3234584 - E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT - Description

Description

An electronic management system supervises and governs all engine parameters. It optimises performance and fuel consumption by responding in real time to different service conditions.The Diesel engine is fitted with a COMMON RAIL UNIJET injection system. This features the use of high, electronically-controlled injection pressure. Fuel delivery, termed a pilot injection, is optimised by the electronic control unit via the injector and not managed by the pump.The common rail injection system on this version with 4 valves per cylinder uses MULTIJET technology: i.e. during each engine cycle it carries out more than the usual two injections: it carries out two pre-injections (before the piston is at TDC), one main injection and two post-injections.This solution improves consumption, emissions, quietness and performance because it allows better control of the temperature in the combustion chamber, lowering the maximum value and extending the optimum combustion zone.

The system uses signals received from numerous sensors to control actuators. It is connected to the following systems:

• fuel supply;
• air supply system;
• heater plugs;
• accelerator pedal;
• engine cooling;
• fuel preheating.

For greater detail, see  Characteristic of working principle 1060  DIESEL FUEL INJECTION . Starting from September 2003Thanks to the electronic management described above, this engine conforms to the latest anti-pollution and continuous control regulations in accordance with the EOBD system (European On Board Diagnosis); The EOBD (European On Board Diagnosis) system carries out continuous diagnosis of the car's petrol fuel system components relating to emissions and indicates any deterioration of these components by the warning light in the instrument panel coming on.

The aim of the system is:

• keeping the efficiency of the system under control;
• signalling an increase in emissions due to a vehicle malfunction;
• signalling the need to replace components which have deteriorated.

The system is also controlled by means of special relays located in the engine compartment near the battery.The supply lines to the control unit and the various system components (sensors and actuators) are protected by a specific maxifuse and by other jumper fuses, located in the additional fuse box.The heater plugs are protected by a special maxifuse, located near the battery.