Does the New European Driving Cycle (NEDC) really fail to capture the NO_X emissions of diesel cars in Europe?

ABSTRACT: Tests with Portable Emissions Measurement Systems (PEMS) have demonstrated that diesel cars emit several times more NO_X on the road than during certification on the New European Driving Cycle (NEDC). Policy makers and scientists have attributed the discrepancy to the unrealistically low dynamics and the narrow temperature range of NEDC testing. Although widely accepted, this assumption was never been put under scientific scrutiny. Here, we demonstrate that the narrow NEDC test conditions explain only a small part of the elevated on-road NO_X emissions of diesel cars. For seven Euro 4-6 diesel cars, we filter from on-road driving those events that match the NEDC conditions in instantaneous speed, acceleration, CO₂ emissions, and ambient temperature. The resul

SUBMITTER: Degraeuwe B 

PROVIDER: S-EPMC5304423 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature