Date of Graduation


Document Type


Degree Type



Statler College of Engineering and Mineral Resources


Mechanical and Aerospace Engineering

Committee Chair

Gregory J Thompson


Exhaust emissions emitted from heavy-duty diesel engines (HHDE) have been one of the contributors towards air pollution which indirectly have adverse effects on human health. This concern has made regulatory agencies impose stringent emissions standards in the United States and in many other countries. These increasingly stringent exhaust emissions levels have forced the HDDE manufacturers to focus largely on engine technology to reduce emissions levels to meet the regulatory standards.;Diesel fuel properties influence diesel engine emissions but how sensitive the engines are to theses property changes is the objective of this study. To examine the influences, regulated emissions from two engines were measured which represented early and current electronically controlled HDDE production. Commercially available on-road diesel fuels were tested along with a biodiesel blended fuel. A 1992 Detroit Diesel Corporation (DDC) Series 60 and a 2004 Cummins ISM370 engines were used to evaluate the diesel fuel property effects using engine dynamometer cycles like the US Transient cycle also know as the Federal Transient Procedure (FTP) cycle, the European Stationary Cycle (ESC) which is a 13 mode steady state cycle and two on-road cycles. Only engine-out emissions were examined. To determine which fuel property influences emissions it was necessary to decouple the intercorrelation between fuel properties. This decoupling was achieved by using Pearson correlation coefficients. Additionally, statistical analysis software was used to create models that predicted engine specific emissions based on the fuel properties which were not correlated.;Results show that NOx variation was as high as 16%, HC of 40%, PM of 44% and CO of 34% between fuels. However the levels of these variations were different for two the engines as the engines sensitivity to fuel property changes differed.