Fuel injection control device for a diesel engine

摘要

Provided is a fuel injection control device which secures stability of a combustion state, and simultaneously optimizes exhaust gas characteristics for a diesel engine with a low compression ratio. The fuel injection control device for a diesel engine with a low compression ratio refers to a control map having four predetermined areas determined by a operation state of the engine, and then, selectively employs different types of fuel injection patterns accompanied by as many as twice of pilot injections. The fuel injection control device maximizes the number of conducting the pilot injections so as to prioritize restraining the combustion noise and optimizing exhaust gas characteristics when the operation states of an engine is in an area II where freedom of setting ranges for the timing of conducting the pilot injection and the main injection, and the interval of conducting the individual injections is relatively high (a low load/low rotation speed area).