EP3655643B1 - Vorrichtung zum steuern eines injektors - Google Patents

Vorrichtung zum steuern eines injektors Download PDF

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Publication number
EP3655643B1
EP3655643B1 EP18745562.1A EP18745562A EP3655643B1 EP 3655643 B1 EP3655643 B1 EP 3655643B1 EP 18745562 A EP18745562 A EP 18745562A EP 3655643 B1 EP3655643 B1 EP 3655643B1
Authority
EP
European Patent Office
Prior art keywords
valve
connection
injector
accordance
space
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
EP18745562.1A
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German (de)
English (en)
French (fr)
Other versions
EP3655643A1 (de
Inventor
Norbert SCHÖFBÄNKER
Verena KÖGEL
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.)
Liebherr Components Deggendorf GmbH
Original Assignee
Liebherr Components Deggendorf 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
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Publication of EP3655643A1 publication Critical patent/EP3655643A1/de
Application granted granted Critical
Publication of EP3655643B1 publication Critical patent/EP3655643B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0045—Three-way valves
    • 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
    • F02M63/0056—Throttling valves, e.g. having variable opening positions throttling the flow
    • 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
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0075—Stop members in valves, e.g. plates or disks limiting the movement of armature, valve or spring
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member

Definitions

  • the present invention relates to a device for controlling an injector which can be used, for example, as a fuel injection valve.
  • An injector has a nozzle needle (also: injector needle), which allows fuel that has been subjected to high pressure to emerge to the outside when an outlet hole of the injector is released.
  • this nozzle needle acts like a plug which, when lifted, causes the fuel allows. Accordingly, it is therefore necessary to raise this needle at relatively short time intervals and, after a short time, to let it slide back into the outlet opening again.
  • Hydraulic servo valves controlled by electromagnetic valves are used to trigger the movement of this nozzle needle. The servo valves are required for the controlled opening and closing of the nozzle needle. This makes it possible to determine the start of injection, the duration of injection and the end of injection.
  • servo valves which control the nozzle needle and are themselves controlled via an electromagnetic valve.
  • a pressure level is built up in a control chamber which interacts with the nozzle needle with the aid of the fuel which is available under high pressure and which acts on the nozzle needle in the closing direction.
  • This control chamber is typically connected to the high-pressure area of the fuel via an inlet throttle.
  • this control chamber has a small closable outlet throttle from which the fuel can escape. If he does this, the pressure in the control chamber and the closing force acting on the nozzle needle are reduced. This causes the nozzle needle to move, which opens the outlet opening at the injector tip.
  • the servo valve includes the inlet throttle, the control chamber and the outlet throttle.
  • the outlet throttle of the control chamber is selectively closed or opened with the aid of an electromagnetic valve or another suitable valve.
  • the controlled opening of this outlet throttle in combination with the inlet throttle increases the pressure in the control room of the valve. As explained briefly above, this pressure is then responsible for the opening and closing of the nozzle needle.
  • a known from the prior art fuel injection valve with all the features of the preamble of claim 1 shows the DE 10 2015 113 980 A1 .
  • the aim of the present invention is to optimize the opening and closing of the nozzle needle independently of one another.
  • the valve is designed to create a direct connection between the high-pressure side and the control chamber when the pressure level in the passage chamber is equal to or greater than a predetermined value or when a specific ratio of the pressure in the control chamber to the Pressure in the passage space is fallen below.
  • valve described herein can be the servo valve considered in more detail in the introductory part of the description.
  • the valve of the present invention responds differently.
  • the pressure in the closed passage space increases through the inlet via the first connection, the valve is designed to create a direct connection between the high-pressure area of the fuel and the control space.
  • the injection quantity of the fuel can be better determined since the transition phase of the injector from an open to a closed state in which no fuel is discharged through the injector is faster.
  • the direct connection between the high-pressure area and the control chamber preferably does not run via the through-chamber. Rather, the direct connection is a coupling of the fuel, which is under high pressure, to the control chamber.
  • the first connection is provided with the aid of an inlet throttle, which represents a throttled connection from the passage space to the high-pressure area of the injector, this connection preferably being present independently of a state of the valve.
  • passage space is not closed, i.e. the anchor element is not placed on an opening of the passage space, fluid under high pressure (such as fuel) escapes in the direction of the low-pressure area released by the anchor element, so that a continuous inflow through the inlet throttle also results in a pressure decrease in the passage space or in the control room cannot counteract in such a state.
  • high pressure such as fuel
  • the valve is also designed to create the direct connection between the high-pressure area and the control space only when the pressure level in the passage space is equal to or greater than a predetermined value, whereas otherwise this connection is closed.
