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首页> 外文期刊>Transportation research, Part D. Transport and environment >Light duty gasoline vehicle emission factors at high transient and constant speeds for short road segments
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Light duty gasoline vehicle emission factors at high transient and constant speeds for short road segments

机译：Light duty gasoline vehicle emission factors at high transient and constant speeds for short road segments

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Vehicle emissions estimates are needed at high spatial and temporal resolution to estimate near-roadway air quality and human exposures. The M0BILE6 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 NO_X, HC, CO, and CO_2. The ratio of constant to average of transient speed emission rates range from 0.49 to 0.94 for NO, 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.

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