EP1604105B1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

Info

Publication number
EP1604105B1
EP1604105B1 EP04705047A EP04705047A EP1604105B1 EP 1604105 B1 EP1604105 B1 EP 1604105B1 EP 04705047 A EP04705047 A EP 04705047A EP 04705047 A EP04705047 A EP 04705047A EP 1604105 B1 EP1604105 B1 EP 1604105B1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection valve
piston
actuator
valve according
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.)
Expired - Lifetime
Application number
EP04705047A
Other languages
German (de)
English (en)
Other versions
EP1604105A1 (fr
Inventor
Thomas Gerschwitz
Klaus Noller
Fevzi Yildirim
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 EP1604105A1 publication Critical patent/EP1604105A1/fr
Application granted granted Critical
Publication of EP1604105B1 publication Critical patent/EP1604105B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F02M61/08—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 the valves opening in direction of fuel flow
    • 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
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • 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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/167—Means for compensating clearance or thermal expansion

Definitions

  • the invention relates to a fuel injection valve according to the preamble of claim 1.
  • a fuel injection valve with a piezoelectric actuator known, which is in operative connection with a valve needle and thereby supported by a hydraulic coupler.
  • the hydraulic coupler comprises a damping piston, which engages in a blind bore in a valve bonnet. A formed between damping piston and blind hole gap is filled with a hydraulic fluid.
  • An annular membrane encloses a free end of the gap and forms a hydraulic fluid filled compensating space.
  • the piezo actuator has length changes due to mechanical, thermal and electrical loads .
  • the change in length of the piezo actuator which was effected by electrical control, is used selectively to generate the valve lift.
  • the hydraulic coupler loses hydraulic fluid during the injection phase via the leakage gap between the blind bore and the damping piston. This leads to a loss of stroke on the valve needle.
  • the piezo actuator is activated for a maximum of 2ms.
  • the coupler gap is designed in this case so that the Leakage losses are minimized on the one hand and on the other hand, the damping piston is positioned again during the filling phase.
  • the fuel injection valve according to the invention with the features of the independent claim 1 has the advantage that fluctuations in the system pressure can be compensated by the pressure piston is designed as a differential piston, to which a fuel pressure is applied.
  • hydraulic coupler returns to its initial position after a short injection break, wherein the coupler gap fills again with hydraulic fluid.
  • the formation of an at least partially filled with hydraulic fluid compensation chamber within the piston ensures effective load compensation and reliable filling of the coupler gap.
  • the use of an elastic membrane to limit the compensation space has the advantage that thermal and mechanical loads in the form of acting on the hydraulic fluid pressure or volume subscribed be compensated by the membrane.
  • the membrane may be advantageously formed by a corrugated tube.
  • the hydraulic fluid in the compensation chamber is acted upon by a compensation piston. In this way, the hydraulic fluid of the compensation chamber can be kept largely under constant pressure.
  • a fuel injection valve 1 shown in a longitudinal section in FIG. 1 is used in particular for the direct injection of fuel into a combustion space of a mixture-compressing, spark-ignited internal combustion engine.
  • a piezoelectric actuator 3 In a housing 2 coaxial with each other, a piezoelectric actuator 3, a hydraulic coupler 4 and a valve unit 5 are arranged.
  • the valve unit 5 has a valve needle 6, which carries a valve closing body 7 at its discharge end.
  • the valve closing body 7 forms with a valve seat surface 12 a sealing seat 13 of the valve unit 5.
  • the valve needle 6 has a collar 8, on which a valve spring 9 is supported.
  • the valve spring 9 bears against an inwardly projecting collar 10 of the housing 2 and urges the valve needle 6 axially in the direction of a closed position of the sealing seat 13.
  • the piezoelectric actuator 3 is encapsulated in a sleeve 15 and axially biased by a biasing spring 16. Between the actuator 3 and the valve needle 6, a pin-shaped actuating element 17 is interposed, which transmits an axial displacement of the actuator 3 for opening the sealing seat 13 on the valve needle 6. Between a actuator-side end of the valve needle 6 and the sleeve 15 is formed as a corrugated tube diaphragm 18 which seals a located within the sleeve 15 actuator chamber 19 against a located between the sleeve 15 and the housing 2 valve interior 20. The valve interior 20 is filled with fuel.
  • the actuator chamber 19 is delimited by an actuator head 22, on which the actuator 3 is axially supported on the front side.
  • the actuator head 22 is axially displaceable relative to the housing 2.
  • the piston 25 is formed as a cylindrical projection on a coupler head 26 and partially engages in the receiving opening 24 a.
  • a coupler gap 27 is formed, which is filled with a hydraulic fluid.
  • the coupler gap 27 opens outside the receiving opening 24 in a compensation chamber 28 which is bounded by a sealing membrane 29.
  • the sealing membrane 29 is attached on the one hand to an outer wall of the extension 23 and on the other hand to the coupler head 26, preferably soldered or welded.
  • the sealing membrane 29 is sleeve-shaped preferably formed as a corrugated tube.
  • the coupler head 26 is flanged on the end face on a lid 30 delimiting the valve interior 20 and welded thereto.
  • the cover 30 is axially penetrated by an electrical line 34 for controlling the actuator 3.
  • a blind hole 35 located in the lid 30, a blind hole 35 which is connected via a transverse bore 36 with an axial fuel line 37.
  • the blind hole 35, the transverse bore 36 and the fuel line 37 serve to supply the fuel injection valve 1 with fuel.
  • a coupler spring 38 is arranged, which acts on the actuator head 22 against the valve spring 9, so that in the rest position of the actuator 3, a defined coupler gap 27 between the piston 25 and the actuator head 22 at a bottom of the receiving opening 24 forms.
  • a cavity 40 which is connected to the coupler gap 27 via a throttle opening 41 with a reduced flow cross-section.
  • the cavity 40 is filled with the hydraulic fluid and forms a compensation chamber 42.
  • the function of the fuel injection valve 1 is as follows: in its rest position, the fuel injection valve 1 assumes the position shown in Figure 1. Upon activation of the actuator 3 learns this one Elongation, which is transmitted via the actuating element 17 to the valve needle 6, so that the valve closing body 7 lifts off from the valve seat surface 12 and the fuel injection valve 1 opens. Since the extension and subsequent shortening of the actuator 3 are very fast, the coupler gap 27 remains largely filled with hydraulic fluid, so that the actuator head 22 can be supported axially via the hydraulic fluid at the coupler head 26. Changes in length of the actuator 3 as a result of thermal or mechanical loads are compensated by the hydraulic fluid in which this flow to the compensation chamber 24 or the compensation chamber 42 or can flow from there.
  • FIG. 2 shows a second exemplary embodiment of a fuel injection valve 1.
  • a compensation piston 43 is provided in the cavity 40, which seals the compensation chamber 42 against a spring chamber 45 via a sealing ring 44 on its outer circumference.
  • an axial compression spring 46 is provided in the spring chamber 45 in the spring chamber 45 , which exerts a pressure on the hydraulic fluid in the compensation chamber 42 via the piston 25. With the help of the balance piston 43, the volume of the balance chamber 42 can be changed.
  • FIG. 3 shows a first exemplary embodiment of a fuel injection valve 1 according to the invention.
  • the cavity 40 is open to the fuel-carrying blind hole 35.
  • a gap 50 is adjacent to the cavity 40.
  • the gap 50 is in turn connected via a throttle line 51 with the blind hole 35, so that there is fuel pressure in the gap 50.
  • the compensating piston 43 carries on the fuel side a cylindrical nose 52, on which acts in the intermediate space 50 fuel pressure.
  • the compensating piston 43 is thus designed as a differential piston 53 in this embodiment.
  • On a compression spring 46 has been omitted. Likewise, no coupler spring 38 is present in this embodiment.
  • FIG. 4 shows a variant of the exemplary embodiment according to FIG. 3.
  • the compensating piston 43 is likewise designed as a differential piston 53, on which, in addition to the fuel pressure in the intermediate space 50, the force of the compression spring 46 acts, which is supported on a shoulder 55 within the cavity 40 ,
  • the invention is not limited to the illustrated embodiments and, for example, for other designs of fuel injector 1 such.
  • B internal fuel injector or fuel injection valves with electrostrictive or magnetostrictive actuators suitable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (8)

