AdBlue / DEF (Diesel Exhaust Fluid) is used in diesel vehicles to reduce harmful gases emission to air. It consist of 32.4% high purity urea and 67.6% deionized water. In USA AdBlue is known as DEF (Diesel Exhaust Fluid) whereas in Brazil it is known as ARLA32. Good quality AdBlue liquid is ISO-22241 certified.
AdBlue is very easy to use and is a harmless substance. It is not mixed with fuel. Vehicles with SCR technology has dedicated AdBlue tank. It should be refilled when required. Check out in detail about Bharat Stage 6 here.
SCR (Selective Catalyst Reduction) Technology
Selective Catalyst Reduction (SCR) technology is uses DEF liquid in BS6/Euro6 diesel engines. AdBlue / DEF in SCR converts harmful NOx in diesel exhaust into nitrogen gas and steam. After the implementation of Bharat Stage 6 norms in India. SCR system in exhaust will become mandatory in diesel vehicles.
Following are the main components of the SCR System:
- SCR Catalyst
- Injection Control Unit
- AdBlue Fluid injection Unit
- Tank For AdBlue
Vehicles with SCR technology has dedicated AdBlue tank. It is refilled when required. A typical car consumes approximately 1.5 ltr AdBlue liquid per 1000 km drive. But its consumption can be doubled depending on driving style, road and weather conditions.
Latest Mercedes Benz S-Class in India comes with 25 ltr AdBlue tank. Car instrument cluster also indicates when AdBlue top-up is required.
What will Happen if vehicle runs out of DEF/AdBlue Liquid ?
As per Euro6 and BS6 norms. Vehicle will not restart if it is run out of DEF/AdBlue Liquid. Tank need to be refilled with minimum 3.6 liter of AdBlue liquid.
What if AdBlue Liquid is added in Fuel Tank and vice-versa?
If accidentally AdBlue is filled in fuel tank or fuel to AdBlue tank. You should not start the vehicle and immediately call the service provider.
To sum up, AdBlue liquid is used in BS6 vehicles will SCR technology. It helps in reduction of NOx gases from exhaust gas. AdBlue is also known as DEF (Diesel Exhaust Fluid).
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