Mississippi State University
George, E. Clifford
Molen, Marshall G.
Toghiani, K. Rebecca
Date of Degree
Graduate Thesis - Open Access
James Worth Bagley College of Engineering
Dave C. Swalm School of Chemical Engineering
The addition of Tier 2 standards by United States Environmental Protection Agency (EPA) has increased focus on light-duty vehicle emissions. In this study, a diesel-electric hybrid vehicle was used for testing under the Challenge X program. The diesel engine was powered by a 20% soy-based biodiesel - 80% diesel blend, and the electric motor received its energy from a 330 volt Nickle Metal Hydride battery pack. The diesel engine, notorious for high emissions of nitrogen oxides (NOx) and particulate matter (PM), requires aftertreatment of these emissions to achieve Tier 2 EPA compliance. The primary focus of this thesis is use of a urea injection selective catalytic reduction (SCR) system to reduce NOx emissions. Also, a diesel particulate filter (DPF) was employed for PM reduction purposes. Significant decreases in both NOx and PM emissions were achieved.
Crawford, Kyle Elliott, "Impact of urea injection on NOx emissions for MSU Challenge X hybrid electric vehicle using a green fuel" (2007). Theses and Dissertations. 2610.