  1. Injecteur de carburant, comportant un actionneur piézoélectrique, électrostrictif ou magnétostrictif (3), une aiguille d'injecteur (6) en liaison active avec l'actionneur (3) et sollicitée en direction de fermeture par un ressort de soupape (9) exerçant une force de rappel pour actionner un obturateur de soupape (7), et un coupleur hydraulique (4) comprenant un piston (25) pénétrant au moins partiellement dans une ouverture de réception (24) prévue sur une tête d'actionneur (22) de l'actionneur (3) et formant avec celle-ci une fente de coupleur (27) remplie d'un fluide hydraulique, avec une cavité (40) ouverte vers la fente de coupleur (27) et formée dans le piston (25), qui est remplie au moins partiellement avec le fluide hydraulique et forme une chambre d'équilibrage (42) logeant un piston d'équilibrage (43),
    caractérisé en ce que
    le piston d'équilibrage (43) est un piston différentiel (53), et une pression de carburant agit sur la face du piston différentiel (53) sur sa face opposée à la chambre d'équilibrage (42).
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce qu'
    entre la chambre d'équilibrage (42) et la fente de coupleur (27) un orifice d'étranglement (41) a une section transversale d'écoulement diminuée.
  3. Injecteur de carburant selon la revendication 1 et 2,
    caractérisé en ce que
    la fente de coupleur (27) débouche hors de l'ouverture de réception (24) dans une chambre d'équilibrage (28) également remplie du fluide hydraulique et délimitée par une membrane d'étanchéité (29).
  4. Injecteur de carburant selon la revendication 3,
    caractérisé en ce que
    la membrane d'étanchéité (29) est un tube ondulé.
  5. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    le piston d'équilibrage (43) est sollicité par la force d'un ressort de pression (46).
  6. Injecteur de carburant selon la revendication 5,
    caractérisé en ce que
    la force du ressort de pression (46) sollicite en plus le piston différentiel (53).
  7. Injecteur de carburant selon la revendication 1 ou 5,
    caractérisé en ce que
    le piston différentiel (53) est équipé d'un ergot cylindrique (52) faisant saillie dans une chambre intermédiaire (50) remplie de carburant.
  8. Injecteur de carburant selon la revendication 6,
    caractérisé en ce que
    la chambre intermédiaire (50) est reliée par une conduite d'étranglement (51) à un trou borgne (35) servant à l'alimentation en carburant de l'injecteur de carburant (1).
EP04705047A 2003-03-11 2004-01-26 Soupape d'injection de carburant Expired - Lifetime EP1604105B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10310499 2003-03-11
DE10310499A DE10310499A1 (de) 2003-03-11 2003-03-11 Brennstoffeinspritzventil
PCT/DE2004/000112 WO2004081372A1 (fr) 2003-03-11 2004-01-26 Soupape d'injection de carburant

