Hitachi, Ltd.

Hitachi Automotive Systems, Ltd.

Hitachi Car Engineering Co., Ltd.

Hitachi Astemo Ltd.

Hitachi Automotive Engineering Co., Ltd.

Tohru Ishikawa

Motoyuki Abe

Noriyuki Maekawa

Yoshihito Yasukawa

Ryo Kusakabe

Yoshio Okamoto

Hideharu Ehara

Atsushi Sekine

Makoto Yamakado

Takuya Mayuzumi

Yasuo Namaizawa

Masahiko Hayatani

Yuzo Kadomukai

Takao Miyake

Kiyotaka Ogura

Eiji Ishii

Ayumu Miyajima

Takehiko Kowatari

Shigenori Togashi

Hiroshi Fujii

Kenji Hiraku

Yoshiyuki Tanabe

Hiromasa Kubo

Masahiro Soma

Kiyoshi Amou

Yusuke Irino

Kiyoshi Amo

Toshiharu Nogi

Takuya Shiraishi

Hisanobu Kanamaru

Yoko Nakayama

Yusuke Kihara

Tokuo Kosuge

Mizuho Yokoyama

Masahiro Souma

Masahiro Tsuchiya

Tosuke Hirata

Koji Shibata

Yuichi Sasaki

Minoru Ohsuga

Satoshi Shimada

Toshiyuki Innami

Masahiro Toyohara

Tetsuo Matsumura

Koji Nakagawa

Akiyasu Miyamoto

Hiroshi Ohki

Yoshiya Takano

Satoshi Suzuki

Kazuki Yoshimura

Ryoichi Oura

Atsushi Takaoku

Koji Matsufuji

Akira Iizuka

Takao Teranishi

Kazuhiko Hanawa

Shuichi Shimizu

Masanori Mifuji

Kazufumi Yoshida

Mikio Nogami

Kenchiro Tokuo

Hisashi Ohwada

Kazutaka Hino

Yasuo Kamituma

Hitoshi Maeda

Atsushi Hitachi Car Engineering Co Ltd Sekine

In a fuel injection device, a driving unit structure has a magnetic aperture, in which an inner diameter is gradually enlarged toward the mover side, provided in an inner peripheral surface of the magnetic core. It is possible to reduce magnetic delay time upon valve opening from the supply of the electric current to the coil to the rise of magnetic flux and magnetic delay time upon valve closing from the stoppage of the electric current to the coil to reduction of magnetic flux, by providing a magnetic aperture in the inner peripheral surface of the magnetic core. Thus it is possible to improve the dynamic responsiveness upon valve opening and valve closing.

Fuel injection device

A fuel injection device including a valve body having an injection hole-formed part having a plurality of injection holes on the leading end side of the valve body. An injection hole comprises a crossing angle, &#x3b8;, between a central axis of the injection hole-formed part and an injection hole axis, and another injection hole comprises a crossing angle, &#x3b8;, between the central axis and another injection hole axis. &#x3b8;is larger than &#x3b8;. The injection holes are formed such that a distance between the central axis and an inlet surface center of the injection hole is longer than a distance between the central axis and another inlet surface center of the another injection hole. A straight line beyond an outlet surface in the injection hole axis does not intersect with another straight line beyond another outlet surface in the another injection hole axis.

In a drive unit of a fuel injection device, an electric current is supplied to the fuel injection device by applying a high voltage to the fuel injection device from a high voltage source whose voltage is boosted to a voltage higher than a battery voltage at the time of opening a valve of the fuel injection device. Thereafter, the electric current supplied to the fuel injection device is lowered to a current value at which a valve element cannot be held in a valve open state by stopping the applying of the high voltage from the high voltage source. Thereafter, in a stage where a supply current is switched to a hold current, another high voltage is applied to the fuel injection device from the high voltage source.

Drive unit of fuel injection device

A drive unit of a fuel injection device includes a driver circuit. The driver circuit opens and closes a valve element of the fuel injection device by supplying a drive current to the fuel injection device. The driver circuit supplies the drive current to open the valve element and sets the drive current to zero in an intermediate lift area. The intermediate lift area is an area is which a lift amount of the valve element is smaller than a maximum target lift amount.

