EP1415082A1 - Injecteur de carburant a commande de distributeur a 2 voies - Google Patents

Injecteur de carburant a commande de distributeur a 2 voies

Info

Publication number
EP1415082A1
EP1415082A1 EP02750826A EP02750826A EP1415082A1 EP 1415082 A1 EP1415082 A1 EP 1415082A1 EP 02750826 A EP02750826 A EP 02750826A EP 02750826 A EP02750826 A EP 02750826A EP 1415082 A1 EP1415082 A1 EP 1415082A1
Authority
EP
European Patent Office
Prior art keywords
pressure
switching valve
fuel injector
valve
nozzle
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Withdrawn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
EP02750826A
Other languages
German (de)
English (en)
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 EP1415082A1 publication Critical patent/EP1415082A1/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
    • F02M63/0007—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using electrically actuated valves
    • 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
    • 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • 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
    • F02M63/0059—Arrangements of valve actuators
    • F02M63/0061—Single actuator acting on two or more 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
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift

Definitions

  • the combustion chambers of an internal combustion engine are assigned fuel injectors which are supplied with fuel under high pressure.
  • 3/2-way valves can be used on fuel injectors, which are installed together with a 2/2-way valve. Interconnection of a 3/2-way valve with a 2/2-way valve is common practice, but involves a great deal of effort in terms of coordinating the valves with one another.
  • DE 197 01 879 AI relates to a fuel injection device for internal combustion engines.
  • This comprises a common high-pressure accumulator (common rail) that can be filled with fuel from a high-pressure pump.
  • This is connected via injection lines to injection valves projecting into the combustion chamber of the internal combustion engine to be supplied.
  • Their opening and closing movements are each controlled by an electrically controlled control valve, which is designed as a 3/2-way valve.
  • This connects a high-pressure channel opening at an injection opening of the injection valve to the injection line or a relief line.
  • a hydraulic work space which can be filled with high fuel pressure is provided on the control valve member of the control valve and can be opened in a relief channel for adjusting the setting position of the control valve member of the control valve.
  • the working space of the control valve member is designed as a hydraulic working space that can be filled with high fuel pressure, which acts on the control valve member against an hydraulic opening force acting on it in the closing direction of a flow cross-section between the injection line and the high-pressure channel and which can be opened in a relief chamber.
  • the tax valve member traversed by an oblique throttle bore and constantly acted upon by this under high pressure fuel.
  • the inlet throttle integrated in the control valve member and designed in a smaller throttle cross section is difficult to manufacture in terms of its manufacture and fine machining.
  • DE 197 44 518 AI shows a mass-reduced fuel injection valve for internal combustion engines.
  • This comprises an axially displaceable valve body which is arranged in a valve body and has a conical valve sealing surface at its end facing the combustion chamber of the internal combustion engine, with which it interacts with a conical valve seat surface on the valve body for controlling an injection cross section.
  • the valve member is slidably guided on an internal guide on a pin of a stationary insert body.
  • the opening and stroke movement of the valve body is advantageously limited by mechanical stroke stop surfaces on the pin of a stationary insert body.
  • the control valve opening the control chamber into a relief chamber can be designed as a 2/2-way solenoid valve, but alternatively, 2/3, 3 / 2- or 3/3 control valves can also be used.
  • a stroke / pressure-controlled fuel injector can be implemented which is of simple construction.
  • a forward stroke which is provided between the 2/2-way valves, enables one of the 2/2-way valves, i.e. switch the valve located on the pressure accumulator side without actuating the second 2/2-way valve which releases a leak oil drain.
