| 摘要 |
PURPOSE:To carry out an ignition position control with the range for generation of sud sounds avoided, in the ignition timing control device for an internal combustion engine. CONSTITUTION:An addition circuit is furnished, in which the voltage changing to the minimum ignition position by means of suction pressure with a point a certain period of time delayed from the maximum angle advacne ignition position as base point to the second triangle wave. Thereby such a characteristic is provided that the ignition timing is carried out by avoiding the range for generation of sud sounds, A. That is, in the range with small negative pressure, the characteristic becomes as a-b-c-d while it will become as a-b1-c1-c if the negative pressure becomes one. If the negative pressure rises further, the characteristic shall become as a-b2-c2-c-d. In order to obtain such a characteristic, the triangle wave 1 is compared with a wave formed of the triangle wave 2 added with a constant voltage in accordance with the negative pressure Vp. |
