To the electronic control unit (ECU) the values of the optimal ignition timing for all operating modes of the engine have been introduced. Using the signals of sensors that measure the main parameters of the engine (engine speed, intake manifold absolute pressure, coolant temperature, etc.), microprocessor (ECU) instantly gives accurate ignition timing values.
Schemes of ignition systems
Contact ignition system.
Contactless ignition system; option without an electronic ignition timing control system.