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To be operated, internal combustion engines require a system able to ignite the mixture of air and gasoline which is put into the engine and gets compressed inside of its cylinders. This is achieved by an electric spark that is set off in the spark plug, which ignites the mixture, thereby beginning combustion. There are different elements in such systems: a set of coils (monocoils), ignition wires, and DIS-type coils.
There are different types of ignition, and each corresponds to a different type of ignition coil:
The cyclical interruption of the primary is synchronised with the engine, at one rotation in two strokes (2T) or one for every two rotations in four strokes (4T), though there are 4T systems in engines with more than one cylinder, with a spark on each rotation (lost spark system, or DIS).
This interruption was formerly mechanical, performed by the contact breaker or disks, but today it is performed through an electronic circuit, with a power transistor which uses a controller associated with the running of the engine through an engine sensor.
It consists of two winding parts, the primary and secondary, with a loop ratio of approximately 1 to 1,000, with thicknesses inversely proportional to their lengths, and a ferromagnetic core. It is equipped with two connections for the primary, one for positive power from the engine ignition contact, and one for negative power connected to the cyclical interruption device of the primary. The secondary has a ground wire, and another for high voltage output to the spark plug or, where appropriate, to the distributor, and further along, to the engine spark plugs.
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