  • the direct connection between the high-pressure area of the injector and the control chamber is therefore only established by the valve when a specific pressure level has been reached in the through-chamber. If, due to the connection of the control chamber to the high-pressure area, the pressure level in the control chamber has equalized that of the passage chamber, the valve is optionally designed to close the direct connection again.
  • the valve is designed to create a direct connection between the high-pressure side and the control chamber when the pressure level in the passage chamber is equal to or greater than a predetermined value, this predetermined value being based on a difference in pressure between the passage room and the control room.
  • a predetermined value being based on a difference in pressure between the passage room and the control room.
  • the valve establishes the direct connection when the pressure in the passage space is greater than a pressure prevailing in the control space.
  • the second connection is a throttled connection and/or the direct connection is an unthrottled connection.
  • a throttled connection is understood to mean that a fluid flowing through such a line is restricted in its flow, so that a pressure equalization via such a throttled connection takes a certain amount of time.
  • an unthrottled connection it is assumed that there are no flow obstacles for the fluid in order not to prevent pressure equalization of the fluid via such a connection.
  • the valve comprises a valve guide, which is arranged between the other of the two sides of the passage space and the control space, and a valve insert, which is slidably mounted in the valve guide.
  • the valve guide has a channel which, in a first position of the sliding valve insert in the Valve guide does not produce a direct fluid connection between the high-pressure region and the control chamber and produces a direct fluid connection between the high-pressure region and the control chamber in a second position of the displaceable valve insert in the valve guide. Accordingly, there is no direct connection between the high-pressure area and the control chamber in the first position of the valve insert. A particularly simple implementation of the valve is thus achieved.
  • valve insert moves at least temporarily into the second position, as a result of which the two control spaces are separated.
  • valve insert moves into the first position when the pressure level in the passage space falls below a predetermined level.
  • the valve insert moves into the first position when a pressure difference between the passage space and the control space falls below a predetermined value. For example, when the pressure in the control chamber is higher than the pressure level in the passage chamber, the valve insert can be moved into the first position.
  • the movement of the valve insert occurs automatically due to the different pressures in the control chamber and the passage chamber, since these exert a certain force on the valve insert on the respective side of the valve insert (side in the passage chamber or side in the control chamber) and this corresponds to the prevailing pressure levels in the A shift in one direction can be made in connection with the effective pressure area of the valve insert.
  • it also has a stop element which increases the stroke of the valve insert during a movement limited from the first layer to the second layer. This makes it possible to make the manufacturing tolerances on the components more generous and to reduce the costs of the claimed device overall.
  • the stop element limiting the stroke of the valve insert brings about the advantageous circumstance that the return path of the valve insert into the first position is reduced, so that activation of the valve can be achieved more quickly during the next injection.
  • the stop element is a disc-shaped body that has one or more through openings.
  • stop element is attached to the valve guide, preferably welded.
  • stop element it is possible for the stop element to be arranged in the control chamber or on the side of the valve guide pointing towards the control chamber.
  • the optional provision of at least one through-opening in the stop element serves for the fuel to flow through to the control chamber or to the second connection.
  • the device also has a restoring element which applies a force to the valve insert which forces it from the second position into the first position.
  • a restoring element which applies a force to the valve insert which forces it from the second position into the first position.
  • the restoring element is an elastic element, preferably a spring or a spiral spring, which the valve insert with a certain force in the first position.
  • the elastic element is preferably arranged on a side of the valve insert that faces the control chamber.
  • the valve is preferably a 3/2-way valve because, compared to the 2/2-way valves used in the prior art, it has an additional fuel channel in the high-pressure area of the injector, which has a direct fluid connection to the control chamber in a specific state of the valve.
  • FIG. 1 shows a partial sectional view of a schematic representation of an injector 2.
  • the movable injector needle 6 which can be moved in the direction of the valve 7 arranged above it. If the injector needle 6 is moved toward the valve 7, fuel flows out at the end of the injector (not shown). In the other case, in which the injector needle 6 is arranged in its place away from the valve 7, no fuel flows out of the injector 2.
  • a control chamber 5 Located in the direct vicinity of the injector needle 6 between the valve 7 is a control chamber 5 in which a variable pressure can be generated.
