What is an ignition system primarily used for in an engine?

The ignition system in an engine is primarily used to ignite the air-fuel mixture. This process is crucial for the operation of internal combustion engines, as it is the ignition of this mixture that initiates the combustion process. When the air-fuel mixture is compressed within the engine's cylinders, the ignition system generates a spark at the right moment to ensure that the mixture ignites efficiently.

This combustion produces the energy required to power the engine, allowing it to convert fuel into mechanical energy. The timing and effectiveness of this ignition process are vital for optimal engine performance, fuel efficiency, and emissions control. The ignition system includes components such as spark plugs, ignition coils, and control modules, all of which work together to ensure that the spark is generated at the correct time in the engine cycle.

While the other options may relate to different engine functions, they do not pertain to the primary role of the ignition system, which is to initiate combustion in order to allow the engine to run.