EP1370762A1 - Kraftstoffeinspritzeinrichtung - Google Patents
KraftstoffeinspritzeinrichtungInfo
- Publication number
- EP1370762A1 EP1370762A1 EP02727209A EP02727209A EP1370762A1 EP 1370762 A1 EP1370762 A1 EP 1370762A1 EP 02727209 A EP02727209 A EP 02727209A EP 02727209 A EP02727209 A EP 02727209A EP 1370762 A1 EP1370762 A1 EP 1370762A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- fuel
- injector
- injection device
- fuel injection
- 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
- F02M63/02—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
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
-
- 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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/04—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure using fluid, other than fuel, for injection-valve actuation
- F02M47/043—Fluid pressure acting on injection-valve in the period of non-injection to keep it closed
-
- 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
- F02M57/00—Fuel-injectors combined or associated with other devices
- F02M57/02—Injectors structurally combined with fuel-injection pumps
- F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
- F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
-
- 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
- F02M59/105—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 hydraulic drive
Definitions
- the invention relates to a fuel injection device according to the preamble of patent claim 1.
- stroke-controlled fuel injection means that the opening and closing of the injection opening takes place with the aid of a displaceable valve element due to the hydraulic interaction of the pressures in a nozzle chamber and in a control chamber.
- a pressure drop within the control chamber causes the valve member to lift.
- the valve member can be deflected by an actuator (actuator, actuator).
- a pressure-controlled fuel injection In a pressure-controlled fuel injection according to the invention, the fuel pressure prevailing in the nozzle space of an injector moves the valve member against the action of a closing force (spring), so that the injection opening is released for an injection of the fuel from the nozzle space into the cylinder.
- injection pressure The pressure at which fuel emerges from the nozzle chamber into a cylinder of an internal combustion engine
- system pressure is understood to mean the pressure at which fuel is available or is stored within the fuel injection device.
- Fuel metering means to provide a defined amount of fuel for injection. Leakage is to be understood as an amount of fuel that is generated during operation of the fuel injection device (for example, a guide leakage), is not used for injection and is returned to the fuel tank.
- the pressure level of this leakage can have a static pressure, the fuel then being expanded to the pressure level of the fuel tank. It is also known to use a pressure booster in order to have a further different injection pressure available in addition to the rail pressure.
- a separate working medium eg hydraulic oil
- actuating the pressure booster has the disadvantage that it is no longer possible to use the rail pressure as the injection pressure.
- a second (lower) fuel system pressure is generated, which can be used for injection.
- the 2nd system pressure is stored in a pressure storage space as required and is constantly applied to the injector.
- a flexible injection course shaping and a multiple injection can be represented.
- a separate high pressure pump can be used for generation.
- the second system pressure can also be provided by storing a subset of the fuel compressed by the DV.
- Fig. 1 shows the use of hydraulic oil for operating a local
- Fig. 2 shows the use of hydraulic oil to operate the local
- Fig. 3 shows another control of the pressure booster when using
- Hydraulic oil for actuating the local pressure booster and for controlling the injector
- Fig. 4 shows the use of hydraulic oil to operate the local
- Fig. 5 shows the use of hydraulic oil to operate the local
- Pressure booster and fuel to control the injector connected to a central pressure storage space
- a reservoir 2 for a working medium e.g. hydraulic oil
- a reservoir 3 for fuel are used.
- a high-pressure pump 4 pumps the working medium hydraulic oil into a central pressure storage chamber 5, in which the hydraulic oil is compressed and stored to a controllable system pressure of approximately 50 bar to 250 bar.
- a working medium high-pressure source is thus provided by the pressure storage space 5.
- a low-pressure fuel pump 6 delivers fuel 3 via a feed line 7 into a pressure chamber 8 of a pressure booster 9.
- a local pressure booster 9 is assigned to each injector 10. Only one pressure booster 9 and one injector 10 are shown in FIG. With the aid of a 3/2-way valve 11, the pressure booster 9 can be activated by connecting a feed line 12 to a primary chamber 13 of the pressure booster 9 either to an oil return 14 or to the pressure storage chamber 5.
