Atmospheric Carbon Dioxide and Nitrogen Oxides Emissions Data for 2003-2005 Model Year Trucks

Madhava R. Madireddy^*, Nigel N. Clark

Center for Alternative Fuels, Engines and Emissions, Department of Mechanical and Aerospace Engineering, West Virginia University, Morgantown, West Virginia, USA.

DOI: 10.4236/ajcc.2015.44028                

Abstract

Heavy-duty trucks account for a substantial portion of the atmospheric carbon dioxide (CO₂) and nitrogen oxides (NO_x) inventory. The data presented in this paper will help the research community be interested in developing models that predict the NOx and CO₂ levels in real use. Continuous data of emissions were recorded from chassis dynamometer testing of five 2003-2005 model year (MY) heavy-duty trucks. The instantaneous emissions rate was plotted against axle power in all cases. The effect of vehicle test weight and the drive cycle employed on the relation between emissions rate (grams per sec) and axle power was studied. The NO_x/CO₂ ratio was found to be independent of the test cycle. The average NO_x/CO₂ ratio for the 2003-2005 MY trucks was found to be 0.0051, which agrees reasonably well with the estimated ratio of 0.0048, based on certification standards. The data were compared to those from 1994-2002 MY trucks; the average NO_x/CO₂ ratio for those trucks was 0.0141. For the 2003-2005 MY trucks, the distance specific NO_x (grams per mile) and the fuel economy (miles per gallon) were less than those of 1994-2002 MY trucks.

Keywords

Emissions Inventory, Chassis Dynamometer, Instantaneous Emissions, NO_x/CO₂ Ratio, Certification

Conflicts of Interest

The authors declare no conflicts of interest.

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