Measurements of the Emissions of a “Golden” Vehicle at Seven Laboratories with Portable Emission Measurement Systems (PEMS)

Risultati dello studio

È stato pubblicato sulla rivista scientifica Sustainability l'articolo che riporta i risultati di uno studio realizzato da JRC, Innovhub SSI e CUNA nell’ambito dei circuiti di correlazione CUNA con l'obiettivo di mettere a confronto l'impiego di sistemi portatili di misurazione delle emissioni (PEMS) con le apparecchiature dei diversi laboratori italiani coinvolti.

Tra gli autori, Simone Casadei e Tommaso Rossi, Area Combustibili - Innovhub SSI.

Abstract

In the last years, the in-use emissions of vehicles are measured on the road with portable emissions measurement systems (PEMS). PEMS cannot measure as accurately as the laboratory grade equipment, and studies on their measurement uncertainty have continued since their appearance in the market. In this study we compared PEMS to laboratory grade equipment in Italian laboratories testing a diesel “Golden” (i.e., reference) vehicle for two consecutive years. The results showed equal means of PEMS and laboratory grade equipment for carbon dioxide (CO2), nitrogen oxides (NOx), and particle number (PN), with a variability of ±5 g/km for CO2, ±10 mg/km for NOx, and ±1 × 1011 p/km for PN, which further decreased in the second year. For carbon monoxide (CO), the PEMS were on average 5–20 mg/km higher than the bags (variability ±40 mg/km). The main conclusion of this study is that PEMS are accurate under controlled laboratory ambient conditions, without any indications of significant bias.

Authors:

  • Barouch Giechaskiel, European Commission - Joint Research Centre (JRC)
  • Simone Casadei, Responsabile Settore Fonti Mobili - Laboratorio Emissioni, Area Combustibili - Innovhub SSI
  • Tommaso Rossi, Laboratorio Emissioni, Area Combustibili - Innovhub SSI
  • Fabrizio Forloni, European Commission - Joint Research Centre (JRC)
  • Andrea di Domenico, CUNA