EP1682769B1 - Kraftstoffinjektor mit mehrteiligem, direktgesteuertem einspritzventilglied - Google Patents

Kraftstoffinjektor mit mehrteiligem, direktgesteuertem einspritzventilglied Download PDF

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Publication number
EP1682769B1
EP1682769B1 EP04786717A EP04786717A EP1682769B1 EP 1682769 B1 EP1682769 B1 EP 1682769B1 EP 04786717 A EP04786717 A EP 04786717A EP 04786717 A EP04786717 A EP 04786717A EP 1682769 B1 EP1682769 B1 EP 1682769B1
Authority
EP
European Patent Office
Prior art keywords
injection valve
fuel injector
valve member
needle part
chamber
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.)
Not-in-force
Application number
EP04786717A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1682769A1 (de
Inventor
Friedrich Boecking
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 EP1682769A1 publication Critical patent/EP1682769A1/de
Application granted granted Critical
Publication of EP1682769B1 publication Critical patent/EP1682769B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • 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
    • F02M45/08—Injectors peculiar thereto
    • F02M45/086—Having more than one injection-valve controlling discharge orifices
    • 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
    • F02M2200/21—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
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic

Definitions

  • Verbrennungsltraftmaschinen storage injection systems are used for fuel injection, which allow a speed and load-independent adjustment of the injection pressure.
  • Conunon-Rail are pressure generation and injection and locally decoupled.
  • the injection pressure is generated by a separate high-pressure pump. This does not have to be driven synchronously with the injections.
  • the pressure can be adjusted independently of the engine speed and the injection quantity.
  • electrically actuated injectors with their An horrzeittician and An Kunststoffdauer the start of injection and the injection quantities are determined in the combustion chambers of the internal combustion engine.
  • common-rail injection systems there is a high degree of freedom with regard to the design and formation of multiple or split injection processes.
  • Out DE-190 55 271 A1 is a pressure / stroke controlled injector with hydraulic translator known.
  • 2/2-way control valves are included, the vertical movement is mechanically coupled via a bridge to each other.
  • the 2/2-way control valves are arranged on the inlet side and on the outlet side and upstream of a hydraulic booster.
  • the hydraulic booster pressurizes a pressure chamber surrounding a nozzle needle with high pressure fuel.
  • the two 2/2-way control valves are housed opposite to each other in the injector of the fuel injector.
  • a disadvantage of the DE 190 55 271 A1 known solution is the large number of items that are required to implement a pressure / stroke controlled Injektoran horrung according to this solution.
  • a valve for controlling fluids comprises a valve member axially displaceable in a bore of a valve body. This has a valve closing member forming the valve head, which cooperates with a provided on the valve body seat for opening and closing the valve. Furthermore, a piezoelectric unit for actuating the valve member and a tolerance compensation element to compensate for elongation tolerances of the piezoelectric unit and / or other valve components is provided.
  • the piezoelectric unit is arranged essentially at right angles to the axial movement direction of the valve member and can be acted upon by an electric current such that the piezoelectric unit exerts a tilting movement on an actuator serving as a lever arm, which is operatively connected to the valve member.
  • the proposed solution according to the invention is characterized in that different injection cross-sections in the combustion chamber of a self-igniting internal combustion engine can be released with a multi-part, needle-shaped injection valve member, wherein the multi-part injection valve member is in particular controlled directly.
  • a hydraulic transmission arrangement is provided between a piezoelectric actuator and the multi-part, needle-shaped injection valve member, which has two booster chambers.
