SsangYong Rodius (2013 year). Manual - part 78

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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 D20DTR 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 decresed.

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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EGR pipe

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

E-EGR valve

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

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.

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.

2) Location and Components

See the section "Engine control" for E-EGR 

valve control logic.

EGR cooler

EGR bypass

For details, see the section "Engine control".

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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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