EP2426349A1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP2426349A1
EP2426349A1 EP20110174533 EP11174533A EP2426349A1 EP 2426349 A1 EP2426349 A1 EP 2426349A1 EP 20110174533 EP20110174533 EP 20110174533 EP 11174533 A EP11174533 A EP 11174533A EP 2426349 A1 EP2426349 A1 EP 2426349A1
Authority
EP
European Patent Office
Prior art keywords
control chamber
nozzle needle
fuel injector
delay element
pressure
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.)
Granted
Application number
EP20110174533
Other languages
German (de)
English (en)
Other versions
EP2426349B1 (fr
Inventor
Andreas Koeninger
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 EP2426349A1 publication Critical patent/EP2426349A1/fr
Application granted granted Critical
Publication of EP2426349B1 publication Critical patent/EP2426349B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • 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
    • F02M2547/001—Control chambers formed by movable sleeves
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0045—Three-way valves

Definitions

  • the invention relates to a fuel injector for a fuel injection system, in particular a common rail injection system, for injecting fuel into the combustion chamber of an internal combustion engine with the features of the preamble of claim 1.
  • the present invention seeks to provide a fuel injector of the type mentioned with improved Kleinstmengengive.
  • the fuel injector should be simple and inexpensive to produce.
  • the hydraulic connection of the two sections preferably takes place via a remaining annular gap between the retardation element and an inner circumferential surface radially delimiting the control chamber.
  • the size of the annular gap is chosen such that the outflow of the fuel from the first control chamber section is throttled into the second control chamber section. In this case, a defined initial position and consequently a defined throttle effect on the volume ratio of the two control chamber sections is ensured via the axial bias of the delay element.
  • a spring element is received in the control chamber for the axial bias of the delay element.
  • the spring element may for example be a coil spring, a plate spring or a corrugated spring.
  • the delay element is at least partially elastically deformable.
  • the axial prestressing of the retardation element can accordingly also be effected or at least supported by an at least partially elastic deformation of the retardation element.
  • the invention can be used to improve the minimum quantity capability, in particular in the case of fuel injectors with a large valve chamber volume and / or with a seat hole nozzle.
  • the invention can be used in all known injector concepts.
  • the delay element accommodated in the control chamber throttles the outflow of the fuel so that the pressure reduction and thus the opening of the nozzle needle is delayed.
  • the adjustment of the throttling effect takes place via the size of the between the delay element and the Control chamber radially limiting inner peripheral surface remaining throttle gap.
  • the delay of the Nadelö Anlagenmaschine Anlagenсти can be further set by setting the following parameters: volume ratio of the two control chamber sections, axial biasing force of the delay element, hydraulic design of the drain and / or the inlet throttle and / or needle seat diameter.
  • a first embodiment of a fuel injector according to the invention is the Fig. 1 a and 1 b, where the Fig. 1b a section of the Fig. 1 a in the area of the control room 5 shows (see dashed line).
  • the in the Fig. 1a and 1b shown fuel injector comprises a nozzle body 3 with a high-pressure bore 2, in which a nozzle needle 1 for releasing and closing at least one injection port 4 is received in a liftable manner.
  • the nozzle change 1 bounded in the axial direction of a control chamber 5, which is also formed in the high-pressure bore 2 and which is connected to the discharge via a drain passage 6 with a low pressure region 7.
  • the drain channel 6 is formed in a housing part 11 which limits the control chamber 5 in the axial direction.
  • the housing part 11 has an opening into the control chamber 5 inlet channel 13, passes through the fuel into the control chamber 5.
  • the control chamber 5 When connecting the control chamber 5 with the low pressure area 7, the control chamber 5 is relieved, that is, the prevailing in the control chamber 5 control chamber pressure drops. The pressure drop in the control chamber 5 in turn causes the nozzle needle 1 opens.
  • a spherical retardation element 8 is arranged in the control chamber 5, which is biased by the spring force of a spring element 10 in the form of a supported on the housing part 11 helical compression spring, axially against the nozzle needle 1. Due to the spherical shape of the delay element 8, a first control chamber section 5. 1 is formed between the ball and the nozzle needle 1, which is connected via a throttle 9 serving as an annular gap between the ball and the high pressure bore 2 in hydraulic communication with a second control chamber section 5.2.
  • the throttle 9 causes that at a pressure drop in the second control chamber section 5.2, the pressure drop in the first control chamber section 5.1 occurs only with delay, so that the opening stroke of the nozzle needle 1 is also delayed.
  • the injection process begins, wherein fuel under high pressure is injected via the at least one injection opening 4 into the combustion chamber of the internal combustion engine.
  • the fuel is supplied to the at least one injection port 4 via a fuel supply 14 and the high-pressure bore 2.
  • Fig. 3 From the diagram of Fig. 3 can be the time-delayed opening stroke of the nozzle needle 1 read clearly.
  • the time is plotted on the x-axis, while is plotted on the y-axis of the stroke of the nozzle needle 1 and the delay element 8 in conjunction with the pressure drop or Duck rise in the two control space sections 5.1 and 5.2.
  • the curve b) shows the pressure drop or increase over time in the second control chamber section 5.2, which is connectable via the drain channel 6 with the low pressure region 7.
  • the curve a) shows the contrast, delayed pressure drop in the first control chamber section 5.1, which is bounded by the nozzle needle 1 and the delay element 8. Similarly, the opening stroke of the nozzle needle 1 is delayed (see curve c).
  • the needle opens when there is equilibrium between the needle seating force and the pressure force in the first control chamber 5.1.
  • the needle opening is preceded by an "opening" of the delay element 8, when the pressure difference in both control space sections 5.1 and 5.2 corresponds to the axial biasing force of the delay element 8.

