DeNOx Strategy Adaptation and Optimization in Naturally Aspirated Engine LCV Application for BSVI OBD-II Norms

Abstract

<div class="section abstract"><div class="htmlview paragraph">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 <a href="https://www.spinny.com/blog/index.php/bs4-vs-bs6/" target="_blank">BS4</a> 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. In Indian market, LCV application is cost sensitive and highly competitive where operational cost is most critical factor.</div><div class="htmlview paragraph">Naturally aspirated engine has less operating cost, which is the best for LCV applications, but is has its own challenges to meet BS6 norms like higher engine out NOx, dynamic temperature profiles etc. A robust DeNOx emissions strategy is developed in naturally aspirated engine LCV application to meet cycle emissions, real drive emissions and OBD requirements. It is always a challenge to adapt EATS in LCV application as these are low-cost vehicles and EATS components impacts the overall cost of the vehicle.</div><div class="htmlview paragraph">This paper briefs about robust DeNOx emissions strategy in naturally aspirated engine LCV application for BSVI OBD-II norms to address high engine out NOx with dynamic temperature profiles which is first time in India. Feasibility study has done with two different architecture and finalized the better one by considering EATS performance robustness and overall system layout. SCR catalyst size and urea mixer design 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 fuel economy and urea consumption.</div></div>