Date of Graduation
Statler College of Engineering and Mineral Resources
Mechanical and Aerospace Engineering
The objective of study was to design, develop, and evaluate techniques to measure exhaust emissions from diesel-powered off road equipment. Emissions data was collected from a Komatsu hydraulic excavator and a Caterpillar track-type tractor.;For the excavator, data was logged during in-field operation, and test cycles were created on a dynamometer test bed using this data. For the tractor, on-board emissions measurement equipment collected mass emissions rate data in field.;Vast differences were found between transient and 8-mode brake-specific test results. Transient cycle HC, CO, CO2, NO, and PM emissions were 50%, 65%, 10%, 35%, and 50% lower than 8-Mode results, respectively. Data collected from the tractor during a 360 second test was 5062 g/cycle CO2, 67.7 g/cycle NOx, and 0.349 g/cycle DPM.;The study concluded that exhaust emissions are vehicle and task specific in nature, and that 8-Mode test results lack the ability to realistically estimate actual in-use engine emissions.
Rohrbaugh, Jeremiah Christopher, "Characterization of infield duty cycles and exhaust emissions from diesel powered off-road heavy-duty equipment" (2002). Graduate Theses, Dissertations, and Problem Reports. 1289.