Authors
C. Scott Sluder and Brian H. West
Publication
SAE Paper# 2001-01-1933, Society of Automotive Engineers, 2001
Abstract
A prototype emissions control system consisting of a close-coupled
lightoff catalyst, catalyzed diesel particle filter (CDPF), and a NOx
adsorber was evaluated on a Mercedes A170 CDI. This laboratory experiment
aimed to determine whether the benefits of these technologies could be
utilized simultaneously to allow a light-duty diesel vehicle to achieve
levels called out by U.S. Tier 2 emissions legislation. This research was
carried out by driving the A170 through the U.S. Federal Test Procedure (FTP),
US06, and highway fuel economy test (HFET) dynamometer driving schedules.
The vehicle was fueled with a 3-ppm ultra-low sulfur fuel. Regeneration of the
NOx adsorber/CDPF system was accomplished by using a laboratory in-pipe synthesis
gas injection system to simulate the capabilities of advanced engine controls to
produce suitable exhaust conditions. The results show that these technologies
can be combined to provide high pollutant reduction efficiencies in excess of 90%
for NOx and PM.
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