A spark-ignition direct fuel injection valve includes, at least, a seat member provided with a fuel injection hole and a valve seat and a valve body which controls fuel injection from the injection hole by contacting and separating from the valve seat. In the spark-ignition direct fuel injection valve: the injection hole has an injection hole inlet which is open inwardly of the seat member and an injection hole outlet which is open outwardly of the seat member; an opening edge of the injection hole inlet has a first round-chamfered portion formed on an upstream side with respect to a fuel flow toward the injection hole inlet; and an extending length (L) of the injection hole does not exceed three times a hole diameter (D) of the injection hole.

Spark-ignition direct fuel injection valve

In an electromagnetic fuel injection which is structured such that both end surfaces of an inner circumferential iron core portion and an outer circumferential iron core portion face a movable iron core, and a non-magnetic portion made of a metal material is provided between both end surfaces, an object of the present invention is to realize a structure of the electromagnetic fuel injector in which a surface of a target object is unlikely to be affected by a heat treatment with the surface facing the movable iron core. In an electromagnetic fuel injectorof the present invention which is structured such that both end surfaces of an inner circumferential iron core portionand an outer circumferential iron core portionface a movable iron core, and a non-magnetic portionmade of a metal material is provided between both end surfaces, in order to achieve this object, heat in a target member to be heat treated is generated by applying energy to a target member's surface which is different from a target member's surface that faces the movable iron core. More preferably, energy is applied to a surface different from a surface on a side that faces the movable iron core

Electromagnetic fuel injector

A fuel injection valve includes a valve body, a coil, an inner fixed iron core that is arranged on an inner peripheral side of the coil, and an outer fixed iron core that is arranged on an outer peripheral side of the coil. The fuel injection valve also includes a movable element that is configured to be attracted to the inner fixed iron core and the outer fixed iron core, wherein the movable element is configured to be separable from the valve body and is configured to move the valve body.

A method of controlling a fuel injection device that can control a small amount of injection is provided. A fuel injection device for use in an internal combustion engine, includes: a valve body that can open and close a fuel passage, a needle that transfers a force with the valve body, and executes valve opening/closing operation, and an electromagnet that includes a coil and a magnetic core provided as a driver for driving the needle, and a cylindrical nozzle holder disposed on an outer periphery of the magnetic core and the needle, in which a current is supplied to the coil to exert a magnetic attractive force between the magnetic core and the needle to open the valve body.

In a fuel injection valve, it is possible to obtain spray in which the penetrating force of injected fuel is suppressed. The fuel injection valve includes a valve seat that forms a gap with a valve body, the gap allowing fuel to pass therethrough, and multiple injection holes that are located further downstream from the gap. The fuel to which pressure is applied flows out from the injection holes. When the flow velocity of the fuel in the gap formed between the valve body and the valve seat is indicated by meters per second, the flow velocity is set to be greater than a value obtained by multiplying the square root of the pressure applied to the fuel by 28. In this manner, the flow velocity in the gap increases, and flow velocity distribution inside the injection hole is uniformized, thereby suppressing an increase in penetration.

Fuel injection valve

In a fuel injection valve used in an internal combustion engine, fuel spray travel distance is shortened. There is provided a fuel injection valve including a seat member, in which the seat member includes a conical seat surface that seats fuel by coming in contact with a valve body, and inlet opening portions of a plurality of fuel injection holes on the conical seat surface, and is configured such that an axis of the injection hole connecting the centers of an inlet and an outlet of the fuel injection hole is along a plurality of different conical surfaces, and in which, in an outlet section that is configured of a plane parallel to an inlet section of the inlet opening portion of the fuel injection hole and is positioned at the outlet of the fuel injection hole, the seat member includes the injection hole in which a major axis direction of an ellipse of the outlet section has an inclination angle of greater than 0 degrees with respect to a straight line in a fuel injection direction, which is obtained by projecting the axis of the injection hole on the outlet section, and an inclination angle of a degree before being perpendicular to the straight line in the fuel injection direction.

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Kitaibaraki, Japan

Tohru Ishikawa