Electronic control for a hydraulic-actuator unit injector fuel s

Internal-combustion engines – Charge forming device – Fuel injection system

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123500, F02M 700

Patent

active

055643914

ABSTRACT:
An apparatus and method for sampling the pressure of a hydraulic actuator fluid used in connection with an electronically controlled hydraulic actuator unit injector fuel system is disclosed. The apparatus and method eliminates aliasing and other sampling errors caused by oscillations in the hydraulic actuator fluid pressure. The apparatus and method senses an engine parameter to permit an electronic controller to calculate an injection time and duration for fuel to be delivered to a particular cylinder. The electronic controller issues a driver signal to a hydraulically actuated unit fuel injector. A hydraulic actuator fluid pressure sensor is associated with the pressurized hydraulic actuator fluid. The electronic controller samples the hydraulic actuator fluid pressure sensor in dependence on the issuance of the driver signal.

REFERENCES:
patent: 4248194 (1981-02-01), Drutchas
patent: 4825373 (1989-04-01), Nakamura
patent: 4982331 (1991-01-01), Miyazaki
patent: 5168855 (1992-12-01), Stone
patent: 5181494 (1993-01-01), Ausman
patent: 5191867 (1993-03-01), Glassey

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