[go: up one dir, main page]

WO2008061842A1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

Info

Publication number
WO2008061842A1
WO2008061842A1 PCT/EP2007/060741 EP2007060741W WO2008061842A1 WO 2008061842 A1 WO2008061842 A1 WO 2008061842A1 EP 2007060741 W EP2007060741 W EP 2007060741W WO 2008061842 A1 WO2008061842 A1 WO 2008061842A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
control piston
control
fuel injector
bore
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.)
Ceased
Application number
PCT/EP2007/060741
Other languages
German (de)
English (en)
Inventor
Friedrich Boecking
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 WO2008061842A1 publication Critical patent/WO2008061842A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0043—Two-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
    • F02M63/007—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
    • 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
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • the invention relates to a fuel injector according to the preamble of patent claim 1.
  • the fuel injector according to the invention with its force-balanced control sleeve has, depending on the design, one or more of the following advantages: With a force balanced control valve, the dynamics can be improved.
  • Very compact solution with a force balanced solenoid valve The concept is suitable for inline use. - By using a compact balanced valve, where the leakage passes through the spool and not over the armature, a nearly vibration free high dynamic valve can be built.
  • a valve seat designed as a flat seat enables a compact valve design that allows very small valve strokes via the flat seat with extremely steep flow behavior, which can considerably increase the dynamics of the valve.
  • Control valve that opens to the outside in the direction of movement of the piezoelectric actuator.
  • An outward-opening, force-balanced control valve with integrated hydraulic translator that simultaneously reverses the direction of movement, provides a compact solution that allows a very small, narrow piezoelectric actuator.
  • FIGS. 1 to 6 six different embodiments of the invention
  • the fuel injector 1 shown in Fig. 1 is usually at a
  • the injector has in a known manner a projecting into a cylinder combustion chamber of the internal combustion engine, not shown here injector and the injector depending on the pressure in a control chamber 2 opening and closing, here indicated only to a small extent nozzle needle 3.
  • the control chamber 2 is connected via an inlet throttle (Z-throttle) 4 permanently to a high-pressure inlet line (high pressure side) 5 of the fuel.
  • Z-throttle inlet throttle
  • a control valve 6 in the form of a 2/2-way valve is provided, which is the connection of the control chamber 2 with a low-pressure chamber
  • the high-pressure feed line 5 is connected to a high-pressure accumulator, not shown (common rail), and the low-pressure chamber 7 is connected to a drain 7a.
  • the nozzle needle 3 is guided to form the control chamber 2 in a valve piece 8, in which the Z-throttle 4 is provided.
  • the control valve 6 has a guide piece 9 with a through-bore 9a and a control piston 10 displaceably guided therein between two valve positions, the upper end of the piston protruding into the low-pressure space 7 in FIG.
  • the valve and guide pieces 8, 9 are arranged in a bore of an injector body 11, wherein the valve member 8 is clamped in the Injektorbohrung by the guide piece 9 screwed therein.
  • the through-hole 9a is closed at the bottom by the valve piece 8.
  • the valve and guide pieces 8, 9 extending from the control chamber 2 connecting channel 13 which opens into the bore 9a of the guide piece 9, more precisely in an annular groove 14 of the control piston 10, and an outlet throttle (A-throttle) 15 has.
  • a conical valve seat 16 connects at the bottom of the annular groove 14.
  • the control piston 10 has at its thickened lower end a conical sealing surface which cooperates with the conical valve seat 16.
  • the valve seat 16 is connected to the low-pressure chamber 7 above the control piston 10.
  • the control piston 10 is biased by a closing spring 18 supported on the housing side into its closed valve position shown in FIG. 1 and displaceable into its open valve position by means of a magnetic coil 19 whose magnetic field acts on a disk-shaped armature 20 of the control piston 10.
  • the armature 20 is provided at the upper end of the control piston 10.
  • the magnetic coil 19 is located below the armature 20.
  • the magnetic coil 19 with its magnetic core 21 is arranged inside a magnet sleeve 22 which is fastened to the injector body 11 by means of a magnetic clamping nut 23 ,
