EP1013919B1 - Soupape d'injection de combustible - Google Patents

Soupape d'injection de combustible Download PDF

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Publication number
EP1013919B1
EP1013919B1 EP99124112A EP99124112A EP1013919B1 EP 1013919 B1 EP1013919 B1 EP 1013919B1 EP 99124112 A EP99124112 A EP 99124112A EP 99124112 A EP99124112 A EP 99124112A EP 1013919 B1 EP1013919 B1 EP 1013919B1
Authority
EP
European Patent Office
Prior art keywords
valve
pressure
fuel
diffuser
fuel injection
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
EP99124112A
Other languages
German (de)
English (en)
Other versions
EP1013919A2 (fr
EP1013919A3 (fr
Inventor
Walter Egler
Peter Boehland
Lorenz Betz
Ralf Hentschel
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 EP1013919A2 publication Critical patent/EP1013919A2/fr
Publication of EP1013919A3 publication Critical patent/EP1013919A3/fr
Application granted granted Critical
Publication of EP1013919B1 publication Critical patent/EP1013919B1/fr
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
    • 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
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion
    • 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

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the claim from as known from EP-0 690 223 A2.
  • the injectors for the various Cylinder of the engine from a central high-pressure line supplied with fuel.
  • low fuel consumption and quiet engine operation ensure that all injectors have the fuel exactly the same in the engine inject. This can only be guaranteed if all injectors for the exact same time at an operating point have the same opening behavior.
  • Prior art electromagnetic or piezo-controlled valves which are available the actual injection valve.
  • the nozzle needle moves over a control piston.
  • the spool is above the pressure in the Control room moves.
  • US-A-5,806,766 describes an electro-hydraulically actuable injection valve, wherein a Control piston an annular channel of a between the control piston and an actuator rod arranged control space separates, wherein between the control piston and the actuator rod a spring is arranged.
  • the annular channel is also a control valve with connected to a process. If the control valve is closed when the injection valve is open, the control piston opens a connection between the annular channel and the control chamber, so that the nozzle needle is pressed onto the associated valve seat and the injection abruptly stops.
  • the control valve may be designed such that the valve needle presses a ball valve into a conical seat and so opens the outlet throttle and closes.
  • GB-A-2 316 447 is an injection valve for internal combustion engines with a nozzle needle, with an actuatable by means of an electromagnet directional control valve and with a Control room, which is connected to a supply line for pressurized fuel and is connected to a pressure relief line when the directional control valve is open.
  • the fuel pressure acts in the control chamber via a control piston on the back End of the nozzle needle together with a nozzle needle closing spring and thus pushes the Nozzle needle on a valve seat of the injector.
  • the drain designed as a throttle off the control chamber is closed with a valve ball in a conical seat.
  • EP-A-0 851 115 discloses an electromagnetic metering valve for a fuel injector shown.
  • the metering valve comprises a valve ball through which an outlet opening from the control chamber of the injection valve can be closed by the valve ball is pressed into a conical valve seat.
  • the precision of the injection process is determined by the movement of the control piston, the pressure in the control room and thus the flow through throttles and a switching valve depends.
  • the present invention is therefore based on the problem, a fuel injection valve for a high pressure injection of fuel from a central high pressure line in To provide combustion chambers, in which the opening and closing operation of the switching valve and the fuel passed through the switching valve as accurately as possible controlled becomes.
  • the fuel valve according to the invention with the features of claim 1 has the Advantage that the hydraulic flow through the switching valve even at low Rail pressure and small valve lift is precisely specified. This is the flow before the switching valve specifically constricted with a specially designed throttle geometry and extended. After contraction through the throttle inlet, the fuel flow spreads in the throttle geometry according to the invention in the direction of the throttle wall from that by optimal pressure difference at the valve of the hydraulic flow increases and the opening movement of the valve ball is supported away from the valve seat.
  • the flow resistance is reduced, so that it is already at a small switching valve and small rail pressure to a high Flow comes.
  • the high flow leads in the inlet to the throttle to high Flow rate.
  • the diameter of the diffuser is Transition to the conical seat only slightly smaller than the seat diameter. Thereby is the largest possible hydraulic cross-section of the valve when lifting the Valve ball reached.
  • FIG. 1 an injector is shown.
  • the fuel injection valve has a housing 2 on, which is connected to a connection 3 for the supply of injection pressure Fuel is connected from a high-pressure fuel storage, not shown.
  • an injection valve needle 5 is arranged, which has a Fmmugnsabêt 6, which has a within the pressure chamber 7 lying shoulder in a smaller diameter part 9 of the injection valve needle passes.
  • this one conical sealing surface 10 which cooperates with a valve seat 11 and the Injection openings 12 depending on the position of the injector needle opens or closes.
  • the pressure chamber 7 is constantly connected via a pressure line 4 to the terminal 3, so that the pressure chamber 7 is constantly under high injection pressure.
  • the needle 5 is controlled by the pressure piece 21 and the control piston 13.
  • the spool plunges into a cylinder 14 in which it encloses a control pressure chamber 15 at the end. This is connected via a throttle bore 16 in constant communication with the terminal. 3
  • the flow through the throttle bore 17 is controlled by the electric valve 19.
  • the relief room is connected via a discharge nozzle 20 on the housing 2 with a return.
  • the fuel injection valve described above is supplied from the high-pressure fuel storage via the terminal 3 with high pressure. This is anxious to raise in action on the shoulder 9, the fuel injection valve needle 5, so that from the pressure chamber 7 along the smaller diameter part 9 of the injection valve needle fuel to the injection ports 12 can flow and exit there. This opening counteracts the spring 18, which alone is not sufficient to keep the injector needle 5 in the pressure chamber 7 pending high fuel pressure in the closed position, but does so in the absence of high fuel pressure.
  • the task of closing continues to take over the pressure in the control pressure chamber 15, which is the same when the electrically operated valve 19 is closed as the pressure in the pressure chamber 7. Due to the larger end face of the control piston 14, the closing force and the valve remains closed.
  • the electrically operated valve 19 is opened, so that the pressure chamber 15 is uncoupled relieved by the throttle bore 16 and thus outweighs the opening force on the shoulder 8.
  • the electrically operated valve 10 is closed again.
  • Fig. 2 the two embodiments of the invention are shown in section.
  • the upper part shows an embodiment with a conically extending in the flow direction to the conical seat of the ball valve 50 throttle bore 31.
  • the cone angle ⁇ are designed for maximum pressure recovery in the flow.
  • the lower part shows an embodiment is also generated by the conically widening in the flow direction ⁇ with the angle throttle bore 17 and two series-connected diffusers 30 and 40 maximum pressure recovery.
  • the fuel flows during injection from the pressure chamber 15 into the throttle bore 17 or 31, gaining speed. At the same time it reduces static pressure in the flow. In the region of the diffuser 30, the flow is applied the wall (see the schematic representation of the fuel flow through arrows in Fig. 1) expands and is decelerated at the same time.
  • the second diffuser 40 amplifies this process, causing the static pressure within the flow in Flow direction increases. This increased static pressure assists in opening of the switching valve, the movement of the valve ball 50 in the flow direction and accelerated hence the increase in fuel flow through the switching valve. simultaneously the increased fuel flow increases the cavitation tendency at the beginning of the throttle.
  • the diameter of the second Diffuser 40 only slightly smaller than the diameter of the valve seat line 52 is formed.
  • the throttle bore 15 slightly conically widened in the flow direction and preferably has a cone angle ⁇ up to 5 °
  • the throttle bore 17, the two Diffusers 30, 40 or 31 and the valve seat 51 are aligned collinear and form a total a funnel whose wider opening is closed by the valve ball 50 or is opened.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (5)

