WO2002031346A1 - Compensator assembly having a flexible diaphragm for a fuel injector and method - Google Patents

Compensator assembly having a flexible diaphragm for a fuel injector and method Download PDF

Info

Publication number
WO2002031346A1
WO2002031346A1 PCT/US2001/031848 US0131848W WO0231346A1 WO 2002031346 A1 WO2002031346 A1 WO 2002031346A1 US 0131848 W US0131848 W US 0131848W WO 0231346 A1 WO0231346 A1 WO 0231346A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
piston
fuel injector
longitudinal axis
disposed
Prior art date
Application number
PCT/US2001/031848
Other languages
French (fr)
Inventor
Jack R. Lorraine
Andreas Kappel
Enrico Ulivieri
Bernhard Gottlieb
Bernhard Fischer
Original Assignee
Siemens Automotive Corporation
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 Siemens Automotive Corporation filed Critical Siemens Automotive Corporation
Priority to EP01986743A priority Critical patent/EP1325227B1/en
Priority to DE60121352T priority patent/DE60121352T2/en
Priority to JP2002534693A priority patent/JP3828490B2/en
Publication of WO2002031346A1 publication Critical patent/WO2002031346A1/en

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
    • F02M51/0603—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
    • 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
    • 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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/167—Means for compensating clearance or thermal expansion

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

A fuel injector (10) comprises a body having a longitudinal axis, a length-changing actuator (100) that has first and second ends, a closure member (40) coupled to the first end of the length-changing actuator, and a compensator assembly coupled the second end of the actuator. The length-changing actuator (100) includes first and second ends. The closure member (40) is movable between a first configuration permitting fuel injection and a second configuration preventing fuel injection. And the compensator assembly (200) axially positions the actuator with respect to the body in response to temperature variation. The compensator assembly (200) utilizes a configuration of at least one spring (260) disposed between two pistons (220, 240) so as to reduce the use of elastomer seals to thereby reduce a slip stick effect. Also, a method of compensating for thermal expansion or contraction of the fuel injector comprises providing fuel from a fuel supply to the fuel injector; and adjusting the actuator with respect to the body in response to temperature variation.

