WO2004033892A1 - Soupape d'injection de combustible gazeux a actionnement direct pourvue d'un injecteur mobile - Google Patents

Soupape d'injection de combustible gazeux a actionnement direct pourvue d'un injecteur mobile Download PDF

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Publication number
WO2004033892A1
WO2004033892A1 PCT/CA2003/001552 CA0301552W WO2004033892A1 WO 2004033892 A1 WO2004033892 A1 WO 2004033892A1 CA 0301552 W CA0301552 W CA 0301552W WO 2004033892 A1 WO2004033892 A1 WO 2004033892A1
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WO
WIPO (PCT)
Prior art keywords
nozzle
fuel
injection valve
fuel injection
sealing surface
Prior art date
Application number
PCT/CA2003/001552
Other languages
English (en)
Inventor
Michael Hebbes
Randall T. Mark
Original Assignee
Westport Research Inc.
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 Westport Research Inc. filed Critical Westport Research Inc.
Priority to AU2003273698A priority Critical patent/AU2003273698A1/en
Publication of WO2004033892A1 publication Critical patent/WO2004033892A1/fr

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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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0248—Injectors
    • F02M21/0257—Details of the valve closing elements, e.g. valve seats, stems or arrangement of flow passages
    • F02M21/026—Lift valves, i.e. stem operated valves
    • F02M21/0263—Inwardly opening single or multi nozzle valves, e.g. needle 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0248—Injectors
    • F02M21/0251—Details of actuators therefor
    • F02M21/0254—Electric actuators, e.g. solenoid or piezoelectric
    • 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
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Definitions

  • the present invention relates generally to high pressure fuel injection valves or injectors for internal combustion engines, and, more specifically, to a fuel injection valve with a stationary needle and a movable nozzle that is directly controllable by a position activating material (such as, for example, a piezoelectric or magnetostrictive material).
  • the invention also relates to a method of operating a directly actuated fuel injection valve with a movable nozzle.
  • the apparatus and method are particularly suitable for injecting gaseous fuels directly into the combustion chamber of an internal combustion engine.
  • Direct injection of a gaseous fuel into the combustion chamber of an internal combustion engine is desirable for several reasons. For example, direct injection allows charge stratification, eliminating throttling losses associated with homogeneous charge engines. Additionally, with direct injection late in the compression stroke, a high-compression ratio can be maintained for higher efficiency. Further, when the directly injected fuel comprises methane, natural gas, propane, ethane, other gaseous combustible hydrocarbon derivatives, or hydrogen, compared to liquid fuels such as diesel fuel, the emissions of NO x and particulate matter (PM) are significantly reduced.
  • the directly injected gaseous fuel can be ignited with a glow plug, with a spark plug or with a small amount of pilot diesel fuel.
  • the gaseous fuel needs to be injected at high pressure to overcome the combustion chamber pressure, which is high at the end of the compression stroke (near top dead center).
  • the injection pressure is high enough to promote good mixing between the injected fuel and the combustion chamber air.
  • the gaseous fuel injection pressure is preferably at least about 3000 psi (21 MPa); however, this is much less than the pressures typical of diesel-fueled engines, which typically inject liquid diesel fuel into the combustion chamber at pressures of at least about 22,000 psi (150 MPa). Higher pressures are preferred by conventional diesel engines for atomization of the liquid fuel.
  • Conventional fuel injection valves typically employ a movable needle disposed within an injection valve body. Injection valves normally have a nozzle or injector tip that is held in a fixed position with respect to the injection valve body.
  • Co-owned U.S. Patent No. 6,298,829 discloses an injection valve with such an arrangement.
  • the injection valve described in the '829 Patent is suitable for injecting gaseous fuels directly into the combustion chamber of an internal combustion engine.
  • the '829 Patent discloses a valve needle that is lifted away from a seat surface provided in the nozzle of the injection valve.
  • the fuel is introduced into the injection valve at an end that is opposite to the nozzle, and the fuel flows through the valve body, which also houses a piezoelectric or magnetostrictive actuator. While this arrangement may be suitable for fuels such as natural gas, with other gaseous fuels such as hydrogen, it may not be desirable to have the fuel flowing through the whole injection valve body, because such fuels may be incompatible with some of the materials of the inner valve components, including the actuator.