  • the valve 7 with its through-opening 3 is directly connected to the closure member or anchor element 4, which can close the through-opening 3 in a fluid-tight manner. A certain pressure is required for this, which forces the anchor element 4 in the direction of the through-opening 3 . This is achieved with the help of the spring interacting with the anchor element 4 . If one now wants to lift the armature element 4 from the through-opening 3 so that there is a pressure change in the through-opening 3 or the control chamber 5, a force pulling the armature element 4 away from the through-opening 3 is generated with the aid of an electromagnet.
  • An inner magnet pole 23 and an outer magnet pole 22 are provided in the injector housing 21, which together with a coil form an electromagnet for controlling the closure element.
  • FIG 2 shows an enlarged view of the device 1 according to the invention, in particular of the valve 7.
  • the sealing seat 41 ensures a tight connection.
  • a passage opening 32 is accordingly closed with the aid of the anchor element 4 .
  • the passage space 3 also has an inlet throttle 8 which allows fuel under high pressure to flow into the passage space 3 .
  • the valve insert 72 is arranged such that it can move relative to the valve guide 71 . When certain pressures are present in the control chamber 5 or the passage chamber 3, the valve insert 72 can accordingly be moved toward or away in the direction of the passage opening 3.
  • Figure 3a shows the state in which the pilot valve, ie the opening of the armature element 4 with respect to the through opening 3, is in a closed state and accordingly the injector 2 does not inject fuel.
  • the through opening is provided in what is known as a seat plate 31 .
  • the anchor element 4 separates the high-pressure area HP from the low-pressure area of a fuel.
  • FIG. 12 shows a state in which the pilot valve is open and injection is made by the injector 2.
  • Opening the pilot valve means that the armature element 4 is raised, so that fuel can flow from the high-pressure area HP to the low-pressure area LP out of the passage space 3 . Accordingly, lifting the anchor element 4 enables a direct fluid connection between the passage space 3 and the area surrounding the anchor element 4 . Accordingly, fuel flows out of the passage space 3 in the direction of the anchor element 4. This also means that the fuel in the control space 5 under high pressure flows through the discharge throttle 9 towards the low-pressure area of the injector due to the existing pressure difference. This leads to a pressure reduction above the injector needle 6, as a result of which the resulting reduction in the pressure on the injector needle body 6 leads to the injector needle 6 being lifted out of its nozzle seat and an injection taking place.
  • the inlet throttle 8 and the outlet throttle 9 and the passage space 3 are dimensioned so that the processes described take place.
  • 3c shows the state in which the pilot valve is just closing and injection from the injector 2 is still present.
  • 3d shows a state in which the pilot valve is closed, the injector needle 6 closes and the injection of the injector 2 is terminated.
  • Fig.3d also a sectional view of the figs 3a-3c discussed area, however, in 3d shown a different section plane to better represent the features of the invention.
  • the anchor element 4 has only just been brought into a sealing position relative to the opening of the passage space 3 , so that fuel which is under high pressure now flows into the passage space 3 via the inlet throttle 8 .
  • the pressure level in the passage space 3 thus increases, so that due to the very high pressure in the passage space 3 compared to the control chamber 5, a movement of the valve insert 72 away from the passage space 3 is generated. This movement creates a direct, throttle-free connection from the high-pressure area HP of the fuel to the control chamber 5.
  • FIG. 12 shows a sectional view of another embodiment of the present invention.
  • a spiral spring 13 can be seen, which is used to return the valve insert 72 to its starting position after an injection. If the pressure in the control chamber is equal to the pressure prevailing in the high-pressure area, the valve insert 72 does not remain in the position in which there is a fluid connection through the channel 10 provided in the valve guide, but is returned to its initial position with the aid of the spring 13 . This brings with it the advantage that the valve insert 72 does not first have to overcome the valve lift when the next injection is activated, and the reaction time of the injector is shortened as a result.
  • FIG. 13 shows another embodiment of the present invention, in which a stop member 11 in the form of a disc-shaped body is provided to limit the stroke of the valve core 72.
  • the stop member 11 is attached to the valve guide 71 by laser welding.
  • the stop element 11 the manufacturing tolerances on the components can be made more generous.
  • the stop element 11 has through openings 12 which are used to allow fuel to flow through the stop element 11 .
  • valve guide 71 shows four different embodiments for the outer shape of the valve guide 71. If this is now inserted into a bore which is flush with the circular outer sections of the valve guide 71, the flattened sections can serve to guide fuel past the side of the sleeve.
  • Fig.7 shows a top view of two stop elements 11 that can be used to limit the stroke of the valve insert 72. It can be seen that each of the two stop elements 11 has at least one through opening 12.
  • the function of two components is combined in one component.
  • the blank of the valve 7 is preferably designed as MIM (Metal Injection Molding) and already has all the bores except for the outlet throttle 9 and the inlet throttle 8, which are subsequently eroded.
  • a metal injection molding process is a manufacturing process in which a green body is produced by injection molding and then sintered in a furnace. As a result, very complex component geometries can be implemented cost-effectively and machining on the component can be reduced to a minimum.

