| 摘要 |
PURPOSE:To prevent engine stop by controlling the ignition timing in accordance to engine speed and load, by igniting with predetermined lead angle upon detection of deceleration thereby preventing dropping of revolutions immediately after reset of idling. CONSTITUTION:When a throttle valve 8 is fully closed and the car speed is below referential level, a microcomputor 28 will decide it to be an idle state and to read out the idle ignition lead angle stored in ROM. Then predetermined angle is subtracted from basic ignition lead angle calculated from every predetermined time or crank angle to perform processing for approaching gradually to idle ignition lead angle and return. Thereafter the basic ignition lead angle is corrected on the basis of signals to be provided from various sensors to obtain the ignition lead angle which is used together with ignition angle calculated to approach gradually to the idle ignition lead angle to control on-off period of ignitior and the ignition timing. In such a manner, ignition lead angle from deceleration to immediately after reset of idling is led when compared with conventional one to prevent drop of rotation upon unclutching immediately before stoppage. |
