Читаем тут: 8. System of ignition
The system of ignition makes ignition of fuel mix in engine cylinders at some point depending on turns of the engine and loading. On cars many various types of systems of ignition are established.
The system of ignition eats from onboard network of the car. In the ignition coil tension of onboard network of the car will be transformed to high voltage. High voltage is used for formation of a spark between electrodes of spark plugs in engine cylinders in a compression step. The chain of low voltage or primary chain consists of an electrical wiring which connects the accumulator, the ignition lock, primary winding of the coil of ignition and the electronic block of ignition. The chain of high voltage or a secondary chain consists of a high-voltage winding of the coil of ignition, the central high-voltage wire, the distributor of ignition, a rotor of the distributor, high-voltage wires of spark plugs and spark plugs.
The coil of ignition will transform faltering current of low voltage (+12 V) to a high-tension current for breakdown of an air gap between electrodes of spark plugs. The coil of ignition represents the transformer with the opened magnetic conductor which consists of the internal core and an external ring magnetic conductor. The secondary winding having a large number of rounds is reeled up around the core. Primary winding with smaller number of rounds is reeled up over secondary.
The system of ignition works as follows. When giving tension on primary winding of the coil of ignition in the coil of ignition there is a magnetic field. For inclusion and switching off of tension given to primary winding of the coil of ignition the electronic block is used.
At switching off of tension on primary winding of the coil of ignition power failure of magnetic field in a secondary winding generates the high voltage which via the distributor of ignition moves to a candle of the corresponding cylinder. Then tension moves again to primary winding of the coil of ignition therefore magnetic field increases and the cycle is repeated for giving of high voltage to the following spark plug.