WO2001000986A1 - Common-rail-injektor - Google Patents
Common-rail-injektor Download PDFInfo
- Publication number
- WO2001000986A1 WO2001000986A1 PCT/DE2000/002028 DE0002028W WO0100986A1 WO 2001000986 A1 WO2001000986 A1 WO 2001000986A1 DE 0002028 W DE0002028 W DE 0002028W WO 0100986 A1 WO0100986 A1 WO 0100986A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- injector
- pressure accumulator
- common rail
- injection
- nozzle
- Prior art date
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
- 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
- F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
- F02M63/0007—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using electrically actuated valves
-
- 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
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
- F02F2007/0097—Casings, e.g. crankcases or frames for large diesel engines
-
- 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
-
- 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
- F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator
Definitions
- the invention relates to a common rail injector for the injection of fuel in a common rail injection system of an internal combustion engine, in particular a large diesel internal combustion engine, with an injector housing which is connected to a central high-pressure accumulator and in which a nozzle needle against the biasing force of a nozzle spring, which is accommodated in a nozzle spring chamber, is axially displaceable by the injector housing which is connected to a central high-pressure accumulator and in which a nozzle needle against the biasing force of a nozzle spring, which is accommodated in a nozzle spring chamber, is axially displaceable by the
- a high-pressure pump delivers the fuel to the central one
- High-pressure accumulator which is referred to as a common rail. High-pressure lines lead from the high-pressure accumulator to the individual injectors, which are assigned to the engine cylinders. The injectors are individually controlled by the engine electronics. The rail pressure is applied to a pressure-balanced 3/2-way solenoid valve, which keeps the high-pressure holes to the conventional injection nozzle depressurized. Only when the solenoid is energized does the 3/2-way solenoid valve open the connection from the rail to the injection nozzle, and the fuel reaches the combustion chamber via the nozzle needle raised against the spring force. The start and end of spraying are thus determined by the start and end of the energization of the magnet. The duration of energization is decisive for the injection quantity.
- High-pressure accumulators have a negative impact on the starting behavior and the dynamic behavior of the injection system because the time required for a change in the system pressure increases.
- the object of the invention is to improve the damping behavior in a common rail injection system.
- the task is with a common rail injector for the injection of fuel in a common rail injection system of an internal combustion engine, in particular a large diesel engine, with one
- Injector housing which is connected to a central high-pressure accumulator and in which a nozzle needle can be axially displaced against the biasing force of a nozzle spring, which is accommodated in a nozzle spring chamber, in order to adjust the start of injection and the injection quantity depending on the position of a 3/2-way valve , solved in that in the injector housing
- Injector pressure accumulator is integrated, which is connected to the central high pressure accumulator regardless of the position of the 3/2-way valve.
- the pressure accumulator serves to dampen the pressure waves emanating from the central pressure accumulator during and after the injection.
- a special embodiment of the invention is characterized in that the volume of the injector pressure accumulator is 10 to 20 times the maximum injection quantity. This value has proven to be particularly advantageous in tests carried out in the context of the present invention.
- a further special embodiment of the invention is characterized in that the injector pressure accumulator is connected to an unpressurized space via a damping unit integrated in the injector housing.
- the total volume of the injector pressure accumulator and the central high pressure accumulator can be as a result of the
- the damping unit comprises a damping throttle and a safety valve.
- the central high-pressure accumulator is normally equipped with a safety valve that opens when there is excess pressure. This can e.g. be the case when the system pressure control loop is not working properly. In the event of mechanical failure of the safety valve controlled by the system pressure control loop, major damage can occur to the internal combustion engine. System security is increased by integrating the safety valve into the injector housing.
- the safety valve normally provided on the central high-pressure accumulator can be omitted.
- Screw plug is integrated, which is screwed into the injector housing between the nozzle spring chamber and the injector pressure accumulator.
- This embodiment has the advantage that it can be implemented particularly simply and inexpensively.
- Another particular embodiment of the invention is characterized in that the injector pressure accumulator is connected to a fuel tank via the damping unit integrated in the injector housing. This provides the advantage that the injector pressure accumulator is relieved to the fuel tank if the pressure in the injector accumulator is greater than the system pressure.
- the figure shows an embodiment of an injector 1 according to the invention in longitudinal section.
- a conventional injection nozzle 2 is formed at the end of the injector 1 which is directed downward in the figure.
- the solenoid valve 3 is controlled by a control unit 4.
- the control unit 4 is coupled to a central high-pressure accumulator 5 and a fuel pump unit 6.
- the fuel pump unit 6 delivers fuel from a fuel tank 7 into the central high-pressure accumulator 5.
- the fuel delivered in the fuel pump unit is subjected to high pressure.
- the fuel pressurized with high pressure comes from the central high pressure accumulator 5 via a
- An injector pressure accumulator 10 is formed in the injector housing 9.
- the injector pressure accumulator 10 is covered by a section of a longitudinal bore through the injector housing 9 educated.
- the injector pressure accumulator 10 is connected to the central high pressure accumulator 5 via the high pressure line 8.
