Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1996-05-20
1998-04-21
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Fuel injection system
123447, 123506, 239 89, 137853, F02M 3704, F02M 4702, F16K 1514
Patent
active
057407827
ABSTRACT:
An improved, full-authority, digital-electronic-controlled cylinder fuel injection system for internal combustion engines is conceived that utilizes positive displacement metering and electrohydraulic actuation with pressure amplification, positive feedback control and self cooling. The injectors operate from a relatively low pressure common rail fuel supply that may be fed by either pumping or from a pressurized fuel tank. The injectors incorporate self cooling passages that enable continuous operation independent of engine cooling, if any. The injectors comprise a stepped piston freely oscillating in a cylindrical housing providing an actuation chamber at the large end and a metering cup and injection nozzles at the other. A third chamber is provided in between for handling a degree of piston leakage and ullage. Charging, metering, timing and injection functions are controlled by a cartridge-type, 3-way, electrically-actuated valve that may be manifolded with the injector as a unit or mounted separately and connected externally. An outward-opening, variable-area injector nozzle is used for improved injection quality and turndown characteristics with a reduced level and range of injection pressures.
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Canter Bruce
Moulis Thomas N.
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