Patent ID: 7621259
Filing Date: 2009-11-24
Classification: F02D,H02M

Abstract:
1. An internal combustion engine controller, comprising: a voltage boost circuit for supplying a switching current from a battery power supply voltage to a voltage boost coil and storing, into a voltage boost capacitor through a charging diode, a high voltage generated in the boost coil when a level of the switching current is reduced; a regenerating circuit for controlling an injector current using the high voltage stored within the boost capacitor and regenerating electrical energy of an injector to said voltage boost circuit when a level of the injector current is reduced; and a discharge switching element for being provided in parallel to the charging diode; wherein, if the high voltage stored within said voltage boost circuit exceeds a required overboost compensation starting voltage, when voltage boost switching is in progress, said regenerating circuit controls that electrical energizing of said discharge switching element is suppressed, and after the voltage boost switching operation, said regenerating circuit controls that said discharge switching element is energized to discharge the high voltage into the battery power supply through the boost coil.