WO2017202540A1 - Soupape de commande pour un injecteur de carburant - Google Patents

Soupape de commande pour un injecteur de carburant Download PDF

Info

Publication number
WO2017202540A1
WO2017202540A1 PCT/EP2017/058804 EP2017058804W WO2017202540A1 WO 2017202540 A1 WO2017202540 A1 WO 2017202540A1 EP 2017058804 W EP2017058804 W EP 2017058804W WO 2017202540 A1 WO2017202540 A1 WO 2017202540A1
Authority
WO
WIPO (PCT)
Prior art keywords
control valve
valve
throttle
chamber
pressure
Prior art date
Application number
PCT/EP2017/058804
Other languages
German (de)
English (en)
Inventor
Lars Olems
Oezguer Tuerker
Mario Herrera
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 WO2017202540A1 publication Critical patent/WO2017202540A1/fr

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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0639—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature acting as a valve
    • 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
    • F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion
    • 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

Definitions

  • the invention relates to a control valve for a fuel injection valve, which is used for metering the fuel ejected by the fuel injection valve.
  • a fuel injection valve with a control valve which is designed as a solenoid valve.
  • a control chamber Via the solenoid valve, a control chamber can be connected to a low pressure chamber, wherein the control chamber exerts a hydraulic closing force on the nozzle needle of the fuel injector, so that it is held in its closed position at a correspondingly high pressure in the control chamber. If the connection of the control chamber with the low-pressure chamber is released via the control valve, the pressure in the control chamber decreases and, accordingly, the hydraulic closing force on the nozzle needle drops until it lifts off from its sealing seat and is injected, driven by the hydraulic pressure of the fuel surrounding the nozzle needle releases.
  • the control valve includes a magnetic armature having a sleeve-shaped portion with a sealing seat, which cooperates with a corresponding body seat and thereby releases or closes the outlet cross-section between the control chamber and the low-pressure chamber.
  • armature performs a well-defined stroke. If this stroke is too small, then it can lead to restrictions on the sealing seat of the armature, so that the pressure in the control chamber does not decrease as intended and thus the injector opens either not or only delayed, which affects the injection quantity accordingly.
  • control valve according to the invention for a fuel injection valve in contrast, has the advantage that damage due to cavitation on the control valve can be reliably prevented and, at the same time, the manufacturing outlay and the corresponding manufacturing tolerances to be complied with are reduced.
  • the control valve has a longitudinally movable control valve element, which cooperates with a control valve seat for opening and closing a valve space with respect to the low-pressure space, wherein in the valve space an outlet throttle connected to the high-pressure region opens.
  • a throttle element In the valve chamber, between the outlet throttle and the control valve seat, a throttle element is arranged, which has at least one throttle opening.
  • valve space is formed as a bore in a valve piece which is part of the control valve.
  • tax Tilsitz can be advantageously formed on the valve piece, as well as the outlet throttle may be formed in the valve piece. Since the valve piece is made as a separate component, it can be easily and inexpensively manufactured.
  • control valve element is designed as a magnet armature, which is movable by an electromagnet.
  • valve element is at least partially sleeve-shaped and then has at a control valve seat facing the end of an annular sealing area.
  • annular sealing area is particularly advantageous when the valve space is formed as a bore, as both can then be easily implemented constructively.
  • the throttle element is designed as a throttle disk, in which one or more throttle openings are formed.
  • This throttle element can be manufactured as a separate component and placed in a simple manner within the valve chamber.
  • the throttle element is advantageously arranged so that the effluent via the control valve fluid, preferably fuel, can flow exclusively through the throttle openings of the outlet throttle to the low pressure chamber. Due to the design of the throttle openings, the flow resistance can be easily adjusted via its diameter and number.
  • FIG. 1 shows a control valve according to the invention, wherein this is shown as part of a fuel injector, which is indicated schematically,
  • FIG. 2 shows a detailed representation of the control valve in the region of the control valve seat
  • FIG. 3a, 3b, 3c is a plan view of throttle elements according to the invention, which are designed here as a throttle plate and have different throttle openings, and Figure 4 shows the time course of the stroke of the control valve element, each with and without throttle element.
  • a control valve according to the invention is shown in longitudinal section together with the essential components of a fuel injector, which is indicated only schematically.
  • the fuel injection valve 1 comprises a control valve 2, which comprises a valve housing 3.
  • the valve housing 3 is in contact with an only indicated injector body 4 and is liquid-tight clamped with this.
  • a magnetic core 5 is arranged, which is clamped by a leaf spring 8 against a shoulder in the valve housing 3 and thus held stationary.
  • a magnetic coil 6 is arranged, so that the magnetic core 5 and the magnetic coil 6 together form an electromagnet.
  • the magnetic core 5 is limited together with the valve body 4 and a valve member 15 which is disposed within the injector body 4, a low pressure chamber 18 which is filled with fuel during operation of the fuel injection valve, but it is constantly connected to a low-pressure drain and thus only under low pressure stands.
  • the valve member 15 is clamped by a clamping screw 19 which engages in a thread within the injector body 4, against a not shown paragraph in the injector body 4 and is thus held stationary.
  • a magnet armature 10 is arranged, which cooperates with the electromagnet 5, 6 and can be moved in the longitudinal direction upon actuation of the electromagnet 5, 6.
  • the armature 10 has a cylindrical portion and is guided on a valve pin 12, which is arranged in the hollow cylindrical portion of the anchor bolt 10.
  • the valve pin 12 passes through a hole formed in the magnetic core 5 bore 14 and is supported with its valve piece 15 facing away from the end of the valve housing 3 from.
