WO2008040581A1 - Alternative fuel injector for dual fuel systems - Google Patents
Alternative fuel injector for dual fuel systems Download PDFInfo
- Publication number
- WO2008040581A1 WO2008040581A1 PCT/EP2007/057764 EP2007057764W WO2008040581A1 WO 2008040581 A1 WO2008040581 A1 WO 2008040581A1 EP 2007057764 W EP2007057764 W EP 2007057764W WO 2008040581 A1 WO2008040581 A1 WO 2008040581A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bobbin
- injector
- shutter
- fuel
- disk part
- Prior art date
Links
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.
- 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.
- 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 a directly driving the movable shutter of the injector.
- FIG. 1 is a view of a component, namely the coil bobbin, of a fuel injector of this invention
- Figure 2 is a sectional view of a component as shown in Figure 1 ;
- FIG. 3 is a plan view of the component as shown in Figure 1 ;
- - Figure 4 is a sectional view of an injector of this invention,
- FIG. 5 is a view of the injector shutter.
- 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: creating a magnetic field, via the electric winding 71 ; - guiding a movable member 10, i.e. the fuel shutter, which is directly fitted in the above mentioned central cavity 55.
- 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 are interconnected with parallel and coincident axes of revolution Al .
- 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
- 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)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2007800372661A CN101542104B (en) | 2006-10-04 | 2007-07-27 | Alternative fuel injector for dual fuel systems |
EP07787979A EP2069635B1 (en) | 2006-10-04 | 2007-07-27 | Alternative fuel injector for dual fuel systems |
BRPI0719851-5A BRPI0719851A2 (en) | 2006-10-04 | 2007-07-27 | ALTERNATE FUEL INJECTOR FOR TWO FUEL SYSTEMS |
AU2007304380A AU2007304380B2 (en) | 2006-10-04 | 2007-07-27 | Alternative fuel injector for dual fuel systems |
PL07787979T PL2069635T3 (en) | 2006-10-04 | 2007-07-27 | Alternative fuel injector for dual fuel systems |
DE602007004639T DE602007004639D1 (en) | 2006-10-04 | 2007-07-27 | ALTERNATIVE FUEL INJECTION VALVE FOR TWO-STROKE SYSTEMS |
AT07787979T ATE456741T1 (en) | 2006-10-04 | 2007-07-27 | ALTERNATIVE FUEL INJECTION VALVE FOR DUAL-FUEL SYSTEMS |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITPR2006A000086 | 2006-10-04 | ||
IT000086A ITPR20060086A1 (en) | 2006-10-04 | 2006-10-04 | ALTERNATIVE FUEL INJECTOR FOR DOUBLE CARBURATION SYSTEMS |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008040581A1 true WO2008040581A1 (en) | 2008-04-10 |
Family
ID=38894110
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2007/057764 WO2008040581A1 (en) | 2006-10-04 | 2007-07-27 | Alternative fuel injector for dual fuel systems |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP2069635B1 (en) |
CN (1) | CN101542104B (en) |
AT (1) | ATE456741T1 (en) |
AU (1) | AU2007304380B2 (en) |
BR (1) | BRPI0719851A2 (en) |
DE (1) | DE602007004639D1 (en) |
ES (1) | ES2340434T3 (en) |
IT (1) | ITPR20060086A1 (en) |
PL (1) | PL2069635T3 (en) |
WO (1) | WO2008040581A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103277223A (en) * | 2013-05-27 | 2013-09-04 | 江苏大学 | Piston valve type double fuel ejector driven by improved cam shaft |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130220274A1 (en) * | 2010-06-01 | 2013-08-29 | Cummins Intellectual Property, Inc. | Control system for dual fuel engines |
DE102014217558A1 (en) * | 2014-09-03 | 2016-03-03 | Robert Bosch Gmbh | Gas injector for gaseous fuel with cardanic storage |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61258976A (en) * | 1985-05-13 | 1986-11-17 | Nitsukisou Eiko Kk | Solenoid-driven reciprocating pump |
WO1990004099A1 (en) * | 1988-10-10 | 1990-04-19 | Siemens-Bendix Automotive Electronics L.P. | Electromagnetic fuel injector with diaphragm spring |
DE4314203C1 (en) * | 1993-04-30 | 1994-05-26 | Daimler Benz Ag | Fuel injection valve for IC engine - has servo to open nozzle needle before pump pressure is effective |
US6343751B1 (en) * | 1999-02-23 | 2002-02-05 | Aisan Kogyo Kabushiki Kaisha | Electromagnetic fuel injection valve |
EP1452717A1 (en) * | 2001-11-16 | 2004-09-01 | Hitachi, Ltd. | Fuel injection valve |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2542845Y (en) * | 2002-04-23 | 2003-04-02 | 卡洛卡里尼 | Injector for gas vehicle |
-
2006
- 2006-10-04 IT IT000086A patent/ITPR20060086A1/en unknown
-
2007
- 2007-07-27 AT AT07787979T patent/ATE456741T1/en not_active IP Right Cessation
- 2007-07-27 ES ES07787979T patent/ES2340434T3/en active Active
- 2007-07-27 AU AU2007304380A patent/AU2007304380B2/en not_active Ceased
- 2007-07-27 BR BRPI0719851-5A patent/BRPI0719851A2/en not_active Application Discontinuation
- 2007-07-27 WO PCT/EP2007/057764 patent/WO2008040581A1/en active Application Filing
- 2007-07-27 DE DE602007004639T patent/DE602007004639D1/en active Active
- 2007-07-27 CN CN2007800372661A patent/CN101542104B/en not_active Expired - Fee Related
- 2007-07-27 EP EP07787979A patent/EP2069635B1/en not_active Not-in-force
- 2007-07-27 PL PL07787979T patent/PL2069635T3/en unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61258976A (en) * | 1985-05-13 | 1986-11-17 | Nitsukisou Eiko Kk | Solenoid-driven reciprocating pump |
WO1990004099A1 (en) * | 1988-10-10 | 1990-04-19 | Siemens-Bendix Automotive Electronics L.P. | Electromagnetic fuel injector with diaphragm spring |
DE4314203C1 (en) * | 1993-04-30 | 1994-05-26 | Daimler Benz Ag | Fuel injection valve for IC engine - has servo to open nozzle needle before pump pressure is effective |
US6343751B1 (en) * | 1999-02-23 | 2002-02-05 | Aisan Kogyo Kabushiki Kaisha | Electromagnetic fuel injection valve |
EP1452717A1 (en) * | 2001-11-16 | 2004-09-01 | Hitachi, Ltd. | Fuel injection valve |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103277223A (en) * | 2013-05-27 | 2013-09-04 | 江苏大学 | Piston valve type double fuel ejector driven by improved cam shaft |
CN103277223B (en) * | 2013-05-27 | 2015-07-08 | 江苏大学 | Piston valve type double fuel ejector driven by improved cam shaft |
Also Published As
Publication number | Publication date |
---|---|
AU2007304380A1 (en) | 2008-04-10 |
CN101542104A (en) | 2009-09-23 |
PL2069635T3 (en) | 2010-07-30 |
ES2340434T3 (en) | 2010-06-02 |
DE602007004639D1 (en) | 2010-03-18 |
ITPR20060086A1 (en) | 2008-04-05 |
EP2069635B1 (en) | 2010-01-27 |
BRPI0719851A2 (en) | 2014-06-03 |
EP2069635A1 (en) | 2009-06-17 |
ATE456741T1 (en) | 2010-02-15 |
AU2007304380B2 (en) | 2013-08-15 |
CN101542104B (en) | 2012-11-07 |
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