EP3183450B1 - Control valve arrangement - Google Patents

Control valve arrangement Download PDF

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Publication number
EP3183450B1
EP3183450B1 EP15729168.3A EP15729168A EP3183450B1 EP 3183450 B1 EP3183450 B1 EP 3183450B1 EP 15729168 A EP15729168 A EP 15729168A EP 3183450 B1 EP3183450 B1 EP 3183450B1
Authority
EP
European Patent Office
Prior art keywords
valve
filling
fluid communication
chamber
stem
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.)
Active
Application number
EP15729168.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3183450A1 (en
Inventor
Mark Smith
Celia Soteriou
Michael Cooke
Martin Hardy
Andrew Hargreaves
Adrian Tolliday
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
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Publication date
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Publication of EP3183450A1 publication Critical patent/EP3183450A1/en
Application granted granted Critical
Publication of EP3183450B1 publication Critical patent/EP3183450B1/en
Active 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
    • 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
    • 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
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0035—Poppet valves, i.e. having a mushroom-shaped valve member that moves perpendicularly to the plane of the valve seat

Definitions

  • the present invention relates to a fuel injector such as a diesel injector, and more specifically to a control valve arrangement for a fuel injector.
  • High pressure fuel injectors are provided with a needle or shaft which is hydraulically piloted via a control valve arrangement. It is known that to minimize undesirable exhaust emissions the lift of the needle must happen at a controlled speed while the closing must be extremely prompt.
  • a fuel injector control valve arrangement comprises a separate filling valve which is operated by a hydraulic servo driven by a two-way control valve.
  • This provides a three-way valve function, with the advantage that the filling valve can have a large flow area and therefore drive the nozzle needle closed quickly.
  • this embodiment is not suitable for higher inter-valve volumes, which may be required for example to simplify manufacture, as larger volumes take longer to re-pressurise, thereby resulting in steep gain curves for small injections.
  • the present invention comprises a control valve arrangement of a fuel injector comprising a valve housing wherein are arranged a filling channel extending from a high pressure fuel supply line to a filling chamber, the filling chamber being in a first fluid communication with a first control chamber, wherein the first fluid communication is controlled by a filling valve normally biased open by a first spring, away from a first seat arranged in the valve housing, and a communication channel extending from the first control chamber to a second control chamber which is in a second fluid communication with a low pressure outlet line, wherein the filling valve comprises a stem, a guiding section of which is located within a guide portion of the valve housing; wherein the second fluid communication is controlled by a control valve normally biased in a closed position by a second spring, in complementary abutment against a second seat arranged in the housing, the control valve cooperating with an actuator to move from the normally closed position to an open position and, a bore in which a piston is slidably arranged, the piston piloting the injection
  • the fourth fluid communication may comprise a channel provided between the stem of the filling valve and the guide portion of the valve housing.
  • the filling valve additionally comprises an elongate groove, wherein a close clearance is maintained between the guiding section of the stem and the guide portion of the valve housing at regions either side of the groove, wherein the fourth fluid communication comprises clearance between the groove and the guide portion of the valve housing and leak paths between the regions either side of the groove and the guide portion of the valve housing.
  • the present invention comprises a fuel injector wherein a movable needle cooperates with a nozzle to enable or prohibit fuel injection, the needle being hydraulically piloted by a control valve arrangement in accordance with any one of the preceding paragraphs.
  • the invention is also related to a fuel injector wherein a movable needle cooperates with a nozzle to enable or prohibit fuel injection, the needle being hydraulically piloted by a control valve arrangement as described in the preceding paragraphs.
  • the present invention provides a fuel injector such as a Piezo injector, wherein an additional fluid flow path is provided from a high pressure supply to an inter-valve volume, i.e. a volume between a control valve and filling valve.
  • a fuel injector such as a Piezo injector
  • an additional fluid flow path is provided from a high pressure supply to an inter-valve volume, i.e. a volume between a control valve and filling valve.
  • a first embodiment as illustrated in Figures 1a to 1c , comprises a fuel injector 10 comprising a control valve arrangement 12.
  • the fuel injector further comprises a needle guide housing 14 in which a needle 16 is slidable within a bore 18 and engageable with a needle seat (not shown), to control a flow of fuel from a high pressure supply line 20, through the needle guide housing 14.
  • valve housing 22 comprising a through hole extending along a vertical valve axis A2, which is slightly offset relative to a main vertical axis A1.
  • the through hole comprises several coaxial sections as described below from bottom to top.
  • a first through hole section comprises a first control chamber 24, and a first frustoconical valve seat 26, above which is provided a filling chamber 28, defined by a wall 30. Above the filling chamber 28 is provided a cylindrical guide portion 32, which restricts at the top to form a second frustoconical valve seat 34. A central aperture of the second valve seat 34 opens into a large low pressure chamber 36, from which is connected a low pressure line 38.
