EP2829717A1 - Kraftstoffeinspritzer - Google Patents

Kraftstoffeinspritzer Download PDF

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Publication number
EP2829717A1
EP2829717A1 EP13177670.0A EP13177670A EP2829717A1 EP 2829717 A1 EP2829717 A1 EP 2829717A1 EP 13177670 A EP13177670 A EP 13177670A EP 2829717 A1 EP2829717 A1 EP 2829717A1
Authority
EP
European Patent Office
Prior art keywords
needle
control chamber
injector
nozzle
pressure
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Withdrawn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
EP13177670.0A
Other languages
English (en)
French (fr)
Inventor
Thierry Thibault
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.)
Delphi International Operations Luxembourg SARL
Original Assignee
Delphi International Operations Luxembourg SARL
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 Delphi International Operations Luxembourg SARL filed Critical Delphi International Operations Luxembourg SARL
Priority to EP13177670.0A priority Critical patent/EP2829717A1/de
Priority to PCT/EP2014/065637 priority patent/WO2015011097A1/fr
Priority to EP14748145.1A priority patent/EP3025049B1/de
Priority to US14/906,635 priority patent/US20160153412A1/en
Priority to CN201480041760.5A priority patent/CN105408615B/zh
Priority to KR1020167001335A priority patent/KR20160033108A/ko
Publication of EP2829717A1 publication Critical patent/EP2829717A1/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Withdrawn legal-status Critical Current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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle 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
    • 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
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/008—Means for influencing the flow rate out of or into a control chamber, e.g. depending on the position of the needle