  • Each of the two translator chambers acts on a control chamber for controlling an inner needle part and for driving an outer needle part of the multi-part, needle-shaped injection valve member.
  • the inner and the outer needle part of the multipart injection valve member have pressure stages which allow for pressurization of a nozzle chamber in the nozzle body and pressure relief of the control chambers a time-delayed opening of the needle parts of the multi-part injection valve member.
  • the hydraulic forces acting on the outer needle part can be adjusted such that the smallest quantity capability of the fuel injector is ensured even at very low pressures. Due to the formation of two pressure stages on the outer needle part of the multi-part injection valve member this opens very early, whereas the inner needle part of the multi-part injection valve member opens later, since the pressure formed at this stage is designed to be very small. Due to this design of the two pressure levels on the outer needle part and the pressure level on the inner needle part can be achieved that the two needle parts of the multi-part, needle-shaped injection valve member can be switched to different pressure levels.
  • the single FIGURE shows a section through the present invention proposed fuel injector with multi-part trained, needle-shaped injection valve member and a hydraulic transmission arrangement on the booster chambers control spaces which are respectively associated with the inner and the outer needle portion of the multipart injection valve, pressure relieving or druckbeaufschlagbar.
  • the fuel injector 1 shown in the drawing comprises an injector body 2 and a nozzle body 3.
  • the injector body 2 and the nozzle body 3 are in the assembled state at a butt joint 4 to each other.
  • the fuel flows through a high-pressure accumulator injection system, not shown in the drawing (common rail), to the injector body 2 via a fuel inlet 5.
  • an actuator 6 is accommodated, to which a hydraulic transmission device 9 is assigned.
  • a high-pressure feed line 7 branches off in the injector body 2, via which the high-pressure fuel flowing to the injector body 2 flows into a nozzle chamber 8.
  • the nozzle chamber 8 is located in the nozzle body 3 and encloses a multi-part injection valve member 21, which is movably received in the nozzle body 3 in the vertical direction.
  • the hydraulic transmission device 9 comprises a booster piston 10.
  • the booster piston 10 has a first end face 11, which is opposite to the actuator 6.
  • a second end face 12 of the booster piston 10 defines a first booster chamber 13 of the hydraulic transmission device 9.
  • On the booster piston 10 is a booster piston extension 14, which is formed in a smaller diameter compared to the diameter of the booster piston 10.
  • An end face 15 of the translator piston extension 14 projects into a second translator chamber 17. From the second booster chamber 17 from a channel 16 which opens into a first control chamber 19 extends. Parallel to the channel 16 extends an overflow 18, via which the first booster chamber 13 and a second control chamber 20 communicate with each other hydraulically.
  • the multi-part needle-shaped injection valve member 21 has an outer needle part 22 and an inner needle part 23 arranged movably in this needle part.
  • the inner needle part 23 is acted upon by the first control chamber 19, which is in communication with the second booster chamber 17 of the hydraulic transmission arrangement, while the outer needle part 22 via the second control chamber 20 which communicates via the overflow 18 with the first booster chamber 13, is pressed.
  • the outer needle part 22 has a second control chamber 20 limiting control-space-side end face 24 and a first pressure step 25 on the outside and a further, second pressure step 26, which is formed on the inside of the outer needle member 22.
  • a pressure chamber 29 is formed, which is bounded by an annular part 27 formed on the inner needle part 23.
  • a seat 31 is formed on the outer circumference, which has a first seat diameter 32.
  • the seat edge formed in the first seat diameter 32 interacts with the wall of the nozzle body 3.
  • the seat diameter of the seat 33 of the inner needle member 23 is formed in a second seat diameter 34 (d 1 ) which is considerably smaller than the first seat diameter 32 of the outer needle member 22.
