Composition Of The Ignition System

The ignition system is mainly composed of the following parts:

Power supply: The power supply of the ignition system is usually provided by a battery or a generator, which is used to provide a low-voltage DC power supply for the ignition system, and the voltage is generally 12V.
Ignition coil: The function of the ignition coil is to convert the 12V low-voltage electricity into 20kV high-voltage electricity, and its structure is similar to that of an autotransformer.
Distributor: The distributor is composed of a distributor, a signal generator and a mechanical ignition advance angle adjustment mechanism. Although modern engine ignition systems mostly use direct ignition, distributors still have certain applications in traditional systems.
Ignition controller: The ignition controller is also called an ignition module, which is composed of a shaping circuit, an amplification circuit and a switching circuit, and is used to control the on and off of the primary circuit of the ignition system.
Spark plug: The function of the spark plug is to introduce high voltage electricity into the combustion chamber of the cylinder to generate an electric spark to ignite the mixture.
High-voltage wire: The high-voltage wire connects the ignition coil, the distributor and each spark plug to transmit high voltage electricity.
‌Ignition switch‌: The ignition switch controls the primary circuit of the ignition system, the excitation circuit and the starting circuit of the charging system, and all electrical equipment controlled by the ignition switch.
‌Sensor‌: The sensor is used to detect various operating parameters of the engine, such as camshaft position, crankshaft position, detonation, etc., and provide the ECU with the signals required for ignition control.
‌ECU (Electronic Control Unit)‌: The ECU is the center of the electronically controlled ignition system. It receives the signals sent by various sensors, performs calculations, storage and analysis, and finally sends a control signal to the igniter to complete the control of the ignition advance angle, power-on time and detonation.
‌Ignitor‌: The igniter is the actuator of the electronically controlled ignition system. It amplifies the control signal sent by the ECU, controls the power on or off of the primary circuit of the ignition coil, and sends an ignition confirmation signal to the ECU after the ignition is completed.