EP1203882A2 - Injecteur - Google Patents

Injecteur Download PDF

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Publication number
EP1203882A2
EP1203882A2 EP01123491A EP01123491A EP1203882A2 EP 1203882 A2 EP1203882 A2 EP 1203882A2 EP 01123491 A EP01123491 A EP 01123491A EP 01123491 A EP01123491 A EP 01123491A EP 1203882 A2 EP1203882 A2 EP 1203882A2
Authority
EP
European Patent Office
Prior art keywords
injection
pressure
nozzle
nozzle needle
control chamber
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.)
Withdrawn
Application number
EP01123491A
Other languages
German (de)
English (en)
Other versions
EP1203882A3 (fr
Inventor
Bernd Mahr
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 EP1203882A2 publication Critical patent/EP1203882A2/fr
Publication of EP1203882A3 publication Critical patent/EP1203882A3/fr
Withdrawn legal-status Critical Current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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
    • 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
    • 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
    • F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
    • F02M63/0007—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using electrically actuated valves

Definitions

  • the invention relates to an injection nozzle according to the preamble of Claim 1.
  • the fuel injection device is designed to be pressure-controlled.
  • a pressure-controlled fuel injection device is understood to mean that the fuel pressure prevailing in the nozzle space of an injection nozzle moves a nozzle needle against the action of a closing force (spring), so that the injection opening is released for injection of the fuel from the nozzle space into the cylinder ,
  • injection pressure The pressure at which fuel emerges from the nozzle chamber into a cylinder of an internal combustion engine
  • system pressure is understood to mean the pressure at which fuel is available or is stored within the fuel injection device.
  • Fuel metering means providing a defined amount of fuel for injection.
  • Leakage is to be understood as an amount of fuel that is generated during operation of the fuel injection device (for example, a guide leakage ), is not used for injection and is returned to the fuel tank.
  • the pressure level of this leakage can have a standing pressure, the fuel then being expanded to the pressure level of the fuel tank.
  • an injector is proposed according to claim 1.
  • the use of a single 2/2-way valve as a metering valve per cylinder leads to a cheaper system.
  • the design becomes more compact because Functions such as valve opening and hydraulically assisted opening and Close, to be integrated into the injector. It is a balanced force Construction of the nozzle needle of the vario register nozzle possible.
  • hydraulic assisted opening of the nozzle needle opens the injection nozzle up to one Stroke stop.
  • the stroke stop can be purely hydraulic or be carried out hydraulically / mechanically.
  • the control of the injection nozzle can be either in the direction or in Injection nozzles opening in the opposite direction to the injection chamber are used.
  • the throttles in the control chamber or the control chamber and the piston are only accordingly easy to adapt constructively.
  • the leak oil line When using the leak oil line to control the hydraulic or Hydraulic / mechanical stroke stop can be a hydraulic connection on the Injector is eliminated.
  • the leak oil line is through one or more valves and appropriate throttles or pressure control valves to a higher pressure dammed.
  • a control unit should preferably be in the leak oil line for everyone Cylinders can be used simultaneously.
  • the injection course can be better matched to the Adapt the requirements of the engine.
  • pressure-controlled fuel injection device 1 is a volume-controlled fuel pump 2 fuel 3 from a storage tank 4 via a feed line 5 in a central pressure reservoir 6 (common rail), from which a plurality of the number of individual cylinders corresponding pressure lines 7 to the individual , in the combustion chamber of the internal combustion engine to be supplied, injecting injection nozzles 8 . Only one of the injection nozzles 8 is shown in more detail in FIG. 1. With the help of the fuel pump 2, a system pressure is generated and stored in the pressure storage chamber 6 at a pressure of 300 to approximately 1800 bar.
  • metering valves 9 which are designed as 2/2-way valves.
  • the metering valve 9 is a directly actuated force-balanced solenoid valve. With the aid of the metering valve 9, the injection for each cylinder is realized in a pressure-controlled manner.
  • a pressure line 10 connects the pressure accumulator chamber 6 to a nozzle chamber 11.
