This task is performed by an inductive ignition system, the main part of which is the ignition coil (high voltage transformer).
Ignition voltage must be applied to each spark plug. To do this, in Audi A4 engines, ignition coils are mounted directly on the spark plugs (with built-in final stage). Thus, ignition sparks are produced without the use of a distributor. Replacement for a mechanical slider (rotor) electronic parts arrived at the ignition switch.
The exception is the 1.6l ALZ engine. This engine uses dual spark ignition with two ignition coils.
The principle of operation of the ignition coil
The ignition coil consists of a primary winding with relatively fewer turns and a secondary winding with several thousand turns of thin wire. A typical ratio between the number of turns is 1:100. The windings cover a lamellar iron core: the secondary winding is inside the core, the primary winding is outside. At the command of the control device, current is supplied to the primary winding through terminals 15 and 1 from the battery (low voltage). This creates a magnetic field, which is amplified by the iron core. If the control device interrupts the current circuit, then the magnetic field disappears at lightning speed for a few fractions of a second. In this case, a voltage of up to 400 volts arises. This voltage induces a high-voltage current pulse in the secondary winding, which is transmitted to the spark plug, and the ignition energy is discharged in the spark plug gap.
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