WLTP (Worldwide Harmonised Light Vehicle Test Procedure)

 

1. What is WLTP?



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Under condition defined EU law, the Worldwide Harmonised Light Vehicle Test Procedure (WLTP) laboratory test measures fuel consumption, CO2 emissions and pollutant emissions from passenger cars.
Despite WLTP is a strictly controlled measurement, it is a laboratory test. RDE* The Real Driving arisonlements WLTP from realistic condition.
*RDE The Real Driving Emissions (RDE) test measures the pollutants, such as NOx, emitted by cars while driven on the road. RDE ensures that cars deliver low emissions over on-road conditions. Europe is the first region in the world to introduce such on-road testing, marking a major leap in the testing of car emissions.

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Although WLTP is to be used as a strict global standard test cycle method, it is a choice that each region uses WLTP test cycle in different ways depending on it’s regulation, requirement, etc.

 

2. The difference between NEDC and WLTP

WHAT IS WLTP AND HOW DOES IT WORK?
Since the 1980s, so called “New European Driving Cycle (NEDC)” have been used. However, now that NEDC has become outdated under the current technology in automobile industry and usage condition, the EU has developed the new test method of WLTP and is obliging manufactures to shift to WLTP.
A biggest difference between NEDC and WLPT is a theoretical driving profile or real-driving data gathered from around the world. i.e. WLTP results are closer to daily driving profiles.
They test a car at four different speeds at low, medium, high, and extra high under the WLTP cycle ; acceleration, braking, etc. using lightest (most economical) and heaviest (least economical) version.

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3. The transition to WLTP of passenger car

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WLTP will officially apply to new types of cars from September 2017. New types of cars are vehicle models that are introduced on the market for the first time. WLTP will apply to all new car registrations from September 2018 EU measures for end-of-series cars allow for a limited number of unsold vehicles in stock that were approved under the old test (NEDC) to be sold the following year, that is until September 2019. WLTP will officially apply to new types of cars from September 2017. New types of cars are vehicle models that are introduced on the market for the first time. Manufacturers may already start requesting WLTP approvals for new car types when the legislation comes into force in the European Union (no sooner than end July 2017). WLTP will apply to all new car registrations from September 2018. EU measures for end-of-series cars should allow for a limited number of unsold vehicles in stock that were approved under the old test (NEDC) to be sold the following year, that is until September 2019.