  • the second 2/2-way valve is only switched to its open position when a pre-stroke has been overcome in the direction of switching of the valve actuator; until then the control chamber of the fuel injector configured according to the invention remains from the low pressure side, i.e. completed the leakage oil drain, the nozzle needle remains in its closed position due to the high pressure level prevailing in the control room.
  • the second 2/2-way valve opens to the leakage oil and the fuel injector is stroke-controlled. If, on the other hand, the two 2/2-way valves are switched directly into their open position by the actuator, the fuel injector works under pressure control. It must be ensured that the design of the throttle elements, which are particularly simple to manufacture, for pressure relief and pressurization of the control chamber of the fuel injector ensures its pressure relief is.
  • the outlet throttle is designed with a larger cross-sectional area and enables a greater fuel flow than the inlet throttle, which is accommodated in an inlet connected to a high-pressure source and controllable by means of the first 2/2-way valve.
  • the sealing spring acting on the nozzle needle in the injector housing releases the opening of the injection nozzle after a pressure p D 0E corresponding to the nozzle opening pressure has been reached .
  • the pressure built up in the nozzle chamber counteracts the closing force of the sealing spring when the opening pressure level is reached.
  • the single figure shows a diagram of an injector body, the control and nozzle space of which can be actuated by two 2/2-way valves which can be actuated by an actuator.
  • FIG. 1 shows the basic sketch of a fuel injector with a nozzle chamber and a control chamber, with two 2/2-way valves that can be actuated by means of an actuator, for example a piezo actuator.
  • a control chamber 2 is provided in an injector body 1 of a fuel injector for injecting fuel into the combustion chamber of a combustion engine.
  • a nozzle needle 3, shown only schematically in the injector body 1, is actuated by this.
  • the control chamber 2 inside the injector body 1 is delimited by a control chamber wall 5 in addition to the end face 4.
  • a relief line 6 with the discharge throttle element 7 contained therein extends from the control chamber 2 to a switching valve 27.
  • the control chamber 2 in the interior of the injector body 1 is supplied with fuel under high pressure via an inlet 8 on the high-pressure side with an inlet throttle element 9 integrated therein.
  • a first switching valve 21 is interposed in the inlet 8 on the high-pressure side, which extends from the control chamber 2 to a high-pressure source 20, shown schematically here. from Inlet 8 on the high-pressure side branches off from a nozzle space inlet 17, via which a nozzle space 15 surrounding the nozzle needle 3 can also be acted upon by fuel under high pressure.
  • the nozzle needle 3 is supported by a spring element 11 in the injector body 1 of the fuel injector.
  • the spring element 11 is supported on the one hand on a stop ring 10 on the injector body 1, while the end of the spring element 11 opposite the stop ring 10 is supported on a shoulder 12 of the nozzle needle 3.
  • the nozzle needle 3 is provided with a pressure shoulder 14 in the area in which it is annularly surrounded by the nozzle space 15.
  • the nozzle needle 3 can be provided with a conically tapering end 16, via which the injection openings (not shown here), which protrude into the combustion chamber of the internal combustion engine, are released or closed depending on the stroke movement of the nozzle needle 3 in the injector body 1.
  • Throttle elements which serve as additional leakage, can each be assigned to the nozzle chamber inlet 17 and the relief line 6 extending to the low-pressure side 19 of the fuel injector.
  • Position 18.1 can be used to assign a throttle element to the nozzle space inlet 17 to represent an additional leak; in an alternative embodiment, this can also be assigned to the relief line 6 in the low-pressure region 19 of the fuel injector in position 18.2.
  • the high-pressure inlet 8 to the control chamber 2 extends from the high-pressure source 20 schematically indicated here, the inlet 8 branching off in front of an inlet throttle element 9 provided therein into a nozzle chamber inlet 17, via which the nozzle needle 3 surrounding the pressure shoulder 14 is surrounded Control chamber 15 is subjected to fuel under high pressure.
  • a first switching valve 21 is provided, which is preferably designed as a 2/2-way valve. The first switching valve 21 can be switched to a closed position 22 and an opening position 23.
