EP1095215A1 - Brennstoffeinspritzventil - Google Patents
BrennstoffeinspritzventilInfo
- Publication number
- EP1095215A1 EP1095215A1 EP99962124A EP99962124A EP1095215A1 EP 1095215 A1 EP1095215 A1 EP 1095215A1 EP 99962124 A EP99962124 A EP 99962124A EP 99962124 A EP99962124 A EP 99962124A EP 1095215 A1 EP1095215 A1 EP 1095215A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- fuel injection
- injection valve
- actuator
- excitation coil
- 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
- 239000000446 fuel Substances 0.000 title claims abstract description 81
- 238000002347 injection Methods 0.000 title claims abstract description 50
- 239000007924 injection Substances 0.000 title claims abstract description 50
- 238000013016 damping Methods 0.000 claims abstract description 43
- 238000002485 combustion reaction Methods 0.000 claims abstract description 8
- 230000006698 induction Effects 0.000 claims description 36
- 230000005284 excitation Effects 0.000 claims description 31
- 238000007789 sealing Methods 0.000 claims description 14
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 description 12
- 238000007906 compression Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 11
- 230000004907 flux Effects 0.000 description 8
- 230000007423 decrease Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
-
- 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
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
Definitions
- the invention relates to a fuel injector according to the preamble of claim 1.
- a fuel injection valve according to the preamble of claim 1 is known from O89 / 10478.
- the damping device resulting from this document consists of a pot-shaped damping element, a weak compression spring with a low spring coefficient and a strong compression spring with a high spring coefficient.
- the two compression springs are axially offset from one another and enclose the valve needle in sections.
- the cup-shaped damping element is located between the two compression springs, the two pressure springs acting in the opposite direction on the cup-shaped damping element and each being supported on the side facing away from the cup-shaped damping element on the valve needle attached to support elements.
- the weak compression spring counteracts the closing of the fuel injector, the strong compression spring counteracts the opening of the fuel injection valve.
- the known fuel injector has the following disadvantages: the damping force is predetermined by the spring force and the shear force and can therefore not be adapted to the operating variables of the internal combustion engine, in particular it cannot be adjusted in time. Since the fuel inflow in the direction of the sealing seat is influenced by the damping disk, flow swirls occur in the fuel, whereby the ductility of the fuel outflow is impaired. Am proposed in the O89 / 10478 as an alternative fuel inlet below the damping plate is impractical, since this significantly increases the size of the drain-side valve housing. The additional mechanical components also make the fuel injector more susceptible to wear, particularly since the damping force depends on the width of the between the edge of the damping element and the inner wall. Valve housing trained gap.
- the fuel injector according to the invention with the characterizing features of claim 1 has the advantage that the fuel injector m is debounced satisfactorily. Furthermore, the electromagnetic damping device does not require any mechanically stressed components such as compression springs and disc springs and does not require any damping fluid. Furthermore, the damping device is temperature stable and enables a variable damping force.
- the damping device advantageously has an excitation coil for generating a magnetic field and at least one electrically conductive induction loop arranged on the valve needle.
- the electromagnetic field m required for the damping can thereby be generated in a simple manner.
- the damping force can act directly on the valve needle.
- the excitation coil is wound on a valve housing of the fuel injector, the valve housing having a circumferential groove for this. This results in a manufacturing tech iscn simple accommodation of the excitation coil, or the excitation coil is well protected and easy to replace.
- the electrical conductivity of the induction loop is greater than the electrical conductivity of the valve needle. This creates an m of Induction loop induced ring voltage an electrical induction current carried in the induction loop.
- the induction loop is electrically insulated from the valve needle.
- the electromotive force is used particularly well.
- the induction loop is sleeve-shaped and encloses the valve needle in sections. This results in a shape of the induction loop which is adapted to the geometry of the fuel injection valve and which also enables simple attachment to the valve needle.
- the axial length of the induction loop along the valve axis is advantageously smaller than the axial length of the excitation coil along the valve axis. This induces a larger ring tension m of the sleeve.
