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Operational Evaluation of Emissions and Fuel Use of B20 Versus Diesel Fueled Dump Trucks. Final rept. (July 2003 - Dec. 2004).
| 题名： | Operational Evaluation of Emissions and Fuel Use of B20 Versus Diesel Fueled Dump Trucks. Final rept. (July 2003 - Dec. 2004). |
| 作者： | frey, h. c. kim, k. |
| 关键词： | *Trucks-; *Emissions-; *Diesel-fuels.;Biodiesel-; Heavy-duty-vehicles; Diesel-engines; Petroleum-; Fuel-use; Nitrogen-oxides; Carbon-monoxide; Hydrocarbons-; Particulate-matter; Carbon-dioxide; Evaluation-; North-Carolina. |
| 摘要： | Diesel vehicles contribute substantially to statewide emissions of NOx, an ozone precursor, and to particulate matter. NCDOT is conducting a pilot study to demonstrate the use of B20 biodiesel fuel on approximately 1,000 vehicles in selected areas of the state; there are plans to extend the use of B20 fuel to a much larger number of vehicles in all 100 counties in North Carolina. Real-world in-use on-road emissions of selected heavy duty diesel vehicles, including those fueled with B20 biodiesel and petroleum diesel, were measured during normal duty cycles using a portable emissions measurement system (PEMS). Four categories of dump trucks were selected for testing, including: (1) single rear axle with Tier 1 engines; (2) single rear axle with Tier 2 engines; (3) tandems with Tier 1 engines; and (4) tandems with Tier 2 engines. A total of 12 vehicles were tested. Each vehicle was tested for one day on B20 biodiesel and for one day on petroleum diesel, for a total of 24 days of field measurements. The vehicles were operated by drivers assigned by NCDOT. Each test was conducted over the course of an entire workshift, and on average there were 4.5 duty cycles per shift. Each duty cycle is comprised of a uniquely weighted combination of nine operating modes (idle, three levels of acceleration, three levels of cruise, deceleration, and dumping). Average emission rates on a mass per time basis varied substantially among the operating modes. |
| 报告类型： | 科技报告 |
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