Claims

Wliat is claimed is:
1. A fuel injector, the fuel injector comprising: a housing having a first housing end and a second housing end extending along a longitudinal axis, the housing having an end member located at one of the first housing end and second housing end; a length-changing actuator disposed along the longitudinal axis; a closure member coupled to the actuator, the closure member being movable between a first configuration permitting fuel injection and a second configuration preventing fuel injection; and a compensator assembly that moves the length-changing actuator with respect to the housing in response to temperature changes, the compensator assembly including: a body having a first body end and a second body end extending along a longitudinal axis, the body having an inner surface facing the longitudinal axis; a first piston coupled to the length-changing actuator and disposed in the body proximate one of the first body end and second body end, the first piston having a first outer surface and a first working surface distal to the first outer surface, the first outer surface cooperating with the end member of the housing of the fuel injector to define a first fluid reservoir in the body; a second piston disposed in the body proximate the first piston, the second piston having a second outer surface distal to a second working surface that confronts the first working surface of the first piston; and a flexible fluid barrier coupled to one of the first and second pistons and to the body inner surface so as to define a second fluid reservoir, the second fluid reservoir being in selectable fluid communication with the first fluid reservoir.
2. The fuel injector of claim 1, wherein the flexible fluid barrier includes a first strip hermetically sealed to a portion of the first working surface and a second strip hermetically sealed to a portion of the body inner surface, the first and second strips being located
17 between the first working surface of the first piston and the second working surface of the second piston.
3. The fuel injector of claim 1, further comprising a valve disposed in one of the first and second reservoir, the valve being responsive to one of a first fluid pressure in the first fluid reservoir and a second fluid pressure in the second reservoir so as to permit fluid flow from one of the first and second fluid reservoirs to the other of the first and second fluid reservoirs.
4. The fuel injector of claim 3, wherein the first piston comprises a plurality of pockets disposed on the first outer surface of the first piston about the longitudinal axis.
5. The fuel injector of claim 4, wherein the valve comprises a plate, wherein the plate includes a plurality of orifices formed thereon, and the plate is exposed to the first fluid reservoir such that the plate projects over one of the first and second outer surfaces and whose thickness is approximately 1/94 of the square root of the surface area of one side of the plate.
6. The fuel injector of claim 1, wherein the first piston comprises an exterior first piston surface contiguous to the body inner surface so as to permit leakage of hydraulic fluid between the first and second fluid reservoirs.
7. The fuel injector of claim 1, wherein the second piston comprises an annulus disposed about the longitudinal axis, the annulus including a first surface proximal the longitudinal axis and a second surface distal therefrom.
8. The fuel injector of claim 7, further comprising an extension extending through the annulus, the extension having a first end and a second end, the first end being coupled to the first piston and the second end being coupled to the length-changing actuator.
18
9. The fuel injector of claim 8, further comprising a fluid passage disposed in one of the first and second pistons, the fluid passage permitting fluid communication between the first and second fluid reservoirs.
10. The fuel injector of claim 13, wherein the first piston comprises a first surface area in contact with the fluid and the flexible fluid barrier comprises the second working surface, the second working surface having a second surface area in contact with the fluid such that a resulting force is a function of the force of the spring member and a ratio of the first and second surface areas.
11. A hydraulic compensator for a length-changing actuator, the length-changing actuator having first and second ends, the hydraulic compensator comprising: an end member; a body having a first body end and a second body end extending along a longitudinal axis, the body having an inner surface facing the longitudinal axis; a first piston coupled to the length-changing actuator and disposed in the body proximate one of the first body end and second body end, the first piston having a first outer surface and a first working surface distal to the first outer surface, the first outer surface cooperating with the end member to define a first fluid reservoir in the body; a second piston disposed in the body proximate the first piston, the second piston having a second outer surface distal to a second working surface confronting the first working surface of the first piston; a flexible fluid barrier coupled to one of the first and second pistons and to the body inner surface so as to define a second fluid reservoir, the second fluid reservoir being in selectable fluid communication with the first fluid reservoir.
12. The compensator of claim 11, wherein the flexible fluid barrier includes a first strip hermetically sealed to a portion of the first working surface and a second strip hermetically
19 sealed to a portion of the body inner surface, the first and second strips being located between the first working surface of the first piston and the second working surface of the second piston.
13. The compensator of claim 11, further comprising a valve disposed in one of the first and second reservoir, the valve being responsive to one of a first fluid pressure in the first fluid reservoir and a second fluid pressure in the second reservoir so as to permit fluid flow from one of the first and second fluid reservoirs to the other of the first and second fluid reservoirs.
14. The compensator of claim 13, wherein the first piston comprises a plurality of pockets disposed on the first outer surface of the first piston about the longitudinal axis.
15. The compensator of claim 16, wherein the valve comprises a plate, wherein the plate includes a plurality of orifices formed thereon, and the plate is exposed to the first fluid reservoir such that the plate projects over one of the first and second outer surfaces and whose thickness is approximately 1/94 of the square root of the surface area of one side of the plate.
16. The compensator of claim 11, wherein the first piston comprises an exterior first piston surface contiguous to the body inner surface so as to permit leakage of hydraulic fluid between the first and second fluid reservoirs.
17. The compensator of claim 11, wherein the second piston comprises an annulus disposed about the longitudinal axis, the annulus including a first surface proximal the longitudinal axis and a second surface distal therefrom.
18. The compensator of claim 17, further comprising a fluid passage disposed in one of the first and second pistons, the fluid passage permitting fluid communication between the first and second fluid reservoirs.
20
19. The compensator of claim 18, wherein the first piston comprises a first surface area in contact with the fluid and the flexible fluid barrier comprises the second working surface, the second working surface having a second surface area in contact with the fluid such that a resulting force is a function of the force of the spring member and a ratio of the first and second surface areas.
20. A method of compensating for distortion of a fuel injector, the fuel injector including a housing having an end member, a body having a first body end and a second body end extending along a longitudinal axis, the body having an inner surface facing the longitudinal axis, a thermal compensator having a first piston coupled to the length- changing actuator and disposed in the body proximate one of the first body end and second body end, the first piston having a first outer surface and a first working surface distal to the first outer surface, the first outer surface cooperating with the end member to define a first fluid reservoir in the body, a second piston disposed in the body proximate the first piston having a second outer surface distal to a second working surface confronting the first working surface of the first piston, a flexible fluid barrier coupled to one of the first and second pistons and to the body inner surface so as to define a second fluid reservoir, the second fluid reservoir being in selective fluid communication with the first fluid reservoir, the method comprising: confronting a surface of the first piston to an inner surface of the body so as to form a controlled clearance between the first piston and the body inner surface; coupling a flexible fluid barrier between the first piston and the second piston such that the second piston and the flexible fluid barrier form the second fluid reservoir; pressurizing the hydraulic fluid in the first and second fluid reservoirs; and biasing the length-changing actuator with a predetermined vector resulting from changes in the volume of hydraulic fluid disposed within the first fluid reservoir as a function of temperature.
21. The method of claim 20, wherein biasing includes moving the length-changing actuator in a first direction along the longitudinal axis when the temperature is above a predetermined temperature.
21
PCT/US2001/031848 2000-10-11 2001-10-11 Compensator assembly having a flexible diaphragm for a fuel injector and method WO2002031346A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP01986743A EP1325227B1 (en) 2000-10-11 2001-10-11 Compensator assembly having a flexible diaphragm for a fuel injector and method
DE60121352T DE60121352T2 (en) 2000-10-11 2001-10-11 COMPENSATING DEVICE WITH A FLEXIBLE MEMBRANE FOR A FUEL INJECTION VALVE AND METHOD THEREFOR
JP2002534693A JP3828490B2 (en) 2000-10-11 2001-10-11 Compensator assembly and method having a flexible diaphragm for a fuel injector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US23929000P 2000-10-11 2000-10-11
US60/239,290 2000-10-11

