EP2147206B1 - Injecteur de carburant avec électrovanne - Google Patents

Injecteur de carburant avec électrovanne Download PDF

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Publication number
EP2147206B1
EP2147206B1 EP08735915.4A EP08735915A EP2147206B1 EP 2147206 B1 EP2147206 B1 EP 2147206B1 EP 08735915 A EP08735915 A EP 08735915A EP 2147206 B1 EP2147206 B1 EP 2147206B1
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EP
European Patent Office
Prior art keywords
pressure
fuel injector
valve
control chamber
valve element
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
EP08735915.4A
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German (de)
English (en)
Other versions
EP2147206A1 (fr
Inventor
Nadja Eisenmenger
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2147206A1 publication Critical patent/EP2147206A1/fr
Application granted granted Critical
Publication of EP2147206B1 publication Critical patent/EP2147206B1/fr
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
    • 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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • 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
    • 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
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • 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
    • F02M63/0073—Pressure balanced 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
    • F02M63/007—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
    • F02M63/008—Hollow valve members, e.g. members internally guided
    • 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
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator

Definitions

  • An injector for injecting fuel into a combustion chamber of an internal combustion engine in which an injection valve member is driven by a solenoid-operated control valve, is off EP-A 1 612 403 known.
  • an outlet throttle from a control chamber in the fuel return can be closed or released.
  • the control chamber is bounded on one side by a control piston with which an injection valve member is actuated which releases or closes at least one injection opening in the combustion chamber of the internal combustion engine.
  • the outlet throttle is received in a body, which is provided on the side facing away from the control chamber with a tapered valve seat.
  • a closing element is adjustable, which is connected to the armature of the solenoid valve.
  • an edge is formed on the closing element, which is provided against the conically shaped seat.
  • the closing element moves on an axial rod, which is integrally connected to the body, with which the outlet throttle is formed.
  • stroke-controlled injectors can be used, which are operated by means of a solenoid valve for controlling the pressure in a control chamber.
  • the preferably needle-shaped injection valve member is controlled, for example via a servo control room.
  • the pressure in the control chamber is controlled by the solenoid valve, which has a spherical closing element.
  • the solenoid valve is usually not pressure balanced and therefore requires high spring forces, high magnetic switching forces and due to the size of spring and magnet large space.
  • a disadvantage of solenoid valves, which have a ball as a closing element is the fact that strong There are restrictions with regard to the sequences of multiple injections, so that very short successive injection intervals can not be realized or only with considerable effort.
  • Pressure compensated valves typically require much smaller spring forces, hence smaller magnetic forces to effect opening, as well as smaller valve strokes, thus allowing faster shift times.
  • solenoid valves By means of this type of solenoid valves, multiple injection capability of fuel injectors can be improved.
  • these pressure-balanced designed valves require a high pressure-tight guide and a linear sealing edge, which correspond to the guide diameter of the valve member, which allows the pressure balance of the solenoid valve.
  • Injectors of this kind are from the later published document DE 10 2006 021 741 A as well as from the document DE 199 41 463 A known.
  • a fuel injector which has an integrated storage volume, since this considerably reduces the injection tolerances that occur in the case of multiple injections. This is very important for future expected injection strategies of fuel to reduce pollutant emissions. These injection strategies reduce the pressure oscillations in the fuel injector and at the same time the so far observed pressure drop at the beginning of each injection, thus also at the beginning of each injection in the context of multiple injections. It can achieve a significantly faster opening movement of the needle-shaped injection valve member.
  • the solution proposed by the invention advantageously provides a fuel injector with a leakage-free formed injection valve member and integrated storage volume, which fully meets the requirement for characteristic curve steepness, minimum quantity capability and tolerance sensitivity.
  • an influx injector which has a storage volume integrated in the injector body and a solenoid valve arranged in the head area for actuation.
  • the needle-shaped injection valve member extends through the integrated storage volume, ie an integrated storage space therethrough, and is formed in several parts. In the case of a multi-part design, the individual components are coupled to one another mechanically or hydraulically.
  • the single FIGURE shows the cross section through the inventively proposed fuel injector with radially symmetrical and concentrically constructed control chamber, drainage channel with outlet throttle, valve seat and inflow.
  • FIG. 1 shows the inventively proposed fuel injector in longitudinal section.
  • a fuel injector 10 is acted upon via a pressure accumulator 12 with fuel under system pressure p sys .
  • the loading of the pressure accumulator 12 can be carried out by a high-pressure delivery unit, such as a high-pressure pump of a high-pressure injection system, which is not shown in the drawing.
