United States Department of Transportation
i
Comparisons between vehicular emissions from real-world in-use testing and EPA moves estimation.
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2012-07-01
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[PDF-2.01 MB]
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Abstract:"This research study developed a methodology to perform mandatory dynamometer vehicular emissions tests
on real roads, performed on-road emissions tests, and compared the test results to the estimates using the
current EPA emissions estimation model.
Currently, mandatory vehicular exhaust emission tests are performed on chassis or engine dynamometers
using the Federal Test Procedure (FTP)/Supplemental Federal Test Procedure (SFTP) drive schedules. Based
on the developed real-world in-use emissions testing methodology with using a modified test vehicle, authors
could follow the FTP/SFTP drive schedules while the vehicle was driven on real roads, and measure
emissions during the in-use on-road FTP/SFTP emissions testing. Emissions from the vehicle during the
testing were measured, analyzed, and compared to estimated emissions using the current EPA emissions
estimation model, MOtor Vehicle Emission Simulator (MOVES). The authors observed discrepancies
between the measured data and the MOVES estimates, especially when associated with cold-start emissions.
More detailed analysis results, along with the detailed test methodologies, are provided in this report."
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