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Evaluation of On-Road NOx Emission from a Light Duty Diesel Vehicle using a Portable Emissions Measurement System

이동식 배출가스 측정장비를 이용한 소형 경유 자동차의 실도로 질소산화물 배출특성 분석

  • Lee, Tae-Woo (Transportation Pollution Research Center, National Institute of Environmental Research) ;
  • Lee, Jong-Tae (Transportation Pollution Research Center, National Institute of Environmental Research) ;
  • Kim, Jeong-Soo (Transportation Pollution Research Center, National Institute of Environmental Research)
  • 이태우 (국립환경과학원 교통환경연구소) ;
  • 이종태 (국립환경과학원 교통환경연구소) ;
  • 김정수 (국립환경과학원 교통환경연구소)
  • Received : 2011.11.24
  • Accepted : 2012.01.25
  • Published : 2012.02.29

Abstract

The purpose of this research is to quantify the compliance of on-road emission from a light duty diesel vehicle, based on a comparison to emission regulation standard. $NO_x$, CO and THC emissions were measured using a portable device on a selected real-world driving route with a length of approximately 22 km. On-road measurements were repeated by 10 times on a same route to reflect variability in traffic conditions. A test route was divided into 22 road links with length of 1 km to analyze emission results with higher spatial resolution. The average emissions of $NO_x$, CO and THC over total travel distance, which is approximately 220 km, were quantified to be in compliance with emission regulation standards. Under higher spatial resolution, $NO_x$ concentration exceeded a standard in 92 links out of 220 links. The extended time in stop period and the stop-and-go driving cycle were identified as two important reasons for increased $NO_x$ emissions in observed cases. Heavy traffics showed higher $NO_x$ emissions than free flow. These results indicate that the real-world vehicle emissions might exceed the compliance level associate with traffic conditions. Another interesting observation of this research is that the on-road emission characteristics can be independent to the average speed of road links with higher spatial resolution. Variability in on-road emission might not be fully described by solely relying on an average speed, because variability in traffic conditions and road conditions can influence on real-world vehicle emissions.

Keywords

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