Description of system

DESCRIPTION OF SYSTEM

1. E.G.R. valve
2. E.G.R. modulation solenoid valve
3. Exhaust gas takeoff pipe
4. Exhaust collector
5. Air intake box

To further reduce emissions of NOx (nitric oxides) the supply system is fitted with an E.G.R. valve (1). The E.G.R. valve (Exhaust Gas Recirculation) withdraws part of the exhaust gas and returns it to the intake box (5), where it is mixed with the intake air and burnt in the engine. The E.G.R. valve is operated by the vacuum modulated by the solenoid valve (2) controlled by the MOTRONIC control unit.

The amount of exhaust gas sent to the engine is determined by the MOTRONIC control unit, taking account of the characteristic curve of the E.G.R. control depending on the engine load and speed and on the temperature of the coolant fluid. Through the MOTRONIC control unit the solenoid valve modulates the vacuum to be sent to the E.G.R. valve for opening. The stainless steel exhaust gas takeoff pipe (3), is fitted with an expansion compensation bellows and is covered with a screening braid.