Hitachi, Ltd.

Hitachi Car Engineering Co., Ltd.

Hitachi Building Systems Co., Ltd.

Noriyoshi Urushiwara

Noboru Sugiura

Ryoichi Kobayashi

Nobuyasu Kanekawa

Minoru Ohsuga

Masatoshi Hoshino

Mitsuru Watabe

Yutaka Nishimura

Kohei Sakurai

Katsumi Ishikawa

Atsushi Kanke

Kazuhiko Kawakami

Norio Moriyama

Kiyoshi Nakata

Keisuke Horiuchi

Akira Matsushita

Takeo Takagi

Shuichi Terakado

Hiroaki Doi

Mitsutoshi Nakane

Yasunori Fujino

Akihiro Hishida

Taku Yamamoto

Kiyoshi Terasawa

Noboru Kobayashi

Ryouichi Kobayashi

Emi Onuma

Kentarou Mae

Naoya Hashiguchi

A power conversion device achieves size reduction and reliability by reducing the number of components of the system. The power conversion device has a semiconductor module of a half-bridge configuration in which two semiconductor elements are arranged in series. The semiconductor module has a cuboidal shape and has, along a longitudinal direction thereof, a positive pole terminal, a negative pole terminal, and terminals for inputting or outputting alternating current or for forming a single phase of the power conversion device. In the vertical direction corresponding to a widthwise direction of the cuboid, a plurality of the semiconductor modules are arranged vertically, forming a plurality of phases of the power conversion device. The semiconductor modules of the plurality of phases are installed in contact with a cooling unit, and one or more capacitors are disposed so as to face the cooling unit across the semiconductor modules of the plurality of phases.

Power conversion device and electric railroad vehicle equipped with power conversion device

The manufacturing method for an electronic circuit device comprises attaching an electronic circuit assembly including a circuit substrate with electronic circuit elements attached to a base, joining lead terminals integrally with the base via frames before molding the lead terminals composed of a different material from that of the base with mold resin, electrically connecting the lead terminals to the electronic circuit assembly, molding the electronic circuit assembly, lead terminals, and flange with mold resin in a batch partially excluding the flange and lead terminals installed on the base, and separating and removing the frames from the lead terminals and base after the molding with the mold resin.

Electronic circuit device and manufacturing method thereof

In an electronic circuit device including a substrate including a front surface on which an electronic circuit element is mounted and a reverse surface opposite to the front surface in a thickness direction of the substrate, an electrically conductive terminal member electrically connected to the electronic circuit element, a lead frame extending perpendicular to the thickness direction to face the reverse surface in the thickness direction, and a sealing resin covering at least partially the electronic circuit element, substrate and lead frame while at least a part of the electrically conductive terminal member is prevented from being covered by the sealing resin, the substrate extends to project outward from an end of the lead frame in a transverse direction perpendicular to the thickness direction while the end of the lead frame is covered by the sealing resin.

Electronic circuit device with reduced breaking and cracking

An engine electronic control unit is inserted through a through hole provided in an intake pipe and mounted in an intake air passage in a direction substantially perpendicularly with respect to a plane of the intake pipe forming the intake air passage. This unit is then secured to the intake pipe using a fixing flange provided at a connector portion. A fixing rail is protruded inside the intake pipe and leading edges of a metal base and a metal cover of the unit are inserted into this rail, thereby securing in position an end opposite to a side of the connector portion of the unit. This realizes an engine electronic control unit offering an outstanding heat radiation performance and vibration resistance, without having to provide special heat radiating parts or without involving an increase in an intake air resistance within the intake air passage. By using such an engine electronic control unit, it is possible to provide a low-cost, compact engine air intake system.

Control circuit module, intake air passage body, engine electronic control device, and engine air intake system provided with the same

An engine electronic control unit is inserted through a through hole provided in an intake pipe and mounted in an intake air passage in a direction substantially perpendicularly with respect to a plane of the intake pipe forming the intake air passage. This unit is then secured to the intake pipe using a fixing flange provided at a connector portion. A fixing rail is protruded inside the intake pipe and leading edges of a metal base and a metal cover of the unit are inserted into this rail, thereby securing in position an end opposite to a side of the connector portion of the unit.

A throttle body for an internal combustion engine includes an airflow sensor for measuring the flow rate of air passing through a throttle bore, a throttle position sensor for measuring the opening of a throttle valve in the throttle bore, and an engine control unit for controlling the engine. The engine control unit is secured to a base which is any other member than the body containing the throttle bore, and has pins which are electrically connected to at least any of a motor for driving the throttle valve, the airflow sensor, and the throttle position sensor.

