EP2069635B1 - Alternative fuel injector for dual fuel systems - Google Patents

Alternative fuel injector for dual fuel systems

Info

Publication number
EP2069635B1
EP2069635B1 EP07787979A EP07787979A EP2069635B1 EP 2069635 B1 EP2069635 B1 EP 2069635B1 EP 07787979 A EP07787979 A EP 07787979A EP 07787979 A EP07787979 A EP 07787979A EP 2069635 B1 EP2069635 B1 EP 2069635B1
Authority
EP
European Patent Office
Prior art keywords
bobbin
injector
shutter
fuel
disk part
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.)
Not-in-force
Application number
EP07787979A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2069635A1 (en
Inventor
Vincenzo Baroni
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.)
A E B Srl
Original Assignee
A E B 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=38894110&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2069635(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by A E B Srl filed Critical A E B Srl
Priority to PL07787979T priority Critical patent/PL2069635T3/pl
Publication of EP2069635A1 publication Critical patent/EP2069635A1/en
Application granted granted Critical
Publication of EP2069635B1 publication Critical patent/EP2069635B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0667—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature acting as a valve or having a short valve body attached thereto
    • 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
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F02M43/04—Injectors peculiar thereto
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/14—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel having cyclically-operated valves connecting injection nozzles to a source of fuel under pressure during the injection period
    • F02M69/145—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel having cyclically-operated valves connecting injection nozzles to a source of fuel under pressure during the injection period the valves being actuated electrically

Definitions

  • the present invention relates to an alternative fuel injector for dual fuel systems, particularly for use in the field of fuel systems of internal combustion engines using gaseous fuel.
  • the injectors may be solenoid-operated, in which case they are under electronic control (electronically controlled injectors), like in most mass-produced automotive gasoline engines or mechanical engines.
  • a movable member such as a shutter, allows high pressure fuel outflow.
  • an electric current reaches a winding and, by generating a magnetic field, lifts an internal member which in turn moves the needle, thereby allowing fuel outflow.
  • DE 4314203 C shows a solenoid-operated fuel injector.
  • Engines operating on these fuels are less pollutant than those that use traditional fuels, such as gasoline or diesel oil, and are usually sold at a lower cost to promote use thereof.
  • These new-generation gas supply systems are usually composed of a tank for storage of the gaseous fuel, fuel check valves, a pipe that carries fuel from the tank to a pressure reducer, a pipe that carries the gas from the pressure reducer to a set of injectors which are designed to dose the amount of gas to be supplied to the engine, and are controlled by a controller that is designed to control the whole system.
  • one or more of these features is either already lacking in new injectors or is lost during a certain operating time.
  • a first apparent problem is noise: as fuel flow is opened, certain injectors emit a very high noise which, in certain cases, can affect driving comfort.
  • a second problem, that only arises after a certain operating time, is that they are sensitive to dirt, usually grease or oil, when these are present in the gas.
  • gases contain oil, grease or other impurities which infiltrate between the various components of the injectors and slow down or even stop the motion of the movable member, i.e. the shutter, which causes opening and closing of the gas flow.
  • Another frequent problem is degradation of the properties of the injector, with changing opening-closing times and flow rates, this being usually caused by the changing size of the noise damping element, which usually also sets the gap between the shutter and the stationary magnetic part.
  • the size change has an effect on the flow rate, whereas the gap change usually causes an extension of the closing times of the injector.
  • Another problem, which usually occurs at low temperatures is that sometimes the injector is not able to open the fuel flow.
  • the shutter has a barely sufficient force when all the operation parameters are within certain limits, and a slight increase of the reducer pressure or a slight decrease of temperature can reduce the magnetic properties of the system, and increase the density of any grease present therein, to such an extent that the injectors can no longer operate.
  • the object of this invention is to provide an injector for dual fuel systems that has such a construction as to obviate all the above problems, by the provision of a multifunctional coil-, i.e. winding-support bobbin, that has the additional function of directly driving the movable shutter of the injector.
  • numeral 5 designates a coil bobbin of a fuel injector 1 of this invention, which is shown in Figure 4 in sectional view.
  • the bobbin 5 is essentially formed of a hollow cylindrical central body 50, with two outer flanges or edges 51 and 52 defining an annular space 70 in which an electric cable for generating the requested magnetic field is suitably wound.
  • the bobbin 5 also has connectors 21 and 22 for the necessary electric contacts to be created therewith.
  • a plurality of grooves 54 extend in rectilinear longitudinal directions over the skirt 53 of the central cavity 55; such grooves 54, or slits, may also have a curvilinear extension.
  • the coil bobbin 5 has a dual function:
  • the bobbin 5 is substantially a multifunctional support.
  • the above mentioned slits 54 are formed for the purpose of avoiding pressure increase and decrease as the movable member 10 moves, particularly due to the presence of grease and oil, and allow ejection of dirt.
  • an injector 1 as mentioned above is shown, which comprises a base revolving body 14 having a first support 15 fitted therein, for receiving at its center the bobbin 5 described above; said bobbin 5 being held in position by a second element 16, namely by the shank 16a thereof which is fitted in the central cavity 55 of the bobbin 5.
  • This second element 16 closes on the first element 15 and both are clamped together by a cover 17 pressed or screwed thereon.
  • All the elements 14 , 15 , 16, 17 and 5 (as well as the popped 10 as disclosed below) are interconnected with parallel and coincident axes of revolution A1.
  • the shutter 10 is interposed between the bobbin 5 and the base body 14, to open and close the body 100 of the latter and control fuel outflow, and is normally held in the flow stopping position by a suitable spring M, in the illustrated case a spring M that operates on the shutter 10 and the support 16 in specially constructed recesses.
  • the shutter 10 is composed of two parts, a disk 10b and a cylindrical extension 10a extending therefrom, which is fitted, i.e. inserted in the cavity 55 of the bobbin 5, the disk part 10b being adapted to alternately abut against the hole 100 or the bobbin 5, depending on the attractive action of the electromagnetic field.
  • the injector 1 emits little noise, because the movable member, or shutter 10, abuts against the bobbin 5 which is formed of non excessively rigid material and partly absorbs shocks thereby reducing noise.
  • Two seals 31 and 32 are provided between the bobbin 5 and its supports 15 and 16 to prevent any gas leakage.
  • the bobbin 5 is formed of any non magnetic, self-lubricating material: this obviates or at least attenuates the problem of wear of the movable parts; by this arrangement, the movable parts are exposed to much lower stresses caused by the contact with the self-lubricating material.
  • the present injector 1 encounters no opening problem, even under overpressure conditions, which means that the system has a very effective opening operation, because the magnetic assembly is easily oversized thanks to the dual cylinder-disk shape of the movable member 10, which ensures an effective operation of the electromagnetic assembly, thereby providing a member that has a sufficiently light weight to allow displacement thereof while ensuring guidability within the cavity of the coil bobbin 5, as if it were a piston: this combines the advantages of the piston and the disk when used as a movable member, and reduces the disadvantages of both.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
EP07787979A 2006-10-04 2007-07-27 Alternative fuel injector for dual fuel systems Not-in-force EP2069635B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07787979T PL2069635T3 (pl) 2006-10-04 2007-07-27 Alternatywny wtryskiwacz paliwa dla systemów dwupaliwowych

