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The World-Harmonized Light-Duty Vehicles Test Procedure (WLTP) will replace the NEDC from September 2017 and will be used for more realistic mapping of a vehicle’s exhaust emissions and fuel consumption. The procedure uses a modified driving cycle and more stringent test specifications, and is aimed at making it possible to compare results worldwide. In future, the WLTP will form the legal basis of the Euro emissions legislation.

From 1 September 2017, the emissions and consumption figures must be specified for all new engines and models. From 1 September 2018, the emissions and consumption figures must be specified for all (new) vehicles in accordance with the WLTP.

WLTP driving cycle

The WLTP driving cycle is measured at a speed that is 10 km/h higher speed than in the NEDC. The measurement consists of four phases: to 60, 80, 100 and 130 km/h. In addition, the average speed of approximately 47 km/h is significantly higher than in the NEDC (approximately 33 km/h). The WLTP driving cycle takes around 30 minutes, whereas the NEDC takes only 20 minutes. The route length is 23 km instead of 11 km. The test chamber must be at a temperature of 23°C for the test procedure, compared to 20-30°C for the NEDC. The gear shifting points are no longer predetermined, but can be selected at random on a vehicle-by-vehicle basis. Unlike the NEDC, the WLTP takes account of individual items of optional equipment in terms of weight, aerodynamics, and electrical system requirements (no-load current). Optional equipment that consumes power, such as the air conditioning system or seat heating, remains switched off for the duration of the test procedure.

The WLTP has three power-to-weight ratio classes:

Class 1: up to and including 22 kilowatts per 1000 kg of vehicle weight
Class 2: up to and including 34 kilowatts per 1000 kg of vehicle weight
Class 3: from 35 kilowatts per 1000 kg of vehicle weight

Vehicles typically found in the EU often have a power-to-weight ratio above 34 kW/t and thus fall under class three, almost without exception. Vans and buses may also belong to class two.

See also