期刊
TRANSPORTATION RESEARCH PART D-TRANSPORT AND ENVIRONMENT
卷 14, 期 8, 页码 610-614出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.trd.2009.09.001
关键词
Speed correction factor; Segment emissions; Near-roadway; Air quality study
资金
- National Science Foundation [CBET-0756263]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0756263] Funding Source: National Science Foundation
Vehicle emissions estimates are needed at high spatial and temporal resolution to estimate near-roadway air quality and human exposures. The MOBILE6 emission factor model is based on transient test cycles of less than 65 mph. Correction factors for high speed and constant speed are developed based on vehicle-specific power-based modal models for light duty gasoline vehicles, using data from portable emission measurement systems. At 80 mph versus 65 mph, the estimated average emission rates are greater by 30%, 20%, 80%, and 10% for NOx, HC, CO, and CO2. The ratio of constant to average of transient speed emission rates range from 0.49 to 0.94 for NOx at speeds of 20 mph and 80 mph. The high speed and constant speed correction factors are applied to estimate vehicle emissions for a freeway segment that includes vehicle cruising speeds between 65 and 80 mph. The potential error for not accounting for constant speed operation on a short segment of highway could be 49% at moderate speed and 24% at high speed. (C) 2009 Elsevier Ltd. All rights reserved.
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