WLTP is the acronym for "Worldwide Harmonized Light-Duty Vehicles Test Procedure“. This is the test procedure in the EU for exhaust-emissions and fuel-consumption values for new vehicles. This test procedure has been valid for new type approvals for M and N1 category vehicles in the European Union from 1st September 2017 and all new vehicle registrations from 1st September 2018.
NEDC is the acronym for “New European Driving Cycle” and is the previously applicable test cycle for determining exhaust-emission and fuel-consumption values in the EU and some countries in the rest of the world.
Whereas with the old test, the test values were based on a synthetic driving profile, i.e. New European Driving Cycle (NEDC), the WLTP cycle (WLTC) is based on data collected world-wide during road use. It therefore permits a better representation of everyday driving profiles. The NEDC is based on two driving-profile phases: urban and extra-urban. The combined CO2 and fuel-consumption values as well as the combined pollutant emissions are obtained based on these. The WLTP driving cycle is divided into four parts with different average speeds: low, medium, high and extra high. Each part comprises multiple driving, stationary, acceleration and braking phases. In addition to the driving profile, the measuring procedure has been adapted and the current vehicle technology has been adapted with the WLTP. The specifications, e.g. at what temperature the vehicle is to be tested or what tyre pressure has to be set are more strictly defined. The new test cycle and the new test procedure are characterised by the following:
The specification of best and worst-case values in the WLTP in the user information reflects the possible influence of the optional equipment. It is possible to determine a vehicle specific, equipment-dependent value by interpolating between the worst and best case specification values.
Due to all these changes, the WLTP provides a more realistic basis for the determination of fuel consumption and emissions data for vehicles.
The WLTP test was developed with the objective of standardising the determination of pollutant and CO2 emissions as well as fuel consumption data through its use as a global test cycle. The "core" of the WLTP test is the same world-wide. However, the European Union and other regions will adapt it to their respective road traffic regulations and requirements. There are also numerous countries who will not be introducing the WLTP, for example the US.
The WLTP is expected to reflect the existing road conditions more realistically than the NEDC, but will not cover all the possible variations. Moreover, each individual driver will continue to have a very personal driving style: While one person accelerates more rapidly, drives faster into bends or brakes more abruptly, another drives more defensively. Furthermore, during real operation, the weather conditions (e.g. head wind/ tailwind, different ambient temperatures), use (e.g. full loading, trailer operation), ancillary loads (e.g. radio, air conditioning etc.), altitude, inclines and the route profiles (only short trips, only motorway etc.) are additional factors which significantly affect fuel consumption.
In light of the differences with regard to driving behaviour, traffic situation and weather conditions in the individual countries, which will continue to apply in the future, the deviations between the emissions measured under laboratory and real conditions will also persist. However, because a "true" emissions and fuel consumption value does not exist in practice, it is only possible to make direct comparisons of the emissions and fuel consumption of the various models of different automotive manufacturers using measured values obtained during standardised laboratory tests.
During the laboratory tests in the context of the European type approval of passenger vehicles, the CO2 emissions, which bear a direct relation to fuel consumption, pollutant emissions and the energy-consumption values of alternative drives, including electrically driven vehicles are measured.
Laboratory tests play a decisive role in the process of introducing a motor vehicle onto the EU market. Before vehicles are launched on the market, they are subjected to certain tests by a technical service in accordance with EU law. If all the registration-relevant requirements are met, a national authority issues the manufacturer an EU type approval form authorising the sale of that particular vehicle type in the EU. Every vehicle produced for the EU market is provided with a Certificate of Conformity (so-called CoC document), which, in addition to other information, includes the CO2 emission values from the laboratory test. On the basis of this document, registration of the vehicle is possible everywhere in Europe.
To enable motorists to make a well-founded purchase decision based on fuel consumption, car dealers and manufacturers provide the consumer with relevant information, including an indication of the CO2 emissions and fuel consumption for a passenger car, which is displayed on or near all new vehicles in the showrooms. The design of these labels is specified at a national level (and therefore differs from country to country). However, they all include the CO2 values from the standardised laboratory tests, which are also contained in the Certificate of Conformity (CoC document).
In most EU member states, the amount of the registration tax (one-off) and/or the vehicle tax (annual) depends on the CO2 emissions of the vehicle. This taxation is based on the CO2 values obtained during the laboratory testing contained in the Certificate of Conformity (CoC document). In the UK, NEDC CO2 values will continue to be used for taxation purposes until April 2020.
The WLTP legislative package has been fully valid since 27.07.2017. This means that from 01.09.2017, new vehicle types will be type-approved in accordance with WLTP. From 01.09.2018, all new vehicles (new registrations) will be type-approved according to WLTP. There are legal provisions in place for end-of-series vehicles, which make it possible to stock a limited number of vehicles approved according to the old procedure and to sell these by 31.08.2019.
The actual individual fuel consumption depends on a wide variety of factors (i.e. ambient temperature, traffic situation, driving style, inflation pressure, altitude, inclines, head wind/ tailwind, etc.). The WLTP should however, deliver more realistic CO2 emissions and fuel consumption values.
In practice and with otherwise unmodified technology, the actual fuel consumption will not change. For one and the same vehicle, the WLTP test will result in higher CO2 and fuel-consumption values than the NEDC test for the simple reason that the driving profiles and the measurement conditions (maximum speeds, dynamics, etc.) differ between the two test cycles. This means that the WLTP is more representative of today's road traffic conditions than the NEDC. The CO2 value according to WLTP therefore corresponds more closely to customer expectations owing to the changed measurement methods.