  • the diameter d of the valve seat 16 is equal to the guide diameter D of the guide piece 9, whereby the control piston 10 is force-balanced in its closed valve position shown in Fig. 1 with respect to the pressure prevailing in the annular groove 14 high pressure. In this closed valve position, the connection of the control chamber 2 to the low pressure side 7 is blocked by the control piston 10 and therefore the nozzle needle 3 is closed by the pressure prevailing in the control chamber 2 high pressure. If the solenoid coil 19 is energized, the control piston 10 is pulled from the valve seat 16 in the direction of the nozzle needle 3, that is down, into its open valve position, whereby the pressure in the control chamber 2 is reduced and the nozzle needle 3 opens.
  • the pressure surge occurring during opening of the control piston 10 is not dissipated via the armature 20, but via the longitudinal bore 17, whereby the control piston 10 is not excited to vibrate.
  • the path of the reduced fuel quantity from the valve seat 16 to the drain 7a is marked with flow arrow 24. Since the control piston 10 is force-balanced, only small forces are required to open the control piston 10.
  • the control piston 10 makes only a very small opening stroke of about 20-30 microns.
  • the A-throttle 15 limits the flow. If the energization of the solenoid 19 is released, the control piston 10 is moved back into its closed valve position via the closing spring 18 and the control chamber 2 is filled again via the Z-throttle 4.
  • the fuel injector 1 shown in Fig. 2 differs in that here the armature 20 is disposed at the lower end of the control piston 10 and the valve seat 16 is formed as a flat seat.
  • the low pressure side is followed by a longitudinal bore 26 in the guide piece 9, which opens into the low-pressure chamber 7. The occurring during opening of the control piston 10 pressure surge (Abêtenfin) is not over the
  • This injector 1 is a very compact solution with a force-balanced control valve 6, wherein the combination of a flat seat 16 with a force-balanced control piston 10 allows a very high dynamics.
  • the fuel injector 1 shown in Fig. 3 differs in that here the annular groove 14 is formed in the guide piece 9 and the valve seat 16 connects upwards, ie in the closing direction of the control piston 10, to the annular groove 14.
  • the seat opening of the valve seat 16 is connected to the low pressure chamber 7 via an annular gap 31 located between the control piston 10 and the magnetic core 21.
  • the closing spring 18 is arranged between the valve piece 8 and control piston 10 in a spring chamber 32, which is connected via longitudinal and transverse bores 17, 33 with the low pressure chamber 7 and with the annular gap 31.
  • the fuel injector 1 shown in Fig. 4 differs in that here the control piston 10 via a hydraulic booster 40, which in turn is controlled by a schematically indicated here only as an arrow piezoelectric actuator 41, is opened.
  • the hydraulic booster 40 includes two pistons 43, 44 which are coupled in a synchronized motion with each other through an intermediate fuel-filled booster chamber 42.
  • the piezoactuator 41 acts on the upper piston 43, and the lower piston 44 is formed integrally with the control piston 10. In the closed valve position shown, the piezoelectric actuator 41 is not energized and thus shortened, whereby the upper piston 43 is displaced upwards and thus the lower piston 44 and the control piston 10 are displaced upwards into the closed valve position.
  • the piezoelectric actuator 41 If the piezoelectric actuator 41 is energized, it is extended against the action of a tubular spring 45, whereby the upper piston 43 is pushed down and thus the lower piston 44 and the control piston 10 are also moved down into the open valve position. If the piezoelectric actuator 41 is no longer energized, the control piston 10 is moved back to its closed valve position via the closing spring 18 supported on the upper piston 43 and the control chamber 2 is filled again via the Z-throttle 4. Since hardly force is demanded from the piezoelectric actuator 41, it can be made very small in diameter. Through the longitudinal bore 17 and transverse bores 46 in
  • Control piston 10 and through holes 47 of a common cylinder sleeve 48 flows with open control piston 10 the amount of fuel diverted from the control chamber 2 in the low-pressure chamber 7.
  • the compact control valve 6 is an outwardly opening (A-valve), which opens in the direction of force of the piezoelectric actuator 41 and hydraulically translated controls the force balanced control piston 10, whereby the piezoelectric actuator 31 can be made very narrow.
  • the fuel injector 1 shown in Fig. 5 differs in that here the control piston 10 is opened directly by a piezoelectric actuator 41 and the valve seat 16 is formed as a flat seat.
  • the piezoelectric actuator 41 is suspended in a housing 51 made of invar, which is fixed in the bore of the injector body 11.
  • the piezoelectric actuator 41 is separated by a membrane 52 from the low-pressure chamber 7 and thus protected from fuel.
  • the piezoelectric actuator 41 is not energized and thus shortened, whereby the control piston 10th are moved upwards in the closed valve position.
  • the fuel injector 1 shown in Fig. 6 differs in that here the control piston 10 is not opened directly from the piezoelectric actuator 41, but via the hydraulic booster 40 shown in Fig. 4.

