Verbrennungssteuerapparat für einen Dieselmotor, Dieselmotor, Verbrennungssteuerverfahren dafür, Speichermedium und Computerprogramm

摘要

To suppress deposition of fuel injected at an early timing on a wall surface for preventing the degradation in fuel efficiency and the increase in the amount of harmful components in exhaust gas, in a direct-injection diesel engine which controls the injector 5 to inject fuel at a timing within a predetermined crank angle range in the compression stroke of the cylinder 2 so as to cause a combustion configuration dominated by the compressive ignition of the premixture while the engine is in the premixed combustion region (H) defined on a low load side. When fuel is injected at an early timing to form premixture, at least one of the pulse width PWL (the valve opening duration) to be inputted into the injector 5 and the fuel-pressure PRA is or are adjusted according to the change in the injection timing IT(n) of the injector 5 (SA5), and corrected according to the intake air temperature tha or the intake pressure bo (SA 6 or 7). If an allowable pulse width PWL is insufficient to inject fuel in the amount corresponding to a target torque Trq, fuel is injected in a divided manner with a plurality of shots (SA9 to SA11).