Control Device for Internal Combustion Engine

The present disclosure provides a control device for an internal combustion engine which is capable of reducing an overshoot of a fuel pressure in a common rail with respect to a target pressure. A control device for the internal combustion engine includes an amount-of-injection control unit and a pressure control unit The pressure control unit includes a feedback control unit a discharge flow rate calculation unit a discharge flow rate restricting unit and an energization start angle calculation unit The feedback control unit calculates a target discharge flow rate FRt of a fuel discharged from a high-pressure fuel pump to a common rail, based on the pressure deviation ΔP between a fuel pressure Pf and a target pressure Pt. The discharge flow rate calculation unit calculates a balanced discharge flow rate FRb by increasing or decreasing the target discharge flow rate FRt such that the target discharge flow rate FRt is balanced with the flow rate of the fuel flowed out from the common rail by being injected through injectors. The discharge flow rate restricting unit outputs the restricted discharge flow rate FRr having its upper limit corresponding to the balanced discharge flow rate FRb, based on the pressure deviation ΔP. The energization start angle calculation unit calculates an energization start angle θes, which is a phase angle of the reciprocating motion of a plunger at the start of energization of the electromagnetic valve in the high-pressure fuel pump, based on the restricted discharge flow rate FRr.