公开(公告)号：US09714626B2

公开(公告)日：2017-07-25

申请号：US14766253

申请日：2014-01-24

Applicant: Hitachi Automotive Systems, Ltd.

Inventor： Ayumu Hatanaka ,  Ryo Kusakabe ,  Motoyuki Abe ,  Toshihiro Aono ,  Teppei Hirotsu ,  Hideyuki Sakamoto ,  Takao Fukuda ,  Hideharu Ehara ,  Masahiro Toyohara ,  Akira Nishioka ,  Toshio Hori ,  Kiyoshi Aiki

IPC: F02M51/06 ,  F02D41/20 ,  F02D41/34 ,  F02M51/00 ,  F02M61/10 ,  F16K31/06 ,  F02D41/40 ,  F02D41/30 ,  F02M63/00

CPC classification number: F02D41/401 ,  F02D41/20 ,  F02D41/3011 ,  F02D2041/2006 ,  F02D2041/2055 ,  F02D2041/2058 ,  F02M51/061 ,  F02M63/0017

Abstract: An object of this disclosure is to provide a fuel injection device that can reliably detect an operation timing of a valve body, that is, a valve opening timing with high accuracy. The current of an electromagnetic valve reaches I2 at time t3, an FET 201 and an FET 221 are turned on, and a battery voltage VB is applied to the electromagnetic valve until time t5 is reached. The amount of displacement of the valve body reaches a target amount of control lift at time t4 between time t3 and time t5, that is, a movable core 304 comes into contact with a fixed core 301. The detection of the valve opening timing is performed during the period from time t3 to time t5.

公开(公告)号：US10002699B2

公开(公告)日：2018-06-19

申请号：US14785528

申请日：2013-04-25

Applicant: Hitachi Automotive Systems, Ltd.

Inventor： Kiyoshi Aiki ,  Ayumu Hatanaka ,  Takuya Mayuzumi ,  Katsuya Oyama ,  Ryosuke Ishida ,  Yasushi Sugiyama

IPC: H01F7/20 ,  H02M1/44 ,  H02M3/155 ,  H03K17/16 ,  F02D41/20 ,  F02D41/00

CPC classification number: H01F7/204 ,  F02D41/20 ,  F02D2041/001 ,  F02D2041/2041 ,  H02M1/44 ,  H02M3/155 ,  H02M2003/1555 ,  H03K17/162

Abstract: The present invention is to provide a magnet coil drive control device that can efficiently suppress conduction noise while reducing the capacitance of a capacitor. A capacitor and an impedance element are arranged in series on the connecting line connecting the positive electrode line and the negative electrode line of a DC power supply, the connecting line between the capacitor and the impedance element is connected to one end of a magnet coil via a freewheeling diode, and the portion between the freewheeling diode and the one end of the magnet coil is connected to the positive electrode line or the negative electrode line by a switching element. Conduction noise caused by the driving current of the magnet coil can be suppressed by the impedance element, and the capacitance of the capacitor can be further reduced. Accordingly, the magnet coil drive control device can be made smaller in size.