Igniton Switch

How does a ignition switch work?

The principle of the ignition system is to provide high-voltage electricity with sufficient energy to the spark plug at the appropriate time according to the working status of the engine and the engine's working sequence, so that sparks are generated between its electrodes to ensure that the mixture is ignited and the engine does work.

First, the ignition system should ignite according to the engine's working sequence. Secondly, ignition must occur at the most favorable time.

Because it takes a certain amount of time for the mixture to burn in the cylinder, the mixture should not be ignited at the top dead center of the compression stroke, but should be appropriately advanced so that when the piston reaches top dead center, the mixture has been fully burned, thus The engine can achieve higher power. Ignition time is generally expressed by the ignition advance angle, which is the angle of crankshaft rotation during a period of time from the spark to the top dead center of the piston.

If the ignition is too late and starts when the piston reaches top dead center, then the combustion of the mixture is mainly completed during the downward movement of the piston, that is, the combustion process proceeds as the volume increases, which increases The contact area between the hot gas and the cylinder wall, thus the heat converted into effective work is relatively reduced, and the maximum combustion pressure in the cylinder is reduced, causing the engine to overheat and reduce power.