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EP1923564A2 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP1923564A2
EP1923564A2 EP07117041A EP07117041A EP1923564A2 EP 1923564 A2 EP1923564 A2 EP 1923564A2 EP 07117041 A EP07117041 A EP 07117041A EP 07117041 A EP07117041 A EP 07117041A EP 1923564 A2 EP1923564 A2 EP 1923564A2
Authority
EP
European Patent Office
Prior art keywords
pressure
fuel injector
return
control
control valve
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Withdrawn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
EP07117041A
Other languages
German (de)
English (en)
Other versions
EP1923564A3 (fr
Inventor
Hans-Christoph Magel
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 EP1923564A2 publication Critical patent/EP1923564A2/fr
Publication of EP1923564A3 publication Critical patent/EP1923564A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from injectors
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/001—Control chambers formed by movable sleeves

Definitions

  • the invention relates to a fuel injector according to the preamble of claim 1.
  • stroke-controlled fuel injection systems can be used in which the injection pressure can be adapted to load and speed.
  • the opening movement of a nozzle needle is controlled by the control valve device via the pressure in the control chamber.
  • the object of the invention is to improve the switching behavior of the control valve device in a fuel injector according to the preamble of claim 1.
  • the object is with a fuel injector with an injector housing, which comprises a pressure chamber, from which by means of a control valve means highly pressurized fuel is injected into a combustion chamber of an internal combustion engine, wherein the control valve means comprises a control valve armature which is arranged in an armature space, which with a Return connected to which is subjected to low pressure, achieved in that between the armature space and the return a pressure holding valve device is provided. By the pressure holding valve device, the armature space is decoupled from the return path of the control amount.
  • the control quantity is the quantity of fuel which escapes from the control chamber into the return line when the control valve device is opened, in order to bring about an opening stroke of a nozzle needle in the fuel injector.
  • the switching dynamics of the control valve device of the fuel injector is independent of the return conditions.
  • influences of vibrations in the low-pressure system can be reduced to the switching behavior of the control valve device.
  • a plurality of successive injections can be dosed more accurately.
  • a preferred embodiment of the fuel injector is characterized in that the pressure-holding valve device comprises a check valve which interrupts a connection from the return to the armature space.
  • the check valve comprises a spring-biased check valve body.
  • a further preferred exemplary embodiment of the fuel injector is characterized in that, as a function of the pressure in a control chamber, high-pressure fuel is injected into the combustion chamber of the internal combustion engine when the pressure in the control chamber is changed by means of the control valve device.
  • a further preferred embodiment of the fuel injector is characterized in that the control chamber is connected directly to the return when the control valve device is open. This has the advantage that the control quantity is passed directly into the return when the control valve device is open.
  • a further preferred embodiment of the fuel injector is characterized in that the return comprises a return channel, which passes through a valve piece that limits the control room.
  • the valve piece Preferably, in the valve piece further comprises a drain passage is provided, which allows the flow of the control amount from the control room.
  • the drainage channel is preferably equipped with an outlet throttle.
  • a further preferred embodiment of the fuel injector is characterized in that the return passage can be closed by a part of the control valve device.
  • the return channel can be closed by a control valve piston of the control valve device.
  • the pressure-retaining valve device is arranged in a housing body part which delimits the armature space in the axial or radial direction.
  • the housing body part may be integrally connected to the injector housing.
  • the housing body part can also be designed as a separate part of the injector housing.
  • a further preferred exemplary embodiment of the fuel injector is characterized in that the fuel injector has at least one leakage path through which fuel enters the armature space.
  • the leakage path ensures a continuous flow or purging of the armature space.
  • armature space pressure is maintained. This allows a completely unaffected by the return pressure switching behavior of the control valve device can be achieved.
  • Another preferred embodiment of the fuel injector is characterized in that the leakage path is provided between a control valve piston and a control valve piston guide body.
  • the pilot leakage of the control valve piston fills the armature space, so that the desired pressure is set in the armature space.
  • a flushing of the armature space is ensured by the guide leakage.
  • Another preferred embodiment of the fuel injector is characterized in that the leakage path is provided between a nozzle needle and a nozzle needle guide body.
  • the guide leakage of the nozzle needle fills the armature space, so that sets in the armature space of the desired pressure.
  • a flushing of the armature space is ensured by the guide leakage.
  • a fuel injector 1 is shown schematically in longitudinal section.
  • the fuel injector 1 is supplied from a high-pressure reservoir 2 with fuel under high pressure. Via a feed line 3, the fuel injector 1 is connected to the high-pressure accumulator 2.
  • the supply line 3 opens inside the fuel injector 1 in a high-pressure connection space 4.
  • the high-pressure connection space 4 is enclosed by an injector 6.
  • the injector housing 6 comprises an injector body 7 and a nozzle body 8, which has a central guide bore 9.
  • a nozzle needle 10 is guided back and forth movable. Therefore, the nozzle body 8 is also referred to as a nozzle needle guide body.