  • the offset of the axis A2 from axis A1 i.e. the offset of the bore 18 from the through hole, is such that an unrestricted fluid communication is enabled between the bore 18 and the first control chamber 24.
  • a first poppet valve comprising a filling valve 40, is arranged so as to cooperate with the first valve seat 26.
  • the filling valve 40 comprises a disc-plug portion 42, a stem 44 which extends axially upwardly from the disc-plug portion 42, and a groove 43 between the disc-plug portion 42 and the stem 44.
  • Part of the stem 44 is contained within the guide portion 32 of the valve housing 22; this part of the stem 44 acts as a guide, thereby guiding the filling valve 40 within a guide clearance between the guide portion 32 and the filling valve 40.
  • a coil spring 46 is provided in the filling chamber 28, the coil spring 46 being compressed between a top portion of wall 30 and an upper face of the disc-plug portion 42. The coil spring 46 maintains the filling valve 40 in an open position away from the first valve seat 26.
  • the filling valve 40 is further provided with an internal axial communication channel 48 extending throughout the filling valve 40 from a lower face of the disc-plug portion 42 to a top surface 50 of the stem 44.
  • the communication channel 48 comprises an upper section 48a and a lower section 48b, the upper and lower sections 48a, 48b being separated by restriction provided by a spill orifice 52.
  • the communication channel 48 opens downwardly into the first control chamber 24 and also into the bore 18.
  • a lift stop 54 is provided on the lower face of the disc-plug portion 42; the lift stop 54 abuts a top face of the needle guide housing 14 when the filling valve 40 opens, thereby to limit the range of displacement of the filling valve 40.
  • a second poppet valve comprising a control valve 56, is arranged above the filling valve 40, so as to cooperate with the second valve seat 34.
  • the control valve 56 comprises a disc-plug portion 58 and a stem 60, which extends upwardly into the low pressure chamber 36.
  • a spring 62 is provided in the low pressure chamber 36 around the stem 60; the spring 62 maintains the control valve 56 in a closed potion, wherein the disc-plug portion 58 is in abutment with the second valve seat 34.
  • An actuator such as a piloted actuator, cooperates with the control valve 56, to provide a downward force to, and thereby open, the control valve 56, by pushing it away from the second valve seat 34.
  • a second control chamber 68 is defined within the guide portion 32, between the filling valve stem 44 and the control valve 56.
  • the second control chamber 68 thereby defines an inter-valve volume.
  • a filling channel 70 extends from the supply line 20.
  • a further restriction orifice 72 is provided between the filling channel 70 and the filling chamber 28, such that the restriction orifice 72 opens in the wall 30 of the filling chamber 28.
  • a first phase of operation of the fuel injector 10 injection of fuel is prevented as the needle 16 is in a downward position and in abutment against the needle seat.
  • the actuator 66 is not energised, and therefore the control valve 56 is in a closed position and the filling valve 40 in an open position.
  • a continuous fluid communication is established between the high pressure line 20 and the second control chamber 68, via the filling channel 70, restriction orifice 72, the filling chamber 28, the first control chamber 24, the communication channel 48. This volume is filled with high pressure fuel; maintaining the needle 16 in the downward position.
  • An additional fluid communication flow path is provided between the high pressure line 20 and the second control chamber 68; this additional flow path is described below.
  • an injection event to eject fuel into a compression chamber (not shown) is initiated by energising of the actuator 66, thereby to push the control valve 56 downwardly to an open position.
  • High pressure fuel inside the second control chamber 68 flows into the low pressure chamber 36, causing depressurisation of the second control chamber 68 and thereby urging the filling valve 40 into a closed position, thereby interrupting the fluid communication described above.
  • High pressure fuel in first control chamber 24 flows through the communication channel 48, the velocity of the fuel flow being limited by the spill orifice 52, thereby decreasing the pressure of the flow through the communication channel 48.
  • the pressure in the first control chamber 24 decreases and the needle 16 moves upwardly at a controlled speed.
  • the actuator 66 is subsequently de-energised, thereby ending the second phase of operation.
  • the spring 62 urges the control valve 56 upwardly, thereby closing it against the second valve seat 34.
  • the coil spring 46 and high pressure fuel in the filling chamber 28 cause the filling valve 40 to open, thereby re-establishing full volume in the fluid communication described above. Re-pressurisation of the fuel in this volume acts to push the needle 16 towards the closing needle seat, thereby ending the injection event.
  • the further restriction orifice 72 acts to damp any hydraulic wave activity in the high pressure line 20 and the filling channel 70.
  • the additional flow path comprises a clearance channel 100 defined by a guide clearance between the stem 44 of the filling valve 40 and the guide portion 32 of the valve housing 22, which is increased in comparison to prior art embodiment, i.e. the guide clearance is increased sufficiently to allow fluid flow between the stem 44 and the guide portion 32.
  • the clearance channel 100 extends between the filling chamber 28 and the second control chamber 68. Therefore in the present embodiment, an additional flow of fuel is enabled from the high pressure line 20 to the second control chamber 68, via the filling channel 70, the restriction orifice 72, the filling chamber 28, and the clearance channel 100.
  • the second control chamber 68 i.e. the inter-valve volume, is therefore able to fill and re-pressurise more quickly than in prior art embodiments, thereby avoiding steep gain curves for small injections, particularly where a large inter-valve volume is provided, for example for ease of manufacture.
