| 摘要 |
PURPOSE:To enable to converge an idling revolution upon a fixed value accurately, by correcting ignition timing by corresponding to a variation quantity of a number of revolutions under an idling state. CONSTITUTION:When a throttle valve is fully opened by a throttle sensor 2, the temperature of cooling water is higher than a fixed value by a water temperature of cooling water is higher than a fixed value by a water temperature sensor 4 and a number of revolution of an output shaft of a transmission is more than a fixed value, it is judged that an engine is in an idling state. At this time, ignition timing is corrected toward a lead angle side when the number of revolutions are lower than the previous ones and it is corrected toward a lag angle side when the number of revolutions are higher than the previous one. To obtain a correction quantity DELTAtheta for ignition timing from a variation quantity DELTAN of the number of revolutions it may be obtained either by an operational expression or by an interpolation by storing through mapping beforehand. |
