Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Characteristics of NOx and PN According to After-treatment for Light-duty Diesel Vehicles in WLTC Test Mode

WLTC 시험 모드에서 소형 경유자동차의 후처리 시스템에 따른 질소산화물 및 입자개수 배출 특성

  • 이동인 (한국교통대학교 자동차공학과) ;
  • 고상철 (국립환경과학원 교통환경연구소) ;
  • 유영수 (한국교통대학교 자동차공학과) ;
  • 박준홍 (국립환경과학원 교통환경연구소) ;
  • 차준표 (한국교통대학교 자동차공학과) ;
  • 전문수 (한국교통대학교 자동차공학과)
  • Received : 2018.11.22
  • Accepted : 2018.12.21
  • Published : 2018.12.30
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Abstract

Since September 2017, a small diesel vehicle certification test mode has been enhanced from NEDC to WLTC. The main reason for the change of the certification test mode is that the certification test mode of the emission control standard of the diesel vehicle does not sufficiently reflect various driving patterns of the actual roads. Several automakers have developed after-treatment systems such as LNT, SCR, and DPF to meet enhanced emissions regulations. In this study, four small diesel cars were selected for sale in Korea, and the exhaust gas measurement test was performed in the WLTC mode, which reflects the driving characteristics of the actual roads. As a result of test, LNT vehicle exceeded Euro 6 NOx regulation and SCR vehicle satisfied Euro 6 NOx regulation. In addition, both LNT and SCR systems showed high NOX emission characteristics due to speed, RPA and Vxa. For the PN, all test vehicles were fitted with a DPF and met the Euro 6 PN regulations, with similar PN emissions results in LNT and SCR system.

Keywords

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Fig. 1 WLTC Class 3b test mode

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Fig. 2 NOx emissions in WLTC mode of test vehicles

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Fig. 3 NOx and PN emissions according to acceleration

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Fig. 4 Cumulative NOx and PN emissions in WLTC mode

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Fig. 5 NOx and PN emission characteristics according to average 10 km/h speed

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Fig. 6 NOx and PN emission characteristics with deceleration and acceleration at an average speed of 10 km/h

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Fig. 7 NOx and PN emission characteristics of Diesel vehicles according to v×a in the WLTC of Extra high speed section

Table 1 Specification of test vehicles

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Table 2 Specification of chassis dynamometer

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Table 3 Specification of emission analyzer and particle counter

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Table 4 WLTC test cycles classification

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Table 5 WLTC driving characteristics

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