  • Reference number 24 identifies the side of the first switching valve 21 which is assigned to the high-pressure source 20 and is preferably designed as a 2/2-way valve.
  • the first switching valve can be actuated via an actuator 26, which can be designed on the one hand as a piezo actuator 26 or on the other hand as a solenoid valve ,
  • the one Control chamber 2 facing side of the other switching valve 27 is identified by reference numeral 31, while that facing the low pressure area of the fuel injector
  • the relief line 6 runs from the latter in the direction of the low-pressure region 19 of the fuel injector in accordance with the schematic representation in FIG. 1.
  • a preliminary stroke 33 is set between the first switching valve 21, which is preferably designed as a 2/2-way valve, and the further switching valve 27.
  • the preliminary stroke 33 denotes the distance between two contact surfaces 34, which are formed on the adjustable valve bodies of the first switching valve 21, which is preferably designed as a 2/2-way valve, and on the further, second switching valve 27.
  • the actuator 26 assigned to the first switching valve which can be either a piezo actuator or a solenoid valve, the first switching valve 21 and the further switching valve 27 are actuated in the switching direction 32, bridging the preliminary stroke 33 set between the contact surfaces 34.
  • the first switching valve 21, which is preferably in the form of a 2/2-way valve, is constantly subjected to high fuel pressure on its side 24 facing the high pressure source 20. Leakage oil pressure level is constantly present at the further switching valve 27, which can preferably be configured as a 2/2-way valve analogously to the first switching valve 21. If the actuator 26 assigned to the first switching valve 21 and the further switching valve 27 is energized, for example in the form of a piezo actuator, the first switching valve 21 opens from its closed position 22 shown in FIG. 1 into the open position identified by reference numeral 23.
  • the pressure present in the high-pressure source 20 thus acts on the inlet 8 on the high-pressure side and thus probably on the control chamber 2 and, via the nozzle chamber inlet 17, on the nozzle chamber 15, which encloses the nozzle needle 3.
  • the actuator 26, viewed in the switching direction 32 is actuated such that the forward stroke 33 set between the contact surfaces 34 is not exceeded, the further switching valve 27 remains in the closed position 28, i.e. there is no pressure relief of the control chamber 2 via the relief line 6 on the low pressure side 19 of the injector.
  • the second switching valve 27 is opened from its closed position 28 into its open position 29 in this state, there is a connection between the relief line 6 and the low-pressure side 19 of the fuel injector, ie the injector is now stroke-controlled. It is important that the discharge throttle 7 accommodated in the relief line 6 and the inlet throttle 9 accommodated in the inlet 8 on the high-pressure side are coordinated in such a way that pressure relief of the control chamber / nozzle needle system of the injector is ensured via these throttle elements 7, 8.
  • the spring force between the stop ring 10 and shoulder 12 on the nozzle needle 3 is dimensioned in such a way that it is adjusted to the required nozzle opening pressure.
  • the sealing spring 11 which acts as a nozzle holder spring, functions as a nozzle holder spring when the first switching valve 21 is switched on and the further switching valve 27 is switched on and, in the pressure-controlled operating mode of the fuel injector as shown in FIG. 1, indicates the injection openings in the cone region 16 of the nozzle needle 3 after the nozzle opening pressure has been exceeded the pressure shoulder 14 free.
  • the advantages that can be achieved with the outlined design variant include: to see that a very simple fuel injector can be realized.
  • the fuel injector according to the invention can be used both as a stroke-controlled and also operate as a pressure controlled injector. Otherwise, these operating modes can only be realized by a 3/2-way valve in combination with a 2/2-way valve, with increased effort being required.
  • the design ratio of the outlet throttle 7 accommodated in the relief line 6 and of the throttle element 9 accommodated in the inlet 8 on the high-pressure side can be varied accordingly, so that it is guaranteed at all times that the pressure is relieved High-pressure side of the fuel injector can be guaranteed.

