24SIAT-0899: After-Treatment Improvement in Mahindra BS VI Stage-1 to Stage-2 2024-26-0148

Effective 1^st April 2023, India's automotive emissions regulation has shifted from BS-VI Stage-1 to BS-VI Stage-2 standard the after-treatment systems need to demonstrate robust performance not just on the cycle, but also to demonstrate emissions for on-road Real Driving Emission (RDE) conditions. A stringent On-Board Diagnostics (OBD) strategy to monitor the real-time emission levels along with compliance Road Driving Emissions (RDEs) are focus areas for BS VI Stage-2 emission legislation. The maximum speed on MIDC is 90km/h in BS-VI Stage-1, Diesel Oxidation Catalyst (DOC)+Selective Catalyst Reduction Filter (SCRF^®) was able to meet legislation at the lab, and now with the RDE cycle max speed of the vehicles under the M1 category <3.5 T will have the max permitted legal limit shall surpass 100 km/h for not around 3% of the span in the third phase of driving cycle for which max speed is up to 120 km/h. The monitoring window intended for BS-VI Stage-2 with higher operating temperatures and higher space velocity plays a major role and adds a challenge to tackling the emission on the road. In this article, Mahindra and JM/Johnson Matthey will share the strategy of EATS hardware configuration to add the underfloor (uf) Selective Catalyst Reduction Filter (SCR) in addition to SCRF^® to ensure the Conformity Factor (CF) in OBD2 in RDE cycle architecture would be DOC+SCRF^®+SCR and the results of work which developed RDE-compliant diesel engines and after-treatment robust solutions to meet the emissions requirement of BS VI Stage-2.