EP1121527A1 - Kraftstoffeinspritzeinrichtung - Google Patents
KraftstoffeinspritzeinrichtungInfo
- Publication number
- EP1121527A1 EP1121527A1 EP00958261A EP00958261A EP1121527A1 EP 1121527 A1 EP1121527 A1 EP 1121527A1 EP 00958261 A EP00958261 A EP 00958261A EP 00958261 A EP00958261 A EP 00958261A EP 1121527 A1 EP1121527 A1 EP 1121527A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- injector
- fuel injection
- injection device
- line
- 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
- 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
- F02M63/06—Use of pressure wave generated by fuel inertia to open injection 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
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
- F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
- F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
-
- 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/002—Arrangement of leakage or drain conduits in or from injectors
-
- 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
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
-
- 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
- F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with 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
- 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
Definitions
- the invention relates to a fuel injection device according to the preamble of patent claim 1.
- the fuel injection device is pressure-controlled.
- an ⁇ ' jerk-controlled fuel injection device is understood to mean that the fuel pressure prevailing in the nozzle chamber of an injector moves a valve member against the action of a closing force (spring), so that the injection opening for injecting the fuel from the nozzle chamber into the cylinder is released.
- the pressure at which fuel emerges from the nozzle chamber into a cylinder of an internal combustion engine is referred to as the injection pressure, while a system pressure is understood to mean the pressure at which fuel is available or is stored within the fuel injection device.
- Fuel metering means a defined fuel quantity for injection Leakage is to be understood as an amount of fuel that is generated during the operation of the fuel injector (e.g. a leadership leak), is not used for injection and is reclaimed to the fuel tank.
- the pressure level of this leakage can have a static pressure, the fuel then being reduced to the pressure level of the Fuel tanks is relaxed
- the injection pressure can be adapted to the load and speed. Pre-injection is often carried out here to reduce noise. Pressure-controlled injection is known to be inexpensive to reduce emissions. In the known pressure-controlled common rail systems, however, a 3/2 Way valve or two 2/2-way valves are used
- a fuel injection device is proposed according to claim 1.
- the use of a single 2/2 way valve as a metering valve per cylinder leads to a more cost-effective system.
- Further developments of the inventions relate to claims 2 to 6 after the end of Injection requires relief of the nozzle space by means of a pressure relief valve or a pressure relief throttle, which are arranged in the connection of the pressure storage space with the injector, in order to avoid a subsequent relief.
- the use of a permanently open and an additional switchable pressure relief throttle facilitates a design of the system without "secondary splashes".
- An additional hydraulic closing force on the valve member accelerates the closing process and also prevents an unwanted opening of the valve member due to pressure fluctuations in the system when the injector instead of a seat or blind hole nozzle having a vano or a vao register nozzle, the injection course can be adapted even better to the requirements of the engine
- FIG. 4 shows the construction of an injector for the fuel injection device according to FIG. 3;
- FIG. 5 shows another construction of an injector for the fuel injection device according to FIG. 3;
- a quantity-controlled fuel pump 2 delivers fuel 3 from a storage tank 4 via a delivery line 5 into a central pressure storage space 6 (common rail), of which several pressure lines 7 corresponding to the number of individual cylinders lead to the individual injectors 8 (injection device) projecting into the combustion chamber of the internal combustion engine to be supplied. Only one of the injectors 8 is shown in more detail in FIG. 1. With the help of the fuel pump 2, a system pressure is generated and stored in the pressure storage chamber 6 at a pressure of 300 to approximately 1800 bar.
- metering valves 9 which are designed as 2/2-way valves.
- the metering valve 9 is a directly actuated force-balanced solenoid valve. But it can also be a piezo actuator with a corresponding coupler space.
- the injection for each cylinder is realized in a pressure-controlled manner.
- the pressure line 7 connects the pressure accumulator chamber 6 to a nozzle chamber 10.
- the injection takes place with the aid of an axially displaceable in a guide bore piston-shaped valve member 11 with a conical valve sealing surface 12 at one end, with which it interacts with a valve seat surface on the injector housing of the injector 8.
- Injection openings are provided on the valve seat surface of the injector housing.
- a pressure surface 13 pointing in the opening direction of the valve member 11 is provided there exposed to the prevailing pressure, which is supplied to the nozzle chamber 10 via the pressure line 7.
- All pressure lines 7 are connected via check valves 14 to a central pressure relief valve 15, that is to say for all pressure lines 7, which enables pressure relief of a pressure line 7 after the injection
- the respective pressure line 7 is separated from the leakage line 16.
- the check valves 14 prevent fuel from the pressure line 7 required for injection from getting into another pressure line 7 that is sometimes not required
- the pre-injection takes place with the pressure relief valve 15 closed and with the metering valve 9 open, which is energized to open after the opening of the
- Metering valve 9 runs a high-pressure fuel wave in the pressure line 7 to the nozzle area
- valve member 11 is lifted against the jerking force from the valve seat surface and the injection process can begin.
