Patent ID: 7124740
Filing Date: 2006-10-24
Classification: F02D

Abstract:
1. A fuel injection control device for an internal combustion engine, the internal combustion engine being a direct injection internal combustion engine, comprising: a feedback control unit that performs feedback control of a discharge amount of a high pressure fuel pump such that an actual fuel pressure becomes a target fuel pressure, the feedback control using a control operation including an integral term; an integral term update control unit that stops updating of the integral term of the feedback control when a deviation of the target fuel pressure and the actual fuel pressure is equal to or more than a predetermined value; and a calculation unit that calculates a pump duty that is a controlled variable of the feedback control of the high pressure fuel pump based upon the deviation of the target fuel pressure and the actual fuel pressure, wherein after the integral term update determination control unit determines that the deviation between the target fuel pressure and the actual fuel pressure is equal to or more than the predetermined value, the integral term update determination control unit returns to updating of the integral term of the feedback control after completion of fuel discharge by the high pressure fuel pump in accordance with the pump duty calculated by the calculation unit.