What is the Function of an Automotive Ignition System?

[ArcherLee]

The function of an automotive ignition system is to generate a sufficiently energetic electric spark between the electrodes of the spark plug in accordance with the working sequence of the cylinders. The secondary voltage produced by the ignition system must exceed the breakdown voltage to ensure the spark plug fires. The voltage required to cause the spark plug electrodes to break down and produce a spark is referred to as the breakdown voltage. Factors influencing the magnitude of the breakdown voltage include: 1. The larger the gap between the spark plug electrodes, the higher the breakdown voltage; sharp and distinct edges on the electrodes require a lower breakdown voltage. 2. The higher the pressure of the air-fuel mixture and the lower the temperature, the higher the breakdown voltage. 3. The higher the temperature of the spark plug electrodes, the lower the density of the surrounding gas, resulting in a lower breakdown voltage.