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- Original (As adopted by EU)
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This is the original version as it was originally adopted in the EU.
This legislation may since have been updated - see the latest available (revised) version
The following steps are to be taken to determine the CO2 savings and to determine whether the threshold value of 1 g CO2/km is met:
:
Calculate the power savings;
:
Calculate the CO2 savings;
:
Calculate the error in the CO2 savings;
:
Verify the threshold value.
For each of the 10 measurements the power which is used is to be calculated by multiplying the installed voltage with the measured current. This is to result in 10 values. Each value is to be expressed in four decimals. Then the mean value of the used power is to be calculated, which is the sum of the 10 values for the power divided by 10.
The resulting power savings are to be calculated with the following formula:
Where:
:
Power savings in W;
:
Power of the baseline, which is 137 W;
:
Mean value of the used power of the eco-innovation in W.
The formulae to calculate the CO2 savings of the eco-innovation are:
Where in these formulae CO2 is the CO2 savings in g CO2/km.
The input data for the formulae (2) and (3) are:
:
Saved electrical power in W, which is the result of step 1
:
Usage factor which is 0,33 for a low beam lamp
:
mean driving speed of the NEDC, which is 33,58 km/h
:
consumption of effective power for petrol-fuelled vehicles, which is 0,264 1/kWh
:
consumption of effective power for diesel-fuelled vehicles, which is 0,22 1/kWh
:
efficiency of the alternator, which is 0,67
:
conversion factor for petrol fuel, which is 2 330 g CO2/l
:
conversion factor for diesel fuel, which is 2 640 g CO2/l
The statistical error in the CO2 savings is to be determined in two steps. In the first step the error value of the power is to be determined as a standard deviation being equivalent to a confidence interval of 68 %.
This is to be done by formula (4).
Where:
:
measurement value [W];
:
number of measurements, which is 10.
Then the error in the CO2 savings is to be determined using the propagation law, which is expressed in formula (5).
Where:
mean total error of the CO2 saving (gCO2/km)
sensitivity of calculated CO2 saving related to input value xi
error of input value (W)
Substituting formula (2) in formula (5) leads for petrol fueled vehicles to:
Where:
:
the error in the CO2 savings (g CO2/km);
:
the error in the power consumption (W).
Substituting formula (2) in formula (5) leads for diesel fueled vehicles to:
Where:
:
the error in the CO2 savings (g CO2/km);
:
error in the power consumption (W).
By means of formula (8) the threshold value is verified. The minimum threshold value is 1,0 g CO2/km.
Where:
:
minimum threshold (g CO2/km)
:
total CO2 saving (g CO2/km), which must be expressed in 4 decimals,
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Original (As adopted by EU): The original version of the legislation as it stood when it was first adopted in the EU. No changes have been applied to the text.
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