| 摘要 |
PURPOSE:To prevent the occurrence of misoperation, by controlling the ignition timing on the basis of a top dead point signal and a turning angle signal in time of usualness but the top dead point signal alone when supply voltage is below the specified value. CONSTITUTION:Usually the ignition timing is calculated on the basis of a signal T04 of a turning angle detector 23 detecting a top dead point and a signal T24 of a turning angle detector 24 indicating a turning angle in a crank angle. Supply voltage is detected by a supply voltage detector 21 and converted into a digital value by an A/D converter 205. When this supply voltage is lower than the specified value, the ignition timing is controlled on the basis of a top dead point signal alone. With this constitution, no misoperation happens even if the supply voltage drops to some extent. |
