Keihin Corporation

Tadao Tsuchiya

Hidetaka Ozawa

Kazuhito Kakimoto

Yasuharu Hourai

Tsukasa Naganuma

Manabu Shoji

Manabu Shouji

Kenichi Omori

Koji Sonoda

To provide a fuel injection device for controlling a fuel injection valve including a solenoid and a magnetostrictive element to generate a drive force for driving the fuel injection valve, the fuel injection device including: a solenoid power source () for driving the solenoid, a solenoid drive circuit () adapted to control the electrification to the solenoid by the solenoid power source (), a plurality of magnetostrictive element driving power sources () for driving the magnetostrictive element, and a magnetostrictive element drive circuit () adapted to control the electrification to a magnetostrictive coil of the magnetostrictive element by the magnetostrictive element driving power sources. Since the plurality of the magnetostrictive element driving power sources can be respectively used when performing a valve-opening operation and when performing a valve-closing operation of the fuel injection valve of the fuel injection device, the opening/closing operation of the fuel injection valve of the fuel injection device can be properly performed.

Fuel injection device, fuel injection control device, and control method of fuel injection device

A fuel injection valve is provided that includes an electromagnetic actuator (A) that moves a valve body () in an inwardly-opening direction, and a magnetostrictive actuator (A) that, by passing current therethrough, elongates a movable part assembly () extending from the valve body () to a movable core () of the electromagnetic actuator (A), wherein the magnetostrictive actuator (A) is formed from a solid magnetostrictive element () provided between the valve body () and the movable core () of the electromagnetic actuator (A) so as to couple the valve body () and the movable core (), a preload spring () provided between the valve body () and the movable core () so as to apply a compressive preload in the axial direction of the valve body () to the magnetostrictive element (), and a second coil () mounted on a valve housing (H) housing the valve body (), the movable core (), the magnetostrictive element (), and the preload spring (), the second coil () elongating the magnetostrictive element () against the preload by the passage of current. By combining in this way the electromagnetic actuator and the magnetostrictive actuator equipped with the solid magnetostrictive element, a fuel injection valve of an inwardly-opening type that has good responsiveness and is capable of operating at low power consumption can be provided.

Fuel injection valve

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Miyagi, Japan

Tadao Tsuchiya