- a control device for current-controlled control of the excitation coil and / or the actuator advantageously has a current control. This enables precise, quickly reacting control of the damping force acting on the valve needle.
- the excitation coil is advantageously connected to the actuator in a row in order to utilize the displacement current which arises when the actuator is compressed. As a result, the energy stored in the actuator can be used to vaporize the valve needle.
- Fig. 1 shows an excerpt axial section through a first gameforementionedsbei one of the invention Fuel injection valve, wherein the fuel injection valve is designed to open inwards;
- FIG. 2 shows an embodiment of a control of a fuel injection valve according to the invention
- FIG. 3 shows a schematic diagram to explain the functioning of an exemplary embodiment of a fuel injector according to the invention
- FIG. 4 shows diagrams for explaining an exemplary embodiment of a fuel injection valve according to the invention
- FIG. 5 shows a circuit diagram for an exemplary embodiment of a fuel injection valve according to the invention.
- FIG. 6 diagrams for explaining an embodiment of an inventions
- FIG. 1 shows a partial axial sectional view of a device according to the invention
- Fuel injection valve 1 is used in particular for the direct injection of fuel, in particular gasoline, into a combustion chamber of a mixture-compressing, spark-ignited internal combustion engine as a so-called gasoline direct injection valve.
- the fuel injection valve 1 according to the invention is, however, also suitable for other applications.
- the fuel injection valve 1 is designed as a men-opening fuel injection valve 1.
- the fuel injection valve 1 has a valve housing 2 and an end plate 3.
- a valve needle 4 is located in the valve housing 2 by means of an axially movable valve needle 4 actuatable valve closing body 5, which is formed in one piece with the illustrated embodiment with the valve needle 4.
- the valve closing body 5 is frustoconical and tapered in the spraying direction.
- the valve closing body 5 interacts with a valve seat surface 7 formed on a valve seat body 6 to form a sealing seat.
- the valve seat body 6 is fastened in the front part of the valve housing 2.
- the contact element 12 On an inner contact surface 10, which is formed on a projection 11 of the valve housing 2, lies on the contact element 12.
- the contact element 12 can be designed to be plastically or elastically deformable.
- An intermediate plate 13 is fastened by a screw element 14 in the interior 16 of the fuel injector 1. The intermediate plate 13 is pressed by the screw element 14 against the contact element 12, whereby the contact element 12 is deformed. In order to apply the force required for this, the screw element 14 is screwed in with an internal thread 15, which is formed on the inside of the valve housing 2.
- a piezoelectric actuator 21 rests on the inflow-side end face 20 of the intermediate plate 13, and a compression spring 23 rests on the sealing face-side end face of the intermediate plate 13.
- the actuator 21 and the compression spring 23 are enclosed by a tubular housing wall 24, the tubular housing wall 24 having cutouts 25a, 25b through which the intermediate plate 13 projects.
- the tubular housing wall 24 is connected to a housing plate 25 on the inflow side and a housing plate 26 on the sealing seat side.
- the tubular housing wall 24, the inflow-side housing plate 25 and the sealing seat-side housing plate 26 together form an inner housing 24, 25, 26.
- the actuator 21 acts via the inflow-side housing plate 25 on the inner housing 24, 25, 26 and the compression spring 23 acts via the sealing seat side Housing plate 26 on the inner housing 24, 25, 26 em.
- the valve seat 4 is fastened on the sealing seat side housing plate 26.
- the fuel is passed through a bore 30 in the end plate 3 into the interior 16 of the fuel injector 1. From there it is passed through at least one bore 31 in the intermediate plate 13 in the direction of the sealing seat formed from valve seat surface 7 and valve closing body 5.
- the actuator 21 When the actuator 21 is actuated, it expands, as a result of which the inner housing 24, 25, 26 moves in the direction of the end plate 3 and lifts the valve closing member 5 attached to the valve needle 4 from the valve seat surface 7, as a result of which the sealing seat opens.
- Fuel enters an injection channel 32 via the gap formed between valve seat surface 7 and valve closing element 5, as a result of which fuel emerges from fuel injection valve 1 into a combustion chamber of an internal combustion engine.
