EP0946830B1 - Kraftstoffeinspritzanlage für eine brennkraftmaschine - Google Patents

Kraftstoffeinspritzanlage für eine brennkraftmaschine Download PDF

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Publication number
EP0946830B1
EP0946830B1 EP98954191A EP98954191A EP0946830B1 EP 0946830 B1 EP0946830 B1 EP 0946830B1 EP 98954191 A EP98954191 A EP 98954191A EP 98954191 A EP98954191 A EP 98954191A EP 0946830 B1 EP0946830 B1 EP 0946830B1
Authority
EP
European Patent Office
Prior art keywords
fuel
pressure
additional
injection system
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.)
Expired - Lifetime
Application number
EP98954191A
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German (de)
English (en)
French (fr)
Other versions
EP0946830A1 (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 EP0946830A1 publication Critical patent/EP0946830A1/de
Application granted granted Critical
Publication of EP0946830B1 publication Critical patent/EP0946830B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • 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 4337 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.
  • Fuel injection system is used to promote the Additional liquid uses a membrane, one of which Side with the prevailing in the common rail pressure accumulator High pressure is applied, and the other side due the pressure pulses in the common rail pressure accumulator either directly or via a lever mechanism to promote the additional liquid into the additional liquid line leading to the two-substance nozzle causes.
  • the indirect delivery of additional liquid can, for example via a pump piston, which is carried out by a Lever mechanism is connected to the membrane and at Pressure changes in the common rail pressure accumulator that lead to a Membrane movement, a corresponding amount of additional liquid promotes.
  • a pump piston which is carried out by a Lever mechanism is connected to the membrane and at Pressure changes in the common rail pressure accumulator that lead to a Membrane movement, a corresponding amount of additional liquid promotes.
  • a massive partition wall also mass wall
  • the membrane at one end of the common rail pressure accumulator clamped, with an aperture hole in the bulk wall is provided, the damped pressure equalization between the common rail accumulator and the space between the mass wall and the membrane allows.
  • a low pass filter would correspond to the mass wall the inductance, the orifice hole the ohmic resistance and the membrane a capacitor.
  • An embodiment of the is also very particularly preferred Fuel injection system according to the invention, in which a additional common rail pressure accumulator to accommodate under Pressurized additional liquid is provided, which via a 2/2-way valve with the one leading to the two-component nozzle Auxiliary liquid line is connected and similar advantages has like the known common rail pressure accumulator for fuel.
  • a further common rail pressure accumulator of the above described delivery mechanism for the additional liquid considerably simplify by placing the diaphragm over a check valve directly and without interposing a pump piston driving lever mechanism by passing on corresponding Pressure surges on the other common rail pressure accumulators cause the pumping of additional liquid.
  • a particular advantage of using another common rail pressure accumulator for additional liquid is that the 2/2-way valve in the additional liquid line can supply whole group of injectors, whereby only It must be ensured that there is no overlap in time the metering processes for the individual injectors occur.
  • 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.
  • 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.
  • the second embodiment shown in FIG distinguishes fuel injection system according to the invention differs from that shown in Fig. 1 by a modification of the responsible for the pumping of the additional liquid Part of the facility.
  • a membrane 21.1 by means of a Mass wall 21.2 at one end of the common rail pressure accumulator 20 articulated, the mass wall 21.2 due to a slightly conical outer contour of the membrane 21.1 pressure-tight a high-pressure chamber 20.1 of the common rail pressure accumulator 20 clamps.
  • an aperture hole 21.3 provided by the fuel from the high pressure chamber 20.1 in a space 21.4, the membrane 21.1 and the Mass wall 21.2 is enclosed, depending on the pressure drop direction can penetrate or emerge from this.
  • a lever mechanism 22 is on the one hand with the space 21.4 opposite side of the membrane 21.1, on the other hand with a Pump piston 23.1 connected.
  • the lever mechanism 22 on a longitudinally movable slide 24.1 rotatably mounted. From pressure fluctuations in the high pressure room 20.1 due to jerky withdrawal of the injection quantity Fuel results in a movement of the membrane 21.1. By the diaphragm path becomes a reciprocating movement of the lever mechanism 22 causes, which in turn a corresponding Stroke of the pump piston 23.1 results.
  • the pump piston 23.1 is preloaded accordingly via a compression spring 23.2, so that there are no "lots" in any movement phase can arise.
  • the pump piston 23.1 sucks through a Line 29 supported with a check valve 27 by a pre-feed pump 20 a corresponding amount of additional liquid from a tank 25 Amount of water via the additional liquid line 15 and that Check valve 3.4 pushed into the two-fluid nozzle 3, if the second 2/2-way valve MV2 for directing the amount of water by a command of the not shown in the drawing Engine management was opened.
  • the slide 24.1 by an electric motor 24.3 which is a screwed into the slider 24.1 24.2 carries, according to a turning command from the engine management moved up or down.
  • the pump device can either from one injection to the other in the same injector Measure 3 different amounts of additional liquid or further connected to the additional liquid line 15 Injectors (indicated by a number in the drawing parallel arrows) can be customized with that for them respectively correct amount of additional liquid.
  • the current stroke of the pump piston can also be used 23.1 measured and with other important, currently available Data and the current change request compared and be offset to make an adjustment as quickly as possible new conditions (e.g. changing the accelerator pedal position by the driver of a motor-driven vehicle) to be able to.
  • Nervous reactions of membrane 21.1 caused by pressure peaks or other smaller pressure fluctuations with higher frequencies caused in the high pressure room 20.1 and one exact metering of the required additional liquid is detrimental are dimensioned appropriately and matching the mass wall 21.2 with the orifice bore 21.3 and the spring behavior of the membrane 21.1 damped.
  • a behavior that is hydraulic Low pass equals with the mass wall 21.2 in electrical analogue of an inductance, the aperture bore 21.3 an ohmic resistance and the membrane 21.1 one Capacitor corresponds.
  • a hydraulic low-pass filter also has an advantageous effect on the pressure conditions in the high pressure chamber 21.1 because this also dampens pressure fluctuations takes place.
  • FIG. 3 differs 2 essentially by the fact that for water supply the two-fluid nozzle 3 now another common rail pressure accumulator 32 to accommodate pressurized Additional liquid is provided via a further 2/2-way valve MV3 with the additional liquid line leading to the two-substance nozzle 3 15 and via a check valve 31 with the delivery side of the diaphragm driven pump piston 23.1 is connected.
  • the other can 2/2-way valve MV3 identical in construction to the first 2/2-way valve MV1 can be designed, whereby the 2/2-way valve MV3, however suitable for operation with the additional liquid have to be.
  • the further 2/2-way valve MV3 can supply entire group of two-substance nozzles 3, as long as none temporal overlaps of the metering processes for the different Injectors. In which injector each measured amount of additional liquid should go off, again determines a simply constructed second 2/2-way valve MV2, however, for every two-component nozzle in the group must be present.
  • a further pressure holding valve 43 is provided in the discharge line 8, which connects the second 2/2-way valve MV2 to the low-pressure fuel side.
  • Leakage line 35 attached to the reservoir 25 opens.
  • the delivery of the additional liquid from the additional container 25 is done via a check valve 34.
  • the fluid delivery can also be one in the drawing Pump not shown may be provided.
  • FIG. 4 shows a further development of the embodiment 3, in which on a lever mechanism 22 and an adjustment facial expression was dispensed with.
  • the promotion and metering is here directly from the to the high pressure room 40.1 of the common rail pressure accumulator 40 for fuel Membrane 41.1, which with appropriate Overpressure in the high pressure chamber 40.1 with a pressure surge Provides additional liquid charged space 43, which on the Check valve 31 in the other common rail pressure accumulator 42 is passed on.
  • the other functions are complete analogous to those of the exemplary embodiment according to FIG. 3.

