Description

DESCRIPTION

In order to further reduce NOx (nitric oxide) emissions, 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 sends it back into 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 modulated vacuum of the electromagnetic valve (2) controlled by the MOTRONIC control unit.

The amount of exhaust gas sent to the engine is defined by the MOTRONIC control unit, taking account of the characteristic curve of the E.G.R. command depending on the engine load and speed and on the coolant fluid temperature.

Through the MOTRONIC control unit, the electromagnetic 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 covered with thermal insulation.