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)

Abstract

L'invention concerne un injecteur de carburant permettant d'injecter du carburant dans la chambre de combustion d'un moteur à combustion interne, comportant un pointeau (3). Ledit pointeau peut se déplacer dans le corps de l'injecteur (1), entre une position libérant les orifices d'injection et une position les fermant, par montée en pression/réduction de pression dans la chambre de commande (2). La chambre de commande (2) peut être sollicitée côté huile de fuite, par l'intermédiaire d'une conduite de décharge (6) contenant un élément d'étranglement d'évacuation et d'une alimentation (8) côté haute pression, munie d'un élément d'étranglement d'alimentation (9), qui sollicite simultanément en carburant une chambre de pulvérisation (15) dans le corps d'injecteur (1). La modification de pression dans la chambre de commande (2) du corps d'injecteur (1) s'effectue par l'intermédiaire d'une première soupape de commande (21) et d'une autre soupape de commande (27), la première soupape de commande (21) présentant une précourse (33) dans le sens de commutation (32).
EP02750826A 2001-07-04 2002-07-04 Injecteur de carburant a commande de distributeur a 2 voies Withdrawn EP1415082A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10132248A DE10132248C2 (de) 2001-07-04 2001-07-04 Kraftstoffinjektor mit 2-Wege-Ventilsteuerung
DE10132248 2001-07-04
PCT/DE2002/002431 WO2003004863A1 (fr) 2001-07-04 2002-07-04 Injecteur de carburant a commande de distributeur a 2 voies

Publications (1)

Publication Number Publication Date
EP1415082A1 true EP1415082A1 (fr) 2004-05-06

Family

ID=7690472

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02750826A Withdrawn EP1415082A1 (fr) 2001-07-04 2002-07-04 Injecteur de carburant a commande de distributeur a 2 voies

Country Status (5)

Country Link
US (1) US20040011891A1 (fr)
EP (1) EP1415082A1 (fr)
JP (1) JP2004521263A (fr)
DE (1) DE10132248C2 (fr)
WO (1) WO2003004863A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004046899A1 (de) * 2004-09-28 2006-03-30 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung
CH704454A1 (de) * 2011-02-08 2012-08-15 Liebherr Machines Bulle Sa Einspritzvorrichtung für ein Fluid.
DE102012012420A1 (de) 2012-06-25 2014-01-02 L'orange Gmbh Injektor und Kraftstoffeinspritzeinrichtung mit einem solchen
DE102016205955B4 (de) * 2016-04-08 2022-10-27 Ford Global Technologies, Llc Direkteinspritzende Brennkraftmaschine mit einem Kraftstoffversorgungssystem umfassend eine Hochdruckleitung und Verfahren zum Betreiben einer derartigen Brennkraftmaschine
CN114165373A (zh) * 2021-12-17 2022-03-11 中国船舶重工集团公司第七一一研究所 喷油器和共轨系统

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JPS6036772A (ja) * 1983-08-10 1985-02-25 Diesel Kiki Co Ltd 燃料噴射弁
JPS60204961A (ja) * 1984-03-29 1985-10-16 Mazda Motor Corp デイ−ゼルエンジンの燃料噴射装置
JPH0759919B2 (ja) * 1986-04-04 1995-06-28 日本電装株式会社 デイ−ゼルエンジン用燃料噴射制御装置
US5237976A (en) * 1991-10-21 1993-08-24 Caterpillar Inc. Engine combustion system
AUPN391295A0 (en) * 1995-06-30 1995-07-27 Orbital Engine Company (Australia) Proprietary Limited Fuel injection apparatus
GB9616521D0 (en) * 1996-08-06 1996-09-25 Lucas Ind Plc Injector
DE19701879A1 (de) * 1997-01-21 1998-07-23 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen
DE19742320A1 (de) * 1997-09-25 1999-04-01 Bosch Gmbh Robert Kraftstoffeinspritzventil
DE19744518A1 (de) * 1997-10-09 1999-04-15 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
US6167869B1 (en) * 1997-11-03 2001-01-02 Caterpillar Inc. Fuel injector utilizing a multiple current level solenoid

Non-Patent Citations (1)

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Title
See references of WO03004863A1 *

Also Published As

Publication number Publication date
US20040011891A1 (en) 2004-01-22
DE10132248C2 (de) 2003-05-28
WO2003004863A1 (fr) 2003-01-16
JP2004521263A (ja) 2004-07-15
DE10132248A1 (de) 2003-01-23

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