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. In this case, the engine control unit is based on the field of ignition characteristics and additionally uses signals from various sensors. The synchronization of the ignition system is achieved by signals coming from a Hall sensor or an impulse sensor on the camshaft or crankshaft of the engine.
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 direction "late".
Direct ignition system
The distribution of the high ignition voltage to the individual spark plugs is carried out by electronic components, which are a replacement for the mechanical ignition distributor.
Elements of the ignition system do not wear out and do not require maintenance. Maintenance replacements only require spark plugs.
When working with an electronic ignition system, in order to avoid injury to people or damage to the system itself, it is necessary to observe the safety measures set forth at the beginning of this Chapter.
Location of ignition coils:
Engines up to 125 hp: The ignition system has 2 spark plugs per coil. Both ignition coils are fixed together in one housing on the cylinder head. The engine has 1.8 l / 125 hp. and a 1.6 liter engine, in addition, a powerful output stage is located in the ignition coil housing.
Engines with 1.8L turbocharger: 4 ignition coils are located directly on the spark plugs.
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