  • U.S. Patent No. 5,031,841 (the '841 patent) describes a metering valve using an actuating member, which according to the patent could be a piezoelectric stack or a magnetostrictive actuator.
  • One feature disclosed by the '841 patent is the addition of a diaphragm which has the dual purpose of acting as a spring, biasing the valve in its closed position, and, of providing a seal between the metered fluid and the actuator.
  • the '841 patent discloses an adjusting screw for mechanically setting the position of the actuator within the housing.
  • the movable valve needle is rigidly connected to the actuator by a pressure pin.
  • a problem of this design includes the size and shape of the injection valve body necessary to accommodate the diaphragm, as well as the durability requirements of the diaphragm to resist failure.
  • a directly actuated fuel injection valve for injecting a gaseous fuel into a combustion chamber.
  • the injection valve comprises:
  • valve body comprising: a fuel inlet passage; and a fuel cavity fiuidly connected to the fuel inlet passage;
  • a nozzle comprising at least one nozzle orifice through which the gaseous fuel is injectable into the combustion chamber, wherein the nozzle is associated with an end of the valve body and movable in relation thereto between: a closed position, wherein the nozzle is seated against a sealing surface to provide a boundary between the fuel cavity and the at least one nozzle orifice; an open position, wherein the nozzle is spaced apart from the sealing surface; (c) a spring for biasing the nozzle in the closed position; and
  • the fuel injection valve preferably further comprises a needle member fixedly associated with the valve body and extending into an interior space within the nozzle.
  • the sealing surface is associated with the needle member.
  • the fuel cavity is preferably associated with the nozzle so that it is close to the nozzle orifices.
  • a fuel supply passage for supplying fuel from the fuel inlet passage to the fuel cavity may comprise a fluid passage provided within the needle member.
  • the combustion chamber is one of a plurality of combustion chambers in a multi-cylinder engine
  • the fuel injection valve is preferably one of a plurality of fuel injection valves, each associated with a respective combustion chamber.
  • the actuator preferably comprises a magnetostrictive or piezoelectric member that expands in a direction that is parallel to the direction of movement of the nozzle.
  • a magnetostrictive member When a magnetostrictive member is employed, it expands in length when it is subjected to a magnetic field.
  • a piezoelectric member When a piezoelectric member is employed, it expands in length when it is energized by the application of a voltage to the piezoelectric elements.
  • the valve nozzle, actuated by a magnetostrictive or piezoelectric actuator assembly is controllable to move between the closed and open positions in less than about 250 microseconds.
  • the magnetostrictive or piezoelectric member is preferably in the shape of a solid cylinder, which may be pre-loaded with a compressive force.
  • a compression spring member may be employed for applying a compressive force to pre-load the magnetostrictive member or piezoelectric stack.
  • the compression spring member comprises at least one disc spring (also known as a Belleville spring or Belleville washer).
  • a magnetostrictive material that is suitable for use in the present injection valve comprises a material known as ETREMA Terfenol-D ® magnetostrictive alloy that is available from Etrema Products Inc.
  • ETREMA Terfenol-D ® magnetostrictive alloy is a metal alloy composed of the elements terbium, dysprosium, and iron.
  • the actuator is preferably housed within a chamber within the valve body that is fluidly isolated from the gaseous fuel.
  • a passive hydraulic link assembly is preferably disposed between the actuator and the nozzle, whereby actuating forces for lifting the nozzle away from the sealing surface are transmitted through the passive hydraulic link assembly.
  • the passive hydraulic link assembly preferably comprises a piston disposed within a fluidly sealed cylinder that is filled with a liquid.
  • An advantage of the present injection valve is that it provides an injection valve that eliminates the need for an active hydraulic operator and the associated high-pressure hydraulic system for generating the actuation force to actuate the injection valve.
