AbstractVehicle 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 65mph. 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 80mph versus 65mph, 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 20mph and 80mph. 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 80mph. 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.
Light duty gasoline vehicle emission factors at high transient and constant speeds for short road segments
Transportation Research Part D: Transport and Environment ; 14 , 8 ; 610-614
2009-01-01
5 pages
Article (Journal)
Electronic Resource
English
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