| 摘要 |
PURPOSE:To optimumize an advance angle regulation according to the revolution of an engine by, when being in the low revolution sphere is detected on the basis of a pick-up signal, switching to the second angle-advance control system from the first system and giving an ignition signal to a switching element. CONSTITUTION:At the time of the ordinary revolution of an engine, an analogue switch 10 is on the first angle-advance control system A side by means of the output of a revolution-detection-circuit 9, and a pickup signal from a sensor 3 synchronous with the revolution of the engine is subjected to an angle-advance regulation according to revolution at an angle-advance control circuit 5 through an operation-amplifier 4, and the off-timing of a switching element Q is controlled. Meanwhile, at the time of low revolution, the switch 10 is changed over to the second angle-advance control system B side, and an ignition signal which is, regardless of the number of the revolutions of the engine, always almost fixedly angle-retarded is made out of a negative electrode quality signal taken out of the pick-up signal by a comparator 6, and an ignition control is conducted through the element Q. Thus, in the ordinary revolution sphere is conducted the optimum advance angle regulation according to its revolution, and in the low revolution sphere is conducted a stable ignition at an almost fixed angle-advance value.
|
