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Tier 2 Intermediate Useful Life (50,000 Miles) and 4000 Mile Supplemental Federal Test Procedure (SFTP) Exhaust Emission Results for a NOx Adsorber and Diesel Particle Filter Equipped Light-Duty Diesel Vehicle
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 11, 2005 by SAE International in United States
Annotation ability available
Due to its high efficiency and superior durability the diesel engine is again becoming a prime candidate for future light-duty vehicle applications within the United States. While in Europe the overall diesel share exceeds 40%, the current diesel share in the U.S. is 1%. Despite the current situation and the very stringent Tier 2 emission standards, efforts are being made to introduce the diesel engine back into the U.S. market. In order to succeed, these vehicles have to comply with emissions standards over a 120,000 miles distance while maintaining their excellent fuel economy. The availability of technologies such as high-pressure common-rail fuel systems, low sulfur diesel fuel, NOx adsorber catalysts (NAC), and diesel particle filters (DPFs) allow the development of powertrain systems that have the potential to comply with the light-duty Tier 2 emission requirements. In support of this, the U.S. Department of Energy (DOE) has engaged in several test projects under the Advanced Petroleum Based Fuels - Diesel Emission Controls (APBF-DEC) activity [1; 2; 5; 6]. The primary technology being addressed by these projects are the sulfur tolerance and durability of the NAC/DPF system.
The project investigated the performance of the emission control system and system desulfurization effects on regulated and unregulated emissions. Emissions measurements were conducted over the Federal Test Procedure (FTP), Supplemental Federal Test Procedure (SFTP), and the Highway Fuel Economy Test (HFET). Testing was conducted after the accumulation of 150 hours of engine operation calculated to be the equivalent of approximately 8,200 miles. For these evaluations three out of six of the FTP test cycles were within the 50,000-mile Tier 2 bin 5 emission standards (0.05 g/mi NOx and 0.01 g/mi PM). Emissions over the SC03 portion of the SFTP were within the 4,000-mile SFTP standards. The emission of NOx+NMHC exceeded the 4,000-mile standard over the US06 portion of the SFTP. Testing was also conducted after the accumulation of 1,000 hours of engine operation calculated to be the equivalent of approximately 50,000 miles. Recalibrated drivability maps resulted in more repeatable NOx emissions from cycle to cycle. The NOx level was below the Tier 2 emission limits for 50,000 and 120,000 miles. NMHC emissions were found at a level outside the limit for 120,000 miles.
CitationTatur, M., Tyrer, H., Tomazic, D., Thornton, M. et al., "Tier 2 Intermediate Useful Life (50,000 Miles) and 4000 Mile Supplemental Federal Test Procedure (SFTP) Exhaust Emission Results for a NOx Adsorber and Diesel Particle Filter Equipped Light-Duty Diesel Vehicle," SAE Technical Paper 2005-01-1755, 2005, https://doi.org/10.4271/2005-01-1755.
- Tomazic D., Tatur M., Thornton M., “Development of a Diesel Passenger Car Meeting Tier 2 Emissions Levels” SAE Paper 2004-01-0581, March 2004, Detroit, Michigan.
- Tomazic D., Tatur M., Thornton M., “APBF-DEC NOx Adsorber/DPF Project: Light-Duty Passenger Car Platform,” DEER Paper, August 2003, Newport, Rhode Island.
- Geckler S., Tomazic D., et al., “Development of a Desulfurization Strategy for a NOx Adsorber Catalyst System,” SAE Paper 2001-01-0510, March 2001, Detroit, Michigan.
- McDonald J. “Progress in the Development of Tier 2 Light-Duty Diesel Vehicles” SAE Paper 2004-01-1791, March 2004, Detroit, Michigan.
- Webb Cynthia C. et al. “Achieving Tier 2 Bin 5 Emission Levels With a Medium-Duty Diesel Pick-Up and a NoDx Adsorber, Diesel Particulate Filter Emissions System-Exhaust Gas Temperature Management” SAE Paper 2004-01-0584
- Whitacre Shawn et al., “Systems Approach to Meeting Epa 2010 Heavy-Duty Emission Standards Using a NoDx Adsorber Catalyst and Diesel Particle Filter on a 15l Engine” SAE Paper 2004-01-0587