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Diesel Exhaust Fluid in BS6 SCR Diesel Car. NOX Trap Explained

Diesel Exhaust Fluid in BS6 SCR Diesel Car. NOX Trap Explained

BS6 Diesel Cars gets a major Upgrade with Diesel Exhaust Fluid introduced in SCR Technology. Difference with NOX Trap Explained in BS6 Cars


BS6 Diesel Cars - SCR

Air Pollution is what the biggest concern Globally and thus are Automobile Engineers across World are innovating towards Lower Emission Cars as one of the main KRA 

The Major Reason for upgrading from BS4 to BS6 is to reduce Emissions by cutting out Carbon Monoxide, PM, NOX Levels. As estimated the reduction of Harmful Pollutants like NOX reduced to 1/3rd from BS4 to BS6 and PM by 1/5th from BS4 to BS6

Emission Norm standard - Diesel Cars
Nox  (milligram/km) PM  (milligram/km)
BS 3 500 50
BS 4 250 25
BS 6 (estimated) 80 5

While PM Levels are considerably reduced by using Diesel Particulate Filter in BS6 Cars, NOX Levels are reduced in BS6 Cars using 2 Ways

  • Selective Catalytic Reduction (called as SCR Technology)  as the most Effective Way
  • Alternate is NOX Trap which is relative economical way 


SCR Technology in BS6 Diesel Cars - Diesel Exhaust Fluid

Here, Diesel Exhaust Fluid is what used in Cars with SCR (Selective Catalytic Reduction) to reduce NOX Pollutants. A Diesel exhaust fluid is what Combination of Urea and Deionized Water. 

DEF (or essentially Diesel Exhaust Fluid) is stored in separate tank which has capacity ranging from 12 Litre to 15 Litre and used in SCR to reduce NOX Pollutants by converting them to water Molecules

This is the best way to reduce in NOX Pollutants and used in across World. Some Companies uses name as Ad-Blue as against Diesel Exhaust Fluid. Effectively, below BS6 Diesel Car Range uses Diesel Exhaust Fluid / Adblue

  • Tata Harrier
  • Jeep Compass
  • Toyota Innova Crysta
  • Isuzu MUX
  • Upcoming BS6 Diesel Cars from Mahindra as Scorpio, XUV500, Alturas (to be introduced from April 2020)
  • Toyota Fortuner
  • Ford Endeavour
  • Mercedes Benz
  • BMW Diesel Cars

and all other Performance Cars uses Diesel Exhaust Fluid. To be noted that

  • Maruti Suzuki Discontinued all Diesel Cars 
  • Renault India Discontinued all Diesel Cars
  • Volkswagen, Skoda, Audi all to be only come with BS6 Petrol Cars from April 2020 and no Diesel Cars will be in Portfolio



Lean NOX Trap - Alternate way

NOX Trap as alternate easier way is also used for reducing in NOX Pollutants. They do not used SCR Technology. However, globally proven Lean NOX Trap has relatively higher Pollutants as against Cars with SCR Diesel Technology. Heard of Volkswagen Diesel Scandal - they were using NOX Trap where although Diesel Car Emissions were lower in test conditions, but higher in real world. Ofcourse, some more malpractice were there

In NOX Trap - there is no Diesel Exhaust Fluid used, but rather NOX is stored at in NOX Storage Catalyst and with Combustion Management is what NOX breaked down.

NOX Trap is used in BS6 Diesel Cars in India as

  • Hyundai Grand i10 Nios Diesel, Aura Diesel
  • Ford 1.5 TDCI Diesel Engine as used in Figo, Aspire, Ecosport
  • Honda 1.5 IDtec Diesel Engine as used in Amaze, Jazz, WRV
  • Kia Seltos 1.5 Diesel
  • Hyundai Verna 1.5 Diesel, Creta 1.5
  • Tata Altroz Diesel, Nexon Diesel


Important for Owner Perspective - Diesel Exhaust Fluid

If you are buying a Car with Diesel Exhaust Fluid, well DEF has a capacity ranging from 12 Litre to 15 Litre and stored in a separate Tank. Important to note that DEF has a life Cycle to it which can range from 10,000 to 15,000 Kms - basis tank capacity, basis car Mileage

Once DEF quantity is limited to 600 Kms, a warning signal will appear on Instrument Cluster stating DEF Low and needs to be refilled.

Its utmost important as DEF Relevance is equally as important as what like Petrol / Diesel in a Car

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Tuesday, 20 October 2020

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