312000288 - INTRODUCTION - FUEL TANK AND PIPES
This fuel injection system uses an electronically-controlled high injection pressure and a fuel delivery method produced by one main injection and one or more pilot injections (depending on the engine operating conditions), electronically-controlled by the injection control unit via the injector; this system is capable of carrying out up to five injections (depending on the actual engine operating conditions).Pressure level is one of the basic parameters for optimising fuel consumption and exhaust fume levels.Controlling the ignition by means of several pilot injections makes it possible to preheat the combustion chamber to avoid the pressure peak caused by rapid combustion and ensure smoother running with a further reduction in emissions.Injection pressure adjustment is made possible by the construction features of the system, which is equipped with a separate pressure pump, pressure regulator, pressure sensor and injectors, all managed by a control unit. In this way, injection pressure is independent of engine rotation speed.The main features of the fuel supply system are as follows:
- high injection pressure (up to 1400 bar);
- injection pressure that can be modulated from 150 to 1400 bar under all engine operating conditions;
- introduction of fuel up to 50 mm3/cycle within a speed range of 100 to 5200 rpm;
- precise injection control in terms of advance and duration;
- one or two pilot injections before TDC, managed on the basis of rpm and engine load, which allow the pressure in the combustion chamber to be distributed more evenly with a reduction in noise levels.
The low pressure circuit consists of:
- an auxiliary pump immersed in the tank;
- the fuel filter with an internal cartridge;
- the fuel return manifold pipe;
- the connecting pipes.
The high pressure circuit consists of:
- the pressure pump;
- the single fuel manifold pipe with built in pressure regulator and pressure sensor;
- the injectors;
- the connecting pipes.
