The abbreviation WLTP stands for Worldwide Harmonized Light-Duty Vehicle Test Procedure and is a test procedure that measures a vehicle’s consumption and emission values on a chassis dynamometer. From 1 September 2017, the WLTP will be gradually introduced and replaces the previous NEDC test procedure. Thanks to its dynamic bias, the WLTP is significantly more realistic in terms of actual driving behaviour.
The WLTP is characterised by significantly higher acceleration events as well as by a considerably more dynamic driving profile. The top speed is increased to 131 km/h, with the average speed rising to 47 km/h. The driving time is 10 minutes longer, along with a higher proportion of motorway journeys simulated on the dynamometer; at the same time, the proportion of stopping times is reduced. The driven distance is doubled to 23 kilometres. The shift points are calculated in advance and are specific to the vehicle and its powertrain.
All optional extras with an influence on vehicle aerodynamics, rolling resistance and vehicle mass will in future be included in the measurement. The power consumption of comfort/convenience functions will likewise lead to a higher CO2 value. The only exception in the first stage of the WLTP is the air conditioner.
With the WLTP, the goal is to introduce a globally binding standard, with EU countries taking the lead. This will help to compare the fuel consumption and pollutant emissions of vehicles from different manufacturers. In addition, the standards will help to enable authorities to verify compliance with the statutory emissions limits, from hydrocarbons (HC) to carbon monoxide (CO) and nitrogen oxides (NOx) to particulates.