  • Conventional active hydraulic operators are different from the passive hydraulic link of the present invention, which is described as a "passive" hydraulic link because the hydraulic fluid sealed within the passive hydraulic link assembly merely transmits the actuating forces but is not employed to generate an actuating force for actuating the valve.
  • the passive hydraulic link is to provide a load path for the opposing actuating forces that originate from at least one spring member and the actuator assembly, which preferably comprises a magnetostrictive or piezoelectric element.
  • actuating forces are transmitted between the passive hydraulic link assembly and the movable nozzle through at least one rigid member may be disposed therebetween.
  • a rigid member may extend through an open space provided within the valve body and/or the needle member.
  • a plurality of rigid members may be employed to distribute the actuating forces over a larger cross-sectional area.
  • a rigid plate may be disposed between the plurality of rigid members and the nozzle member to help distribute the actuation forces transmitted through the rigid member(s).
  • the nozzle comprises a hollow cylindrical body with an annular shoulder provided in the hollow interior axially between the nozzle orifice and the fuel cavity for cooperating with a sealing surface associated with the needle member.
  • the nozzle preferably further comprises a flanged end disposed within the valve body.
  • the spring for biasing the nozzle in the closed position is disposed between a lateral surface of the flanged end and the valve body, whereby the flanged end cooperates with the spring for biasing the nozzle in the closed position.
  • the injection valve comprises:
  • valve body comprising: a fuel inlet passage; and a fuel cavity fluidly connected to the fuel inlet passage;
  • a nozzle comprising at least one nozzle orifice through which the fuel is injectable into the combustion chamber, the nozzle disposed around the needle member and movable in relation to the needle member between: a closed position, wherein the nozzle is seated against a sealing surface of the needle member, to provide a boundary between the fuel cavity and the at least one nozzle orifice; an open position, wherein the nozzle is spaced apart from the sealing surface of the needle member;
  • an actuator for moving the nozzle to the open position against the bias of the spring comprising an actuating member that is expandable in a direction parallel to the direction of movement of the nozzle
  • the actuating member preferably comprises a magnetostrictive or piezoelectric material.
  • the actuator is housed within a chamber of the valve body that is fluidly isolated from the fuel.
  • the fuel may be a gaseous or liquid fuel that is a cleaner burning fuel, compared to diesel fuel.
  • fuels include natural gas, methane, propane, ethane, and hydrogen. Isolating the actuator from the fuel is particularly advantageous, with fuels such as hydrogen, which may be reactive with some of the actuator components.
  • the valve body may comprise a plurality of parts, which are joined with each other to provide a fluidly sealed body.
  • the valve housing may comprise a hollow upper housing, a hollow lower housing, and a removable needle member.
  • the removable needle member When the removable needle member is installed, it is fixedly associated with the valve body, but if it gets worn down, it can be replaced by separating the upper and lower housings and removing the needle member.
  • a method is provided of injecting a gaseous fuel into a combustion chamber of an internal combustion engine.
  • the method comprises: introducing a gaseous fuel into a fuel cavity within an injection valve body; containing the gaseous fuel within the fuel cavity by seating a movable nozzle against a sealing surface associated with the injection valve body; commencing an injection event by lifting the movable nozzle away from the sealing surface; and terminating an injection event by re-seating the movable nozzle against the sealing surface.
  • the gaseous fuel is delivered to the fuel cavity from a common rail fuel supply system.
  • the fuel pressure within the fuel cavity is preferably at least about 1000 psi (about 6.9 MPa), and more preferably greater than about 2000 psi (greater than about 13.8 MPa) when the engine is operating.
  • the preferred method further comprises lifting the movable nozzle away from the sealing surface for the duration of an injection event, and controlling the speed of nozzle movement between the open and closed positions as well as the distance the nozzle is lifted from the sealing surface.
  • Figure 1 is a cross-sectional view of a preferred embodiment of a directly actuated fuel injection valve with a movable nozzle
  • Figure 2 is an enlarged cross-sectional view of the nozzle end of the fuel injection valve of Figure 1.
  • FIGS. 1 and 2 are both cross-sectional views with Figure 2 being an enlarged detailed view of the nozzle end of fuel injection valve 100.
