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EP1334271B1 - Injecteur commande par course/et pression et pourvu d'un double piston - Google Patents

Injecteur commande par course/et pression et pourvu d'un double piston Download PDF

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Publication number
EP1334271B1
EP1334271B1 EP01992832A EP01992832A EP1334271B1 EP 1334271 B1 EP1334271 B1 EP 1334271B1 EP 01992832 A EP01992832 A EP 01992832A EP 01992832 A EP01992832 A EP 01992832A EP 1334271 B1 EP1334271 B1 EP 1334271B1
Authority
EP
European Patent Office
Prior art keywords
injector
pressure
injector body
housing
slide
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
EP01992832A
Other languages
German (de)
English (en)
Other versions
EP1334271A1 (fr
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 EP1334271A1 publication Critical patent/EP1334271A1/fr
Application granted granted Critical
Publication of EP1334271B1 publication Critical patent/EP1334271B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M63/0005—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 valves actuated by fluid 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
    • F02M47/025—Hydraulically actuated valves draining the chamber to release the closing pressure

Definitions

  • High-pressure storage systems are used today in injection systems on direct-injection internal combustion engines. These have the task of storing the fuel under high pressure. Pressure fluctuations that may arise from the pumping movement and the injection process are to be dampened by the fuel volume contained in the high-pressure accumulator.
  • the fuel is injected into the combustion chambers of the internal combustion engines by means of injectors. Start of injection and injection quantity are set on the injectors; these are preferably arranged on the cylinder head of an internal combustion engine.
  • EP 1 036 931 A2 relates to a fuel injector arrangement with a nozzle which contains a first bore in which a nozzle needle is slidably mounted.
  • the needle cooperates with a seat to control the flow of fuel from a supply chamber to an outlet opening, with an area associated with the needle being exposed to fuel pressure in a control room.
  • a control valve that can be operated with fuel pressure controls the supply of fuel to the supply chamber.
  • a piston is slidably disposed in the control valve ( Figure 5).
  • DE 198 35 494 A1 relates to a pump nozzle unit. This serves to supply fuel to a combustion chamber of direct-injection internal combustion engines with a pump unit for building up an injection pressure. Injectors are provided for injecting the fuel into the combustion chamber.
  • the system further comprises a control unit with a control valve, which is designed as an outward opening A valve.
  • a valve actuation unit for controlling the pressure build-up in the pump unit is also included.
  • an injector design can be achieved in an advantageous manner, which enables both stroke control of the injector body and its pressure control. This allows the latest requirements from the requirements of commercial vehicle engine manufacturers to be taken into account, which require injector control according to two separate principles in order to be able to operate the internal combustion engine at the optimum operating point at all times.
  • the configuration of the 3/2-way valve via the stroke of the 3/2-way valve can suddenly relieve the pressure in the nozzle space of the injection nozzle.
  • the sudden relief of the nozzle space causes pressure control of the injector in this operating state.
  • the sudden relief of the nozzle space takes place when the valve body is controlled in the injector housing, covering the full stroke; if, on the other hand, the injector is operated in partial pressure, one of the slides formed in the injector body can also be closed, while the other slider formed in the injector body is open at its control edge and thus permits a stroke , so that a transition from stroke to pressure control and vice versa of the injector can be achieved in a simple manner and the vertical position of the injector body is defined relative to the injector housing.
  • the vertical movement of the injector body in the housing of the injector takes place by means of a piezo actuator provided at one end of the valve body or another electrical actuating element with which the individual slider / control edge combination can be closed or opened differently under the influence of the shortest response times.
  • Solenoid valves or piezo actuators can advantageously be used as actuators to relieve the pressure in the control room.
  • the single figure shows a longitudinal section through an injector through a 3/2-way valve, on the injector body of which two slide edges offset from one another in the vertical direction are formed.
  • the illustration according to the single figure shows the longitudinal section through an injector body on which two-slide / control edges are formed.
  • the injector 1 shown in the illustration according to FIG. 1 for injecting fuel under high pressure into the combustion chambers of an internal combustion engine is part of an injection system which comprises a high-pressure plenum (common rail).
  • a high-pressure plenum common rail
  • the fuel is kept at an extremely high pressure level by means of a pump in order to use the fuel volume in the pump chamber as a damping element for pressure flushing induced by the pump movement or pressure oscillation induced by the movement of the injector in the line system.
  • the injector 1 resulting from the illustration according to FIG. 1 essentially comprises an injector body 3 which can be moved vertically in a housing 2.
  • the injector body 3 is embedded as a rotationally symmetrical component in a bore in the housing 2.
  • a push rod element 4 is arranged opposite this, which is opposite a piston 16, which in turn interacts with a control chamber 15 formed in the injector body 3.