- the pressure chamber 8 is connected to a nozzle chamber 16 of the injector 10 via a check valve 15, so that pressure can build up in the nozzle chamber 16.
- a control chamber 17 of the injector 10 connected to the pressure storage chamber 5 can be connected to an oil return 20 with the aid of a 2/2-way valve 18 and a pressure relief throttle 19, so that the pressure in the control chamber 17 can be influenced.
- the injection takes place via a fuel metering with the aid of a nozzle needle 21 which is axially displaceable in a guide bore and which cooperates with a valve seat surface on the injector housing of the injector 10. Injection openings are provided on the valve seat surface of the injector housing.
- a pressure surface pointing in the opening direction of the nozzle needle 21 is exposed to the pressure prevailing there, which is supplied to the nozzle space 1 6 via the feed line 22.
- a pressure piece 24, which delimits the control chamber 17, also acts on the nozzle needle 21.
- the control chamber 17 has an inlet with a first throttle 25 and an outlet via the oil return 20 and the 2/2-way valve 18 from the fuel pressure connection.
- the nozzle chamber 1 6 continues through an annular gap between the nozzle needle 21 and the guide bore up to the valve seat surface of the injector housing.
- the pressure piece 24 is pressurized in the closing direction by the pressure in the control chamber 17.
- the injector 10 is controlled hydraulically by the interaction of the pressures in the nozzle chamber 1 6 and in the control chamber 17 (with a corresponding design of the pressure surfaces).
- the valve 20 When the valve 20 is open, the pressure in the control chamber 17 drops and the nozzle needle 21 releases the injection openings. The injection starts.
- the valve 20 When the valve 20 is closed, a rail pressure builds up again in the control chamber 17 and the nozzle needle 21 closes the injection opening.
- a local pressure booster 9 is assigned to each injector 10 in order to inject fuel with a system pressure that is higher than the pressure storage chamber 5.
- the pressure booster 9 comprises the 3/2-way valve 11 for actuation, a check valve and a piston 26.
- the movable piston 26 separates the primary chamber 13, which can be connected to the pressure storage chamber 5, from a pressure chamber connected to the at least one injector 10 and filled with fuel 8.
- the piston 26 can be pressurized at one end.
- a differential space 27 is relieved of pressure by means of a leakage line, so that the piston 26 can be moved to reduce the volume of the pressure chamber 8.
- the piston 26 is moved in the compression direction, so that the fuel located in the pressure chamber 8 compresses and is supplied to the control chamber 17 and a nozzle chamber 16.
- a check valve prevents compressed fuel from flowing back into the fuel tank.
- An increased pressure can be generated by means of a suitable area ratio in the primary chamber 13 and the pressure chamber 8. If the primary chamber 13 is connected to the leakage line 14 with the aid of the valve 11, the piston 26 is reset and the pressure chamber 8 is refilled. To improve the reset behavior, one or more springs can be provided.
- a first fuel system pressure will thus be generated by means of the pressure translation.
- the check valve 1 5 Through the check valve 1 5, the nozzle space 1 6 and a local pressure storage space 28 remain under pressure when the pressure booster is relieved of pressure by valve 1 1. A constant fuel pressure is thus present at the injector 10. Injection is possible at any time, even if the pressure booster 9 is not activated and therefore does not compress fuel in the compression space 8.
- a second low fuel system pressure is generated that can be used for injection.
- the pressure level in the pressure storage chamber 28 can be set to a desired pressure by means of a pressure relief valve 29 if required.
- the pressure in the pressure storage chamber 28 can decrease via the valve 29 up to its opening pressure.
- a low pressure level of approximately 300 to 500 bar can preferably be set.
- the size of the pressure storage space 28 must be designed in accordance with the desired injection profile.
- the local pressure storage space is preferably used only for a small pre-injection and a short boot phase. Then it can be very small and possibly represented by the existing lines and rooms.
- compressed fuel from the nozzle area is used to control the injector 10 instead of the hydraulic oil from the pressure accumulator 5.
- the pressure storage space 28 is designed accordingly.
- Fig. 3 shows another control of the pressure booster 9 with a 2/2-way valve 31 in a fuel injection device 32.
- the piston 26 is in the. Deactivated state is not completely hydraulically pressure balanced when resetting. This is compensated for by increased spring force.
