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This is how consumption tests WLTP and RDE work for Euro 6c

Hans-Dieter Seufert
New consumption test WLTP and RDE for Euro 6c, 6d
Subscriptions & booklets
  • Emission tests now in real operation
  • This is how the WLTP works
  • Those were the problems of the NEDC
  • Conclusion

W o is everything better now? Can we finally rely on the consumption values ​​promised by the manufacturer again? In principle yes, but it still depends on your personal driving style. For years, the previous NEDC consumption cycle was criticized as being impractical, and in fact the gap between standard consumption and real consumption has widened more and more in recent years.

That will change noticeably. From September 1st, the next emission level Euro 6c applies to type testing of new models and engine variants, in which consumption is determined according to the new cycle WLTP (World Harmonized Light Vehicles Test Procedure). From September 2018, Euro 6c will then apply to all newly registered cars. Although the W in the abbreviation WLTP stands for “World” and thus suggests global validity, many countries have now withdrawn from the harmonization talks either completely (USA) or in part (India, Korea). China is still taking part in the meetings, but has not yet decided to convert the results into laws. WLTP is currently mainly being promoted by the EU.

Some manufacturers specified the WLTP values ​​early on. According to the old standard, the Opel Astra 1.0 Ecotec with 105 PS should be satisfied with 4.5 l /100 km, according to the WLTP the consumption increases to 4.8 to 7.3 liters, depending on the equipment of the car. For the 118i with a 1.5-liter three-cylinder engine, BMW specifies 7.0 instead of 5.4 liters as in the NEDC. On average, experts expect the values ​​to increase by a good 20 percent. Here there is a list with a number of models for which the ADAC recorded the increase in CO2 emissions and the corresponding increase in vehicle tax.

Consumption of large engines does not rise quite as much

The consumption figures for larger engines such as six and eight-cylinder engines will increase less sharply in percentage terms in the WLTP. This is due to the fact that the driving profile on the roller dynamometer only demands a fraction of their lavish performance, while smallMachines have to perform significantly more than in the lazy NEDC.

In future, manufacturers will not only have to specify the consumption value for the cheapest equipment variant, but also for each one that can be configured. This ensures large consumption margins, as can be seen in the example of the Opel Astra. Big wheels, wide tires and extensive equipment increase consumption. Nevertheless, the future information will be much more precise. When the customer puts together his dream car in the configurator, he also receives the specific WLTP consumption value.

The determination is very time-consuming for the manufacturer, BMW alone calculates 400,000 data records for its portfolio for the various configuration options.

1.) Start-stop systems are the easiest way to reduce NEDC consumption by around half a liter, because the stop phase is very is long. 2.) The overland mode delivers the lowest consumption thanks to a fairly constant drive and moderate speed. 3.) The old NEDC cycle only has a very small part over 100 km /h.

1. ) Start-stop system: The stop phases are shorter. 2.) Country road: The pace is higher and less constant. 3.) Motorway: WLTP comes much closer to reality with higher speeds that are driven longer and also demands moreAccelerate and accelerate more.

With the WLTP, there are three different driving cycles (WLTC) that depend on the power-to-weight ratio of the vehicle. Most cars, however, will be measured in the third cycle class. This starts at over 46 hp per ton. The WLTC starts with a cold start and covers a distance of 23.26 km that can be completed in 30 minutes. This data already results in the considerably higher average speed of 46.5 km /h.

Two reasons ensure this: On the one hand, the stance phases are significantly lower at 13.4 percent than in the NEDC and, on the other hand, the After the cycle, a longer extra high phase was driven that simulates a section of the motorway. The maximum speed here is 131.3 km /h. On average, the class 3 WLTC only requires a drive power of around 10 hp. At the top it can also be 64 hp. In contrast to the NEDC, special equipment such as weight, aerodynamics and quiescent current requirements are included. Unfortunately, the now extremely important air conditioning system does not play a role again.

Vehicle tax for newly registered cars is increasing because the CO2 emissions increase on paper. However, one can also regard the coming additional load as a lower load in the past - the real consumption was always considerably higher than the NEDC consumption. For many driving profiles it will also be higher than the WLTP information. Only those who curb their gas foot can save in the future.

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