An injection control device includes: a drive control unit that controls energization by correcting an energization instruction time when injecting the fuel by executing the current-drive, and includes an energization time correction amount calculation unit that calculates an energization time correction amount by performing area correction on a current flowing through the fuel injection valve; an abnormality determination unit that determines an abnormality in a control system of the drive control unit; and a correction amount subtraction setting unit that stops a calculation of the energization time correction amount when the abnormality determination unit determines an abnormality, and controls the drive control unit to directly or stepwise reduce the energization time correction amount at an abnormality determination.

An injection control device of capable of correcting an energization time even in an S/N non-guaranteeable situation includes: an energization controller calculating an energization time correction amount based on an area correction performed by an energization time correction amount calculator regarding electric current flowing in a fuel injection valve when the fuel injection valve is electrically driven for injecting fuel; and an energization instruction time calculator correcting an energization instruction time for fuel injection in a next cycle and thereafter by using the energization instruction time correction amounts in or before a current cycle.

A fuel injection control device for an internal combustion engine which is applied to a fuel injection system of the internal combustion engine, the fuel injection system including fuel injectors, driving circuits that drive the fuel injectors in each of driving systems into which the fuel injectors are divided, and current detection circuits that are provided to the driving systems, respectively, and the current detection circuits that sense driving currents of corresponding fuel injectors. The fuel injection control device includes an acquisition unit to acquire a current change parameter that is a parameter correlative to a change quantity of a sensed current per unit time in each of the driving systems, and a current correction unit to execute a current correction in at least one of the driving systems based on the current change parameter in each of the driving systems.

An injection control device for a fuel injection valve includes: a current detection unit of the fuel injection valve; a current area correction control unit that performs current area correction for an area correction amount of an energization time to equalize the integrated current value of the energization current profile and an integrated current value of the detected current; and an information correction unit that learns and stores a reference attainment time, from a start of energization to an attainment of each of the plurality of reference currents, in a storage unit, and corrects information related to the current area correction based on a difference between the reference attainment time and an actual attainment time from the start of energization to the attainment of each reference current.

An injection control device includes: a drive control unit that controls energization by correcting an energization instruction time when injecting the fuel by executing the current-drive, and includes an energization time correction amount calculation unit that calculates an energization time correction amount by performing area correction on a current flowing through the fuel injection valve; an abnormality determination unit that determines an abnormality in a control system of the drive control unit; and a correction amount subtraction setting unit that stops a calculation of the energization time correction amount when the abnormality determination unit determines an abnormality, and controls the drive control unit to directly or stepwise reduce the energization time correction amount at an abnormality determination.

An injection control device for a fuel injection valve includes: a current detection unit; and a current area correction control unit that corrects, based on an energization current profile, an area correction amount of an energization time to equalize the integrated current value of the energization current profile and an integrated current value of the detected current, and obtains the integrated current value of the current based on an attainment time from a start of energization of the fuel injection valve to an attainment of each of a plurality of reference current values; a storage unit that stores a reference attainment time; and a reference current value correction unit that corrects each reference current value based on a difference between the reference attainment time and a detected attainment time at a time of actual drive.

An injection control device includes: a fuel injection quantity command value output unit that outputs a command value for a fuel injection quantity of a fuel injection valve; and a controller that executes current control on the fuel injection valve. The controller executes current area correction by calculating an area correction amount for an energization time to cause an integrated current value of an energization current profile and the integrated current value of a current to be equal to each other. Correction control of the current area correction is changed based on a detection signal of a cooling water temperature of an internal combustion engine.

An injection control device includes: a fuel injection quantity command value output unit that outputs a command value for a fuel injection quantity of the fuel injection valve; a fuel injection quantity correction unit that calculates an A/F correction amount and corrects the command value of the fuel injection quantity; and a controller that executes current control on the fuel injection valve. The controller executes current area correction. The injection control device further includes an area correction abnormality determination unit that determines an area correction abnormality. The area correction abnormality determination unit changes the abnormality determination value.

An injection control device controls the opening and closing of a fuel injection valve by performing peak current drive and constant current drive with respect to the fuel injection valve and controls injection of fuel from the fuel injection valve to an internal combustion engine. The injection control device includes an energization control unit that performs constant current switching control of an energization current to the fuel injection valve. The energization control unit is configured to, when the energization current to the fuel injection valve is to be stopped, controls an energization stop timing of the energization current such that a flyback period is equal to a first predetermined time period.

Systems and methods for improving accuracy of an amount of fuel injected to an engine are disclosed. In one example, holding current of a fuel injector is adjusted to follow a fixed period and timing of a fuel injector off command is adjusted according to attributes of fuel injector holding current so that a fuel injector may provide a requested fuel amount. The fuel injector off command may be adjusted according to an amount of holding current that is expected to be flowing through the fuel injector at a time when the fuel injector is commanded off.