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EP0385398A2 - Elektromagnetischer Kraftstoffinjektor eines Dieselmotors - Google Patents

Elektromagnetischer Kraftstoffinjektor eines Dieselmotors Download PDF

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Publication number
EP0385398A2
EP0385398A2 EP90103803A EP90103803A EP0385398A2 EP 0385398 A2 EP0385398 A2 EP 0385398A2 EP 90103803 A EP90103803 A EP 90103803A EP 90103803 A EP90103803 A EP 90103803A EP 0385398 A2 EP0385398 A2 EP 0385398A2
Authority
EP
European Patent Office
Prior art keywords
fuel
injection
chamber
orifice
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.)
Withdrawn
Application number
EP90103803A
Other languages
English (en)
French (fr)
Other versions
EP0385398A3 (de
Inventor
Vincenzo Damiani
Mario Ricco
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.)
Weber SRL
Original Assignee
Weber SRL
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 Weber SRL filed Critical Weber SRL
Publication of EP0385398A2 publication Critical patent/EP0385398A2/de
Publication of EP0385398A3 publication Critical patent/EP0385398A3/de
Withdrawn legal-status Critical Current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
    • 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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the present invention relates to a perfected electromagnetic fuel injector for Diesel engine application.
  • Injectors of the aforementioned type usually comprise a plunger for controlling fuel passage between an injection chamber, supplied with fuel under pressure, and at least an injection orifice formed on the injection nozzle; and an electromagnetic fuel metering valve for controlling fuel passage through a drain orifice between a control chamber, supplied with fuel under pressure, and a low-pressure chamber, for reducing the pressure of the fuel in the control chamber by draining the same through said orifice.
  • the injection and control chambers are partially defined by appropriate surface portions of the plunger, so that the respective pressures inside said chambers and acting on said surface portions displace the plunger when the pressure inside the control chamber falls to a given value.
  • control chamber On injectors of the aforementioned type, the control chamber is normally connected to a fuel supply orifice communicating with a single fitting in turn connected to a supply pipe.
  • injection chamber is supplied via a duct branching from the supply orifice and formed inside the injector.
  • control chamber is likewise connected to a fuel supply orifice communicating with a first fitting in turn connected to a pressurized fuel supply pipe, but, unlike the previous type, fuel is supplied to the injection chamber via a duct communicating with a second fitting in turn connected to a fuel supply pipe.
  • the aim of the present invention is to provide a perfected fuel injector of the aforementioned type designed to overcome the above drawbacks.
  • a Diesel engine electromagnetic fuel injector comprising an axially-sliding plunger for controlling fuel passage between an injection chamber, supplied with fuel under pressure, and at least an injection orifice formed in an injection nozzle, said injection chamber being defined at least partially by a cylindrical surface coaxial with said plunger; characterised by the fact that said plunger comprises a cylindrical portion located inside and slightly smaller in diameter than said surface, so as to define, downstream from said cylindrical portion, an injection chamber portion of predetermined volume; the diameter and length of said cylindrical portion being so selected as to define, between said cylindrical portion and said cylindrical surface, an annular channel enabling fuel passage to said injection chamber portion and along which a predetermined fall in fuel pressure is achieved.
  • the injector illustrated in Fig.1 and perfected according to the present invention is of the type described in Patent Application n.67134-A/89 filed by the present Applicant on 28 February 1989 and entitled: "Diesel engine electromagnetic fuel injector.”
  • Said injector substantially comprises a body 1 in which are formed an axial hole 2, an axial hole 3 considerably smaller in diameter than hole 2, and a supply orifice 4 substantially perpendicular to holes 2 and 3.
  • Said hole 2 houses three sleeves 5, 6 and 7 inside which slides a plunger 8, the bottom end of which is designed to control the passage of pressurized fuel through injection orifices 9 formed in an injection nozzle 10 secured to body 1.
