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Real-Time Measurement of NOx Emissions from Modern Diesel Vehicles Using On-Board Sensors

Author

Listed:
  • Tommaso Selleri

    (European Commission, Joint Research Centre (JRC), 21027 Ispra, Italy
    European Environmental Agency (EEA), 1050 Copenhagen, Denmark)

  • Christian Ferrarese

    (European Commission, Joint Research Centre (JRC), 21027 Ispra, Italy)

  • Jacopo Franzetti

    (European Commission, Joint Research Centre (JRC), 21027 Ispra, Italy)

  • Ricardo Suarez-Bertoa

    (European Commission, Joint Research Centre (JRC), 21027 Ispra, Italy)

  • Dario Manara

    (European Commission, Joint Research Centre (JRC), 21027 Ispra, Italy)

Abstract

In this work, the performance of on-board vehicle exhaust emission sensors is investigated and compared to reference laboratory and on-road instrumentation for two modern diesel light-duty commercial vehicles, type-approved as Euro 6d-TEMP-EVAP-ISC and Euro 6d-ISC-FCM. The first step of the analysis was to perform emissions tests in the laboratory and compare the NOx concentrations registered by the vehicle sensors available at the engine-out and tailpipe positions with those recorded by reference laboratory instrumentation. In a second step, tests were also conducted on road, comparing the performance of on-board sensors with those of Portable Emission Measurement System (PEMS) analysers, which were taken as references. The uncertainty related to exhaust flow measurements was also addressed. In particular, emissions factors calculated using the flow rates measured either in the laboratory or on-road were compared to those obtained by computing exhaust flows with on-board recorded data available from the vehicle electronic control unit. Results showed maximum deviations on the order of 34% in laboratory tests and of 21% during on-road measurements. Finally, measurements were also carried out during a diesel particulate filter regeneration event, showing the good performance of the on-board sensors even when high NOx concentrations were present. These conditions can be similar to those experienced in the case of an after-treatment system malfunction or of a high-emitting event, and can thus be of interest for real-time malfunction identification and monitoring.

Suggested Citation

  • Tommaso Selleri & Christian Ferrarese & Jacopo Franzetti & Ricardo Suarez-Bertoa & Dario Manara, 2022. "Real-Time Measurement of NOx Emissions from Modern Diesel Vehicles Using On-Board Sensors," Energies, MDPI, vol. 15(22), pages 1-12, November.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:22:p:8766-:d:979732
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    References listed on IDEAS

    as
    1. Ricardo Suarez-Bertoa & Tommaso Selleri & Roberto Gioria & Anastasios D. Melas & Christian Ferrarese & Jacopo Franzetti & Bertold Arlitt & Naoki Nagura & Takaaki Hanada & Barouch Giechaskiel, 2022. "Real-Time Measurements of Formaldehyde Emissions from Modern Vehicles," Energies, MDPI, vol. 15(20), pages 1-12, October.
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    Cited by:

    1. Jacopo Franzetti & Tommaso Selleri & Christian Ferrarese & Anastasios Melas & Dario Manara & Barouch Giechaskiel & Ricardo Suarez-Bertoa, 2023. "Assessment of a NOx Measurement Procedure for Periodic Technical Inspection (PTI) of Light-Duty Diesel Vehicles," Energies, MDPI, vol. 16(14), pages 1-11, July.

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