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On-Board Sensor-Based NO_X Emissions from Heavy-Duty Diesel Vehicles

机译：车载柴油机基于传感器的NO_X排放

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摘要

Real-world nitrogen oxides (NO) emissions were estimated using on-board sensor readings from 72 heavy-duty diesel vehicles (HDDVs) equipped with a Selective Catalytic Reduction (SCR) system in California. The results showed that there were large differences between in-use and certification NOx emissions, with 12 HDDVs emitting more than three times the standard during hot-running and idling operations in the real world. The overall NOx conversion efficiencies of the SCR system on many vehicles were well below the 90% threshold that is expected for an efficient SCR system, even when the SCR system was above the optimum operating temperature threshold of 250 degrees C. This could potentially be associated with SCR catalyst deterioration on some engines. The Not-to-Exceed (NTE) requirements currently used by the heavy-duty in-use compliance program were evaluated using on-board NOx sensor data. Valid NTE events covered only 4.2-16.4% of the engine operation and 6.6-34.6% of the estimated NOx emissions. This work shows that low cost on-board NOx sensors are a convenient tool to monitor in-use NOx emissions in real-time, evaluate the SCR system performance, and identify vehicle operating modes with high NOx emissions. This information can inform certification and compliance programs to ensure low in-use NOx emissions.
机译：使用加利福尼亚州配备了选择性催化还原（SCR）系统的72辆重型柴油车辆（HDDV）的车载传感器读数估算了真实世界中的氮氧化物（NO）排放量。结果表明，在使用中和认证的NOx排放量之间存在很大差异，在现实世界中，在热运行和空转操作中，有12台HDDV排放的排放量是标准排放量的三倍以上。 SCR系统在许多车辆上的总NOx转化效率远低于有效SCR系统预期的90％阈值，即使SCR系统高于250摄氏度的最佳工作温度阈值也是如此。某些发动机的SCR催化器性能下降。使用车载NOx传感器数据评估了重型在用合规程序当前使用的不超过（NTE）要求。有效的NTE事件仅占发动机运行的4.2-16.4％，占估计的NOx排放的6.6-34.6％。这项工作表明，低成本的车载NOx传感器是实时监控使用中的NOx排放，评估SCR系统性能以及识别高NOx排放的车辆运行模式的便捷工具。该信息可为认证和合规性计划提供信息，以确保较低的使用中NOx排放量。

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  • 来源
    《Environmental Science & Technology》 |2019年第9期|5504-5511|共8页
  • 作者

    Tan Yi; Henderick Paul; Yoon Seungju; Herner Jorn; Montes Thomas; Boriboonsomsin Kanok; Johnson Kent; Scora George; Sandez Daniel; Durbin Thomas D.;

  • 作者单位

    Calif Air Resources Board, 1001 I St, Sacramento, CA 95814 USA;

    Calif Air Resources Board, 9500 Telstar Ave,Ste 2, El Monte, CA 91731 USA;

    Calif Air Resources Board, 1001 I St, Sacramento, CA 95814 USA;

    Calif Air Resources Board, 1001 I St, Sacramento, CA 95814 USA;

    Calif Air Resources Board, 9500 Telstar Ave,Ste 2, El Monte, CA 91731 USA;

    Univ Calif Riverside, Coll Engn, Ctr Environm Res & Technol, 1084 Columbia Ave, Riverside, CA 92507 USA;

    Univ Calif Riverside, Coll Engn, Ctr Environm Res & Technol, 1084 Columbia Ave, Riverside, CA 92507 USA;

    Univ Calif Riverside, Coll Engn, Ctr Environm Res & Technol, 1084 Columbia Ave, Riverside, CA 92507 USA;

    Univ Calif Riverside, Coll Engn, Ctr Environm Res & Technol, 1084 Columbia Ave, Riverside, CA 92507 USA;

    Univ Calif Riverside, Coll Engn, Ctr Environm Res & Technol, 1084 Columbia Ave, Riverside, CA 92507 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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