EP0946829B1 - Kraftstoffeinspritzanlage für eine brennkraftmaschine - Google Patents

Kraftstoffeinspritzanlage für eine brennkraftmaschine Download PDF

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Publication number
EP0946829B1
EP0946829B1 EP98942493A EP98942493A EP0946829B1 EP 0946829 B1 EP0946829 B1 EP 0946829B1 EP 98942493 A EP98942493 A EP 98942493A EP 98942493 A EP98942493 A EP 98942493A EP 0946829 B1 EP0946829 B1 EP 0946829B1
Authority
EP
European Patent Office
Prior art keywords
fuel
pressure
piston
injection system
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.)
Expired - Lifetime
Application number
EP98942493A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0946829A1 (de
Inventor
Manfred Ruoff
Horst Harndorf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0946829A1 publication Critical patent/EP0946829A1/de
Application granted granted Critical
Publication of EP0946829B1 publication Critical patent/EP0946829B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • 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
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F02M43/02—Pumps peculiar thereto
    • 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
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F02M43/04—Injectors peculiar thereto
    • 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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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 is based on a fuel injection system for an internal combustion engine according to the preamble of the claim 1.
  • Such fuel injection systems are, for example, from known from DE 43 37 048 C2.
  • a two-component nozzle provided the stratified injection of Fuel and an additional liquid, such as diesel fuel and water serves to reduce pollutant emissions To reduce internal combustion engine and, if necessary, the efficiency to increase.
  • an additional liquid such as diesel fuel and water serves to reduce pollutant emissions To reduce internal combustion engine and, if necessary, the efficiency to increase.
  • the known Injection system also realizes the so-called common rail technology, in which all operating the internal combustion engine High pressure fuel injectors be fed from a common rail pressure accumulator.
  • a disadvantage of the known fuel injection system is that for each individual injector for metering the additional liquid a complex and relatively expensive 3/2-way valve as well as for the control of the diesel injection quantity another 3/2-way valve is required.
  • the additional liquid is the first 3/2-way valve Fuel supply from the common rail pressure accumulator to the injection nozzle interrupted and at the same time the injector surrounding pressure chamber, in the high pressure Fuel is stored through an appropriate position of the first 3/2-way valve to the fuel low pressure side drained out. Due to the pressure drop in the pressure chamber is additional liquid via a corresponding line conveyed into the pressure chamber, which is the corresponding fuel volume repressed.
  • the first 3/2-way valve brought back into a position that connects between the common rail pressure accumulator and the pressure chamber in the injection valve.
  • the amount of fuel to be injected that of the upstream Additional liquid in the through the next valve opening is to follow the injection burst caused
  • Another 3/2-way solenoid valve is provided, which is the rear the nozzle needle by a spring in the closed position is held, either with the common rail pressure accumulator or connects to the fuel low pressure side and thereby the stroke of the valve needle, the opening and Closing the valve and thus the desired injection quantity controls.
  • the known fuel injection system is required the two precisely working for each individual injector and thus complex 3/2-way solenoid valves to both the desired amount of fuel as well as the required amount to be able to precisely dose additional liquid.
  • the fuel injection system according to the invention has constructional simplification and thus for a cheaper manufacture the characteristic features of the claim 1 on.
  • This allows the two elaborate and expensive 3/2 solenoid control valves due to simpler and cheaper 2/2-way valves to be replaced, at the same time the possibility is opened for the quantity dosing Additional liquid on a single, precisely working metering valve to shift that a whole group of injectors can operate.
  • the second 2/2-way valve only the opening and closing times for the additional liquid pre-storage is determined, the quantity dosage for the amount of fuel to be injected by a corresponding Time control of the first 2/2-way valve in the injection line between the common rail pressure accumulator and the Pressure chamber.