- the fuel injector 1 is closed via the compression spring 23, which acts against the actuator 21 on the inner housing 24, 25, 26, as a result of which the inner housing 24, 25, 26 shifts in the direction of the valve seat body 6 and the valve closing body 5 of the valve needle 4 on the Valve seat surface 7 of the valve seat body 6 is moved. As a result, the sealing seat formed from valve seat surface 7 and valve closing body 5 closes.
- the electromagnetic damping device according to the invention for damping the movement of the valve needle 4 is formed from sleeves 40a to 40c and an excitation coil 41, which is wound in a circumferential groove 42 on the valve housing 2 of the fuel injection valve 1.
- the movement of the valve needle 4 is usually limited by a suitable stop.
- this is Limitation simplified represented by the stop of the inflow-side housing plate 25 on stop elements 43a, 43b.
- the valve closing body 5 of the valve needle 4 strikes the valve seat surface 7 of the valve seat body 6.
- the valve needle 4 bounces because of the movement impulse that occurs when opening or closing, as a result of which the sealing seat is not opened with a constant opening cross section or is not closed abruptly.
- the sleeves 40a to 40c are electrically insulated from the valve needle 4 and from each other. This isolation can e.g. B. done by a paint or an oxide layer. If the space around the sleeves 40a to 40c is filled with fuel, a suitable sealing of the sleeves against the fuel can be provided. Alternatively, it is possible to manufacture the sleeves 40a to 40c from a material which has a higher electrical conductivity than the valve needle 4.
- FIG. 2 shows a circuit diagram, which represents the wiring of the actuator 21 and the excitation coil 41 in a simplified manner.
- electrical feed lines 50a, 50b m the fuel injection valve 1 are guided to the actuator 21.
- electrical feed lines 50c, 50d m lead the fuel injection valve 1 to the excitation coil 41.
- the electrical feed lines 50a to 50d are connected to the control unit 51. It is advantageous if the control device 51 controls the coil 41 in a current-controlled manner, since this counteracts the coil inductivity 11 when the current intensity I L changes due to a correspondingly high voltage of the control device 51, which is supplied to the coil 41 via the electrical leads 50c, 50d can be.
- the control device 51 makes it possible, depending on the operating variables of the internal combustion engine, to actuate the actuator 21 and the coil 41 in a coordinated manner in order to prevent the valve needle 4 from bouncing.
- Fig. 3 is a schematic diagram to explain the functional principle of the damping device of the
- Excitation coil 41 flowing current I L generates em radially symmetrical magnetic field B, which is proportional to
- Coil current I L is.
- the finite length 1 L of the coil 41 m in the axial direction results in an inhomogeneous magnetic field
- Spulenach.se 55 is present for a change in location m of the order of length 1 L of the coil 41.
- an induction loop 56 which represents the edge of a surface A which is not necessarily flat.
- One of the two sides of the area A can be arbitrarily defined as
- Induction loop 56 changed. According to Faraday's law of induction, a temporal change in the magnetic flux ⁇ flowing through the induction loop 56 creates an electrical m opposite the direction of rotation 58 of the induction loop 56 in the induction loop 56
- Induction loop 56 an electrical current that at
- em magnetic field B 1 is generated.
- the magnetic field B ' is oriented in the opposite (same) direction as the magnetic field B.
- oppositely directed magnetic fields B, B 1 the induction loop 56 is repelled by the excitation coil 41, with unidirectional magnetic fields B, B ', the induction loop 56 is attracted by the excitation coil 41.
- the induction loop 56 when the magnetic flux ⁇ increases, the induction loop 56 is repelled by the excitation coil 41 and when the magnetic flux ⁇ decreases, the induction loop 56 is attracted by the excitation coil 41.
- the associated force K 0 is used according to the invention for damping the valve needle 4.
- FIG. 4 shows diagrams by means of which the functioning of the damping device of the fuel injector 1 according to the invention is explained.
