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DEVELOPMENT OF ON-ROAD EMISSION FACTORS FOR HEAVY- DUTY VEHICLES
Citation:
Harris*, D B. AND F. G. King. DEVELOPMENT OF ON-ROAD EMISSION FACTORS FOR HEAVY- DUTY VEHICLES. In Proceedings, 1995 Diesel Engine Emissions Reduction Workshop, San Diego, CA, July 24 - 27, 1995. U.S. Department of Energy, Washington, DC, 6 p., (1995).
Impact/Purpose:
Proceedings Paper
Description:
The paper discusses an EPA project the objectives of which are to: (1) define on-road emissions from heavy-duty diesel vehicles (HDDVs); (2) assess agreement between engine and chassis dynamometers and on-road emission factors; (3) evaluate current conversion factors for dynamometer data and develop appropriate ones if needed; and (4) develop a modal emissions model. The on-road test component uses an instrumented 45-ft (15-m) cargo van trailer to test various tractors during on-road operation according to a modal matrix. These results are compared to those obtained during actual runs over-selected routes. The experimental approach involves on-road tests that develop the modal data necessary to model the emissions as a function of speed, load, grade, and acceleration. These data are fitted to routes representing trans-urban interstate travel, terminal entry/exit, and urban delivery. Final test sequence utilizes a certification cycle that has been adapted to suit actual truck operational capability to develop data for direct comparison with the dynamometer data.