Publications (2)

Publication Number Publication Date
EP1604105A1 EP1604105A1 (fr) 2005-12-14
EP1604105B1 true EP1604105B1 (fr) 2007-08-15

Family

ID=32892020

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04705047A Expired - Lifetime EP1604105B1 (fr) 2003-03-11 2004-01-26 Soupape d'injection de carburant

Country Status (6)

Country Link
US (1) US20060043213A1 (fr)
EP (1) EP1604105B1 (fr)
JP (1) JP2006510848A (fr)
AT (1) ATE370324T1 (fr)
DE (2) DE10310499A1 (fr)
WO (1) WO2004081372A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10357189A1 (de) * 2003-12-08 2005-07-07 Robert Bosch Gmbh Brennstoffeinspritzventil
EP1763462B1 (fr) 2004-07-07 2010-01-13 Continental Automotive GmbH Frein de stationnement electronique et procede de commande d'un frein de ce type
EP1816341B1 (fr) 2006-02-03 2011-04-27 Continental Automotive GmbH Unité d'actionnement pour buse d'injection et buse d'injection
EP2078846B1 (fr) 2008-01-14 2014-12-03 Continental Automotive GmbH Agencement d'actionneur et soupape à injection
FI121719B (fi) * 2009-05-28 2011-03-15 Waertsilae Finland Oy Polttoaineen ruiskutusventtiili
DE102012202909A1 (de) * 2012-02-27 2013-08-29 Robert Bosch Gmbh Ventil zum Zumessen von Fluid
DE102012204216A1 (de) * 2012-03-16 2013-09-19 Robert Bosch Gmbh Baugruppe
US8646432B1 (en) * 2012-10-11 2014-02-11 Mcalister Technologies, Llc Fluid insulated injector-igniter
DE102013219225A1 (de) * 2013-09-25 2015-03-26 Continental Automotive Gmbh Piezo-Injektor zur Kraftstoff-Direkteinspritzung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2661243A (en) * 1951-01-02 1953-12-01 Phillips Petroleum Co Viscosity compensating variablearea fuel nozzle
DE19962177A1 (de) * 1999-12-22 2001-07-12 Siemens Ag Hydraulische Vorrichtung zum Übertragen einer Aktorbewegung
EP1325225B1 (fr) * 2000-10-11 2007-08-08 Siemens VDO Automotive Corporation Ensemble compensateur pour injecteur de carburant
DE10133265A1 (de) * 2001-07-09 2003-01-23 Bosch Gmbh Robert Brennstoffeinspritzventil
US6766965B2 (en) * 2001-08-31 2004-07-27 Siemens Automotive Corporation Twin tube hydraulic compensator for a fuel injector
US6749127B2 (en) * 2002-02-11 2004-06-15 Siemens Vdo Automotive Corporation Method of filling fluid in a thermal compensator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP1604105A1 (fr) 2005-12-14
JP2006510848A (ja) 2006-03-30
DE502004004646D1 (de) 2007-09-27
ATE370324T1 (de) 2007-09-15
US20060043213A1 (en) 2006-03-02
DE10310499A1 (de) 2004-09-23
WO2004081372A1 (fr) 2004-09-23

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