Ignition coil (Focus Turnier 1)

In order for spark plugs to produce a spark, a high voltage must be discharged across their electrodes. Depending on the ignition system, the discharge voltage exceeds 30,000 V.

Conventional ignition coils consist of two windings: a primary winding with a small number of turns (around 100) made of thick copper wire (around 0.6 mm²) and a secondary winding with several thousand turns of thinner copper wire (around 0.1 mm²). Both windings surround a laminated ferromagnetic core. At the signal of the control unit, the primary winding receives current from the battery (low voltage) via the integrated ignition power module. As a result, an electromagnetic field is formed, which is transmitted to the secondary winding.

If the control unit interrupts this electrical circuit, the electromagnetic field suddenly disappears for a fraction of a second. At the same time, a voltage of up to 400 V occurs in the secondary winding, which produces a high-voltage current pulse (induction) of more than 30,000 V. Focus engines have an electronic ignition system with two ignition coils (E1), which send the ignition spark in the working sequence 1-3-4-2.

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