On-road Heavy-duty Vehicle Emissions Monitoring System

详细信息    查看全文

• 作者：Gary A. Bishop ; Rachel Hottor-Raguindin ; Donald H. Stedman ; Peter McClintock ; Ed Theobald ; Jeremy D. Johnson ; Doh-Won Lee ; Josias Zietsman ; Chandan Misra
• 刊名：Environmental Science & Technology
• 出版年：2015
• 出版时间：February 3, 2015
• 年：2015
• 卷：49
• 期：3
• 页码：1639-1645
• 全文大小：346K
• ISSN：1520-5851

文摘

The introduction of particulate and oxides of nitrogen (NO_x) after-treatment controls on heavy-duty vehicles has spurred the need for fleet emissions data to monitor their reliability and effectiveness. The University of Denver has developed a new method for rapidly measuring heavy-duty vehicles for gaseous and particulate fuel specific emissions. The method was recently used to collect 3088 measurements at a Port of Los Angeles location and a weigh station on I-5 in northern California. The weigh station NO_x emissions for 2014 models are 73% lower than 2010 models (3.8 vs 13.9 gNO_x/kg of fuel) and look to continue to decrease with newer models. The Port site has a heavy-duty fleet that has been entirely equipped with diesel particulate filters since 2010. Total particulate mass and black carbon measurements showed that only 3% of the Port vehicles measured exceed expected emission limits with mean gPM/kg of fuel emissions of 0.031 卤 0.007 and mean gBC/kg of fuel emissions of 0.020 卤 0.003. Mean particulate emissions were higher for the older weigh station fleet but 2011 and newer trucks gPM/kg of fuel emissions were nevertheless more than a factor of 30 lower than the means for pre-DPF (2007 and older) model years.