EP1354133B1 - Kraftstoffeinspritzvorrichtung - Google Patents

Kraftstoffeinspritzvorrichtung Download PDF

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Publication number
EP1354133B1
EP1354133B1 EP01990326A EP01990326A EP1354133B1 EP 1354133 B1 EP1354133 B1 EP 1354133B1 EP 01990326 A EP01990326 A EP 01990326A EP 01990326 A EP01990326 A EP 01990326A EP 1354133 B1 EP1354133 B1 EP 1354133B1
Authority
EP
European Patent Office
Prior art keywords
pressure
fuel
injection
injector
injection device
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
EP01990326A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1354133A2 (de
Inventor
Bernd Mahr
Martin Kropp
Hans-Christoph Magel
Wolfgang Otterbach
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 EP1354133A2 publication Critical patent/EP1354133A2/de
Application granted granted Critical
Publication of EP1354133B1 publication Critical patent/EP1354133B1/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
    • 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
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • 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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails

Definitions

  • the invention relates to a fuel injection device according to the preamble of claim 1
  • Such a fuel injection device is, for example, by the US 5,505,384 become known.
  • the fuel injection device is pressure-controlled.
  • a pressure-controlled fuel injection device is understood to be moved by the pressure prevailing in the nozzle chamber of an injector fuel nozzle needle 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.
  • Fuel metering means to provide a defined amount of fuel for injection.
  • Leakage is understood to mean an amount of fuel that arises during operation of the fuel injection device (eg a pilot leakage or control amount), is not used for injection and is fed back to the fuel tank.
  • the pressure level of this leakage may have a steady state pressure, with the fuel subsequently being expanded to the pressure level of the fuel tank.
  • each injector requires a complex 3/2-way valve or two 2/2-way valves are used.
  • a pressure booster is possible, as he For example, from US 5,143,291 or US 5,522,545 is known.
  • US 5,143,291 or US 5,522,545 is known.
  • Disadvantage of these pressure-boosted systems lies in a lack of flexibility of the Injection and a poor quantity tolerance in the metering smaller Quantities of fuel.
  • the first pressure relief throttle leads to a lower Leakage during the injection.
  • the second pressure relief throttle leads to Acceleration of the closing process.
  • the use of a single 2/2-way valve as a metering valve per cylinder in combination with a pressure booster leads to a more cost effective system. It follows in training of Invention a common rail injection system, with two 2/2-way valves realized both a control of the pressure amplifier and the injector. Both injection concepts allow a very high maximum injection pressure, one Pre-injection at a lower pressure level and the realization of a Boat injection at the main injection.
  • first embodiment of a pressure-controlled fuel injection apparatus 1 conveys a fuel pump fuel from a storage tank via a feed pipe in a in FIGS. not shown central pressure storage space (common rail), from which several, corresponding to the number of individual cylinders discharge pressure lines 2 to the individual, projecting into the combustion chamber of the engine to be supplied injectors 3 .
  • central pressure storage space common rail
  • only one of the injectors 3 is located .
  • 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 and post-injection (HC enrichment for exhaust aftertreatment or soot reduction) and for displaying a course of injection with plateau (boat injection).
  • each injector 3 is assigned a respective local pressure booster 4 .
  • the pressure booster 4 cooperates with a 3/2-way valve 5 for controlling the pressure boost, a check valve 6 and a pressure means 7 in the form of a displaceable piston.
  • the pressure means 7 can be connected at one end by means of the valve 5 to the pressure line 2, so that the pressure medium 7 can be pressurized at one end.
  • a differential space 8 is depressurized by means of a leakage line 9 , so that the pressure medium 7 can be moved to reduce the volume of a pressure chamber 10 .
  • the pressure means 7 is moved in the compression direction, so that the fuel located in the pressure chamber 10 is compressed and a control chamber 11 and a nozzle chamber 12 is supplied.
  • the check valve 6 prevents the return of compressed fuel in the accumulator chamber.
  • a second higher pressure can be generated.
  • the primary chamber 13 is connected by means of the valve 5 to the leakage line 9, then the provision of the pressure medium 7 and the refilling of the pressure chamber 10. Due to the pressure conditions in the pressure chamber 10 and the primary chamber 13 opens the check valve 6, so that the pressure chamber 10th under rail pressure (pressure of the pressure accumulator space) is and the pressure fluid 7 is returned hydraulically to its original position.
  • one or more springs may be arranged in the spaces 8, 10 or 13. By means of the pressure boost, a second system pressure can thus be generated.
  • the injector 3 has a first pressure relief throttle 17 and a second pressure relief throttle 18 .
  • the pressure line 19 has a permanent continuous connection to the leakage line 20.
  • the pressure line 19 is connected to the leakage line 20 only when the injection port is closed.
  • the injector 3 therefore has the further pressure-relief throttle 18, which can be closed by a stroke of the nozzle needle 16.
  • the smaller pressure relief throttle 17 results in less leakage during injection.
  • FIG. 2 shows a further embodiment (fuel injection device 21 ) in which, in addition to the control of the pressure booster 4, a 2/2-way valve 22 is also used.
  • the valve 22 In the unswitched state, the valve 22 has no flow. It is the rail pressure from the accumulator chamber for metering to valve 14.
  • the pressure booster 4 has returned to its starting position. If the Veritil 22 is switched to flow, then the pressure booster 4 causes an increase in the rail pressure. This increased pressure is now at the metering valve 14.
  • Both 2/2-way valves can be switched with an actuator, as shown in Fig. 3 (fuel injector 23 ).
  • the actuator solenoid actuator or piezo actuator
  • the actuator is connected to both valves and has a 3-stage design, ie one idle and two switch positions. The two switching positions are controlled with different control voltages. At rest, both valves have no flow. In the first switching position, only the valve 24 is switched to flow and thus generates an injection with rail pressure. In the second switching position, the valve 24 and the valve 25 are switched to flow and there is an injection with the increased pressure by the pressure booster 4. If the first switching position is initially realized and after a certain delay during injection, the second switching position is formed, the result is a boot injection.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP01990326A 2001-01-13 2001-12-19 Kraftstoffeinspritzvorrichtung Expired - Lifetime EP1354133B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10101358 2001-01-13
DE10101358A DE10101358A1 (de) 2001-01-13 2001-01-13 Kraftstoffeinspritzeinrichtung
PCT/DE2001/004798 WO2002055871A2 (de) 2001-01-13 2001-12-19 Kraftstoffeinspritzeinrichtung

