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, a high voltage is induced at the terminals of its secondary winding. High voltage is simultaneously applied to the spark plugs of the first and fourth cylinders. At this point, one of the cylinders is on a compression stroke, and the other is on an exhaust stroke. Therefore, the ignition of the air-fuel mixture occurs only in the cylinder in which compression occurs. Similarly, at the moment of interruption of the current of the primary winding of the ignition coil B, a high voltage is applied to the candles of the second and third cylinders.
Engine ECU (vehicles with manual transmission) or engine ECU and automatic transmission (vehicles with automatic transmission) controls the on and off of two power transistors built into the ignition coils. Transistors, in turn, control the current of the primary windings of the ignition coils and ensure the timely ignition of the working mixture in the engine cylinders. The order of operation of the cylinders is 1–3–4–2.
Engine ECU (vehicles with manual transmission) or engine ECU and automatic transmission (vehicles with automatic transmission) set the moments of sparking and the sequence of turning on the power switches according to the signals of the camshaft position sensor mounted on the camshaft and the crankshaft angle sensor mounted on the crankshaft. Depending on the operating mode of the engine. These ECUs change the value of the actual ignition reflection angle. If the engine is not warmed up to operating temperature or the car is at a high altitude above sea level, then the ignition timing increases slightly (in the direction of advance).
At the moments of gear shifting, the ignition timing is slightly reduced to reduce torque. In this case, the process of shifting gears is smoother.
Data for monitoring and adjusting the ignition coil
Spark plug
High voltage wires with distributed resistance
Special tools and fixtures
Characteristics of the ignition coil
Spark plug