  • the injection takes place with the aid of a piston-shaped nozzle needle 12, which is axially displaceable in a guide bore and has a conical valve sealing surface 13 at one end, with which it cooperates with a valve seat surface on the housing of the injection nozzle 8. Injection openings are provided on the valve seat surface of the housing.
  • a pressure surface 14 pointing in the opening direction of the nozzle needle 12 is exposed to the pressure prevailing there, which is supplied to the nozzle space 11 via the pressure line 10.
  • a high-pressure fuel wave runs in the Pressure line 10 to the nozzle chamber 11.
  • the nozzle needle 12 is against one Restoring force is lifted from the valve seat surface and the injection process can kick off.
  • a first pressure relief throttle 15 and a second pressure relief throttle 16 are assigned to the injection nozzle 1.
  • the pressure line 10 has a permanent, continuous connection to a leakage line 17.
  • the pressure line 10 is connected to the leakage line 17 only when the injection opening is closed.
  • the fuel injection device 1 therefore has a further pressure relief throttle 16 which can be closed by a stroke of the nozzle needle 12.
  • the smaller pressure relief throttle 15 leads to less leakage during the injection.
  • the pressure in the nozzle chamber 11 initially drops only via the pressure relief throttle 15 and the nozzle needle 12 begins to close.
  • the pressure relief throttle 16 which is still closed, is released, so that the closing process of the nozzle needle 12 is greatly accelerated.
  • the pressure relief throttle 16 leads to a fuel injector being designed without an unwanted post-injection.
  • An optional further throttle 19 additionally reduces the leakage.
  • FIG. 1 An injection nozzle 21 is moved in a nozzle needle 22 outwardly in the direction 23 of the combustion chamber to the injection to be performed.
  • the closed position is shown in the figures.
  • the known technique of a hydraulic or mechanical stroke stop as is known for example from DE 196 23 211 A1, can be used.
  • the closing process for the injection nozzles 21 and 22 takes place through the hydraulic interaction of the outlet throttle 24 with the pressure relief throttle 25 , with the inlet 26 and with the bore 27 .
  • the movement of the nozzle needle 22 is used.
  • the displacement of the nozzle needle 22 can be controlled via the pressure in the control chamber 28.
  • a pressure increase leads to opening and a pressure reduction to the closing process because the nozzle needle 22 is biased into the closed position by means of a spring 29.
  • the bore 27 is formed, which connects the control chamber 28 connected to the supply line 10 for fuel with a leakage line 30 .
  • the nozzle needle 22 opens the connection of the leakage line 30 to the bore 27 as a result of the lifting movement reduced or interrupted in the direction of 23.
  • the opening stroke is accelerated performed because the pressure in the control chamber 28 increases.
  • the pressure relief of the fuel supply line 10 can also be formed in that the control chamber 28 is always connected to the leakage line 30 via the pressure relief throttle 25 (FIG. 3).
  • FIG. 4 shows that the movement of a nozzle needle 40 of an injection nozzle 41 for opening and closing is determined by the pressure conditions in a control room 42 and a working room 43 .
  • the control chamber 42 is permanently connected to a leakage line 45 via a pressure relief throttle 44 .
  • a plurality of bores 46a, 46b, 46c are formed on a head facing away from the valve seat, via which the working space 43 can be connected differently to the leakage line 45.
  • the bore 46a is connected directly to the leakage line.
  • the bore 46c is connected to the leakage line via an outlet throttle 47 .
  • the bore 46b is connected to the leakage line 45 via a drain control valve 48 .
  • the drain control valve 48 opens at a certain pressure in the leakage line 45.
  • a spring 49 is pressed back via a piston 50 until a bore 51 with the feed line to the bore 46b comes to cover. This results in multi-stage pressure relief of the working space 43.
  • the distances between the bores 46a to 46c and the resulting stroke of the nozzle needle 40 are based on the distances between a plurality of injection openings arranged one above the other analogously to the bores 46a, 46b and 46c at the other end of the nozzle needle 40 (multi-stage spray hole cross-section) so that a different or several injection openings are released in each stage.
  • the opening in the direction of arrow 53 or the closing of the nozzle needle 40 in the opposite direction is accelerated or slowed down, depending on the pressure in the control space 42 or the working space 43 is.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP01123491A 2000-11-03 2001-09-28 Injecteur Withdrawn EP1203882A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10054526 2000-11-03
DE10054526A DE10054526A1 (de) 2000-11-03 2000-11-03 Einspritzdüse

