CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

In a diesel engine equipped with a turbocharger having a variable nozzle vane mechanism, an estimated ignition delay period Dest in pilot injection is calculated from a boost pressure PIM, an intake gas amount GCYL, an intake gas temperature TIM, a coolant temperature THW, a pilot injection time AINJP, and a pilot injection amount qpl, and a target ignition delay period Dtrg in the pilot injection is calculated from an engine speed NE and an engine load QFIN. A difference Ddif is obtained by subtracting the estimated ignition delay period Dest from the target ignition delay period Dtrg, a VN opening degree control value PVN is calculated from the difference Ddif, and the VN opening degree of the variable nozzle vane mechanism is controlled such that the estimated ignition delay period Dest matches the target ignition delay period Dtrg.