WO2010060700A1 - Hochdruckpumpenanordnung - Google Patents
Hochdruckpumpenanordnung Download PDFInfo
- Publication number
- WO2010060700A1 WO2010060700A1 PCT/EP2009/063924 EP2009063924W WO2010060700A1 WO 2010060700 A1 WO2010060700 A1 WO 2010060700A1 EP 2009063924 W EP2009063924 W EP 2009063924W WO 2010060700 A1 WO2010060700 A1 WO 2010060700A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- pump
- arrangement according
- pump arrangement
- fuel
- 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.)
- Ceased
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/102—Mechanical drive, e.g. tappets or cams
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
- F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
- F02D41/3854—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped with elements in the low pressure part, e.g. low pressure pump
-
- 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
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0047—Layout or arrangement of systems for feeding fuel
-
- 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
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0047—Layout or arrangement of systems for feeding fuel
- F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
- F02M37/0058—Returnless fuel systems, i.e. the fuel return lines are not entering the fuel tank
-
- 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
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/04—Feeding by means of driven pumps
- F02M37/08—Feeding by means of driven pumps electrically driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
- F04B49/225—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves with throttling valves or valves varying the pump inlet opening or the outlet opening
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B23/00—Pumping installations or systems
- F04B23/04—Combinations of two or more pumps
- F04B23/08—Combinations of two or more pumps the pumps being of different types
- F04B23/10—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type
Definitions
- the invention relates to a high-pressure pump arrangement.
- Diesel common rail high-pressure pumps are usually designed today with a steel housing or an aluminum housing and a separate cam or eccentric shaft.
- a fuel pump for injection systems of internal combustion engines and manufacturing method thereof comprises a pump housing with a predetermined installation position.
- this pump housing one or more pump units and the pump units respectively associated suction-side check valves are arranged, each opening at a predetermined opening pressure for the introduction of fuel into the associated pump unit.
- Each pump unit comprises a pump piston guided in a radial direction relative to the drive shaft in the pump housing. This is driven by a rotation of the drive shaft through the eccentric shaft portion and an interposed by it eccentric ring for a radial reciprocation.
- each cylinder of the internal combustion engine is associated with a designed as an injection pump plug pump.
- Each plug-in pump has a pump housing with a fuel inlet channel and a fuel return channel.
- each plug-in pump provided with recesses annular plate is arranged, which in a circumferential, a Part of the fuel return passage forming groove of the pump housing engages the respective plug-in pump.
- the internal combustion engine is supplied with fuel via injectors, wherein the fuel is compressed by a high-pressure pump and conveyed to the injectors and wherein at least one pressure regulating valve is provided in a high-pressure line between the high-pressure pump and injectors, whose outlet communicates with a tank and that serves to regulate the fuel pressure at the injectors.
- the fuel discharged at the outlet of the pressure control valve and directed to the tank is directed via a heat exchanger.
- the high-pressure pump can be combined with the pressure control valve and a pre-pressure valve or volume flow control valve to form a structural unit.
- this integrated feed pump is a self-priming pump or an additional pump is required to compensate for pressure losses between the fuel tank and the pre-feed pump. D. h to maintain a desired minimum pressure.
- the additional pump may be an electric pump provided in the fuel tank.
- the high-pressure fuel pump does not have an independent pump housing and if the camshaft of the motor vehicle is used to drive the piston or plunger of the high-pressure fuel pump, then the above described ne integration of a pre-feed pump is no longer possible and it is instead a separate electric pre-feed pump used.
- the object of the invention is to provide a new system design for a high-pressure pump arrangement, in which a media separation between fuel and lubricating oil and a flow control of the fuel can be carried out with a reduced number of components.
- a high-pressure pump assembly according to the present invention is particularly useful in connection with diesel engines having a cylinder number of less than or equal to four cylinders and in the context of diesel engines with medium or small fuel injection quantities.
- the prefeed pump 10 refers from a fuel tank 16 via a fuel supply line 17, in which a filter 18 is arranged, fuel, which they have a further fuel supply line 19 to the pump body. 2 forwards.
- the feed pump 10 is controllable and adjustable with respect to their speed. It is supplied for this purpose by the control unit 11 via a signal connection 14 control signal, such as PWM signals.
- the pump body 2 has a low-pressure inlet 8 and a high-pressure outlet 9. Furthermore, a pressure buildup chamber 12 is provided inside the pump body 2. Within this pressure build-up chamber 12, a plunger 3 is movably supported in order to increase or decrease (suck) the pressure prevailing in the pressure buildup chamber 12 as a function of its direction of movement.
