Nippondenso Co., Ltd.

Toshio Tanaka

Tomoatsu Makino

Katsuteru Miwa

Shigeya Abe

Shinro Torii

Kouichi Sasaki

Tsuneo Kato

An internal combustion engine contactless ignition system of the supply voltage variation compensation type in which the length of time an ignition coil is energized is controlled by an input transistor in response to an alternating current signal synchronized with the rotation of an engine and the operating level of the input transistor is automatically shifted in response to variation of the voltage of a power source, further comprises an inverting transistor having a base connected to the collector of the input transistor, an emitter connected to one end of the power source through a common emitter resistor and a collector connected to the other end of the power source through collector resistors and a Zener diode whereby an ignition coil energization controlling power transistor is controlled through the inverting transistor.

Internal combustion engine contactless ignition system of supply voltage

A supply-voltage-compensated contactless ignition system for internal combustion engines, which includes input transistor operable in response to an engine ignition signal so as to control the operation of a power transistor to control the energization of an ignition coil with the operating level of the input transistors being varied with variation in the supply voltage, further includes a current mirror circuit having first and second current shunt paths including first and second transistors which are connected in parallel with a voltage clamping device such that the each current path substantially the same amount of current when the supply voltage is normal and that one of the current paths shunts a current increased over that of the other in response to a rise of the supply voltage beyond a predetermined value, and includes a shunt device for shunting the increased current to the input transistors.

Supply-voltage-compensated contactless ignition system for internal

A contactless ignition system for an internal combustion engine including an ignition signal generator having two pickup coils which are connected in series or parallel and oppositely in polarity to each other so as to be responsive to the rotation of a signal rotor in order to generate respective AC signals with one signal occurring at an intermediate position of the other, an input circuit disposed so as to be turned on or off when the AC signal from the ignition signal generator exceeds predetermined values in the positive and negative directions, respectively, an inverter circuit disposed to invert the output of the input circuit, first and second output circuits for generating a first output to turn on or off responsive to the output of the input circuit and a second output to turn off or on responsive to the output of the inverter circuit, and first and second ignition coils respectively responsive to the first and second outputs each so as to switch on and off the primary current therethrough.

Growing community of inventors

Anjo, Japan

Toshio Tanaka