United States Department of Transportation
i
Perspectives on Fuel Consumption and Air Contaminant Emission Rates by Highway Vehicles
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2001-01-01
[PDF-103.50 KB]
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Abstract:This TechBrief summarizes the investigation, "Highway Effects on Vehicle Performance," undertaken at the Volpe National Transportation Systems Center. The main product of this study is a model, "Highway Effects on Vehicle Performance" (HPP), a computer program that calculates estimated fuel consumption and exhaust emission rates and the amounts of each for a given highway segment for one or more vehicles (traffic) as determined by the user for highway geometric factors and idling or speeds, and accelerations (external loads, also gears) and presents the results, including cumulative results, in both pictorial and numerical forms. Hence, one can implement the model to estimate the effects of highway geometry and pavement and/or traffic conditions. Essentially, the model combines external loads from all sources, namely rolling resistance, aerodynamic drag, accelerations (inertia), grades, curves, and vehicle idling with essentially engine/vehicle maps that provide the rates of fuel consumption and air contaminant emissions for the conditions of the external loads and engine speeds and gears or vehicle idling, as appropriate.
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