  • the nozzle needle at the blunt end of their injector plunger in radial extension small piston that carries high pressure from the common rail pressure accumulator exposed space, which in turn protrudes pressure-tight against the space surrounding the nozzle needle is sealed.
  • An embodiment of the invention is particularly preferred Fuel injection system using the high pressure pump part of a high pressure pump unit to deliver the fuel is both the quantity metering for the Fuel injection as well as for the injection of additional liquid can effect.
  • the commonly used M pump for metering the additional liquid saved and on the other hand the Overall system can be made more compact.
  • the high pressure pump unit which, as before, the common rail pressure accumulator supplied, now operates via another hydraulic line also a separating piston unit, with which the of the High-pressure pump unit predetermined volume of additional liquid is dispensed into the two-substance nozzle.
  • the invention High pressure pump unit one or more high pressure pistons on that fuel against the pressure of compression springs in a compression room to a pressure level of over Compress 1000 bar, usually even at almost 2000 bar.
  • the high pressure pistons are preferably arranged in series and driven by a camshaft.
  • At one end of the Compression chamber outside the stroke of the high-pressure pistons is a longitudinally movable, gap-sealed first piston arranged by means of a compression spring against one also longitudinally movable gap-sealed second piston clamped is.
  • the rear surface of the second piston is rounded or beveled, so that a longitudinally displaceable
  • the dimensioning wedge is frictionally attached to it and the second Piston in a variable relative axial position to the first Can lock piston longitudinally.
  • a controllable Electric motor provided, which drives a spindle, which engages in a thread of the motion wedge.
  • the separating piston unit can also be a special one according to the invention Have configuration, namely instead of a conventional Separating piston is a membrane that is fixed in the separating piston unit is clamped and with an interior Sealing fuel from the other interior with additional liquid separates.
  • a conventional Separating piston is a membrane that is fixed in the separating piston unit is clamped and with an interior Sealing fuel from the other interior with additional liquid separates.
  • the fuel injection system according to the invention for a Internal combustion engine for bifluid fuel injection (usually diesel fuel) and an additional liquid (usually water) a high pressure pump 1 supplies one Common rail pressure accumulator 2 with fuel at a pressure level of around 1800 bar.
  • a high pressure pump 1 supplies one Common rail pressure accumulator 2 with fuel at a pressure level of around 1800 bar.
  • an injection line 6 pressure chamber 3.5 to be supplied with fuel which is the nozzle needle 3.1 surrounds a two-substance nozzle 3
  • must now be a metering Component can be arranged, since the earlier usual classic injection pump through the combination of Common rail pressure accumulator 2 and the simpler high pressure pump 1 was replaced and the rail pressure on a certain Level is constantly present.
  • This task takes over at the arrangement of the invention a first 2/2-way valve MV1.
  • the exact amount is metered over the known (measured or controlled) pressure drop between the commom rail pressure accumulator 2 and that of the two-substance nozzle 3 combustion chamber of the internal combustion engine to be supplied through an exact time window, the size of which is influenced by other factors depends on an electrical control that is not shown in the drawing.
  • the structure and mode of operation of the two-component nozzle used 3 is, apart from minor details, from the prior art Technology known.
  • a small Piston 3.3 is provided, the one facing away from the nozzle needle 3.1 End protrudes into a room 3.6, which over a Line 4 connected directly to the common rail pressure accumulator 2 and the high pressure prevailing there becomes.
  • a path for the fuel to be displaced by the additional liquid from the two-substance nozzle 3 must now be cleared, as is known per se in principle from the prior art.
  • This is done by suitably wiring a second 2/2-way valve MV2, the input of which is connected to the injection line 6 via a supply line 7 and the output of which is connected to the low-pressure fuel side via a discharge line 8.
  • the first 2/2-way valve MV1 is fired and the second 2/2-way valve is switched to passage.
