System of capacitive discharge ignition for automobile vehicles with a converter governed by a multi-vibrator

A system for capacitive discharge ignition for automobile vehicles having a battery, a distributer and associated spark-plugs, said system including means for maintaining constant ignition characteristics of the spark-plugs independently of feed voltage from the battery, said means including a monostable multi-vibrator connected between the battery and the distributer, control means for controlling time of communtation of said monostable multi-vibrator, said control means including a resistance-condenser network, diode means for charging a condenser of said resistance-condenser network to a constant voltage value lower than lowest value of the voltage of the battery and for discharging said condenser at a time constant which is dependent upon the feed voltage to provide greater power to the spark-plugs than can be obtained normally from the battery when at low voltage, said diode means including a Zener-type diode connected in parallel with a collector-emitter of a first transistor of said monostable multi-vibrator, said first transistor being normally in OFF for charging said condenser, and a second transistor of said monostable multi-vibrator being connected to a resistance of said resistance-condenser network to shortcircuit said resistance when the feed voltage is higher than a prefixed value.