The composition of automobile ignition system and the function of each component.

The basic components of engine ignition system include: power supply, sensor, ECU, igniter, ignition coil, distributor and spark plug. Their functions are as follows:

Power supply: generally composed of storage battery and generator, it is mainly used to provide the required electric energy for the ignition system. ?

Sensor: It is used to detect various working parameters of the engine and provide ECU with signals needed for ignition control. ?

ECU: It is the center of electronically controlled ignition system. ?

Igniter: the executive part of electronically controlled ignition.

Ignition coil: stores the energy required for ignition and converts the low-voltage electricity provided by the power supply into high-voltage electricity of 15 ~ 20kV enough to generate a breakdown spark between electrodes. ?

Distributor: According to the ignition sequence of the engine, the high-voltage electricity generated by the ignition coil is transmitted to the spark plugs of each cylinder in turn.

Spark plug: use the high-voltage electricity generated by the ignition coil to generate sparks to ignite the mixture in the cylinder.

Extended data

Working principle of engine ignition system;

When the engine is working, the ECU determines the best ignition advance angle and power-on time according to the signals received from various sensors and the relevant programs and data stored in the memory, and sends instructions to the igniter accordingly.

The igniter controls the on-off of the primary circuit of the ignition coil according to the instruction. When the circuit is connected, current flows through the primary circuit in the ignition coil, which stores ignition energy in the form of magnetic field. When the primary circuit is cut off, a high induced electromotive force (15 ~ 20kV) is generated in the secondary coil, which is sent to the spark plug of the working cylinder through the distributor or directly.