EP1574701A1 - Common-Rail Injektor - Google Patents

Common-Rail Injektor Download PDF

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Publication number
EP1574701A1
EP1574701A1 EP05100202A EP05100202A EP1574701A1 EP 1574701 A1 EP1574701 A1 EP 1574701A1 EP 05100202 A EP05100202 A EP 05100202A EP 05100202 A EP05100202 A EP 05100202A EP 1574701 A1 EP1574701 A1 EP 1574701A1
Authority
EP
European Patent Office
Prior art keywords
rail injector
common rail
injection
injector
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.)
Withdrawn
Application number
EP05100202A
Other languages
German (de)
English (en)
French (fr)
Inventor
Ralf Maier
Stefan Haug
Juergen Keinath
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 EP1574701A1 publication Critical patent/EP1574701A1/de
Withdrawn legal-status Critical Current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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/12—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship providing a continuous cyclic delivery with variable 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
    • F02M47/02—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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0036—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat with spherical or partly spherical shaped valve member ends
    • 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
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/304—Fuel-injection apparatus having mechanical parts, the movement of which is damped using hydraulic 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/161—Means for adjusting injection-valve lift
    • 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
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • 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
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0043—Two-way valves

Definitions

  • the invention relates to a common rail injector for a fuel injection system an internal combustion engine, with an injector, with a in the injector by a piston guide guided valve piston, with an injection nozzle needle is in operative connection, and a control chamber volume, which through the valve piston is limited, and a drain channel and at least one inlet channel.
  • Such common rail injectors are known from DE 199 36 668 A1.
  • a high-pressure pump delivers the fuel into the central high-pressure accumulator (Common rail).
  • High pressure accumulator high pressure lines lead to the individual injectors, which are assigned to the engine cylinders.
  • the injectors will be individually controlled by the engine electronics.
  • the rail pressure is in the pressure chamber and on the control valve. When the control valve opens, gets high pressure acted upon fuel at the lifted against the biasing force of the nozzle spring Nozzle needle passing in the combustion chamber.
  • the control room is here from one Sleeve limited, the sealing effect at the combustion chamber remote end of the nozzle needle is displaceable and with the help of the nozzle spring in contact with the injector is held.
  • a disadvantage of the common-rail injectors described above is that these either in the low volume range, a plateau in the characteristic curve, or, if so is not the case, over the entire tonnage range, especially in the Applied full load amount have a full ballistic history.
  • a common rail injector for a fuel injection system of an internal combustion engine which is an injector housing, a valve piston guided in the injector housing by a piston guide, which is in operative connection with an injection nozzle needle, and a control chamber volume, which is bounded by the valve piston, and a drain channel and Has at least one inlet channel, in the open state, the stroke of the valve piston on, the combustion chamber facing away from the end of the valve piston by a stroke stop is limited in the region of the drainage channel. This will be a limit the injection quantity, especially in the full load range, which in particular benefits in terms of quantity dispersion.
  • valve piston may be one opposite the diameter the valve piston tapered piston tip, in the open state stops the stroke stop.
  • the Piston tip at the end of a conical surface creating a better flow around is possible.
  • Such a valve piston can be made simply and very precisely as a turned part. Additional milling operations can be omitted.
  • the drainage channel has a throttle at which in the Area of the confluence into the control room volume separated by a paragraph followed by the diameter-expanded section.
  • the diameter of the extended Section is smaller than the diameter of the piston tip, causing the stroke stop is trained.
  • a valve seat In conjunction with the conical surface of the piston tip is reached a valve seat.
  • the stroke stop of the drainage channel at the transition of the extended section to the control room volume a conical surface which prevents sharp transitions in this area particularly positive on the outflow behavior of the fuel, especially in terms Material load and noise reduction effect.
  • the hub of the valve piston by the distance between the stroke stop and the conical surface be defined, whereby a narrow tolerance field is made possible.
  • the conical surface of the piston tip and the conical surface of the drainage channel can in preferred embodiment be designed such that in the direction of the throttle an acute tapered space is included.
  • a liquid cushion be formed, resulting in a quasi-mechanical stroke stop.