  • a circumferential elongate groove 205 is provided on the stem 44.
  • a close clearance is maintained between the stem 44 and the guide portion 32, in regions 230, above and below (i.e. either side of) the groove 205.
  • the distance over which the groove 205 extends is sufficiently long, to limit the length over which the close-clearance regions 230 extend, to ensure that the leakage is enabled between the stem 44 and guide portion 32 at the close-clearance regions 230.
  • the additional flow path in this embodiment therefore is similar to that of the first embodiment, however instead of channel 100, the flow path comprises a clearance between the stem 44 and the guide portion 32 along the length of the groove 205, and the two leak paths which are enabled at close-clearance regions 230.
  • the guiding of the filling valve 40 is improved compared to that of the first embodiment. This improved guiding results in a reduction in shot-to-shot variations which could be caused by the filling valve 40 moving radially within the clearance between the filling valve 40 and the valve housing 22.
  • At least one flat 306 is provided along the length of the stem 44 of the filling valve 40.
  • the additional flow path therefore includes a channel 300, which is defined by the clearance between the flat 306 and the guide portion 32.
  • the guiding of the filling valve 40 within the clearance between the filling valve 40 and the guide portion 32 is again improved in comparison to the first embodiment, as a close clearance is maintained between the stem 44 and the guide portion 32 around the non-flat area of the stem 44.
  • the third embodiment is less sensitive to fuel viscosity (and therefore temperature) than the first and second embodiments, due to the reduced viscosity sensitivity of a flat compared to that of a guide leakage.
  • a fourth embodiment as illustrated in Figures 4a to 4c comprises, in common with the third embodiment, at least one flat 406, and additionally comprises a localised ridge 407 provided on the flat 406, such that the flat 406 is separated into two portions, 406a and 406b.
  • the resulting channel 400 acts more like an orifice than the earlier embodiment due to the ridge 406.
  • the fourth embodiment therefore has a further reduced sensitivity to fuel viscosity and therefore temperature.
  • a bypass orifice is provided, which opens into the communication channel 48.
  • a bypass orifice 510 is drilled through the filling valve 40, in the guiding region of the stem 44. At least one flat 506 is provided, only to ensure that the bypass orifice 510 can be drilled upstream of, i.e. above, the spill orifice 52.
  • the additional flow path between the high pressure line 20 and the second control chamber 68 in the fifth embodiment is therefore enabled via the filling channel 70, the restriction orifice 72, the filling chamber 28, a clearance channel 500 (between the flat 506 and the guide portion 32), the bypass orifice 510, and the upper section 48a of the communication channel 48.
  • sensitivity to fuel viscosity is further reduced.
  • a sixth alternative embodiment as illustrated in Figures 6a to 6c , is similar to the fifth embodiment, however the bypass orifice 610 is drilled into a circumferential groove 620 provided in the stem 44 adjacent a flat 606. Compared to the fifth embodiment, the additional flow path of the sixth embodiment therefore additionally comprises the groove 620.
  • circumferential alignment of the bypass orifice 610 is not critical (as it would be if it was drilled into the flat 606).
  • the spill orifice 52 is located lower down the communication channel 48 than in the earlier embodiments, at a point below the guide section of the stem 44, i.e. below the section of the stem 44 which is contained within the guide portion 32 of the valve housing 22.
  • the bypass orifice 710 of the seventh embodiment communicates the filling chamber 28 directly with the upper section 48a of the communication channel.
  • the bypass orifice 710 is drilled into a flat 706.
  • the drilling of the bypass orifice 710 into the filling valve 40 does not affect the guiding leakage of the stem 44/guide section 32.
  • the additional flow path between the high pressure supply line 20 and the second control chamber 68 in enabled via the filling channel 70, the restriction orifice 72, the filling chamber 28, the bypass orifice 710, and the upper section 48a of the communication channel 48.
  • the spill orifice 52 is located within the guide section of the stem 44, as in the first to sixth embodiments.
  • possible effects on the guide leakage are again avoided by drilling an angled bypass orifice 810 (i.e. the bypass orifice 810 is angled with respect to a radial axis R1 of the control valve arrangement), directly from the filling chamber 28 to the upper section 48a of the communication channel 48.
  • the additional flow path of the eighth embodiment is therefore the same as that of the seventh embodiment.
  • the angled bypass orifice 810 comprises a first section 812 and a second section 814 which is of a smaller cross-sectional area than the first section 812.
  • a ninth embodiment is a combination of certain features of the seventh and eighth embodiments.
  • the spill orifice 52 is in a lower position similarly to the seventh embodiment, and a bypass orifice 910 is again drilled directly from the filling chamber 28 to the upper section 48a of the communication channel 48, similarly to the eighth embodiment.
  • the bypass orifice 910 drilled into the groove section 43 of the filling valve 40, i.e. between the disc-plug portion 42 and the stem 44.
  • the bypass orifice 910 is drilled at an angle to a radial axis R1 of the control valve arrangement 12.
  • All embodiments as described above all provide an additional flow path between the high pressure line 20 and the second control chamber 68, which in each embodiment enables the second control chamber 68 to refill and re-pressurise more quickly than in prior art embodiments. All embodiments therefore avoid steep gain curves for small injections, particularly where a large inter-valve volume is present.

