Citroen Xantia

Since 1993 of release

Repair and car operation

Ignition system - petrol models

The ignition system on a level with system of injection of fuel is the component of a control system of the engine operated uniform ECU (see the Head of the Power supply system and release more in detail). On the majority ignition is organised under the scheme without the distributor. The basic component of system is the ignition module (DIS).

Module DIS represents the coil of ignition with four conclusions and consists of two separate ВВ coils, each of which provides fuel ignition in two cylinders of the engine (one winding in cylinders 1 and 4, the second - 2 and 3). The principle of a "single" spark when each of spark plugs generates a spark twice for a piston running cycle - once in the end of a step of compression and the second on a final step is put In a basis of functioning of the module. ECU control systems of the engine on the basis of the information received from various gauges are carried out by the constant control over installation of a corner of an advancing of ignition and the period of a charge of the coil.

On l models 2.0 the detonation gauge is included in structure of system of ignition. The gauge is established on a head of cylinders and informs ECU on occurrence of a detonation of fuel in the engine at loading increase. The gauge reacts to change of intensity of vibrations, revealing thereby the moment when ignition becomes too early. ECU immediately gives out a command on corresponding updating of a corner of an advancing (towards delay), eliminating thereby all negative phenomena.