Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1996-08-07
1997-11-11
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Fuel injection system
123467, 123506, 239 96, F02M 4100
Patent
active
056852738
ABSTRACT:
Fuel delivery to an engine from a cyclically pressurizable, electronically controlled accumulator-type fuel injector is controlled by "wasting" at least a portion of the pressurization stroke of the engine's high pressure pump so that a designated portion of the pressurization stroke of the pump does not result in accumulator cavity pressurization. Metering is effected simply by extending the period that the system's existing solenoid vent valve is open into a portion of the succeeding pressurization stroke of the pump so that a portion of the pumped fuel flows directly to vent. Additional electrical load on the engine can be minimized by using a latching type solenoid valve as the vent valve. The metering scheme 1) is more precise than metering schemes heretofore available for injectors of the disclosed type, 2) does not adversely effect injection timing or other injection parameters, 3) and requires no additional hardware.
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Beck Niels J.
Johnson William P.
Pena James A.
BKM, Inc.
Moulis Thomas N.
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