EP1185784B1 - Druckübersetzer für ein kraftstoffeinspritzsystem für brennkraftmaschinen - Google Patents

Druckübersetzer für ein kraftstoffeinspritzsystem für brennkraftmaschinen Download PDF

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Publication number
EP1185784B1
EP1185784B1 EP00979422A EP00979422A EP1185784B1 EP 1185784 B1 EP1185784 B1 EP 1185784B1 EP 00979422 A EP00979422 A EP 00979422A EP 00979422 A EP00979422 A EP 00979422A EP 1185784 B1 EP1185784 B1 EP 1185784B1
Authority
EP
European Patent Office
Prior art keywords
pressure
space
control
stepped piston
oil return
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
EP00979422A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1185784A2 (de
Inventor
Friedrich Boecking
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 EP1185784A2 publication Critical patent/EP1185784A2/de
Application granted granted Critical
Publication of EP1185784B1 publication Critical patent/EP1185784B1/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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/304—Fuel-injection apparatus having mechanical parts, the movement of which is damped using hydraulic means

Definitions

  • the invention relates to a pressure intensifier for a Fuel injection system for internal combustion engines according to the Preamble of claim 1.
  • EP 0879 954 A2 describes a pressure intensifier for a Fuel injection system known in which after the completion of a First injection into a second pressure chamber from the fuel an injector is pumped, is completely emptied. The second pressure chamber is then filled again. The beginning The filling of the second pressure chamber is placed so that the volume of the second pressure chamber of the fuel quantity to be injected on Start of injection of the next injection has been reached. I.e. the Metering a certain injection quantity is with several Inaccurate. The end of the injection is reached if a pressure relief bore in the stepped piston coincides with a low pressure connection in the control valve housing. This means that the termination of the injection is not sudden, but takes place relatively gently. So are both beginning and End of an injection with certain inaccuracies.
  • the invention is based on the object Provide fuel injection system in which the on the Pressure intensifiers acting hydraulic forces are reduced and where the pressure intensifier can be controlled easily and precisely.
  • higher injection pressures should be possible and at the same time the load and the drive power requirement of the injection pump be reduced.
  • This pressure translator which is very simply constructed according to the invention, has the advantage that between the injections on the Step piston acting pressure forces are reduced so that the Step piston after the end of the injection after the end of the Injection regardless of the prevailing pressures with a small actuating force in its starting position on the pump side can be brought back.
  • the return spring required for this requires little installation space.
  • the pressure intensifier according to the invention can despite its simple Structure can be controlled very precisely because the stepped piston is too Start of each injection at a defined point, namely the pump-side stop.
  • the injection is also made very precisely by the pressure intensifier Closing of the control valve ended because immediately after the Closing the control valve the pressure in the second pressure chamber suddenly collapses
  • the injection quantity can be measured very precisely be what is beneficial to the operational behavior as well Emissions and fuel consumption of the internal combustion engine effect.
  • the leakage and Throttle losses in the fuel injection system resulting in a Reduction of the drive power requirement leads and the hydraulic Improved fuel injection system efficiency.
  • the high injection pressures enable smaller spray hole diameters the injector, which causes the mixture formation in all operating points improved.
  • first end face and the ring face are essentially the same size are so that the hydraulic forces on the stepped piston between the injections are fully balanced.
  • control room has a Inlet throttle hydraulically connected to the first pressure chamber stands so that a pressure equalization between first pressure chamber and control room is prevented.
  • control chamber can be depressurized via a control valve, in particular a 2/2 control valve, so that the start of delivery of the pressure booster can be controlled by opening the control valve.
  • the heel is detachable with connected to the stepped piston, so that manufacture and assembly be simplified.