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000086A ITPR20060086A1 (it) 2006-10-04 2006-10-04 Iniettore di carburante alternativo per sistemi a doppia carburazione
PCT/EP2007/057764 WO2008040581A1 (en) 2006-10-04 2007-07-27 Alternative fuel injector for dual fuel systems

Publications (2)

Publication Number Publication Date
EP2069635A1 EP2069635A1 (en) 2009-06-17
EP2069635B1 true EP2069635B1 (en) 2010-01-27

Family

ID=38894110

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07787979A Not-in-force EP2069635B1 (en) 2006-10-04 2007-07-27 Alternative fuel injector for dual fuel systems

Country Status (10)

Country Link
EP (1) EP2069635B1 (zh)
CN (1) CN101542104B (zh)
AT (1) ATE456741T1 (zh)
AU (1) AU2007304380B2 (zh)
BR (1) BRPI0719851A2 (zh)
DE (1) DE602007004639D1 (zh)
ES (1) ES2340434T3 (zh)
IT (1) ITPR20060086A1 (zh)
PL (1) PL2069635T3 (zh)
WO (1) WO2008040581A1 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011153069A1 (en) * 2010-06-01 2011-12-08 Cummins Intellectual Properties, Inc. Control system for dual fuel engines
CN103277223B (zh) * 2013-05-27 2015-07-08 江苏大学 一种由改进凸轮轴驱动的活塞阀式双燃料喷射器
DE102014217558A1 (de) * 2014-09-03 2016-03-03 Robert Bosch Gmbh Gasinjektor für gasförmigen Kraftstoff mit kardanischer Lagerung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61258976A (ja) * 1985-05-13 1986-11-17 Nitsukisou Eiko Kk 電磁駆動形往復動ポンプ
DE3834444A1 (de) * 1988-10-10 1990-04-12 Mesenich Gerhard Elektromagnetisches einspritzventil mit membranfeder
DE4314203C1 (de) * 1993-04-30 1994-05-26 Daimler Benz Ag Mit einer Hochdruckpumpe zusammenwirkendes Kraftstoffeinspritzventil für eine direkteinspritzende Brennkraftmaschine
US6343751B1 (en) * 1999-02-23 2002-02-05 Aisan Kogyo Kabushiki Kaisha Electromagnetic fuel injection valve
JP4011547B2 (ja) * 2001-11-16 2007-11-21 株式会社日立製作所 燃料噴射弁
CN2542845Y (zh) * 2002-04-23 2003-04-02 卡洛卡里尼 适用于燃气车辆的喷嘴

Also Published As

Publication number Publication date
AU2007304380A1 (en) 2008-04-10
ATE456741T1 (de) 2010-02-15
BRPI0719851A2 (pt) 2014-06-03
ES2340434T3 (es) 2010-06-02
ITPR20060086A1 (it) 2008-04-05
PL2069635T3 (pl) 2010-07-30
EP2069635A1 (en) 2009-06-17
CN101542104B (zh) 2012-11-07
CN101542104A (zh) 2009-09-23
WO2008040581A1 (en) 2008-04-10
AU2007304380B2 (en) 2013-08-15
DE602007004639D1 (de) 2010-03-18

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