- a second (lower) fuel system pressure is provided in a fuel injection device 34, which provides a basic fuel pressure in the system.
- the 2nd fuel system pressure is from a high pressure fuel pump 39 generated. If required, this second fuel system pressure can be stored in a central pressure accumulator 33.
- the second fuel system pressure is connected to the pressure chamber 8 and the nozzle chamber 1 6.
- the nozzle chamber 1 6 is therefore always subjected to fuel pressure.
- This fuel pressure can be used for an injection at any time and can e.g. can be used for a pre-injection or a boot phase.
- a pressure control can be provided for the pressure accumulator 33. If the 2nd system pressure is selected higher than the oil pressure of the working medium, the piston experiences a hydraulic restoring force and there is no need for a restoring spring if there are space problems.
- a central pressure booster 36 can also be used instead of a high-pressure pump (fuel injection device 37 of FIG. 6).
- a pressure storage space 33 can also be used for pressure control and / or vibration damping.
- FIG. 7 shows a further circuit possibility, the 3/2-way valve 11 being provided for controlling the pressure booster 9 of a fuel injection device 38 with a central pressure storage space 33.
- the piston experiences a hydraulic restoring force and there is no need for a restoring spring if there are space problems.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10112154A DE10112154A1 (de) | 2001-03-14 | 2001-03-14 | Kraftstoffeinspritzeinrichtung |
DE10112154 | 2001-03-14 | ||
PCT/DE2002/000860 WO2002073024A1 (de) | 2001-03-14 | 2002-03-12 | Kraftstoffeinspritzeinrichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1370762A1 true EP1370762A1 (de) | 2003-12-17 |
EP1370762B1 EP1370762B1 (de) | 2005-08-17 |
Family
ID=7677361
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02727209A Expired - Lifetime EP1370762B1 (de) | 2001-03-14 | 2002-03-12 | Kraftstoffeinspritzeinrichtung |
Country Status (5)
Country | Link |
---|---|
US (1) | US6814057B2 (de) |
EP (1) | EP1370762B1 (de) |
JP (1) | JP2004518872A (de) |
DE (2) | DE10112154A1 (de) |
WO (1) | WO2002073024A1 (de) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1489293B1 (de) * | 2003-06-20 | 2008-03-26 | Delphi Technologies, Inc. | Kraftstoffsystem |
JP4088600B2 (ja) * | 2004-03-01 | 2008-05-21 | トヨタ自動車株式会社 | 増圧式燃料噴射装置の補正方法 |
DE102004010760A1 (de) * | 2004-03-05 | 2005-09-22 | Robert Bosch Gmbh | Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen mit Nadelhubdämpfung |
DE102004053422A1 (de) * | 2004-11-05 | 2006-05-11 | Robert Bosch Gmbh | Kraftstoffeinspritzeinrichtung |
US7603984B2 (en) | 2005-07-18 | 2009-10-20 | Ganser-Hydromag Ag | Accumulator injection system for an internal combustion engine |
US20080047527A1 (en) * | 2006-08-25 | 2008-02-28 | Jinhui Sun | Intensified common rail fuel injection system and method of operating an engine using same |
CN101680410B (zh) | 2007-05-09 | 2011-11-16 | 斯德曼数字***公司 | 具有主动针控制器的多级增强型喷射器和喷射方法 |
NL2002384C2 (nl) * | 2008-03-03 | 2011-04-04 | Vialle Alternative Fuel Systems Bv | Inrichting en werkwijze voor een verbrandingsmotor met directe inspuiting met twee brandstoffen. |
US20100012745A1 (en) * | 2008-07-15 | 2010-01-21 | Sturman Digital Systems, Llc | Fuel Injectors with Intensified Fuel Storage and Methods of Operating an Engine Therewith |
