Ignition system (K4J engine). 1 - Ignition coil, 2 - Spark plug, 3 - Magnetic sensor (BMT and Speed).
Ignition system (K7J engine). 1 - Ignition coil, 2 - gearbox, 3 - Magnetic sensor (BMT and Speed).
The ignition system ensures reliable ignition of the mixture in the engine cylinders in all operating modes. The ignition timing is selected by the injection control unit according to the signals from the sensors of the mixture control system.
Ignition system with static distribution of high voltage across the spark plugs. The fuel injection system and the ignition system work together, controlled by one ECU, and form an integrated engine management system. The ignition system under consideration makes it possible to eliminate all moving elements in the ignition system.
Ignition coils (four, according to the number of cylinders) are fixed directly on the candle with a bolt on the cylinder head cover.
Ignition coil brand Nippondenso, primary winding resistance (0,5±0,02) Ohm, secondary winding (6,8±1) kOhm
The applied technical solution allows to increase the amount of energy at the level of spark plugs due to the elimination of all intermediate links between the spark plug and the coil.
Spark plugs are equipped with three electrodes (two side and one «mass»).
The crankshaft position sensor generates signals about the position and speed of rotation of the crankshaft. An electronic control unit, shared with the fuel injection system, processes these signals and instructs the ignition coils mounted on each spark plug to deliver a spark according to the principle of two-spark ignition, i.e. in one engine cycle, the spark appears twice - in the same compression and exhaust stroke. The ECU, processing signals from various sensors, controls the duration of the ignition pulse and the ignition timing, acting as necessary on the primary windings of the ignition coils.
The knock sensor installed on the cylinder block sends a corresponding signal to the ECU based on vibrations and knocks in the cylinders, which delays the control pulse of the ignition unit, reducing the lead until detonation stops. In this way, an optimal moment of fuel combustion is created, as close as possible to the detonation threshold and ensuring the best engine performance.
In the ignition system used, the ignition timing is determined by the ECU based on a combination of engine operation parameters. It is impossible to change the ignition timing on your own, with the help of diagnostic equipment you can only determine the correctness of its installation.