Abstract: A drive current applied to a coil is reduced from a time at which a first collision signal indicating collision of a movable core with a valve element is input to a time at which a second collision signal indicating collision of the movable core with a stationary core is input.

Abstract: An electromagnetic fuel injection valve wherein a movable core disposed opposing an attracting face of a fixed core is slidably fitted onto a stem forming a valve body together with a valve part operating in cooperation with a valve seat, a valve-open side stopper is fixed to the stem so that, by making the movable core, that is attracted to the face when energizing a coil, abut against this stopper, the body is operated to open, and a valve-closed side stopper is fixed to the stem further on the seat side than the other stopper so as to restrict a stroke of the movable core between these stoppers. At least an end part of one of the valve-closed side stopper and the movable core, the end part being on a side of the other one thereof, is formed to gradually decreasing its cross-sectional area in going toward the other one.

Abstract: A fuel injection control apparatus is provided with a first valve opening timing determination portion that determines a first valve opening timing on the basis of a collision signal that is included in detected signals of an in-cylinder pressure sensor and indicates a collision between a movable core and a valve element and a second valve opening timing determination portion that determines a second valve opening timing on the basis of another collision signal that is included in the detected signals and indicates a collision between the movable core and a stationary core.

Abstract: An electromagnetic fuel injection valve wherein a movable core disposed opposing an attracting face of a fixed core is slidably fitted onto a stem forming a valve body together with a valve part operating in cooperation with a valve seat, a valve-open side stopper is fixed to the stem so that, by making the movable core, that is attracted to the face when energizing a coil, abut against this stopper, the body is operated to open, and a valve-closed side stopper is fixed to the stem further on the seat side than the other stopper so as to restrict a stroke of the movable core between these stoppers. At least an end part of one of the valve-closed side stopper and the movable core, the end part being on a side of the other one thereof, is formed to gradually decreasing its cross-sectional area in going toward the other one.

Abstract: A fuel injection control apparatus is provided with a first valve opening timing determination portion that determines a first valve opening timing on the basis of a collision signal that is included in detected signals of an in-cylinder pressure sensor and indicates a collision between a movable core and a valve element and a second valve opening timing determination portion that determines a second valve opening timing on the basis of another collision signal that is included in the detected signals and indicates a collision between the movable core and a stationary core.

Abstract: A drive current applied to a coil is reduced from a time at which a first collision signal indicating collision of a movable core with a valve element is input to a time at which a second collision signal indicating collision of the movable core with a stationary core is input.

Abstract: A control device includes a difference calculating unit configured to generate a difference waveform composed of the difference between a normal operation waveform, which is a voltage waveform of the fuel injection valve at a time that the fuel injection valve is operating, and a non-operation waveform, which is a voltage waveform of the fuel injection valve at a time that the fuel injection valve is not operating, a derivative calculating unit configured to generate a differentiated waveform obtained by differentiating the difference waveform, and an operating state determining unit configured to determine the operating state of the fuel injection valve based on the differentiated waveform.