Role of Cerium-oxide Diesel Additive on Emissions and Fuel-efficiency of a Light-duty Truck
GUAN ZHAO, Philip K Hopke, Suresh Dhaniyala
Abstract Number: 633
Working Group: Combustion
Last modified: April 4, 2011
As newer regulations are introduced requiring lower emissions and higher fuel efficiency from diesel engines, the possible role of fuel additives such as cerium oxide nanoparticles is increasingly under focus. Cerium oxide nanoparticles have been previously shown to result in improved efficiency and reduced ultrafine particle and NOx emissions with diesel fuel, but there have been few parametric studies to understand the relationship between the additive concentrations and improvements in engine performance. Also, most tests with these additives have been conducted with stationary engines. We present results from our chassis dynameter-based testing of a cerium oxide nanoparticle additives using a GM Silverado diesel truck as our test vehicle. A fully automated chassis-dyno and emissions testing setup is used for this experiment, with the exhaust sample diluted at a ratio of 1:100 and the test vehicle run at a constant speed of 45 mph. The effectiveness of the nanoparticle fuel additive was determined from a combination of: real-time gas-phase measurements of CO, CO$_2, SOx and NOx; particle measurements of number concentrations and size distributions using a combination of a Wide-Range Particle Spectrometer (WPS; MSP Inc.) and a Fast Mobility Particle Sizer (FMPS; TSI Inc); fuel usage rate measurements; and elemental/organic carbon (EC/OC) measurements; for the test cases of the same fuel with and without the additive. The details of the experimental setup and results of the dynamometer tests will be presented.