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 injecteur de carburant (1) pour des moteurs à combustion interne, avec une chambre de commande (2) qui est raccordée à un côté haute pression (5) et dont la pression commande le mouvement d'un pointeau (3), et avec une soupape de commande (6) qui ferme ou ouvre la liaison de la chambre de commande (2) vers un côté basse pression (7). Selon l'invention, la soupape de commande (6) présente un piston de commande (10) à force équilibrée, guidé en déplacement entre deux positions de soupape dans un alésage (9a) d'un élément de guidage (9). Ce piston ferme dans sa position de soupape fermée la liaison vers le côté basse pression (7) d'un canal de liaison (13) provenant de la chambre de commande (2) et débouchant dans l'alésage (9a), et ouvre cette liaison dans sa position de soupape fermée, déplacée en direction du pointeau (3).
PCT/EP2007/060741 2006-11-24 2007-10-10 Injecteur de carburant Ceased WO2008061842A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006055487.6 2006-11-24
DE200610055487 DE102006055487A1 (de) 2006-11-24 2006-11-24 Kraftstoffinjektor

Publications (1)

Publication Number Publication Date
WO2008061842A1 true WO2008061842A1 (fr) 2008-05-29

Family

ID=38792078

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/060741 Ceased WO2008061842A1 (fr) 2006-11-24 2007-10-10 Injecteur de carburant

Country Status (2)

Country Link
DE (1) DE102006055487A1 (fr)
WO (1) WO2008061842A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120216772A1 (en) * 2009-11-10 2012-08-30 Robert Bosch Gmbh Fuel injector

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007047129A1 (de) * 2007-10-02 2009-04-09 Robert Bosch Gmbh Injektor mit hülsenförmigem Steuerventilelement
DE102009055267A1 (de) 2009-12-23 2011-06-30 Robert Bosch GmbH, 70469 Druckausgeglichener Kraftstoffinjektor mit Bypass und minimiertem Ventilraumvolumen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19930530A1 (de) * 1999-07-01 2001-01-11 Siemens Ag Vorrichtung und Verfahren zum Regeln der Einspritzung von Kraftstoff durch einen Kraftstoffinjektor in einer Brennkraftmaschine
DE19939452A1 (de) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Vorrichtung zur Einspritzung von Kraftstoff
DE10315015A1 (de) * 2003-04-02 2004-10-28 Robert Bosch Gmbh Kraftstoffinjektor mit Druckverstärker und Servoventil mit optimierter Steuermenge
EP1612398A1 (fr) * 2004-06-30 2006-01-04 C.R.F. Società Consortile per Azioni Injecteur de carburant a soupape de commande a equilibrage des forces
EP1865192A2 (fr) * 2006-06-07 2007-12-12 Robert Bosch Gmbh Injecteur de carburant doté d'une assistance adaptative à la direction

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19930530A1 (de) * 1999-07-01 2001-01-11 Siemens Ag Vorrichtung und Verfahren zum Regeln der Einspritzung von Kraftstoff durch einen Kraftstoffinjektor in einer Brennkraftmaschine
DE19939452A1 (de) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Vorrichtung zur Einspritzung von Kraftstoff
DE10315015A1 (de) * 2003-04-02 2004-10-28 Robert Bosch Gmbh Kraftstoffinjektor mit Druckverstärker und Servoventil mit optimierter Steuermenge
EP1612398A1 (fr) * 2004-06-30 2006-01-04 C.R.F. Società Consortile per Azioni Injecteur de carburant a soupape de commande a equilibrage des forces
EP1865192A2 (fr) * 2006-06-07 2007-12-12 Robert Bosch Gmbh Injecteur de carburant doté d'une assistance adaptative à la direction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120216772A1 (en) * 2009-11-10 2012-08-30 Robert Bosch Gmbh Fuel injector

Also Published As

Publication number Publication date
DE102006055487A1 (de) 2008-05-29

Similar Documents

Publication Publication Date Title
EP0657642A2 (fr) Dispositif d'injection de combustible pour moteurs à combustion interne
WO2005075811A1 (fr) Injecteur de carburant avec obturateur d'injection a commande directe
DE102008005532A1 (de) Kraftstoffinjektor, dessen Steuerventilelement einen Stützbereich aufweist
EP2215349A1 (fr) Buse d'injection de carburant comprenant une soupape à bille
EP1944500A2 (fr) Injecteur de carburant
WO2008061844A1 (fr) Injecteur de carburant
DE102008001597A1 (de) Kraftstoff-Injektor
WO2008049699A1 (fr) Injecteur de carburant
WO2008049671A1 (fr) Injecteur de carburant
DE102008040680A1 (de) Kraftstoff-Injektor
EP1939441A2 (fr) Injecteur de carburant
WO2008061842A1 (fr) Injecteur de carburant
EP2011995A2 (fr) Injecteur doté d'un élément d'aération s'ouvrant vers l'extérieur
DE102012220027A1 (de) Schaltventil für einen Kraftstoffinjektor
WO2009141175A1 (fr) Soupape d'injection de carburant
EP1983186A2 (fr) Elément de commande à compensation de pression
DE102007005382A1 (de) Leckagefreier Injektor
DE102009046373A1 (de) Magnetventil sowie Kraftstoff-Injektor mit einem Magnetventil
DE102007009167A1 (de) Mehrwegeventil
DE102007013249A1 (de) Kraftstoffinjektor mit verbessertem Einspritzverhalten
DE102006015745A1 (de) Kraftstoffinjektor mit direktgesteuertem Einspritzventilglied
DE102012206213A1 (de) Kraftstoffinjektor mit Magnetventil
DE102008002526A1 (de) Kraftstoff-Injektor
WO2009138279A1 (fr) Vanne magnétique à fentes d'induit
WO2008086941A1 (fr) Injecteur de carburant à coupleur

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07821109

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 07821109

Country of ref document: EP

Kind code of ref document: A1