WO2009132878A1 - Systèmes d'injection de carburant à alimentation en carburant non étranglée vers les injecteurs - Google Patents

Systèmes d'injection de carburant à alimentation en carburant non étranglée vers les injecteurs Download PDF

Info

Publication number
WO2009132878A1
WO2009132878A1 PCT/EP2009/052542 EP2009052542W WO2009132878A1 WO 2009132878 A1 WO2009132878 A1 WO 2009132878A1 EP 2009052542 W EP2009052542 W EP 2009052542W WO 2009132878 A1 WO2009132878 A1 WO 2009132878A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel injection
injection system
inlet
injector
fuel
Prior art date
Application number
PCT/EP2009/052542
Other languages
German (de)
English (en)
Inventor
Andreas Kellner
Matthias Burger
Martin Katz
Hans-Christoph Magel
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 EP09737922A priority Critical patent/EP2271836B1/fr
Publication of WO2009132878A1 publication Critical patent/WO2009132878A1/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
    • 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
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies

Definitions

  • the present invention relates to a fuel injection system of an internal combustion engine, in particular in a motor vehicle, having the features of the preamble of the claim
  • an injector which has an at least one injection hole injector body which contains a communicating with the at least one injection hole storage space for fuel.
  • Storage space is arranged a nozzle needle having at one end a needle tip for controlling a fuel injection through the at least one injection hole and the other end has a control piston.
  • the pressure in a control chamber can be controlled, which is axially limited by the control piston and radially by a arranged in the injector bearing sleeve, in which the control piston is axially displaced stroke.
  • annular inlet space is arranged, which is bounded radially outside of the injector body and radially inward of the bearing sleeve, wherein an injector extending in the inlet passage is provided, which opens one end in the inlet space and the other end to the fuel at a high pressure providing fuel supply can be connected , At least one
  • Inlet throttle connects the inlet chamber throttled with the control room.
  • the inlet space to the storage space is open or the supply space is in the storage space.
  • inlet chamber and storage space are connected to each other unthrottled.
  • the provision of such storage space within the injector body results in a reduction of pressure waves between the injector and the fuel supply to which the injector is connected. By reducing the interaction between the fuel supply and the injector, the injection processes can be realized more precisely. Especially with multiple injections, the spread of
  • High-pressure fuel line is formed, which serves as a high pressure source.
  • the fuel injection system according to the invention with the features of claim 1 has the opposite advantage that the inlet channel is unthrottled connected to the high pressure fuel supply source. As a result, interactions that arise through a rail throttle can be avoided. Due to the construction according to the invention can thus be dispensed with the rail throttle. For this purpose, according to the inlet channel in
  • unthrottled describes the circumstance that the inlet channel is connected to the fuel supply without a specific throttle point, so that the high pressure is applied to the inlet channel even during dynamic processes ,
  • the inlet channel throttled communicates with the storage space.
  • This is achieved by at least one closing throttle, via which the inlet channel is connected to the storage space.
  • at least one closing throttle pressure oscillations or pressure waves are transmitted only attenuated from the storage space into the inlet channel, whereby adverse interactions between the respective injector and the fuel supply can be reduced in addition to the damping effect of the large storage space.
  • On the other hand can be dispensed with by the use of at least one such closing throttle without significant disadvantage to a rail throttle.
  • the vote of the respective injector on the fuel injection system can then take place via the at least one closing throttle. As a result, the vote is greatly simplified.
  • the injector according to the invention allows the implementation of
  • the injector has a fuel port communicating with the storage space, to which a fuel supply providing the fuel under a high pressure can be connected.
  • an annular inlet space is provided, which is bounded radially on the outside of the injector body and radially inward of the bearing sleeve.
  • the aforementioned fuel connection opens in the inlet space.
  • it can have a feed channel extending in the injector body.
  • the injector has at least one inlet throttle, which throttles the inlet chamber with the control chamber.
  • the injector has at least one closing throttle, which connects the inlet space with the storage space.
  • the inlet space communicates more or less throttled with the storage space.
