car manufacturers advertise in the prospectus, with low fuel consumption figures for new cars. In everyday life we are then, but often up to 30 per cent. That was at least until last autumn, so Since 1. September 2018, the new test cycle WLTP (World Harmonized Light Vehicle Test Procedure) applies and releases after 26 years in the NEDC (New European driving cycle). Objective: The consumption data of the manufacturer should finally be realistic.
What many people don’t know The first introduced in 1992, the NEDC served not never, everyday consumption map. Instead, we went about making cars globally comparable. Therefore, the standard consumption was also determined under identical laboratory conditions. To compare consumption in the world, remained, of course, an impossibility, because the test conditions in Asia, the USA and Europe were different.
WLTP procedure does not apply in the world
around a decade Ago, a first harmonisation attempt failed. Also for the now widely WLTP countless special rules and exceptions apply, so that a global comparison still can be no question. The WLTP in the EU (plus the UK, Iceland, Israel, Liechtenstein, Switzerland and Turkey) and in a modified Form in Japan and South Korea. But Australia, Russia, some countries in the Middle East and South America remain at the NEDC. The USA and Brazil to use again in other cycles. And China as Autonation, point 1, the WLTP uses only as a test procedure, the fuel Consumption is calculated on the NEDC and plans in the future, a private method of measurement.
After all, The first WLTP measurements reality show values in comparison to the NEDC significantly more consumption, especially as the gap between the laboratory and everyday life in the NEDC had in the last few years, for example, because of the many of the new turbo petrol engine significantly. With the WLTP, the test scenario was adjusted accordingly. The test cycle lasts for 30 minutes, twice as long, the time is reduced from almost 24 percent to 13 percent. In contrast, the distance traveled from 11 to 23 kilometres will be extended, and the average speed is increased from 34 to 46 km/h.
air conditioner is not
Also take into account the Specifications were strict: the base variant is not being tested only, but also derivatives, as special features have an influence on the measured values. For WLTP, the will continue to be driven primarily on a roller test bench, is one of the real test RDE (Real Driving Emissions) on the road. This ensures that the limit values for nitrogen oxides and particulate matter are complied with. What seems like a bad joke, is that the WLTP could not some of those responsible, what is the influence of a switched-on air conditioner. And therefore, one of the largest consumers of energy is not taken into account until Further notice in the car!
After all: The Plug-in Hybrid, the consumption values must previously, according to the NEDC cycle, all utopian layers deep, now the test procedure to two Time to complete – once started with a full battery, the second Time with a dead battery. From both Tests, the expense to be recognized is calculated at the end of consumption and CO2 mean.
The WLTP cycle has brought the manufacturers and importers a lot of homologation effort. Therefore, it came during and shortly after the changeover, in part, to adjustments in the supply and delivery bottlenecks. In the meantime, the industry has done its homework, and we as consumers – at least in Europe – benefit from finally more realistic fuel consumption and CO2 information.