Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1996-07-25
1997-10-14
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Fuel injection system
123456, F02M 4100, F02M 700
Patent
active
056761147
ABSTRACT:
The improved needle controlled common rail fuel system of the present invention includes split common rails serving respective sets of injectors and a respective high pressure pump associated with each rail. The high pressure pumps reciprocate to cyclically create gradual periods of increasing pressure in the common rail during the advancement stroke of the plunger followed by respective periods of decreasing pressure during the plunger's retraction stroke. The fuel injectors include an injection control valve and a needle control device for creating an injection event during a pumping event by controlling the fuel flow to drain so as to control the fuel pressure forces acting on an injector needle valve element. A flow limiting device is provided to limit the fuel flow from a control volume to drain during an injection event thus reducing parasitic losses while maintaining quick valve closing. The system also includes an improved fuel injector design including an intensification plunger assembly. In addition, a pressure energy recuperation means is provided which utilizes the pressure of the fuel in the common rail and the fuel injectors as a result of the pressure energy stored in the fuel to assist in retraction of the high pressure pump plunger during each pumping event. In addition, a wiring connection harness is provided which permits the connection of an electrically operated fuel delivery device, i.e. injector, to an electrical source simultaneously with the mounting of the fuel delivery device on the engine.
REFERENCES:
patent: 4069800 (1978-01-01), Kanda et al.
patent: 4170974 (1979-10-01), Kopse et al.
patent: 4211202 (1980-07-01), Hafner
patent: 4219154 (1980-08-01), Luscomb
patent: 4249497 (1981-02-01), Eheim et al.
patent: 4364360 (1982-12-01), Eheim et al.
patent: 4440132 (1984-04-01), Terada et al.
patent: 4784101 (1988-11-01), Iwanaga et al.
patent: 5094215 (1992-03-01), Gustafson
patent: 5133645 (1992-07-01), Crowley et al.
patent: 5176120 (1993-01-01), Takahashi
patent: 5265804 (1993-11-01), Brunel
patent: 5421521 (1995-06-01), Gibson et al.
patent: 5441028 (1995-08-01), Felhofer
patent: 5463996 (1995-11-01), Maley et al.
patent: 5509391 (1996-04-01), Degroot
patent: 5577479 (1996-11-01), Popp
D.H. Gibson et al., "Meeting the Customer's Needs --Defining the Next Generation Electronically Controlled Unit Injector Concept for Heavy Duty Engines," SAE Technical Paper 961285, Apr. 16-17, 1996.
Carroll, III John T.
Crofts John D.
Tarr Yul J.
Tikk Laszlo D.
Brackett Jr. Tim L.
Cummins Engine Company, Inc.
Leedom Jr. Charles M.
Moulis Thomas N.
LandOfFree
Needle controlled fuel system with cyclic pressure generation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Needle controlled fuel system with cyclic pressure generation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Needle controlled fuel system with cyclic pressure generation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1548003