Title: Framework for the assessment of PEMS (Portable Emissions Measurement Systems) uncertainty
Authors: GIECHASKIEL BAROUCHCLAIROTTE MICHAELVALVERDE MORALES VICTORBONNEL PIERREKREGAR ZLATKOFRANCO VICENTEDILARA PANAGIOTA
Citation: ENVIRONMENTAL RESEARCH vol. 166 p. 251-260
Publisher: ACADEMIC PRESS INC ELSEVIER SCIENCE
Publication Year: 2018
JRC N°: JRC112196
ISSN: 0013-9351
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC112196
DOI: 10.1016/j.envres.2018.06.012
Type: Articles in periodicals and books
Abstract: European regulation 2016/427 (the first package of the so-called Real-Driving Emissions (RDE) regulation) introduced on-road testing with Portable Emissions Measurement Systems (PEMS) to complement the chassis dynamometer laboratory (Type I) test for the type approval of light-duty vehicles in the European Union since September 2017. The Not-To-Exceed (NTE) limit for a pollutant is the Type I test limit multiplied by a conformity factor that includes a margins for the additional measurement uncertainty of PEMS relative to standard laboratory equipment. The variability of measured results related to RDE trip design, vehicle operating conditions, and data evaluation remain outside of the uncertainty margin. The margins have to be reviewed annually (recital 10 of regulation 2016/646). This paper lays out the framework used for the first review of the NOx margin, which is also applicable to future margin reviews. Based on experimental data received from the stakeholders of the RDE technical working group in 2017, a NOx margin of 0.24 to 0.43 was calculated, accounting for different assumptions of possible zero drift behaviour of the PEMS during the tests. The reduced uncertainty margin compared to the one foreseen for 2020 (0.5) reflects the technical improvement of PEMS over the past few years.
JRC Directorate:Energy, Transport and Climate

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