New emissions standards - WLTP
The replacement of the NEDC by WLTP - Worldwide Harmonized Light Vehicle Test Procedure, the new test procedure applicable to all light vehicles, brings to the market a test procedure closer to the actual conditions of use, avoiding the current differences between countries and brands and allowing a more real comparison between vehicles.
Whenever a vehicle is made available to the market, it must necessarily pass through tests in order to guarantee its homologation. These tests, carried out on fuel consumption and CO2 emissions, have been made under the NEDC (New European Driving Cycle) method since 1973. The new WLTP protocol replaces the current NEDC and aims to make testing procedure consistent across the world, avoiding differences between countries and brands, and to allow a better comparison between vehicles.
The NEDC is replaced by WLTP, which ensures greater proximity to the actual conditions of use, allowing the calculation of the emissions of pollutants (NOx, particles, etc.) and CO2, as well as the fuel consumption of light vehicles (vans and passenger cars).
The WLTP test model delivers more realistic results, using, for example, a higher average speed, faster acceleration and deceleration, less downtime or more realistic traffic conditions. It will also take into account optional equipment which may also have impact on the CO2 emissions. The WLTP test cycle is now accompanied by a public road test known as Real Driving Emissions (RDE) in order to validate the laboratory tests.
Summary of most visible changes:
What changes at tax level?
To allow comparison with models approved by the old protocol, the WLTP results will be transformed into an intermediate value between the two test cycles (NEDC / WLTP) by the end of 2018. The basis for calculating the tax will remain and there will be no changes in the tax level for the time being (provided that OEMs do not anticipate the application of the new standard).
With the total change to the WLTP model, more demanding and in real conditions, it’s estimated some impact on the CO2 values, for more real values and consequently higher.
When will these new changes come into force?
In September 2017, WLTP became the official test cycle for new vehicles. From September 2018, WLTP will come into force and will be mandatory for all passenger vehicles, including models already available in the market.
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