Emission Aftertreatment System; Catalytic Converter & O2 Sensor; Purge Canister Control; Blow-By Gas Control System (Crankcase Ventilation System) - SSANGYONG Korando 2012 Manual

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This system purifies the exhaust gas generated by the combustion in the engine to reduce the pollutants

and noise during that arise during combustion.

Harmful materials produced in the combustion process is treated and reduced in the exhaust system.

Harmful materials discharged from the crankcase and fuel tank is drawn into the intake system again to

reduce discharge amount of harmful materials.

Emission aftertreatment system

Catalytic Converter & O2 Sensor

The catalytic converter is a monolith type purification system composed of cordierite which purifies

exhaust gas through the small holes of active monolith catalyst from the exhaust manifold. As exhaust

gas passes through the small holes in the layer in the middle, its CO and HC are reduced by

oxidization reaction and its NOx is reduced by reduction reaction to Pt, Ph and Pd. The oxygen

sensor sends signals for feedback and determination of catalyst condition. For detailed description,

see the corresponding section.

The fuel evaporative gas is a gas evaporated to the atmosphere in the section between the fuel tank and

fuel line, and its main component is hydrocarbon (HC). The fuel evaporative gas is temporarily stored in

the canister, and it is drawn to the engine through the throttle body when the purge control solenoid valve

is open according to the engine operating condition.

Gas in the combustion chamber is sealed by the piston. However, gas is leaked through the gap

between the cylinder and piston and drawn into the crankcase during the compression and explosion

strokes. This gas is blow-by gas and its main components are hydrocarbon and carbon monoxide. If this

gas is drawn into the crankcase, the system can be corroded and oil can be deteriorated. Also, if this

gas is discharged into the air, it can pollute the environment. To prevent these, the blow-by gas

reduction system (also called as crankcase ventilation system) draws the blow-by gas from the

crankcase to the combustion chamber for combustion.