Hitachi Automotive Systems, Ltd.

Hitachi Astemo Ltd.

Takatoshi Iizuka

Takao Miyake

Kiyotaka Ogura

Masashi Sugaya

Akiyasu Miyamoto

Motoyuki Abe

Yoshihito Yasukawa

Ryo Kusakabe

Shirou Yamaoka

A fuel injection device includes a nozzle holder; a fixed core; an anchor; and a valve member. The valve member has a plunger rod and a spacer. The plunger rod is provided with a shaft portion, and an engaging portion that engages with the anchor during a valve opening operation. The spacer has an accommodating portion in which the engaging portion is accommodated and forms a predetermined gap between the engaging portion and the anchor when the valve is closed. Further, the accommodating portion and the engaging portion are in line contact or point contact.

Fuel injection device

An object is to suppress an inclination of a waveform indicating an injection quantity with respect to an injection pulse particularly when a lift amount of a valve body is small and an injection pulse width is short, thereby improving control accuracy of the injection quantity of a fuel injection device. Thus, a control device for controlling a fuel injection device, which includes a valve body, a solenoid, and a movable element to open the valve body, is provided with a control unit that controls a drive voltage or a drive current to be applied to the solenoid, in which the control unit controls the drive current such that the drive current to be supplied to the solenoid decreases from a maximum drive current after the maximum drive current is supplied to the solenoid and before the valve body starts to open.

Control device for fuel injection device

The purpose of the present invention is to provide a drive device that improves the precision of injection quantities by stabilizing the behavior of a valve bodyunder the condition that a valve body reaches a height position lower than a maximum height position and making the injection pulse width and the injection quantity gradient small. The present invention is a drive device for a fuel injection device for use in an internal combustion engine, wherein: the fuel injection device is provided with a valve bodythat can open and close a fuel passage, a needlethat activates an opening and closing valve by transmitting power between itself and the valve body, and an electromagnet that comprises a solenoidand a fixed coreprovided as drive means for the needle, and a cylindrical nozzle holderdisposed on the outer peripheral side of the needle; and the drive devicecontrols a drive current flowing to the coil so as to decrease from the maximum drive current to a first drive currentthat is lower than the maximum drive current before the valve bodyreaches the maximum height position so that the valve bodyreaches a height position lower than the maximum height position.

Drive device for fuel injection device

A solenoid valve provided with a valve element that abuts against and separates from a valve seat to seal fuel; a movable iron core capable of being separated from the valve element; and a fixed iron core arranged opposed to the movable iron core. The solenoid valve also includes: a first spring member that energizes the valve element toward a side of the valve seat; a second spring member that energizes the movable iron core toward the fixed iron core; and a stopper part disposed on the side of the valve seat with respect to the movable iron core, and arranged with the movable iron core via a gap in a displacement direction in a valve closed state. The gap is set so the movable iron core collides with the stopper part when being displaced in the valve closing direction after the valve element is opened.

Growing community of inventors

Hitachinaka, Japan

Takatoshi Iizuka