a NOx Adsorber and Diesel Particle Filter Equipped Light-Duty Diesel Vehicle

Copyright © 2006 SAE International 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 United States 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; oxides of nitrogen (NOx) adsorber catalysts or NACs; 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) teamed with industry to engage in several testing projects under the Advanced Petroleum Based Fuels – Diesel Emission Controls (APBF-DEC) activity [1; 2; 5; 6; 7; 8]. Three of the APBF-DEC projects evaluated the sulfur tolerance and durability of NAC/DPF systems on various platforms, and one evaluated the performance and durability of a selective catalytic reduction (SCR) system in heavy-duty engines. A fifth project investigated the effects of oil properties on the performance and durability of a NAC. This project investigated the performance of the emission control system and system desulfurization effects on regulated and unregulated emissions in a light-duty diesel engine. Emissions measurements were conducted over the Federal Test Procedure (FTP), the US06 [an aggressive chassis dynamometer emission