  • the injector according to the invention makes it possible to carry out injection processes with increased precision with regard to injection quantity and injection times.
  • the throttle effect of the closing throttle in comparison to the throttling effect of the inlet throttle is very small, so that only a slightly throttled connection between
  • the inlet space can be separated from the storage space by means of at least one sealing element.
  • Closing throttle surrounds the at least one sealing element.
  • the use of such a sealing element allows a comparatively simple structure for the injector to realize therein the separate from the storage space Zulaufraum.
  • Embodiments of the fuel injection system according to the invention are shown in the drawing and are explained in more detail below.
  • FIG. 1 shows a greatly simplified principle longitudinal section through a
  • an injector 1 comprises an injector body 2, which may be assembled, for example, from a plurality of separate sections 3a, 3b, 3c and 3d.
  • the injector body 2 has at least one injection hole 4, through which an injection of fuel into an injection space 5 can be carried out. If several spray holes 4 are provided, their arrangement is advantageously star-shaped with respect to a
  • the injector body 2 contains a storage space 6, which communicates with the at least one injection hole 4. Furthermore, the injector body 2 has an inlet channel 7 which extends in the injector body 2 and to which a fuel supply 8 is connected in the installed state shown. The fuel supply 8 is in the operation of the injector 1 under a high pressure fuel
  • the fuel supply 8 has a high-pressure line 9, which also serves as a high-pressure source or as an accumulator.
  • the high-pressure line 9 is connected on the output side via a supply line 10 to the inlet channel 7 of the respective injector 1.
  • a so-called common rail system a plurality of injectors 1 are separate
  • Supply lines 10 connected to a common high-pressure line 9.
  • the high pressure line 9 is connected on the input side via a supply line 11 to a high pressure fuel pump, not shown here.
  • the fuel supply 8 as well as the respective injector 1 forms part of a fuel injection system 41 of an internal combustion engine, which is otherwise not shown, in particular in a
  • Motor vehicle may be arranged.
  • the injector 1 has a nozzle needle 12, which is arranged for this purpose in the storage space 6 in a stroke-adjustable manner.
  • the nozzle needle 12 is arranged in the storage chamber 6 so that it is enveloped by the storage space 6 substantially over its entire axial length and quasi floats in the fuel.
  • the nozzle needle 12 has at a the at least one injection port 4 facing the end of a needle tip 13, by means of which a fuel injection through the at least one spray hole 4 is controllable.
  • the nozzle needle 12 has a control piston 14, which on a side facing away from the needle tip 13 a side
  • Control surface 15 has. As can be seen, this is a so-called "long needle", which can have, for example, a length of 100 mm or more, which is made of one piece or consists of a fixed combination of several needle parts which are suitably connected to one another Control surface 15 of the control piston 14 axially bounds a control chamber 16 which is bordered or bounded radially by a bearing sleeve 17 is.
  • the control piston 14 is arranged in this bearing sleeve 17 axially guided hub adjustable.
  • control device 18 In order to control the pressure in the control chamber 16, a control device 18 is provided. This control device 18 is in the region of the control piston 14 in
  • the control device 18 here has an electromagnetically operating control valve 19. This has in a low-pressure chamber 20 on a valve member 21 which is actuated by means of an electromagnet 22 for carrying out a ⁇ ffhungshubs and which is driven by means of a return spring 23 in a closed position.
  • the valve member 21 controls a throttled Wegsöffhung 24, which connects the control chamber 16 with the low-pressure chamber 20.
  • the connection opening 24 is formed in a plate body 25 which separates a needle region of the injector body 2 containing the nozzle needle 12 from a control region containing the control device 18.
  • the low-pressure space 20 communicates via a low-pressure connection 26 with a comparatively pressure-free return.
  • the low-pressure chamber 20 is supplied via a leakage in the region of the plate body 25 between the needle region and the control region of the injector body 2.
  • a tolerable leakage quantity passes into an annular space 27 which surrounds the control device 18 and which via at least one bore 28 with the low-pressure chamber 20 communicates.
  • the bearing sleeve 17 can be supported axially on the plate body 25 without being attached thereto. Likewise, the bearing sleeve 17 may be attached to the plate body 25. Also, the plate body 25 may be integrally formed with the bearing sleeve 17.
  • control device 18 in principle also another construction can be realized, for example with a piezoelectric actuator.
