Patent ID: 7487760

Claim:
A fuel supply apparatus for an internal combustion engine, comprising: a fuel pump driven by said engine; pressure accumulating means for retaining fuel pressurized by said fuel pump; relief means for opening when a fuel pressure in said pressure accumulating means exceeds a predetermined upper limit pressure; injection means connected to said pressure accumulating means for injecting fuel into a combustion chamber of said engine; fuel pressure detecting means for detecting said fuel pressure in said pressure accumulating means; basic target fuel pressure calculating means for calculating a basic target fuel pressure according to an operating condition of said engine; and fuel pressure control means for controlling a discharge amount of said fuel pump so that the detected fuel pressure coincides with a target fuel pressure, wherein said fuel pressure control means reduces the target fuel pressure when the detected fuel pressure is equal to or greater than a first predetermined fuel pressure, to suppress opening of said relief means, wherein said fuel pressure control means sets the target fuel pressure to the basic target fuel pressure when the detected fuel pressure is lower than the first predetermined fuel pressure, and sets the target fuel pressure to a value obtained by subtracting a predetermined value from the basic target fuel pressure when the detected fuel pressure is equal to or greater than the first predetermined fuel pressure.