  • the nozzle needle 10 has a tip 11, on which a sealing edge is formed, which forms a sealing seat on the projecting into the combustion chamber end of the injector 6. If the sealing seat at the tip 11 of the nozzle needle 10 is closed, then a plurality of injection holes in the Injektorgepuruse 6 are closed. When the nozzle needle tip 11 lifts from its seat, then high-pressure fuel is injected through the injection holes in the combustion chamber of the internal combustion engine. The opening movement of the nozzle needle 10 is controlled by a control valve device 12.
  • a pressure shoulder 14 is formed, which is arranged in a pressure chamber 15 which extends into the nozzle body 8.
  • the nozzle needle 10 is biased by a compression spring 16 with its tip 11 in its closed position.
  • flats 17, 18 are provided which allow the passage of fuel from the high-pressure connection space 4 in the pressure chamber 15.
  • a spring plate 19 is attached at the nozzle needle 10.
  • the compression spring 16 is clamped between the spring plate 19 and a control chamber limiting sleeve 20.
  • the control chamber limiting sleeve 20 defines in the radial direction a control chamber 22, which is limited to the combustion chamber from the combustion chamber distal end of the nozzle needle 10.
  • the control chamber 22 is connected via a connecting channel 24, which is equipped with a throttle, with the high pressure connection space 4 in connection. Since the control chamber 22 is filled with fuel via the communication passage 24 from the high-pressure communication space 4, the communication passage becomes 24 referred to as inlet channel.
  • the control chamber 22 is bounded on its side facing away from the combustion chamber by a first valve piece 26 which closes the high-pressure connection space 4. Between the first valve piece 26 and a cover 28 of the injector 6, a second valve piece 27 is clamped. The second valve piece 27 defines an armature space 30 at its end remote from the combustion chamber.
  • the armature space 30 is connected via a guide bore 31 with a connection space 32 in connection.
  • the connection space 32 in turn is connected to the high-pressure connection space 4 via a connection channel 34, which is equipped with a throttle.
  • a further connecting channel 35 which is also equipped with a throttle, the connecting space 32 communicates with the control chamber 22 in connection.
  • the connecting space 32 communicates with a low-pressure chamber 38, which in turn is connected to a return line 40.
  • the return 40 is subjected to low pressure.
  • a control valve piston 42 is guided reciprocally movable. Therefore, the second valve piece 27 is also referred to as a control valve piston guide body.
  • an armature 44 is fixed, which cooperates with a magnetic coil 45.
  • a compression spring 46 is clamped, so that a provided at the combustion chamber near the end of the control valve piston 42 sealing edge 48 is held on the first valve piece 26 in abutment.
  • the sealing edge 48 at the combustion chamber near the end of the control valve piston 42 closes the connecting channel 36, which is also referred to as a return channel.
  • the return 40 is connected via a return connection line 50 with the armature space 30 in connection.
  • a pressure-maintaining valve 52 is arranged in the cover 28 of the injector housing 6.
  • the armature space 30 is filled via a leakage path 54 between the control valve piston 42 and the guide bore 31. Via the leakage path 54 it is ensured that the desired pressure is established in the armature space 30. In addition, the armature space 30 is flushed through the guide leakage.
  • the control amount from the control chamber 22 is passed with open control valve device 12 via the return passage 36 directly into the return line 40.
  • a pressure-holding valve 56 is formed by a radially attached to the second valve member 27 ball 57 with a spring element 58.
  • the spring element 58 may be annular or flake-shaped.
  • FIG. 3 shows a similar fuel injector 1 as in FIGS. 1 and 2. To denote the same parts, the same reference numerals are used. To avoid repetition, reference is made to the preceding description of Figures 1 and 2. In the following, the differences between the individual embodiments will be discussed.
  • the pressure chamber 15 communicates with the supply line 3 via a high-pressure connection channel 60.
  • the nozzle needle 10 is extended at its end remote from the combustion chamber by a pressure piece 63.
  • the combustion chamber remote end of the pressure piece 63 limits the control chamber 22.
  • a seal 65 is arranged in the radial direction between the control chamber limiting sleeve 20 and the injector body 7.
  • the seal 65 seals in the injector body 7 an annular space 66, into which the supply line 3 discharges, from a low-pressure space 68, which is formed in the radial direction between the pressure piece 63 and the injector body 7.
  • the low pressure space 68 is via a low pressure connection channel 69 with an armature space 70 in connection.
  • the control chamber 22 is bounded on its combustion chamber remote side in the axial direction by a first valve piece 71.
  • a second valve piece 72 is clamped between the first valve piece 71 and a third valve piece 73.
  • a seal 74 seals the armature space 70 from the high-pressure annulus 66.
  • the first valve piece 71 has a central outlet channel 75, which is equipped with a throttle and connects the control chamber 22 with a connection space 85.
  • the drainage channel 75 is closed at its end remote from the combustion chamber by a valve ball 76.
  • the valve ball 76 is held by a control valve piston 78 in its closed position.
  • an armature 79 is fixed, which cooperates with a magnetic coil 80, between the armature 79 and a lid 84 of the injector 6 is a compression spring 81 is clamped.
  • the valve ball 76 is held in the region of the mouth of the discharge channel 75 in close contact with the first valve piece 71.
  • the solenoid coil 80 is energized, the armature 79 is attracted, so that the valve ball 76 lifts off on the first valve piece 71 to release a connection between the control chamber 22 and a return 86 via the drainage channel 75 and the connecting space 85.
  • a pressure-maintaining valve 92 is arranged between the connecting space 85 and the armature space 70. Since the control device 82 with the valve ball 76 is leak-free, the guide leakage 94 of the nozzle needle 10 and the guide leakage 95 of the pressure element 63 are used to purging the armature space 70. By the pressure holding valve 92, the pressure in the armature space 70 is maintained at a defined pressure value.

