Hitachi, Ltd.

Takashi Yoshinari

Noboru Sugiura

Mitsukuni Tsutsui

Seiji Suda

Kazuhiko Kawakami

Kazutoshi Kobayashi

Hiromitsu Nagae

Hitoshi Minorikawa

Hiroshi Watanabe

Terumi Okado

Hiroshi Fujiwara

Terumi Ookado

Toshiaki Iikubo

Yoshimi Kusaka

For a four cylinder engine, there are provided two ignition coil units, each including a primary coil and a secondary coil. The primary coil is wound around a center core made of grain oriented silicon steel, which forms a closed magnetic path for the magnetic flux produced by the coil unit together with a side core formed of non-grain oriented steel as one body. In the closed magnetic path there is provided an air gap. The current of the primary coils is controlled by transistors operated in response to gate signals furnished from an ignition control unit. The transistors are provided with a diode in the reverse parallel therewith. With these arrangements, the ignition coil assembly for an electronic distribution system can be miniaturized with the unfavorable influence of the magnetic inteference suppressed remarkably.

Ignition coil assembly for internal combustion engines

High-energy ignition device

A knock control system which includes a knock control unit constructed of a transducer portion for detecting vibrations of an engine and converting the detected vibrations into an electric signal, and a knock signal processing unit for delivering a signal indicative of the occurrence of a knock in dependence upon a receipt of the knock signal from the transducer portion. The knock signal processing circuit controls the ignition timing of the internal combustion engine on the basis of the knock signal from the knock control unit. At least one of the transducer portion and the knock signal processing circuit unit of the knock control system is mounted on a portion of a distributor which has a fixing base portion at a part of the housing thereof.

Knock control system

An ignition coil for an internal combustion engine including a first case of a hollow synthetic resin, which has one end fixing high voltage terminals for effecting connections with ignition plugs and its other end formed with an opening. Diode terminals are attached to the first case. The high voltage diodes which have the same side ends connected with the high voltage terminals from the first case and their other ends connected with the diode terminals. The high voltage diodes in the first case are encapsulated within an epoxy resin composite. Primary and secondary coils supplied with electric signals synchronized with a rotational speed in a secondary case to which primary and secondary terminals are attached. The second case is filled with an epoxy resin such that gaps between the wirings of the coils are sufficiently impregnated with that epoxy resin. The diode terminals and the secondary terminals are connected through the coils. The first case, accommodating the high voltage diodes and arranging the high voltage terminals in a row, the second case, accommodating the primary and secondary coils, the lead wires, and a portion of the primary terminals are molded of a synthetic resin into an integral structure.

Ignition coil for an internal combustion engine

A distributor for a contactless ignition apparatus of an internal combustion engine is disclosed. An ignition control circuit unit of contactless type is comprised of a case containing the ignition control IC circuit and a mold resin of the pick-up coil integrally formed with the case. The distributor contains closed magnetic circuit-forming means comprising a distributor shaft rotatable in synchronism with the engine, a reluctor or rotor fixed on the shaft and having claws in the number corresponding to the number of engine cylinders, a stator having a pair of claws opposed to the claws of the reluctor and mounted on the movable base of the angle advancer for advancing the ignition timing in response to a negative vacuum pressure, and a permanent magnet for generating a closed magnetic circuit through the reluctor stator and shaft. The pick-up coil of the ignition control circuit unit is arranged to cross the closed magnetic circuit, which unit is fixed within the distributor.

Distributor for contactless ignition apparatus for internal combustion

There is disclosed an ignition timing control system for an internal combustion engine which comprises a reference ignition signal generator, advance means for leading the ignition timing according to the number of engine revolutions, control means for controlling the ignition timing according to the pressure change in the intake pipe which varies with the engine load, a retard circuit for shifting the ignition timing by a selected retard angle with respect to the ignition timing which is determined by said advance means, and means for controlling the electric elements in said retard means to determine the retard angle thereof so as to cancel variation in the ignition timing due to atmospheric pressure change.

Ignition timing control system for internal combustion engine

In a molded ignition device, an ignition coil with primary and secondary coils is molded with synthetic resin. A metal casing is mounted on the outer surface of the molded coil. A microelectric circuit such as an IC circuit is disposed in the space defined by the casing and the outer surface of the molded coil.

Molded ignition device

Two ignition plugs are provided for each cylinder of an engine. Since it is desirable that these two plugs be sparked by one ignition coil, separate output terminal of a secondary coil of the ignition coil are respectively connected to each of the two plugs. An impedance circuit element is provided between one terminal of the secondary coil and ground to disturb a balance of the output voltages from the secondary coil terminals. The voltage of the other terminal of the secondary coil then reaches the break-down voltage between the air gap of its respective ignition plug first due to this imbalance of terminal voltages. The voltage of the one terminal then reaches the break-down voltage between the air gap of its respective ignition plug after the breaking-down of the other ignition plug. The two ignition plugs of each cylinder can thus be sparked at approximately the same time by providing the impedance circuit element between one output terminal of the ignition coil and ground.

Growing community of inventors

Katsuta, Japan

Takashi Yoshinari