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  • 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)
EP98954191A 1997-10-22 1998-09-18 Kraftstoffeinspritzanlage für eine brennkraftmaschine Expired - Lifetime EP0946830B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19746492 1997-10-22
DE19746492A DE19746492A1 (de) 1997-10-22 1997-10-22 Kraftstoffeinspritzanlage für eine Brennkraftmaschine
PCT/DE1998/002771 WO1999020893A1 (de) 1997-10-22 1998-09-18 Kraftstoffeinspritzanlage für eine brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP0946830A1 EP0946830A1 (de) 1999-10-06
EP0946830B1 true EP0946830B1 (de) 2003-11-26

Family

ID=7846178

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98954191A Expired - Lifetime EP0946830B1 (de) 1997-10-22 1998-09-18 Kraftstoffeinspritzanlage für eine brennkraftmaschine

Country Status (7)

Country Link
US (1) US6067964A (ja)
EP (1) EP0946830B1 (ja)
JP (1) JP2001507101A (ja)
KR (1) KR20000069569A (ja)
CN (1) CN1109193C (ja)
DE (2) DE19746492A1 (ja)
WO (1) WO1999020893A1 (ja)

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US10202929B1 (en) 2014-09-22 2019-02-12 National Technology & Engineering Solutions Of Sandia, Llc Additive-mixing fuel-injection system for internal combustion engines
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RU2711793C2 (ru) 2015-11-20 2020-01-23 ЭмСиЁРС ХОЛДИНГС ЛТД Двигатель внутреннего сгорания с послойным распределением топливной смеси
CN109386420B (zh) * 2018-10-15 2021-02-02 哈尔滨工程大学 多次喷射燃油喷射规律测量方法
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Also Published As

Publication number Publication date
CN1242822A (zh) 2000-01-26
EP0946830A1 (de) 1999-10-06
JP2001507101A (ja) 2001-05-29
WO1999020893A1 (de) 1999-04-29
DE59810274D1 (de) 2004-01-08
DE19746492A1 (de) 1999-04-29
US6067964A (en) 2000-05-30
KR20000069569A (ko) 2000-11-25
CN1109193C (zh) 2003-05-21

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