Patent ID: 6532940
Filing Date: 2003-03-18
Classification: F02D

Abstract:
A fuel injection control system for a cylinder injection type internal combustion engine, comprising:an electromagnetic fuel injection valve for injecting fuel directly into an engine cylinder; means for outputting an overexcitation current for opening said fuel injection valve from a vehicle-onboard power supply unit mounted on a motor vehicle equipped with said cylinder injection type internal combustion engine to said fuel injection valve during a predetermined overexcitation time duration conforming to a power supply voltage of said power supply unit; means for outputting a holding current smaller than said overexcitation current from said vehicle-onboard power supply unit to said fuel injection valve for holding said fuel injection valve in a valve open state; means for changing over output operation of said overexcitation drive means with output operation of said outputting means to thereby control driving operation for said fuel injection valve; means for detecting the output voltage of said power supply unit; and means for changing a time point for switching the output operation of said overexcitation drive means to the output operation of said outputting means for said fuel injection valve control means in dependence on the voltage detected by said voltage detecting means.