Division 4.5: Calculation of the statistical margin - Commission Implementing Decision (EU) 2019/313 of 21 February 2019 on the approval of the technology used in SEG Automotive Germany GmbH High efficient 48V motor generator (BRM) plus 48V/12V DC/DC converter for use in conventional combustion engine and certain hybrid powered light commercial vehicles as an innovative technology for reducing CO2 emissions from light commercial vehicles pursuant to Regulation (EU) No 510/2011 of the European Parliament and of the Council (Text with EEA relevance)

The statistical margin of the results of the testing methodology caused by the measurements shall be quantified. For each operating point the standard deviation shall be calculated in accordance with Formula 18:

Formula 18

The standard deviation of the efficiency value of the efficient 48V motor generator plus the 48V/12V DC/DC converter ( $s_{η_{TOT}}$ ) shall be calculated in accordance with Formula 19:

Formula 19

The standard deviation of the motor generator and of the 48V/12V DC/DC converter efficiency leads to an uncertainty in the CO₂ savings ( $s_{C_{{CO}_{2}}}$ ). That uncertainty is calculated in accordance with Formula 20:

Formula 20

Division 4.5 Calculation of the statistical margin