  • fuel under high pressure escapes from the pressure chamber 3.5 via the injection line 6, the feed line 7, the discharge line 8 and a check valve 9 to the low-pressure fuel side, as a rule the fuel tank.
  • M pump 13 which has a working fluid at a pre-pressure level of about 2.5 bar in a separating piston adapter 10 with a Separating piston 11 and a constant pressure valve 12 promotes.
  • the Separating piston adapter 10 separates the operating fluid (in usually diesel fuel) of the M pump 13 to be introduced Additional liquid (usually water). there the water side of a barrel cylinder in the separating piston 11 from a filling pump 14 via a check valve 16 with additional liquid fed at low pressure (p ⁇ 2 bar).
  • the M pump 13 At the right time before the actual injection, between the injection cycles, the M pump 13 a desired amount of operating fluid with a higher Pressure than that with which the check valve 3.4 of the two-substance nozzle 3 is set on the separating piston 11 issued. This will increase the amount of makeup fluid that on the other side of the separating piston 11 the amount of operating fluid corresponds to the M pump 13, via the Constant pressure valve 12 to the additional liquid line 15 passed.
  • the constant pressure valve 12 is used for pressure relief or for the correct pre-pressure supply of the additional liquid line 15 between the separating piston adapter 11 and the two-substance nozzle 3.
  • the second 2/2-way valve MV2 can be a relatively simple one and cheaper valve than the first 2/2-way valve Be MV1 because the accuracy of the latter for the Function of fuel displacement from pressure chamber 3.5 to Purpose of storing additional liquid is not essential is required and otherwise only a clear yes / no behavior valve MV2 is required.
  • FIG distinguishes fuel injection system according to the invention differs from the embodiment shown in Fig. 1 on the one hand by a high pressure pump unit 20 which is in addition to the feed of the common rail pressure accumulator 2 also the volume measurement for additional liquid takes over, on the other hand by a modification of the separating piston unit 40, which is now a membrane instead of a conventional separating piston 43 has.
  • the high-pressure pump unit 20 is operated by a filling pump 19 charged, which takes fuel from a fuel tank 34 and at a pressure level of about 6 bar above Check valve 29.1 in a compression chamber 24 of the high pressure pump unit 20 promotes.
  • a filling pump 19 charged, which takes fuel from a fuel tank 34 and at a pressure level of about 6 bar above Check valve 29.1 in a compression chamber 24 of the high pressure pump unit 20 promotes.
  • Threshold pressure on in the high pressure pump unit 20 integrated exhaust valve 29.2 opened and fuel at a pressure level of approximately 1800 bar in the common rail pressure accumulator 2 promoted, the internal pressure over a Pressure control valve 32 kept constant or to the desired one Level is regulated.
  • the second piston 27 has on its rear surface facing away from the first piston 25 a rounded or beveled top on which a longitudinally displaceable dimensioning wedge 28 is non-positively applied.
  • the pressure is essential for the injection of additional liquid lower (approx. 20 ... 30 bar) than the lowest Pressure in common rail pressure accumulator 2 (approx. 500 bar) a mobility of the first piston 25 for the indirect Metering of additional liquid during the compression phase the high pressure piston 22 may well be possible.
  • the one for quantity metering amount of fuel in additional liquid is, as already described above, pretty accurate the position and the resulting stop of the pistons 25 and 27, the design wedge 28, which in turn from the threaded spindle of the electric motor 30 can be adjusted, specified.
  • the electric motor 30 receives its command from an engine management system not shown in the drawing.
  • the second 2/2-way valve MV2 the correct injector 3 for water pre-storage the amount of diesel to be displaced by the amount of water release in injector 3.
  • the pistons 25 and 27 are simply more or less pressed together so that the first piston 25 does not have a working stroke can do more.
EP98942493A 1997-10-22 1998-07-06 Kraftstoffeinspritzanlage für eine brennkraftmaschine Expired - Lifetime EP0946829B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19746490A DE19746490A1 (de) 1997-10-22 1997-10-22 Kraftstoffeinspritzanlage für eine Brennkraftmaschine
DE19746490 1997-10-22
PCT/DE1998/001864 WO1999020891A1 (de) 1997-10-22 1998-07-06 Kraftstoffeinspritzanlage für eine brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP0946829A1 EP0946829A1 (de) 1999-10-06
EP0946829B1 true EP0946829B1 (de) 2003-11-12