- the plunger 3 is surrounded by a spring 15, whose one end portion is mounted in a recess of the pump body 2 and the other end portion in an element 4, which is in operative connection with the camshaft of the motor vehicle.
- the spring 15 is compressed or pulled apart during a movement of the plunger 3.
- the element 4 cooperates with the camshaft of the respective motor vehicle to effect the up and down movement of the plunger 3.
- the pressure buildup chamber 12 is connected via a high pressure valve 7 to the high pressure outlet 9 of the pump body 2.
- the fuel provided at the high-pressure outlet 9 is forwarded via a high-pressure line 24 to a high-pressure accumulator 20 (rail) and fed from there via further high-pressure lines 25 to injectors 23.
- a pressure sensor 22 and a high-pressure control valve 21 are provided, which are both connected to the control unit 11.
- a suction chamber 6 is provided which has a suction valve 5.
- the suction chamber 6 is connected via an intake passage 13 to the low-pressure inlet 8 of the pump body 2. Furthermore, the intake passage 13 is also for
- Pressure build-up chamber 12 is guided in order to convey fuel from the intake passage 13 to an annular groove 26 in the piston guide can.
- a high-pressure pump arrangement as shown in FIG. 1, requires neither an integrated prefeed pump nor a separate volumetric flow control valve. It uses only a continuously variable speed electric prefeed pump 10, which is used in a pressure range between 0.1 bar and 3 bar absolute pressure and at the same time can perform a throttle function.
- the pump body 2 with the suction valve 5 arranged therein and the high-pressure valve 7 operates basically self-priming. Only in certain operating cases, he is supported by the feed pump 10. These particular operating cases include, for example, a compensation of pressure losses in the fuel supply lines, full fuel delivery, operation in a large geodetic altitude and the engine start.
- the latter is controlled by the control unit 11 using control signals which are supplied to the prefeed pump 10 via the signal connection 14.
- a suitable control of the prefeed pump only a feedforward control of the fuel pressure takes place.
- the actual regulation of the fuel pressure is effected by the high-pressure control valve 21, which simultaneously performs the function of a pressure relief valve and is installed as a separate component on the high-pressure accumulator 20 (rail).
- the fuel pressure in the suction chamber 6 of the pump body 2 is dependent on the operating point so far reduced or throttled until the desired effect of Saugdrosselung and thus a flow control is achieved.
- the suction valve 5 is designed for this mode of operation and operates, for example, with an opening pressure which is less than 1 bar.
- the separation of media between fuel and lubricating oil is realized in that the fuel pressure in the suction chamber 6 is set such that there is always a negative pressure relative to the atmosphere or to the pressure in the camshaft space of the respective motor vehicle.
- At least one leakage ring groove 26 is provided in the pump body 2, which is connected to the suction chamber 6. Due to the negative pressure in the suction chamber 6 creates a suction effect in the Leckageringnut. This prevents overflow of fuel into the lubricating oil. Since such a system is operated only in rare cases in the sense of full delivery, the suction throttling and thus the described negative pressure is the normal operating state. In the rare cases of full delivery, the electric pre-supply pump may only compensate for part of the pressure losses on the suction side in order to maintain the suction effect in the leakage ring groove.
- the expected hydraulic efficiency deterioration can be accepted due to the preference small injection quantities or be compensated in the pump design.
- the ever-present negative pressure in the Leckageringnut makes otherwise necessary additional measures to prevent oil thinning unnecessary.