Vehicles tested under WLTP are likely to have different CO2 values compared to current NEDC. Until April 2020, a NEDC 2.0 value generated from the WLTP test cycle using a correlation will be used for the purposes of taxation in the UK. From April 2020, the WLTP CO2 figure will be used for taxation purposes.
Before the start of the transition period from NEDC to WLTP, which begins from 01.09.2017, only the CO2 values measured according to the NEDC test continue to apply for all registered vehicles.
When a new car is type approved after 01.09.2017, the official Certificate of Conformity for the vehicle contains both the CO2 emissions values according to the new laboratory test (WLTP) as well as the NEDC values simulated using the correlation tool or actually measured using the updated NEDC test.
Accordingly, after 01.09.2017, when the change from the old NEDC test to WLTP is complete, you may find different CO2 values in the CoC document for your vehicle. From 01.09.2018, both the NEDC as well as the WLTP CO2 values must be indicated for all new vehicles. From 2021, it is expected that only the WLTP value will be indicated in the CoC.
NEDC 1.0 values are values, which were determined through the previous NEDC test methods. With NEDC 2.0 vehicles are already typed with WLTP standard; the insofar indicated NEDC values are values which are derived (correlated) from WLTP.
Government legislation requires all manufacturers to currently publish fuel consumption based on NEDC. We only publish officially approved CO2 and fuel consumption information. Because we do not yet currently have any WLTP-homologated models on the market, we are as yet unable to provide any values. Because the laws on customer communications have not yet been adapted at the start date for WLTP (01.09.2017), the NEDC remains binding.
The legislation stipulates that registrations for all new vehicles from 01.09.2018 are only possible with at least Euro 6c.
In the context of the model cycles, we ensure that all of our vehicles comply with the standards and regulations required by the legislators over the entire duration of their sale and delivery. Unfortunately, it cannot be ensured that future standards be taken into account over this entire period.
The Euro 6d-Temp standard will be valid for new type-approved vehicles from 01.09.2017. This means that all the new models presented to the legislators for type approval must comply with this emission standard. For existing models and those currently for sale, the emission standard Euro 6c will only become compulsory for registration from 01.09.2018.
Type approvals/registrations which have already been completed remain valid under the current law, even if new standards come into force.
The new Eu6c standards do not apply retrospectively, so the provisions and requirements valid at the time of registration apply, and vehicles already registered within the UK will not require re-testing. We cannot confirm or comment on possible changes in future UK legislation that may affect vehicles that only meet older emissions standards.
No, it is not possible to retrofit a
A petrol particle filter is a particle filter for petrol engines. It enables the reduction of fine soot particulate matter emissions.
Our vehicles with petrol engines do not currently feature particle filters. Our vehicles with diesel engines from EU4+ are all equipped with a diesel particle filter.
To date, particle filters are only familiar from diesel engines, however, direct injection technology, which is increasingly being used in petrol engines, increases particulate matter emissions in comparison with intake manifold injection. Because the fuel is injected directly into the combustion chamber, individual droplets can be deposited on the cylinder walls, pistons or valves, where they partly combust incompletely and remain as minute soot particles.
 t-online.de report: VW bringt Partikelfilter für Benzinmotoren (VW introduces particle filters for petrol engines) 3/8/2016, 4:42 p.m. | Hanne Schweitzer, SP-X
As is the case with the particle filters already used on diesel vehicles, we do not anticipate any impairment to the service life of petrol vehicles featuring a particle filter.
No maintenance is required or envisaged. There is no effect on the service life of the engine because its thermodynamic and mechanical limits are not exceeded. As a rule, regeneration of the filter is passive, so that the driver is unaware of it taking place. Only in the event of lengthy vehicle operation at very low engine loads in conjunction with short distances and frequent cold starting, are the operating parameters of the engine configured to allow passive regeneration to take place (e.g. higher shifting speeds).
Please appreciate that we are unable to make any specific statements on a possible retrofit of already registered vehicles with regard to model updates at this point in time. You may however rest assured that
In essence, nothing. The petrol particulate filter is requied to comply with RDE (Real Driving Emissions) limit value requirements.
RDE stands for Real Driving Emissions, which comes into force alongside the WLTP. RDE involves monitoring of vehicle emissions during real drive cycles using Portable Emissions Measuring System (PEMS). This has been made possible through recent technological advances in emissions measuring equipment. To comply with RDE, vehicles will need to stay within certain emissions limits during tests which will be carried out in real-world conditions.
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*Data determined in accordance with the measurement method required by law. Since 01 September 2018 all new cars are approved in accordance with the Worldwide Harmonized Light Vehicles Test Procedure (WLTP), a more realistic test procedure to measure fuel consumption and CO₂ emissions. You can find more information on WLTP at www.porsche.com/wltp. From 01 January 2019, all fuel consumption figures are shown as determined in accordance with WLTP. CO₂ figures will be shown as NEDC-equivalent values, as CO₂ based taxation will continue to be based on an NEDC value (derived from WLTP) until 06 April 2020. Fuel economy and CO₂ emission figures are only intended as a means of comparing different types of vehicles tested under the same test cycle. New WLTP homologated vehicles are therefore not directly comparable with any vehicles tested under NEDC.
Values are provided for comparison only. To the extent that fuel consumption or CO₂ values are given as ranges, these do not relate to a single, individual car and do not constitute part of the offer. Extra features and accessories (attachments, tyre formats etc.) can change relevant vehicle parameters such as weight, rolling resistance and aerodynamics which may result in a change in fuel consumption and CO₂ values. Additionally, weather and traffic conditions, as well as individual driving styles, can all affect the actual fuel consumption, electricity consumption, and CO₂ emissions of a car.