SFTP Cycle Contributions to Light-Duty Diesel Exhaust Emissions
Interim rept. Sep-Dec 2001
SOUTHWEST RESEARCH INST SAN ANTONIO TXTARDEC FUELS AND LUBRICANTS RESEARCH FACILITY
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U.S. light-duty diesel exhaust emissions are determined for a given vehicle following the Supplemental Federal Test Procedure SFTP. The SFTP consists of three test cycles the chassis dynamometer portion of the FTP-75, US06 aggressive driving cycle, and SC03 air conditioning cycle. The objective of this investigation was to determine the relative contribution of each individual test cycle to each measured exhaust emission. Based on the exhaust emissions data from the light-duty diesel powered vehicle used in this project, the following conclusions are made While the SC03 air conditioning cycle is weighted at 37, only 21 of the total PM emissions come from the SC03 cycle 36 of the total NOx emissions are derived from this cycle. The relative importance of the SC03 contribution to total exhaust emissions can be illustrated by calculating the weighted emissions with and without the SC03 cycle. If only the FTP and US06 are considered non air-conditioned vehicle the total weighted NOx is 17 less than when the SC03 is included.
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