- the time t is in each case on the abscissa and the various operating variables of the are in the ordinates
- Fuel injector 1 applied. For the sake of simplicity, only the closing process of the fuel injection valve 1 is considered below. The mode of operation of the damping device of the fuel injection valve 1 can accordingly be transferred to the opening process.
- the actuator 21 In the open state of the fuel injector 1, the actuator 21 is acted upon by an electrical actuator voltage U A until the time t a . Since the actuator voltage U A is constant up to the point in time t a , the position of the valve needle 4 also remains unchanged, which corresponds to a constant valve needle stroke h.
- the actuator 21 is switched off. From time t a to time t ⁇ the fuel injector 1 is closed, whereby the stroke h of the valve needle 4 decreases. In an undamped fuel injector 1, the valve needle 4 bounces, causing the valve needle 4 to come out the sealing seat is lifted, which corresponds to additional lifting movements 60a to 60d.
- FIG. 5 shows an alternative circuit for wiring the fuel injection valve 1 according to the invention, in which the excitation coil 41 is connected in series with the actuator 21 in order to utilize the displacement current generated when the actuator 21 is compressed.
- An equivalent circuit diagram consisting of a loss-free inductance L and a loss resistor R L is shown for the excitation coil 41, while an equivalent circuit diagram consisting of a loss-free capacitance C and a loss resistor R A is shown for the actuator 21.
- the function of the damping device according to the invention is shown on the basis of the diagrams shown in FIG. 6 when it is connected as in FIG. 5.
- the opening of the fuel injection valve 1 is considered.
- the functional principle can also be applied to the closing of the fuel injection valve 1.
- the time t is plotted on the abscissa in the diagrams.
- the voltage U is increased at time ti to time t 2 .
- the stroke h of the valve needle 4 increases.
- the valve needle 4 bounces after opening the fuel injection valve 1, as a result of which additional valve needle strokes 60a to 60c occur.
- the induction current m of the induction loop 56 ie the sleeves 40a to 40c, is generated.
- the valve needle 4 is damped by the induction current I ⁇ nc ⁇ .
- the time course of the stroke h 1 of the valve needle 4 therefore has no additional valve needle lifts 60a to 60c, which are caused by bouncing the valve needle 4. At most, therefore, there is an additional weak valve needle stroke 60e.
- the invention is not limited to the exemplary embodiments described.
- the invention is also suitable for an externally opening fuel injection valve 1.
- the damping device does not necessarily have to act directly on the valve needle 4 and can also be arranged differently in the fuel injection valve 1.
- At the Valve needle 4 can also be arranged instead of an induction loop 56, a permanent magnet which, together with the excitation coil 41, forms an electromagnetic damping device.
- the induction loop 56 can also be formed by a wound coil instead of sleeves 40a-40c.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19921489 | 1999-05-08 | ||
DE19921489A DE19921489A1 (de) | 1999-05-08 | 1999-05-08 | Brennstoffeinspritzventil |
PCT/DE1999/003869 WO2000068564A1 (de) | 1999-05-08 | 1999-12-02 | Brennstoffeinspritzventil |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1095215A1 true EP1095215A1 (de) | 2001-05-02 |
EP1095215B1 EP1095215B1 (de) | 2004-08-11 |
Family
ID=7907576
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99962124A Expired - Lifetime EP1095215B1 (de) | 1999-05-08 | 1999-12-02 | Brennstoffeinspritzventil |
Country Status (5)
Country | Link |
---|---|
