Transcript EVSTF-06-32ex

EVSTF-06-32e
GTR-EVS
TF-6 SOC – OICA Discussion Paper
Jan 21st, 2016
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Reference – Status at 9th Session
(see EVS-09-21)
6.2.1.2. Procedures for SOC adjustment
6.2.1.2.1. The adjustment of SOC shall be conducted at an ambient temperature of 20 ± 10 °C for vehicle-based tests [and 22 ±
5°C for component-based tests.]
6.2.1.2.2. The SOC of the tested-device shall be adjusted according to one of the following procedures as applicable. Where
different charging procedures are possible, the REESS shall be charged using the procedure which yields the highest SOC.
(a)
For a vehicle with a REESS designed to be externally charged, the REESS shall be charged to the highest SOC in
accordance with the procedure specified by the manufacturer for normal use until the charging process is normally
terminated.
(b)
For a vehicle with a REESS designed to be charged only by an energy source on the vehicle, the REESS shall be
charged to the highest SOC which is achievable with normal operation of the vehicle. The manufacturer shall
advise on the vehicle operation mode to achieve this SOC.
(c)
In case that the REESS or REESS sub-system is used as the tested-device, the tested-device shall be charged to the
highest SOC in accordance with the procedure specified by the manufacturer for normal use until the charging
process is normally terminated. Procedures specified by the manufacturer for manufacturing, service or
maintenance may be considered as appropriate if they achieve an equivalent SOC as for normal use. In case the
tested-device does not control SOC by itself, the SOC shall be charged to not less than [95 %] of the maximum
normal operating SOC defined by the manufacturer for the specific configuration of the tested-device.
6.2.1.2.3. After the adjustment of the SOC according to paragraphs 6.2.1.2.1. and 6.2.1.2.2. above, the test shall be started within
48 hours subject to taking all reasonable and practical steps to ensure the initial SOC (i.e. the SOC achieved at the end of
the adjustment according to the paragraphs 6.2.1.2.1. and 6.2.1.2.2. above) is maintained, otherwise an appropriate
verification shall be made to confirm that the SOC is maintained not less than 90 % of the initial SOC e.g. by checking the
voltage-drop and using the OCV-SOC curve of the REESS , etc.
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NHTSA Proposal – Oct 10th, 2015
6.2.1.2.3.
After the adjustment of the SOC according to
paragraphs 6.2.1.2.1. and 6.2.1.2.2. above, the test shall be started within
48 hours subject to taking all reasonable and practical steps to ensure the
initial SOC (i.e. the SOC achieved at the end of the adjustment according
to the paragraphs 6.2.1.2.1. and 6.2.1.2.2. above) is maintained, otherwise
an appropriate verification shall be made to confirm that the SOC is
maintained not less than 90 % of the initial SOC e.g. by checking the
voltage-drop and using the OCV-SOC curve of the REESS, etc.
NHTSA Proposal
6.2.1.2.3
When the vehicle or REESS subsystem is tested, the SOC
shall be no less than 95 % of the SOC according to paragraphs 6.2.1.2.1.
and 6.2.1.2.2. for REESS designed to be externally charged and shall be
no less than 90 % of SOC according to paragraphs 6.2.1.2.1. and 6.2.1.2.2.
for REESS designed to be charged only by an energy source on the
vehicle.
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JRC Comment – Nov 30th, 2015
48 h elapsed time before tests:
“ We note that the TF6 proposal justification does not provide a basis for
specifying the time within which a test is to be performed following adjustment
of the SOC i.e. 48 hours. Such a justification needs to be provided
demonstrating that SOC can not drop below the required level within 48 hours,
otherwise the text proposed by the US may be appropriate and sufficient
considering:
– The observation from testing bodies of "the relative simplicity in attaining and
maintaining SOC at 95% of the maximum SOC under normal use as specified by
the manufacturer for electric vehicles (EVs) and plug in hybrid electric vehicles
(PHEVs) by charging the vehicle just prior to testing"
– The technical feasibility of verifying that SOC is achieved and maintained, as
already foreseen in the TF6 proposal Procedure.
“
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Japan Comments – Dec 9th, 2015
JAPAN comments on the proposal of NHTSA
•
•
•
•
•
TF6 provided the procedure to achieve “High SOC” which can reasonably be achieved for the
preparation of the tests and has been discussing the way to confirm SOC condition would be
maintained at a sufficient level until execution of the test.
As NHTSA understands, the SOC may not be determined by simple measurement of open
circuit voltage and the only way to accurately determine the SOC is to measure the current
during discharging and recharging.
For this reason, only SOC value that can be checked before conducting the test is the
estimated value according to the manufacturer’s specific knowledge.
TF6 proposed 48 hours period as an alternative for the practical solution for the difficult case
which guarantees that SOC fulfills the required test conditions.
For example, in case of vehicle crash tests or fire resistance test, SOC adjustment may be
carried out at a different location from where these tests are conducted.
The provision to conducting the test within a reasonably short period after SOC adjustment
subject to reasonable and practical steps to minimize the capacity loss will be a remedy for
such situations.
NHTSA also applies the practical procedures to confirm the voltage of REESS at the tests
according to FMVSS 305.
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Comparison of Proposals
Nominal
SOC
TF-Proposal: test within 48h OR re-confirm SOC
~100%
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-5%
Externally
chargable
REESS
Non-externally
chargable
REESS
OICA Discussion Paper for TF-Mtg
NHTSA Proposal
TF-Proposal if after 48h
To highest SOC possible
NHTSA Proposal
-10%
TF-Proposal if after 48h
Until termination or min. 95%
-10%
After initial
charging
At start of test
If test conducted
>48h after charging
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Discussion
• Be aware that section describes the procedure to achieve a SOC
condition, rather than the status itself at the start of the test.
• Expected that proposals from TF-group and NHTSA lead to no or
minimal differences in effective SOC.
• Omitting the 48h period would leave the time between SOC
adjustment and actual test start open:
– In most cases it would fall under responsibility of manufacturer.
– In other cases under responsibility of technical service or
– Authority.
• It is commonly understood that the test should take place „as soon
as possible“ or „immediately“ after last charging, but how long is
„as soon as possible“ or „immediately“ allowed to be?
• „48h“ so far is TF‘s and OICA‘s interpretation of a practical period
after which the test is to be started.
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Relationsship between OCV and SOC
Typical nominal applied operating range
OCV not always suitable indicator to determine SOC.
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SOC Effect onto Energy Release
Relationship between SOC and Heating Rate non-linear but not exponential;
Amount of heat linearly correlating to SOC
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