| 摘要 |
PURPOSE:To improve the reliability in the travelling with an anomaly by generating an ignition timing signal on the basis of the front part signal obtained from the output wave form of a pulser coil synchronized with the revolution of a crankshaft when the device operates normally and by generating the ignition timing signal on the basis of the rear part signal when an anomaly is generated. CONSTITUTION:During the engine operation, the ignition timing is calculated from the time relation between the front part signal corresponding to the front part wave form 31 in pulser wave form which is supplied from a pulser coil 9 and extracted in a signal extracting circuit 10 and the front part signal which is input previously, and the ignition timing signal on the basis of the result of calculation is outputted from a terminal 14. If an anomaly is generated in an ignition controller 13 at this time and a disturbance in the cycle of the output signal at an output terminal 15 is generated, a disorder detecting circuit 16 detects the anomaly from this disturbance. When the disorder is detected, an AND circuit 17 is allowed to conduct, and the rear part signal corresponding to the rear part wave form 32 in pulser wave form which outputted from an output terminal 12 in the signal extracting circuit 10 is outputted into an ignitor 1.
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