  • the valve pin 12 is surrounded by an armature spring 13 which is supported with one end on the valve housing 3 and with the other end on the armature 10, wherein between the armature spring 13 and the armature 10, a support ring 16 is arranged.
  • the armature spring 13 is under pressure bias, so that the magnet armature 10 by the action of the armature spring 13 against a Control valve seat 17 is pressed, which is formed on the valve piece 15.
  • the control valve seat 17 is annular and surrounds a bore formed in the valve piece 15, which forms a valve chamber 25.
  • the magnet armature 10 is also guided with its cylindrical portion in a cylindrical extension 20 of the valve member 15, wherein in the cylindrical extension 20, one or more transverse bores 21 are provided, can flow through the fuel from the valve chamber 25 in the low pressure chamber 18.
  • valve chamber 25 opens an outlet throttle 27, which is also formed in the valve member 15 and the other end opens into a control chamber 30.
  • the control chamber 30 is thereby limited by a sleeve 31 and by the control valve 2 facing the end of a nozzle needle 35, wherein the sleeve 31 is clamped by the force of a sleeve spring 32 against the valve member 15 liquid-tight.
  • the control chamber 25 can be filled with fuel under high pressure via a high pressure line 47, is conveyed via the fuel by a high-pressure pump 46 from a fuel tank 45.
  • the nozzle needle 35 is received in a nozzle body 9, wherein between the nozzle needle 35 and the wall of the nozzle body 9, a pressure chamber 36 remains, which is also filled via the high-pressure line 47 with fuel under high pressure.
  • the nozzle needle 35 cooperates with its sealing surface 37 with a nozzle body seat 38 which is formed at the combustion chamber end of the nozzle body 9 for opening and closing one or more injection openings 40 which are formed in the nozzle body 9.
  • the operation of the fuel injector is as follows: At the beginning of the injection of the armature 10 is biased by the force of the armature spring 13 against the control valve seat 17, so that the valve chamber 25 is sealed against the low-pressure chamber 18.
  • the control chamber 30 as well as the valve chamber 25 is filled by the connection via the outlet throttle 27 with fuel under high pressure, as well as the pressure chamber 36 in the nozzle body 9. If an injection of fuel done, the electromagnet 5, 6 energized and pulls the Magnet armature 10 away from the control valve seat 17, so that an opening between the control valve seat 17 and the armature 10 is opened, via which the valve chamber 25 is connected to the low-pressure chamber 18.
  • FIG. 2 shows a plan view of the throttle element 50, so that the arrangement of the throttle openings 52 becomes clear.
  • the mode of operation of the throttle element 50 will be explained on the basis of the course of the stroke h of the control valve element, that is to say of the magnet armature 10, and of the pressure p in the valve chamber, as shown in FIG.
  • the solid line shows the course of stroke h and pressure p in a control valve with a throttle element 50 according to the invention, while the dashed line shows the course without a corresponding throttle element 50.
  • the illustration in the upper part of Figure 4 shows an increase of the stroke k of the armature 10 until it has reached its end position.
  • the end position can be adjusted, for example, via the dimensions of the magnet armature or by means of a disc which is located between the magnet core 5 and the magnetic core.
  • Anchor 10 is arranged, whose thickness determines the maximum stroke of the armature 10. According to the stroke of the armature 10, the pressure p in the valve chamber 25 decreases, as shown in the lower part of Figure 4. Since the stroke of the magnet armature is relatively large, correspondingly, the pressure in the valve chamber 25 drops sharply, with the result that cavitation bubbles can form within the valve chamber 25. This effect is desirable to some extent, but too much pressure drop causes too many cavitation bubbles to be formed and they are durable and thus risk imploding near the confining walls of the valve space 25 cause material damage.
  • the minimum pressure can be adjusted, which forms in the valve chamber 25, wherein in Figure 4, the pressure in the valve chamber 25 is shown, as he - seen in the direction of flow of the fuel in the direction of the low pressure chamber 18 - before the throttle element 50 prevails.
  • the throttle element 50 is held stationary within the valve chamber 25 and sealingly abuts the wall of the valve chamber 25 at the outer edge, so that the fuel flow in the direction of the low-pressure chamber 18 occurs exclusively via the throttle openings 52.
  • the throttle element 50 is designed as a disk, it can be placed, for example, by a press fit within the valve space 25, which is designed as a bore in the valve piece 15. In general, however, the throttle element 50 is held in position solely by the pressure conditions, ie by the higher pressure in the region of the valve chamber 25 below the throttle element 50 with respect to the region of the valve chamber 25 which is located on the other side of the throttle element 50.
  • the throttle openings 52 are not formed as bores, but as lateral recesses on the throttle element 50, as shown in Fig. 3b. Accordingly, the fuel flows exclusively through these throttle openings 52 ', when the throttle element 50 is sealingly fitted with the remaining edge in the valve chamber 25. It may also be provided that instead of holes differently shaped recesses the throttle openings 52 'form, for example, slot-shaped openings, as shown in Fig. 3c.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Soupape de commande (2) pour un injecteur de carburant, servant à relier une zone haute pression (30 ; 36) à une chambre basse pression (18), comprenant un élément soupape de commande (10) mobile longitudinalement et coopérant avec un siège de soupape de commande (17) pour ouvrir et fermer une chambre de soupape (25) par rapport à la chambre basse pression (18), un étranglement de sortie (27) raccordé à la zone haute pression (30 ; 36) débouchant dans la chambre de soupape (25). Un élément d'étranglement (50) présentant au moins une ouverture d'étranglement (52) est disposé dans la chambre de soupape (25) entre l'étranglement de sortie (27) et le siège de soupape de commande (17).
PCT/EP2017/058804 2016-05-24 2017-04-12 Soupape de commande pour un injecteur de carburant WO2017202540A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016209022.4 2016-05-24
DE102016209022.4A DE102016209022A1 (de) 2016-05-24 2016-05-24 Steuerventil für ein Kraftstoffeinspritzventil

