WLTP

WLTP

Worldwide Harmonised Light-Duty Vehicles Test Procedure (WLTP)

WLTP is a new testing method to estimate a vehicle’s emissions and fuel consumption. This procedure is based on real recorded driving data. It will help to simulate realistic driving even under laboratory conditions. That is why WLTP not only takes into consideration various situations and speeds but also a vehicle’s different equipment variants and weight classes.

WLTP explained on video

The video will show you the important facts for the WLTP measuring technique.

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Why WLTP?

Why WLTP?

WLTP revises consumption values

The previous standard New European Driving Cycle (NEDC) was introduced in 1992 and is now outdated and does not accurately represent the individual, day-to-day driving behaviour. In contrast, the new WLTP standard aims to ensure that the consumption values measured during a model’s type approval testing are more realistic. The aim is to ensure that test conditions better reflect real-world driving, so CO2 emissions and/or fuel consumption figures for vehicles may increase compared to those NEDC figures that are available now.

What are the benefits of WLTP?

What are the benefits of WLTP?

WLTP will introduce much more realistic testing conditions. These include:

  • More realistic driving behaviour
  • A greater range of driving situations (urban, suburban, main road, motorway)
  • Longer test distances
  • More realistic ambient temperatures, closer to the European average
  • Higher average and maximum speeds
  • More dynamic and representative accelerations and decelerations
  • Enables best and worst-case values on consumer information, reflecting the options available for similar car models
  • ...
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What is 3P-WLTP?

Historically, in NZ different manufacturers have used different test regimes to measure fuel consumption and emissions. Examples include NEDC, Japan, ADR (Australian) and more recently WLTP.

To create an even playing field, the Clean Car Programme requires a conversion to a common standard – in this case 3P-WLTP. Therefore, moving forward we will only be communicating 3P-WLTP for consistency (and simplicity) with the Clean Car Programme.

3P-WLTP Conversion

The WLTP consists of 4 different sub-parts (phases), each one with a different maximum speed as below. As the speeds of the Extra high “phase” of the WLTP can’t be legally achieved on NZ roads, the government decided to use a WLTP standard, including only the first 3 phases, the 3P-WLTP

  • Low, up to 56.5 km/h
  • Medium, up to 76.6 km/h
  • High, up to 97.4 km/h
  • Extra high, up to 131.3 km/h
 

Will WLTP end the discrepancy between the labroratory and on-road performance of cars?

Even though the Worldwide Harmonised Light Vehicle Test Procedure (WLTP) will provide a far more realistic representation of conditions encountered on the road than the old NEDC lab test (New European Driving Cycle), it will not cover all possible variations. Moreover, each individual driver will continue to have a different driving style: one driver might accelerate faster, take corners faster or brake more suddenly than another who might drive more conservatively.

Given that driving behaviour, traffic and weather conditions will continue to differ from one country to another, there will still be a difference between emissions measured in lab conditions and the real world. However, as there is no single real-world emission value, only values obtained by standardised laboratory tests allow us to directly compare the emissions and fuel consumption of different car models from different car manufacturers.

WLTP
NEDC vs WLTP

NEDC vs WLTP

In Autumn 2017, WLTP replaced the NEDC measuring procedure. New testing parameters ensure more realistic values. The new testing procedure has a modified driving cycle and stricter test specifications. These include a longer time span for the measurement along with a higher maximum speed.

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