What does CDI mean in a motorcycle engine?

[KiraLee]

CDI in a motorcycle engine is the abbreviation of "Condenser-Drode-Ignite" in English, which means "Capacitor Discharge Ignition". Working principle of the CDI system: When the engine is running, the magneto also rotates to generate current. The current is rectified by a silicon diode to charge the capacitor, at which time the thyristor is in the off state and current cannot pass through the thyristor. When the pulse rotor rotates to the ignition position, the pulse generator sends an electrical signal, which is applied to the control electrode of the thyristor to trigger the thyristor to conduct. Then, the electrical energy of the capacitor enters the ignition coil through the thyristor. When the pulse rotor passes the ignition position, the pulse generator stops sending the electrical signal, and the thyristor immediately turns off, cutting off the current of the ignition coil. At this time, the ignition coil will immediately generate a self-coupled high voltage, causing the spark plug to emit a spark for ignition. This cycle repeats continuously to ensure the normal operation of the engine. Other methods of electronic ignition for motorcycles: Capacitor discharge battery ignition system (DC-CDI); Inductive discharge ignition method.