The ignition system of a gasoline engine is an integral part of the engine management system. The ignition timing is determined by the engine management system. The engine management device is based on the ignition characteristic field and additionally uses signals from various sensors. Synchronization of the ignition system is achieved by signals coming from the Hall sensor or pulse sensor on the engine camshaft or crankshaft.
Anti-knock control ensures economical operation of the engine with a high compression ratio. To do this, the knock sensors transmit signals to the engine control unit, which, if necessary, shifts the ignition timing in the "late" direction.
Direct ignition system
Distribution of high ignition voltage to individual spark plugs is carried out by electronic elements, which are a replacement for the mechanical ignition distributor.
The ignition system components do not wear out and do not require maintenance. Only spark plugs require replacement during maintenance.
When working with the electronic ignition system, to avoid injury to people or damage to the system itself, it is necessary to observe the safety precautions described at the beginning of this Chapter.
Ignition coil locations:
Engines up to 125 hp: The ignition system has 2 spark plugs per coil. Both ignition coils are secured together in one housing on the cylinder head. The 1.8 l/125 hp engine and the 1.6 l engine additionally have a powerful output stage in the ignition coil housing.
1.8L Turbocharged Engines: 4 ignition coils are located directly on the spark plugs.
(This article was previously published on the resource: AudiManual.ru)