NEDC and WLTP
The new test provides for a modified driving cycle and more stringent test specifications, including a longer measurement period and a higher maximum speed. The changes at a glance:
From the cold start, four speed ranges are measured on the chassis dynamometer: up to 60, up to 80, up to 100 and over 130 km/h. During each of these ranges, the vehicle is always accelerated and slowed down. The top speed is thus 10 km/h higher than the NEDC. In addition, the average speed of about 47 km/h is also significantly higher than the previous 33 km/h. The test chamber has a temperature of 23°C, while NEDC allowed a range of 20-30°C. The entire WLTP drive cycle takes about 30 minutes, while the NEDC only took 20 minutes. The track length has more than doubled and is now 23 instead of 11 kilometres. Unlike the NEDC, individual optional extras for the WLTP for weight, aerodynamics, rolling resistance, and vehicle electrical system requirements (quiescent current) are also taken into account. Power-consuming optional extras, such as the air conditioning and seat heating, still remain switched off for the test procedure.