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NEDC

NEFZ-Testzyklus

The abbreviation NEDC stands for “New European Driving Cycle” and refers to a test bench measurement used throughout Europe since 1992 to record the exhaust emissions and fuel consumption of vehicles. The NEDC applies to all passenger cars and light commercial vehicles.

The NEDC is due to be replaced by the WLTP test procedure from autumn 2017.

NEDC driving cycle

During a driving cycle, a vehicle is operated under specified conditions in order to calculate its fuel consumption and CO2 emissions. The measured emissions values form part of the manufacturer’s specifications required when registering and selling vehicles. Boundary conditions are specified for a given driving cycle. These include the starting temperature, speed, load, and the point at which exhaust gas measurement starts.

The standardised NEDC driving cycle is carried out on a single-axle roller dynamometer from a cold start and takes approximately 20 minutes. A single driving cycle consists of 13 minutes of simulated urban driving and 7 minutes of simulated extra-urban driving (max. speed 120 km/h). The temperature of the test chamber must be between 20 and 30°C when the test is started. The NEDC includes a driving resistance measurement, which provides information about the vehicle’s rolling resistance, air resistance, and friction losses. These values are included in the calculation of the final result.

The vehicle emissions are collected and analysed during the test. The fuel consumption can be calculated accurately from the measured carbon dioxide emissions. During the driving cycle, the vehicle has 26 seconds to accelerate from 0 to 50 km/h. The gear shifting points for each vehicle are specified in relation to this time.

See also