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火花點火

火花點火(英語:Spark ignition,簡稱:SI),是在活塞上行的壓縮行程到達一個階段,電腦會下達指令產生高壓電,使火花塞跳火而產生火焰,就是所謂的火花點火。此舉將使混合油氣燃燒,讓引擎從壓縮行程進入動力行程。

若引擎是使用分電盤,則是使發火線圈中的低壓線圈(一次線圈)通電,利用電磁感應,使高壓線圈(二次線圈)產生足夠的高壓電使火花塞跳火。

跳火的時間並不固定,會依車輛的行使狀況而改變。

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火花點火
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