EP1397593B1 - Kraftstoffeinspritzeinrichtung mit druckverstärker - Google Patents

Kraftstoffeinspritzeinrichtung mit druckverstärker Download PDF

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Publication number
EP1397593B1
EP1397593B1 EP02742762A EP02742762A EP1397593B1 EP 1397593 B1 EP1397593 B1 EP 1397593B1 EP 02742762 A EP02742762 A EP 02742762A EP 02742762 A EP02742762 A EP 02742762A EP 1397593 B1 EP1397593 B1 EP 1397593B1
Authority
EP
European Patent Office
Prior art keywords
pressure
piston
fuel
injection device
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.)
Expired - Lifetime
Application number
EP02742762A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1397593A1 (de
Inventor
Wolfgang Braun
Bernd Mahr
Martin Kropp
Hans-Christoph Magel
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 EP1397593A1 publication Critical patent/EP1397593A1/de
Application granted granted Critical
Publication of EP1397593B1 publication Critical patent/EP1397593B1/de
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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
    • F02M57/026—Construction details of pressure amplifiers, e.g. fuel passages or check valves arranged in the intensifier piston or head, particular diameter relationships, stop members, arrangement of ports or conduits
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from injectors
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/105—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive hydraulic drive
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment

Definitions

  • the invention relates to a fuel injection device according to the preamble of claim 1.
  • the fuel injection device according to the invention may be formed both stroke-controlled and pressure-controlled.
  • a stroke-controlled fuel injection device is understood to mean that the opening and closing of the injection opening takes place by means of a displaceable nozzle needle due to the hydraulic interaction of the fuel pressures in a nozzle chamber and in a control chamber. A pressure reduction within the control chamber causes a stroke of the nozzle needle. Alternatively, the deflection of the nozzle needle by an actuator (actuator, actuator) take place.
  • a pressure-controlled fuel injection device In a pressure-controlled fuel injection device according to the invention, the nozzle needle is moved by the pressure prevailing in the nozzle chamber of an injector fuel pressure against the action of a closing force (spring), so that the injection port for injection of the fuel from the nozzle chamber is released into the cylinder.
  • injection pressure The pressure with which fuel exits the nozzle chamber into a cylinder of an internal combustion engine
  • system pressure is understood to mean the pressure below which fuel is available or stored in the fuel injector.
  • a fuel injection device with a pressure booster wherein the stroke of a piston of the pressure booster can be controlled substantially by the pressure in a differential space of the pressure booster.
  • means for cross-section control of a flow cross-section from the differential space are provided, which are formed by controllable valve devices.
  • a leakage line is opened and closed in a controlled manner by means of the valve device.
  • a fuel injection device with the features of claim 1 is proposed. If, for example, two outlet cross-sections (one larger and one smaller) are released successively from the differential space of the pressure intensifier as a function of the piston stroke of the pressure intensifier, a so-called boat injection can be carried out.
  • the first embodiment of a stroke-controlled fuel injection device 1 promotes a fuel quantity controlled fuel from a storage tank via a delivery line in a central pressure storage space (common rail), of which several, the number of individual cylinders corresponding pressure lines 2 to the individual, in the combustion chamber of the engine to be supplied protruding injectors 3 (injector) dissipate.
  • a first system pressure is generated and stored in the pressure storage space. This first system pressure is used for pre-injection and, if necessary, for post-injection (HC enrichment for exhaust gas aftertreatment or soot reduction) and for displaying an injection profile with plateau (boat injection).
