Fuel supply apparatus for internal combustion engine

A fuel supply apparatus for an internal combustion engine, comprising:

• a delivery pipe for supplying a pressurized fuel to a fuel injection valve for performing fuel supply to each cylinder of the internal combustion engine;
• a high pressure fuel pump actuated by a pump driving cam driven by the internal combustion engine and for discharging the pressurized fuel to the delivery pipe;
• an electromagnetic valve for adjusting a fuel discharge amount from the high pressure fuel pump;
• a rotation position detection unit for outputting a rotation position signal of the internal combustion engine;
• a control unit for controlling the electromagnetic valve by a control signal corresponding to the rotation position signal so that the fuel discharge amount corresponds to an operation state of the internal combustion engine, and for controlling a fuel pressure in the delivery pipe;
• and
• a cam position error estimation means for estimating an attachment error of the high pressure fuel pump and the pump driving cam on the basis of a fuel pressure change position where the fuel pressure in the delivery pipe is changed by a start of fuel discharge from the high pressure fuel pump and a rotation position of the internal combustion engine obtained by the rotation position detection unit,
• wherein the control unit controls the control signal to the electromagnetic valve according to the attachment error estimated by the cam position error estimation means.