A new approach for static NOx measurement in Periodic Technical Inspection [post]

Eugenio Fernández Cáceres, Alicia Valero Delgado, Juan José Alba López, Abel Ortego Bielsa
2021 unpublished
NOx emissions in vehicles are currently only controlled through the homologation process. There is a lack of knowledge to reliably assess and control real NOx emissions of vehicles, because although vehicles in EU-27 are subject to PTI (Periodic Technical Inspection), NOx are not among the pollutants currently being controlled. In this paper, a new approach for measuring NOx in PTI is proposed. At PTIs, a test needs to be simple, quick, inexpensive, representative, and accurate. To that end, it
more » ... needs to be carried out under static conditions, so no power bench or complex equipment is required. The method shown in this paper has been developed and validated at a PTI Spanish station, to ensure feasibility and repeatability. This method is based on the relationship between % engine load and exhaust NOx concentration at idle engine speed. The quality and representativity of this relationship have been checked with a p-value lower than 0.01. The method has been compared with a different NOx measurement technique based on the simulation on a test bench and the ASM 20–50 cycle. The achieved quality and repeatability of the new approach shows that it could be a useful tool to be applied in PTI for detecting high NOx emitting vehicles and get information from the diesel vehicles fleet.
doi:10.21203/rs.3.rs-181647/v1 fatcat:apupdgdqnrae3aytkxzh5rirqa