Family

ID=7846176

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98942493A Expired - Lifetime EP0946829B1 (de) 1997-10-22 1998-07-06 Kraftstoffeinspritzanlage für eine brennkraftmaschine

Country Status (7)

Country Link
US (1) US6223734B1 (ko)
EP (1) EP0946829B1 (ko)
JP (1) JP2001506729A (ko)
KR (1) KR20000069463A (ko)
CN (1) CN1107798C (ko)
DE (2) DE19746490A1 (ko)
WO (1) WO1999020891A1 (ko)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005060552B4 (de) * 2005-12-17 2009-06-10 Man Diesel Se Einspritzvorrichtung für Brennstoffmotoren
JP4924413B2 (ja) * 2007-12-28 2012-04-25 日産自動車株式会社 内燃機関の燃料供給装置
CN101806266B (zh) * 2010-03-04 2012-07-11 哈尔滨工程大学 电控单体泵与电控喷油器双阀燃油喷射装置
US20110232601A1 (en) * 2010-03-25 2011-09-29 Caterpillar Inc. Compression ignition engine with blended fuel injection
DE102017211981B3 (de) * 2017-07-13 2018-09-27 Continental Automotive Gmbh Kraftstoffeinspritzsystem für eine Brennkraftmaschine
CN111927667B (zh) * 2020-09-07 2023-12-05 思达耐精密机电（常熟）有限公司 一种高压共轨泵高压泄漏测试系统及应用
CN114704410B (zh) * 2022-04-27 2023-02-03 中船动力研究院有限公司 一种双燃料增压喷射装置

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4612905A (en) * 1980-01-26 1986-09-23 Motoren-Werke Mannheim Ag, Vorm. Benz Stat. Motorenba Fuel injection apparatus
JPS5848771A (ja) * 1981-09-04 1983-03-22 Toyota Motor Corp デイ−ゼルエンジンの燃料噴射装置
GB2126650B (en) * 1982-08-31 1988-02-10 George Stan Baranescu I c engine injection system providing a stratified charge of two fuels
US4524033A (en) * 1983-03-31 1985-06-18 Elledge Jefferson D Multiple fuel carburetor
DE3330774A1 (de) * 1983-08-26 1985-03-14 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzeinrichtung mit vor- und haupteinspritzung bei brennkraftmaschinen
DE3330772A1 (de) * 1983-08-26 1985-03-14 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzeinrichtung
US4693227A (en) * 1985-05-21 1987-09-15 Toyota Jidosha Kabushiki Kaisha Multi-fuel injection system for an internal combustion engine
DE3618447A1 (de) * 1986-05-31 1987-12-03 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung fuer brennkraftmaschinen
US5174247A (en) * 1992-01-22 1992-12-29 Mitsubishi Jukogyo Kabushiki Kaisha Water injection diesel engine
DE4337048C2 (de) 1993-10-29 1996-01-11 Daimler Benz Ag Kraftstoffeinspritzanlage für eine Brennkraftmaschine
US5732679A (en) * 1995-04-27 1998-03-31 Isuzu Motors Limited Accumulator-type fuel injection system
DE19609800C1 (de) * 1996-03-13 1996-11-21 Mtu Friedrichshafen Gmbh Brennstoffeinspritzsystem für Emulsionsbetrieb
FI101739B (fi) * 1996-08-16 1998-08-14 Waertsilae Nsd Oy Ab Ruiskutusventtiilijärjestely
DE19738397A1 (de) * 1997-09-03 1999-03-18 Bosch Gmbh Robert Kraftstoffeinspritzanlage für eine Brennkraftmaschine
DE19746492A1 (de) * 1997-10-22 1999-04-29 Bosch Gmbh Robert Kraftstoffeinspritzanlage für eine Brennkraftmaschine

Also Published As

Publication number Publication date
DE59810161D1 (de) 2003-12-18
EP0946829A1 (de) 1999-10-06
WO1999020891A1 (de) 1999-04-29
KR20000069463A (ko) 2000-11-25
JP2001506729A (ja) 2001-05-22
CN1242820A (zh) 2000-01-26
US6223734B1 (en) 2001-05-01
DE19746490A1 (de) 1999-04-29
CN1107798C (zh) 2003-05-07

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