The Worldwide Harmonised Light Vehicles Test Procedure (WLTP) is a comprehensive global standard designed to measure vehicle emissions and fuel consumption. It was developed to provide more accurate and realistic data that reflects real-world driving conditions, addressing the limitations of previous testing procedures like the New European Driving Cycle (NEDC).
The Development of the WLTP
The WLTP was adopted by the Inland Transport Committee of the United Nations Economic Commission
for Europe (UNECE) as part of the Global Technical Regulations. Its development involved collaboration among major automotive markets, including China, Japan, the United States, and the European Union. The final version of the WLTP was released in 2015, marking a significant milestone in the effort to harmonize vehicle emissions testing on an international scale.
One of the primary goals of the WLTP is to align laboratory estimates of fuel consumption and emissions with real-world driving conditions. This alignment is crucial as CO2 targets become increasingly important for vehicle manufacturers' economic performance. By providing a standardized testing procedure, the WLTP creates a level playing field for manufacturers in the global market.
Key Features of the WLTP
The WLTP introduces several key features that distinguish it from previous testing procedures. It is designed to be more representative of modern driving conditions, with a test cycle that is 10 minutes longer than the NEDC, covering a distance of 23.25 km. The WLTP includes higher average and maximum speeds, steeper accelerations and decelerations, and a wider range of driving conditions, such as urban, suburban, main road, and highway scenarios.
Additionally, the WLTP considers the impact of optional equipment on a vehicle's performance. This means that emissions data reflects the actual configuration of individual vehicles, providing consumers with more reliable information. The testing procedure also includes strict guidelines for laboratory conditions, such as ambient temperature, fuel quality, and tire selection, ensuring consistency and comparability across different tests.
The Impact of the WLTP
The implementation of the WLTP has significant implications for vehicle manufacturers and consumers. For manufacturers, the new testing procedure provides a more accurate reflection of a vehicle's emissions and fuel consumption, which can impact their ability to meet regulatory targets. In the European Union, for example, the WLTP is used to verify that a manufacturer's fleet does not exceed the average CO2 emissions target of 95 g/km.
For consumers, the WLTP offers more reliable information about a vehicle's performance, helping them make informed decisions when purchasing a new car. By providing a standardized and globally harmonized framework, the WLTP represents a significant advancement in vehicle emissions testing, benefiting both manufacturers and consumers alike.
