Systems and methods for improving accuracy of an amount of fuel injected to an engine are disclosed. In one example, a maximum fuel injector holding current value is adjusted from a higher value to a lower value within a predetermined amount of time of an end of fuel injection. By adjusting the maximum fuel injector holding current value, it may be possible to reduce variation in an amount of fuel that is injected via the fuel injector.

An injection control device includes a boost controller performing boost control of a boosted voltage until a boosted voltage, which is generated in a boost capacitor, rises to a full-charge threshold when the boosted voltage falls below a charge start threshold. A drive unit supplies electric current to a fuel injection valve from a start timing t1 of an injection instruction period. A power interruption controller interrupts electric current supplied to the fuel injection valve by the drive unit. A regeneration unit regenerates electric current generated in the fuel injection valve which is caused by interruption control by the power interruption controller to the boost capacitor of the booster circuit.

An injection control device includes a boost controller performing boost control of a boosted voltage generated by a booster circuit until a boosted voltage, which is generated in a boost capacitor, rises to a full-charge threshold when the boosted voltage falls below a charge start threshold. When, for stopping a peak current by a drive unit, a power interruption controller interrupts electric current supplied to the fuel injection valve by the drive unit as interruption control (i) of an application voltage to a fuel injection valve or (ii) of a constant current by the drive unit, a regeneration unit regenerates electric current generated in the fuel injection valve to the boost capacitor of the booster circuit. The boost controller upward-shifts (i.e., raises) the full-charge threshold of the booster circuit.

Systems and methods for improving accuracy of an amount of fuel injected to an engine are disclosed. In one example, a maximum fuel injector holding current value is adjusted from a higher value to a lower value within a predetermined amount of time of an end of fuel injection. By adjusting the maximum fuel injector holding current value, it may be possible to reduce variation in an amount of fuel that is injected via the fuel injector.

A method for identifying a type of a fuel injector installed in an internal combustion engine includes generating a control signal to supply electrical energy from a power source for actuating the fuel injector, monitoring the electrical energy, identifying a pattern in the electrical energy, the pattern being indicative of the type of the fuel injector, and outputting a notification indicative of an incorrect injector type based on the pattern.

An injection control device includes a boost controller performing boost control of a boosted voltage generated by a booster circuit until a boosted voltage, which is generated in a boost capacitor, rises to a full-charge threshold when the boosted voltage falls below a charge start threshold. When a power interruption controller interrupts electric current supplied to the fuel injection valve by the drive unit, a regeneration unit regenerates electric current generated in the fuel injection valve to the boost capacitor of the booster circuit. The boost controller stops the boost control of the booster circuit when at least the electric current is regenerated by the regeneration unit to the boost capacitor of the booster circuit after the interruption control by the power interruption controller.

An injection control device includes a boost controller performing boost control of a boosted voltage generated by a booster circuit until a boosted voltage, which is generated in a boost capacitor, rises to a full-charge threshold when the boosted voltage falls below a charge start threshold. When, for stopping a peak current by a drive unit, a power interruption controller interrupts electric current supplied to the fuel injection valve by the drive unit as interruption control (i) of an application voltage to a fuel injection valve or (ii) of a constant current by the drive unit, a regeneration unit regenerates electric current generated in the fuel injection valve to the boost capacitor of the booster circuit. The boost controller upward-shifts (i.e., raises) the full-charge threshold of the booster circuit.

An injection control device includes a boost controller performing boost control of a boosted voltage until a boosted voltage, which is generated in a boost capacitor, rises to a full-charge threshold when the boosted voltage falls below a charge start threshold. A drive unit supplies electric current to a fuel injection valve from a start timing t1 of an injection instruction period. A power interruption controller interrupts electric current supplied to the fuel injection valve by the drive unit. A regeneration unit regenerates electric current generated in the fuel injection valve which is caused by interruption control by the power interruption controller to the boost capacitor of the booster circuit.

Various embodiments includes a method for determining energization data for an actuator of an injection valve of a motor vehicle comprising: receiving input data at a control unit; and determining the energization data based on the received input data into account with the control unit. Determining the energization data includes using a polynomial regression model.

A method of injecting fuel with a fuel injector includes applying a spill valve current to close a spill valve and applying a control valve current to move a control valve to an injection position. The method also includes discontinuing the application of the spill valve current to open the spill valve and preventing a return of the control valve to a non-injection position while detecting a timing when the spill valve opens.