Hitachi, Ltd.

Hitachi Car Engineering Co., Ltd.

Other

Kenji Ono

Yasuhiro Kamimura

Norihiro Isozaki

Masahiko Soshino

Hitoshi Andoh

Yuzo Kadomukai

Takehiko Kowatari

Eisuke Wayama

Yuki Ejiri

Yutaka Takeuchi

Hiroyuki Yamada

Masanori Kubota

Kenji Miyata

Yoshihiko Akagi

Hidefumi Iwaki

Yasuo Saito

Takahiro Shimura

Satoshi Yamazaki

Kenichi Katagishi

Mitsuru Sudo

Hisashi Yukita

Takekazu Ootsuka

A throttle valve controller for an internal combustion engine has a throttle valve driven by a motor. The target opening of the throttle valve is determined based on the operating state of the vehicle or internal combustion engine. A first lower limit is determined beforehand as the minimum target opening, and a second lower limit is set which is smaller than the first lower limit if the determined target opening is smaller than a predetermined opening and/or if the rotation speed of the internal combustion engine is lower than a predetermined speed.

Throttle valve controller for internal combustion engine

A rotational position sensor having a compact and simple structure, in which a magnetic surface can be formed to have a more accurate shape, and an electronically controlled throttle device for an internal combustion engine, which employs the rotational position sensor. The rotational position sensor comprises a pair of substantially half disk-shaped magnetic cores disposed in an opposed relation to each other with a magnetic sensitive device interposed therebetween, a pair of substantially arc-shaped magnetic cores disposed in an opposed relation to each other along outer peripheries of the half disk-shaped magnetic cores, and a permanent magnet fixed in contact with at least one of the arc-shaped magnetic cores. Magnetic flux generating from the permanent magnet flows successively through one of the arc-shaped magnetic cores, the half disk-shaped magnetic cores, and the other of the arc-shaped magnetic cores, followed by returning to the permanent magnet. The half disk-shaped magnetic cores or the permanent magnet is rotatable, and the magnetic sensitive device detects an amount of the magnetic flux varying with rotation of the half disk-shaped magnetic cores or the permanent magnet.

Rotational position sensor and electronically controlled throttle device and internal combustion engine

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

There is provided a compact, noncontact rotary position sensor that accurately detects a rotary position of a rotating object. A magnetism throttling portion is provided in a midway point of a magnetic path. Two magnetic induction elements are disposed adjacently each other at the magnetism throttling portion. This arrangement effectively allows a magnetic flux to converge at the location, at which the magnetic induction elements are mounted. A noncontact rotary position sensor offering high sensitivity and high accuracy can then be obtained. It is also possible to simplify routing of signal lines from the two magnetic induction elements, since the two magnetic induction elements are adjacent to each other.

Noncontact rotary position sensor and electric control throttle valve apparatus having noncontact rotary position

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

A control device for an internal combustion engine is configured to switch over at least one of fuel injection amount and ignition timing to an emergency traveling mode in the event that an electric actuator for driving a throttle valve malfunctions, at which time the throttle valve is set at a default position. At the time of the emergency traveling mode, throttle valve opening degree is set at a value larger than the opening degree when an accelerator pedal is not depressed during normal operation. Fuel amount is set to obtain necessary engine rpm for the emergency traveling mode and when the acceleration pedal is not depressed or the vehicle speed is zero, ignition timing is retarded with respect to ignition timing during normal idling operation.

Throttle valve control device for an internal combustion engine

A motor-driven throttle valve control device has a main body in which an air intake path is formed. The throttle valve is secured on a rotatable shaft supported by the main body. An electric motor drives the throttle valve through a gear mechanism. A throttle valve sensor is provided to detect the valve opening angle. Default and return springs are provided to bias the throttle valve. The main body includes a cover at one end of the throttle shaft. The gear mechanism, angle sensor and default and return springs are located between the cover and the main body of the throttle valve device.

Throttle valve device for an internal combustion engine

A motor-driven throttle valve control device has a throttle shaft and a coupling lever rotatably provided on the shaft, both being coupled by a spring. A default spring energizes the coupling lever toward a position of the default opening of the throttle valve. The throttle shaft rotates separately from the coupling lever in the direction of the full open throttle valve from a point at which the coupling lever comes into contact with a stopper defining the default position and, together with the coupling lever, in the full close direction of the throttle valve from the point. Thereby, the throttle valve can be kept at the default position by the default spring through the coupling lever when a motor driving the throttle valve is not powered.

Growing community of inventors

Mito, Japan

Kenji Ono