TIAGO

1.05L REVOTORQ ENGINE

Components :

A. Electronic Control Unit :

The EGR system of the vehicle is con-

trolled 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 inlet

manifold. It has three connections, one for the vac-

uum, and one for the exhaust gas inlet from the

exhaust manifold 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 so-

lenoid 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.