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Commission Implementing Decision (EU) 2019/314Dangos y teitl llawn
Commission Implementing Decision (EU) 2019/314 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 passenger cars as an innovative technology for reducing CO2 emissions from passenger cars pursuant to Regulation (EC) No 443/2009 of the European Parliament and of the Council (Text with EEA relevance)
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4.METHOD 2 (‘COMBINED METHOD’)U.K.
4.1. Efficiency of the 48V motor generator plus the 48V/12V DC/DC converter U.K.
The efficiency of the 48V motor generator plus the 48V/12V DC/DC converter shall be determined in accordance with ISO 8854:2012, with the exception of the elements specified in this section.
Evidence shall be provided to the type approval authority that the speed ranges of the efficient 48V motor generator are consistent with those set out in Table 1.
The measurements shall be conducted at different operating points, as set out in Table 1. The efficient 48V motor generator plus the 48V/12V DC/DC converter current intensity shall be defined as half of the rated current of the 48V/12V DC/DC converter for all operating points.
The rated current of the 48V/12V DC/DC converter is defined as the output nominal power of the 48V/12V DC/DC converter divided by 14,3V. The nominal power of the 48V/12V DC/DC converter shall be the continuous output power at the 12V side guaranteed by the manufacturer of the DC/DC converter at the conditions specified in the ISO 8854:2012.
For each speed the voltage and the output current of the motor generator shall be kept constant, the voltage at 52 V.
The efficiency at each operating point shall be calculated in accordance with Formula 12:
Formula 12
All efficiency measurements are to be performed consecutively at least five (5) times. The average of the measurements at each operating point ( 
The efficiency of the generation function (ηTOT) shall be calculated in accordance with Formula 13:
Formula 13
The measurement set up has to allow the measurement of the 48V motor generation efficiency alone.
4.2. Demonstration of conservativeness of the 48V motor generator plus 48V/12V DC/DC converter efficiency determination U.K.
In order to use the procedure specified in 4.1 for the determination of ηTOT, it has to be demonstrated that the efficiency of the 48V motor generator alone obtained with the conditions specified in 4.1 is lower than the efficiency obtained with the conditions specified in 3.1.
4.3. Saved mechanical power U.K.
The 48 V motor generator plus the 48V/12V DC/DC converter generation function lead to saved mechanical power under real-world conditions (ΔPmRW) and type approval conditions (ΔPmTA) as set out in Formula 14.
Formula 14
ΔPm = ΔPmRW – ΔPmTA
Where the saved mechanical power under real-world conditions (ΔPmRW) shall be calculated in accordance with Formula 15 and the saved mechanical power under type-approval conditions (ΔPmTA) in accordance with Formula 16:
Formula 15
Formula 16
where
PRW
:
Power requirement under ‘real-world’ conditions [W], which is estimated at 750W
PTA
:
Power requirement under type-approval NEDC conditions [W], which is estimated at 350W
ηB
:
Efficiency of the baseline alternator [%], which is 67 %
4.4. Calculation of the CO2 savings U.K.
The CO2 savings of the 48 V motor generator plus the 48V/12V DC/DC converter shall be calculated in accordance with Formula 17:
Formula 17
Where:
v
:
Mean driving speed of the NEDC [km/h], which is 33,58 km/h
VPe
:
Consumption of effective power specified in Table 2
CF
:
Conversion factor (l/100 km) - (g CO2/km) [gCO2/l] as defined in Table 3
4.5. Calculation of the statistical margin U.K.
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 ( 
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 ( 
Formula 20
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