| 摘要 |
PURPOSE:To prevent the malfunction due to induction noise or the like by a method wherein the conduction and ignition circuit of the contactless ignition device for the internal-combustion engine is provided with an ON delay circuit, an ON lock circuit and an OFF lock circuit. CONSTITUTION:A signal (l), due to the induction noise upon ignition, is not outputted by a NOR circuit 302 when the time t1-t2 is below the time of lock-off. The potential of a capacitor 331, which is due to the signal (m) generated by the noise of an alternator, is shorter compared with an ON delay time t3-t4 in its charging time and is smaller compared with the potential of the capacitor 332, therefore, it is not outputted. In case of the signal shorter than the on-lock time t4-t5, the NOR circuit is formed by an AND circuit 305 and the waveform of the signal, therefore, the induction noise is not outputted. Thus, the malfunction will never be caused even if the induction noises are overlapped, by a method wherein the signals are kept in a predetermined signal level during the off-lock time t1-t2, the one-delay time t3-t4 and the on-lock time t4-t5. |
