Patent ID: 8280613

Claim:
A fuel injection control apparatus for injecting fuel directly into a combustion chamber of an internal combustion engine, comprising a fuel injector which performs fuel injection by supplying a drive current to a solenoid, a fuel pressure sensor which detects fuel pressure supplied to the fuel injector, and operation state detecting means which detects an operation state of the internal combustion engine, the fuel injection control apparatus for the internal combustion engine, comprising: current profile changing means which has multiple current profiles of the drive current and changes the current profiles based on the operation state and the fuel pressure; valid pulse width calculating means which calculates a valid pulse width corresponding to a fuel injection quantity for opening and driving the fuel injector, based on the operation state and the fuel pressure; invalid pulse width calculating means which calculates an invalid pulse width corresponding to valve opening delay and valve closing delay of the fuel injector, based on the fuel pressure; and fuel injector control means which calculates a fuel injection pulse width based on the valid pulse width and the invalid pulse width, and controls the fuel injector based on the fuel injection pulse width, wherein the invalid pulse width calculating means calculates an invalid pulse width corresponding to the current profiles to be changed before the current profiles are changed.