| The global objective of this study was to develop an exhaust aftertreatment system to reduce gaseous and particulate matter emissions from natural gas fueled vehicles. Specific objectives of this study were to evaluate and characterize emissions from a natural gas fueled vehicle powered by a Cummins C8.3G+ engine with and without the particulate matter (PM) filter and oxidation catalyst (OC) combination, which was designed and developed by West Virginia University in collaboration with Lubrizol-ECS. Central Business District (CBD) Cycle tests were performed on West Virginia University's Transportable Emissions Testing Laboratory. A heavy-duty transportable chassis dynamometer and a dedicated "clean" dilution tunnel were used to sample emissions from the vehicle. Past studies indicate that the use of a clean dilution tunnel omits the possibility of background emission concentrations being higher than actual vehicle-out emissions. Therefore, a clean primary dilution tunnel was designed, fabricated, and implemented for use during this study to avoid contamination from tunnel history. (Abstract shortened by UMI.)... |