Publications (1)

Publication Number Publication Date
WO2002031346A1 true WO2002031346A1 (en) 2002-04-18

Family

ID=22901500

Family Applications (5)

Application Number Title Priority Date Filing Date
PCT/US2001/031776 WO2002031344A1 (en) 2000-10-11 2001-10-11 Dual-spring compensator assembly for a fuel injector and method
PCT/US2001/031851 WO2002031349A1 (en) 2000-10-11 2001-10-11 Compensator assembly having a pressure responsive valve for a solid state actuator of a fuel injector
PCT/US2001/031847 WO2002031345A1 (en) 2000-10-11 2001-10-11 A pressure responsive valve for a compensator in a solid state actuator
PCT/US2001/031850 WO2002031347A1 (en) 2000-10-11 2001-10-11 Compensator assembly having a flexible diaphragm and an internal filling tube for a fuel injector and method
PCT/US2001/031848 WO2002031346A1 (en) 2000-10-11 2001-10-11 Compensator assembly having a flexible diaphragm for a fuel injector and method

Family Applications Before (4)

Application Number Title Priority Date Filing Date
PCT/US2001/031776 WO2002031344A1 (en) 2000-10-11 2001-10-11 Dual-spring compensator assembly for a fuel injector and method
PCT/US2001/031851 WO2002031349A1 (en) 2000-10-11 2001-10-11 Compensator assembly having a pressure responsive valve for a solid state actuator of a fuel injector
PCT/US2001/031847 WO2002031345A1 (en) 2000-10-11 2001-10-11 A pressure responsive valve for a compensator in a solid state actuator
PCT/US2001/031850 WO2002031347A1 (en) 2000-10-11 2001-10-11 Compensator assembly having a flexible diaphragm and an internal filling tube for a fuel injector and method

Country Status (5)

Country Link
US (5) US6676030B2 (en)
EP (5) EP1325227B1 (en)
JP (5) JP3838974B2 (en)
DE (5) DE60119355T2 (en)
WO (5) WO2002031344A1 (en)

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