1.
WLTP Annex 8:
OVC-HEV: 𝑨𝑬𝑹 𝑪𝒊𝒕𝒚 : „Measurement“ versus „Calculation” Idea: AER city calculation for OVC-HEV according to PEV

2. OVC-HEV: 𝑨𝑬𝑹 𝑪𝒊𝒕𝒚 : „Measurement“ versus „Calculation” Idea: AER city calculation for OVC-HEV according to PEV calculation scheme (§ and § of Annex 8)
Matthias Nägeli

3. OVC-HEV: 𝑨𝑬𝑹 𝑪𝒊𝒕𝒚 : „Measurement“ versus „Calculation” Idea: AER city calculation for OVC-HEV according to PEV calculation scheme (§ and § of Annex 8)
In the Subgroup EV meeting in Brussels (June 2015), there were simulation results presented which showed that the approach and the idea are working in the case that the considered vehicle has the first engine start by driving the charge-depleting Type 1 test at the SoC minimum of the REESS
averaged
weighted
measured
Weighted
Matthias Nägeli

4. OVC-HEV: 𝑨𝑬𝑹 𝑪𝒊𝒕𝒚 : „Measurement“ versus „Calculation” Concerns: AER city calculation for OVC-HEV according to PEV calculation scheme (§ and § of Annex 8)
Requirement on the 𝑨𝑬𝑹 𝒄𝒊𝒕𝒚 calculation scheme for OVC-HEV:
The calculation scheme has to work in each and every occurring case
Comparison of the city cycle test and of the whole cycle test
1. Determination of 𝐴𝐸𝑅 𝑐𝑖𝑡𝑦 via city cycle test:
engine start which determines 𝐴𝐸𝑅 𝑐𝑖𝑡𝑦 is SoC-triggered
2. Determination of AER city via whole cycle test:
The load collective of the whole cycle test is different to the city cycle test
There may be engine starts in the test which would not occur in the city cycle test
Concern
It’s impossible for the technical authority (without knowing the vehicle strategy) to identify which engine start in the whole cycle test corresponds to the SoC-triggered engine start of the city cycle test (but the quality of the engine start is essential for the UBE determination which is required for the AER city calculation via the whole cycle test)
Consequence
It’s hard to determine the correct UBE for the AER city calculation from the whole cycle test
Matthias Nägeli

5. OVC-HEV: 𝑨𝑬𝑹 𝑪𝒊𝒕𝒚 : „Measurement“ versus „Calculation” Discussed solution in the Subgroup EV meeting in Brussels: AER city calculation for OVC-HEV according to PEV calculation scheme (§ /§ of Annex 8) via worst case approach
For the AER city determination, the manufacturer shall be allowed to
either determine this value by driving the city cycle test
or to calculate the AER city value by using the worst case UBE value - determined by the first engine start in the whole cycle test (the determined UBE value will always be worst case and never be a best case value)
Matthias Nägeli

6. OVC-HEV: 𝑨𝑬𝑹 𝑪𝒊𝒕𝒚 : „Measurement“ versus „Calculation” Analysis of the criterion for the UBE determination – worst case
𝑷 𝒎𝒂𝒙, 𝑴
𝑷 𝒎𝒂𝒙, 𝑳 L M
City cycle test
Available power as a function of the SoC. P
SoC
available power comes
below requ. power
Required power
Purely electrically driven
Engine start
𝑷 𝒎𝒂𝒙, 𝒆𝒙𝑯 L M H
exH
𝑷 𝒎𝒂𝒙, 𝑯
𝑷 𝒎𝒂𝒙, 𝑴
𝑷 𝒎𝒂𝒙, 𝑳
Whole cycle test
Available power as a function of the SoC.
Required power
SoC
available power comes
below requ. power P
Purely electrically driven
Engine start

7. Available power as a function of the SoC.
OVC-HEV: 𝑨𝑬𝑹 𝑪𝒊𝒕𝒚 : „Measurement“ versus „Calculation” Analysis of the criterion for the UBE determination – worst case
The usable battery energy determined from the whole cycle test is a worst case compared to the case that a city cycle test was driven.
Whole cycle test L M H
exH L M H
exH L M H
exH L M H
exH P
available power comes
below requ.
power
Available power as a function of the SoC.
𝑷 𝒎𝒂𝒙, 𝒆𝒙𝑯
𝑷 𝒎𝒂𝒙, 𝑯
Required power
𝑷 𝒎𝒂𝒙, 𝑴
𝑷 𝒎𝒂𝒙, 𝑳
available power comes
below requ. power
SoC
City cycle test L M L M L M L M L M L M L M L M L M L M L M L M L M L M
Purely electrically driven
Engine start

8. OVC-HEV: 𝑨𝑬𝑹 𝑪𝒊𝒕𝒚 : „Measurement“ versus „Calculation” Analysis of the criterion for the UBE determination – worst case
𝑷 𝒎𝒂𝒙, 𝑴
𝑷 𝒎𝒂𝒙, 𝑳 L M
City cycle test
Available power as a function of the SoC. P
SoC
available power comes
below requ. power
Required power
Purely electrically driven
Engine start
𝑷 𝒎𝒂𝒙, 𝒆𝒙𝑯 L M H
exH
𝑷 𝒎𝒂𝒙, 𝑯
𝑷 𝒎𝒂𝒙, 𝑴
𝑷 𝒎𝒂𝒙, 𝑳
Whole cycle test
Available power as a function of the SoC.
Required power
SoC
available power comes
below requ. power P
Purely electrically driven
Engine start

9. Available power as a function of the SoC.
OVC-HEV: 𝑨𝑬𝑹 𝑪𝒊𝒕𝒚 : „Measurement“ versus „Calculation” Analysis of the criterion for the UBE determination – worst case
Whole cycle test L M H
exH L M H
exH L M H
exH L M H
exH
The usable battery energy determined from the whole cycle test is a worst case compared to the case that a city cycle test was driven. P
available power comes
below requ. power
Available power as a function of the SoC.
𝑷 𝒎𝒂𝒙, 𝒆𝒙𝑯
𝑷 𝒎𝒂𝒙, 𝑯
Required power
𝑷 𝒎𝒂𝒙, 𝑴
𝑷 𝒎𝒂𝒙, 𝑳
available power comes
below requ. power
SoC
City cycle test L M L M L M L M L M L M L M L M L M L M
Purely electrically driven
Engine start