WO2011117029A1 - Injecteur pour rampe commune comportant une soupape de commande à compensation de pression et un volume d'accumulation supplémentaire - Google Patents

Injecteur pour rampe commune comportant une soupape de commande à compensation de pression et un volume d'accumulation supplémentaire Download PDF

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Publication number
WO2011117029A1
WO2011117029A1 PCT/EP2011/052321 EP2011052321W WO2011117029A1 WO 2011117029 A1 WO2011117029 A1 WO 2011117029A1 EP 2011052321 W EP2011052321 W EP 2011052321W WO 2011117029 A1 WO2011117029 A1 WO 2011117029A1
Authority
WO
WIPO (PCT)
Prior art keywords
injector
valve
pressure
control chamber
needle body
Prior art date
Application number
PCT/EP2011/052321
Other languages
German (de)
English (en)
Inventor
Stephan Amelang
Helene Kasjanow
Klemens Steinberg
Roman Etlender
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
Priority to EP11703700A priority Critical patent/EP2550446A1/fr
Priority to CN201180015351.4A priority patent/CN102822496B/zh
Publication of WO2011117029A1 publication Critical patent/WO2011117029A1/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
    • 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
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • 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
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
    • 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

  • the invention relates to an injector, in particular fuel injector for an internal combustion engine, comprising an actuator module dominantly a valve for adjusting a flow of a fluid medium, wherein the valve a
  • Control chamber for controlling a control piston with a low pressure area connects.
  • Such an injector is known from DE 10 2007 044 356 A1.
  • This injector for injecting fuel into a combustion chamber of an internal combustion engine has an adjustable between a closed position and the fuel flow releasing open position needle body which is actuated by means of a sleeve-shaped valve member having valve, and wherein the valve element cooperates with a arranged on a valve member valve seat.
  • This injector has a pressure pin enclosed by the valve element and separate from the component, and the valve seat is designed as an outer cone. Finally, a space is arranged in a valve body of the injector, which is connected via a channel to the low-pressure region of the injector.
  • the object of the invention is to provide an injector which is improved in terms of the functional requirements for multiple injection capability.
  • This object is achieved in that the control room is connected to a storage volume.
  • This embodiment is based on the following finding.
  • the closing force is greater than the opening force generated by the fuel inventively embodied injectors.
  • the closing force is varied by pressure variation in the control chamber, with high pressure prevailing in the control room when at rest.
  • the control chamber is connected via an inlet channel with activated inlet throttle with the high-pressure region of the fuel system, while the control chamber is connected via a flow channel with activated outlet throttle controlled via the valve with the low pressure region of the fuel system.
  • Control piston which is designed in particular as a needle body moves from a valve seat in a valve body tip of the injector.
  • the drainage channel is closed, and the needle body is moved back onto the valve seat by fuel flowing in via the inlet channel.
  • the injection is complete. It has now been observed that during the opening and closing operations of the injection channels and due to the pressure differences in the control chamber, pressure waves are triggered which directly influence the injection quantity accuracy and the multiple injection capability. With very short intervals between two injections, very large volume waves are produced in the previous injectors.
  • the storage volume is a storage space interconnected with the control space, which in turn in a further embodiment at least largely in a valve body of the In this case, all properties associated with a particular injector can be taken into account with regard to the design and the size of the storage volume. It is again provided in a further embodiment, that the storage space then extends to the control chamber along the valve body surrounding the needle body.
  • the memory space can be integrated without costly change of an injector in this.
  • the storage volume is greater than 1500 mm 3 , in particular greater than 2000 mm 3 .
  • the precise design depends on the size and design of the respective injector, wherein the tuning takes place in such a way that the quantity wave amplitudes experience maximum damping.
  • the injector has a partial length L1 extending in the valve body from the control chamber to a paragraph comprising a first substantial portion of the storage volume and a partial length L2 extending from the paragraph to a valve seat, wherein the ratio L1 to L2 is in the range of 1 to 1 to 1 to 3.
  • This aspect ratio is in turn dependent on the design and the size of the respective injector and is to be chosen so that the shaft travel times are set specifically and tuned to the natural frequency of the needle body.
