초록 ▼

In an ignition system for an internal combustion engine, a signal generator generates a given ac signal in synchronism with the rotation of the engine and a waveform reshaping circuit reshapes the waveform of the ac signal from the signal generator thus generating a pulse signal. An ignition timing

In an ignition system for an internal combustion engine, a signal generator generates a given ac signal in synchronism with the rotation of the engine and a waveform reshaping circuit reshapes the waveform of the ac signal from the signal generator thus generating a pulse signal. An ignition timing control circuit is responsive to the pulse signal from the waveform reshaping circuit to control the timing of ignition of an ignition coil in which a primary current is switched on and off in accordance with the pulse signal.

대표청구항 ▼

An ignition system for an internal combustion engine comprising: a signal generator for generating, in synchronism with rotation of an engine, an ac signal including a slope portion sharply varying in one direction and another slope portion varying slowly in the other direction; a waveform reshaping

An ignition system for an internal combustion engine comprising: a signal generator for generating, in synchronism with rotation of an engine, an ac signal including a slope portion sharply varying in one direction and another slope portion varying slowly in the other direction; a waveform reshaping circuit for reshaping the waveform of the ac signal from said signal generator to generate a pulse signal; and an ignition coil responsive to the pulse signal from said waveform reshaping circuit to switch on and off the flow of a primary current therethrough, said waveform reshaping circuit including a pump-up circuit responsive to leading-edge and trailing-edge transitions of the pulse signal from said waveform reshaping circuit to alternately feed back biases each increasing to a maximum immediately after one of said transitions and thereafter decreasing gradually and tending to aid said one transition, and bias disabling means for disabling, during a starting period of said engine, one of the biases from said pump-up circuit associated with the transition of the pulse signal from said waveform reshaping circuit corresponding to the slowly varying slope portion of the ac signal from said signal generator.