Nippon Soken, Inc.

Huminori Suzuki

Yasuyuki Sakakibara

Moriyasu Gotoh

Shigeiku Enomoto

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.

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Nishio, Japan

Huminori Suzuki