- the high-pressure fuel wave also enters a closed leakage line 17. This branching reduces the pressure of the fuel flowing into the nozzle chamber 10 compared to the pressure in the pressure accumulator chamber 6
- the pre-injection is therefore carried out at a lower pressure than that in the
- the injector 8 according to FIG. 1 has a seat or blind hole nozzle. 2 shows, instead of this geometry, a vario or a vario register nozzle of an injector 18 of a second exemplary embodiment.
- the injection sales can be adapted even better to the requirements of the engine.
- the control of the valve member 21 or a hydraulic stroke stop of the valve member 21 can take place locally both within the injector and centrally for all injectors.
- a fuel pump 32 generates a system pressure so that fuel can be stored in a pressure storage space 36 at a pressure of 300 to 1600 bar.
- the metering of fuel from the pressure storage space 36 to each cylinder is carried out with the aid of pressure lines 37 and metering valves 39, only one of which is provided with a reference number in the figure.
- the injection is pressure-controlled by an injector 38 with a valve member 31 against the pressure of a restoring force.
- a simple nozzle or a two-spring nozzle holder can be used as the injector.
- the necessary relief of the pressure line 37 and a nozzle chamber 30 after the injection takes place by means of a pressure relief throttle 40, which connects the pressure line 37 to a leakage line.
- the pressure relief throttle 40 can be located in the injector 38 or on the metering valve 39, which is formed by a 2/2-way valve.
- a valve member 51 of an injector 58 is connected to a pressure piece 52, the end 53 of which faces away from the injection opening can abut against a sealing surface 54.
- the end 53 closes a drain hole 55, so that the connection of a pressure relief throttle 60 to a leakage line 56 is interrupted during the injection process.
- a vario or vario register nozzle of an injector 68 can also be used (FIG. 6).
- the pressure in the nozzle space initially drops only via the pressure relief throttle 79 and the valve member begins the closing process.
- the pressure relief throttle 80 which is still closed, is released, so that the closing operation of the valve member is greatly accelerated.
- the injection per se by means of the fuel injection device according to FIG. 7 takes place analogously to that according to FIG. 3.
- the additional pressure relief throttle 80 leads to a fuel injection device being designed without an unwanted post-injection.
- an injector 88 In addition to a mechanical restoring force, an injector 88, as shown in FIG. 8, also has a hydraulic closing force acting on a valve member 81 in order to close the injection opening of the injector 88.
- a valve member 81 When the valve member 81 is moved in the opening direction, fuel is forced out of a spring chamber 89 and jammed at the throttle 91. The valve member 81 must be moved against hydraulic pressure.
- a separate line 92 connects a nozzle space 100 to the spring space 89 and contains the pressure relief throttle 90.
- Another pressure relief throttle 99 is connected to a pressure line 107, which connects the nozzle space 100 to a pressure storage space. Different pressure areas can be used in the nozzle area and spring area.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19938169A DE19938169A1 (de) | 1999-08-16 | 1999-08-16 | Kraftstoffeinspritzeinrichtung |
DE19938169 | 1999-08-16 | ||
PCT/DE2000/002785 WO2001012982A1 (de) | 1999-08-16 | 2000-08-15 | Kraftstoffeinspritzeinrichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1121527A1 true EP1121527A1 (de) | 2001-08-08 |
EP1121527B1 EP1121527B1 (de) | 2005-04-20 |
Family
ID=7918131
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00958261A Expired - Lifetime EP1121527B1 (de) | 1999-08-16 | 2000-08-15 | Kraftstoffeinspritzeinrichtung |
Country Status (6)
Country | Link |
---|---|
US (1) | US6532938B1 (de) |
EP (1) | EP1121527B1 (de) |
JP (1) | JP2003507623A (de) |
AT (1) | ATE293754T1 (de) |
DE (2) | DE19938169A1 (de) |
WO (1) | WO2001012982A1 (de) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10033428C2 (de) * | 2000-07-10 | 2002-07-11 | Bosch Gmbh Robert | Druckgesteuerter Injektor zum Einspritzen von Kraftstoff |
DE10054526A1 (de) * | 2000-11-03 | 2002-05-16 | Bosch Gmbh Robert | Einspritzdüse |
