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Commission Implementing Decision (EU) 2019/314Show full title
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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3.METHOD 1 (‘SEPARATE METHOD’)
3.1. Efficiency of the 48V motor generator
The efficiency of the 48V motor generator 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 rotational frequency 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 current intensity shall be defined as half of the rated current for all operating points. For each rotational frequency, the voltage and the output current of the motor generator shall be kept constant, the voltage at 52V.
Table 1
Operating points
| Operating pointi | Holding time[s] | Rotational frequencyni [min– 1] | Frequencyhi |
|---|---|---|---|
| 1 | 1 200 | 1 800 | 0,25 |
| 2 | 1 200 | 3 000 | 0,40 |
| 3 | 600 | 6 000 | 0,25 |
| 4 | 300 | 10 000 | 0,10 |
The efficiency at each operating point shall be calculated in accordance with Formula 1:
Formula 1
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 (ηMG) shall be calculated in accordance with the following Formula 2:
Formula 2
3.2. Efficiency of the 48V/12V DC/DC converter
The efficiency of the 48V/12V DC/DC converter shall be determined under the following conditions:
Output voltage of 14,3V
Output current of 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.
The efficiency of the 48V/12V DC/DC converter shall be measured at least five (5) times consecutively. The average of all the measurements ( 
3.3. Total efficiency and saved mechanical power
The total efficiency of the 48 V motor generator plus the 48V/12V DC/DC converter shall be calculated using Formula 3:
Formula 3
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 NEDC conditions (ΔPmTA) as set out in Formula 4.
Formula 4
ΔPm = ΔPmRW – ΔPmTA
Where the saved mechanical power under real-world conditions (ΔPmRW) shall be calculated in accordance with Formula 5 and the saved mechanical power under type-approval NEDC conditions (ΔPmTA) in accordance with Formula 6:
Formula 5
Formula 6
where
PRW
:
Power requirement under ‘real-world’ conditions [W], which is estimated at 750W
PTA
:
Power requirement under NEDC type-approval conditions [W], which is estimated at 350W
ηB
:
Efficiency of the baseline alternator [%], which is 67 %
3.4. Calculation of the CO2 savings
The CO2 savings of the 48 V motor generator plus the 48V/12V DC/DC converter shall be calculated in accordance with Formula 7:
Formula 7
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:
Table 2
Consumption of effective power
| Type of engine | Consumption of effective power (VPe)[l/kWh] |
|---|---|
| Petrol | 0,264 |
| Petrol Turbo | 0,280 |
| Diesel | 0,220 |
CF
:
Conversion factor (l/100 km) - (g CO2/km) [gCO2/l] as defined in Table 3
Table 3
Fuel conversion factor
| Type of fuel | Conversion factor (l/100 km) - (g CO2/km) (CF)[gCO2/l] |
|---|---|
| Petrol | 2 330 |
| Diesel | 2 640 |
3.5. Calculation of the statistical margin
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 8:
Formula 8
The standard deviation of the efficiency value of the efficient 48V motor generator ( 
Formula 9
The standard deviation of the efficiency value of the 48V/12V DC/DC converter ( 
Formula 10
The standard deviation of the motor generator efficiency ( 
Formula 11
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