  • control chamber 6 On the upper side of the injector body 3 as shown in FIG. 1 there is a control chamber 6, the upper cylindrical end face of which is opposite.
  • the control chamber 6 is constantly supplied with fuel under high pressure via a branch 8, so that it is ensured that always one there is sufficient tax amount of fuel in the upper control chamber 6.
  • a throttle element is let into the supply line 8, which on the one hand opens into the upper control chamber 6 and on the other hand branches off from the high-pressure plenum inlet.
  • the upper control chamber 6 can be relieved of pressure via a relief opening 7, to which an outlet throttle 9 connects.
  • the pressure relief of the upper control chamber 6 and thus the induction of the vertical upward and downward movement of the injector body 3 in the housing 2 of the injector takes place by the control of an actuator element 10, which can be designed, for example, as a solenoid valve or as a piezo actuator and the pressure on the controls as a closing element ball element. If the spherical element acting as the closing element is relieved of pressure, its seating area is free, so that a fuel volume which is established in accordance with the flow restrictor configuration 9 flows continuously out of the upper control chamber 6 via the relief opening 7, so that a vertical upward movement of the injector body 3 in the housing 2 of the injector 1 sets.
  • a high-pressure fuel is applied to a bore system provided in the interior of the injector body 3 via the high-pressure plenum inlet 11, which opens into an annular space 20 that extends around the injector body 3.
  • a transverse bore 12 which extends perpendicular to the line of symmetry of the injector body 3 and a central bore 13 which is connected thereto and runs coaxially to the line of symmetry of the injector body 3, an inlet throttle element 14 located at the end of the central bore 13 is subjected to fuel under high pressure.
  • a control chamber 15 provided in the latter is acted upon by fuel under high pressure.
  • the inlet throttle 14 opens into the upper boundary wall 30 of the control chamber 15, which on the other hand is delimited by the piston surface 17 of a piston 16 arranged coaxially to the axis of symmetry of the injector body 3.
  • a cylindrical boundary wall 32 of the control chamber 15 is located between the two boundary surfaces 17 and 30.
  • control chamber 15 While the control chamber 15 is pressurized within the injector body 3 via the line system 11, 12, 13, 14, the pressure relief of the control chamber 15 within the injector 3 and thus a vertical upward movement of the piston 16 with its piston surface 17 into the control chamber 15 can thereby be achieved be that the pressure relief of the upper control chamber 6, the injector body 3 as a whole, a vertical opening movement is impressed.
  • the control chamber 15 can be relieved of pressure by means of a discharge throttle 18 opening into its cylinder wall 32 and an adjoining bore with a corresponding upward movement of the injector body 3 via a pressure relief line 28, so that during the upward movement of the piston 16 with its piston surface 17 into the control chamber 15 whose pressure relief an opening of the nozzle needle of the injector 5 can be achieved from its seat
  • a nozzle feed line 21, which is designed to be resistant to high pressure, is also accommodated, via which the fuel injector 5, which is not shown here, can be acted upon by fuel under high pressure.
  • the injector body 3 is placed in a position in which the nozzle feed line 21 is closed on the high pressure side by the abutment of a seat surface 22 of the injector 3 on the housing 2. H.
  • the high-pressure fuel volume contained in the annular space 20 is in contact with the control space 15 via the bores 12, 13, 14 and thereby closes the nozzle; on the other hand, there is no fuel under high pressure in the nozzle chamber of the injection nozzle 5, since the sealing seat 22 separates the nozzle inlet 21 from the high-pressure collecting chamber inlet 11 on the housing side.
  • Relieving the pressure on the upper control chamber 6 by actuating the electric actuator 10 leads to a pressure relief of the upper control chamber 6.
  • the cylindrical end face of the injector body 3 moves into it, so that a vertical ascending movement of the injector body 3 in the housing 2 of the injector 1 occurs .
  • a first slide 23 moves on the injector body 3 Via a first control edge 24 on the housing side.
  • the injector body 3 can be opened further. This leads to the opening of the second slide 25 after passage of the control edge 26 provided on the housing. If the second slide is opened, pressure relief of the control chamber 15 by the outlet throttle 18 occurs in the annular space surrounding the injector body 3, which contains an outlet line 28.
  • the nozzle needle of the injection nozzle 5 opens on its seat surface, so that the fuel volume that is present in the nozzle feed line 21 — the seat surface 22 of the injector body 3 is open — can be injected under high pressure.
  • the injector is pressure controlled, while in the partial stroke mode, i.e. H. the generation of only one upward movement of the injector body 3, which corresponds to the stroke 27, the injector is stroke-controlled.
  • a leakage oil chamber is identified by reference numeral 29, in which fuel from the control chamber 15 collects along the piston 16. This, like the control volume flowing out of the upper control chamber 6 via the relief line 7, and that via the.
  • the discharge throttle 18 and the discharge line 28 from the control volume 15 flowing out of the control chamber 15 provided in the injector body are fed back to the fuel tank.
  • both the high-pressure plenum inlet 11 to the annular space 20 and the branch 8 to the upper control chamber 6 and the nozzle inlet 21 in the housing 2 of the injector 1 are designed as bores and the housing is made of high-strength metallic material.
  • the injector body 3 which can be moved up and down in the housing 2 of the injector 1.

