Browse Publications Technical Papers 2019-26-0142

Optimized In Cylinder NOx Reduction Strategy for Meeting BSVI Emission Limits 2019-26-0142

The tough emission limits of BSVI norms with very low levels of NOx and PM emissions presents major techno economic challenges for the automobile industry. Combined efforts of pollutants reduction by combustion modification as well as the exhaust after treatment devices could only facilitate to achieve the desired emission targets. selective catalytic reduction technology is a mandatory system which uses ammonia from the aqueous urea solution to react with NOx forming nontoxic by products. The cost spent on aqueous urea solution in addition to the cost of BSVI diesel encounters high operating cost for the vehicle. NOx reduction by SCR too requires adequate quantity of ammonia from the AdBlue. Hence sensible utilization of DEF is essential for reduced running cost of the SCR system. SCR efficiency is higher for higher exhaust temperature and it requires minimum exhaust temperature above which only it operates. For conditions like cold start and low temperature combustion, SCR may not be effective and combustion optimization is the only way to reduce NOx. This article focuses on the reduction of NOx emission of the 2.2 l engine on adjustment of EGR rate and Main injection timing on different operating points on various equivalence ratios. The operating points for optimization were determined by conducting various drive trials on different type of road conditions along with consideration of NEDC. NOx, BSFC, soot and CO were measured and studied thoroughly from richer to leaner fuel-air mixtures. Calibration strategy involved the safe limits of NOx, soot, CO emissions and fuel consumption. Combustion optimization for NOx reduction was done keeping the in mind the consumption of DEF as well as diesel and the cost factor of both. Finally the best fit of strategy for reduced NOx and fuel consumption was arrived ensuring lower operating fuel and DEF cost.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:

Advances in Catalyst Technology for Light Duty Diesels for South American and European Emission Levels


View Details


Mild Catalytic DPF Regeneration and Related CO Emissions in Commercial Vehicles


View Details


Removal of Hydrocarbons and Particulate Matter Using a Vanadia Selective Catalytic Reduction Catalyst: An Experimental and Modeling Study


View Details