Fuel injection timing control apparatus for a fuel injection pum

Details Fuel injection timing control apparatus for a fuel injection pum Fuel injection timing control apparatus for a fuel injection pum

1996-09-25

1997-12-16

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

With fuel pump

F02M 3704

Patent

active

056973470

ABSTRACT:
A target fuel injection timing of the fuel injection pump is calculated based on the operating conditions of a diesel engine (Steps 102; 302; 602), while an actual fuel injection timing is calculated based on crank angle signals (Steps 103; 303: 603). Then, a fuel injection timing error (Terr) is obtained based on a difference between the target fuel injection timing and the actual fuel injection timing (Steps 104; 304; 604). To adjust the actual fuel injection timing based on the error (Terr), a rotational position of a roller ring (10) is controlled through a timer piston (21) slidable and housed in a timer device (28) by a hydraulic pressure control valve (27) in response to a pulse actuating signal having a controllable duty ratio (DFIN). The pulse actuating signal having the controlled duty ratio is generated at a predetermined pulse output timing (Steps 208; 406; 706), so that the fuel injection caused by a force feeding stroke of the fuel injection pump is not overlapped with an actual valve-open duration of hydraulic pressure control valve (27) varying depending on the engine speed (N), thereby completely locking the timer piston (21) during the fuel injection.

REFERENCES:
patent: 4753211 (1988-06-01), Hofer
patent: 4754738 (1988-07-01), Grohn et al.
patent: 4977882 (1990-12-01), Nakamura et al.

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