Ignition Coil: Description and Operation

GF15.10-P-2100BK Component Description Of Ignition Coil







Location
For each cylinder, a double ignition coil is located at the cylinder head cover.







Task
The ignition coils provide sufficient ignition energy under all operating conditions for the respective ignition circuit.

Design
Two spark plugs per cylinder, controlled by a double ignition coil. The double ignition coils have two separate ignition circuits, two ignition cable connections and a 3-pole plug connection.







The ME control unit simultaneously actuates both primary windings of the double ignition coils at circuits 1a and 1b to ground.

The primary current flow is interrupted at the moment of ignition timing point. As a result of the sudden collapse of the magnetic field the ignition voltage is generated in the secondary windings. The respective ignition voltage is sent via high-voltage terminals 4a and 4b via short ignition lines and spark plug connectors to the spark plugs.

The voltage supply for the double ignition coils is provided via "circuit 15".

Diodes are built-in to the secondary ignition circuit to suppress additional ignition sparks when the primary current is switched on.

Because of the diodes, it is not possible to measure the resistance in the secondary windings.