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  • 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)
EP15729168.3A 2014-08-19 2015-06-16 Control valve arrangement Active EP3183450B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1414669.0A GB201414669D0 (en) 2014-08-19 2014-08-19 Control valve arrangement
PCT/EP2015/063396 WO2016026595A1 (en) 2014-08-19 2015-06-16 Control valve arrangement

Publications (2)

Publication Number Publication Date
EP3183450A1 EP3183450A1 (en) 2017-06-28
EP3183450B1 true EP3183450B1 (en) 2018-08-15

Family

ID=51662614

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15729168.3A Active EP3183450B1 (en) 2014-08-19 2015-06-16 Control valve arrangement

Country Status (5)

Country Link
EP (1) EP3183450B1 (ko)
KR (1) KR102293596B1 (ko)
CN (1) CN106795841B (ko)
GB (1) GB201414669D0 (ko)
WO (1) WO2016026595A1 (ko)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3027350B1 (fr) * 2014-10-20 2019-10-04 Delphi Technologies Ip Limited Injecteur de carburant
DE102017116367A1 (de) * 2017-07-20 2019-01-24 Liebherr-Components Deggendorf Gmbh Vorrichtung zum Steuern eines Injektors
EP3990770A1 (de) * 2019-06-25 2022-05-04 Ganser-Hydromag AG Brennstoffeinspritzventil für verbrennungskraftmaschinen

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0107575D0 (en) * 2001-03-27 2001-05-16 Delphi Tech Inc Control valve arrangement
DE10333696A1 (de) * 2003-07-24 2005-02-24 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung
PT2093410E (pt) 2008-02-21 2014-05-26 Delphi Int Operations Luxembourg Sarl Injector de combustível com um sistema de controlo de válvula aperfeiçoado
DE102008001330A1 (de) * 2008-04-23 2009-10-29 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102011089130A1 (de) * 2011-12-20 2013-06-20 Robert Bosch Gmbh Kraftstoffeinspritzventil
DE102012202538A1 (de) * 2012-02-20 2013-08-22 Robert Bosch Gmbh Kraftstoffinjektor
JP5641035B2 (ja) * 2012-11-13 2014-12-17 株式会社デンソー 燃料噴射弁

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3183450A1 (en) 2017-06-28
CN106795841A (zh) 2017-05-31
CN106795841B (zh) 2019-11-12
KR102293596B1 (ko) 2021-08-26
WO2016026595A1 (en) 2016-02-25
GB201414669D0 (en) 2014-10-01
KR20170041882A (ko) 2017-04-17

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