HIGH-PRESSURE FUEL FEEDING DEVICE OF INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To enable a fuel required for an engine operation to unfailingly be injected even if a dysfunction of a high-pressure pump causes a relief valve to repeat opening and closing actions.SOLUTION: When the dysfunction of the high-pressure pump 14 causes the relief valve 26 to repeat opening and closing actions (that is to say, a pulsed condition has been caused in which the fuel pressure inside a high-pressure fuel passage fluctuates up and down in the vicinity of relief pressure), the injection timing of a fuel injection valve 23 is set at a timing (e.g., a fuel pressure bottom position) in which the fuel pressure inside the high-pressure fuel passage falls within an allowable range of fuel injection. Specifically, a fuel pressure bottom position is estimated based on an engine revolution speed and a phase of a camshaft (a rotational phase of the camshaft 17 in relation to a crankshaft) to learn the fuel pressure bottom position based on a fuel pressure detection signal of a fuel pressure sensor 24 and then a final fuel pressure bottom position is calculated based on these estimated and learnt values of the fuel pressure bottom position. As a result, this final fuel pressure bottom position is set as a fuel injection start timing of the fuel injection valve 23.