EP1049860A1 - Kraftstoffeinspritzpumpe - Google Patents
KraftstoffeinspritzpumpeInfo
- Publication number
- EP1049860A1 EP1049860A1 EP99964368A EP99964368A EP1049860A1 EP 1049860 A1 EP1049860 A1 EP 1049860A1 EP 99964368 A EP99964368 A EP 99964368A EP 99964368 A EP99964368 A EP 99964368A EP 1049860 A1 EP1049860 A1 EP 1049860A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control
- pressure
- injection
- fuel injection
- valve
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
- F02D1/16—Adjustment of injection timing
- F02D1/18—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse
-
- 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
- F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
- F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
- F02M41/14—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons
- F02M41/1405—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis
- F02M41/1411—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis characterised by means for varying fuel delivery or injection timing
- F02M41/1416—Devices specially adapted for angular adjustment of annular cam
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
- F02D1/16—Adjustment of injection timing
- F02D1/18—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse
- F02D1/183—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse hydraulic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
- F02D1/16—Adjustment of injection timing
- F02D1/18—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse
- F02D1/183—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse hydraulic
- F02D2001/186—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse hydraulic using a pressure-actuated piston for adjustment of a stationary cam or roller support
Definitions
- the invention is based on a fuel injection pump according to the preamble of the main claim.
- a fuel injection pump known from DE-OS 24 58 109
- the pressure in the pressure chamber enclosed by the injection adjuster piston in the cylinder is controlled by a 2/3 directional control valve which connects the pressure chamber either to a pressure oil delivery pump or to a relief line .
- the injection adjustment piston is displaced against the force of the spring and adjusted in accordance with the start of injection of the associated fuel injection pump.
- the control takes place in such a way that the spray adjustment piston is adjusted between a first position that opens the relief line and a second position that opens the pressure line by corresponding actuation of the 2/3 directional control valve.
- pressure-oil-absorbing cell chambers are provided between a drive member and a driven member of the fuel injection pump, the connection of which to an oil feed pump or to a relief channel is controlled by a 2/4 directional control valve.
- fuel is supplied to the oil pump by one of the pressure chambers supplied and fuel from the other of the pressure chambers via a relief line. If the 2/4 directional control valve is in a different position, the fuel is supplied and removed in the opposite direction.
- the fuel injection pump according to the invention with the characterized features of the main claim has the advantage that the configuration of the valve member of the control valve as a slide makes it possible to control exact control of the inflow or outflow from the pressure chamber with low actuating forces.
- a previously set one can be closed by the control collar of the slide by closing the connecting line
- Positioning of the injection plunger can be maintained.
- the connecting line By closing the connecting line, the restoring forces transmitted from the cam ring to the injection adjustment piston, which occur during the respective pump piston delivery stroke of the fuel injection pump, are absorbed, since the volume which is enclosed in the cylinder by the injection adjustment piston is formed as a closed volume with the cooperation of the control valve and only evasive the injection adjusting piston is realized within the framework of the elastic compressibility of the enclosed hydraulic column.
- the injection adjustment piston assumes the previously desired position and thus controls the recommencement of injection in the desired exact manner.
- the pressure in the pressure chamber can be changed by opening the pressure chamber to the pressure source or to the relief line.
- the control slide it is also possible to produce overflow cross sections of different sizes between the connecting line and the pressure line or relief line, so that the pressure change rate in the pressure chamber can be of different heights in accordance with the control of the control valve.
- the valve spool is adjusted by an electromagnet which adjusts the valve spool analogously or proportionally to a control value.
- the control slide can also be actuated in a clocked manner, which reduces the idle friction which counteracts an adjustment when the valve slide is deflected from longer stationary positions.
- both the pressure chamber, which is located on one side, are controlled by the control valve
- Front side of the injection adjustment piston is located, as well as a second pressure chamber, which continues opposite on the other end side of the injection adjustment piston with pressurized medium by the pressure in these pressure chambers by appropriate design of the Control valve spool is complementarily controlled by controlling the pressure medium flow.
- the control slide is advantageously equipped with two control collars which, in a central position, close the respective connecting lines between the control valve and the pressure chambers on the injection adjustment piston, so that it assumes a neutral position previously preset by the corresponding actuation of the control valve. If operating parameters change, a rapid, efficient adjustment of the injection adjustment piston can be brought about by supplying pressure medium in one pressure chamber and removing pressure medium from the other pressure chamber. Above all, the adjustment speed of the injection adjustment piston can also be increased here.
- the injection adjustment piston can assume a preferred position of the injection start adjustment in the case of pressure medium delivery quantities that are not yet available, by means of which the starting of the internal combustion engine is favored. In In this position, the pressure chambers are advantageously closed by the control slide and the spray start adjustment piston has moved under the action of the spring and made possible by the leakage losses on the circumference of the injection adjustment piston into said preferred position.