  • the partial length L2 between 55 mm and 120 mm depending on the configuration and in particular the length of the respective injector.
  • the storage volume extends with its second portion over the entire part length L2 and indeed with a diameter D2 via a subsequent needle body spring chamber up to a valve seat.
  • the hydraulic flow area unthrottled from the shoulder to the sealing end portion, which in turn is achieved in a further embodiment in that the hydraulic flow area is greater than 2 mm 2 , in particular greater than 4 mm 2 .
  • Figure 2 shows a longitudinal section through a valve body of the injector with essential alternationen
  • Figure 3 in diagram form representable by the inventive design of the injector length amplitude fluctuations and pressure oscillations compared to a conventional injector.
  • FIG. 1 shows a fuel! Njektor, which is used in particular in common-rail injection systems for self-igniting internal combustion engines.
  • a common rail injection system is controlled by a high pressure pump fuel up to a pressure of about 3000 bar via a metering device to a high-pressure accumulator (rail) and stored in the high-pressure accumulator.
  • the fuel injector according to the invention is connected to the high-pressure accumulator via a high-pressure line, which is screwed to the connecting piece 1 of the fuel injector.
  • a filter 2 is used, which is intended to keep possible impurities in the fuel from the fuel injector.
  • the supplied via the connecting piece 1 fuel is supplied via an inlet channel 3 with throttle inserted a control chamber 4, which is arranged end of a needle body 5 in a needle body guide 6.
  • the needle body guide 6 is in turn arranged and fixed in a valve body 7, wherein the connecting piece 1 is screwed into the valve body 7.
  • an actuator module 8 is arranged, whose function will be described below.
  • a valve body tip 9 is attached to the valve body 7 by means of a union nut 10.
  • the needle body 5 extends with a needle body tip 1 1 into the end region of the Valve body tip 9 and forms a valve seat 19, from which in the needle body tip 1 1 injection channels 12, through which in the open state of the needle body 5 fuel is injected into the combustion chambers of the internal combustion engine, are shut off by the below-described fuel supply.
  • a storage space 16 in the valve body tip 9 surrounding the needle body 5 is connected.
  • the needle body 5 is further pressed by a arranged in the needle body spring chamber 18 needle body spring 13 in the direction of the valve seat 19 and thus supports the of the in the control chamber 4 prevailing fuel pressure exerted pressure force on the needle body. 5
  • the fuel pressure in the control chamber 4 is reduced until the upcoming fuel pressure the needle body 5 against the force of the needle body spring 13 in the direction to the control room 4 presses.
  • the control chamber 4 is connected via a drain channel 14 with an activated throttle to a valve 15 actuated by the actuator module 8, the valve 15 being connected to a low-pressure region of the fuel system on the actuator module side. If the valve 15 is moved by the actuator module 8 in its open position, fuel flows from the control chamber 4 via the drain passage 14 through the valve 15 in the low pressure region of the fuel system and the pressure in the control chamber 4 is consequently reduced.
  • the throttle in the inlet channel 3 and the outlet channel 14 are tuned so that more fuel can flow through the drain channel 14 as nachströmt through the inlet channel 3 into the control chamber 4.
  • control chamber 4 is connected to the storage space 16, which is arranged in the valve body 7 and the needle body 5 surrounding.
  • the storage space 16 extends with a large diameter and consequently large volume from the control chamber 4 to a first shoulder 17 in the valve body 7 and further with a smaller diameter via the needle body spring chamber 18 to the valve seat 19th
  • the storage space 16 extends with a length L1 from the control chamber 4 to the paragraph 17 with a relatively large diameter D1 and correspondingly large volume. From the shoulder 17, the effective storage space 16 extends over a region having a reduced diameter D2 in the needle body spring chamber 18 to the valve seat 19 (see Figure 1). By contrast, the length L2 is determined by the shoulder 17 and the valve seat 19 in the valve body tip 9. By selecting the ratio L1 / L2, the shaft travel times can be set specifically and tuned to the natural frequency of the needle body tip 11.
  • the diameter D2 is to be dimensioned so that an effective hydraulic flow area is given so that no throttling occurs between the needle body 5 and the valve body 7.
  • FIG. 3 shows a schematic diagram with the injection quantity Q over the time t.
  • the achieved and adjusted by the inventive design pressure swing curve is represented by a continuous graph, while the conventional pressure swing curve is represented by the graph shown in dashed lines. It can be seen that the vibration amplitudes are significantly reduced by the embodiment according to the invention.