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)
  • Nozzles (AREA)

Claims (7)

  1. Injecteur pour l'injection de carburant dans la chambre de combustion d'un moteur à combustion interne, comportant un corps d'injecteur (3) mobile dans un boîtier (2), dont le mouvement de course vertical par rapport au boîtier (2) s'effectue par le biais d'une chambre de commande (6) pouvant être dépressurisée au moyen d'un actionneur (10), le mouvement de course vertical du corps d'injecteur (3) effectuant la fermeture ou la libération d'une conduite d'entrée de buse (21) menant à la buse d'injection (5), prévue dans le boîtier (2) de l'injecteur et pouvant recevoir du carburant sous haute pression,
    caractérisé en ce qu'
    au niveau du corps d'injecteur (3), pour la commande de course ou de pression de l'injecteur, un premier tiroir (23) et un autre tiroir (25) sont décalés l'un par rapport à l'autre, une chambre de commande (15) pouvant être mise sous pression par l'intermédiaire de l'entrée de la chambre collectrice haute pression (11) est configurée dans le corps d'injecteur (3), les tiroirs (23) ou (25) coopérant du côté du boîtier avec des arêtes de commande (24) ou (26) et commandant ainsi une liaison entre la conduite d'entrée de buse (21) ou la chambre de commande (15), et une conduite d'évacuation (28).
  2. Injecteur selon la revendication 1,
    caractérisé en ce qu'
    un trajet de course partiel (27) permettant la fermeture du premier tiroir (23) est inférieur au trajet de course nécessaire à l'ouverture de l'autre tiroir (25) pour la dépressurisation de la chambre de commande (15) dans le corps d'injecteur (3).
  3. Injecteur selon la revendication 2,
    caractérisé en ce que
    la chambre de commande (15) peut être dépressurisée par un étrangleur d'évacuation (18).
  4. Injecteur selon la revendication 1,
    caractérisé en ce que
    le corps d'injecteur (3) contient un système d'alésages (12, 13), ainsi qu'un étranglement d'entrée (14) qui maintient la chambre de commande (15) constamment sous haute pression.
  5. Injecteur selon la revendication 1,
    caractérisé en ce qu'
    un ensemble piston/poussoir (4), (16) est relié mécaniquement à la buse d'injection (5) et ouvre la buse d'injection (5) lors de la dépressurisation de la chambre de commande (15).
  6. Injecteur selon la revendication 1,
    caractérisé en ce que
    la chambre de commande (6) commandant le mouvement de course vertical du corps d'injecteur (3) peut être mise sous pression par un embranchement (8) à partir de l'entrée de la chambre collectrice haute pression (11) et peut être dépressurisée par un actionneur (10) pouvant être commandé et doté d'un élément d'étranglement d'évacuation en amont.
  7. Injecteur selon la revendication 1,
    caractérisé en ce que
    lors de l'ouverture d'une surface d'appui (22) au niveau d'un espace annulaire (20) dans le boîtier (2) de l'injecteur (1), la conduite d'entrée de buse (21) est mise sous haute pression et en même temps le premier tiroir (23), (24) est fermé, et l'ouverture de la buse d'injection (5), par une dépressurisation de la chambre de commande (15), s'effectue par une ouverture du deuxième tiroir (25), (26) dans la conduite d'évacuation (28).
EP01992832A 2000-10-31 2001-09-21 Injecteur commande par course/et pression et pourvu d'un double piston Expired - Lifetime EP1334271B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10053903 2000-10-31
DE10053903A DE10053903A1 (de) 2000-10-31 2000-10-31 Hub-/ und Druckgesteuerter Injektor mit Doppelschieber
PCT/DE2001/003658 WO2002036958A1 (fr) 2000-10-31 2001-09-21 Injecteur commande par course/et pression et pourvu d'un double piston