  • Fuel injection valve 100 comprises a valve body 102, which comprises fuel inlet passage 104 and fuel cavity 106, which is fluidly connected to fuel inlet passage 104.
  • Fuel cavity 106 comprises an annular space between needle 120 and nozzle 110.
  • Fuel inlet passage 104 may comprise passages provided within valve body 102 and needle 120, and in spaces defined therebetween.
  • fuel inlet passage 104 comprises bore 122 and branches 124 and 126 provided within an upper portion of needle 120, through which gaseous fuel may flow on its way to fuel cavity 106.
  • the fuel passages are constructed so that gaseous fuel may flow through fuel inlet passage 104 to fuel cavity 106 without contacting actuator assembly 130 or passive hydraulic link assembly 140.
  • Seals such as o-ring seals 108 fluidly isolate the pressurized fuel passages from passive hydraulic link assembly 140. Seal 109 prevents gaseous fuel from escaping from fuel cavity 106, through the gap between nozzle 110 and needle 120.
  • seals known to those skilled in the art may be employed instead of the o- ring seals that are shown in Figures 1 and 2 for illustrative purposes.
  • needle 120 is fixedly associated with valve body 102.
  • needle 120 is a removable component so that it can be replaced if the sealing surface becomes worn.
  • Manufacturing needle 120 as a separate component also facilitates the manufacturing of the fuel passages for supplying the gaseous fuel to fuel cavity 106. Unlike conventional gaseous fuel injection valves, once assembled, installed, and operational, needle 120 is stationary with respect to valve body 102.
  • Nozzle 110 comprises at least one nozzle orifice 112 through which gaseous fuel is injectable into a combustion chamber.
  • the tip of nozzle 110 that extends out of the valve body is the only part of fuel injection valve 100 that is directly exposed to the engine combustion chamber, with most of valve body 102 disposed within the engine cylinder head or above the cylinder head.
  • Nozzle 110 is movable with respect to valve body 102 and needle 120.
  • Fuel injection valve 100 is closed when nozzle 110 is seated against a sealing surface of needle 120, and is opened when nozzle 110 is lifted away from the sealing surface in the direction of the combustion chamber, defined herein as the outward direction.
  • the sealing surface is that portion of needle 120, which contacts nozzle 110 when nozzle 110 is urged towards needle 120.
  • this direction of movement is defined herein as inward movement.
  • Controlling the distance nozzle 110 is lifted away from the sealing surface of needle 120, during an injection event, can influence the rate of injecting gaseous fuel into the combustion chamber.
  • the greater the distance that nozzle 110 is lifted away from the sealing surface the greater the mass flow rate of gaseous fuel into the combustion chamber.
  • An upper limit on mass flow rate is eventually reached when the open area of the nozzle orifices limits the flow.
  • the timing for injecting gaseous fuel during an injection event can also be controlled by changing the lift distance and fuel mass flow rate during an injection event. This technique is defined herein as "rate shaping" because nozzle lift is controllable to influence the mass flow rate of gaseous fuel injection into the combustion chamber.
  • Rate shaping is made possible by employing an actuator assembly 130 comprising magnetostrictive or piezoelectric elements to directly actuate nozzle 110.
  • Conventional hydraulically actuated injection valves do not have the same capability for rate shaping as directly actuated injection valves.
  • Spring 114 is disposed between an annular shoulder provided by valve body 102 and flange 116 of nozzle 110. With the illustrated arrangement, spring 114 biases nozzle 110 in the closed position.
  • Spring 114 is illustrated as a disc spring, which is also known as a Belleville washer or Belleville spring. As those skilled in the art would understand, other types of springs may be substituted to achieve substantially the same result.
  • the illustrated embodiment of actuator assembly 130 comprises solid magnetostrictive member 132.
  • the cross-sectional area of magnetostrictive member 132 is dictated by the force necessary to overcome all of the opposing forces that hold nozzle 110 in the closed position. A greater cross-sectional area results in larger opening forces. Because the cross-sectional area of magnetostrictive member 132 is solid, its diameter can be smaller than the diameter of the tubular magnetostrictive member disclosed in the '829 Patent referred to above. Employing known manufacturing techniques, a solid rod is also much easier to manufacture compared to a tubular member.
