| 摘要 |
An ignition timing control system for an internal combustion engine comprising a circuit for generating a reference ignition signal in synchronism with the engine, a circuit for generating a retard ignition signal at a point shifted by a selected shaft angle of the engine from the reference ignition signal, and an ignition circuit for controlling the ignition timing of the engine according to the retard ignition signal. The retard ignition signal generator includes a capacitor circuit for charging and discharging, a first constant-current circuit for always supplying a first current to the capacitor circuit, a second constant-current circuit for supplying a second current larger than the first current to said capacitor circuit, a switching circuit which starts the flow of the second current in synchronism with the reference ignition signal and cuts off the second current when the terminal voltage across said capacitor circuit reaches a reference level, and an output circuit for generating a retard ignition signal in synchronism with the cutting-off operation of said switching circuit.
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