SsangYong Rodius (2013 year). Service manual — part 65

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1. SYSTEM DESCRIPTION OF E-VGT
(Electric-Variable Geometry Turbine)

The E-VGT turbocharger has one shaft where at each ends are installed with two turbines having

different angles to connect one end of housing to the intake manifold and the other end to the exhaust

manifold. As the turbine, at exhaust end, is rotated by exhaust gas pressure the impeller, at intake end,

gets rotated to send air around center of the impeller, being circumferentially accelerated by the

centrifugal force, into the diffuser. The air, which has been introduced to the diffuser having a passage

with big surface, transforms its speed energy into the pressure energy while being supplied to the

cylinder improving the volume efficiency.

Also, the exhaust efficiency improves as the exhaust turbine rotates. The turbocharger is often referred

to as the exhaust turbine turbocharger.

Diffuser: With the meaning of spreading out it is a device that transforms fluid's speed energy into the

pressure energy by enlarging the fluid's passage to slow down the flow.

The E-VGT system installed to the D20DTR engine variably controls the passages of the turbine

housing to regulate the flow rate of the exhaust gas. The actuator of E-VGT is a DC motor actuator

(EActuator) which controls more quickly and precisely than the previous vacuum type actuator.