  • the top portion 8a of plunger 8 slides inside sleeve 5, whereas, between plunger 8 and the inner surfaces of sleeves 6 and 7 and the inner surface 12 of nozzle 10, there is defined an annular compartment 13 located upstream from injection orifices 9 and thus defining the injection chamber of the injector.
  • a helical spring 16 located between sleeve 5 and an annular projection 17 on plunger 8, provides for normally securing the bottom end of plunger 8 against a seat on nozzle 10.
  • Said hole 3 defines the control chamber of the injector, which communicates with a low-pressure chamber (not shown) via a drain orifice 15 controlled by an electromagnetic metering valve 18. Activation of valve 18 opens drain orifice 15 for reducing the pressure inside control chamber 3. Appropriate surface portions of plunger 8 are exposed to the fuel inside injection chamber 13 and control chamber 3, so that, when the pressure inside control chamber 3 falls to a given value, plunger 8 is raised for enabling fuel injection through orifices 9.
  • the injector according to the present invention presents a single fitting 19 connected to a pressurized fuel supply pipe (not shown) and communicating directly with control chamber 3 via a supply orifice 4. From supply orifice 4, pressurized fuel is supplied to injection chamber 13 along a duct comprising an annular cavity 23, a groove 20, an annular chamber 21 and radial holes 22.
  • plunger 8 comprises a cylindrical portion 25 (Fig.s 1, 2 and 3) located inside and smaller in diameter than cylindrical surface 12 of nozzle 10, so as to define, downstream from said cylindrical portion, a substantially annular injection chamber portion 26.
  • the volume of said chamber is specially selected for the purposes indicated later on.
  • the diameter and length of said cylindrical portion are so selected as to define, between said cylindrical portion and cylindrical surface 12, an annular channel 27 (Fig.2) enabling fuel passage to injection chamber portion 26 and along which a predetermined fall in fuel pressure is achieved.
  • the injector in the Fig.3 embodiment substantially differs from the previous type by the fact that pressurized fuel is supplied to control chamber 3 along at least one duct 28 located to one side of plunger 8 and supplied via a fitting (not shown) in turn connected to a fuel supply pipe.
  • the Fig.3 injector thus presents two fittings (not shown), one supplying fuel to control chamber 3, and the other to supply ducts 28 to injection chamber 13.
  • metering valve 18 When metering valve 18 is activated, an appropriate amount of pressurized fuel is drained from control chamber 8 into a low-pressure chamber (not shown) through drain orifice 15, thus reducing the pressure inside control chamber 8. The resultant of the pressures applied on plunger 8 thus raises the latter, detaching the bottom end of plunger 8 from the seat on nozzle 10, and so enabling fuel supply through injection orifices 9.
  • injection chamber 13 is obviously divided into two parts, one upstream and another 26 downstream from portion 25.
  • the volume of said injection chamber portion may be so selected that the amount of fuel supplied through orifices 9 at each injection cycle increases gradually. Such an improvement has been found to provide for greater efficiency, reduced noise level and improved combustion of the engine.
  • the fuel in injection chamber portion 26 is sufficiently separated from that in the top part of injection chamber 13 to isolate a specific volume of fuel inside said chamber portion 26, while at the same time still being able to flow along channel 27 into injection chamber portion 26 during injection.
  • the present invention has also been found to prevent pressure disturbances being transmitted by injection chamber portion 26 to control chamber 3, thus providing for efficient operation of metering valve 18 and accurate fuel metering at each cycle.
  • the reason for this lies in the obstruction function performed by cylindrical portion 25 and the very small size of channel 27 along which such pressure disturbances would have to be transmitted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP19900103803 1989-02-28 1990-02-27 Elektromagnetischer Kraftstoffinjektor eines Dieselmotors Withdrawn EP0385398A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT5290389U IT216950Z2 (it) 1989-02-28 1989-02-28 Perfezionamento ai dispositivi di iniezione del combustibile ad azio namento elettromagnetico per motoria ciclo diesel
IT5290389U 1989-02-28

