NCDOT is proceeding with the use of alternative fueled vehicles (AFVs), including biodiesel-fueled medium duty trucks. Diesel vehicles contribute substantially to statewide emissions of NOx, an ozone precursor, and to particulate matter. There is a need for empirical quantification and comparison of emissions, fuel economy, and vehicle operation on both conventional and biodiesel fuels.
This project addresses these critical needs based upon four tasks. Task 1 involves design of field data collection study to measure second-by-second emissions of NOx, particulate matter, CO, and CO2, fuel use engine data and vehicle activity (e.g., speed, location) data using an on-board portable instrument. Task 2 involves the field data collection itself, including the logistics of instrument calibration and deployment. Task 3 involves data reduction and analysis for the purpose of developing benchmark modal emission rates that enable comparison of B20 and conventional diesel fuel. Task 4 involves the development of strategic recommendations based upon empirical data collected in the study in order to address the key needs of NCDOT, including evaluation of the benefits of biodiesel fuel, air quality management, energy management, and improved operation.
The primary product of this work will be a database, analysis and recommendations pertaining to operational practices and their implications for fuel use and emissions. The data will be based upon real-world, on-road in-use measurements of fuel economy and emissions on a second-by second basis. A secondary product of this work will be information and data that can be used to assess compliance of North Carolina with respect to the National Ambient Air Quality Standards and conformity. Another secondary benefit of this work could be realized based upon transfer of the emissions data to other agencies to support more realistic and scientifically defensible estimates of emissions pertaining to North Carolina. This, in turn, would support more appropriate air quality and energy policy strategies."
