The test procedure is defined in UNECE R101 Although originally designed for petrol-based road vehicles, the driving cycle is now also used for diesel vehicles and to estimate the electric power consumption and driving range of hybrid and battery electric vehicles.
The region implementing the test defines limits for each of the pollutants, for instance the Euro level within the EU.
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This arrangement enables the use of a single physical vehicle to test all vehicle body styles (Sedan, hatchback, MPV etc.) by simply changing the look-up table.
The New European Driving Cycle (NEDC) is a driving cycle, last updated in 1997, designed to assess the emission levels of car engines and fuel economy in passenger cars (which excludes light trucks and commercial vehicles).
It is also referred to as MVEG cycle (Motor Vehicle Emissions Group).
However, to improve repeatability, they are generally performed on a roller test bench.
This type of bench is equipped with an electrical machine to emulate resistance due to aerodynamic drag and vehicle mass (inertia).