Publications (2)

Publication Number Publication Date
EP0385398A2 true EP0385398A2 (de) 1990-09-05
EP0385398A3 EP0385398A3 (de) 1991-06-19

Family

ID=11278382

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900103803 Withdrawn EP0385398A3 (de) 1989-02-28 1990-02-27 Elektromagnetischer Kraftstoffinjektor eines Dieselmotors

Country Status (3)

Country Link
EP (1) EP0385398A3 (de)
JP (1) JPH03965A (de)
IT (1) IT216950Z2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2726043A1 (fr) * 1994-10-24 1996-04-26 Daimler Benz Ag Injecteur comportant une commande par soupape magnetique pour l'injection de carburant dans la chambre de combustion d'un moteur diesel
EP0971118A2 (de) * 1998-07-06 2000-01-12 Isuzu Motors Limited Brennstoffeinspritzventil
WO2001011222A1 (de) * 1999-08-04 2001-02-15 Robert Bosch Gmbh Common-rail-injektor

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT400418B (de) * 1993-11-05 1995-12-27 Philips Electronics Nv Rasiergerät mit einem verstellbaren folienartigen obermesser
DE69626097T2 (de) * 1995-08-29 2003-10-30 Hirohisa, Tanaka Kraftstoffeinspritzvorrichtung der speichergattung
JP3823391B2 (ja) 1996-08-31 2006-09-20 いすゞ自動車株式会社 エンジンの燃料噴射装置
JP3707210B2 (ja) * 1997-07-22 2005-10-19 いすゞ自動車株式会社 燃料噴射制御装置
JP4940033B2 (ja) 2007-06-29 2012-05-30 パナソニック株式会社 計算機システム、計算機システムの制御方法および携帯電話機

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1132403A (en) * 1966-06-21 1968-10-30 Robert Huber Improvements in and relating to an electromagnetic fuel-injection valve
DE3227742A1 (de) * 1981-07-31 1983-05-11 Steyr-Daimler-Puch AG, 1010 Wien Kraftstoffeinspritzanlage fuer brennkraftmaschinen
US4603671A (en) * 1983-08-17 1986-08-05 Nippon Soken, Inc. Fuel injector for an internal combustion engine
GB2185530A (en) * 1986-01-22 1987-07-22 Dereco Dieselmotoren Forschung Fuel injection system for an internal combustion engine
DE3629646A1 (de) * 1986-08-30 1988-03-03 Bosch Gmbh Robert Elektromagnetisch betaetigbares kraftstoffeinspritzventil
DE3735526A1 (de) * 1986-10-24 1988-05-05 Nippon Denso Co Elektromagnetisches kraftstoff-einspritzventil fuer eine brennkraftmaschine
EP0228578B1 (de) * 1985-12-02 1991-09-25 Marco Alfredo Ganser Kraftstoffeinspritzanlage für Brennkraftmaschinen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1132403A (en) * 1966-06-21 1968-10-30 Robert Huber Improvements in and relating to an electromagnetic fuel-injection valve
DE3227742A1 (de) * 1981-07-31 1983-05-11 Steyr-Daimler-Puch AG, 1010 Wien Kraftstoffeinspritzanlage fuer brennkraftmaschinen
US4603671A (en) * 1983-08-17 1986-08-05 Nippon Soken, Inc. Fuel injector for an internal combustion engine
EP0228578B1 (de) * 1985-12-02 1991-09-25 Marco Alfredo Ganser Kraftstoffeinspritzanlage für Brennkraftmaschinen
GB2185530A (en) * 1986-01-22 1987-07-22 Dereco Dieselmotoren Forschung Fuel injection system for an internal combustion engine
DE3629646A1 (de) * 1986-08-30 1988-03-03 Bosch Gmbh Robert Elektromagnetisch betaetigbares kraftstoffeinspritzventil
DE3735526A1 (de) * 1986-10-24 1988-05-05 Nippon Denso Co Elektromagnetisches kraftstoff-einspritzventil fuer eine brennkraftmaschine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2726043A1 (fr) * 1994-10-24 1996-04-26 Daimler Benz Ag Injecteur comportant une commande par soupape magnetique pour l'injection de carburant dans la chambre de combustion d'un moteur diesel
US5772123A (en) * 1994-10-24 1998-06-30 Mercedes-Benz Ag And Robert Bosch Gmbh Injector with solenoid-valve control for fuel injection into diesel internal-combustion engine combustion space
EP0971118A2 (de) * 1998-07-06 2000-01-12 Isuzu Motors Limited Brennstoffeinspritzventil
EP0971118A3 (de) * 1998-07-06 2001-03-07 Isuzu Motors Limited Brennstoffeinspritzventil
WO2001011222A1 (de) * 1999-08-04 2001-02-15 Robert Bosch Gmbh Common-rail-injektor
US6705551B1 (en) 1999-08-04 2004-03-16 Robert Bosch Gmbh Common rail injector
EP1772618A1 (de) * 1999-08-04 2007-04-11 Robert Bosch Gmbh Common-Rail-Injektor

Also Published As

Publication number Publication date
IT8952903V0 (it) 1989-02-28
EP0385398A3 (de) 1991-06-19
JPH03965A (ja) 1991-01-07
IT216950Z2 (it) 1991-10-11

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