EP1456528B1 - Kraftstoffeinspritzeinrichtung für eine brennkraftmaschine - Google Patents

Kraftstoffeinspritzeinrichtung für eine brennkraftmaschine Download PDF

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Publication number
EP1456528B1
EP1456528B1 EP02792588A EP02792588A EP1456528B1 EP 1456528 B1 EP1456528 B1 EP 1456528B1 EP 02792588 A EP02792588 A EP 02792588A EP 02792588 A EP02792588 A EP 02792588A EP 1456528 B1 EP1456528 B1 EP 1456528B1
Authority
EP
European Patent Office
Prior art keywords
control
injection
valve
fuel
control piston
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
EP02792588A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1456528A1 (de
Inventor
Katja Matz
Uwe Schmidt
Hubert Greif
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 EP1456528A1 publication Critical patent/EP1456528A1/de
Application granted granted Critical
Publication of EP1456528B1 publication Critical patent/EP1456528B1/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
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • 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
    • 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
    • F02M57/023—Injectors structurally combined with fuel-injection pumps characterised by the pump drive mechanical
    • 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
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically

Definitions

  • the invention is based on a Fuel injection device for an internal combustion engine according to the preamble of claim 1.
  • Such a fuel injection device is characterized by the EP 0,987,431 A2.
  • These Fuel injection device has a High-pressure fuel pump and a connected to this Fuel injector for each cylinder of Internal combustion engine.
  • the high-pressure fuel pump points one by the internal combustion engine in a reciprocating motion powered pump piston having a pump working space limited.
  • the fuel injection valve has one with the Pump work space associated pressure room and one Injection valve member, through which at least one Injection opening is controlled and by the in the Pressure chamber prevailing pressure against a closing force in Opening direction for releasing the at least one Injection opening is movable. It is a first electric actuated control valve provided by the one Connection of pump work space with a discharge chamber is controlled.
  • control pressure chamber is over one Throttle connected to the pump working space.
  • control piston which is supported on the injection valve member and by the in the Control pressure chamber prevailing pressure in a closing direction the injection valve member acted upon and.
  • To a Fuel injection becomes the first control valve closed and the second control valve open, so that can build up in the control pressure chamber no high pressure and the Fuel injector can open.
  • the second control valve When the second control valve is open, it flows out of the pump workspace via the control pressure chamber fuel off until the injection valve member has reached its fully open position in the by the Control piston, the flow area from the control pressure chamber to Relief space is completely closed. In the control pressure room then there is the high pressure as in the pump room, but acts this on a smaller face of the control piston than in its injection valve arranged in its closed position. The However, pressurized face of the control piston can not can be arbitrarily reduced so that it is at high pressure in the Control pressure chamber can be difficult, the fuel injector to keep it open.
  • the fuel injection device with the Features according to claim 1 has the advantage that at for fuel injection opened second control valve and thus opened fuel injection valve with the bypass connection reduced flow area from control pressure chamber to Relief space is released, so that both from the Control pressure chamber effluent amount of fuel to be kept low can not be too high, as well as the pressure in the control pressure chamber, so that the fuel injection valve during the Fuel injection can remain safely open.
  • the embodiment according to claim 2 allows easy formation of the bypass connection.
  • the Training according to claim 3 also allows a easy formation of the bypass connection, as well Insensitive to possible pollution is because the Nut is open with the fuel injection valve closed and thus no dirt particles settle in this can.
  • FIG. 1 shows a Fuel injection device for an internal combustion engine in a longitudinal section in a simplified representation
  • Figure 2 a designated in Figure 1 with II section in enlarged view
  • Figure 3 is a further enlarged Section III of Figure 2 with closed Fuel injection valve
  • Figure 4 the neckline III at opened fuel injection valve
  • Figure 5 shows the cutout III of a fuel injection device according to a modified version with closed Fuel injection valve
  • Figure 6 the neckline III at opened fuel injector.
  • the internal combustion engine is preferably a self-igniting internal combustion engine.
  • the Fuel injection device is preferably as So-called pump-nozzle unit is designed and has for each cylinder of the internal combustion engine one each High-pressure fuel pump 10 and connected to this Fuel injection valve 12, which has a common Form building unit.
  • the Fuel injection device as a so-called pump-line-nozzle system be trained in which the High-pressure fuel pump and the fuel injection valve each cylinder is arranged separately from each other and over a line are connected together.
  • the High-pressure fuel pump 10 has a pump body 14 with a cylinder bore 16 in which a pump piston 18th is tightly guided, at least indirectly by a Cam 20 of a camshaft of the internal combustion engine opposite the force of a return spring 19 in a lifting movement is driven.
  • the pump piston 18 limited in the Cylinder bore 16 a pump working chamber 22, in the at Delivery stroke of the pump piston 18 Fuel under high pressure is compressed.
  • the pump working chamber 22 becomes fuel from a fuel tank 24 of the motor vehicle fed.
  • the fuel injection valve 12 has one with the Pump body 14 connected valve body 26, the may be formed in several parts, and in the one Injection valve member 28 in a bore 30th is guided longitudinally displaceable.
  • the valve body 26 indicates its the combustion chamber of the cylinder of the internal combustion engine facing end region at least one, preferably a plurality Injection openings 32.
  • the injection valve member 28 has at its the combustion chamber end facing a For example, about conical sealing surface 34, which with one in the valve body 26 in the combustion chamber facing End region formed valve seat 36 cooperates, from or after which the injection openings 32 dissipate.
  • valve body 26 is between the injection valve member 28 and the bore 30 to the valve seat 36 toward an annular space 38th present, in its the valve seat 36 facing away End region by a radial extension of the bore 30 in a pressure chamber 40 surrounding the injection valve member 28 passes.
