DeNOx Strategy Adaptation and Optimization in Single Cylinder LCV Application for BS6 Phase-II Norms

Powertrain complexity rapidly increasing to meet fast moving regulation requirements. The BS6 Phase-1 regulation norms were implemented in India from April 1, 2020 and replaced the previous BS4 norms. Phase-2 of the BS6 regulation norms were came into effect on April 1, 2023. To meet this stringent regulation requirement, need effective performance of after treatment systems like DOC, DPF and SCR demands critical hardware selection and implementation. A robust DeNOx emissions strategy is developed in naturally aspirated single cylinder LCV application to meet cycle emissions, real drive emissions and OBD requirements. Naturally aspirated single cylinder engine has its own challenges to meet BS6 norms like higher engine out NOx, dynamic temperature profiles etc. It is always a challenge to adapt EATS in LCV application as these are low-cost vehicles. EATS components and sensors impacts the overall cost of the vehicle. This paper briefs about robust DeNOx emissions strategy in naturally aspirated single cylinder LCV application for BS6.2 norms which is first time in India. Feasibility study has done with two different architecture and finalized the better one by considering robustness of the hardware and overall system. The urea mixer design and development has done by considering EATS architecture and LCV application. SCR performance has optimized with higher engine out NOx and dynamic temperature profiles to meet cycle emissions, real drive emissions and OBD requirements. Vehicle with EATS system validated on road at sea level and various altitudes with different drive profiles like city, 2lane and highway. Validation results assure real drive emissions well within limit with optimized urea consumption.