  • first injection ports 35 are separated by the closed seat 31 of the outer needle member 22 of an annular gap 41, in which over the nozzle chamber 8 is under high pressure fuel.
  • second injection openings 36 are likewise closed against the fuel which is present in the annular gap 41 and is under high pressure.
  • closed state of the multi-part needle-shaped injection valve member 21, 23 forms a wedge-shaped annular space 42 between the seat 31 of the outer needle member 22 and the seat 33 of the inner needle member.
  • the combustion chamber in which fuel is injected either via the first injection openings 35 or via the opened first and second injection openings 35, 36 when the multi-part injection valve member 21 is open, is identified by reference number 43.
  • the outer needle part 22 of the multi-part, needle-shaped injection valve member 21 is received in a guide length 37 in the nozzle body 3, while the inner needle member 23 in a guide length 38 extending between the Druckraumzuidentn 30 of the outer needle member 23 and its seat 31 in this body 3 , is limited.
  • the outer needle member 22 may be performed in the nozzle body 3 in a plurality of, for example, 120 ° offset from each other formed guide surfaces.
  • the inner needle part 23 of the multi-part, needle-shaped injection valve member 21 has a second diameter 39 (d 2 ) in the region above the inner pressure chamber 29, which exceeds the second seat diameter 34 (d 1 ), ie d 2 > d 1 .
  • the actuator 6 In the closed state of the multi-part injection valve member 21 shown in the drawing, the actuator 6 is energized and extended. Due to the energization of the actuator 6, which is preferably designed as a piezoelectric actuator, its piezocrystals length, which are arranged one above the other in the form of a stack and thus act on the booster piston 10. Its second end face 12 moves into the first booster room 13 a. By the second end face 12 of the booster piston 10 and the booster piston extension 14 is retracted into the second booster chamber 17 of the hydraulic booster assembly 9. The first booster chamber 13 and the second booster chamber 17 are filled via the guide leaks between the outer needle part 22 and the nozzle body 3, the guide leak between the inner needle part 23 and the injector body 2 and the guide leakage between the booster piston 10 and the fuel inlet 5.
  • the booster piston 10 including the translator piston extension 14 moves in the vertical direction upwards.
  • the stroke of the booster piston 10 and the booster piston extension 14 is in the range between 40 and 160 .mu.m.
  • the outer needle part 22 opens sooner, since at this an outer first pressure stage 25 and an inner second pressure stage 26 are formed above the inner pressure chamber 29.
  • the annular space 42 comes into communication with the annular gap 41, in which high-pressure fuel is present.
  • the high-pressure fuel can be injected into the combustion chamber 43 via the first injection openings 35 during a first phase of the injection process.
  • the inner needle portion 23 of the multipart, needle-shaped injection valve member 21 remains in its closed position, d. H. the seat 33 of the inner needle part 23 remains closed.
  • the inner needle part 23 of the multi-part injection valve member 21 opens, since the pressure stage 28 formed thereon is very small.
  • high-pressure fuel flows into the inner pressure space 29 between the outer needle part 22 and the inner needle part 23 via the pressure chamber inlets 30.
  • the fuel flowing into the interior pressure chamber 29 is in contact with the annular surface 27 of the inner needle part 23 and continues to act on it in the closing direction.
  • the annular gap 41 enters the annular space 42 in connection.
  • an effective in the opening direction hydraulic force at the pressure stage 28 at the combustion chamber end of the inner needle member 23 is effective, which moves this in the opening direction.
  • the second seat 33 of the inner needle part 23 is also opened and fuel flows via the now opened second seat 33 to the second injection openings 36.
  • the diameter of the inner needle part 23, i. the first diameter 39 is in the range between 1.5 and 2.5 mm, while the diameter of the second control chamber 20 may be between 3.5 and 5.6 mm, depending on the design of the fuel injector.

