The new measuring technique contained in WLTP is based on an approximation of the test conditions to real-world circumstances, which means that the values determined will also have a greater relevance to reality. Among the changes this involves are redefined, significantly higher test conditions and speeds together with a substantially longer test duration (30 instead of 20 minutes).
To obtain a more precise determination of CO2 emissions, the new test procedure will include not only standard equipment options – as was previously the case – but also all special equipment options of a vehicle. This will produce two values for each type of vehicle: the lowest and highest possible standard consumption value according to aerodynamics, weight and rolling resistance. the equipment options. Thanks to WLTP, you will be able to better assess a vehicle’s consumption and CO2 emissions in future. In the case of a specific vehicle configuration, however, the individual standard value will be indicated directly.
In spite of the great accuracy, deviations are of course also possible with this test procedure. Regardless of this, everyday consumption and CO2 emissions continue to be subject to the different conditions of topography, climate and personal driving technique. Also exerting an influence are the traffic situation, the current load carried and the use of devices such as the air conditioning system. One thing is clear: the test conditions are more than realistic than before, which means that higher fuel consumption and CO2 values as well as lower ranges for electric vehicles can be expected on paper. However, this will not have any adverse effect on the real fuel consumption or range. In addition, the BMW Group is always working on new technologies in order to improve consumption and range.
The BMW Group is already working on the transition to the new test procedure and is preparing its product portfolio step-by-step with new vehicles, new engine versions or technical revisions. This will ensure that all vehicles within the entire fleet of the BMW Group comply with the applicable legislative framework at all times.
From September 2017, the WLTP will be compulsory for new type approvals. However, the legislator specifies that the values measured with WLTP will initially be communicated with a calculation referring it back to NEDC values. The EU Commission has developed a correlation technique for this purpose, which will be binding to an equal extent on all vehicle manufacturers. This phase is intended to simplify the changeover. Its duration will depend on the respective national legislation and will thus vary from market to market.
From September 2018, all manufacturers of vehicles sold in the EU as well as in Switzerland, Turkey, Norway, Liechtenstein, Israel and Ireland will be legally obliged to test in accordance with WLTP. Finally, by December 2020, all countries that adopt the EU legislation for vehicle registration will have to indicate and communicate WLTP values for all vehicles.