  • This results in a maximum valve lift which, depending on the geometry of the Control chamber volume, the map injection quantity vs. Injection time depending the injection pressure determined. To this is achieved by this embodiment, that the valve piston is centered with its piston tip.
  • a common rail injector having at least one of the above features has a characteristic curve injection quantity vs. Injection time for the total pressure range, which is largely in the range of the smallest quantities plateauless, steadily increasing course has. This can be in the smallest amount achieved as a result of the linear course of the characteristic zero-quantity calibration What, for example, in connection with a fast-opening 2-piece Armature assembly and a coordinated control room volume allows becomes.
  • the common rail injector also has a, im Range of large injection quantities (full load operation) compared to average injection quantities (Partial load operation) flattened characteristic curve injection quantity vs. Injection time on what quantity discrepancies in the injected quantity in the range of large quantities reduced at full load.
  • Fig. 1 shows schematically a section of a common rail injector 1 for a Fuel injection system of an internal combustion engine.
  • the common-rail injector points an injector housing 10, with a in the injector 10 by a piston guide 60 guided valve piston 30, which in the lower area with a not shown here Injection nozzle needle 31 is in operative connection, which is an injection valve for Combustion chamber closes.
  • a control chamber volume 40 limited, which has at least one inlet channel 61.
  • valve ball 50 Above the drainage channel 20, this is closed by a valve ball 50. Above the valve ball 50 are not visible here, a magnet with an armature assembly, especially in 2-part design, arranged by spring force the valve ball 50 acts and presses it against a tapered sealing surface. By driving the magnet, the armature is raised so that the valve ball 50 an outflow cross section on the drain passage 20 releases, by the control room volume 40 can drain a certain amount of fuel. The pressure in the control room 40 thereby drops, so that the valve piston 30 is due to the imbalance in the forces acting on the valve piston 30 upwards in the direction Flow channel 20 can move. The injection nozzle needle 31 thus opens the injection valve and injects a certain amount of fuel into the combustion chamber. This Operation describes the basic function of the common-rail injector 1 as it comes from State of the art is known.
  • the stroke of the valve piston 30 on, the combustion chamber remote from the end of the valve piston 30 through a stroke stop 24 is limited in the region of the discharge channel 20.
  • the valve piston 30 a with respect to the diameter the valve piston 30 tapered piston tip 32, which in the open state stops the stroke stop 24.
  • the piston tip 32 has at its end a Cone surface 33.
  • the outlet channel 20 has a throttle 21, at which in the region of the junction in the control room volume 40 by a paragraph 22 separated in diameter extended section connects.
  • the diameter of the extended section is smaller than the diameter of the piston tip 32, causing the stroke stop 24 trains.
  • FIG Stroke stop 24 at the outlet channel 20 at the transition of the extended section to Control chamber volume 40 a conical surface 23 in the manner that the conical surface 33rd the piston tip 32 and the conical surface 23 of the flow channel 20 in a direction the throttle 21 includes an acute-angled gap.
  • Fig. 2 shows the details described above schematically in an enlarged Presentation.
  • Fig. 3 shows a typical characteristic curve injection quantity vs. Injection time according to the prior art. These are in the range of the smallest quantities Plateau up, which means that in this area is not a linear relationship between injection time and resulting injection quantity is what a Zero quantity calibration is difficult.
  • Common Rail injectors 1 first an area stronger slope between injection quantity and injection time. This ballistic said area then buckles and goes into a non-ballistic, flatter course above.
  • characteristic curves which in the smallest quantity range no plateaus but at larger injection rates throughout the work area, and so that even with the applied full load quantity a ballistic course with the in Have described prior art disadvantages.
  • FIG. 4 shows the characteristic curve injection quantity vs. Injection time at one Common rail injector 1 according to the preferred embodiment, which in Fig. 1 and 2 has been described.
  • Characteristic here is that the characteristic curve injection quantity vs.. Injection time for the entire pressure range in the range of the smallest quantities a largely plateauless, steadily increasing course has.
  • In the area of large injection quantities (Full load operation) have the characteristics one over average injection quantities (Partial load operation) flattened course (non-ballistic).
  • Ballistic In between run the characteristics, depending on the injection pressure, ballistic. This comes about because in This range of the characteristic not only the pressure increase in the fuel, but also over the injection time larger injection cross sections occur.
  • the location of the "Kinking range" in the characteristic curve at the transition from the ballistic into the not Ballistic area is in particular by the valve lift 41 of the valve piston 30th established.
  • the quasi mechanical stroke stop 24 is characterized by a hydraulic Cushion formed, which from the outflowing fuel between the Cone surfaces 23, 33 of the drain channel 20 and the piston tip 32 results. This Upholstery has a very small thickness close to zero.

