Patent ID: 7706956

Claim:
An apparatus for driving an injector injecting fuel into an internal combustion engine, the injector being provided with a piezoelectric element to be charged and discharged, the apparatus comprising: a charger that charges the piezoelectric element in response to a command value to accumulate a desired amount of electric energy at the piezoelectric element; an acquiring unit that acquires information indicating at least a voltage applied to the piezoelectric element; a calculator that calculates the command value, wherein the calculator includes correcting means that uses the information to correct the command value by increasing the command value so as to cancel an influence of successive fuel injection carried out by the injector, when the injector injects the fuel successively a plurality of times during one air-intake stroke carried out by each cylinder of the internal combustion engine, the influence of successive fuel injection being a shortage in the electric energy to be charged at the piezoelectric element compared to the desired amount of the electric energy; and a power source circuit that drives the charger in response to the corrected command value such that the charger charges the piezoelectric element in response to the corrected command value.