Throttle body and air intake equipment for internal combustion engine

A rotating position detecting device is capable of detecting a rotating position with high accuracy even if there exists variation in the air gap, and thereby capable of widening a detectable range of the air gap. A position of an irregularity on the detected rotating body is converted into a rectangular wave-form electric signal, and a rotating position of the detected rotating body is detected based on a building-up signal or a falling signal of the rectangular wave-form. The rotating position detecting device has a magneto-electric converter element for outputting an electric signal corresponding to a magnetic intensity, a magnet for generating a magnetic field, and a detected rotating body made of a magnetic material having the irregularity.

Internal combustion engine rotating position detector using a

A switching circuit for an electronic distributor ignition device for an internal combustion engine. Current flowing through the primary ignition coil is controlled by a semiconductor switch circuit connected between the coil and ground. A control input to the semiconductor switch is also connected to ground by a pair of oppositely poled zener diodes which have a temperature coefficient which approximates that of the semiconductor switch circuit.

Electronic distributor ignition device for internal combustion engines

An ignition system of electronic distribution type for an internal combustion engine with which merits of sharing circuits and elements can be expected with satisfactory result, in which wires of a GND line will not be disconnected by fusion even under a condition of abnormal power supply, and in which the engine will not be stalled even in a mode of simultaneously igniting two cylinders, thus enabling the limp-form traveling and made start-up with simultaneous ignition of two cylinders. To this end, power transistors 20 through 25 for power supply control and feedback control circuits 30 through 35 for limiting currents are respectively provided to control ignition coils 4 through 9 in one-to-one relation. A total of two systems of resistance devices 17a, 17b for detecting currents are provided with each resistance device operating a respective group of three cylinders. The feedback control circuits and the resistance devices for detecting currents are formed on a thick-film circuit board 60. Wires 50a, 50b used for connection between a GND portion on the thickfilm circuit board and an external GND terminal 50 are provided in the same number, i.e., two, as the number of resistance devices. The sequence of power distribution to the cylinders is determined, taking into account the fact that the resistance devices for detecting currents are each allocated to a respective group of three cylinders.

Ignition system for internal combustion engine

An electronic distributor for an internal combustion engine, having a plurality of switching elements for conducting and breaking currents flowing to a plurality of ignition coils, a first lead frame for separately flowing the currents of the plurality of switching elements to the plurality of ignition coils and a second single lead frame for dropping current levels of currents of at least two switching elements of the plurality of switching elements to a common electric potential, characterized in that a resistance value of the first lead frames has been set to be larger than a resistance value of the second lead frame.

Electronic distributor

An induction discharge system ignition device for an internal combustion engine includes a power switching device for producing a voltage to be applied to the primary winding of an induction coil. The secondary of the induction coil is connected to apply a high-tension voltage to a spark plug. The power switching device and the coil are particularly arranged to produce a voltage of at least 6.0 kV across the electrodes of the spark plug when the spark plug has a leakage of 100 k.OMEGA.. The turns ratio of the coil is, preferably, 70 or less.

Induction discharge type ignition device for an internal combustion

This specification discloses an electronic distribution type ignition system wherein at least two ignition coils are provided, and wherein the secondary voltage of the ignition coils is directly supplied to spark plugs. An ignition system according to this invention comprises switching circuits for controlling the supply of a primary voltage to said, ignition coils, a resistance element wherein a current flows selectively which corresponds to a primary current for each of two ignition coils, supplied through two of said switching circuit, current control circuits for detecting a terminal voltage of said resistance element and for controlling, according to said terminal voltage, the primary current flowing through each said igniton coil so as to be at a target value, and a board having said resistance element formed thereon.

Electronic distribution type ignition system

Electronic circuits (11,12) are mounted on a metal base (13). The metal base is covered by a mold resin case (16) at the peripheral portion thereof. A projected portion (29) is formed along all the peripheral edge portion of the metal base. A step portion is formed to the metal base next to the projected portion of the metal base. A groove (28) is formed along all the peripheral portion of the bottom surface of the mold resin case. The projected portion is engaged to the groove which is filled with a bonding material (33). The bottom surface of the step portion is also covered by the bonding material when the projected portion is thrust into the groove of the mold resin case.

Electronic circuit apparatus of automobile

An ignition system for an internal combustion engine comprising a semiconductor switching device, which is controlled by a control unit, is disclosed. In response to an output from a device for detecting a shorting breakdown or a heat generation of a power switching device, the power switching device and the ignition coil are cut off from a power supply by a current cut-off device. Even when the power switching device is broken by shorting, the power generation due to continuous energization of the ignition coil is prevented, thereby preventing the ignition coil from being heated abnormally.

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Hitachinaka, Japan

Noriyoshi Urushiwara