Publications (2)

Publication Number Publication Date
EP1334271A1 EP1334271A1 (fr) 2003-08-13
EP1334271B1 true EP1334271B1 (fr) 2004-12-29

Family

ID=7661639

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01992832A Expired - Lifetime EP1334271B1 (fr) 2000-10-31 2001-09-21 Injecteur commande par course/et pression et pourvu d'un double piston

Country Status (6)

Country Link
US (1) US6848630B2 (fr)
EP (1) EP1334271B1 (fr)
JP (1) JP2004512464A (fr)
AT (1) ATE286208T1 (fr)
DE (2) DE10053903A1 (fr)
WO (1) WO2002036958A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10141221B4 (de) * 2001-08-23 2009-07-30 Robert Bosch Gmbh Druck-Hub-gesteuerter Injektor für Kraftstoffeinspritzsysteme
DE10336411A1 (de) * 2003-08-08 2005-03-03 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine
JP4078320B2 (ja) * 2004-02-27 2008-04-23 三菱重工業株式会社 ポペット弁装置及びそれを備えた電子制御燃料噴射装置
DE102004030446A1 (de) * 2004-06-24 2006-01-12 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung
DE102005014180A1 (de) * 2005-03-29 2006-10-05 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DK177456B1 (en) * 2011-06-27 2013-06-17 Man Diesel & Turbo Deutschland A fuel valve for large turbocharged two stroke diesel engines

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD103691A1 (fr) * 1973-04-06 1974-02-05
JPH07117012B2 (ja) * 1986-09-05 1995-12-18 トヨタ自動車株式会社 ユニツトインジエクタ
US5263645A (en) * 1991-11-01 1993-11-23 Paul Marius A Fuel injector system
US5397055A (en) * 1991-11-01 1995-03-14 Paul; Marius A. Fuel injector system
AT408134B (de) * 1995-06-06 2001-09-25 Avl Verbrennungskraft Messtech Speichereinspritzsystem für dieselbrennkraftmaschinen
DE19701879A1 (de) * 1997-01-21 1998-07-23 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen
DE19716221B4 (de) * 1997-04-18 2007-06-21 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung mit Vor- und Haupteinspritzung bei Brennkraftmaschinen, insbesondere für schwer zündbare Kraftstoffe
DE29708369U1 (de) * 1997-05-09 1997-07-10 FEV Motorentechnik GmbH & Co. KG, 52078 Aachen Steuerbares Einspritzventil für die Kraftstoffeinspritzung an Brennkraftmaschinen
DE19742073A1 (de) * 1997-09-24 1999-03-25 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
DE19835494C2 (de) * 1998-08-06 2000-06-21 Bosch Gmbh Robert Pumpe-Düse-Einheit
GB9823134D0 (en) * 1998-10-23 1998-12-16 Lucas Ind Plc Valve
GB9905896D0 (en) 1999-03-16 1999-05-05 Lucas Ind Plc Fuel injector arrangement
DE19923421C2 (de) * 1999-05-21 2003-03-27 Bosch Gmbh Robert Injektor
US6227459B1 (en) * 1999-08-02 2001-05-08 Caterpillar Inc. Valve with self-centering, self-sealing seat component
DE19939448A1 (de) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Injektor

Also Published As

Publication number Publication date
JP2004512464A (ja) 2004-04-22
WO2002036958A1 (fr) 2002-05-10
ATE286208T1 (de) 2005-01-15
US20030089792A1 (en) 2003-05-15
DE10053903A1 (de) 2002-05-29
US6848630B2 (en) 2005-02-01
DE50104994D1 (de) 2005-02-03
EP1334271A1 (fr) 2003-08-13

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