| 摘要 |
PURPOSE:To enable execution of accurate ignition at a demand ignition timing, by a method wherein the number of revolutions determine during input is corrected by a past value, the number of revolutions at a present ignition execution timing is estimated, and a lag time is calculated from the two values. CONSTITUTION:A number of revolutions correcting circuit 5 corrects at 5 a number of revolutions fundamental computing value from a current fundamental computing value, sent from a reference angle sensor 1 through a timer circuit 2 and a number of revolutions computing circuit 3, and a past number of revolutions fundamental computing value of a memory circuit 4 to memory it by a correction value memory circuit 6. Meanwhile, a number of revolutions estimating circuit 9 computes and estimates the number of revolutions at a point of time of an ignition timing from a current and a past number of revolutions correcting computing value and a demand ignition timing, determined by an ignition timing computing circuit 8 from a signal from a negative pressure sensor 7 and the correction number of revolutions thereof. A lag time computing circuit 10 calculates a lag time during a time between a point of time of a reference signal input and a demand ignition timing from a correction and an estimated value to drive an ignition driving means 11. This constitution accurately coincides an ignition timing with a demand ignition timing, and enables prevention of malfunctioning of an engine.
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