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)
EP04786717A 2003-10-18 2004-09-06 Kraftstoffinjektor mit mehrteiligem, direktgesteuertem einspritzventilglied Not-in-force EP1682769B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10348925A DE10348925A1 (de) 2003-10-18 2003-10-18 Kraftstoffinjektor mit mehrteiligem, direktgesteuertem Einspritzventilglied
PCT/DE2004/001995 WO2005040595A1 (de) 2003-10-18 2004-09-06 Kraftstoffinjektor mit mehrteiligem, direktgesteuertem einspritzventilglied

Publications (2)

Publication Number Publication Date
EP1682769A1 EP1682769A1 (de) 2006-07-26
EP1682769B1 true EP1682769B1 (de) 2007-09-05

Family

ID=34428498

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04786717A Not-in-force EP1682769B1 (de) 2003-10-18 2004-09-06 Kraftstoffinjektor mit mehrteiligem, direktgesteuertem einspritzventilglied

Country Status (7)

Country Link
US (1) US20070204837A1 (ja)
EP (1) EP1682769B1 (ja)
JP (1) JP4273153B2 (ja)
KR (1) KR20060096049A (ja)
AT (1) ATE372457T1 (ja)
DE (2) DE10348925A1 (ja)
WO (1) WO2005040595A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107940798A (zh) * 2017-11-24 2018-04-20 山东理工大学 多工况分段组合式喷射器转换总成及在线自动转换装置

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004055267A1 (de) * 2004-11-17 2006-05-18 Robert Bosch Gmbh Kraftstoffeinspitzvorrichtung
DE102004057246A1 (de) * 2004-11-26 2006-06-01 Robert Bosch Gmbh Kraftstoffeinspritzdüse
DE102005037954A1 (de) * 2005-08-11 2007-02-15 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102005054361A1 (de) * 2005-11-15 2007-05-24 Fev Motorentechnik Gmbh Hochdruckkraftstoffinjektor
DE102006012078A1 (de) * 2005-11-15 2007-05-16 Bosch Gmbh Robert Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine mit Kraftstoff-Direkteinspritzung
JP4591555B2 (ja) * 2008-06-12 2010-12-01 株式会社日本自動車部品総合研究所 燃料噴射ノズルおよびそれを用いた燃料噴射制御装置
DE102009002621A1 (de) * 2009-04-24 2010-10-28 Robert Bosch Gmbh Kraftstoffinjektor
DE102012222633A1 (de) * 2012-12-10 2014-06-12 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102014215450B4 (de) * 2014-08-05 2016-03-31 Engineering Center Steyr Gmbh & Co. Kg Fluid-Einspritzvorrichtung

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US3501099A (en) * 1967-09-27 1970-03-17 Physics Int Co Electromechanical actuator having an active element of electroexpansive material
DE2758057A1 (de) * 1977-12-24 1979-06-28 Daimler Benz Ag Doppelnadel-einspritzventil
JPS6029675Y2 (ja) * 1980-06-12 1985-09-06 株式会社小松製作所 燃料噴射装置
DE3824467A1 (de) * 1988-07-19 1990-01-25 Man B & W Diesel Ag Einspritzventil
US4899714A (en) * 1988-10-12 1990-02-13 Ford Motor Company Air/gas forced fuel injection system
US6257499B1 (en) * 1994-06-06 2001-07-10 Oded E. Sturman High speed fuel injector
DE10010863A1 (de) * 2000-03-06 2001-09-27 Bosch Gmbh Robert Einspritzdüse
JP4221913B2 (ja) * 2001-04-26 2009-02-12 トヨタ自動車株式会社 燃料噴射装置
US6705543B2 (en) * 2001-08-22 2004-03-16 Cummins Inc. Variable pressure fuel injection system with dual flow rate injector
DE10205970A1 (de) * 2002-02-14 2003-09-04 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10210927A1 (de) * 2002-03-13 2003-10-02 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
JP4187109B2 (ja) * 2004-09-27 2008-11-26 本田技研工業株式会社 空気・燃料混合気噴射式内燃機関

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None *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107940798A (zh) * 2017-11-24 2018-04-20 山东理工大学 多工况分段组合式喷射器转换总成及在线自动转换装置

Also Published As

Publication number Publication date
WO2005040595A1 (de) 2005-05-06
KR20060096049A (ko) 2006-09-05
EP1682769A1 (de) 2006-07-26
DE10348925A1 (de) 2005-05-12
US20070204837A1 (en) 2007-09-06
JP2007508487A (ja) 2007-04-05
ATE372457T1 (de) 2007-09-15
DE502004004907D1 (de) 2007-10-18
JP4273153B2 (ja) 2009-06-03

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