Publications (2)

Publication Number Publication Date
EP1354133A2 EP1354133A2 (de) 2003-10-22
EP1354133B1 true EP1354133B1 (de) 2005-11-16

Family

ID=7670463

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01990326A Expired - Lifetime EP1354133B1 (de) 2001-01-13 2001-12-19 Kraftstoffeinspritzvorrichtung

Country Status (5)

Country Link
US (1) US20040003794A1 (ja)
EP (1) EP1354133B1 (ja)
JP (1) JP2004517259A (ja)
DE (2) DE10101358A1 (ja)
WO (1) WO2002055871A2 (ja)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001323858A (ja) * 2000-05-17 2001-11-22 Bosch Automotive Systems Corp 燃料噴射装置
JP4003770B2 (ja) * 2004-10-01 2007-11-07 トヨタ自動車株式会社 燃料噴射装置
US7293547B2 (en) * 2005-10-03 2007-11-13 Caterpillar Inc. Fuel injection system including a flow control valve separate from a fuel injector
DE102005060552B4 (de) * 2005-12-17 2009-06-10 Man Diesel Se Einspritzvorrichtung für Brennstoffmotoren
US7578283B1 (en) 2008-06-30 2009-08-25 Caterpillar Inc. System for selectively increasing fuel pressure in a fuel injection system
US20150216205A1 (en) * 2012-08-31 2015-08-06 Unicharm Corporation ` Pet food
US10865728B2 (en) * 2019-01-18 2020-12-15 Pratt & Whitney Canada Corp. Method of using backflow from common-rail fuel injector
US10738749B1 (en) 2019-01-18 2020-08-11 Pratt & Whitney Canada Corp. Method of using heat from fuel of common-rail injectors

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19629107A1 (de) * 1996-07-19 1998-01-29 Mtu Friedrichshafen Gmbh Vorrichtung zum Einspritzen von Kraftstoff und einem Zusatzfluid in den Brennraum eines Dieselmotors

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57124073A (en) * 1981-01-24 1982-08-02 Diesel Kiki Co Ltd Fuel injection device
US5143291A (en) 1992-03-16 1992-09-01 Navistar International Transportation Corp. Two-stage hydraulic electrically-controlled unit injector
US5722373A (en) * 1993-02-26 1998-03-03 Paul; Marius A. Fuel injector system with feed-back control
US5505384A (en) * 1994-06-28 1996-04-09 Caterpillar Inc. Rate shaping control valve for fuel injection nozzle
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
US5522545A (en) 1995-01-25 1996-06-04 Caterpillar Inc. Hydraulically actuated fuel injector
US5862792A (en) * 1996-02-28 1999-01-26 Paul; Marius A. Self-injection system
US5685272A (en) * 1996-02-28 1997-11-11 Paul; Marius A. Self injection system
DE19742320A1 (de) * 1997-09-25 1999-04-01 Bosch Gmbh Robert Kraftstoffeinspritzventil
US5931139A (en) * 1997-10-14 1999-08-03 Caterpillar Inc. Mechanically-enabled hydraulically-actuated electronically-controlled fuel injection system
JP4574762B2 (ja) * 1998-08-28 2010-11-04 ヴェルトジィレ シュヴァイツ アクチェンゲゼルシャフト 往復ピストンエンジンの燃料噴射装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19629107A1 (de) * 1996-07-19 1998-01-29 Mtu Friedrichshafen Gmbh Vorrichtung zum Einspritzen von Kraftstoff und einem Zusatzfluid in den Brennraum eines Dieselmotors

Also Published As

Publication number Publication date
DE10101358A1 (de) 2002-07-25
US20040003794A1 (en) 2004-01-08
EP1354133A2 (de) 2003-10-22
WO2002055871A2 (de) 2002-07-18
JP2004517259A (ja) 2004-06-10
WO2002055871A3 (de) 2002-09-19
DE50108115D1 (de) 2005-12-22

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