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1.12.6 Worldwide Harmonized
Light-Duty Vehicle Test Procedures
(WLTP) Calculation Inputs
The following attributes are required as part of
the WLTP calculation for completed vehicles
Mass of the Completed Vehicle
All modifications and changes that effect the
actual mass of the vehicle must be taken into
account. The definition of actual mass is
described under the provisions of regulation
2017/1151 Annex XXI. The actual mass of the
completed vehicle needs to be provided for the
front and rear axle. This weight split will be
important where the completed vehicle has mixed
tires between the front and rear.
Frontal Surface Area
All modifications and changes that effect the
frontal surface area of the completed vehicle
must be taken into account. For further
information please see information later in this
section.
Tire Rolling Resistance
Any changes in tires fitted to the completed
vehicle must be taken into account. The efficiency
class and tire class is needed to determine the
correct calculation. This can be found on the tire
label as per the example below.
FORD RANGER 2020
E309537
Exceeding Attribute Limits
As a requirement of the Vehicle Converter to use
the base vehicle approval, the Vehicle Converter
must stay within the defined limits of the BEMM
and the Emissions Type Approval applicable to
the vehicle. It is the responsibility of the Vehicle
Converter to ensure they stay within these defined
limits to remain compliant with the emissions
performance. If the Vehicle Converter wishes to
exceed the limits they must seek clarification with
the relevant technical service or type approval
authority. In this case, the base approval may
become invalid and the Vehicle Converter may
need to re-certify the vehicle against the exceeded
limits.
Date of Publication: 09/2020
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