  • annular inlet chamber 29 is formed in the injector body 2. This is bounded radially on the outside by the injector body 2 and radially inward by the bearing body 17. In the axial direction of the feed chamber 29 is bounded on the one hand by the plate body 25 and on the other hand by an annular sealing element 30. In this inlet chamber 29, the inlet channel 7 opens. As a result, the inlet space 29 is coupled directly to the fuel supply 8 or to the high-pressure line 9. In particular, this coupling can be realized essentially unthrottled. In the consequence prevails in the Inlet chamber 29, even in highly dynamic processes substantially always the high pressure of the high pressure line 9.
  • the injector 1 also has at least one inlet throttle 31. This creates a throttled connection between the inlet chamber 29 and the control chamber 16.
  • the injector 1 has at least one closing throttle 32, which connects the inlet chamber 29 with the storage chamber 6.
  • the closing throttle 32 bypasses the sealing element 30 in a suitable manner.
  • the closing throttle 32 passes through the bearing sleeve 17, in particular in the radial direction.
  • an annular space 33 is formed in the bearing sleeve 17 at a side applied by the control chamber 16 side of the control piston 14.
  • This annular space 33 is realized, for example, by virtue of the fact that the control piston 14 has a larger diameter than the adjoining body of the nozzle needle 12.
  • the annular space 33 is open to the storage space 6, so that ultimately the supply space 29 via the closing throttle 32 and via the annular space 33 is connected to the memory space 6.
  • Said annular space 33 is limited in the axial direction on the one hand by the control piston 14 and on the other hand open. In the radial direction, the annular space 33 is bounded on the outside by the bearing sleeve 17 and inside by the nozzle needle 12.
  • a closing compression spring 34 is provided. This is in the example on the one hand in an axial end face of the bearing sleeve 17 and on the other hand axially supported on a collar 35, wherein the collar 35 is formed or fixed to the nozzle needle 12.
  • the injector 1 has a centering sleeve 36. This is mounted axially adjustable on the needle tip 13.
  • the centering sleeve 36 is supported axially on the one hand on the injector body 2 and on the other hand via an opening pressure spring 37 on the nozzle needle 12, for which purpose it has a further collar 38.
  • the needle tip 13 is arranged axially displaced in the centering sleeve 36.
  • the centering sleeve 36 realizes a centering of the needle tip 13 relative to a needle seat 39 which is formed in the injector body 2.
  • the centering sleeve 36 may have at least one transverse bore 40.
  • the throttle effect is considerably smaller than the throttling effect of the inlet throttle 31, on the one hand ensures that pressure waves that arise when opening and closing the nozzle needle 12 in the storage space 6, only steamed or throttled get to the inlet chamber 29 and Accordingly, only steamed to reach the fuel supply 8.
  • the already provided by the relatively large volume memory space 6 damping effect is additionally strengthened.
  • the fine-tuning of the respective injector 1 with the fuel injection system can over the at least one
  • Closing throttle 32 can be realized. This fine-tuning can be performed more accurately than is possible in conjunction with a rail throttle. Overall, injection processes, in particular with multiple injections, can be realized with increased precision with regard to injection duration and injection quantity.
  • the injector 1 works as follows:
  • the control device 18 To carry out an injection of fuel, the control device 18 is driven accordingly. As a result, the solenoid 22 attracts the valve member 21 against the biasing force of the return spring 23, whereby the connection opening 24 is opened. As a result, the pressure in the control chamber 16 drops. Consequently, the hydraulic forces acting in the closing direction on the nozzle needle 12, via the control surface 15, also decrease. Once in the direction of opening at the Nozzle needle 12 predominate effective hydraulic forces, lifts them with their needle tip 13 from the needle seat 39 from. Subsequently, fuel can enter under high pressure from the storage space 6 through the injection holes 4 in the injection chamber 5. To end the injection process, the control device 18 is actuated to close the control valve 19. For this purpose, the energization of the electromagnet 22 is stopped.
  • the return spring 23 can drive the valve member 21 to close the communication hole 24.
  • About the inlet throttle 31 can in the control chamber 16 again build the high pressure and retract the control piston 14 and thus the nozzle needle 12 with its needle tip 13 in the needle seat 39 via the control surface 15. This closing movement is supported by the closing compression spring 34.
  • the throttling action of the closing throttle 32 is comparatively small, as a result of which sufficient fuel can always flow in to realize the desired injection process. On the other hand, this can be fast closing operations with high

