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Study of On-Board Exhaust Emissions Measurement Device for Heavy-Duty Vehicles (First Report)~Study on Measurement Methodologies
Published September 29, 2010 by Society of Automotive Engineers of Japan in Japan
In recent years, measurement of exhaust emissions for in-use vehicles on road using on-board exhaust gases measurement device (PEMS: Portable Emission Measurement System) is studied in Europe and the U.S. for the purpose of confirming the correct operation of exhaust emission control systems under actual vehicle operations. The actual vehicle operations include a wide variety of driving patterns and atmospheric conditions, and both correct measurement of exhaust emissions concentrations and exhaust gas flow rate are necessary to confirm the accuracy of the PEMS under these patterns and conditions. In this report the accuracy of PEMS device under several driving patterns and atmospheric conditions are examined, using several heavy diesel trucks meeting Japanese recent emission regulations. The results showed that the PEMS device needs some improvements to confirm the accuracy.