The ignition system includes spark plugs, high-voltage wires, a distributor (ADP engines), electronic ignition coils and electronic control unit (BEU) with appropriate sensors, actuators and wiring. The basic principle of the system is as follows: from the BEU, the voltage is supplied to the primary winding of the ignition coil. The incoming voltage is interrupted by the BEC, which causes a change in the magnetic field of the coil, due to which a voltage called high is induced in the secondary winding (coil-step-up transformer). This voltage is supplied to the spark plugs through the high-voltage wires in accordance with the compression stroke. There is a small gap between the electrodes of the spark plug, in which an electric arc occurs, igniting the air-fuel mixture in the cylinder. The moment of occurrence of a spark between the electrodes of the candle is very critical and is determined by a command from the BEU.
The ECU determines the ignition timing by processing signals from the engine speed sensor, crankshaft position sensor, throttle position sensor, intake air temperature sensor, which are installed in various places in the engine. Ignition timing is also affected by coolant temperature and engine knock, for which appropriate sensors are provided. On all engines, the initial ignition timing is also determined by the signals of the Hall sensor installed or in the distributor (ADP engines) or at the front end of the intake camshaft.
The knock sensor is mounted on the cylinder block, it determines the moment of the onset of detonation before it is heard. According to his signals, the BEU delays the ignition, making it later, thus excluding the onset of detonation combustion and keeping it on the verge of the onset of detonation.
On all engines except those equipped with the Simos system. idle control is partly done by a throttle position module mounted on the throttle body and partly determined by the ignition system more finely controlling idle by varying the ignition timing. In the Simos system, the ECU controls idling by changing the ignition timing and injection duration. Manual idle control is thus neither necessary nor provided.
It should be noted that a serious troubleshooting in the system is impossible without the use of specialized diagnostic equipment. Therefore, in the event of a malfunction in the system that is not discussed in paragraph 2, it is necessary to seek help from the dealer. When determining a fault, the defective assembly can be replaced using the detailed information given in the following paragraphs.
Note: In this chapter, vehicles are identified according to the engine model code and size - a list of engines is given in chapter 2A.
Visitor comments