- the contact surface can be arranged slightly offset from the spray adjustment piston axis, which has the advantage that in this way an automatic self-alignment of the
- Injection-adjusting piston to the coupling part is ensured, so that the axis of the recess remains essentially coincident with the axis of the coupling part.
- Figure 1 shows a first embodiment with only one pressure chamber controlled by the control valve
- Figure 2 shows a second embodiment with two complementary controlled by the control valve pressure chambers.
- the cam drive of a fuel injection pump has, in a known manner, a cam track on which rollers run, with relative motion being generated when the pump pistons roll, by means of which the pump pistons move back and forth
- a cam disc In the case of a reciprocating piston pump, this is a cam disc, and in the case of a radial piston pump, this is e.g. B. a cam ring 1, as indicated in Figure 1.
- This is rotatably mounted in a circular recess 2 in the housing 3 of the fuel injection pump. Pointing inwards, to the axis of the circular recess 2, the cam ring 1 has a cam track 4 on which rollers 6 mounted in a roller shoe 5 run and thereby radial movements caused by the cams 7 of the cam track onto the pump pistons 8, of which only here one is shown.
- a coupling part 11 is provided in the form of a radially projecting pin which is formed in one piece with the cam ring and which extends through an opening 12 in the wall of the circular recess 2 into a in the housing 3 of the fuel injection pump arranged cylinder 14 protrudes and is coupled there with an injection adjusting piston 15 which is longitudinally displaceable in a cylinder 14.
- the injection adjusting piston 15 has a first end face 16 which, together with the closed end of the cylinder 14, encloses a first pressure chamber 17 and has on its opposite side a second end face 18, which together with the closed end of the cylinder 14 there has a second pressure-relieved pressure chamber 20 includes. Between the closed end of the cylinder 14 and the second end face 18, a compression spring 21 is clamped, which axially loads the injection adjustment piston 15 in the direction of a preferred position. The coupling between the coupling part 11 and the injection adjustment piston 15 takes place via a radially oriented recess 22 in the injection adjustment piston 15 in the region of its central lateral surface.
- This recess is so deep that the pin 11 extends into the region of the longitudinal axis 23 of the injection adjusting piston and there has a line of contact 24 of its head-like end with the cylindrical part of the recess 22 surrounding it. Actuating forces from the pump piston 8 via the cams 7 in
- the line of contact can be substantially aligned with the injection piston axis, but it can also be slightly z. B. 2 to 6 mm radially offset from this axis thereof. This has the advantage that a small torque in the circumferential direction acts on the injection adjusting piston in such a way that the recess 22 aligns coaxially with the pin 11 and thus a preferred position of the pump piston is automatically maintained without additional guide means being required.
- a pressure medium source is provided for actuating the injection adjustment piston.
- B. can be the fuel supply pump of the fuel injection pump, which delivers speed-dependent fuel to a suction chamber of the fuel injection pump, from which the fuel to be injected is then directed into the pump work chambers, compressed there and then for injection by the pump pistons 8 to the injection Valves is deployed.
- the per se speed-dependent pressure that the speed-dependent delivery pump generates can also cause speed-dependent control processes. For this purpose, the pressure is controlled more precisely by additional pressure valves and is now also available as an actuating medium
- the fuel pressure is via a control valve 26 to the first pressure chamber 17 via a connecting line 27. This opens directly into the pressure chamber 17 without the inflowing fuel having any radial force and tilting moments on it
- Injection adjusting piston 15 is generated and axially loaded exclusively by this hydraulic force against the force of the compression spring 21.
- the connecting line 27 ends at the other end in a valve cylinder 28 in which a control slide 29 is slidably arranged.
- This carries two frets on a shaft 30, a first collar in the form of a control collar 32 and a second collar in the form of a guide collar 33.
- the control collar 32 sits at the end of the shaft 30 and is loaded on its axial end face by a return spring 35 which is in contact with one another is supported on the closed end face of the valve cylinder 28 and lies in a space which is relieved by a relief line 36.
- annular space 37 which is in constant communication with the pressure medium source, the suction space, of the fuel injection pump via a pressure line 38.
- a further space is enclosed, which is also relieved of pressure by a relief line 36.
- the stem 30 leads out of the valve cylinder and is connected there to the armature of a proportional electromagnet (not shown further here), which causes the control slide 29 to be adjusted counter to the force of the return spring 25 in accordance with its energization.