  • the high-pressure line 14 extending from the pressure accumulator 12 to the fuel injector 10 opens into an injector body 16, in which a storage volume 18 is located.
  • the fuel injector 10 comprises, in addition to the injector body 16, a nozzle body 20 and an actuator housing 22.
  • the actuator housing 22 accommodates a rapidly switching switching valve 24, which in the embodiment of the fuel injector 10 is designed as a solenoid valve.
  • the switching valve 24 designed as a solenoid valve comprises a magnetic core 26, in which a magnetic coil 28 is embedded. Furthermore, in the magnetic core 26 there is a through bore, in which a valve spring is accommodated, as well as a pressure compensation pin 50.
  • the storage volume 18 formed in the injector body 16 serves to dampen hydraulic oscillation between the pressure accumulator 12 and the fuel injector 10.
  • the fuel injector 10 further includes a valve member 30 having a first portion 34 of an in FIG. 1 multi-part injection valve member 32 surrounds.
  • needle-shaped injection valve member 32 includes in addition to the first part 34, which serves as a push rod, a second, formed in a reduced diameter needle-shaped part 36.
  • the second, needle-shaped part 36 of the injection valve member 32 is formed in several parts here in a cage 38, which is received on the lower end face of the first pressure rod-shaped part 34 of the multipart injection valve member 32.
  • the coupling of the The first part 34 and the second part 36 of the multi-part injection valve member 32 may be mechanical or hydraulic.
  • the upper end face of the first part 34 defines a control chamber 40, which is formed in the valve piece 30.
  • the control chamber 40 of the valve member 30 is hydraulically connected via an inlet throttle 44 to the storage volume 18 in the injector body 16 of the fuel injector 10 and is thereby always subjected to system pressure p sys .
  • the drainage channel 56 which hydraulically connects an inflow space 58 and the control chamber 40 formed in the valve piece 30, is released or closed by a sleeve-shaped valve member 48.
  • the sleeve-shaped valve member 48 is placed in a valve seat 46 above the mouth of the drain passage 56 in the valve piece 30.
  • the drainage channel 56 is shown in the illustration FIG.
  • the sleeve-shaped valve member 48 of the pressure-balanced switching valve 24 is guided on the one hand on the pressure compensation pin 50 which extends through the magnetic core 26 of the fast-switching designed as a solenoid valve switching valve 24 and is supported on the ceiling of the actuator housing 22 and on the other hand in an outer guide 52, which is formed in the upper part of the valve piece 30, guided.
  • an outer guide 52 In the outer guide 52 in the valve piece 30, a bore 54 is carried out, via which diverted quantity can be fed to a low-pressure side running return 74.
  • the second, needle-shaped part 36 of the injection valve member 32 mechanically or hydraulically coupled to the first, push-rod-shaped part 34 of the multi-part injection valve member 32 is enclosed by the cage 38 and has at its peripheral surface at least one bevel 66, under which system pressure p sys standing fuel from the storage volume 18 the seat 68 of the injection valve member 32, in particular the second part 36, flows. From the illustration according to the figure shows that the second, preferably needle-shaped part 36 of the multi-part injection valve member 32 is placed in its seat 68 and therefore closes in the combustion chamber of the internal combustion engine opening injection ports 70.
  • an anchor plate 72 is formed on the sleeve-shaped valve member 48 below the magnetic core 26, in which the magnetic coil 28 is embedded, which is acted upon by the valve spring, which forms the sleeve-shaped valve member 48 in the valve seat 46.
  • the valve seat 46 When controlling the fast-switching switching valve 24, which is preferably designed as a solenoid valve, the valve seat 46 is opened because the armature plate 72 of the sleeve-shaped valve member 48 is attracted by the energized in this case solenoid 28 and the valve seat 46 opens. Due to this, the pressure in the control chamber 40 is lowered, so that an opening force acting on the multi-part injection valve member 32 in the opening direction is generated. As a result, the injection valve member 32 is wound up. To end the injection, the rapidly switching switching valve 24 is closed, whereby the pressure in the control chamber 40 to system pressure p sys increases. This closes the injection valve member 42, that is, the injection openings 70 formed at the combustion chamber end of the fuel injector 10 are closed again.
  • a slight throttling is advantageous in the inlet of the injection valve member 32 below the discharge point of the inlet throttle 44 in the valve member 30.
  • This slight throttling can be realized, for example, in a simple and cost-effective manner via an orifice 60 in the region of the guide of the first pressure-rod-shaped part 34 of the multi-part injection valve member 32.
  • the inventively proposed solution represents a fuel injector 10 with integrated storage volume 18, whereby the injection tolerances in multiple injections can be significantly reduced. This is advantageous for future injection strategies for further reducing the pollutant emissions of self-igniting internal combustion engines. Due to the storage volume 18, pressure oscillations in the fuel injector 10 can ideally be eliminated and at least significantly reduced. The storage volume 18 can also prevent a pressure drop at the beginning of each injection, so that a faster opening movement of the preferably needle-shaped one-piece or multi-part injection valve member 32 can be achieved.
  • the illustrated fast switching valve 24 allows large throttle flow rates for servo control with fast switching times.
  • the fast-switching switching valve 24 used in the fuel injector 10 proposed according to the invention represents a relatively large opening cross-section with very small opening strokes.
  • the fast-switching switching valve 24 is designed as a solenoid valve and in the upper region of the fuel injector 10, d. H. at the end remote from the combustion chamber, housed.

