Hitachi, Ltd.

Other

Hitoshi Andoh

Kenji Ono

Masahiko Soshino

Yuzo Kadomukai

Takehiko Kowatari

Eisuke Wayama

Yasuhiro Kamimura

Yuki Ejiri

Norihiro Isozaki

Yutaka Takeuchi

Yasuo Saito

Takahiro Shimura

Satoshi Yamazaki

Teruhiko Minegishi

Masanori Kubota

Kenjo Ono

The invention is intended to simplify a default mechanism of a throttle valve opening and closing device for the purpose of improving mountability of the device to a vehicle. When a motor generate no driving forces, a throttle valve is held in a position () by a return spring. In this position, gaps are formed between the throttle valve and a wall surface of an intake passage. Spherical recesses are formed in parts of the wall surface of the intake passage. In a position () where the throttle valve is opposed to the spherical recesses, the gaps are minimized in an operating range of the throttle valve.

Throttle valve opening and closing device

An air passageis provided with an air passage groovethat supplies a required volume of air to the side downstream from the fully closed position of a valve body for control purposes. Further, a taper is formed in such a way that a predetermined volume of air can be supplied, even if positional variations have occurred to the valve body. This arrangement allows the volume of air required for the traveling of a car to be supplied, without increasing the number of parts, even if the valve bodyhas stuck downstream from the controlled area. This arrangement also permits a stable supply of air flow at the idle position of the valve body.

Air intake control device for internal combustion engine and air intake control device for gasoline engine

A curved passage constituting part of an exhaust gas recirculation passage is installed inside a suction passage in the downstream of an electronic control throttle valve, of which initial position is the fully opened position, and an exhaust gas recirculation flow control valve is installed in the cylindrical portion extending coaxially from the curved passage into a suction passage. The control valve is a butterfly valve driven by a motor via a reduction gear mechanism. In addition, the control valve opening is sensed by a sensor and cooled exhaust gas flow is sensed by a flow sensor at the outlet of an exhaust gas cooler, and the control of the control valve is based on these sensor signals.

Electronic EGR gas control system

Provided herein is a non-contact type rotational position sensor which is allowed to achieve intensification of parts, miniaturization, simplification of assembly, and higher accuracy. A rotor (a permanent magnet) is mounted on a rotational shaft. A Hall IC is interposed between an upper stator and a lower stator which are magnetic plates. The Hall IC is sensitive to magnetic flux density which varies according to a rotational position of the rotor. In a housing incorporating the rotor and the Hall IC is provided integrally a connector provided with an external connection terminal. Conductors for connecting external connection terminals and input/output terminals of the Hall IC are embedded into the housing by insert-molding. One ends of conductors are exposed at a fixed position where the input/output terminals are present. The terminals of the Hall IC are guided by a guide and joined to the one ends of conductors.

Rotational position sensor, and electrically operated throttle device and accelerator position sensor using the same

Growing community of inventors

Hitachinaka, Japan

Hitoshi Andoh