  • the injection valve member 28 has the height of the Pressure chamber 40 by a cross-sectional reduction a Pressure shoulder 42 on.
  • a biased Closing spring 44 At the end of the combustion chamber facing away from the Injector member 28 engages a biased Closing spring 44, through which the injection valve member 28th is pressed toward the valve seat 36.
  • the closing spring 44 is arranged in a spring chamber 46 of the valve body 26, the adjoins the bore 30.
  • the bore 48 forms a control pressure chamber 52 through the control piston 50 is limited as a movable wall.
  • the control piston 50 rests on one opposite this in diameter smaller piston rod 51 on the injection valve member 28 and may be connected to the injection valve member 28.
  • the Control piston 50 may be integral with the injection valve member 28 is formed, however, for reasons of assembly preferably as a separate part with the injection valve member 28 connected.
  • Control pressure chamber 52 The connection 64 of Control pressure chamber 52 with the discharge chamber 24 is through controlling a second electrically operated control valve 70, which can be designed as a 2/2-way valve.
  • a throttle point 63 In the Connection 62 of the control pressure chamber 52 with the Pump work chamber 22 is a throttle point 63 is provided.
  • the control valves 68,70 can be an electromagnetic Actuator or a piezoelectric actuator and are by a electronic control device 72 is controlled.
  • an intermediate disc 54 is arranged, which has a boundary the control pressure chamber 52 on the injection valve member 28 side facing away forms.
  • the control pressure chamber 52nd delimiting surface 53 of the washer 54 is at least approximately perpendicular to the longitudinal axis 49 of the control piston 50 arranged.
  • the channel 62 is of the Channel 60 formed to the control pressure chamber 52 and the Throttle 63 is known as a throttle bore in the Washer 54 is formed.
  • the throttle bore 63 opens in an edge region of the control pressure chamber 52 offset from Longitudinal axis 49 of the control piston 50.
  • a bore 55 is arranged, which forms part of Connection 64 of the control pressure chamber 52 to the relief space 24th forms.
  • the control piston 50 indicates its the intermediate disc 54 facing end face a hollow cylindrical projection 56 on which a lesser Diameter than the control piston 50 in which in the bore 48 has sealingly guided area.
  • an annular sealing surface 57 is formed at the Washer 54 facing end face of the projection 56th.
  • the depression 58 is at least approximately coaxial with the bore 55 in the Washer 54 is disposed and has at least approximately the same diameter as the bore 55.
  • the Sealing surface 57 may be at least approximately flat be and perpendicular to the longitudinal axis 49 of the control piston 50th run.
  • the sealing surface 57 is such Beveled trained that this radially inward to Well 58 falls down as in the figures 3 to 6 is shown.
  • the throttle bore 63 in the Washer 54 opens into the control pressure chamber 52 outside of the neck 56 of the control piston 50 in the area the lowering 59.
  • the bore 55 in the washer 54th forms one within the neck 56 of the control piston 50th laxative flow to the second control valve 70 and over this to the relief room 24th
  • the fuel injection device is in hollow cylindrical projection 56 of the control piston 50 a Throttle bore 80 arranged, the lowering 59 outside the approach 56 with the recess 58 within the approach 56 connects.
  • the throttle bore 80 extends, for example approximately radially to the longitudinal axis 49 of the control piston 50 through the Approach 56.
  • the throttle bore 80 in the control piston 50 has a groove 82 in the Sealing surface 57 is formed, for example, approximately radially to the longitudinal axis 49 of the control piston 50 extends and to the Washer 54 is open.
  • the cross section of the groove 82 can be configured as desired and the groove 82 connects the Lowering 59 outside of the projection 56 with the recess 58th within the neck 56 of the spool 50.
  • the cross section of the throttle bore 63 in the washer 54 and the throttle bore 80 and the throttling groove 82 in Control piston 50 are for optimum function of Fuel injection device in a suitable manner coordinated.
  • the second control valve 70 is closed, so that the control pressure chamber 52 separated from the discharge chamber 24 is.
  • the first control valve 68 remains in its closed position. In the control pressure chamber 52 is building while high pressure as in the pump working chamber 22, so that on the control piston 50, a large pressure force in the closing direction acts and the injection valve member 28 in his Closed position is moved.
  • the second Control valve 70 is opened by the control device 72.
  • the Fuel injection valve 12 then opens as a result of reduced pressure force on the control piston 50 and the Injector member 28 moves above its maximum Opening stroke in its open position.
  • the Opening movement of the injection valve member 28 is initially the large flow area over the main connection 84th released by the control piston 50 until the Injector member 28 with its maximum opening stroke is opened and the control piston 50 with its sealing surface 57 abuts the surface 53 of the washer 54 and the Main connection 84 closes and only the Bypass connection via the throttle bore 80 and the Drosselut 82 is released. This will be a quick Opening the fuel injection valve 12 allows.
  • the second Control valve 70 by the controller 72 in his closed switch position brought so that the Control pressure chamber 52 is separated from the discharge chamber 24 and builds up in this high pressure and on the on the Control piston 50 acting force the fuel injector 12 is closed.
  • the Main connection 84 with a large flow area released, so that the pressure in the control pressure chamber 52 quickly rises and on the control piston 50, a high pressure force acts, so that the Kraftstoffeinspriztventil 12 quickly closes.
  • the second control valve 70 by the controller 72nd opened again so that due to the reduced pressure in Control pressure chamber 52, the fuel injection valve 12 opens.
  • the second Control valve 70 closed and / or the first control valve 68 opened.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP02792588A 2001-12-07 2002-11-02 Kraftstoffeinspritzeinrichtung für eine brennkraftmaschine Expired - Lifetime EP1456528B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10160263A DE10160263A1 (de) 2001-12-07 2001-12-07 Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10160263 2001-12-07
PCT/DE2002/004075 WO2003050408A1 (de) 2001-12-07 2002-11-02 Kraftstoffeinspritzeinrichtung für eine brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP1456528A1 EP1456528A1 (de) 2004-09-15
EP1456528B1 true EP1456528B1 (de) 2005-09-14