DE10114252C2 (de) * | 2001-03-22 | 2003-01-30 | Mtu Friedrichshafen Gmbh | Verfahren zum Einspritzen von Kraftstoff in die Brennräume einer Brennkraftmaschine, sowie Kraftstoffeinspritzsystem für eine solche |
SE525208C2 (sv) * | 2003-05-27 | 2004-12-28 | Scania Cv Ab | Bränsleinsprutare |
DE10355411B3 (de) | 2003-11-27 | 2005-07-14 | Siemens Ag | Einspritzanlage und Einspritzverfahren für eine Brennkraftmaschine |
DE102004010760A1 (de) * | 2004-03-05 | 2005-09-22 | Robert Bosch Gmbh | Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen mit Nadelhubdämpfung |
US7428893B2 (en) * | 2004-11-12 | 2008-09-30 | Caterpillar Inc | Electronic flow control valve |
DE102006020634B4 (de) * | 2006-05-04 | 2008-12-04 | Man Diesel Se | Einspritzinjektor für Brennkraftmaschinen |
US8443780B2 (en) | 2010-06-01 | 2013-05-21 | Caterpillar Inc. | Low leakage cam assisted common rail fuel system, fuel injector, and operating method therefor |
US20110297125A1 (en) * | 2010-06-03 | 2011-12-08 | Caterpillar Inc. | Reverse Flow Check Valve For Common Rail Fuel System |
US20140165965A1 (en) * | 2012-12-18 | 2014-06-19 | Michael R. Teets | Fuel supply system with accumulator |
US9470195B2 (en) | 2012-12-18 | 2016-10-18 | Fca Us Llc | Fuel supply system with accumulator |
WO2017174118A1 (de) * | 2016-04-05 | 2017-10-12 | Befinal Gmbh | Kraftstoffaustausch- und kraftstoffförder-system für kraftstoffanlagen |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2907279A1 (de) * | 1979-02-24 | 1980-08-28 | Inst Motorenbau Prof Huber E V | Kraftstoffeinspritzsystem fuer verbrennungsmotoren |
US5109822A (en) * | 1989-01-11 | 1992-05-05 | Martin Tiby M | High pressure electronic common-rail fuel injection system for diesel engines |
DE4019586A1 (de) * | 1990-06-20 | 1992-01-02 | Bosch Gmbh Robert | Kraftstoffeinspritzsystem fuer brennkraftmaschinen |
DE4313852B4 (de) * | 1993-04-28 | 2004-11-25 | Robert Bosch Gmbh | Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen |
DE4330720C2 (de) * | 1993-09-10 | 1996-06-13 | Daimler Benz Ag | Kraftstoffeinspritzanlage für mehrzylindrige Brennkraftmaschinen |
US5647536A (en) * | 1995-01-23 | 1997-07-15 | Cummins Engine Company, Inc. | Injection rate shaping nozzle assembly for a fuel injector |
US5732679A (en) * | 1995-04-27 | 1998-03-31 | Isuzu Motors Limited | Accumulator-type fuel injection system |
DE19618698A1 (de) * | 1996-05-09 | 1997-11-13 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
DE19623211A1 (de) * | 1996-06-11 | 1997-12-18 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
DE19706467C1 (de) * | 1997-02-19 | 1998-03-26 | Daimler Benz Ag | Speichereinspritzsystem für eine mehrzylindrige Brennkraftmaschine |
ATE211525T1 (de) * | 1997-07-16 | 2002-01-15 | Cummins Wartsila S A | Kraftstoffeinspritzvorrichtung für dieselmotoren |
DE29717649U1 (de) * | 1997-10-02 | 1997-11-20 | FEV Motorentechnik GmbH & Co. KG, 52078 Aachen | Direktgesteuertes Einspritzventil, insbesondere Kraftstoffeinspritzventil |
DE19746492A1 (de) * | 1997-10-22 | 1999-04-29 | Bosch Gmbh Robert | Kraftstoffeinspritzanlage für eine Brennkraftmaschine |
DE19812170A1 (de) * | 1998-03-19 | 1999-09-23 | Daimler Chrysler Ag | Kraftstoffeinspritzanlage für eine mehrzylindrige Brennkraftmaschine |
AT2961U3 (de) * | 1998-07-02 | 1999-11-25 | Avl List Gmbh | Speichereinspritzeinrichtung |
JP4445072B2 (ja) * | 1998-10-20 | 2010-04-07 | ヴェルトジィレ シュヴァイツ アクチェンゲゼルシャフト | ディーゼルエンジンのシリンダへの液体噴射装置及びディーゼルエンジン |
-
1999
- 1999-08-16 DE DE19938169A patent/DE19938169A1/de not_active Ceased
-
2000
- 2000-08-15 WO PCT/DE2000/002785 patent/WO2001012982A1/de active IP Right Grant
- 2000-08-15 EP EP00958261A patent/EP1121527B1/de not_active Expired - Lifetime
- 2000-08-15 US US09/807,374 patent/US6532938B1/en not_active Expired - Fee Related
- 2000-08-15 DE DE50010099T patent/DE50010099D1/de not_active Expired - Lifetime
- 2000-08-15 JP JP2001517049A patent/JP2003507623A/ja active Pending
- 2000-08-15 AT AT00958261T patent/ATE293754T1/de not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO0112982A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE19938169A1 (de) | 2001-03-01 |
EP1121527B1 (de) | 2005-04-20 |
JP2003507623A (ja) | 2003-02-25 |
DE50010099D1 (de) | 2005-05-25 |
WO2001012982A1 (de) | 2001-02-22 |
ATE293754T1 (de) | 2005-05-15 |
US6532938B1 (en) | 2003-03-18 |
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