An injection amount variation of a plurality of fuel injection valves is reduced regardless of a state of an engine. According to one aspect of the present invention, there is provided a fuel injection control device 127 that controls a plurality of fuel injection valves having a coil for energization, including a valve body operation time detection unit 211 that detects a valve closing completion time from an end of energization of the fuel injection valve to completion of valve closing of a valve body of the fuel injection valve, a drive current correction unit 213 that corrects a drive current parameter of the fuel injection valve based on the valve closing completion time, an injection pulse width correction unit 214 that corrects an energization time of the fuel injection valve based on the valve closing completion time, and a correction method selection unit 212 that selects at least one of the drive current correction unit 213 and the injection pulse width correction unit 214 to execute correction based on a state of an engine.

A control device controls a drive current that flows through a drive coil of a fuel injection valve that is electromagnetically driven. A control device includes a determination unit configured to determine whether a supply fuel pressure, which is a pressure of fuel supplied to the fuel injection valve, is higher than a determination pressure at which the fuel pressure is determined abnormally high; a first control unit configured to control the drive current in a first mode when the determination unit determines that the supply fuel pressure is not higher than the determination pressure; and a second control unit configured to control the drive current in a second mode that facilitates maintaining of the fuel injection valve in an open state more than in the first mode when the determination unit determines that the supply fuel pressure is higher than the determination pressure.

A method for switching over a solenoid valve having a movable valve body between a first position and a second position, wherein the method comprises at least the following method steps: a) adjusting a switching current to a pre-energization current intensity, in which the valve body remains in the present position, for a first time interval, and b) adjusting the switching current to a first switchover current intensity, which introduces a switchover movement of the valve body, for a second time interval.

An electric current detection apparatus, the electric current detection apparatus is configured to detect an electric current flowing in a solenoid configured to be electrified by a PWM control, the apparatus includes a switch, an electric current value detection portion configured to detect a first electric current value at a first timing corresponding to a timing when the switch transitions from a closed state to an open state, the electric current value detection portion being configured to detect a third electric current value at a third timing, and a second electric current value calculation portion configured to calculate a second electric current value on the basis of the first electric current value and the third electric current value, the second electric current value being an electric current value of the electric current at the second timing.

Method to control an electromagnetic actuator of an internal combustion engine, in particular for a fuel pump of a direct-injection system; wherein the electromagnetic actuator is controlled by an electric current pulse of the Peak&Hold type, i.e. subdivided into a peak phase and a hold phase; the method includes acquiring the initial duration of the peak phase, during which a peak control current is to be supplied to the electromagnetic actuator to control the movement of a component of the electromagnetic actuator moving towards a position defined by a limit stop; and determining the duration of the peak phase by progressively decreasing the initial duration of the peak phase by a first change.

An injection control device includes: an area correction unit that calculates an energization time correction amount when executing a current drive of the fuel injection valve to inject a fuel from the fuel injection valve; an estimation unit that independently calculates an estimated energization time correction amount; a comparison unit that compares the energization time correction amount c with the estimated energization time correction amount; and a first abnormality determination unit that determines that the energization time correction amount is abnormal.

An injection control device includes: a boost controller charging a boost capacitor by performing a boost switching control of a boost switch, and supplying a boost power from a battery power source; and a boost voltage monitor monitors a boost voltage. The boost controller measures a number of times of when the boost voltage becomes equal to or higher than a predetermined value due to a boost current flowing into the boost capacitor, causing a jump of the boost voltage during a time between a start and stop of boosting, and determines deterioration of the boost capacitor by comparing the measured number of times (i.e., the number of jumps) with a predetermined number of times.

An injection control device includes: a boost controller performing a boost switching control of a boost switch to charge a boost capacitor and supplying a boost power from a battery power supply; a boost voltage monitor monitoring the boost voltage; and a boost monitor timing controller setting a section from a predetermined time after an on-edge of the boost switch to an off-edge timing in a section monitor mode as a boost monitor section. The boost controller stops boosting by stopping the boost switching control when the boost voltage is equal to or higher than a boost stop threshold value in the boost monitor section.

Provided is a control device for a fuel injection device capable of detecting a variation in valve opening start timing of the fuel injection device and stabilizing a fuel injection quantity. Therefore, the control device for the fuel injection device of the present invention is a control device for a plurality of fuel injection devices each including: a valve body that opens a fuel passage by separating from a valve seat; a movable element that causes an opening/closing operation of the valve body; and a stator that attracts the movable element by a drive current flowing through a coil. This control device includes a control unit that controls the energization time of the drive current by a pulse width of a drive command pulse. The control unit estimates a valve opening start timing having a correlation with a detected valve closing completion timing. Further, the pulse width of the drive command pulse is corrected based on the valve opening start timing.

Disclosed is a method for controlling a DC/DC voltage converter for controlling the current of at least one fuel injector of an internal combustion engine of a motor vehicle, the vehicle including a supply battery and the converter including a coil and a switch. The method includes the steps of measuring the value of the voltage delivered by the battery, of determining a threshold value of the current passing through the coil from the measured value of the voltage and from a predetermined curve of the current as a function of the voltage, and of actuating the opening of the switch when the current passing through the coil reaches the determined threshold value of the current in order to regulate the power of the converter.