Claims (3)

  1. Injecteur de carburant (10) pour l'injection de carburant dans la chambre de combustion d'un moteur à combustion interne, un organe de soupape d'injection (32, 34, 36) étant actionné par le biais d'une détente de pression d'un espace de commande (40) qui est sollicité par une pression de système psys et la détente de pression de l'espace de commande (40) s'effectuant par le biais d'une soupape de commutation (24) compensée en pression, dont l'organe de soupape (48) en forme de douille ouvre ou ferme un siège de soupape (46), l'espace de commande (40), un canal d'écoulement (56) partant de l'espace de commande (40) ainsi qu'une arrivée d'afflux du siège de soupape (46) étant réalisés avec une symétrie radiale (78), et l'organe de soupape d'injection (32, 34, 36) présentant une première partie (34) en forme de tige de pression ainsi qu'une deuxième partie (36) réalisée sous forme d'aiguille, lesquelles sont accouplées l'une à l'autre mécaniquement ou hydrauliquement, le côté frontal supérieur de la partie (34) en forme de tige de pression limitant l'espace de commande (40), et un volume d'accumulateur (18) étant réalisé avec une symétrie axiale dans le corps d'injecteur (16) de l'injecteur de carburant (10) et la soupape de commutation (24) à commutation rapide étant disposée au-dessus du volume d'accumulateur (18), le siège de soupape (46) de la soupape (24) à commutation rapide étant réalisé de manière concentrique (76) au volume d'accumulateur (18) dans le corps d'injecteur (16) et l'organe de soupape d'injection (32, 34, 36) réalisé sous forme d'aiguille étant réalisé sans fuite et s'étendant à travers le volume d'accumulateur (18) intégré, caractérisé en ce que l'organe de soupape (48) en forme de douille est guidé sur une goupille de compensation en pression (50) reçue librement, et le volume d'accumulateur (18) réalisé avec une symétrie axiale dans le corps d'injecteur (16) empêche les oscillations de pression dans l'injecteur de carburant (10) et les effondrements de pression au début des injections.
  2. Injecteur de carburant (10) selon la revendication 1, caractérisé en ce que dans le canal d'écoulement (56), par le biais duquel l'espace de commande (40) est connecté hydrauliquement à un espace d'afflux (58) limité par l'organe de soupape (48) en forme de douille, est réalisé un étranglement d'écoulement (42).
  3. Injecteur de carburant (10) selon la revendication 1, caractérisé en ce que l'organe de soupape (48) réalisé sous forme de douille est guidé sur un guide (52) situé à l'extérieur.
EP08735915.4A 2007-04-19 2008-04-08 Injecteur de carburant avec électrovanne Active EP2147206B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710018472 DE102007018472A1 (de) 2007-04-19 2007-04-19 Kraftstoffinjektor mit Magnetventil
PCT/EP2008/054184 WO2008128884A1 (fr) 2007-04-19 2008-04-08 Injecteur de carburant avec électrovanne