Family

ID=7708452

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02792588A Expired - Lifetime EP1456528B1 (de) 2001-12-07 2002-11-02 Kraftstoffeinspritzeinrichtung für eine brennkraftmaschine

Country Status (6)

Country Link
US (1) US6976638B2 (ja)
EP (1) EP1456528B1 (ja)
JP (1) JP2005511965A (ja)
DE (2) DE10160263A1 (ja)
HU (1) HUP0401031A2 (ja)
WO (1) WO2003050408A1 (ja)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10211439A1 (de) * 2002-03-15 2003-10-02 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE102004024527A1 (de) * 2004-05-18 2005-12-15 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung
DE102005007543A1 (de) * 2005-02-18 2006-08-24 Robert Bosch Gmbh Kraftstoffinjektor mit direkter Nadelsteuerung für eine Brennkraftmaschine
US20070163243A1 (en) * 2006-01-17 2007-07-19 Arvin Technologies, Inc. Exhaust system with cam-operated valve assembly and associated method
CH704454A1 (de) * 2011-02-08 2012-08-15 Liebherr Machines Bulle Sa Einspritzvorrichtung für ein Fluid.
CN112664655B (zh) * 2019-10-15 2022-09-20 宝山钢铁股份有限公司 一种高可靠性的冷轧机精细冷却喷射阀

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5826562A (en) * 1994-07-29 1998-10-27 Caterpillar Inc. Piston and barrell assembly with stepped top and hydraulically-actuated fuel injector utilizing same
US5860597A (en) * 1997-03-24 1999-01-19 Cummins Engine Company, Inc. Injection rate shaping nozzle assembly for a fuel injector
WO1999034111A1 (de) * 1997-12-23 1999-07-08 Siemens Aktiengesellschaft Einspritzventil mit steuerventil
GB9820237D0 (en) 1998-09-18 1998-11-11 Lucas Ind Plc Fuel injector
DE19937713C1 (de) * 1999-08-10 2001-03-15 Siemens Ag Steuerventilanordnung zum Einsatz in einem Kraftstoffinjektor für Verbrennungsmotoren
DE19939419A1 (de) 1999-08-20 2001-03-01 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung
GB9920352D0 (en) * 1999-08-28 1999-11-03 Lucas Ind Plc Fuel injector
DE19946766C2 (de) 1999-09-29 2001-07-26 Siemens Ag Injektor für eine Brennkraftmaschine mit Direkteinspritzung
DE10015268A1 (de) * 2000-03-28 2001-10-04 Siemens Ag Einspritzventil mit Bypaßdrossel
US6631853B2 (en) * 2001-04-09 2003-10-14 Siemens Diesel Systems Technologies, Llc Oil activated fuel injector control valve
DE10155406A1 (de) * 2001-11-10 2003-05-22 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10158028A1 (de) * 2001-11-27 2003-06-12 Bosch Gmbh Robert Injektor für ein Common-Rail-Kraftstoffeinspritzsystem mit Einspritzverlaufsformung

Also Published As

Publication number Publication date
DE50204298D1 (de) 2005-10-20
JP2005511965A (ja) 2005-04-28
EP1456528A1 (de) 2004-09-15
US6976638B2 (en) 2005-12-20
HUP0401031A2 (en) 2004-08-30
WO2003050408A1 (de) 2003-06-19
DE10160263A1 (de) 2003-06-18
US20040123840A1 (en) 2004-07-01

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