What is the function of ignition system of automobile gasoline engine? How many classification methods are there?

The function of ignition system of automobile gasoline engine is to ignite combustible mixture and start the engine.

Classification:

First, the traditional ignition system:

Battery ignition system?

Magneto ignition system?

Second, the electronic ignition system:

(1) transistor ignition system TI-B

(2) Semiconductor ignition system SI

(3) DIS without distributor ignition system

Structure (take the most common battery ignition system as an example):

1): power supply (battery or generator), ignition coil, distributor, spark plug, ignition switch and control circuit.

2) Working principle: at startup: battery positive terminal G starter live wire terminal G starter short-circuit conductive sheet G ignition coil' switch' terminal G low-voltage ignition coil low-voltage terminal G distributor terminal G grounding G battery negative terminal.

After startup: generator armature G ammeter G ignition switch G ignition coil power supply G thermistor G ignition coil switch G low-voltage coil G ignition coil low-voltage terminal G distributor contact G grounding G battery negative electrode.

High-voltage circuit: the high-voltage coil G, the central high-voltage wire G, the ignition head G, the cylinder G, the central electrode G of the spark plug G, and the electrode G next to the spark plug G are grounded.

The main components of the battery ignition system: ignition coil, distributor, capacitor, spark plug, high-voltage line, etc.

When the gasoline engine is running, the cam of the circuit breaker is driven to rotate, so that the circuit breaker is constantly closed and disconnected. In the contact closed type, the battery provides current, and the current returns to the negative electrode of the battery through the primary winding of the ignition coil and the electric shock of the circuit breaker.

When the current flows through the primary winding of the ignition coil, a strong magnetic field for energy storage is generated in the iron core. When the contact of the circuit breaker is pushed away, the primary current rapidly decays or even disappears, and the magnetic flux in the iron core correspondingly decreases, and the high voltage required for ignition is induced in the secondary winding. The voltage is transmitted from the high-voltage line to the distributor, and then from the distributor to each corresponding spark plug, generating an electric spark.