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1.5L REVOTORQ ENGINE
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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.