  • Another variant of the invention provides that the second Pressure chamber is filled from the leak oil return, and that between a check valve is arranged in the second pressure chamber and leakage oil return is that the return flow of fuel from the second pressure chamber to Leak oil return locks, so that the filling is easy and between injections only a low pressure in the second Pressure room prevails.
  • the pressure in Leakage oil return is lower than the opening pressure of the injection nozzle, so the injector is safe between injections closes.
  • the stepped piston is Simplification of manufacture and assembly carried out in two parts.
  • An embodiment of the invention provides that the tax amount of Control valve is discharged into the drain oil return, so that a simple hydraulic circuit is achieved.
  • control piston in a sleeve is guided so that the guide of the stepped piston is improved.
  • FIG. 1 schematically shows a fuel injection system with an injector 1 and an injection pump 3, the one High pressure part 5 has.
  • the high pressure part 5 is over a control line 9 and a high pressure path 10 with the Injector 1 in operative connection.
  • a Pressure intensifier arranged between the Control line 9 and the high pressure path 10 .
  • the pressure intensifier 11 has in a housing 12 a first pressure chamber 13, a second pressure chamber 15, a one- or multi-part stepped piston 17, which in a Bore 18 is guided, and a control room 19.
  • the first pressure chamber 13 and the end face of the stepped piston 17 with the diameter d 1 projecting into the first pressure chamber 13 form the low-pressure side of the pressure booster 11.
  • the second pressure chamber 15 and the end face of the stepped piston 17 with the diameter d projecting into the second pressure chamber 15 3 form the high pressure side of the pressure intensifier 11.
  • the control chamber 19 is an annular surface 20 of the Step piston 17 and a paragraph in the housing 12 of the Pressure intensifier 11 limited in the longitudinal direction.
  • a 2/2-way control valve 21 connected to the control chamber 19 is closed between the injections.
  • First pressure chamber 13 and control chamber 19 are connected by a connecting line 23, which has an inlet throttle 25, so that when control valve 21 is closed, the same pressure prevails in rooms 13 and 19.
  • a slight overcompensation of the hydraulic force acting on the end face of the stepped piston 17 can be advantageous.
  • the injection is triggered by the control valve 21 is opened.
  • the one located in the control room 19 Fuel flows through the control valve 21 into one Leak oil return 27.
  • the inlet throttle 25 causes at open control valve 21 the pressure in the control chamber 19 under that of the first pressure chamber 13 drops. As a result, the Force balance between that in the first pressure chamber 13 projecting end face of the stepped piston 17 and the Annular surface 20 no longer exist.
  • the stepped piston 17 begins to promote.
  • the second pressure chamber 15 is with a leakage oil pressure acted upon supply line 31 filled.
  • a check valve 33 arranged in this Supply line 31 .
  • the check valve 27 can be spring-loaded, such as shown in Fig. 2, or without a spring and prevents the backflow of fuel during the Injection.
  • the leakage oil pressure is below the Injector opening pressure 1.
  • the stepped piston 17 is guided with its diameter d 1 of a sleeve 35th
  • the sleeve 35 is fixed radially in the housing 12.
  • a shoulder 37 of the housing 12 and a plate spring 39 ensure the fixing of the sleeve 35.
  • the housing 12 can be divided along the shoulder 37 in order to facilitate the manufacture and assembly of the pressure intensifier 11 according to the invention.
  • the plate spring 39 prevents the stepped piston 17 from sitting “hard” on its pump-side stop.
  • the return spring 29 is between the sleeve 35 and one Paragraph 41 of the stepped piston 17 clamped. 2 is an embodiment shown in which the paragraph 41 in the stepped piston 17 is screwed in. However, there are also other embodiments are conceivable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP00979422A 1999-10-15 2000-10-12 Druckübersetzer für ein kraftstoffeinspritzsystem für brennkraftmaschinen Expired - Lifetime EP1185784B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19949848A DE19949848A1 (de) 1999-10-15 1999-10-15 Druckübersetzer für ein Kraftstoffeinspritzsystem für Brennkraftmaschinen
DE19949848 1999-10-15
PCT/DE2000/003594 WO2001029396A2 (de) 1999-10-15 2000-10-12 Druckübersetzer für ein kraftstoffeinspritzsystem für brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP1185784A2 EP1185784A2 (de) 2002-03-13
EP1185784B1 true EP1185784B1 (de) 2003-10-08

