SsangYong Rodius (2013 year). Service manual — part 66

06-18

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

EActuator.

1.

(2) E-VGT Actuator (Electric-Actuator)

Target temperature and airflow control

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Enhanced emmission 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 and

power

Reduced exhaust gas

Improved fuel consumption

Improved acceleration

performance

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06-19

1914-01

2. COMPONENTS

Atmospheric pressure, RPM

signal

* For details about control logic, refer to Chapter “Engine Control”.

E-VGT turbocharger

Improves engine power

Accelerator pedal position

sensor

Transfers driver's will to
accelerate to ECU

Engine ECU (D20DTR)

E-VGT duty control

Coolant temperature sensor

Operates the VGT according to
engine warm-up

T-MAP sensor

Improves the engine power

HFM sensor

Booster pressure and
temperature

06-20

3. INPUT/OUTPUT DEVICES

06-21

1914-01

Control

range

Turbocharger

driving

mechanism

Control

method

Effect

Improved

performance

At low

speed

Narrows the
flow passage for
the exhaust gas
by folding the
vanes

The flow rate is
increased as the
exhaust gas passes
the narrow passage
→ Increased
turbine & impeller
speed, Increased
compressive force

Improved

low speed torque

4. OPERATING PRINCIPLES

The E-VGT is designed to get more improved engine power in all ranges by controlling the turbine as

follows:

1) How it Works at Low Speed

Normal turbocharger cannot get the turbo effect because the amount of exhaust gas is not enough

and the flow speed is slow in a low speed zone, but VGT allows the flow passage of exhaust to narrow,

resulting in increasing the flow speed of exhaust gas and running the turbine quickly and powerfully.

Therefore, as VGT can intake more air than normal turbocharger, it can give the benefit of the

increased output even in a low speed zone.

Turbocharger lag

The turbocharger is at idle speed when there is no load or it is in the normal driving condition. During

this period, the amount of exhaust gas passing through the turbine is not enough to turn the

compressor wheel (impeller) fast. Therefore, the intake air is not compressed as needed. Because

of this, it takes time for turbocharger to supply the additional power after the accelerator pedal is

depressed. This is called "turbocharger lag".

Basic principle at low speed

At low speed, it utilizes the principle of venturi.

For example, when air flows through the venturi

tube, the flow speed is faster and the pressure

is lower at the point "A". In this case, if the inner

diameter of venturi is more narrowed, the flow

speed is so much faster (refer to the equation).

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