- the end of the injector pressure accumulator 10 facing away from the injection nozzle 2 opens into a valve bore 11 which extends transversely to the longitudinal axis of the injector 1.
- a valve piston 12 is received in the valve bore 11.
- the valve piston 12 is axially displaceable in the valve bore 11 between two valve positions, which are defined by valve seats 13 and 14.
- valve spring 22 which is accommodated in a valve spring chamber 21, pushes the valve piston 12 to the right.
- the injector pressure accumulator 10 is connected to the fuel tank 7 via an unpressurized drain line 15.
- the solenoid valve 3 When the solenoid valve 3 is energized, the valve piston 12 moves against the biasing force of the valve spring 22 to the left.
- the connection between the injector pressure accumulator 10 and the unpressurized drain line 15 is closed and a connection between the
- Injector pressure accumulator 10 released via the valve bore 11 to a high pressure bore 16.
- the high-pressure fuel can pass through the high-pressure bore 16 from the injector pressure accumulator 10 to the injection nozzle 2.
- a nozzle needle 17 can be moved back and forth against the biasing force of a nozzle spring 18.
- the nozzle spring 18 is accommodated in a nozzle spring chamber 19, which is formed by a section of the longitudinal bore through the injector housing 9.
- the nozzle spring chamber 19 is connected to the valve spring chamber 21 via a bore 20.
- the valve spring chamber 21 in turn is connected to the drain line via a bore 23 J th 1 CD L ⁇ o ⁇ ⁇
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
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/763,468 US6561165B1 (en) | 1999-06-24 | 2000-06-21 | Common rail injector |
EP00952859A EP1108136B1 (de) | 1999-06-24 | 2000-06-21 | Common-rail-injektor |
JP2001506375A JP2003503629A (ja) | 1999-06-24 | 2000-06-21 | コモンレールインジェクタ |
DE50009469T DE50009469D1 (en) | 1999-06-24 | 2000-06-21 | Common-rail-injektor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19928906.9 | 1999-06-24 | ||
DE19928906A DE19928906A1 (de) | 1999-06-24 | 1999-06-24 | Common-Rail-Injektor |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001000986A1 true WO2001000986A1 (de) | 2001-01-04 |
Family
ID=7912355
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2000/002028 WO2001000986A1 (de) | 1999-06-24 | 2000-06-21 | Common-rail-injektor |
Country Status (5)
Country | Link |
---|---|
US (1) | US6561165B1 (de) |
EP (1) | EP1108136B1 (de) |
JP (1) | JP2003503629A (de) |
DE (2) | DE19928906A1 (de) |
WO (1) | WO2001000986A1 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10060811A1 (de) * | 2000-12-07 | 2002-06-13 | Bosch Gmbh Robert | Kraftstoffeinspritzsystem für Brennkraftmaschinen |
DE10060812A1 (de) * | 2000-12-07 | 2002-06-13 | Bosch Gmbh Robert | Kraftstoffeinspritzsystem für Brennkraftmaschinen |
DE10103089A1 (de) * | 2001-01-24 | 2002-08-08 | Bosch Gmbh Robert | 3/2-Wegeventil |
DE10105031A1 (de) * | 2001-02-05 | 2002-08-14 | Bosch Gmbh Robert | Vorrichtung zur Dämpfung von Druckpulsationen in Hochdruckeinspritzsystemen |
DE10348291B4 (de) * | 2003-10-17 | 2012-06-06 | Mtu Friedrichshafen Gmbh | Einrichtung zur Befestigung eines Kraftstoffinjektors für eine Brennkraftmaschine |
US6997165B2 (en) * | 2003-12-19 | 2006-02-14 | Caterpillar Inc. | Pressure control valve for a fuel system |
CN101487405B (zh) * | 2005-02-02 | 2012-05-30 | 曼柴油机和涡轮公司,德国曼柴油机和涡轮欧洲股份公司的联营公司 | 一种十字头型大型两冲程柴油机 |
KR100960647B1 (ko) * | 2005-02-02 | 2010-06-07 | 맨 디젤 필리얼 아프 맨 디젤 에스이, 티스크랜드 | 유압 작동 배기 가스 밸브를 가지는 대형 2행정 디젤 엔진 |
DE112008002239B4 (de) * | 2007-08-21 | 2017-12-14 | Toyota Jidosha Kabushiki Kaisha | Kraftstoffeinspritzsteuervorrichtung einer Brennkraftmaschine |
DE102012208075A1 (de) | 2012-05-15 | 2013-11-21 | Man Diesel & Turbo Se | Injektor für eine Kraftstoffversorgungsanlage einer Brennkraftmaschine sowie Kraftstoffversorgungsanlage |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3151065A1 (de) * | 1981-12-23 | 1983-07-21 | Daimler-Benz Ag, 7000 Stuttgart | "mit einem speicher versehene einspritzanlage fuer brennkraftmaschinen" |