US (1) | US6612539B1 (de) |
EP (1) | EP1095215B1 (de) |
JP (1) | JP2002544426A (de) |
DE (2) | DE19921489A1 (de) |
WO (1) | WO2000068564A1 (de) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003016707A1 (de) * | 2001-08-08 | 2003-02-27 | Siemens Aktiengesellschaft | Dosiervorrichtung |
DE10153630A1 (de) | 2001-10-31 | 2003-07-10 | Bosch Gmbh Robert | Brennstoffeinspritzventil |
US7131423B2 (en) * | 2004-10-06 | 2006-11-07 | Point-Man Aeronautics, L.L.C. | Fuel injection spark ignition system |
FR2916810B1 (fr) * | 2007-05-31 | 2009-08-28 | Renault Sas | Dispositif d'injection de fluide |
US20090057438A1 (en) * | 2007-08-28 | 2009-03-05 | Advanced Propulsion Technologies, Inc. | Ultrasonically activated fuel injector needle |
WO2009158147A1 (en) * | 2008-06-27 | 2009-12-30 | Cameron International Corporation | Systems and devices including valves coupled to electric devices and methods of making, using, and operating the same |
US8069836B2 (en) * | 2009-03-11 | 2011-12-06 | Point-Man Aeronautics, Llc | Fuel injection stream parallel opposed multiple electrode spark gap for fuel injector |
US20130068200A1 (en) * | 2011-09-15 | 2013-03-21 | Paul Reynolds | Injector Valve with Miniscule Actuator Displacement |
US9115678B2 (en) | 2012-08-09 | 2015-08-25 | Ford Global Technologies, Llc | Magnetized fuel injector valve and valve seat |
EP2954569A4 (de) * | 2013-02-06 | 2016-11-02 | Great Plains Diesel Technologies L C | Magnetostriktiver aktor |
EP2860386A1 (de) * | 2013-10-10 | 2015-04-15 | Continental Automotive GmbH | Injektor für eine Brennkraftmaschine |
US9157349B2 (en) * | 2014-03-04 | 2015-10-13 | Ali Farzad Farzaneh | High power two cycle engine (without oil and gasoline/benzene mixing) |
DE102015219568B4 (de) * | 2015-10-09 | 2017-06-08 | Continental Automotive Gmbh | Aktuator mit Ventileinheit für piezoservobetriebenen Injektor |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3501077A1 (de) * | 1985-01-15 | 1986-07-17 | Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe | Pulsventil |
JPS61167364A (ja) * | 1985-01-18 | 1986-07-29 | Diesel Kiki Co Ltd | 高速電磁弁 |
DE3533975A1 (de) * | 1985-09-24 | 1987-03-26 | Bosch Gmbh Robert | Zumessventil zur dosierung von fluessigkeiten oder gasen |
JPS63143361A (ja) * | 1986-12-04 | 1988-06-15 | Aisan Ind Co Ltd | インジエクタ用バルブの制御方法 |
US4878650A (en) | 1988-04-29 | 1989-11-07 | Allied-Signal Inc. | Armature with shear stress damper |
DE3833093A1 (de) * | 1988-09-29 | 1990-04-12 | Siemens Ag | Fuer verbrennungskraftmaschine vorgesehene kraftstoff-einspritzduese mit steuerbarer charakteristik des kraftstoffstrahls |
US4994698A (en) * | 1990-06-13 | 1991-02-19 | General Electric Company | Vibratory linear motor system |
DE19546033A1 (de) | 1995-12-09 | 1997-06-12 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
DE19735232A1 (de) | 1997-08-14 | 1999-02-18 | Bosch Gmbh Robert | Verfahren zur Dämpfung eines Brennstoffeinspritzventiles und Brennstoffeinspritzventil |
-
1999
- 1999-05-08 DE DE19921489A patent/DE19921489A1/de not_active Withdrawn
- 1999-12-02 EP EP99962124A patent/EP1095215B1/de not_active Expired - Lifetime
- 1999-12-02 US US09/743,313 patent/US6612539B1/en not_active Expired - Fee Related
- 1999-12-02 WO PCT/DE1999/003869 patent/WO2000068564A1/de active IP Right Grant
- 1999-12-02 DE DE59910219T patent/DE59910219D1/de not_active Expired - Fee Related
- 1999-12-02 JP JP2000617320A patent/JP2002544426A/ja active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO0068564A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2002544426A (ja) | 2002-12-24 |
US6612539B1 (en) | 2003-09-02 |
DE19921489A1 (de) | 2000-11-09 |
EP1095215B1 (de) | 2004-08-11 |
WO2000068564A1 (de) | 2000-11-16 |
DE59910219D1 (de) | 2004-09-16 |
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