Investigating the Incorporation of Idle, High Idle, and Driving Acceleration NOx Emissions Tests into the Periodic Technical Inspection Procedures

NOx pollution is one of the greatest air quality issues that urban areas face today, particularly within European Union (EU), yet currently this pollutant only controlled through homologation process. There no periodic technical inspection (PTI) process for emissions EU, leaving a weakness in legislation allowing high polluters to negatively impact quality. Work needs be performed incorporate simple, quick, inexpensive, and representative test accurately identify these emitters on-road vehicle fleet. This paper investigates options incorporation into EU PTI procedures. In trial constituting over 600 vehicles, 3DATX parSYNC was used measure series short types. These are an idle test, two types (a constant rapid idle), driving dynamic acceleration test. The repeatability all three good. concentrations have strong correlations mass each type, with use mean being deemed more than maximum concentrations. results across tested fleet calculated define pass/fail thresholds different findings work show multiple methods potential characterize from vehicle, but order catch on unloaded not suitable substitutes petrol vehicles.