NEXON

1.5L REVOTORQ ENGINE

Components

A. Electronic Control Unit

The EGR system of the vehicle is controlled by the

Engine EMS ECU.

Block Diagram

The EMS ECU controls the EVRV which in turns

controls the EGR by applying vacuum or releasing it

as per the signal from the EMS ECU.

B. EGR Valve

The EGR valve is a diaphragm valve that is

actuated by vacuum from the Vacuum pump

through EVRV. The valve is mounted on the

cylinder head. It has three connections, one for the

vacuum, and one for the exhaust gas inlet from the

cylinder head and one for the exhaust gas outlet to

the inlet manifold. The valve opens to allow the

Exhaust gas to re-circulate to the intake manifold.

C. EVRV (Electronic VacuumRegulating Valve)

The EVRV is an electro pneumatic solenoid switch,

which is controlled more precisely by the EMS ECU

based on the Engine speed, Coolant Temperature

and Accelerator pedal position etc. EVRV provides

variable vacuum levels to drive the EGR & TC.