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, notamment un injecteur de carburant pour un moteur à combustion interne, présentant un module actionneur (8) agissant sur une soupape (15) pour régler le débit d'un fluide, ladite soupape (15) reliant une chambre de commande (4), qui sert à commander un piston de commande, avec une zone basse pression. L'objectif de l'invention est de créer un injecteur présentant des fonctionnalités lui conférant une meilleure capacité d'injection multiple. A cet effet, la chambre de commande (4) est raccordée à un volume d'accumulation se présentant sous la forme d'une chambre d'accumulation (16) placée dans un corps de soupape (7) de l'injecteur.
PCT/EP2011/052321 2010-03-24 2011-02-17 Injecteur pour rampe commune comportant une soupape de commande à compensation de pression et un volume d'accumulation supplémentaire WO2011117029A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP11703700A EP2550446A1 (fr) 2010-03-24 2011-02-17 Injecteur pour rampe commune comportant une soupape de commande à compensation de pression et un volume d'accumulation supplémentaire
CN201180015351.4A CN102822496B (zh) 2010-03-24 2011-02-17 具有压力补偿的转换阀和附加的储存容积的共轨喷射器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010003202 DE102010003202A1 (de) 2010-03-24 2010-03-24 Common-Rail-Injektor mit druckausgeglichenem Schaltventil und zusätzlichem Speichervolumen
DE102010003202.6 2010-03-24

Publications (1)

Publication Number Publication Date
WO2011117029A1 true WO2011117029A1 (fr) 2011-09-29

Family

ID=43888627

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/052321 WO2011117029A1 (fr) 2010-03-24 2011-02-17 Injecteur pour rampe commune comportant une soupape de commande à compensation de pression et un volume d'accumulation supplémentaire

Country Status (4)

Country Link
EP (1) EP2550446A1 (fr)
CN (1) CN102822496B (fr)
DE (1) DE102010003202A1 (fr)
WO (1) WO2011117029A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011077618A1 (de) * 2011-06-16 2012-12-20 Robert Bosch Gmbh Injektor, insbesondere Kraftstoffinjektor für eine Brennkraftmaschine
DE102012222633A1 (de) 2012-12-10 2014-06-12 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
GB201505094D0 (en) * 2015-03-26 2015-05-06 Delphi International Operations Luxembourg S.�.R.L. Control valve arrangement
CN105673282B (zh) * 2016-04-08 2018-05-18 龙口龙泵燃油喷射有限公司 压力平衡阀式共轨喷油器

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002090755A1 (fr) * 2001-05-05 2002-11-14 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion
EP1967727A2 (fr) * 2007-03-08 2008-09-10 Robert Bosch Gmbh Injecteur de carburant doté d'un équipement amélioré d'une soupape de commande pour la commande d'une aiguille d'injection
DE102007044356A1 (de) 2007-09-17 2009-03-19 Robert Bosch Gmbh Injektor
DE102008001907A1 (de) * 2008-05-21 2009-11-26 Robert Bosch Gmbh Kraftstoff-Injektor
DE102008002527A1 (de) * 2008-06-19 2009-12-24 Robert Bosch Gmbh Kraftstoff-Injektor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005030868A1 (de) * 2005-07-01 2007-01-11 Robert Bosch Gmbh Kraftstoffeinspritzventile bei Kraftmaschinen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002090755A1 (fr) * 2001-05-05 2002-11-14 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion
EP1967727A2 (fr) * 2007-03-08 2008-09-10 Robert Bosch Gmbh Injecteur de carburant doté d'un équipement amélioré d'une soupape de commande pour la commande d'une aiguille d'injection
DE102007044356A1 (de) 2007-09-17 2009-03-19 Robert Bosch Gmbh Injektor
DE102008001907A1 (de) * 2008-05-21 2009-11-26 Robert Bosch Gmbh Kraftstoff-Injektor
DE102008002527A1 (de) * 2008-06-19 2009-12-24 Robert Bosch Gmbh Kraftstoff-Injektor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2550446A1 *

Also Published As

Publication number Publication date
CN102822496B (zh) 2015-12-16
CN102822496A (zh) 2012-12-12
EP2550446A1 (fr) 2013-01-30
DE102010003202A1 (de) 2011-09-29

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