printable version

Ignition system

The ignition system produces in each cylinder of the engine at the desired point in time spark. The spark ignites the fuel-air mixture. In the ignition coil to the battery voltage of 12 V converted into a voltage in excess of 30,000 V. Diesel engine ignition system does not have as its high degree of compression of the air is heated so that the injected fuel is ignited by itself.

All the petrol engines and fuel-injected engine capacity of 1.4 liters equipped with a transistor ignition system. Engines with fuel injection system equipped with an electronic ignition system. The ignition system consists of:

• spark plugs
• ignition cables
• ignition coils
• distributor of ignition with a runner, a Hall sensor and control unit

Generated in the ignition coil voltage is fed through the slider of the distributor and ignition cables to the corresponding spark plugs. On the electrodes of spark jumps the spark that ignites the fuel-air mixture in the cylinders. The ignition timing by increasing the rotational speed to be automatically displaceable in the direction of early ignition. This shift in the transistor ignition system is carried out in the distributor due to centrifugal weights and by vacuum (vacuum hose from the intake pipe to the ignition distributor). In an electronic ignition system built into valve microprocessor calculates the optimum ignition timing depending on engine speed and engine load level. Furthermore, the processor will disable ignition. The task distributor is to distribute the current of the ignition in a predetermined order between the cylinders, and by means of a Hall sensor to issue information on the number of revolutions and the ignition timing in the ignition control device.

Engines with fuel injection system equipped with an electronic ignition system. Ignition control device is integrated with the injection control unit. The microprocessor controls the ignition timing on the basis of memory recorded in his field characteristics.

The ignition system of parametric optimum ignition timing depends on the condition of the engine. As parameters are RPM, engine temperature and degree of load (throttle position and intake air amount). This refers to the momentary engine load, since there is a difference if a car with a speed of 4000 rev / min up the hill or down the mountain.

Necessary characteristics for ignition systems identified during the test on the stand, and then agreed with tests under real conditions, so that the optimal value is achieved in fuel consumption, exhaust gas composition and driving quality. Thus defined the value stored in the memory of the control unit.

When work on the ignition system should comply with the security measures.