Abstract: An electromagnetic valve drive device, that drives a fuel injection valve having a solenoid coil, includes a drive unit configured to drive the solenoid coil, an energization control unit configured to control energization for the solenoid coil by controlling the drive unit, a processing unit configured to obtain a current value arrival time, which is a time having elapsed from a start of energization for the solenoid coil until a current flowing through the solenoid coil reaches a predetermined current value, and an estimation unit configured to estimate a valve opening start time, which is a time from the start of the energization to a start of opening of the fuel injection valve on the basis of the current value arrival time.

Abstract: An electromagnetic valve drive device, that drives a fuel injection valve having a solenoid coil, includes a drive unit configured to drive the solenoid coil, an energization control unit configured to control energization for the solenoid coil by controlling the drive unit, a processing unit configured to obtain a current value arrival time, which is a time having elapsed from a start of energization for the solenoid coil until a current flowing through the solenoid coil reaches a predetermined current value, and an estimation unit configured to estimate a valve opening start time, which is a time from the start of the energization to a start of opening of the fuel injection valve on the basis of the current value arrival time.

Abstract: A fuel injection valve includes a valve seat member, and an injector plate which is coupled to a front end face of the valve seat member and has a plurality of fuel injection orifices disposed about an axis of the valve seat member to communicate with a valve seat. Swirling means for swirling a fuel injected from each of the fuel injection orifices is provided in at least one of the valve seat member and the injector plate. The plurality of fuel injection orifices are disposed so that liquid membrane portions of adjoining hollow conical fuel spray forms formed by the fuel injected from the fuel injection orifices collide with one another. Thus, the atomization of the injected fuel can be further promoted, and a coalesced fuel spray form having a fuel particle density higher in a central zone and lower in an outer peripheral zone can be formed.

Abstract: A fuel injection valve includes a valve seat member, and an injector plate which is coupled to a front end face of the valve seat member and has a plurality of fuel injection orifices disposed about an axis of the valve seat member to communicate with a valve seat. Swirling means for swirling a fuel injected from each of the fuel injection orifices is provided in at least one of the valve seat member and the injector plate. The plurality of fuel injection orifices are disposed so that liquid membrane portions of adjoining hollow conical fuel spray forms formed by the fuel injected from the fuel injection orifices collide with one another. Thus, the atomization of the injected fuel can be further promoted, and a coalesced fuel spray form having a fuel particle density higher in a central zone and lower in an outer peripheral zone can be formed.