SsangYong Korando III (2010 year). Service manual - part 342

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

A turbocharger is a centrifugal compressor powered by a high speed turbine that is driven by an engine's 

exhaust gases. Its benefit lies with the compressor increasing the mass of air entering the engine (forced 

induction), thereby resulting in greater performance (for either, or both, power and efficiency). 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.

The E-VGT system installed to the D20DTF 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 (E-

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

The engine ECU controls the E-Actuator electronically as follows:

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.

At low speed: Narrows the flow passage for the exhaust gas, resulting in increasing the flow speed 

of the exhaust gas and running the turbine quickly and powerfully.

At high speed: Expands the flow passage for the exhaust gas, resulting in increasing the mass flow 

of the exhaust gas and running the turbine more powerfully.

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Maximizes the intake air charging efficiency (Approx. 15%)

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Optimizes the exhaust gas flow rate by controlling the vanes inside the turbine housing with the E-

Actuator.

1.

(2) E-Actuator (Electric-Actuator, Rotary type)

Target temperature and airflow control

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Enhanced emission control: By temperature control with CDPF system

1.

(1) Performance (for EURO V)

Has a faster response time than the conventional vacuum actuator

2.

Improved low speed torque, high speed power and fuel economy.

Improved acceleration performance with rapid response time of vane

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1) Features

Features

Benefits

Folding and unfolding of the vane 

is controlled electrically

Easy to get low speed air volume

Rapid response time

Electric control

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Improved low speed torque 

Improved low speed torque and 

power

Reduced exhaust gas

Improved fuel consumption

Improved acceleration 

performance

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E-VGT turbocharger

Improves engine power

T-MAP sensor

Boost pressure and 

temperature 

2. COMPONENTS

Engine ECU (D20DTF)

E-VGT duty control

Accelerator pedal position 

sensor 

Transfers accelerating demand 

to ECU

Atmospheric pressure, RPM 

signal

HFM sensor

Improves the engine power

Coolant temperature sensor

Operates the VGT according to 

engine warm-up 

For more information about control logic, refer to Chapter "Engine Control".