Kokusan Denki Co., Ltd.

Yasukazu Hatano

Akira Shimoyama

Masayuki Sugiyama

Kiyotada Nakauchi

Hidetoshi Suzuki

Satoshi Hitomi

An ignition device for an internal combustion engine including: an exciter coil that generates an AC voltage having a positive half wave and first and second negative half waves generated before and after the positive half wave with rotation of the internal combustion engine; and an ignition control portion that controls an ignition position of the engine using a microprocessor to which a power supply voltage is supplied from a power supply circuit that converts the voltage having the negative half waves generated by the exciter coil to a DC voltage, wherein the ignition control portion is comprised so as to cause a timer to start a counting operation at the start of the operation of the microprocessor, regard a measurement value of the timer as time between generation of the first negative half wave and generation of the second negative half wave to arithmetically operate counting data for measuring the ignition position based on rotational speed information of the engine obtained from the time, and immediately measure the arithmetically operated counting data to generate an ignition signal.

Ignition device for internal combustion engine

A capacitor discharge ignition device in which a coil unit including an ignition coil and an exciter coil wound around a common core, and an ignition unit including a circuit board and components of an ignition circuit mounted to the circuit board are housed in a case and molded with resin poured into the case, wherein the ignition coil and the exciter coil are placed axially with a spacing therebetween and a space is formed between the coils, the circuit board of the ignition unit is placed on a lateral side of the coil unit, and terminals for connecting the ignition coil and the exciter coil to the circuit board are all connected to the circuit board through the space between the ignition coil and the exciter coil.

Capacitor discharge engine ignition device

A capacitor discharge ignition device for an internal combustion engine including: idling time advance angle control permission condition determination means for determining whether an idling time advance angle control permission condition is met that is a condition for permitting control to advance an ignition position during idling immediately after completion of the start of the engine in order to stabilize idling immediately after completion of the start of the internal combustion engine; and idling time advance angle control means for advancing the ignition position during idling immediately after completion of the start of the internal combustion engine when it is determined that the idling time advance angle control permission condition is met.

A capacitor-discharge-type ignition device for an internal combustion engine, comprising: an exciter coil that generates an AC voltage having a positive half-wave voltage and first and second negative half-wave voltages present before and after the positive half-wave voltage synchronously with rotation of the engine; ignition-position detection time data calculating means that arithmetically operates as ignition position detection time data, the time period that is required for the engine to rotate from the generating position of the second negative half-wave voltage to an ignition position suitable in starting period, at the rotational speed of the engine that is obtained from time period from generation of the first negative half-wave voltage to the generation of the second negative half-wave voltage, and from an angle between the generating position of the first negative half-wave voltage and that of the second negative half-wave voltage, wherein a crank angle position when the measurement of the arithmetically operated ignition position detection time data is completed is determined as an ignition position at a low speed operation of the engine.

A rotational speed control system for an internal combustion engine capable of preventing a dead time or dead section from occurring in controlling of a rotational speed of the engine. An integrating circuit is controlled by means of an output of a comparator for comparing a rotational speed detection signal with a target rotational speed setting signal, to thereby obtain an integral voltage which falls and rises when the rotational speed detection signal is above and below the target rotational speed setting signal, respectively. Comparison of the integral voltage with a sawtooth signal voltage leads to a pulse signal subjected to pulse width modulation. The pulse signal is fed to an actuator driving circuit to carry out on-off controlling of a drive current for the actuator. Connection of voltage limiting circuits to the integrating circuit causes a variation of the integral voltage to be limited within a range of amplitude of the integral voltage, to thereby eliminate the dead time or dead section.

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Numazu, Japan

Yasukazu Hatano