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)
EP07117041A 2006-11-16 2007-09-24 Injecteur de carburant Withdrawn EP1923564A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610054063 DE102006054063A1 (de) 2006-11-16 2006-11-16 Kraftstoffinjektor

Publications (2)

Publication Number Publication Date
EP1923564A2 true EP1923564A2 (fr) 2008-05-21
EP1923564A3 EP1923564A3 (fr) 2009-06-17

Family

ID=39009633

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07117041A Withdrawn EP1923564A3 (fr) 2006-11-16 2007-09-24 Injecteur de carburant

Country Status (2)

Country Link
EP (1) EP1923564A3 (fr)
DE (1) DE102006054063A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2138704A1 (fr) * 2008-06-19 2009-12-30 Robert Bosch GmbH Injecteur de carburant
EP2253830A1 (fr) * 2009-05-19 2010-11-24 Robert Bosch GmbH Groupe d'aimants à baïonnette
EP2604848A1 (fr) * 2011-12-14 2013-06-19 Delphi Technologies Holding S.à.r.l. Injecteur à carburant
WO2014067847A1 (fr) * 2012-11-05 2014-05-08 Delphi International Operations Luxembourg S.À.R.L. Ensemble soupape à trois voies
WO2018036786A1 (fr) * 2016-08-25 2018-03-01 Delphi Technologies Ip Limited Ensemble soupape de commande d'injecteur de carburant
CN107917030A (zh) * 2017-10-09 2018-04-17 中国第汽车股份有限公司 一种共轨喷油器控制阀
SE1951116A1 (en) * 2019-10-01 2021-04-02 Scania Cv Ab Fuel injector arrangement, high pressure injection system comprising the injector arrangement, fuel system comprising the high pressure injection system, vehicle comprising the fuel system, and a meth

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5803429A (en) * 1995-02-15 1998-09-08 Nippon Soken, Inc. Solenoid-operated hydraulic control valve for use in fuel injection system for internal combustion engine
US20040055576A1 (en) * 2002-08-08 2004-03-25 Mccarthy James E. Engine control for a common rail fuel system using fuel spill determination
EP1600627A1 (fr) * 2004-05-15 2005-11-30 L'orange Gmbh Soupape de régulation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5803429A (en) * 1995-02-15 1998-09-08 Nippon Soken, Inc. Solenoid-operated hydraulic control valve for use in fuel injection system for internal combustion engine
US20040055576A1 (en) * 2002-08-08 2004-03-25 Mccarthy James E. Engine control for a common rail fuel system using fuel spill determination
EP1600627A1 (fr) * 2004-05-15 2005-11-30 L'orange Gmbh Soupape de régulation

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2138704A1 (fr) * 2008-06-19 2009-12-30 Robert Bosch GmbH Injecteur de carburant
EP2253830A1 (fr) * 2009-05-19 2010-11-24 Robert Bosch GmbH Groupe d'aimants à baïonnette
EP2604848A1 (fr) * 2011-12-14 2013-06-19 Delphi Technologies Holding S.à.r.l. Injecteur à carburant
US9470196B2 (en) 2011-12-14 2016-10-18 Delphi International Operations Luxembourg SARL Fuel injector
WO2014067847A1 (fr) * 2012-11-05 2014-05-08 Delphi International Operations Luxembourg S.À.R.L. Ensemble soupape à trois voies
JP2015533401A (ja) * 2012-11-05 2015-11-24 デルファイ・インターナショナル・オペレーションズ・ルクセンブルク・エス・アー・エール・エル 三方向弁組立体
WO2018036786A1 (fr) * 2016-08-25 2018-03-01 Delphi Technologies Ip Limited Ensemble soupape de commande d'injecteur de carburant
CN107917030A (zh) * 2017-10-09 2018-04-17 中国第汽车股份有限公司 一种共轨喷油器控制阀
SE1951116A1 (en) * 2019-10-01 2021-04-02 Scania Cv Ab Fuel injector arrangement, high pressure injection system comprising the injector arrangement, fuel system comprising the high pressure injection system, vehicle comprising the fuel system, and a meth
SE545024C2 (en) * 2019-10-01 2023-02-28 Scania Cv Ab Fuel injector arrangement for an internal combustion engine and method for operating said arrangement

Also Published As

Publication number Publication date
EP1923564A3 (fr) 2009-06-17
DE102006054063A1 (de) 2008-05-21

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