- the control collar 32 has the Entry of the connecting line 27 in the valve cylinder 28 is closed. A certain pressure has set in this space, which is counteracted by the force of the compression spring 21, so that the adjusting piston 15 assumes a force-balanced resulting position.
- control slide 29 is actuated, for. B. to the left so that fuel from the pressure line 38 via the annular space 37 in the
- Connection line 27 can flow and can increase the pressure in the first pressure chamber 17 until there is again a balance of forces with the compression spring 21.
- This adjustment is advantageously monitored by a sensor which detects the adjustment position of the cam ring 1, emits a signal to a control device which compares it with a setpoint value and gives a corresponding control signal to the proportional magnet of the control valve, which moves the control slide into the position for the respective adjustment of the adjusting piston moves the necessary position.
- Adjustment of the force balance on it moves to the left. This adjustment is again detected by the rotation angle sensor, not shown further.
- the control can also be influenced by other parameters that are decisive for the start of spray setting.
- This embodiment has the advantage that the inflow rate of pressure fluid can be influenced by the degree of opening of the connecting line from the annular space 37 to the first pressure space 17. Correspondingly quickly can with large
- the inflow cross section of the injection adjustment pistons can be adjusted, and a desired position of the injection adjustment piston can also be set exactly by means of an exact feedback of the injection start adjustment result with the electromagnetic intervention on the control valve 29 via the proportional solenoid. Effects in the intermediate area due to the delivery processes of the pump pistons 8 are absorbed by closing the connecting line 27.
- the start of injection adjustment device is simple in construction and easy to implement and has the advantage of a balanced force balance on the injection adjustment piston while avoiding radial forces. A long service life of the injection adjustment piston is achieved due to the low frictional forces.
- a control slide 129 is now provided, which in principle is constructed similarly to the control slide according to FIG. 1.
- both frets serve as control frets.
- the control collar 32 adjoining the compression spring 35 and the collar previously used as a guide collar is now one
- Control collar 133 Again, the pressure medium is supplied via the pressure line 38 in the center of the outer surface of the valve cylinder 28 into the annular space 37, which acts upon the control slide 8 in a force-balanced manner when pressure is applied.
- the pressure areas of the two frets are the same size.
- the first control collar 32 controls the first connecting line 27 into the first pressure chamber 17
- the second control collar 133 now controls a second connecting line 127 into the second pressure chamber 120, which is now no longer basically relieved of pressure.
- the control collars 32 and 133 close the respective openings of the connecting lines 27 and 127 into the valve cylinder 28.
- the two pressure chambers 17 and 120 are thus hydraulically locked and the position of the Injection adjustment piston 15 is fixed.
- the compression spring 121 can only be effective in the region of a position of the injection adjustment piston that goes beyond a preferred position.
- control slide 129 is now in turn z. B. actuated by a proportional magnet, for. B. to the left against the force of the spring 35.
- a connection between the annular space 37 and the first pressure chamber 17 is established so that hydraulic fluid can get into the first pressure chamber 17.
- the connecting line 127 to the relief line 36 is opened by the second control collar 133, so that hydraulic fluid can escape from the second pressure chamber 120. This creates an imbalance of forces on
- Adjusting piston of a pronounced size so that it moves very quickly to the right until a certain position of the injection adjusting piston 15 is fixed by correcting the position of the control slide 29.
- This process is also regulated via a control loop in which the injection start adjustment angles are queried and, in accordance with the deviation from a predetermined setpoint, the proportional magnet now actuates the opening of the connecting lines 27, 127 or is set to close them.
- the control slide 129 is moved to the right, so that pressure medium can flow into the second pressure chamber 120 via the connecting line 127 and pressure medium can also escape from the first pressure chamber 17 via the connecting line 27 to the relief line 36.
- Axial vibrations are generated, which ensure that the spool is constantly in motion and hysteresis due to frictional forces is largely avoided.
- the compression spring 121 can be achieved that z. B. at the start of the internal combustion engine, which is supplied with fuel by the fuel injection pump and from which the fuel injection pump is driven, a preferred position can be set.
- the pressure chambers 17 and 120 are hydraulically locked according to Figure 2.
