Hydraulically actuated fuel injector including a pilot operated spool valve assembly and hydraulic system using same

Shafer, Scott F

Title: Hydraulically actuated fuel injector including a pilot operated spool valve assembly and hydraulic system using same

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Abstract

The present invention relates to hydraulic systems including hydraulically actuated fuel injectors that have a pilot operated spool valve assembly. One class of hydraulically actuated fuel injectors includes a solenoid driven pilot valve that controls the initiation of the injection event. However, during cold start conditions, hydraulic fluid, typically engine lubricating oil, is particularly viscous and is often difficult to displace through the relatively small drain path that is defined past the pilot valve member. Because the spool valve typically responds slower than expected during cold start due to the difficulty in displacing the relatively viscous oil, accurate start of injection timing can be difficult to achieve. There also exists a greater difficulty in reaching the higher end of the cold operating speed range. Therefore, the present invention utilizes a fluid evacuation valve to aid in displacement of the relatively viscous oil during cold start conditions.

Inventors:

Shafer, Scott F ^[1]

Morton, IL

Issue Date:: 2002-01-01

Research Org.:: Caterpillar Inc., Deerfield, IL (United States)

OSTI Identifier:: 874271

Patent Number(s):: 6354270

Assignee:: Caterpillar Inc. (Peoria, IL)

Patent Classifications (CPCs):: F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02M - SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

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F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02M - SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
F02M37/06 - mechanically driven
F02M57/025 - {hydraulic, e.g. with pressure amplification}
F02M59/42 - for starting of engines {
F02M63/0029 - {using a pilot valve controlling a hydraulic chamber}
F02M63/0036 - {with spherical or partly spherical shaped valve member ends}
F02M63/0045 - {Three-way valves}

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
Y10T137/86614 - Electric

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DOE Contract Number:: FC05-97OR22605

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: hydraulically; actuated; fuel; injector; including; pilot; operated; spool; valve; assembly; hydraulic; relates; systems; injectors; solenoid; driven; controls; initiation; injection; event; cold; start; conditions; fluid; typically; engine; lubricating; oil; viscous; difficult; displace; drain; path; defined; past; responds; slower; expected; due; difficulty; displacing; accurate; timing; achieve; exists; reaching; operating; speed; range; utilizes; evacuation; displacement; fuel injector; systems including; /123/137/239/

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                    Shafer, Scott F. Hydraulically actuated fuel injector including a pilot operated spool valve assembly and hydraulic system using same.  United States: N. p., 2002. 
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                    Shafer, Scott F. Hydraulically actuated fuel injector including a pilot operated spool valve assembly and hydraulic system using same.  United States.

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                    Shafer, Scott F. Tue .  
        "Hydraulically actuated fuel injector including a pilot operated spool valve assembly and hydraulic system using same".  United States.  https://www.osti.gov/servlets/purl/874271.

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@article{osti_874271,

  title        = {Hydraulically actuated fuel injector including a pilot operated spool valve assembly and hydraulic system using same},

  author       = {Shafer, Scott F},

  abstractNote = {The present invention relates to hydraulic systems including hydraulically actuated fuel injectors that have a pilot operated spool valve assembly. One class of hydraulically actuated fuel injectors includes a solenoid driven pilot valve that controls the initiation of the injection event. However, during cold start conditions, hydraulic fluid, typically engine lubricating oil, is particularly viscous and is often difficult to displace through the relatively small drain path that is defined past the pilot valve member. Because the spool valve typically responds slower than expected during cold start due to the difficulty in displacing the relatively viscous oil, accurate start of injection timing can be difficult to achieve. There also exists a greater difficulty in reaching the higher end of the cold operating speed range. Therefore, the present invention utilizes a fluid evacuation valve to aid in displacement of the relatively viscous oil during cold start conditions.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {2002},

  month        = {1}

}

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