Publications (2)

Publication Number Publication Date
EP2147206A1 EP2147206A1 (fr) 2010-01-27
EP2147206B1 true EP2147206B1 (fr) 2013-06-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08735915.4A Active EP2147206B1 (fr) 2007-04-19 2008-04-08 Injecteur de carburant avec électrovanne

Country Status (3)

Country Link
EP (1) EP2147206B1 (fr)
DE (1) DE102007018472A1 (fr)
WO (1) WO2008128884A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007047425A1 (de) * 2007-10-04 2009-04-09 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor
DE102008000929A1 (de) * 2008-04-02 2009-10-08 Robert Bosch Gmbh Hydraulische Dämpfung
US11506162B2 (en) * 2020-11-17 2022-11-22 Caterpillar Inc. Trapped volume split check assembly in fuel injector

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19941463A1 (de) * 1999-09-01 2001-03-15 Bosch Gmbh Robert Magnet-Injektor für Kraftstoff-Speichereinspritzsysteme

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6293254B1 (en) * 2000-01-07 2001-09-25 Cummins Engine Company, Inc. Fuel injector with floating sleeve control chamber
JP4345696B2 (ja) * 2004-06-21 2009-10-14 株式会社デンソー コモンレール用インジェクタ
DE602004004254T2 (de) 2004-06-30 2007-07-12 C.R.F. S.C.P.A. Servoventil zum Steuern eines Einspritzventils einer Brennkraftmaschine
EP1621764B1 (fr) * 2004-06-30 2007-11-07 C.R.F. Società Consortile per Azioni Injecteur d'un moteur à combustion interne
DE102006021736A1 (de) * 2006-05-10 2007-11-15 Robert Bosch Gmbh Kraftstoffinjektor mit druckausgeglichenem Steuerventil
DE102006021741A1 (de) * 2006-05-10 2007-11-15 Robert Bosch Gmbh Kraftstoffinjektor mit druckausgeglichenem Steuerventil
DE102006046898A1 (de) * 2006-10-04 2008-04-10 Robert Bosch Gmbh Drosselplatte für Magnetventil
DE102006050032A1 (de) * 2006-10-24 2008-04-30 Robert Bosch Gmbh Injektor mit einem eine konische Hubanschlagfläche aufweisenden Steuerventil
DE102006053128A1 (de) * 2006-11-10 2008-05-15 Robert Bosch Gmbh Injektor zum Einpritzen von Kraftstoff
DE102006055548A1 (de) * 2006-11-24 2008-05-29 Robert Bosch Gmbh Kraftstoffinjektor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19941463A1 (de) * 1999-09-01 2001-03-15 Bosch Gmbh Robert Magnet-Injektor für Kraftstoff-Speichereinspritzsysteme

Also Published As

Publication number Publication date
WO2008128884A1 (fr) 2008-10-30
EP2147206A1 (fr) 2010-01-27
DE102007018472A1 (de) 2008-10-23

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