Advanced Aftertreatment System Meeting Future HD CNVII Legislation II

2025-01-8478

04/01/2025

Features
Event
WCX SAE World Congress Experience
Authors Abstract
Content
With the increasing clarity of the CNVII emission legislation, it is foreseeable that CNVII will further tighten the emission limits of major pollutants such as Nitrogen Oxide (NOx), Nitrous Oxide (N2O) and Particulate Number (PN). Together with the implementation of stage IV fuel consumption legislation in July 2025, which requires engine fuel consumption reduction or thermal efficiency improvement, it will lead to further deterioration of its pollutant emissions and reduction of exhaust temperature, posing greater challenges to the After-Treatment System (ATS) in terms of NOx removal, particularly during engine cold start and N2O formation suppression.
This study is an extension of our earlier investigation [1], and a novel copper-based corrugated SCR (Full Body-CuSCR, FB-CuSCR) technology was successfully applied. The results based on a modified CNVI medium duty engine indicated excellent dynamic response of the FB-CuSCR technology over cordierite which helped to improve the performance of the ATS in various test conditions, particularly during engine cold start. A single dosing system based on the same engine and catalyst technology was also studied. It required more measures such as higher urea consumption to have similar NOx and other pollutant emissions but in the meantime provided a potential cost-effective solution for certain applications for CNVII legislation. Various factors affecting the performance of single dosing and twin dosing systems were also discussed in this study.
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DOI
https://doi.org/10.4271/2025-01-8478
Pages
9
Citation
Wang, Y., Fu, G., Chen, S., Aberg, A. et al., "Advanced Aftertreatment System Meeting Future HD CNVII Legislation II," SAE Technical Paper 2025-01-8478, 2025, https://doi.org/10.4271/2025-01-8478.
Additional Details
Publisher
Published
Apr 01
Product Code
2025-01-8478
Content Type
Technical Paper
Language
English