Journal of Earth Sciences and Geotechnical Engineering

In Service CO2 and NOX Emissions of Euro 6/VI Cars, Light- and Heavy- dutygoods Vehicles in Real London driving: Taking the Road into the Laboratory

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  • Abstract

    Driving on-the-road has more frequent and prompt acceleration/decelerations than in the type-approval light-duty test conditions (NEDC), with Real Driving Emissions (RDE) of CO2 and NOX known to be considerably higher. Despite permissible limits of NOX emissions at type approval reducing significantly, in-service emissions from diesel vehicles have, in reality, not reduced at all through the Euro 15 / IV emission standards. TfL commissioned a programme of laboratory testing to better understand the in- service emission performance of Euro 6/VI vehicles over the TfL London Drive Cycle (LDC). This cycle was constructed from instrumented car data making repeated circuits of a set route at different times of day. Twelve Euro 6 passenger cars were tested over the entire 140 kms of the LDC from a warm-start. Three HGVs were tested over the suburban sub-cycle (40kms) in laden and un-laden condition. NOX emissions from the petrol cars were at a low level and below, or at, their type approval limit of 0.06 Only one SCR equipped diesel car achieved NOX emissions close to their 0.08 type approval limit. NOX emissions from diesel cars with only LNT NOX controls were between 3 and 13 times higher than their type approval limit (conformity factors). A diesel supermini was emitting NOX at the same level as the fully laden 40T artic HGV tested.

    Keywords: real driving emissions(RDE), CO2, NOX, Euro 6/VI, laboratory testing.