Publications (1)

Publication Number Publication Date
WO2017202540A1 true WO2017202540A1 (fr) 2017-11-30

Family

ID=58537013

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/058804 WO2017202540A1 (fr) 2016-05-24 2017-04-12 Soupape de commande pour un injecteur de carburant

Country Status (2)

Country Link
DE (1) DE102016209022A1 (fr)
WO (1) WO2017202540A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019206657A1 (fr) * 2018-04-26 2019-10-31 Robert Bosch Gmbh Injecteur de carburant

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19859997A1 (de) * 1998-12-23 2000-06-29 Siemens Ag Drossel für Dieseleinspritzvorrichtungen
DE10015740A1 (de) * 2000-03-29 2001-10-04 Siemens Ag Einspritzventil für die Einspritzung von Kraftstoff in eine Verbrennungskraftmaschine
EP2138708A1 (fr) * 2008-06-27 2009-12-30 C.R.F. Società Consortile per Azioni Injecteur de carburant doté d'une servocommande de mesure pour moteur à combustion interne
DE102010001486A1 (de) 2010-02-02 2011-08-04 Robert Bosch GmbH, 70469 Steuerventilanordnung eines Kraftstoffinjektors
CN102364080A (zh) * 2011-11-22 2012-02-29 哈尔滨工程大学 多级节流稳压电控喷油器
US20130112767A1 (en) * 2011-11-07 2013-05-09 Caterpillar Inc. Fuel Injector With Needle Control System That Includes F, A, Z and E Orifices
US20140252109A1 (en) * 2013-03-11 2014-09-11 Stanadyne Corporation Anti-cavitation throttle for injector control valve

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19859997A1 (de) * 1998-12-23 2000-06-29 Siemens Ag Drossel für Dieseleinspritzvorrichtungen
DE10015740A1 (de) * 2000-03-29 2001-10-04 Siemens Ag Einspritzventil für die Einspritzung von Kraftstoff in eine Verbrennungskraftmaschine
EP2138708A1 (fr) * 2008-06-27 2009-12-30 C.R.F. Società Consortile per Azioni Injecteur de carburant doté d'une servocommande de mesure pour moteur à combustion interne
DE102010001486A1 (de) 2010-02-02 2011-08-04 Robert Bosch GmbH, 70469 Steuerventilanordnung eines Kraftstoffinjektors
US20130112767A1 (en) * 2011-11-07 2013-05-09 Caterpillar Inc. Fuel Injector With Needle Control System That Includes F, A, Z and E Orifices
CN102364080A (zh) * 2011-11-22 2012-02-29 哈尔滨工程大学 多级节流稳压电控喷油器
US20140252109A1 (en) * 2013-03-11 2014-09-11 Stanadyne Corporation Anti-cavitation throttle for injector control valve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019206657A1 (fr) * 2018-04-26 2019-10-31 Robert Bosch Gmbh Injecteur de carburant
CN112352096A (zh) * 2018-04-26 2021-02-09 罗伯特·博世有限公司 燃料喷射器

Also Published As

Publication number Publication date
DE102016209022A1 (de) 2017-11-30

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