Patent ID: 8694228

Claim:
A fuel injection control apparatus for an internal combustion engine in which a voltage is applied to an electromagnetic fuel injection valve to open the electromagnetic fuel injection valve, thereby injecting fuel from the electromagnetic fuel injection valve, the fuel injection control apparatus comprising: a coil to boost a voltage of a power supply source; a first switch connected at one end to an output side of the coil and at the other end to a ground; a capacitor connected to the electromagnetic fuel injection valve to store energy which has been stored in the coil; a second switch connected at one end between the coil and the first switch and at the other end to an input side of the capacitor; and a control circuit connected to the first switch and the second switch, the control circuit being configured to perform synchronous rectifying control for switching the first switch and the second switch so that the first switch is controlled to be ON and the second switch is controlled to be OFF so as to apply a voltage of the power supply source to the coil and to store energy in the coil, and so that the first switch is controlled to be OFF and the second switch is controlled to be ON so as to supply the energy stored in the coil via the second switch to the capacitor and to store the energy in the capacitor, thereby boosting the voltage of the power supply source, the control circuit being configured to perform the synchronous rectifying control by applying, to the electromagnetic fuel injection valve, a voltage which is boosted by repeatedly performing boosting operation in which the first switch and the second switch are switched.