- the position of the Leckageringnut in the pump body 2 is chosen so that an oil dilution is prevented and leakage of lubricating oil is minimized in the fuel. Penetration of lubricating oil into the fuel could have a negative impact on injector coking as well as the combustion process, which is prevented in a high pressure pump assembly according to the invention.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel-Injection Apparatus (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009801473635A CN102333950B (zh) | 2008-11-26 | 2009-10-22 | 高压泵装置 |
| US13/130,094 US9103307B2 (en) | 2008-11-26 | 2009-10-22 | High-pressure pump arrangement |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008059117.3 | 2008-11-26 | ||
| DE102008059117A DE102008059117B4 (de) | 2008-11-26 | 2008-11-26 | Hochdruckpumpenanordnung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2010060700A1 true WO2010060700A1 (de) | 2010-06-03 |
Family
ID=41683003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2009/063924 Ceased WO2010060700A1 (de) | 2008-11-26 | 2009-10-22 | Hochdruckpumpenanordnung |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US9103307B2 (de) |
| CN (1) | CN102333950B (de) |
| DE (1) | DE102008059117B4 (de) |
| WO (1) | WO2010060700A1 (de) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010064374B3 (de) | 2010-12-30 | 2012-07-12 | Continental Automotive Gmbh | Kraftstoffeinspritzsystem einer Brennkraftmaschine sowie dazugehöriges Druckregelverfahren, Steuergerät und Kraftfahrzeug |
| EP2694221B1 (de) | 2011-04-04 | 2018-08-22 | Silgan Dispensing Systems Corporation | Mit abzugshebel vorgesehene spender mit druckbetätigtem ventil |
| DE102011007781A1 (de) | 2011-04-20 | 2012-10-25 | Continental Automotive Gmbh | Steckpumpe |
| US9528519B2 (en) * | 2012-10-12 | 2016-12-27 | Continental Automotive Systems, Inc. | Pressure control by phase current and initial adjustment at car line |
| DE102013215956A1 (de) * | 2013-08-13 | 2015-02-19 | Continental Automotive Gmbh | Hochdruckpumpe |
| DE102013220600A1 (de) * | 2013-10-11 | 2015-04-16 | Continental Automotive Gmbh | Steckpumpe für ein Common-Rail-System und Motoranordnung mit einem Verbrennungsmotor, einem Common-Rail-System und einer Steckpumpe |
| DE102014225528A1 (de) * | 2014-12-11 | 2016-06-16 | Robert Bosch Gmbh | Verfahren zur Ansteuerung einer Hochdruckpumpe für die Kraftstoffeinspritzung in einen Verbrennungsmotor |
| DE102016107966A1 (de) | 2016-04-06 | 2017-10-12 | Volkswagen Aktiengesellschaft | Bedarfsgerechte Hochdruckpumpe mit variabler Drehzahl |
| US10722431B2 (en) | 2016-08-26 | 2020-07-28 | Changhai Chen | Dispenser system and methods for medication compliance |
| US10073954B2 (en) | 2016-08-26 | 2018-09-11 | Changhai Chen | Dispenser system and methods for medication compliance |
| US11246805B2 (en) | 2016-08-26 | 2022-02-15 | Changhai Chen | Dispenser system and methods for medication compliance |
| CN106246429A (zh) * | 2016-08-30 | 2016-12-21 | 潍柴动力股份有限公司 | 发动机燃油系统及包括这种发动机燃油系统的发动机 |
| FR3068396B1 (fr) * | 2017-06-30 | 2021-11-26 | Continental Automotive France | Procede de commande d'une pompe haute pression de type digitale |
| CN107956669A (zh) * | 2017-11-28 | 2018-04-24 | 奥来救援科技有限公司 | 超高压手动液压泵 |
| DE112021005047T5 (de) * | 2020-12-03 | 2023-09-14 | Cummins Inc. | Kraftstoffpumpenvorrichtungen, Systeme und Verfahren |
| US12601338B2 (en) * | 2022-10-06 | 2026-04-14 | Brackins Machine Shop, Llc | Reciprocating pump with reservoir for collecting and controlling working fluid level without the use of piston seals |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19541086A1 (de) * | 1994-11-30 | 1996-06-13 | Walbro Corp | Ventilanordnung für eine Einweg-Kraftstoffanlage |
| US6230688B1 (en) * | 1997-09-10 | 2001-05-15 | Robert Bosch Gmbh | Process for generating high-pressure fuel and system for generating high fuel pressure |
| EP1195514A2 (de) * | 2000-10-03 | 2002-04-10 | C.R.F. Società Consortile per Azioni | Vorrichtung zur Regelung des Durchflusses einer Hochdruckpumpe in einem Common-rail Kraftstoffeinspritzsystem einer Brennkraftmaschine |
| EP1574704A2 (de) * | 2004-03-11 | 2005-09-14 | Denso Corporation | Kraftstoffeinspritzungssystem mit elektrischer Nierderdruckpumpe |
| DE102004049286A1 (de) * | 2004-10-09 | 2006-04-20 | Robert Bosch Gmbh | Vorrichtung zum Fördern von Kraftstoff |
