Two-stage hydraulic electrically-controlled unit injector
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02M-047/00
출원번호
US-0851130
(1992-03-16)
발명자
/ 주소
Grinsteiner James J. (Roselle IL)
출원인 / 주소
Navistar International Transportation Corp. (Chicago IL 02)
인용정보
피인용 횟수 :
37인용 특허 :
0
초록▼
A two-stage, hydraulic, electronic unit fuel injector powered by lubricating oil from the engine crankcase includes a housing, a pilot valve disposed in the housing and connected to an electronically-controlled solenoid for movement with the armature thereof, a slidable poppet valve disposed in the
A two-stage, hydraulic, electronic unit fuel injector powered by lubricating oil from the engine crankcase includes a housing, a pilot valve disposed in the housing and connected to an electronically-controlled solenoid for movement with the armature thereof, a slidable poppet valve disposed in the housing beneath the pilot valve and controlled by the action of the pilot valve, and a fixed intensifier dump valve disposed within the poppet valve. An intensifier piston, controlled by the action of the poppet valve, is disposed within the housing below the intensifier dump valve which upon receiving high pressure fluid, in this case, lubricating oil, is forced downwardly to inject fuel received in the lower end of the injector from a common rail out of the injector tip under very high pressure. Both the pilot valve and the poppet valve are provided with valving arrangements, in the form of valve seats. internal passages, and registering annular grooves to provide and relieve the pressure acting respectively on the poppet valve and on the intensifier piston at various times during the injection cycle. Prior to the start of injection, the pilot valve provides high pressure to the top of the poppet valve forcing the poppet against its seat, relieving the pressure on the intensifier piston by dumping the pressurized oil externally of the injector onto the top of the cylinder head. When the pilot valve moves to start injection, it closes the high pressure source and dumps the pressurized oil above the poppet externally so that differential pressure acting upwardly on the poppet valve opens the poppet and exposes the intensifier piston to the high pressure source, causing injection. At the end of injection, the pilot valve closes, forcing the poppet down against its seat and dumping the oil from the intensifier piston causing injection to end.
대표청구항▼
In a hydraulic, electrically-controlled, unit fuel injector for an engine including a selectively operable solenoid, a high pressure valve means operated by the solenoid, and an intensifier piston chamber, said injector being hydraulically actuated to inject fuel by high pressure fluid supplied from
In a hydraulic, electrically-controlled, unit fuel injector for an engine including a selectively operable solenoid, a high pressure valve means operated by the solenoid, and an intensifier piston chamber, said injector being hydraulically actuated to inject fuel by high pressure fluid supplied from a source through said valve means to said intensifier piston chamber, the improvement wherein said valve means comprises: pilot valve means operatively coupled to said solenoid for axial movement therewith between a closed position communicating said high pressure fluid from said source through said pilot valve means and then to a poppet valve chamber and an injection position relieving high pressure fluid from said poppet chamber; and poppet valve means disposed in said poppet valve chamber for axial movement therein under the influence of said pilot valve between a closed position preventing communication of said high pressure fluid to said intensifier piston chamber, said closed position existing when said pilot valve is communicating said high pressure fluid from said source through said pilot valve means and then to said poppet valve chamber, and an injection position providing communication of said high pressure fluid to said intensifier piston chamber, said injection position existing when said pilot valve prevents communication of said high pressure fluid from said source through said pilot valve means and then to said poppet valve chamber, said poppet valve means further including dumping means providing pressure relief of said intensifier piston chamber when said poppet valve is in said closed position.
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이 특허를 인용한 특허 (37)
James Allen Kimmel ; Scott P. Dillon, Air assist fuel injectors.
Camplin Fred A. (Peoria IL) Flinn Michael A. (East Peoria IL) Graves Jeffrey D. (Pontiac IL) Zuo Lianghe (Normal IL), Fuel injection rate shaping apparatus for a unit fuel injector.
Ausman Thomas G. (Metamora IL) Delaney Timothy E. (Peoria IL) Huang Jeffrey C. (Greenwood IN) Riggert Charles R. (Metamora IL) Zimmer Michael T. (Brookfield WI), Fuel injector with pressure bleed-off stop.
Shafer, Scott F.; Stockner, Alan R.; Wiemken, Norval J.; Tian, Ye, Hydraulic fuel injection system with independently operable direct control needle valve.
Liu Chung Y. ; Ghuman Amarjit S. ; Yen Benjamin M. ; Peters Lester L. ; Smith Edward D., Hydraulically actuated fuel injector with injection rate shaping pressure intensifier.
Anderson Michael D. (Metamora IL) Gibson Dennis H. (Chillicothe IL) Hefler Gregory W. (Chillicothe IL) Maley Dale C. (Watkinsville GA) Shinogle Ronald D. (Peoria IL) Sommars Mark F. (Sparland IL), Hydraulically-actuated fuel injector with direct control needle valve.
Tsuzuki Yoshihiro,JPX ; Watanabe Kazuhide,JPX, Solenoid-operated hydraulic control valve for use in fuel injection system for internal combustion engine.
Sturman Oded E. ; North Christopher ; Strom Robert ; Massey Steven, Valve controller systems and methods and fuel injection systems utilizing the same.
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