公开(公告)号：US20250137415A1

公开(公告)日：2025-05-01

申请号：US18836144

申请日：2022-03-03

Applicant: Hitachi Astemo, Ltd.

Inventor： Daichi KAWAKAMI ,  Noriaki SUMISHA ,  Junpei KOGAWA

IPC: F02D41/24 ,  F02D41/20 ,  F02M51/06

Abstract: An electromagnetic valve driving device that controls an energization period to a solenoid coil provided in a fuel injection valve and causes the fuel injection valve to inject fuel a plurality of times during one combustion cycle of an internal combustion engine, the electromagnetic valve driving device includes: a storage that stores a correction amount map indicating a relationship between an energization pause period from a completion time of a first-half energization period, which is the energization period for a first fuel injection in the one combustion cycle, to a start time of a later-half energization period, which is the energization period for next fuel injection, and a correction amount for the later-half energization period; an energization period correction unit that obtains the correction amount from a command value of the energization pause period based on the correction amount map and corrects the later-half energization period based on the obtained correction amount; and an energization controller that energizes the solenoid coil based on a later-half correction energization period that is the later-half energization period corrected by the energization period correction unit.

公开(公告)号：US20220298996A1

公开(公告)日：2022-09-22

申请号：US17545328

申请日：2021-12-08

Applicant: HITACHI ASTEMO, LTD.

Inventor： Yuya SUZUKI ,  Norihide OUCHI ,  Nozomu SASAKI ,  Junpei KOGAWA ,  Sho KANDA

IPC: F02M51/06

Abstract: In an electromagnetic fuel injection valve, a plurality of recess parts are provided in an attracted face of a movable core, the recess parts dividing a taper face of the movable core into a plurality of sections along a peripheral direction of the movable core. Accordingly, a fuel oil film present in an engaged part between an annular projection of a fixed core and the taper face is sectioned at a plurality of locations, thereby suppressing a sticking phenomenon of the engaged part caused by the fuel oil film. Therefore, when energization of a coil is cut off, a delay in detachment of the movable core from the fixed core is eliminated, thus contributing to improvement of valve-closing responsiveness.