WORLDWIDE HARMONIZED LIGHT VEHICLE TEST PROCEDURE (WLTP)
The new test method for fuel economy and emissions.
NEDC TO WLTP: WHAT’S CHANGING?
With advances in vehicle technology and changes in driving conditions, the near-40-year-old NEDC driving cycle test is being replaced. To give you a more accurate way of calculating and comparing a car’s fuel consumption and emissions, the new WLTP test introduces more realistic testing conditions, so that lab measurements better reflect the on-road performance of a car.
Dynamic tests which are more representative of real-driving behaviour.
Test lasts 30 minutes, an increase of 10 minutes.
More dynamic phases: 52% urban and 48% non-urban.
23.25 kilometres long, over twice the old distance.
Average & Maximum Speeds
Average speed is 46.5km/h (an increase of 12.5km/h) while top speed is raised to 131km/h.
Additional vehicle options (impacting CO2 and consumption) are taken into account.
Each vehicle has different, rather than fixed, gear shift points.
Measurements now taken at 23°C (and CO2 values corrected to 14°C) vs 20-30 °C.
“HYBRID IS THE BACKBONE OF OUR POWERTRAIN PROGRAMME AND WILL HELP US CUT OUR VEHICLE CARBON EMISSIONS BY 90% BY 2050 COMPARED TO 2010.”Dr. Johan Van Zyl, President and CEO of Toyota Motor Europe
EVERYDAY TESTS, REALISTIC RESULTS
The new WLTP tests will ensure that lab measurements now better reflect the situations you will experience in everyday life. This means that fuel consumption and emissions values displayed for new cars are a far better representation of what you are actually likely to achieve.
Will my car’s real-world fuel consumption change?
No, your actual fuel consumption will remain the same, but it’s likely that your vehicle will get a higher official CO2 value and fuel consumption values due to the more rigorous WLTP test cycle – closer to what you observe.
Will WLTP fuel consumption and CO2 values reflect what I can expect?
Like NEDC, WLTP continues to be a laboratory test. As driving styles and conditions vary, some variance between official values and what a consumer achieves is possible.
Why has the NEDC value of my car suddenly increased?
For a transitional period of time (until the end of 2020), NEDC values will still be generated in parallel to WLTP values. As the old NEDC procedure can no longer be used, regulations mandate that WLTP CO2 values will be translated back to NEDC-equivalent values by means of a ‘correlation exercise’. This will be carried out using either a simulation tool developed by the European Commission or through physical re-testing, which may result in higher NEDC CO2 values for your car as this will be an updated version of NEDC (based on WLTP).
Will WLTP test for other air quality pollutants?
Yes, WLTP is also used to measure substances such as carbon monoxide (CO), hydrocarbons (HC) and oxides of nitrogen (NOx) and particles (PM/PN).
When will light commercial vehicle values change?
WLTP certification will be mandatory for all light commercial vehicles (Categories N1 (ii), N1 (iii) and N2) from 1 September 2019, one year after passenger cars.