EP3821117A1 - Injecteur de carburant et procédé pour faire fonctionner un injecteur de carburant - Google Patents

Injecteur de carburant et procédé pour faire fonctionner un injecteur de carburant

Info

Publication number
EP3821117A1
EP3821117A1 EP19736361.7A EP19736361A EP3821117A1 EP 3821117 A1 EP3821117 A1 EP 3821117A1 EP 19736361 A EP19736361 A EP 19736361A EP 3821117 A1 EP3821117 A1 EP 3821117A1
Authority
EP
European Patent Office
Prior art keywords
fuel
valve
fuel injector
chamber
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Withdrawn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
EP19736361.7A
Other languages
German (de)
English (en)
Inventor
Henning Kreschel
Christian Grimminger
Violaine Chassagnoux
Boerries BELKNER
Johannes UNRATH
Thomas Schwarz
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 EP3821117A1 publication Critical patent/EP3821117A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F02M63/0014—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
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0028—Valves characterised by the valve actuating means hydraulic

Definitions

  • the invention relates to a method for operating a fuel injector and a fuel injector which is set up to carry out the method.
  • the invention particularly relates to designs of a fuel injector for reducing low-pressure vibrations.
  • Fuel injectors are used in particular in common rail injection systems for injecting fuel into a combustion chamber of a diesel engine.
  • a fuel injector is known from DE 10 2010 028 011 A1, which has an improved high pressure resistance of the valve chamber.
  • Spray intervals are used. As a result, manifold overlapping pressure vibrations occur both in the high pressure area and in the
  • the method according to the invention comprises the step of reading a fuel under high pressure into an inlet channel and branching off a partial flow of the fuel under high pressure into a control chamber in which an axial end face of the nozzle needle is loaded with the pressure, so that the Nozzle needle is hydraulically loaded in the closing direction, the further step of opening a control valve, so that an outflow path downstream of the control valve in an outflow direction is released and fuel flows out of the control chamber in order to relieve the pressure on the nozzle needle, the fuel flowing off via the outflow path in at least two Partial streams is divided.
  • the volume of the outflow path is increased, so that an amplitude of the control surge resulting from the opening and closing movement is reduced. This leads to a lower impact energy, which reduces the potential for undershoots and avoids cavitation.
  • the low-pressure vibrations can be partially extinguished, so that the risk of cavitation is additionally reduced.
  • At least a partial flow of the fuel in the outflow path is conducted into an annular space on a radial outside of the valve plate.
  • annular space As an annulus, a hollow cylinder is used formed space understood, which is limited by the valve plate and a clamping nut surrounding the valve plate. This creates an additional volume space into which a partial flow of the fuel can flow off during the injection processes. Such an annular space reduces the impact energy during the injections, so that cavitation is reduced.
  • At least a partial flow of the fuel flows off in the outflow path via a structurally extended path.
  • a structurally extended path is understood to mean that a partial flow is diverted before being combined with the further partial flow and thereby covers a larger distance, so that the low-pressure vibrations of the partial flows are superimposed and the vibrations in the low-pressure region are partially canceled out.
  • the invention additionally comprises a fuel injector which is set up to carry out the method according to the invention.
  • the fuel injector in this case comprises a control chamber, into which a fuel can be introduced at high pressure, so that a force can be applied to an axial end face of a nozzle needle that delimits the control chamber, so that the nozzle needle enters one
  • Closing direction is hydraulically loaded, a drain hole formed in a throttle plate, connected to the control chamber with an outlet throttle, a control valve arranged in a valve plate with a valve chamber which is connected to the drain hole, and a valve body which with a
  • Valve seat surface cooperates so that when the control valve is open, fuel can be diverted from the valve chamber, a low-pressure chamber which is delimited by the valve plate and a coupler body and which is fluidly connected to the valve chamber, the coupler body for connection to a return line forming part of an outflow path has at least one opening, a groove which is formed between the valve plate and throttle plate, and which via at least one riser with the
  • Return line is connected, so that fuel from the riser via the Return line can be removed, and at least one outflow line, which is arranged between the low pressure chamber and the groove and / or the riser, which the low pressure chamber with the groove and / or the
  • the method according to the invention can be achieved using the fuel injector
  • Outflow line formed such that the low pressure chamber with a
  • Annulus is connected to a radial outside of the valve plate.
  • the advantages mentioned for the method are achieved by such an annular space.
  • the at least one outflow line is designed as a bore.
  • a hole has the advantage that it is simple and economical to manufacture and has only low flow losses.
  • an inlet bore is formed in the throttle plate with an inlet throttle, which is connected to the control chamber, so that a fuel can be introduced into the control chamber at high pressure.
  • a filling bore is preferably formed in the throttle plate, which has a hole formed in the nozzle body and surrounding the nozzle needle
  • High pressure room connects to the valve room.
  • a bypass is formed by the filling bore, which leads to a faster pressure build-up in the valve chamber after the control valve is closed, so that the nozzle needle is hydraulically loaded faster in the closing direction. This enables short spraying intervals.
  • the fuel injector is a piezo injector.
  • a piezo injector has the advantage that it has a fast response time.
  • FIG. 1 fuel injector according to a first exemplary embodiment of the invention
  • FIG. 3 View of a valve plate according to a second embodiment of the invention.
  • the fuel injector 10 has a holding body 14, a valve plate 18, a throttle plate 22 and a nozzle body 26, which abut one another in this order and are connected to one another in a rotationally secure manner (see also FIG. 2).
  • the components are replaced by a
  • a high-pressure chamber 46 is formed in the nozzle body 26, in which a piston-shaped nozzle needle 50 is arranged to be longitudinally displaceable. The nozzle needle 50 is guided in a middle section in the high-pressure chamber 46, the Fuel past several cuts 54 to one not shown
  • Injection area is directed.
  • a sleeve 58 At an axial end of the nozzle needle 50 opposite the injection area, the latter is surrounded by a sleeve 58, the sleeve 58 being supported by a closing spring 62 which surrounds the nozzle needle 50 and is supported on a shoulder 66 on a side of the closing spring 62 opposite the sleeve 58 , pressed against the throttle plate 22.
  • a control chamber 74 which is filled with fuel is delimited by the sleeve 58, the throttle plate 22 and an axial end face 70 of the nozzle needle 50 facing away from the injection region, so that the pressure in the control chamber 74 causes a hydraulic force on the axial end face 70 of the nozzle needle 50 is exercised and the nozzle needle 50 is hydraulically loaded in a closing direction.
  • valve plate 18 and the throttle plate 22 is a
  • Inlet channel 78 (see Figure 2) formed, via the compressed fuel under high pressure from a high-pressure fuel source, not shown in the
  • High pressure chamber 46 is passed.
  • the inlet channel 78 is connected to the control chamber 74 via an inlet bore 82 formed in the throttle plate 22
  • Control chamber 74 the same pressure as in the high pressure chamber 46.
  • a control valve 90 is arranged in the valve plate 18, which comprises a valve chamber 94, which is connected to the control chamber 74 via a drain hole 98 formed in the throttle plate 22 with a drain throttle 102 (see FIG. 1 or 2).
  • the control valve 90 comprises a valve body 106 which, in the valve chamber 94, moves between a closed position and a piston 114 via a piston 114 which is movable by an electrical actuator (not shown) and is guided in a coupler body 110
  • Open position is movable.
  • the valve body 106 cooperates sealingly with a valve seat surface 118, so that an outflow of the fuel from the valve chamber 94 is prevented.
  • the fuel flows out of the valve chamber 94, so that the pressure in the control chamber 74 is reduced and the nozzle needle 50 is displaced in the direction of the valve chamber 94, as a result of which fuel flows into a Combustion chamber is injectable.
  • the open position of the valve body 106 the fuel is discharged into a low-pressure space 122 delimited by the valve plate 18 and the coupler body 110.
  • a plurality of openings 126 are arranged in the coupler body 110, which open the low-pressure space 122 via a surface exposure 130 with one formed in the holding body 14
  • Return line 134 connects.
  • an outflow line 138 is formed, which connects the low pressure chamber 122 with one between the valve plate 18 and the
  • Throttle plate 22 arranged groove 142 connects, which is designed as a circumferential annular groove. As a result, part of the fuel can be discharged from the low-pressure chamber 122 into the annular groove 142 via the outflow line 138.
  • a riser 146 is formed in the valve plate 18, which connects the annular groove 142 to the return line 134. As a result, part of the returned fuel flows out along an extended path.
  • FIG. 2 additionally shows a filling bore 150 which extends in the throttle plate 22 between the high-pressure chamber 46 and the valve chamber 94, so that fuel can be refilled into the valve chamber 94.
  • FIG 3 is a view of a valve plate 18 after a second