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 système d'injection de carburant (41) comprenant au moins un injecteur (1), une chambre de retenue (6) étant placée dans un corps d'injecteur (2), dans laquelle se trouve une aiguille d'injecteur (12). Une alimentation en carburant (8) dirige le carburant sous pression vers une chambre d'arrivée (29) par l'intermédiaire d'un canal d'alimentation (7). L'objectif de l'invention est de simplifier la mise au point du système d'injection en carburant (41). A cet effet, le canal d'alimentation (7) communique de manière non étranglée avec une source haute pression (9). La mise au point de l'injecteur à l'aide du système d'injection de carburant est réalisée par un papillon de fermeture (32).
PCT/EP2009/052542 2008-04-28 2009-03-04 Systèmes d'injection de carburant à alimentation en carburant non étranglée vers les injecteurs WO2009132878A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09737922A EP2271836B1 (fr) 2008-04-28 2009-03-04 Systèmes d'injection de carburant à alimentation en carburant non étranglée vers les injecteurs

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008001423.0 2008-04-28
DE200810001423 DE102008001423A1 (de) 2008-04-28 2008-04-28 Kraftstoffeinspritzanlage

Publications (1)

Publication Number Publication Date
WO2009132878A1 true WO2009132878A1 (fr) 2009-11-05

Family

ID=40852559

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/052542 WO2009132878A1 (fr) 2008-04-28 2009-03-04 Systèmes d'injection de carburant à alimentation en carburant non étranglée vers les injecteurs

Country Status (3)

Country Link
EP (1) EP2271836B1 (fr)
DE (1) DE102008001423A1 (fr)
WO (1) WO2009132878A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016201539A1 (de) 2015-12-21 2017-06-22 Robert Bosch Gmbh Kraftstoffinjektor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1873393A1 (fr) * 2006-06-27 2008-01-02 Robert Bosch Gmbh Injecteur
WO2008015039A1 (fr) * 2006-08-04 2008-02-07 Robert Bosch Gmbh Injecteur pour un système d'injection de carburant
EP1990532A1 (fr) * 2007-05-07 2008-11-12 Robert Bosch GmbH Injecteur de carburant pour un moteur à combustion interne comprenant un système d'injection à rampe commune

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007011685A1 (de) 2007-03-09 2008-09-11 Robert Bosch Gmbh Kraftstoffinjektor mit verbessertem Steuerventil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1873393A1 (fr) * 2006-06-27 2008-01-02 Robert Bosch Gmbh Injecteur
WO2008015039A1 (fr) * 2006-08-04 2008-02-07 Robert Bosch Gmbh Injecteur pour un système d'injection de carburant
EP1990532A1 (fr) * 2007-05-07 2008-11-12 Robert Bosch GmbH Injecteur de carburant pour un moteur à combustion interne comprenant un système d'injection à rampe commune

Also Published As

Publication number Publication date
DE102008001423A1 (de) 2009-10-29
EP2271836A1 (fr) 2011-01-12
EP2271836B1 (fr) 2012-12-12

Similar Documents

Publication Publication Date Title
EP1714025B1 (fr) Injecteur de carburant avec obturateur d'injection a commande directe
EP1636484B1 (fr) Injecteur pour moteurs a combustion interne
EP1853813B1 (fr) Injecteur
WO2008138800A1 (fr) Injecteur à actionneur piézoélectrique
EP2108080A1 (fr) Injecteur pour injecter du carburant dans les chambres de combustion des moteurs à combustion interne
WO2017144185A1 (fr) Soupape d'admission à commande électromagnétique et pompe haute pression munie d'une soupape d'admission
DE10060812A1 (de) Kraftstoffeinspritzsystem für Brennkraftmaschinen
EP1865192B1 (fr) Injecteur de carburant doté d'une assistance adaptative à la direction
EP1363015A1 (fr) Système d'injection de carburant pour un moteur à combustion interne
EP2310662B1 (fr) Injecteur de carburant
EP2294309B1 (fr) Injecteur de carburant
WO2009141182A1 (fr) Injecteur de carburant
WO2002073028A2 (fr) Soupape a siege/coulisse comportant une tige de compensation de pression
EP1483498A1 (fr) Dispositif d'injection de carburant pour un moteur a combustion interne
EP2271836B1 (fr) Systèmes d'injection de carburant à alimentation en carburant non étranglée vers les injecteurs
EP2022975B1 (fr) Injecteur
DE102010042251A1 (de) Kraftstoffinjektor für eine Brennkraftmaschine
DE102007001365A1 (de) Injektor mit Steuer- und Schaltkammer
EP2439398A1 (fr) Soupape d'injection de combustible
WO2017108343A1 (fr) Soupape d'admission à commande électromagnétique et pompe haute pression munie d'une soupape d'admission
DE102016201539A1 (de) Kraftstoffinjektor
WO2017050463A1 (fr) Soupape d'admission à commande électromagnétique et pompe haute pression munie d'une soupape d'admission
EP1908953A2 (fr) Dispositif d'injection de carburant
DE102008001420A1 (de) Kraftstoffinjektor
DE10326257A1 (de) Ventil zum Steuern von Flüssigkeiten

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: 09737922

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2009737922

Country of ref document: EP