With Bharat Stage VI (BSVI) regulations on the horizon [3],[4]tighter particulate matter (PM) regulations will require the use of wall flow diesel particulate filters for on-road heavy duty (HD) diesel engines in India. The Indian HD vehicle market is very cost sensitive, especially with the majority of engine displacement being less than 7L [5] therefore, after treatment cost plays a significant role in design of the system. Robust wall flow diesel particulate filter solutions with the ability to deliver high filtration requirements required for particle number regulations can be designed in a cost-efficient manner. In this paper advanced design for diesel particulate filters with pressure drop, ash capacity, regeneration, and filtration performance are discussed. Corning’s asymmetric cell technology (ACT) was created to improve ash capacity and reduce pressure drop and has the potential to downsize up to 45%. This performance aspect can also be attributed to the monolithic design of the ultra-low expansion cordierite material. Other material concepts with high expansion (like SiC) require segmentation for thermo-mechanical robustness and these are not as good for space utilization, despite the thinner walls of the filter. From a regeneration perspective the cordierite diesel particulate filter (DPF) material enables regeneration at lower inlet temperatures (15-20°C) and can regenerate more efficiently at the same DPF inlet temperature compared to the SiC DPF. Finally, sufficient robustness is demonstrated at soot load levels to deliver extended regeneration intervals.
Overall the Corning® DuraTrap® AC 300/9ACT Cordierite DPF solution is a very compact and cost effective solution for the Indian market for the future BSVI regulations.
