SsangYong Korando III (2010 year). Manual - part 66

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1. SYSTEM DESCRIPTION

1) Overview

The EGR (Electric-Exhaust Gas Recirculation) valve reduces the NOx emission level by recirculating 

some of the exhaust gas to the intake system.

To meet Euro-V regulation, the capacity and response rate of E-EGR valve in D20DTF engine have 

been greatly improved. The EGR cooler with high capacity reduces the Nox, and the bypass valve 

reduces the CO and HC due to EGR gas before warming up.

Also, the engine ECU adjusts the E-EGR opening by using the air mass signal through HFM sensor. If 

the exhaust gas gets into the intake manifold when the EGR valve is open, the amount of fresh air 

through HFM sensor should be decreased.

Benefits of E-EGR valve

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Improved accuracy and response through electric control

Feedback function (Potentiometer)

Preventing chattering of EGR valve and improved durability

Self-cleaning function

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2) Location and Components

HFM sensor

Used as a main map value to control the EGR. 
The coolant temperature, engine rpm, engine 
load, intake air temperature (HFM: decreased at 
60˚C or more), atmospheric pressure 
(atmospheric pressure sensor: altitude 
compensation) are used as auxiliary map values.

EGR pipe

Transports the exhaust gas from the EGR cooler 
and EGR bypass valve to the intake duct.

E-EGR cooler and bypass valve

The cooler lowers the high temperature of the 
exhaust gas and the bypass valve directly 
supplies the exhaust gas to the intake duct 
without passing through the EGR cooler to 
reduce the emission of exhaust gas before 
warming up the engine.

E-EGR valve

Receives the electric signal from the ECU to 
control the valve.

EGR cooler

EGR bypass

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2. OPERATING PROCESS

1) Schematic Diagram

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2) Input/Output Devices

3) Control Logic

The EGR system controls the EGR amount based on the map values shown below: 

Main map value: Intake air volume

Auxiliary map value:

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Compensation by the coolant temperature

Compensation by the atmospheric pressure: Altitude compensation

Compensation by the boost pressure deviation (the difference between the requested value and the 

measured value of boost pressure)

Compensation by the engine load: During sudden acceleration

Compensation by the intake air temperature

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The engine ECU calculates the EGR amount by adding main map value (intake air volume) and auxiliary 

map value and directly drives the solenoid valve in the E-EGR to regulate the opening extent of the EGR 

valve and sends the feedback to the potentiometer.

(1) Operating conditions

Intake air temperature: between -10 and 50℃

Atmospheric pressure: 0.92 bar or more
Engine coolant temperature: between 0 and 100°C 

When there is no fault code related to EGR  

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(2) Shut off conditions

Abrupt acceleration: with engine speed of 2600 rpm or more

When the engine is idling for more than 1 minute

Vehicle speed: 100 km/h or more

Engine torque: 380 Nm or more

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