- the compression spring 121 can nevertheless move the injection adjustment piston 15 into a preferred position, because of a leakage flow along the lateral surface of the injection adjustment piston.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- High-Pressure Fuel Injection Pump Control (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19854766A DE19854766A1 (de) | 1998-11-27 | 1998-11-27 | Kraftstoffeinspritzpumpe |
DE19854766 | 1998-11-27 | ||
PCT/DE1999/003722 WO2000032919A1 (de) | 1998-11-27 | 1999-11-24 | Kraftstoffeinspritzpumpe |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1049860A1 true EP1049860A1 (de) | 2000-11-08 |
EP1049860B1 EP1049860B1 (de) | 2005-04-27 |
Family
ID=7889221
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99964368A Expired - Lifetime EP1049860B1 (de) | 1998-11-27 | 1999-11-24 | Kraftstoffeinspritzpumpe |
Country Status (7)
Country | Link |
---|---|
US (1) | US6413054B1 (de) |
EP (1) | EP1049860B1 (de) |
JP (1) | JP2002531747A (de) |
KR (1) | KR20010034375A (de) |
DE (2) | DE19854766A1 (de) |
PL (1) | PL341910A1 (de) |
WO (1) | WO2000032919A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7726948B2 (en) * | 2002-04-03 | 2010-06-01 | Slw Automotive Inc. | Hydraulic pump with variable flow and variable pressure and electric control |
DE60333503D1 (de) * | 2002-04-03 | 2010-09-02 | Slw Automotive Inc | Pumpe mit variabler Förderleistung und Steuerung dafür |
US8444395B2 (en) | 2006-01-31 | 2013-05-21 | Magna Powertrain, Inc. | Variable displacement variable pressure vane pump system |
DE102007002031B4 (de) * | 2007-01-13 | 2013-12-24 | Audi Ag | Pumpe mit einem Verstellelement |
DE102007033146B4 (de) * | 2007-07-13 | 2012-02-02 | Schwäbische Hüttenwerke Automotive GmbH & Co. KG | Verstellventil für die Verstellung des Fördervolumens einer Verdrängerpumpe |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2680412A (en) * | 1950-08-08 | 1954-06-08 | John E Entwistle | Variable volume variable pressure pump |
JPS5339939B2 (de) | 1973-12-10 | 1978-10-24 | ||
DE2839014A1 (de) * | 1978-09-07 | 1980-03-20 | Bosch Gmbh Robert | Kraftstoffeinspritzpumpe fuer brennkraftmaschinen |
JPS58143133A (ja) * | 1982-02-22 | 1983-08-25 | Mitsuwa Seiki Co Ltd | 燃料噴射時期制御装置 |
GB8619994D0 (en) * | 1986-08-16 | 1986-09-24 | Lucas Ind Plc | Fuel injection pump |
JPH03188427A (ja) * | 1989-12-19 | 1991-08-16 | Zexel Corp | 分配型燃料噴射ポンプの噴射時期制御装置 |
US5059096A (en) * | 1990-12-26 | 1991-10-22 | Lucas Industries Public Limited Company | Fuel pumping apparatus |
JP3215962B2 (ja) * | 1993-12-09 | 2001-10-09 | 株式会社ボッシュオートモーティブシステム | 電子式燃料噴射装置の噴射時期調整装置 |
DE4419992A1 (de) * | 1994-06-08 | 1995-12-14 | Bosch Gmbh Robert | Kraftstoffeinspritzpumpe für Brennkraftmaschinen |
EP0690220A1 (de) * | 1994-06-29 | 1996-01-03 | Lucas Industries Public Limited Company | Pumpe mit veränderbarer Fördermenge |
GB9414308D0 (en) * | 1994-07-15 | 1994-09-07 | Lucas Ind Plc | Advance mechanism |
GB2296111A (en) * | 1994-12-16 | 1996-06-19 | Rover Group | Timing of fuel delivery in a distributor-type fuel injection pump |
DE19706821A1 (de) * | 1997-02-21 | 1998-08-27 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Regelung eines Stellelements |
-
1998
- 1998-11-27 DE DE19854766A patent/DE19854766A1/de not_active Withdrawn
-
1999
- 1999-11-24 DE DE59911983T patent/DE59911983D1/de not_active Expired - Lifetime
- 1999-11-24 EP EP99964368A patent/EP1049860B1/de not_active Expired - Lifetime
- 1999-11-24 PL PL99341910A patent/PL341910A1/xx not_active Application Discontinuation
- 1999-11-24 US US09/600,916 patent/US6413054B1/en not_active Expired - Fee Related
- 1999-11-24 KR KR1020007008126A patent/KR20010034375A/ko not_active Application Discontinuation
- 1999-11-24 JP JP2000585536A patent/JP2002531747A/ja active Pending
- 1999-11-24 WO PCT/DE1999/003722 patent/WO2000032919A1/de not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO0032919A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE59911983D1 (de) | 2005-06-02 |
KR20010034375A (ko) | 2001-04-25 |
DE19854766A1 (de) | 2000-05-31 |
US6413054B1 (en) | 2002-07-02 |
EP1049860B1 (de) | 2005-04-27 |
WO2000032919A1 (de) | 2000-06-08 |
JP2002531747A (ja) | 2002-09-24 |
PL341910A1 (en) | 2001-05-07 |
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