SsangYong Actyon Sports II. Manual - part 59

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(10) E-VGT control

A. Overview

E-VGT (Electric-Variable Geometry Turbine) turbocharger system in D20DTF 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.

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HFM (intake air 

temperature)

CDPF

Electric throttle 

body

Coolant 

temperature 

sensor

Oxygen sensor

Injector (C3I)

E-EGR valve

(11) Wide band oxygen sensor control

A. Overview

For diesel engine, combustion is not performed at the optimum (theoretically correct) air-fuel ratio and 

the oxygen concentration is thin in most cases. So the wide-band oxygen sensor is used for this kind of 

engine, and this sensor is a little different from the one that used for gasoline engine. The combustion in 

diesel engine is controlled by fuel injection volume. Therefore, the wide band oxygen sensor should be 

used in diesel engine. This sensor measures the air-fuel ratio in very wide range, and is also called full 

range oxygen sensor.

The wide band oxygen sensor measures the oxygen density in exhaust gas and sends it to ECU to 

control the EGR more precisely.

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B. Components

D20DTR ECU