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)
EP11174533.7A 2010-09-07 2011-07-19 Injecteur de carburant Not-in-force EP2426349B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010040316A DE102010040316A1 (de) 2010-09-07 2010-09-07 Kraftstoffinjektor

Publications (2)

Publication Number Publication Date
EP2426349A1 true EP2426349A1 (fr) 2012-03-07
EP2426349B1 EP2426349B1 (fr) 2015-07-01

Family

ID=44582249

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11174533.7A Not-in-force EP2426349B1 (fr) 2010-09-07 2011-07-19 Injecteur de carburant

Country Status (2)

Country Link
EP (1) EP2426349B1 (fr)
DE (1) DE102010040316A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013002969B3 (de) 2013-02-22 2014-05-22 L'orange Gmbh Kraftstoffinjektor

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0393590A2 (fr) * 1989-04-17 1990-10-24 Nippondenso Co., Ltd. Dispositif d'injection de combustible pour moteurs diesel
EP0582993A1 (fr) * 1992-08-11 1994-02-16 Nippondenso Co., Ltd. Dispositif d'injection de carburant avec accumulateur
EP1186773A2 (fr) * 2000-09-06 2002-03-13 Toyota Jidosha Kabushiki Kaisha Injecteur de combustible
DE10164123A1 (de) 2001-12-24 2003-01-30 Bosch Gmbh Robert Kraftstoff-Einspritzvorrichtung
DE102004005451A1 (de) * 2004-02-04 2005-08-25 Robert Bosch Gmbh Kraftstoffeinspritzsystem für Brennkraftmaschinen
DE102005027853A1 (de) 2005-06-16 2006-12-21 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
WO2009153086A1 (fr) * 2008-06-19 2009-12-23 Robert Bosch Gmbh Injecteur de carburant

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5493966B2 (ja) * 2009-06-02 2014-05-14 株式会社デンソー 燃料噴射装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0393590A2 (fr) * 1989-04-17 1990-10-24 Nippondenso Co., Ltd. Dispositif d'injection de combustible pour moteurs diesel
EP0582993A1 (fr) * 1992-08-11 1994-02-16 Nippondenso Co., Ltd. Dispositif d'injection de carburant avec accumulateur
EP1186773A2 (fr) * 2000-09-06 2002-03-13 Toyota Jidosha Kabushiki Kaisha Injecteur de combustible
DE10164123A1 (de) 2001-12-24 2003-01-30 Bosch Gmbh Robert Kraftstoff-Einspritzvorrichtung
DE102004005451A1 (de) * 2004-02-04 2005-08-25 Robert Bosch Gmbh Kraftstoffeinspritzsystem für Brennkraftmaschinen
DE102005027853A1 (de) 2005-06-16 2006-12-21 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
WO2009153086A1 (fr) * 2008-06-19 2009-12-23 Robert Bosch Gmbh Injecteur de carburant

Also Published As

Publication number Publication date
EP2426349B1 (fr) 2015-07-01
DE102010040316A1 (de) 2012-03-08

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