Definitions

  • the present invention relates to a fuel injector for vehicle engines. It deals particularly with the control system of the injector.
  • the fuel injectors are provided with a needle moving in a tubular body.
  • the movements of the needle are a function of a pressure difference between an upstream control chamber and the downstream nozzle.
  • the fuel flows into the body from an inlet mouth to the injection nozzle.
  • the fuel passes in particular by a restriction which creates a pressure drop so that the fuel injected by the nozzle is less than that arriving at the inlet mouth.
  • the difference is of the order of 200 bars.
  • the present invention aims to solve these problems by providing a pressurized fuel injector comprising a tubular body extending along a longitudinal axis and forming at one end a nozzle.
  • the fuel circulates in the body between an inlet mouth and the nozzle and also comprising a needle arranged axially in the body and able to move between an open nozzle position and a closed nozzle position, the fuel flowing in the space between needle and the inner side of the body.
  • the needle is controlled according to a pressure difference between a first control chamber into which the upstream end of the needle opens and the nozzle downstream, the pressure in the first control chamber being regulated by a control valve.
  • the injector is further provided with a complementary means for controlling the needle cooperating with the first control chamber so that the fuel pressure at the inlet mouth is integrally transmitted to the nozzle. 'injection.
  • the complementary control means comprises a second control chamber arranged in the needle and connected to said space by a calibrated orifice.
  • the needle is provided with an axial blind bore opening into the upstream end of the needle, the bore forming the second control chamber.
  • the additional control means further comprises a shutter member secured to the body and arranged to close the upstream portion of the second control chamber.
  • the shutter member is a cylindrical piston whose section is slidably adjusted to that of the bore of the needle, the cylindrical piston being in abutment against a wall of the first control chamber.
  • the complementary control means further comprises a filling channel of the second control chamber and another passive valve opening or closing said filling channel.
  • an injector characterized in that the setting of the spring is low enough to allow sealing of the ball on its seat.
  • An internal combustion engine (not shown) comprises an injection system provided with one or more injectors 10 which extends along a longitudinal axis Z.
  • the injector is provided with a tubular body 12 defining an interior space E in which circulates fuel C pressurized between an inlet mouth 14 upstream and an injection nozzle 16 forming the downstream tip of the body 12.
  • a needle 18 slidable between an open nozzle position PO, needle “up” in the direction of the figure, and a closed nozzle position PF needle down ".
  • the needle 18 extends from an upstream end 20 opening into a control chamber 22 to a downstream end 24 in the nozzle 16.
  • the control chamber 22 is made in a thick plate 26 integral with the body 12, the fuel arriving by a first channel 28 and starting with a control channel 30 whose opening and closing are controlled by a control valve 32 controlled by an electromagnet 34.
  • the needle 18 is provided with an axial blind bore 36 opening only through the upstream end 20 of the needle 18.
  • a calibrated orifice 38 of small section At the bottom of the bore 36 extends radially a calibrated orifice 38 of small section.
  • the orifice 38 passes through the needle 18 from the bore 36 until it opens into the space E.
  • the bore 36 is also in fluid communication with the space E by means of a filling channel 40.
  • the channel 40 of large section extends from the bottom 42 of the bore 36 to the wall of the outside of the needle.
  • the channel 40 comprises an axial portion connected to the center of a radial passage opening on either side of the needle.
  • Other embodiments are of course possible, for example in a single section at an angle.
  • a piston 44 which has the shape of a cylinder of revolution whose upper end 46 is in abutment against the transverse wall 48 of the thick plate 26, forming an imaged manner like this is visible on the figure 1 the "ceiling" of the control chamber 22.
  • the piston 44 extends into the bore 36 to a lower end 50 remote from the bottom 42 of the bore 36.
  • the bore space below piston 44 forms a second control chamber 52 into which open the calibrated orifice 38 and the filling channel 40.
  • a passive valve 54 comprising a ball 56 permanently biased by a spring 58 against a seat 60 formed at the bottom of the bore 42 and circumnavigating the arrival of the filling channel 40.
  • the spring 58 is compressed between the ball 56 and the lower end 50 of the piston 44.
  • Many passive valve construction alternatives exist in particular by replacing the ball by another shutter member such as a flat tip attached to the end of the spring.
  • the geometry of the valve seat is then chosen complementary to that of the shutter member.
  • the injector 10 of the figure 1 is shown in the open nozzle PO position, the needle being at the top, the fuel C leaving the nozzle 16 at the same pressure as that arriving at the inlet mouth, and therefore without loss of pressure in the route inside of the injector 10.
  • the control valve 32 is activated and the control channel 30 is open allowing the fuel to escape, the pressure in the control chamber having fallen sharply so that the pressure in the nozzle 16 prevails.
  • the fuel pressure at the nozzle exerts on the needle an axial F1 force directed upwards so that the needle 18 is held "up”.
  • the piston 44 bears against the ceiling of the control chamber 22, the volume of the second control chamber 52 is thus minimized.
  • the ball 56 biased by the spring 58 closes the filling channel 40.
  • the transient phase from the open nozzle position to the closed nozzle position is now described. From the open nozzle position, the control valve 32 is activated to close the control channel 30. From this moment, the pressurized fuel C enters the first channel 28 into the control chamber 22, now called the first chamber 22 and in the second control through the calibrated orifice 38 and the filling channel 40. The pressure in the chamber 22 increases sharply to reach the inlet pressure value 14. The pressurized fuel in the first control chamber 22 and the second control chamber 52 exert a force on the axial end of the needle pointing towards the nozzle. The pressure in the second control chamber 52 is equal to the pressure at the inlet of the injector.
  • This force F2 initiates the movement of the needle 18 because the pressure is exerted on the upstream of the needle, to which is added the force F3 exerted in the second chamber 52 facing downwards.
  • the sum of the two forces F2 and F3 comes to oppose the force F1 which is exerted on the downstream end of the needle and oriented upwards.
  • the sum of the forces F2 and F3 are greater than the force F1 and thus the needle goes down.
  • the volume of the second control chamber increases there creating a pressure drop,
  • the ball 56 moves away from the seat 60 so that the fuel C pressurized easily enters the second control chamber through the filling channel 40 now open.
  • the movement of the needle 18 downwards is accelerated until the needle 18 is in abutment in the closed nozzle position PF.
  • the closed nozzle position PF is now described.
  • the control channel is always closed and the pressure in the first control chamber is at the inlet pressure.
  • the piston 44 is still resting against the ceiling of the first control chamber 22 and the needle is down in the closed nozzle position and the volume of the second control chamber 52 is now maximized.
  • the ball 56 has moved back against the seat 60, closing the filling channel 40.
  • the pressure in the second control chamber 52 is then identical to the inlet pressure.
  • the transient phase from the closed nozzle position to the open nozzle position is now described. From the closed nozzle position PF, the control valve 32 is activated to open the control channel 30. The fuel C that can escape from the first control chamber 22 is thereby decreasing the pressure. The needle 18 is subject only to the axial force F1 directed upwards and due to the pressure of the fuel at the nozzle 16, this force F1 largely prevails over a small force F3 opposite exerted by the fuel prisoner in the second control chamber 52 and now the ball against the seat and the needle 18 moves upwards. In this movement the volume of the second chamber 52 decreases and the fuel C escapes through the calibrated orifice 38.
  • the output of the fuel is limited by the small section of the calibrated orifice 38, thereby limiting the rate of rise of the needle 18.
  • the needle moving to be in the up position as previously described.
  • the role of the calibrated orifice 38 therefore clearly appears as a retarder of the rise of the needle.
  • an alternative construction could replace the calibrated orifice 38 with any other valve solution.
  • the piston 44 is in permanent contact with the thick plate 26 and could be fixed or integrated therewith.
  • a piston attached to the plate would create a hyperstatic axial guidance of the needle already guided in the body at the bottom. It is therefore interesting to keep the piston a degree of transverse freedom.
EP13177670.0A 2013-07-23 2013-07-23 Kraftstoffeinspritzer Withdrawn EP2829717A1 (de)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP13177670.0A EP2829717A1 (de) 2013-07-23 2013-07-23 Kraftstoffeinspritzer
PCT/EP2014/065637 WO2015011097A1 (fr) 2013-07-23 2014-07-21 Injecteur de carburant
EP14748145.1A EP3025049B1 (de) 2013-07-23 2014-07-21 Kraftstoffeinspritzer
US14/906,635 US20160153412A1 (en) 2013-07-23 2014-07-21 Fuel injector
CN201480041760.5A CN105408615B (zh) 2013-07-23 2014-07-21 燃料喷射器
KR1020167001335A KR20160033108A (ko) 2013-07-23 2014-07-21 연료 인젝터

