Laboratory test results

By | January 01, 2006
Bus emissions were measured on a chassis dynamometer over the City Suburban Heavy Vehicle Cycle (CSHVC) because the CSHVC is similar to the tested route duty cycle. In these laboratory tests, buses fueled with B20 demonstrated lower fuel economy and emissions, results that are significant at the 99 percent confidence level:

-Nitrogen oxides (NOx)-4 percent
-Total hydrocarbons (THC)-29 percent
-Carbon monoxide (CO)-24 percent
-Particulate matter (PM)-18 percent
-Fuel economy-3 percent

Based on the positive results and high-quality data obtained thus far, the buses will be evaluated for a second year of operation to provide additional B20 fuel and maintenance history and longer-term engine durability information. NREL will continue to provide data analysis and reporting of project results.
 
 
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