  • Spool 134 holds electric coil 136.
  • Flux tube 138 surrounds electric coil 136 and spool 134. Flux tube 138 can have a lengthwise slit to break eddy currents.
  • an electric current is supplied to energize electric coil 136, causing a magnetic flux to develop that flows through magnetostrictive member 132.
  • magnetostrictive member 132 When a magnetic flux flows through magnetostrictive member 132 an actuating force is generated by magnetostrictive member 132 expanding in length, towards nozzle 110.
  • a stack of piezoelectric elements may be substituted for illustrated actuator assembly 130.
  • the actuating force generated by actuator assembly 130 is ultimately transmitted to nozzle 110 through passive hydraulic link assembly 140 and rigid force transmitting members that may be employed between actuator assembly 130 and passive hydraulic link assembly 140, and between passive hydraulic link assembly 140 and nozzle 110.
  • the '829 Patent discloses a directly actuated injection valve that employs a piezoelectric or magnetostrictive actuator combined with a passive hydraulic link.
  • the passive hydraulic link employed in preferred embodiments of the present injection valve operates on the same principle as the passive hydraulic link disclosed in the '829 Patent.
  • Passive hydraulic link assembly 140 employs piston 142 disposed within a cylinder with closed end 146. Piston stem 142a (indicated in Figure 2) protrudes from an open end of the cylinder.
  • the cylinder is filled with hydraulic fluid to provide a means for automatically resetting the position of nozzle 110 to account for wear and differential thermal expansion of the valve components. Seal 144 prevents the hydraulic fluid from leaking from the cylinder.
  • the hydraulic fluid between closed end 146 and piston 142 does not have time to flow from one side of the piston to the other, so piston 142 maintains its position within the cylinder and the actuation forces are transmitted through the hydraulic fluid layer between closed end 146 and piston 142. Because no significant amount of the hydraulic fluid is displaced during an injection event, the hydraulic fluid acts as a solid in the sense that its thickness between piston 142 and closed end 146, through which the actuation forces are transmitted, is substantially constant during the injection event. That is, the volume occupied by the hydraulic fluid between piston 142 and closed end 146 remains substantially constant, as does the dimensional shape of that volume.
  • the relatively longer time durations between injection events when fuel injection valve 100 is closed allows some flow of hydraulic fluid from one side of piston 142 to the other side, which enables the passive hydraulic link to self-adjust itself when fuel injection valve 100 is closed to account for dimensional changes caused by wear or differential thermal expansion. While the passive hydraulic link can compensate for such changes in the dimensional relationships between valve components, the functional demands placed upon the passive hydraulic link may be reduced by the selection of materials for the valve components that have similar thermal expansion coefficients.
  • rigid member 152 which transmits actuating forces to nozzle 110 through a plurality of rigid members, which extend through open spaces provided within needle 120.
  • rigid members 152 are solid cylindrical rods with longitudinal axes parallel to that of nozzle 110
  • Spring 148 is compressed when fuel injection valve 100 is assembled, and spring 148 ensures that closed end 146 of passive hydraulic link assembly 140 is always in contact with actuator assembly 130. Spring 148 may also be employed to provide a compression force to the actuator assembly to increase the potential travel of the magnetostrictive or piezoelectric member.
  • Spring 150 is provided within the cylinder between piston 142 and closed end 146 to ensure that piston stem 142a is always in contact with rigid members 152, and that rigid members 152 are always in contact with flange 116.
  • Naive body 102 is shown in the illustrated embodiment as a single piece.
  • each of the internal components is inserted into the valve body through the upper end. Installing an end cap completes assembly of the internal components of fuel injection valve 100.
  • the valve body may be made from a plurality of parts.
  • an upper valve body which houses actuator assembly 130 and passive hydraulic link assembly 140
  • a lower valve body which houses most of needle 120 and the flanged end of nozzle 110.
  • the exact location of the joint between the upper valve body and lower valve body can be arbitrary without affecting the functionality or operation of fuel injection valve 100.