Family

ID=7925825

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00979422A Expired - Lifetime EP1185784B1 (de) 1999-10-15 2000-10-12 Druckübersetzer für ein kraftstoffeinspritzsystem für brennkraftmaschinen

Country Status (8)

Country Link
US (1) US6427664B1 (ko)
EP (1) EP1185784B1 (ko)
JP (1) JP2003512574A (ko)
KR (1) KR20010093156A (ko)
BR (1) BR0007458A (ko)
CZ (1) CZ295572B6 (ko)
DE (2) DE19949848A1 (ko)
WO (1) WO2001029396A2 (ko)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19946833C2 (de) * 1999-09-30 2002-02-21 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten
DE10019764B4 (de) * 2000-04-20 2004-09-23 Robert Bosch Gmbh Ventil zum Steuern von Flüssigkeiten
DE10019765B4 (de) * 2000-04-20 2004-12-09 Robert Bosch Gmbh Ventil zum Steuern von Flüssigkeiten
DE10126685A1 (de) * 2001-06-01 2002-12-19 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung mit Druckverstärker
DE10315016A1 (de) 2003-04-02 2004-10-28 Robert Bosch Gmbh Kraftstoffinjektor mit leckagefreiem Servoventil
US7320310B2 (en) 2003-04-02 2008-01-22 Robert Bosch Gmbh Fuel injector provided with provided with a pressure transmitter controlled by a servo valve
DE10355041A1 (de) * 2003-11-25 2005-06-23 Robert Bosch Gmbh Druckübersetzer mit Führungseinsatz für einen Kraftstoffinjektor
JP3994990B2 (ja) 2004-07-21 2007-10-24 株式会社豊田中央研究所 燃料噴射装置
DE102004051757A1 (de) * 2004-10-23 2006-04-27 Robert Bosch Gmbh Kraftstoffinjektor mit hydraulisch betätigbarem Druckübersetzer
JP4459183B2 (ja) * 2006-03-16 2010-04-28 株式会社デンソー インジェクタ
JP4609351B2 (ja) * 2006-03-17 2011-01-12 株式会社デンソー インジェクタ
JP2007255328A (ja) * 2006-03-23 2007-10-04 Toyota Motor Corp 噴射燃料増圧装置
JP6583304B2 (ja) * 2017-02-17 2019-10-02 トヨタ自動車株式会社 内燃機関の制御装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3102697A1 (de) * 1980-12-20 1982-10-21 Volkswagenwerk Ag, 3180 Wolfsburg Kraftstoffeinspritzeinrichtung
JP2885076B2 (ja) * 1994-07-08 1999-04-19 三菱自動車工業株式会社 蓄圧式燃料噴射装置
US5641121A (en) * 1995-06-21 1997-06-24 Servojet Products International Conversion of non-accumulator-type hydraulic electronic unit injector to accumulator-type hydraulic electronic unit injector
DE19531870C2 (de) * 1995-08-30 2002-07-18 Bosch Gmbh Robert Kraftstoffeinspritzsystem
DE19701879A1 (de) * 1997-01-21 1998-07-23 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen
US5878720A (en) * 1997-02-26 1999-03-09 Caterpillar Inc. Hydraulically actuated fuel injector with proportional control
US5852997A (en) * 1997-05-20 1998-12-29 Stanadyne Automotive Corp. Common rail injector
DE19738804B4 (de) * 1997-09-05 2004-07-22 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen

Also Published As

Publication number Publication date
WO2001029396A2 (de) 2001-04-26
CZ20012115A3 (cs) 2002-06-12
KR20010093156A (ko) 2001-10-27
WO2001029396A3 (de) 2001-12-27
CZ295572B6 (cs) 2005-08-17
JP2003512574A (ja) 2003-04-02
BR0007458A (pt) 2001-10-16
EP1185784A2 (de) 2002-03-13
DE50004006D1 (de) 2003-11-13
DE19949848A1 (de) 2001-04-19
US6427664B1 (en) 2002-08-06

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