| DE102006061570A1 (de) * | 2006-12-27 | 2008-07-03 | Robert Bosch Gmbh | Kraftstoffsystem, insbesondere vom Common-Rail-Typ, für eine Brennkraftmaschine |
| DE102009004590A1 (de) * | 2008-01-29 | 2009-07-30 | Ford Global Technologies, LLC, Dearborn | Saugpumpensystem für ein Kraftstoffdirekteinspritzsystem |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3495544A (en) * | 1967-08-30 | 1970-02-17 | Binks Res & Dev | Hydraulic system |
| AT316222B (de) * | 1971-03-24 | 1974-06-25 | Vut V Brne | Einspritzpumpe für Brennkraftmotoren |
| AT307808B (de) * | 1971-04-09 | 1973-06-12 | Friedmann & Maier Ag | Einspritzpumpe |
| US3742822A (en) * | 1971-08-03 | 1973-07-03 | Union Carbide Corp | Close clearance viscous fluid seal system |
| US4982147A (en) * | 1989-01-30 | 1991-01-01 | State Of Oregon Acting By And Through The State Board Of Higher Education On Behalf Of Oregon State University | Power factor motor control system |
| AU6785994A (en) * | 1993-05-06 | 1994-12-12 | Cummins Engine Company Inc. | Variable displacement high pressure pump for common rail fuel injection systems |
| US5629590A (en) * | 1993-10-19 | 1997-05-13 | Futaba Denshi Kogyo Kabushiki Kaisha | Rotational drive control device for variable speed drive motor |
| JP3237549B2 (ja) * | 1996-11-25 | 2001-12-10 | トヨタ自動車株式会社 | 内燃機関の高圧燃料供給装置 |
| DE19834475A1 (de) * | 1998-07-31 | 2000-02-03 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
| DE60038190T2 (de) * | 2000-05-26 | 2009-02-19 | Yanmar Co., Ltd. | Kraftstoffeinspritzpumpe |
| DE10058057A1 (de) | 2000-11-23 | 2002-06-13 | Siemens Ag | Verfahren zum schnelleren Erwärmen einer Brennkraftmaschine in einer Startphase |
| JP4123729B2 (ja) * | 2001-03-15 | 2008-07-23 | 株式会社日立製作所 | 燃料供給装置の制御方法 |
| JP3787508B2 (ja) * | 2001-07-19 | 2006-06-21 | 株式会社日立製作所 | 高圧燃料供給ポンプ |
| US7387109B2 (en) * | 2003-10-21 | 2008-06-17 | Robert Bosch Gmbh | High-pressure fuel pump for an internal combustion engine |
| DE102005050233A1 (de) | 2005-10-20 | 2007-04-26 | Daimlerchrysler Ag | Steckpumpen-Einspritzsystem |
| JP4625789B2 (ja) * | 2006-07-20 | 2011-02-02 | 日立オートモティブシステムズ株式会社 | 高圧燃料ポンプ |
| DE102007002729B3 (de) | 2007-01-18 | 2008-06-05 | Siemens Ag | Kraftstoffpumpe für Einspritzsysteme von Brennkraftmaschinen sowie Herstellungsverfahren hierfür |
| JP2008255868A (ja) * | 2007-04-04 | 2008-10-23 | Mitsubishi Electric Corp | 燃料供給装置 |
-
2008
- 2008-11-26 DE DE102008059117A patent/DE102008059117B4/de active Active
-
2009
- 2009-10-22 CN CN2009801473635A patent/CN102333950B/zh active Active
- 2009-10-22 WO PCT/EP2009/063924 patent/WO2010060700A1/de not_active Ceased
- 2009-10-22 US US13/130,094 patent/US9103307B2/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19541086A1 (de) * | 1994-11-30 | 1996-06-13 | Walbro Corp | Ventilanordnung für eine Einweg-Kraftstoffanlage |
| US6230688B1 (en) * | 1997-09-10 | 2001-05-15 | Robert Bosch Gmbh | Process for generating high-pressure fuel and system for generating high fuel pressure |
| EP1195514A2 (de) * | 2000-10-03 | 2002-04-10 | C.R.F. Società Consortile per Azioni | Vorrichtung zur Regelung des Durchflusses einer Hochdruckpumpe in einem Common-rail Kraftstoffeinspritzsystem einer Brennkraftmaschine |
| EP1574704A2 (de) * | 2004-03-11 | 2005-09-14 | Denso Corporation | Kraftstoffeinspritzungssystem mit elektrischer Nierderdruckpumpe |
| DE102004049286A1 (de) * | 2004-10-09 | 2006-04-20 | Robert Bosch Gmbh | Vorrichtung zum Fördern von Kraftstoff |
| DE102006061570A1 (de) * | 2006-12-27 | 2008-07-03 | Robert Bosch Gmbh | Kraftstoffsystem, insbesondere vom Common-Rail-Typ, für eine Brennkraftmaschine |
| DE102009004590A1 (de) * | 2008-01-29 | 2009-07-30 | Ford Global Technologies, LLC, Dearborn | Saugpumpensystem für ein Kraftstoffdirekteinspritzsystem |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102008059117B4 (de) | 2011-07-28 |
| CN102333950B (zh) | 2013-10-16 |
| DE102008059117A1 (de) | 2010-06-02 |
| CN102333950A (zh) | 2012-01-25 |
| US20110223040A1 (en) | 2011-09-15 |
| US9103307B2 (en) | 2015-08-11 |
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| Date | Code | Title | Description |
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| WWE | Wipo information: entry into national phase |
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