the base plate 4 then stands back from the housing 3 of the piezo actuator 2 by the predetermined idle stroke ⁇ h.
- Fuel injector are compensated by the compensation ring 9.
- the compensation ring 9 which consists of a soft, deformable material such as soft iron or soft copper, is inserted into the fuel injector which is completely assembled except for the piezo actuator 2. Then, instead of the piezo actuator 2, a pretensioning device is screwed into the fuel injector, the front side of which corresponds to the side of the piezo actuator 2 with the base plate 4, is completely flat. The pretensioning device is screwed in until the valve element 7 of the servo valve begins to lift from its valve seat due to the actuation of the transmission element 5 by the flat front of the pretensioning device.
- the compensating ring 9, which is made of a soft material and on which the flat front side of the pretensioning device also acts, is permanently deformed by material flow. When the pretensioning device is removed, the compensating ring 9 then retains the thickness that it had when the pretensioning device was screwed in just enough that the servo valve began to open.
- the piezo actuator 2 the base plate 4 of which, as described above, lags behind the predetermined idle stroke ⁇ h, is screwed into the housing 1 of the fuel injector, i.e. until the piezo actuator housing 3 rests on the compensating ring 9, the front edge is located of the piezo actuator housing 3 exactly at the height that the front of the pretensioner had when the servo valve began to open.
- the piezo actuator 2 is processed before installation in the injector housing 1 so that the base plate 4 and the housing 3 of the piezo actuator 2 are ground flat in the ready-to-install state, but without applied voltage.
- the base plate 4 of the piezo actuator 2 is thus at exactly the same height as the housing 3 of the piezo actuator 2 after the grinding process.
- the pretensioning device for deforming the compensating ring 9 does not have a flat front side, but a front side which is on the or the Places at which the pretensioning device acts on the transmission element 5 has an elevation of the height ⁇ h.
- the central active surface on the pretensioning device which comes into engagement with the transmission element 5, projects in the installation direction by the predetermined value ⁇ h for the idle stroke compared to the active surface running around the edge, which comes into engagement with the compensating ring 9.
- the prestressing device is so far into the piezo actuator 2
- the idle stroke between piezo actuator 2 and servo valve has exactly the predetermined value ⁇ h on, since the thickness of the compensating ring 9 is adjusted with the pretensioning device so that when the fuel injector is in operation, the servo valve only begins to open after the base plate 4 of the piezo actuator 2 has traveled the free travel ⁇ h when it is actuated.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20040026927 EP1505295B1 (en) | 1999-05-07 | 2000-05-04 | Method of positioning an actuator of a fuel injector and apparatus to carry out the method |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1999121242 DE19921242C1 (en) | 1999-05-07 | 1999-05-07 | Method of positioning control drive in common rail fuel injector for motor vehicle internal combustion engine |
DE19921242 | 1999-05-07 | ||
PCT/DE2000/001408 WO2000068563A2 (en) | 1999-05-07 | 2000-05-04 | Method for positioning the actuating drive in a fuel injector and device for implementing said method |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20040026927 Division EP1505295B1 (en) | 1999-05-07 | 2000-05-04 | Method of positioning an actuator of a fuel injector and apparatus to carry out the method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1144841A2 true EP1144841A2 (en) | 2001-10-17 |
EP1144841B1 EP1144841B1 (en) | 2005-07-20 |
Family
ID=7907408
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20040026927 Expired - Lifetime EP1505295B1 (en) | 1999-05-07 | 2000-05-04 | Method of positioning an actuator of a fuel injector and apparatus to carry out the method |
EP20000943547 Expired - Lifetime EP1144841B1 (en) | 1999-05-07 | 2000-05-04 | Method for positioning the actuating drive in a fuel injector and device for implementing said method |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20040026927 Expired - Lifetime EP1505295B1 (en) | 1999-05-07 | 2000-05-04 | Method of positioning an actuator of a fuel injector and apparatus to carry out the method |
Country Status (4)
Country | Link |
---|---|
US (3) | US6705587B1 (en) |
EP (2) | EP1505295B1 (en) |
DE (3) | DE19921242C1 (en) |
WO (1) | WO2000068563A2 (en) |
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DE10055644A1 (en) * | 2000-11-10 | 2002-05-23 | Siemens Ag | Procedure, for adjusting discharge control of fuel injector, consists of measuring spacing between two defined locations and selecting valve piston to suit. |
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DE10304240A1 (en) * | 2003-02-03 | 2004-10-28 | Volkswagen Mechatronic Gmbh & Co. Kg | Device for transmitting a deflection of an actuator |
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DE102004022958A1 (en) * | 2004-05-10 | 2005-12-22 | Siemens Ag | Fuel injector with a correctable setting of an idle stroke of an actuator unit |
DE102005013911B4 (en) * | 2005-03-24 | 2019-10-02 | Continental Automotive Gmbh | Actuator for actuating a fuel injection valve |
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DE102012205044A1 (en) * | 2012-03-29 | 2013-10-02 | Continental Automotive Gmbh | Finishing method for adjusting primary surface to secondary surface of fuel injector component, involves performing plastic deformation of primary surface and/or secondary surface for reducing dimensional stability deviation |
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- 2000-05-04 DE DE50010750T patent/DE50010750D1/en not_active Expired - Fee Related
- 2000-05-04 DE DE50015988T patent/DE50015988D1/en not_active Expired - Lifetime
- 2000-05-04 WO PCT/DE2000/001408 patent/WO2000068563A2/en active IP Right Grant
- 2000-05-04 US US09/743,183 patent/US6705587B1/en not_active Expired - Fee Related
- 2000-05-04 EP EP20000943547 patent/EP1144841B1/en not_active Expired - Lifetime
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2004
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Also Published As
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DE50010750D1 (en) | 2005-08-25 |
US6705587B1 (en) | 2004-03-16 |
US20040256499A1 (en) | 2004-12-23 |
DE50015988D1 (en) | 2010-10-21 |
US8720852B2 (en) | 2014-05-13 |
WO2000068563A3 (en) | 2001-07-19 |
EP1144841B1 (en) | 2005-07-20 |
WO2000068563A2 (en) | 2000-11-16 |
US7310986B2 (en) | 2007-12-25 |
US20080011972A1 (en) | 2008-01-17 |
EP1505295B1 (en) | 2010-09-08 |
EP1505295A1 (en) | 2005-02-09 |
DE19921242C1 (en) | 2000-10-26 |
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