The ignition system includes two ignition coils (A and B), which have built-in power transistors. One of the coils serves cylinders No.1 and No.4, the other - cylinders No.2 and No.3. At the moment of interruption of the current of the primary winding of ignition coil A, high voltage is induced at the terminals of its secondary winding. High voltage is simultaneously supplied to the spark plugs of the first and fourth cylinders. At this moment, the compression stroke occurs in one of the cylinders, and the exhaust stroke in the other. Therefore, ignition of the fuel-air mixture occurs only in the cylinder in which compression occurs. Similarly, at the moment of interruption of the current of the primary winding of ignition coil B, high voltage is supplied to the spark plugs of the second and third cylinders.
The engine ECU (cars with a manual transmission) or the engine and automatic transmission ECU (cars with an automatic transmission) controls the switching on and off of two power transistors built into the ignition coils. The transistors, in turn, control the current of the primary windings of the ignition coils and ensure timely ignition of the working mixture in the engine cylinders. The firing order of the cylinders is 1–3–4–2.
The engine ECU (cars with a manual transmission) or the engine and automatic transmission ECU (cars with an automatic transmission) set the moments of spark formation and the sequence of switching on the power keys based on signals from the camshaft position sensor installed on the camshaft and the crankshaft angle sensor installed on the crankshaft. Depending on the engine operating mode. These ECUs change the value of the actual ignition timing angle. If the engine is not warmed up to operating temperature or the car is at a high altitude above sea level, the ignition timing angle increases slightly (towards advancement).
At the moment of gear shifting, the ignition advance angle is slightly reduced to reduce torque. At the same time, the gear shifting process occurs more smoothly.
Data for monitoring and adjusting the ignition coil
Spark plugs
High voltage wires with distributed resistance
Special tools and accessories
Ignition Coil Characteristics
Spark plugs
