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The on-board tailpipe emissions measurement system (TOTEMS) : proof\0x2010 of\0x2010concept.
  • Published Date:
    2009-06-03
  • Language:
    English
Filetype[PDF-8.68 MB]


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The on-board tailpipe emissions measurement system (TOTEMS) : proof\0x2010 of\0x2010concept.
Details:
  • Publication/ Report Number:
    TRC Report # 10-015
  • Resource Type:
  • Geographical Coverage:
  • Format:
  • Abstract:
    An on-board tailpipe emissions instrumentation system was designed, assembled and tested as proof-of-concept

    for the University of Vermont’s Transportation Research Center (TRC) Signature Project #2 “real-world” vehicle

    emissions data collection effort. This report summarizes the measurement system’s status as of June 2009 and

    demonstrates that the study team can reliably collect on-board emissions/vehicle performance data. The purpose

    of the new instrumentation package is to collect real-world exhaust emissions for regulated (CO, HC, NOx) and

    unregulated (CO2, air toxics, particle number) pollutant species as well as vehicle operating parameters, all at 1Hz

    temporal resolution, while a test vehicle is driven on the road network in Chittenden County, Vermont. Future

    data collected using the on-board system will be used to model the modal emissions of alternative vehicles. This

    report documents (i) the instrumentation system’s components and the research team’s proposed data collection

    methodology; and (ii) presents initial data sets collected by quantifying real-world emissions from a 1999 Toyota

    Sienna minivan that was used in previous studies conducted by the PI. Unlike previous studies conducted by the

    PI (see Section 8 references for more detail), however, the new instrumentation package collects: (i) the full

    number distributions of particle emissions using a particle spectrometer instrument that was not available

    previously; and (ii) quantifies mobile source air toxic (MSAT) gaseous emissions in addition to criteria pollutant

    (CO, NOx, HC) and greenhouse gas (CO2, N2O, CH4) using a high-speed FTIR instrument specifically designed

    for on-board vehicle exhaust testing.

    This report summarizes initial measurements made by the Signature Project #2 study team using The On-board

    Tailpipe Emissions Measurement System (hereafter, “TOTEMS”) on-board the Toyota Sienna minivan as the

    “proof-of-concept” vehicle prior to initiating testing of two Toyota Camry study vehicles: one hybrid and one

    conventional. The Camry data will be used to build the first second-by-second, real-world emissions database for

    hybrid and conventional light-duty vehicles under cold climate and hilly terrain conditions experienced in

    Vermont.

    As the data in this report document, TOTEMS is a fully functional set of instrumentation developed for

    quantifying tailpipe gas and particle pollutant concentrations, exhaust flow rates, exhaust temperatures, sampling

    temperatures, vehicle position, engine operating behavior, ambient conditions, and instrumentation condition. All

    instrumentation is powered by an on-board battery power supply system to prevent artificial loads on the vehicle

    engine.

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