  • each injector 3 is assigned a respective local pressure booster 4 with a check valve 5 and with a displaceable piston 6 .
  • Such fuel injectors are for example from the DE-A1-19910970 known.
  • the pressure is used in the formed by a transition from a larger to a smaller piston cross-section space 7 .
  • the differential space 7 is acted upon by a supply pressure (rail pressure). Then prevail at all pressure surfaces of a piston 6, the same pressure conditions (rail pressure).
  • the piston 6 is pressure balanced.
  • the piston 6 is pressed into its starting position.
  • the differential space 7 is relieved of pressure and the pressure booster 4 generates a pressure boost according to the area ratio.
  • a throttle 11 and a simple 2/2-way valve 12 can be used instead of a complex 3/2-way valve.
  • the throttle 11 connects the differential space 7 with standing under supply pressure fuel from an accumulator chamber.
  • the 2/2-way valve 12 connects the differential space 7 to a leakage line 13.
  • the throttle 11 should be designed as small as possible, but still so large that the piston 6 returns to its original position between the injection cycles. As a throttle and a pilot leakage of the piston 6 can be used.
  • the throttle can also be integrated in the piston.
  • the injector 3 is under the pressure of the pressure storage chamber.
  • the pressure booster 4 is in the starting position. Now can be done by the valve 14 an injection with rail pressure. If an injection with a higher pressure is desired, then the 2/2-way valve 12 is activated (opened) and thus reaches a pressure boost.
  • the injection takes place via a fuel metering with the aid of a guide needle axially displaceable nozzle needle 15 with a conical valve sealing surface at one end, with which it has a valve seat surface on the injector of the injector. 3 interacts.
  • a pressure surface pointing in the opening direction of the nozzle needle 15 is exposed to the pressure prevailing there, which pressure is supplied to the nozzle chamber 16 via a pressure line.
  • Coaxial with a valve spring 17 also engages on the nozzle needle 15 to a pressure piece 18, which limits the control chamber 19 with its end facing away from the valve sealing face.
  • the control room 19 has from Fuel pressure port forth an inlet with a first throttle and a flow to a pressure relief line 20 with a second throttle, which is controlled by the 2/2-way valve 14.
  • the end of the injection is initiated by renewed actuation (closing) of the 2/2-way valve 14, which decouples the control chamber 19 again from the leakage line 20, so that pressure builds up again in the control chamber 19, the pressure piece 18 in the closing direction can move.
  • a continuous cross-sectional enlargement can also be achieved be formed ( Figures 2 and 3 ). It can be achieved a uniform, flat pressure increase without disturbing pressure oscillations. 2, only a partial area 25 of a slot-shaped opening 26 is released up to a control edge by the direction of movement 23 of a piston 24 (longitudinal direction of the opening and the piston) depending on the position of the piston 24 and a partial surface 27 of the opening 26 covered.
  • the opening 26 in the wall surface of the differential space establishes the connection of the differential space 7 (see FIG. 1) to the leakage line (see FIG. 1) and can be closed by the piston. With increasing piston stroke, a larger discharge cross section is released. According to FIG.
  • a slot-shaped opening 28 in the wall surface of a pressure booster chamber has a variable cross-sectional area in the direction of movement 29 of the piston 30 .
  • the piston 30 itself has a recess 31 , which produces the continuous connection of the differential space 7 (see FIG. 1) to the leakage line.
  • the recess 31 forms a kind of control window, which slides along the slot 28.
  • the flow cross-section can be varied as desired via the stroke profile of the piston.
  • the slot-shaped opening 28 may also be formed in the piston and the control edge or a recess 31 in the wall surface.

