An electronic control system supervises and governs all engine parameters to optimise performance and fuel consumption by means of a real-time response to different operation conditions.Diesel engines are equipped with a COMMON RAIL type injection system.This features the use of an electronically controlled high injection pressure. The supply of fuel, known as the pilot injection, is optimized by the electronic control unit by means of the injector, rather than being managed by the pump.In this 4 valve per cylinder version, the common rail injection system uses Multijet technology: during each engine cycle, in addition to the two normal injections, it carries out two pre-injections (before the piston is at top dead centre), one main one and two post-injections.This solution improves fuel consumption, noise levels and performance because it allows better control of temperature in the combustion chamber by lowering the maximum value and extending the optimum combustion area.Depending on the signals received from numerous sensors, the control unit controls the injectors connected to it, managing the following systems:
fuel supply;
air supply;
glow plugs;
accelerator pedal;
engine cooling;
emission control (Lambda sensor).
To respect the latest emissions control regulation (EURO 4), the most recent electronic on-board management version is used, comprising new components (injectors, pressure regulator and high pressure pump, digital debimeter) and the adoption of a lambda sensor.For further details, See descriptions 1060 DIESEL INJECTION SYSTEM The system is also controlled by dedicated relays in the engine compartment junction control unit. Lines supplying the control unit and various system components (sensors and actuators) are protected by dedicated fuses that are also located inside the engine compartment junction unit.