  • a nozzle sleeve can be attached to the needle, which is in turn attached to an upper valve body.
  • the method comprises introducing the fuel into a fuel cavity within an injection valve body, containing the fuel within the fuel cavity by seating a movable nozzle against a sealing surface associate with the injection valve body, commencing an injection event by lifting the movable nozzle away from the sealing surface, spacing the nozzle a distance away from the sealing surface for the duration of an injection event, and terminating the injection event by re-seating the movable nozzle against the sealing surface.
  • the fuel may be a liquid or gaseous fuel that is cleaner burning compared to diesel fuel. Examples of such cleaner burning fuels include, natural gas, methane, propane, ethane, and hydrogen.
  • This preferred method may further comprise shaping the fuel injection rate and/or fuel mass injected during an injection event by controlling the distance the nozzle is lifted away from the sealing surface and/or the overall duration of the injection event.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Analytical Chemistry (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne une soupape d'injection de combustible à actionnement direct conçue pour injecter un combustible gazeux dans une chambre de combustion. Cette soupape d'injection de combustible comprend un corps (102) comportant une cavité à combustible (106) dans laquelle un combustible est acheminé par un passage d'entrée de combustible. Un injecteur (110) associé à une extrémité du corps (104) de la soupape comprend au moins un orifice (112) à travers lequel le combustible gazeux peut être injecté dans la chambre de combustion. Cet injecteur (110) peut être déplacé par rapport au corps de la soupape entre une position fermée, dans laquelle l'injecteur (110) est appuyé contre une surface d'étanchéité de façon à former une séparation entre la cavité à combustible (106) et le ou les orifices de l'injecteur, et une position ouverte, dans laquelle l'injecteur est éloigné de la surface d'étanchéité. Un ressort sollicite l'injecteur (110) en position fermée, un élément d'actionnement (130) pouvant être activé pour déplacer l'injecteur en position ouverte à l'encontre de la force du ressort (114).
PCT/CA2003/001552 2002-10-09 2003-10-08 Soupape d'injection de combustible gazeux a actionnement direct pourvue d'un injecteur mobile WO2004033892A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003273698A AU2003273698A1 (en) 2002-10-09 2003-10-08 Directly actuated gaseous fuel injection valve with a movable nozzle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA002406883A CA2406883C (fr) 2002-10-09 2002-10-09 Soupape d'injection de carburant gazeux directement actionnee par une buse mobile
CA2,406,883 2002-10-09

Publications (1)

Publication Number Publication Date
WO2004033892A1 true WO2004033892A1 (fr) 2004-04-22

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PCT/CA2003/001552 WO2004033892A1 (fr) 2002-10-09 2003-10-08 Soupape d'injection de combustible gazeux a actionnement direct pourvue d'un injecteur mobile

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AU (1) AU2003273698A1 (fr)
CA (1) CA2406883C (fr)
WO (1) WO2004033892A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4306072A1 (de) * 1993-02-26 1994-09-08 Siemens Ag Vorrichtung zum Öffnen und Verschließen einer in einem Gehäuse vorhandenen Durchtrittsöffnung
DE19838862A1 (de) * 1998-08-26 2000-03-09 Siemens Ag Dosiervorrichtung
DE10042570A1 (de) * 2000-08-25 2002-03-14 Univ Dresden Tech Kraftstoffeinspritzdüse für Brennkraftmaschinen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4306072A1 (de) * 1993-02-26 1994-09-08 Siemens Ag Vorrichtung zum Öffnen und Verschließen einer in einem Gehäuse vorhandenen Durchtrittsöffnung
DE19838862A1 (de) * 1998-08-26 2000-03-09 Siemens Ag Dosiervorrichtung
DE10042570A1 (de) * 2000-08-25 2002-03-14 Univ Dresden Tech Kraftstoffeinspritzdüse für Brennkraftmaschinen

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CA2406883C (fr) 2004-02-24
CA2406883A1 (fr) 2003-01-22
AU2003273698A1 (en) 2004-05-04

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