  1. Injecteur de carburant pour une injection haute pression de carburant à partir d'une conduite centrale à haute pression dans des chambres de combustion d'un moteur à combustion interne, qui comprend une soupape de commutation (19) avec un siège de soupape (51) de forme conique et une bille de soupape (50), la bille de soupape (50) étant soulevée du siège de soupape conique (51) à l'état ouvert qui alimentée par une chambre de pression (15) en liaison active avec une conduite centrale à haute pression à partir d'un orifice d'étranglement (17, 31),
    caractérisé en ce que
    l'orifice d'étranglement (17, 31) est un diffuseur s'élargissant en forme d'entonnoir en direction du siège de soupape (51) entre l'entrée d'étranglement au niveau de la chambre de pression (15) et le siège de soupape (51) de forme conique, de sorte que l'écoulement du carburant vienne longer essentiellement la paroi de l'orifice d'étranglement (17, 31).
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    le diffuseur est un diffuseur conique (31), un diffuseur progressif (30, 40) ou une combinaison des deux.
  3. Injecteur de carburant selon la revendication 1 ou 2,
    caractérisé en ce que
    le diamètre lors du passage au siège de soupape (51) de forme conique n'est de préférence que légèrement plus petit que celui du siège (52).
  4. Injecteur de carburant selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce que
    le diffuseur est conçu pour que l'écoulement longe la paroi et qu'un maximum de pression puisse être récupéré.
  5. Injecteur de carburant selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce que
    l'orifice d'étranglement (17, 31), le diffuseur dans son ensemble et le siège de soupape (51) forment un entonnoir, la bille de soupape pouvant se déplacer en face de l'orifice central de cet entonnoir.
EP99124112A 1998-12-22 1999-12-02 Soupape d'injection de combustible Expired - Lifetime EP1013919B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19859537A DE19859537A1 (de) 1998-12-22 1998-12-22 Kraftstoffeinspritzventil
DE19859537 1998-12-22

Publications (3)