US4566416A (en) * | 1981-07-31 | 1986-01-28 | Stanadyne, Inc. | Accumulator nozzle fuel injection system |
DE4427378A1 (de) * | 1994-08-03 | 1996-02-08 | Bosch Robert Gmbh & Co Kg | Magnetventilgesteuerter Injektor zur Kraftstoffeinspritzung in den Brennraum einer Dieselbrennkraftmaschine |
US5524826A (en) * | 1993-12-07 | 1996-06-11 | Robert Bosch Gmbh | Fuel injection device for internal combustion engines |
DE19715234A1 (de) * | 1997-04-12 | 1998-06-25 | Daimler Benz Ag | Magnetventilgesteuertes direkteinspritzendes Kraftstoffeinspritzventil für Speichereinspritzsysteme von mehrzylindrigen Brennkraftmaschinen |
DE19716220A1 (de) * | 1997-04-18 | 1998-10-22 | Bosch Gmbh Robert | Kraftstoffeinspritzeinheit für Brennkraftmaschinen |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4246876A (en) * | 1979-01-19 | 1981-01-27 | Stanadyne, Inc. | Fuel injection system snubber valve assembly |
US4306680A (en) * | 1980-05-12 | 1981-12-22 | General Motors Corporation | Compression operated injector |
JPS60192872A (ja) * | 1984-03-15 | 1985-10-01 | Nippon Denso Co Ltd | 蓄圧式燃料噴射弁 |
DE3521427A1 (de) * | 1985-06-14 | 1986-12-18 | Robert Bosch Gmbh, 7000 Stuttgart | Kraftstoffeinspritzvorrichtung |
JP2550528B2 (ja) * | 1986-06-12 | 1996-11-06 | トヨタ自動車株式会社 | 内燃機関の燃料噴射装置 |
JPS6371561A (ja) * | 1986-09-13 | 1988-03-31 | Kubota Ltd | ディーゼルエンジンの蓄圧式燃料噴射器 |
US4911127A (en) * | 1989-07-12 | 1990-03-27 | Cummins Engine Company, Inc. | Fuel injector for an internal combustion engine |
US5012786A (en) * | 1990-03-08 | 1991-05-07 | Voss James R | Diesel engine fuel injection system |
US5295469A (en) * | 1990-07-09 | 1994-03-22 | Nippondenso Co., Ltd. | Safety valve for fuel injection apparatus |
JP3191562B2 (ja) * | 1994-05-23 | 2001-07-23 | トヨタ自動車株式会社 | 圧縮着火式内燃機関の燃焼方法 |
DE4341543A1 (de) * | 1993-12-07 | 1995-06-08 | Bosch Gmbh Robert | Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen |
DE4417950C1 (de) * | 1994-05-21 | 1995-05-11 | Mtu Friedrichshafen Gmbh | Einspritzsystem |
-
1999
- 1999-06-24 DE DE19928906A patent/DE19928906A1/de not_active Ceased
-
2000
- 2000-06-21 DE DE50009469T patent/DE50009469D1/de not_active Expired - Fee Related
- 2000-06-21 EP EP00952859A patent/EP1108136B1/de not_active Expired - Lifetime
- 2000-06-21 US US09/763,468 patent/US6561165B1/en not_active Expired - Fee Related
- 2000-06-21 JP JP2001506375A patent/JP2003503629A/ja active Pending
- 2000-06-21 WO PCT/DE2000/002028 patent/WO2001000986A1/de active IP Right Grant
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4566416A (en) * | 1981-07-31 | 1986-01-28 | Stanadyne, Inc. | Accumulator nozzle fuel injection system |
DE3151065A1 (de) * | 1981-12-23 | 1983-07-21 | Daimler-Benz Ag, 7000 Stuttgart | "mit einem speicher versehene einspritzanlage fuer brennkraftmaschinen" |
US5524826A (en) * | 1993-12-07 | 1996-06-11 | Robert Bosch Gmbh | Fuel injection device for internal combustion engines |
DE4427378A1 (de) * | 1994-08-03 | 1996-02-08 | Bosch Robert Gmbh & Co Kg | Magnetventilgesteuerter Injektor zur Kraftstoffeinspritzung in den Brennraum einer Dieselbrennkraftmaschine |
DE19715234A1 (de) * | 1997-04-12 | 1998-06-25 | Daimler Benz Ag | Magnetventilgesteuertes direkteinspritzendes Kraftstoffeinspritzventil für Speichereinspritzsysteme von mehrzylindrigen Brennkraftmaschinen |
DE19716220A1 (de) * | 1997-04-18 | 1998-10-22 | Bosch Gmbh Robert | Kraftstoffeinspritzeinheit für Brennkraftmaschinen |
Also Published As
Publication number | Publication date |
---|---|
DE19928906A1 (de) | 2001-01-11 |
EP1108136A1 (de) | 2001-06-20 |
DE50009469D1 (en) | 2005-03-17 |
JP2003503629A (ja) | 2003-01-28 |
EP1108136B1 (de) | 2005-02-09 |
US6561165B1 (en) | 2003-05-13 |
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