ELECTRONIC IGNITION SYSTEM OF INTERNAL-COMBUSTION ENGINE

摘要

PURPOSE:To accurately and stably perform spark advance control in an ignition timing controller of an internal-combustion engine, by changing the characteristic of the capacitor's constant current discharging. CONSTITUTION:While passing through an amplifier 2 and a voltage limiter 3, the output of a pressure sensor 1 is turned to a voltage Vp depending on the negative pressure. Capacitor's electric charging and discharging is controlled according to the output A of a pick-up coil 4. An inclination of a charging and discharging waveform B may be in proportion to said voltage Vp. An ingition signal D is obtained by comparing the output of the charging and discharging waveform B with the output of a revolution number detecting circuit 11. The inclination of the discharging may be also controlled by changing over switches 9 and 10. Spark advance of the ignition may be thereby accurately and precisely controlled.