Publication Number Publication Date
EP1013919A2 EP1013919A2 (fr) 2000-06-28
EP1013919A3 EP1013919A3 (fr) 2002-02-13
EP1013919B1 true EP1013919B1 (fr) 2004-10-20

Family

ID=7892302

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99124112A Expired - Lifetime EP1013919B1 (fr) 1998-12-22 1999-12-02 Soupape d'injection de combustible

Country Status (4)

Country Link
US (1) US6276335B1 (fr)
EP (1) EP1013919B1 (fr)
JP (1) JP2000186647A (fr)
DE (2) DE19859537A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10007175B9 (de) * 2000-02-17 2004-11-04 Siemens Ag Einspritzventil für die Einspritzung von Kraftstoff in eine Verbrennungskraftmaschine
DE10039215A1 (de) * 2000-08-11 2002-02-28 Bosch Gmbh Robert Sitzventilanordnung, insbesondere für ein Kraftstoffeinspritzsystem einer Verbrennungsmaschine
JP2003113761A (ja) 2001-08-01 2003-04-18 Denso Corp 燃料噴射弁
DE10152173A1 (de) * 2001-10-23 2003-04-30 Bosch Gmbh Robert Magnetventil zur Steuerung eines Einspritzventils
US7111614B1 (en) 2005-08-29 2006-09-26 Caterpillar Inc. Single fluid injector with rate shaping capability
DE102006034111A1 (de) * 2006-07-24 2008-01-31 Robert Bosch Gmbh Servoventilgesteuerter Injektor zur Einspritzung von Kraftstoff in Zylinderbrennräume von Brennkraftmaschinen; insbesondere Common-Rail-Injektor
DE102007004553A1 (de) * 2007-01-30 2008-07-31 Robert Bosch Gmbh Kugelsitzventil mit verringertem Erosionsverhalten
DE102008044096A1 (de) 2008-11-27 2010-06-02 Robert Bosch Gmbh Verfahren zur Herstellung von Drosselbohrungen mit niedrigem Kaviationsumschlagpunkt
DE102009028943A1 (de) * 2009-08-27 2011-03-03 Robert Bosch Gmbh Kavitationserosionsoptimiertes Kugelsitzventil
JP5051279B2 (ja) * 2009-12-21 2012-10-17 株式会社デンソー 定残圧弁
DE102010063981A1 (de) * 2010-12-22 2012-06-28 Continental Automotive Gmbh Magnetodynamischer Aktor und Verfahren zur Betätigung eines Kraftstoffeinspritzventils
DE102013214589A1 (de) * 2013-07-25 2015-01-29 Robert Bosch Gmbh Schaltventil für einen Kraftstoffinjektor
DE102015204255A1 (de) * 2015-03-10 2016-09-15 Robert Bosch Gmbh Kraftstoffinjektor für ein Kraftstoffeinspritzsystem
FR3055370B1 (fr) * 2016-09-01 2020-05-01 Delphi Technologies Ip Limited Ensemble de bobine

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1250900B (it) * 1991-12-24 1995-04-21 Elasis Sistema Ricerca Fiat Valvola di iniezione del combustibile a comando elettromagnetico.
CH689282A5 (de) * 1994-03-29 1999-01-29 Christian Dipl-Ing Eth Mathis Einspritzventil fuer eine insbesondere als Dieselmotor vorgesehene Brennkraftmaschine.
IT232490Y1 (it) * 1994-07-01 2000-01-10 Elasis Sistema Ricerca Fiat Dispositivo di registrazione della corsa dell'otturatore per un iniettore di combustibile
ATE199966T1 (de) * 1995-06-02 2001-04-15 Ganser Hydromag Brennstoffeinspritzventil für verbrennungskraftmaschinen
DE19618468C1 (de) * 1996-05-08 1997-04-30 Siemens Ag Einspritzventil
DE19624001A1 (de) * 1996-06-15 1997-12-18 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
DE19634105A1 (de) * 1996-08-23 1998-01-15 Daimler Benz Ag Einspritzventil für Verbrennungskraftmaschinen
IT1289795B1 (it) * 1996-12-23 1998-10-16 Elasis Sistema Ricerca Fiat Perfezionamenti ad una valvola di dosaggio a comando elettromagnetico, con otturatore a sfera, per un iniettore di combustibile.
US5890653A (en) * 1998-04-23 1999-04-06 Stanadyne Automotive Corp. Sensing and control methods and apparatus for common rail injectors
DE19822503C1 (de) * 1998-05-19 1999-11-25 Siemens Ag Steuerventil für Kraftstoffeinspritzventil
JP3704957B2 (ja) * 1998-07-06 2005-10-12 いすゞ自動車株式会社 インジェクタ

Also Published As

Publication number Publication date
US6276335B1 (en) 2001-08-21
DE19859537A1 (de) 2000-07-06
EP1013919A2 (fr) 2000-06-28
DE59910896D1 (de) 2004-11-25
JP2000186647A (ja) 2000-07-04
EP1013919A3 (fr) 2002-02-13

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