| 摘要 |
PURPOSE:To permit the ignition timing control conforming to the operating condition of the engine except a knocking condition by a method wherein an adding circuit, correcting the amount of retard by an external signal in accordance with the operating condition, and a retard circuit, controlling the ignition timing by a circuit output signal, are provided in the device. CONSTITUTION:A basic spark angle characteristics A, obtained by a vacuum spark angle advancing device 31, is corrected in accordance with a retard amount signal from the adding circuit 24. This signal is the signal, in which the retard amount, determined in a decision circuit 2 based on a signal from a knock sensor 1, is corrected based on the external signals such as the signals of a water temperature sensor 26, a revolving number sensor 27, a throttle opening degree sensor 28, an idling switch sensor 29 and a manifold vacuum sensor 30, which are outputted from a computer 25, therefore the ignition timing may be controlled in accordance with the various kind of operating conditions including the knocking condition. According to this retard amount, the actual ignition timing is delayed later than the same shown by a curve A and the most proper ignition timing may be obtained. |
