What is mean by BS6(BS6 Technology)

BS6 norms aims at reducing three pollutants HC + NOx, PM and NOx reduction by 43, 68 and 82 percent respectively for diesels vehicles. And  25 percent of NOx numbers from 80mg/km to 60mg/km for petrol vehicles.

Area of implementation in diesel vehicle:
  • SCR (Selective Catalytic Converter)
  • DPF (Diesel Particulate Filter)
  • DOC (Diesel Oxidation Catalyst) LNT (Lean NOx Trap)
  • AdBlue
Area of implementation in petrol vehicle:
  • In gasoline direct injection (GDI) engine, very least changes
    • Adjustment of actuator
    • Exhaust catalyst solution
  • GDI particulate filter
  • Small in size and higher in power engines

For Example:

The best example is the 1.0-litre GDI engine in the recently launched Hyundai Venue which belts out 118 bhp and 172 Nm of peak torque. The engine is small in size compared to the 1.2-litre, four-cylinder unit in the Venue but is more powerful. The 1.2-litre engine in the Venue puts out 89 bhp and 115 Nm of peak torque.

How can reduce PM (particulate matter) ?

BS6 diesels will release less particulate matter (PM) upon combustion. Studies suggest that a BS4 compliant diesel vehicle running on BS6 fuel could cut down PM emissions in half. Conversely, a reduction in sulphur content can lower the energy content of the fuel, bringing down the fuel efficiency, however marginally.

Component used to reduce PM from Exhaust system
What is SCR (Selective Catalytic Converter):

Selective Catalytic Reduction (SCR) is an advanced active emissions control technology system that injects a liquid-reductant agent through a special catalyst into the exhaust stream of a diesel engine. The reductant source is usually automotive-grade urea, otherwise known as Diesel Exhaust Fluid (DEF).

Component of SCR from Exhaust system
  • Diesel Oxidation Catalyst
  •  NOx Sensor
  • AdBlue
What is LNT(Lean NOx Trap) & DOC (Diesel Oxidation Catalyst)?

The exhaust from the engine flows through the LNT.2 catalyst. This catalyst oxidizes HC and CO efficiently. In addition the catalyst traps NOx under lean engine operation conditions. Trapped NOx is released from the catalyst when the engine operation mode is switched to rich conditions. During rich regeneration, the NOx is converted into N2, and NH3 (ammonia) is generated over the LNT.2.

Component used for LNT and DOC:
  •  Temperature sensor US & DS LNT
  •  Well calibrated air system for lean-rich transition
  •  On one substrate a DOC and LNT are combined, and it is placed in front of SCR.
Can a BS4 vehicle run on BS6 fuel ?

The answer is yes. In theory, a BS4-compliant vehicle can run on BS6 fuel without any issues, especially if it’s a petrol car. In diesel engines, the sulphur content in the fuel acts as a lubricant for the fuel injectors. BS6 fuel has five times less sulphur content in comparison to BS4 fuel.

What are the difficulties with BS6 implementation in India?

After 3 years and skipping BS5 stage, This gave the automobile manufacturers very little time to do their research and development for new BS6 compliant engines.  The emission norms in the country need to be checked whether the car is BS3, BS4 or BS6 compliant. Which in our county is highly unlikely. People have to visit a PUC centre after every 3-6 months. In many cases either the equipment is not checked properly or it is not properly calibrated. In any of the cases, it is defeating the whole purpose of the Pollution Check Certificate.

BS6 has been discontinued from 1st April 2020. What’s next?

By now it is clear that the new exhaust emission norms are kicking in. The new engines developed in compliance with new exhaust emission norms have a lot to offer. The new engines are as high as 70% more environment friendly. Exhaust emission such as NOx (Nitrogen Oxides), SOx (Sulphur Oxides), COx(Carbon Oxides) has been reduced. All the pollution check certificates will be issued as before.

BS6 vehicles available in market:

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