Mass emission tests were run on a number of gasoline powered trucks above 6,000-lb GVW during road driving and chassis dynamometer operation. A constant volume sampler was used to obtain samples during operation on a 7.24 mile course in San Antonio and during the entire 20 minute nine-mode FTP. The agreement between the road and dynamometer results, in terms of grams of emission per pound of fuel, was used to determine what road emissions would be from a larger, 145 vehicle, fleet that was subjected to similar CVS nine-mode FTP tests in the laboratory. Consideration of the end use of the data was made with preliminary expressions developed for possible use in determining the contribution of gasoline HDVs to air pollution. Data was provided to assist in better estimating national impact from this source. A group of 25 trucks representing a variety of makes, displacements and gross vehicle weights were studied and extensive road and dynamometer hydrocarbon, carbon monoxide and oxides of nitrogen emission data are included. Also included are percent of time at various increments of engine speed and manifold vacuum and vehicle speed that define how each truck operated in traffic over the road course. (Author)
In-Use Heavy Duty Gasoline Truck Emissions. Part I. Mass Emissions from Trucks Operated Over a Road Course
1973
233 pages
Report
No indication
English
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