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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)
EP18745562.1A 2017-07-20 2018-07-20 Vorrichtung zum steuern eines injektors Active EP3655643B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017116367.0A DE102017116367A1 (de) 2017-07-20 2017-07-20 Vorrichtung zum Steuern eines Injektors
PCT/EP2018/069838 WO2019016399A1 (de) 2017-07-20 2018-07-20 Vorrichtung zum steuern eines injektors

Publications (2)

Publication Number Publication Date
EP3655643A1 EP3655643A1 (de) 2020-05-27
EP3655643B1 true EP3655643B1 (de) 2022-05-11

Family

ID=63013022

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18745562.1A Active EP3655643B1 (de) 2017-07-20 2018-07-20 Vorrichtung zum steuern eines injektors

Country Status (6)

Country Link
US (1) US11608805B2 (zh)
EP (1) EP3655643B1 (zh)
CN (1) CN111051681B (zh)
DE (1) DE102017116367A1 (zh)
ES (1) ES2921909T3 (zh)
WO (1) WO2019016399A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3990770A1 (de) 2019-06-25 2022-05-04 Ganser-Hydromag AG Brennstoffeinspritzventil für verbrennungskraftmaschinen

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19823937B4 (de) * 1998-05-28 2004-12-23 Siemens Ag Servoventil für Kraftstoffeinspritzventil
DE10131619A1 (de) 2001-06-29 2003-01-23 Bosch Gmbh Robert Kraftstoffinjektor mit Einspritzverlaufsformung
DE10212396A1 (de) * 2002-03-20 2003-10-09 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung mit 3/2-Wege-Ventil
DE102004028195A1 (de) 2004-06-09 2005-12-29 Volkswagen Mechatronic Gmbh & Co. Kg Einspritzventil mit Schließdruckbeaufschlagung der Ventilnadel
DE102004028885A1 (de) 2004-06-15 2006-01-05 Robert Bosch Gmbh Kraftstoffeinspritzventil
US8544771B2 (en) * 2006-03-03 2013-10-01 Ganser-Hydromag Ag Fuel injection valve for internal combustion engines
US8224518B2 (en) 2008-08-18 2012-07-17 Trimble Navigation Limited Automated recordation of crane inspection activity
EP2583262A1 (en) 2008-10-27 2013-04-24 Scot I. Williams Wind turbine inspection
JP5732834B2 (ja) 2010-03-31 2015-06-10 株式会社デンソー 燃料噴射装置
DE102012202538A1 (de) 2012-02-20 2013-08-22 Robert Bosch Gmbh Kraftstoffinjektor
DE102012209841A1 (de) 2012-06-12 2013-12-12 Robert Bosch Gmbh Injektor für ein Fluid, insbesondere Kraftstoffinjektor
DE202012012116U1 (de) 2012-12-17 2014-03-19 Liebherr-Components Biberach Gmbh Turmdrehkran
US20160031680A1 (en) 2014-07-31 2016-02-04 Trimble Navigation Limited Crane productivity coordination
GB201414669D0 (en) 2014-08-19 2014-10-01 Delphi International Operations Luxembourg S.�.R.L. Control valve arrangement
DE102015113980A1 (de) * 2014-09-02 2016-03-03 Denso Corporation Kraftstoffeinspritzventil
GB201517148D0 (en) 2015-09-29 2015-11-11 Delphi Int Operations Lux Srl Fuel injector

Also Published As

Publication number Publication date
US11608805B2 (en) 2023-03-21
EP3655643A1 (de) 2020-05-27
CN111051681B (zh) 2022-04-19
US20200271080A1 (en) 2020-08-27
CN111051681A (zh) 2020-04-21
WO2019016399A1 (de) 2019-01-24
ES2921909T3 (es) 2022-09-02
DE102017116367A1 (de) 2019-01-24

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