SsangYong Korando III (2010 year). Service manual — part 371

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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 sensor

(air mass)

CDPF

(7) Wide band oxygen sensor

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.

-

b. Components

D20DTF

ECU

EGR valve

Electronic

throttle body

Coolant temp.

sensor

Oxygen

sensor

Injector (C3I)

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c. Input/Output for oxygen sensor