Publications (2)

Publication Number Publication Date
EP1203882A2 true EP1203882A2 (fr) 2002-05-08
EP1203882A3 EP1203882A3 (fr) 2003-12-17

Family

ID=7662037

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01123491A Withdrawn EP1203882A3 (fr) 2000-11-03 2001-09-28 Injecteur

Country Status (4)

Country Link
US (1) US6553967B2 (fr)
EP (1) EP1203882A3 (fr)
JP (1) JP2002147315A (fr)
DE (1) DE10054526A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10123775B4 (de) * 2001-05-16 2005-01-20 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung für Brennkraftmaschinen, insbesondere Common-Rail-Injektor, sowie Kraftstoffsystem und Brennkraftmaschine
EP1541860B1 (fr) * 2003-12-12 2007-07-04 Delphi Technologies, Inc. Injecteur avec soupape de commande pour commander la pression dans une chambre de commande
US6928986B2 (en) * 2003-12-29 2005-08-16 Siemens Diesel Systems Technology Vdo Fuel injector with piezoelectric actuator and method of use
DE102004010760A1 (de) * 2004-03-05 2005-09-22 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen mit Nadelhubdämpfung
DE102006020634B4 (de) * 2006-05-04 2008-12-04 Man Diesel Se Einspritzinjektor für Brennkraftmaschinen
US11298769B2 (en) * 2019-05-13 2022-04-12 International Business Machines Corporation Prevention of dripping of material for material injection

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19623211A1 (de) 1996-06-11 1997-12-18 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2711902A1 (de) * 1977-03-18 1978-09-21 Bosch Gmbh Robert Kraftstoffeinspritzduese
DE3117665C2 (de) * 1981-05-05 1983-10-20 Audi Nsu Auto Union Ag, 7107 Neckarsulm Kraftstoffeinspritzventil für Brennkraftmaschinen
US5230613A (en) * 1990-07-16 1993-07-27 Diesel Technology Company Common rail fuel injection system
US5647536A (en) * 1995-01-23 1997-07-15 Cummins Engine Company, Inc. Injection rate shaping nozzle assembly for a fuel injector
DE19616812B4 (de) * 1995-04-27 2004-09-30 Nippon Soken, Inc., Nishio Kraftstoffeinspritzvorrichtung
DE19727896A1 (de) * 1997-07-01 1999-01-07 Bosch Gmbh Robert Kraftstoffeinspritzventil
AT2961U3 (de) * 1998-07-02 1999-11-25 Avl List Gmbh Speichereinspritzeinrichtung
US6471142B1 (en) * 1999-04-01 2002-10-29 Delphi Technologies, Inc. Fuel injector
DE19938169A1 (de) * 1999-08-16 2001-03-01 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung
DE10065103C1 (de) * 2000-12-28 2002-06-20 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19623211A1 (de) 1996-06-11 1997-12-18 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen

Also Published As

Publication number Publication date
EP1203882A3 (fr) 2003-12-17
JP2002147315A (ja) 2002-05-22
US20020053606A1 (en) 2002-05-09
US6553967B2 (en) 2003-04-29
DE10054526A1 (de) 2002-05-16

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