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)

Abstract

L'invention concerne un procédé pour faire fonctionner un injecteur de carburant (10) et un injecteur de carburant (10) conçu pour mettre en œuvre ce procédé. Le procédé selon l'invention comprend les étapes consistant : à introduire un carburant soumis à une pression élevée dans un canal d'alimentation (78) et à dériver un flux partiel de ce carburant soumis à une pression élevée vers un espace de commande (74) dans lequel une face frontale (70) axiale de l'aiguille d'injecteur (50) est soumise à la pression, de manière que cette aiguille d'injecteur (50) soit sollicitée hydrauliquement dans la direction de fermeture ; à ouvrir une soupape de commande (90), de sorte qu'un trajet d'écoulement situé en aval de la soupape de commande (90) dans la direction d'écoulement soit libéré et que le carburant s'écoule hors de l'espace de commande (74), pour libérer la pression appliquée sur l'aiguille d'injecteur (50), le carburant s'écoulant le long du trajet d'écoulement étant divisé en au moins deux flux partiels.
EP19736361.7A 2018-07-12 2019-07-03 Injecteur de carburant et procédé pour faire fonctionner un injecteur de carburant Withdrawn EP3821117A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018211679.2A DE102018211679A1 (de) 2018-07-12 2018-07-12 Kraftstoffinjektor und Verfahren zum Betreiben eines Kraftstoffinjektors
PCT/EP2019/067793 WO2020011610A1 (fr) 2018-07-12 2019-07-03 Injecteur de carburant et procédé pour faire fonctionner un injecteur de carburant

Publications (1)

Publication Number Publication Date
EP3821117A1 true EP3821117A1 (fr) 2021-05-19

Family

ID=67180778

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19736361.7A Withdrawn EP3821117A1 (fr) 2018-07-12 2019-07-03 Injecteur de carburant et procédé pour faire fonctionner un injecteur de carburant

Country Status (4)

Country Link
US (1) US20210324824A1 (fr)
EP (1) EP3821117A1 (fr)
DE (1) DE102018211679A1 (fr)
WO (1) WO2020011610A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002202022A (ja) * 2000-10-30 2002-07-19 Denso Corp バルブ駆動装置および燃料噴射弁
DE102010028011A1 (de) 2010-04-21 2011-10-27 Robert Bosch Gmbh Optimierte Ventilplatte eines Kraftstoffinjektors
DE102011081643A1 (de) * 2011-06-30 2013-01-03 Robert Bosch Gmbh Kraftstoffinjektor

Also Published As

Publication number Publication date
US20210324824A1 (en) 2021-10-21
DE102018211679A1 (de) 2020-01-16
WO2020011610A1 (fr) 2020-01-16

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