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)
EP02742762A 2001-06-01 2002-05-17 Kraftstoffeinspritzeinrichtung mit druckverstärker Expired - Lifetime EP1397593B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10126686A DE10126686A1 (de) 2001-06-01 2001-06-01 Kraftstoffeinspritzeinrichtung mit Druckverstärker
DE10126686 2001-06-01
PCT/DE2002/001792 WO2002099270A1 (de) 2001-06-01 2002-05-17 Kraftstoffeinspritzeinrichtung mit druckverstärker

Publications (2)

Publication Number Publication Date
EP1397593A1 EP1397593A1 (de) 2004-03-17
EP1397593B1 true EP1397593B1 (de) 2007-08-15

Family

ID=7686869

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02742762A Expired - Lifetime EP1397593B1 (de) 2001-06-01 2002-05-17 Kraftstoffeinspritzeinrichtung mit druckverstärker

Country Status (5)

Country Link
US (1) US6938610B2 (ja)
EP (1) EP1397593B1 (ja)
JP (1) JP4126011B2 (ja)
DE (2) DE10126686A1 (ja)
WO (1) WO2002099270A1 (ja)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10229412A1 (de) * 2002-06-29 2004-01-29 Robert Bosch Gmbh Kraftstoffinjektor mit Druckübersetzer für Mehrfacheinspritzung
DE10249523C5 (de) * 2002-10-23 2015-12-24 Minibooster Hydraulics A/S Druckverstärker
DE10251932B4 (de) * 2002-11-08 2007-07-12 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung mit integriertem Druckverstärker
JP4196869B2 (ja) * 2004-03-31 2008-12-17 三菱ふそうトラック・バス株式会社 燃料噴射装置
JP4075894B2 (ja) * 2004-09-24 2008-04-16 トヨタ自動車株式会社 燃料噴射装置
JP2006132467A (ja) * 2004-11-08 2006-05-25 Mitsubishi Fuso Truck & Bus Corp コモンレール式燃料噴射装置
JP2007255328A (ja) * 2006-03-23 2007-10-04 Toyota Motor Corp 噴射燃料増圧装置
DE102007002761A1 (de) * 2007-01-18 2008-07-24 Robert Bosch Gmbh Kraftstoffinjektor mit integriertem Druckverstärker
DE102010039051A1 (de) 2010-08-09 2012-02-09 Robert Bosch Gmbh Einspritzvorrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2803049A1 (de) * 1978-01-25 1979-08-09 Bosch Gmbh Robert Pumpe-duese fuer brennkraftmaschinen
DE4004610A1 (de) * 1989-04-21 1990-10-25 Bosch Gmbh Robert Kraftstoffeinspritzanlage, insbesondere pumpeduese, fuer brennkraftmaschinen
EP0879954A2 (en) * 1997-05-20 1998-11-25 Stanadyne Automotive Corp. Common rail injector
WO2001052916A2 (de) * 2000-01-20 2001-07-26 Robert Bosch Gmbh Einspritzeinrichtung und verfahren zum einspritzen von fluid

Family Cites Families (16)

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JPS5754620B2 (ja) * 1973-08-29 1982-11-19
GB2150643B (en) 1983-12-02 1987-06-17 Cummins Engine Co Inc Unit fuel injector having independently controlled timing and metering
CH671073A5 (ja) * 1986-09-09 1989-07-31 Nova Werke Ag
JP2615108B2 (ja) 1987-12-25 1997-05-28 株式会社古川製作所 ロータリー式の袋口結束装置
DE3843162A1 (de) * 1988-12-22 1990-06-28 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
US5492098A (en) * 1993-03-01 1996-02-20 Caterpillar Inc. Flexible injection rate shaping device for a hydraulically-actuated fuel injection system
US5459611A (en) 1993-08-18 1995-10-17 Hewlett-Packard Company Beam splitter/combiner with path length compensator and method for making the same
US5517972A (en) * 1994-11-23 1996-05-21 Caterpillar Inc. Method and apparatus for rate shaping injection in a hydraulically-actuated electronically controlled fuel injector
US5954029A (en) * 1995-01-25 1999-09-21 Cummins Engine Company, Inc. Unit fuel injector having constant start of injection
JP3477334B2 (ja) 1996-11-29 2003-12-10 三菱重工業株式会社 燃料噴射ポンプ及びこれを用いたユニットインジェクタ
US5730104A (en) * 1997-02-19 1998-03-24 Caterpillar Inc. Injection rate shaping device for a fill metered hydraulically-actuated fuel injection system
US5868317A (en) * 1997-08-22 1999-02-09 Caterpillar Inc. Stepped rate shaping fuel injector
BR9911127A (pt) * 1998-09-10 2001-02-20 Int Truck & Engine Corp Injetor de combustìvel
DE19910970A1 (de) * 1999-03-12 2000-09-28 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung
DE19916657A1 (de) * 1999-04-14 2000-10-19 Hydraulik Ring Gmbh Einspritzvorrichtung für Verbrennungsmaschinen, vorzugsweise Dieselmotoren
DE19945785B4 (de) * 1999-09-24 2010-10-07 Robert Bosch Gmbh Kraftstoffeinspritzsystem für Brennkraftmaschinen und Verfahren zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2803049A1 (de) * 1978-01-25 1979-08-09 Bosch Gmbh Robert Pumpe-duese fuer brennkraftmaschinen
DE4004610A1 (de) * 1989-04-21 1990-10-25 Bosch Gmbh Robert Kraftstoffeinspritzanlage, insbesondere pumpeduese, fuer brennkraftmaschinen
EP0879954A2 (en) * 1997-05-20 1998-11-25 Stanadyne Automotive Corp. Common rail injector
WO2001052916A2 (de) * 2000-01-20 2001-07-26 Robert Bosch Gmbh Einspritzeinrichtung und verfahren zum einspritzen von fluid

Also Published As

Publication number Publication date
JP2004521242A (ja) 2004-07-15
DE10126686A1 (de) 2002-12-19
EP1397593A1 (de) 2004-03-17
WO2002099270A1 (de) 2002-12-12
JP4126011B2 (ja) 2008-07-30
US20040089269A1 (en) 2004-05-13
US6938610B2 (en) 2005-09-06
DE50210713D1 (de) 2007-09-27

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