The working principle of spark plugs
2025-11-10
High-voltage power introduction: The ignition coil boosts the 12V voltage to over 10,000 volts, which is then transmitted via high-tension wires to the spark plugs.
High-voltage power introduction: The ignition coil boosts the 12V voltage to over 10,000 volts, which is then transmitted via high-tension wires to the spark plugs.
Ionization discharge: High voltage causes the air between the central electrode and the side electrode to ionize, generating charged ions and free electrons.
Sparking occurs: When the voltage reaches a critical level, the air loses its insulating properties, creating a discharge channel that generates sparks with temperatures as high as 2000–3000°C, igniting the air-fuel mixture.
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An overview of automotive spark plugs
Spark plugs are critical components in gasoline engines, responsible for igniting the air-fuel mixture in the combustion chamber. They create a spark that initiates combustion, which powers the engine.
