SsangYong Rodius (2013 year). Manual - part 90

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F. Features

As EGR ratio goes up, smoke volume will be 

higher. But, this lowers the combustion 

chamber temperature and accordingly the 

concentration of NOx is decreased. The point 

with highest NOx is immediately after TDC.

As EGR temperature goes up, the 

concentration of NOx will be higher. Thus, it is 

necessary to cool down the exhaust gas. 

However, during engine cooled, it may cause 

large amount of PM. To prevent this, the 

exhaust gas is bypassed the EGR cooler.

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(10) E-VGT control

A. Overview

E-VGT (Electric-Variable Geometry Turbine) turbocharger system in D20DTR engine uses the venturi 

effect that controls the flow rate of exhaust gas by adjusting the passage in turbine housing. The newly 

adopted DC motor actuator (E-actuator) controls the E-VGT system more precisely and faster. To get 

the high operating power from turbine, the ECU reduces the exhaust gas passage In low speed range 

and increases it in high speed range.

B. Components

HFM (intake air 

temperature)

Front EGT 

sensor

E-VGT actuator

Accelerator pedal 

module

Crankshaft 

position 

sensor

Oxygen sensor

T-MAP sensor

Coolant 

temperature 

sensor

D20DTR ECU

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C. Input/Output for E-VGT system

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D. E-VGT system control

Turbocharger system operates the E-VGT actuator according to the signals for engine epm, 

accelerator pedal position, atmospheric pressure, T-MAP, coolant temperature and intake air 

temperature. 

Turbocharger actuator is performed PWM control by ECU. 

In general, the boost pressure feedbacks the turbocharger operation and the boost temperature is 

used for calculating the precise density.

E-VGT provides higher engine power with faster reaction speed compared to conventional VGT.

Operating wave

Vane

Control

Low 

speed 

range

In low speed range: 
retract the vane to 
increase boost 
pressure. The vane 
has low (-) duty, and 
the unison ring 
moves to retract the 
vane in weak PWM 
signal. 

High 

speed 

range

The unison ring 
moves to extend the 
vane in strong PWM 
signal. Maximum 
pressure is 3 bar and 
the system controls it 
according to the input 
signals.