Hitachi Automotive Systems, Ltd.

Kiyoshi Aiki

Ayumu Hatanaka

Hideyuki Sakamoto

Motoyuki Abe

Toshio Hori

Teppei Hirotsu

Takuya Mayuzumi

Masahiro Toyohara

Ryo Kusakabe

Toshihiro Aono

Akira Nishioka

Katsuya Oyama

Hideharu Ehara

Takao Fukuda

Yasushi Sugiyama

Ryosuke Ishida

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.

Electromagnetic coil driving control device

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 Iat time t, an FETand an FETare turned on, and a battery voltage VB is applied to the electromagnetic valve until time tis reached. The amount of displacement of the valve body reaches a target amount of control lift at time tbetween time tand time t, that is, a movable corecomes into contact with a fixed core. The detection of the valve opening timing is performed during the period from time tto time t

Drive device for fuel injection device

Growing community of inventors

Tokyo, Japan

Kiyoshi Aiki