EP2341234A3 (de) * | 2009-12-31 | 2012-02-22 | Indopar B.V. | Direkteinspritzungs-Zweifachbrennstoffsystem für Verbrennungsmotoren |
NL2006992C2 (en) | 2011-06-24 | 2013-01-02 | Indopar B V | Method of switching from a liquefied gas fuel to a liquid fuel being provided to a direct injection combustion engine, and direct injection bi-fuel system for such an engine. |
KR20130027996A (ko) * | 2011-09-08 | 2013-03-18 | 바르질라 스위츠랜드 리미티드 | 내연기관용 연료 분사 시스템, 연료 분사 방법 및 내연기관 |
US9181890B2 (en) | 2012-11-19 | 2015-11-10 | Sturman Digital Systems, Llc | Methods of operation of fuel injectors with intensified fuel storage |
JP6562028B2 (ja) * | 2017-04-11 | 2019-08-21 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
DE102016105625B4 (de) * | 2015-03-30 | 2020-10-08 | Toyota Jidosha Kabushiki Kaisha | Kraftstoffeinspritzvorrichtung für Brennkraftmaschine |
US10738749B1 (en) | 2019-01-18 | 2020-08-11 | Pratt & Whitney Canada Corp. | Method of using heat from fuel of common-rail injectors |
US10865728B2 (en) * | 2019-01-18 | 2020-12-15 | Pratt & Whitney Canada Corp. | Method of using backflow from common-rail fuel injector |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5655769U (de) * | 1979-10-05 | 1981-05-14 | ||
JPS57124073A (en) * | 1981-01-24 | 1982-08-02 | Diesel Kiki Co Ltd | Fuel injection device |
JPH0199948U (de) * | 1987-12-24 | 1989-07-05 | ||
CH689281A5 (de) * | 1994-02-03 | 1999-01-29 | Christian Dipl-Ing Eth Mathis | Kraftstoffeinspritzanlage fuer eine Brennkraftmaschine, insbesondere fuer einen Dieselmotor, sowie ein Verfahren zur Ueberwachung derselben. |
JP2885076B2 (ja) * | 1994-07-08 | 1999-04-19 | 三菱自動車工業株式会社 | 蓄圧式燃料噴射装置 |
US5931139A (en) * | 1997-10-14 | 1999-08-03 | Caterpillar Inc. | Mechanically-enabled hydraulically-actuated electronically-controlled fuel injection system |
DE69905685T2 (de) * | 1998-11-19 | 2003-10-02 | Mitsubishi Motors Corp | Kraftstoffeinspritzvorrichtung der Akkumulatorgattung |
DE19910970A1 (de) * | 1999-03-12 | 2000-09-28 | Bosch Gmbh Robert | Kraftstoffeinspritzeinrichtung |
DE19939421A1 (de) * | 1999-08-20 | 2001-03-01 | Bosch Gmbh Robert | Kombiniertes hub-/druckgesteuertes Kraftstoffeinspritzverfahren und -system für eine Brennkraftmaschine |
DE19939420B4 (de) | 1999-08-20 | 2004-12-09 | Robert Bosch Gmbh | Kraftstoffeinspritzverfahren und -system für eine Brennkraftmaschine |
DE19939422A1 (de) * | 1999-08-20 | 2001-03-01 | Bosch Gmbh Robert | Kraftstoffeinspritzsystem für eine Brennkraftmaschine |
DE10065103C1 (de) * | 2000-12-28 | 2002-06-20 | Bosch Gmbh Robert | Kraftstoffeinspritzeinrichtung |
-
2001
- 2001-03-14 DE DE10112154A patent/DE10112154A1/de not_active Ceased
-
2002
- 2002-03-12 EP EP02727209A patent/EP1370762B1/de not_active Expired - Lifetime
- 2002-03-12 JP JP2002572258A patent/JP2004518872A/ja not_active Withdrawn
- 2002-03-12 US US10/276,148 patent/US6814057B2/en not_active Expired - Fee Related
- 2002-03-12 WO PCT/DE2002/000860 patent/WO2002073024A1/de active IP Right Grant
- 2002-03-12 DE DE50203953T patent/DE50203953D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO02073024A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2004518872A (ja) | 2004-06-24 |
DE50203953D1 (de) | 2005-09-22 |
EP1370762B1 (de) | 2005-08-17 |
WO2002073024A1 (de) | 2002-09-19 |
US20030183198A1 (en) | 2003-10-02 |
US6814057B2 (en) | 2004-11-09 |
DE10112154A1 (de) | 2002-09-26 |
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