The current state-of-practice emission modeling tools, namely: MOBILE, EMFAC, CMEM, and VT-Micro can only consider vehicle speeds up to 128 km/h (80 mi/h). Consequently, the research presented in this paper gathers field data and develops models for the estimation of fuel consumption, CO2, CO, NO, NO2, NOx, HC, and PM emissions at high speeds. A total of nine vehicles including three semi-trucks, three pick-up trucks, and three passenger cars are tested on a nine-mile test track in Pecos, Texas. The fuel consumption and emission rates are measured using two portable emission measurement systems. Models are developed using these data producing minimum errors for fuel consumption, CO2, NO2, HC, and PM emissions. Alternatively, the NO and NOx emission models produce the highest errors with a least degree of correlation. The study demonstrates that the newly constructed models overcome the shortcomings of the state-of-practice models and can be utilized to evaluate the environmental impacts of high speed vehicles.
Samenvatting