Hitachi Astemo Ltd.

Hitachi Automotive Systems, Ltd.

Takuya Watai

Takao Miyake

Masashi Sugaya

Yasuo Namaizawa

Akiyasu Miyamoto

Taisuke Sugii

Ryo Kusakabe

Osamu Mukaihara

Kiyotaka Ogura

Fumihiro Itaba

Shirou Yamaoka

A fuel injection device includes a nozzle element, an injection hole forming member, and a valve element. The injection hole forming member includes a seat part having the seat surface, and a suck chamber formed on a front end part of the seat part, the suck chamber being a recess denting in the direction of heading from the seat surface toward a front end part. The suck chamber has a suck chamber injection hole from which a fuel is jetted toward the ignition plug.

Fuel injection device

An injection amount variation of a plurality of fuel injection valves is reduced regardless of a state of an engine. According to one aspect of the present invention, there is provided a fuel injection control devicethat controls a plurality of fuel injection valves having a coil for energization, including a valve body operation time detection unitthat detects a valve closing completion time from an end of energization of the fuel injection valve to completion of valve closing of a valve body of the fuel injection valve, a drive current correction unitthat corrects a drive current parameter of the fuel injection valve based on the valve closing completion time, an injection pulse width correction unitthat corrects an energization time of the fuel injection valve based on the valve closing completion time, and a correction method selection unitthat selects at least one of the drive current correction unitand the injection pulse width correction unitto execute correction based on a state of an engine.

Fuel injection control device

To provide a fuel injection device capable of improving waterproof performance of the coil portion. A fuel injection deviceincludes a coil bobbindisposed in a housingand having a bobbin outer peripheral surfacethat holds a coiland a bobbin inner peripheral surfacethat is a surface on an opposite side of the bobbin outer peripheral surface, and a first outer peripheral surfaceand a first outer peripheral surface(guide portion) that come into contact with the bobbin inner peripheral surface. A first space Sand a second space S(internal space) are formed by the first outer peripheral surfaceand the first outer peripheral surface, and the bobbin inner peripheral surface, and the first space Sand the second space Scommunicate with a space filled with the connecting portion

Provided is a fuel injection valve capable of stroking a valve body in two stages of large and small strokes and improving responsiveness of a valve opening operation. Therefore, a first moveris attracted to a magnetic core. A second moveris formed separately from the first mover, and is attracted to the magnetic coreon an inner diameter side of the first mover. A valve bodyhas a flange portionon an upstream side of the second mover. A spacerforms a gap (void g) in an axial direction between the flange portionand the second moverin a valve closed state.

Fuel injection valve and method for assembling same

Provided is a fuel injection valve capable of quickly stopping a position of a movable element at a predetermined position after closing a valve while reducing an impact force of a valve body. Therefore, a valve bodyincludes a sleeve. A first movable core(first movable element) lifts the valve bodyby the attractive force of a magnetic core. A second movable core(second movable element) further lifts the valve bodyby the attractive force of the magnetic coreafter the first movable core(first movable element) lifts the valve body. After the valve bodyis seated on the seat memberand the second movable core(second movable element) is separated from the sleeve, a bottom surfaceof the first movable core(first movable element) collides with a storage bottom surface(collision receiving portion).

Fuel injection valve

A fuel injection device is provided with reduced adherence of fuel spray with respect to an intake valve, a wall surface in an engine cylinder, or a piston. The fuel injection device includes a valve body and a seat surface to perform sealing of fuel cooperatively and injection holes. Inlet opening surfaces are formed on the seat surface. A first injection hole and a second injection hole arranged closest to the first injection hole. The first injection hole is larger than the second injection hole in an injection hole angle to be an angle formed by a normal direction of the seat surface and a center axis of the injection hole. The second injection hole is larger than the first injection hole in an area of a cross-section perpendicular to the center axis of the injection hole.

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Hitachinaka, Japan

Takuya Watai