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13177670.0A EP2829717A1 (de) 2013-07-23 2013-07-23 Kraftstoffeinspritzer

Publications (1)

Publication Number Publication Date
EP2829717A1 true EP2829717A1 (de) 2015-01-28

Family

ID=48803481

Family Applications (2)

Application Number Title Priority Date Filing Date
EP13177670.0A Withdrawn EP2829717A1 (de) 2013-07-23 2013-07-23 Kraftstoffeinspritzer
EP14748145.1A Not-in-force EP3025049B1 (de) 2013-07-23 2014-07-21 Kraftstoffeinspritzer

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP14748145.1A Not-in-force EP3025049B1 (de) 2013-07-23 2014-07-21 Kraftstoffeinspritzer

Country Status (5)

Country Link
US (1) US20160153412A1 (de)
EP (2) EP2829717A1 (de)
KR (1) KR20160033108A (de)
CN (1) CN105408615B (de)
WO (1) WO2015011097A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017097777A1 (fr) * 2015-12-11 2017-06-15 Delphi International Operations Luxembourg S.À R.L. Injecteur de carburant
FR3080891A1 (fr) * 2018-05-03 2019-11-08 Delphi Technologies Ip Limited Injecteur de carburant pour moteur a combustion interne

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0711996A (ja) * 1993-06-25 1995-01-13 Hino Motors Ltd ディーゼルエンジンの燃焼制御装置
JP2000329024A (ja) * 1999-05-21 2000-11-28 Isuzu Motors Ltd ニードル弁のリフトダンパー
EP1335125A1 (de) * 2000-11-17 2003-08-13 Isuzu Motors Limited Nadelhubdämpfer eines injektors für brennstoffeinspritzung und dämpfungsverfahren
EP2295784A1 (de) * 2009-08-26 2011-03-16 Delphi Technologies Holding S.à.r.l. Kraftstoffeinspritzdüse

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT500774B8 (de) * 2004-08-06 2007-02-15 Bosch Gmbh Robert Vorrichtung zum einspritzen von kraftstoff in den brennraum einer brennkraftmaschine
DE102007011789A1 (de) * 2007-03-12 2008-09-18 Robert Bosch Gmbh Kraftstoffinjektor
DE102010039048A1 (de) * 2010-08-09 2012-02-09 Robert Bosch Gmbh Einspritzvorrichtung
JP5817460B2 (ja) * 2011-11-18 2015-11-18 トヨタ自動車株式会社 内燃機関の燃料噴射装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0711996A (ja) * 1993-06-25 1995-01-13 Hino Motors Ltd ディーゼルエンジンの燃焼制御装置
JP2000329024A (ja) * 1999-05-21 2000-11-28 Isuzu Motors Ltd ニードル弁のリフトダンパー
EP1335125A1 (de) * 2000-11-17 2003-08-13 Isuzu Motors Limited Nadelhubdämpfer eines injektors für brennstoffeinspritzung und dämpfungsverfahren
EP2295784A1 (de) * 2009-08-26 2011-03-16 Delphi Technologies Holding S.à.r.l. Kraftstoffeinspritzdüse

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017097777A1 (fr) * 2015-12-11 2017-06-15 Delphi International Operations Luxembourg S.À R.L. Injecteur de carburant
FR3045109A1 (fr) * 2015-12-11 2017-06-16 Delphi Int Operations Luxembourg Sarl Injecteur de carburant
CN108474339A (zh) * 2015-12-11 2018-08-31 德尔福知识产权有限公司 燃料喷射器
FR3080891A1 (fr) * 2018-05-03 2019-11-08 Delphi Technologies Ip Limited Injecteur de carburant pour moteur a combustion interne

Also Published As

Publication number Publication date
WO2015011097A1 (fr) 2015-01-29
CN105408615B (zh) 2017-12-12
CN105408615A (zh) 2016-03-16
EP3025049A1 (de) 2016-06-01
EP3025049B1 (de) 2017-05-17
US20160153412A1 (en) 2016-06-02
KR20160033108A (ko) 2016-03-25

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