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)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)
EP05100202A 2004-03-05 2005-01-14 Common-Rail Injektor Withdrawn EP1574701A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410010759 DE102004010759A1 (de) 2004-03-05 2004-03-05 Common-Rail Injektor
DE102004010759 2004-03-05

Publications (1)

Publication Number Publication Date
EP1574701A1 true EP1574701A1 (de) 2005-09-14

Family

ID=34813604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05100202A Withdrawn EP1574701A1 (de) 2004-03-05 2005-01-14 Common-Rail Injektor

Country Status (3)

Country Link
EP (1) EP1574701A1 (zh)
CN (1) CN1664349A (zh)
DE (1) DE102004010759A1 (zh)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007077064A1 (de) * 2005-12-30 2007-07-12 Robert Bosch Gmbh Brennstoffeinspritzventil
CN102374084A (zh) * 2011-09-20 2012-03-14 福建省莆田市中涵机动力有限公司 静态无泄漏的高压共轨喷油器
CN113250878A (zh) * 2021-06-18 2021-08-13 中国北方发动机研究所(天津) 一种共轨喷油器控制柱塞部件

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006021736A1 (de) * 2006-05-10 2007-11-15 Robert Bosch Gmbh Kraftstoffinjektor mit druckausgeglichenem Steuerventil
DE102013204103A1 (de) * 2013-03-11 2014-09-11 Robert Bosch Gmbh Verfahren zum Ansteuern eines Einspritzventils
CN110529316B (zh) * 2019-08-22 2020-11-03 一汽解放汽车有限公司 一种燃料喷射阀及发动机

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0548916A1 (en) * 1991-12-24 1993-06-30 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Electromagnetic fuel injection valve
US5522545A (en) * 1995-01-25 1996-06-04 Caterpillar Inc. Hydraulically actuated fuel injector
EP0753659A1 (en) * 1995-07-14 1997-01-15 Isuzu Motors Limited Fuel injection device for internal combustion engines
EP0916842A1 (en) * 1997-11-18 1999-05-19 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Device for controlling an internal combustion engine fuel injector
EP1318294A1 (de) * 2001-12-07 2003-06-11 Robert Bosch Gmbh Injektor, insbesondere für Common-Rail-Einspritzsysteme von Dieselmotoren
WO2003054375A1 (de) * 2001-12-07 2003-07-03 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine brennkraftmaschine
DE10164393A1 (de) * 2001-12-28 2003-07-17 Bosch Gmbh Robert Kraftstoffeinspritzventil für eine Brennkraftmaschine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0548916A1 (en) * 1991-12-24 1993-06-30 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Electromagnetic fuel injection valve
US5522545A (en) * 1995-01-25 1996-06-04 Caterpillar Inc. Hydraulically actuated fuel injector
EP0753659A1 (en) * 1995-07-14 1997-01-15 Isuzu Motors Limited Fuel injection device for internal combustion engines
EP0916842A1 (en) * 1997-11-18 1999-05-19 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Device for controlling an internal combustion engine fuel injector
EP1318294A1 (de) * 2001-12-07 2003-06-11 Robert Bosch Gmbh Injektor, insbesondere für Common-Rail-Einspritzsysteme von Dieselmotoren
WO2003054375A1 (de) * 2001-12-07 2003-07-03 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine brennkraftmaschine
DE10164393A1 (de) * 2001-12-28 2003-07-17 Bosch Gmbh Robert Kraftstoffeinspritzventil für eine Brennkraftmaschine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007077064A1 (de) * 2005-12-30 2007-07-12 Robert Bosch Gmbh Brennstoffeinspritzventil
CN102374084A (zh) * 2011-09-20 2012-03-14 福建省莆田市中涵机动力有限公司 静态无泄漏的高压共轨喷油器
CN102374084B (zh) * 2011-09-20 2012-12-05 福建省莆田市中涵机动力有限公司 静态无泄漏的高压共轨喷油器
CN113250878A (zh) * 2021-06-18 2021-08-13 中国北方发动机研究所(天津) 一种共轨喷油器控制柱塞部件

Also Published As

Publication number Publication date
CN1664349A (zh) 2005-09-07
DE102004010759A1 (de) 2005-09-22

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