№ lp_1_40627
Actions, outcomes, remaining open issuesOICA to consider the statistical methods for the next EVE IWG discussion. Break out group suggested on Annex 3 of the GTR, statistical method Part A for option B, and also on family definitions. Break out group to identify and capture all relevant durability factors to Part B families. U.S. EPA to follow up on methods for checking software versions UNECE secretariat to also follow up on application of software versions in the context of GTR in WP. 29Open issues, GTR additionsAdded placement of battery in vehicle in section 6.1.2.EVE IWG to improve GTR text regarding chargers in section 6.1.2 on the Part B family groups (e.g. dc charging capability). Rounding issue remains an open issue to be confirmed by the EVE IWG Mention of VG2 grid added in GTRSentence 6.4.1 modified to on minimum threshold for statistical approach.
Location: WebEx
Date and Time: April 23, 2021 at 05:30 – 08:00 EST April 26, 2021 at 05:30 -08:00 EST
Chair: Mr. Michael Olechiw (USA) [Present]
Vice-Chair(s): Mr. Hajime Ishii (Japan) [Present] Ms. Chen Chunmei (China) [Not Present]
Secretary: Ms. Kendelle Anstey (Canada) [Present]
Drafting Coordinator(s): Ms. Panagiota Dilara (European Commission) [Present]
Note: Agenda Items
CoP: Conformity of Production
DPR: Declared performance requirement
EC: European Commission
EVE IWG: Electric Vehicles and the Environment Informal Working Group
ISC: In-service conformity
MPR: Minimum performance requirement
SOC: State of charge
SOCE: State of Certified Energy
SOH: State of Health (previous term SOH used, but now refers to both SOCE and SOCR)
SOCR: State of Certified Range
U.S. EPA: United States Environmental Protection Agency
SAE: Society of automotive engineering
OICA provided document EVE-46-09e which analyzed proposed statistical methods for Part A using the Monte Carlo simulation method, and a normal distribution to fit the behavior of the methods.: A1:Use of decisions chart for the statistical procedure (following ISC procedure)A2:Use of table from UN Regulation No. 83 (following CoP procedure)Option B:calculated normalized valuesOICA noted that option B is very sensitive to range estimate. If it is slightly overestimated the test will fail. The ratio needs to be below one to have a high pass rate. With this in mind, OICA considers Option A1 and A2 to behave more logically, even if Option B has a similar distribution. Japan noted that the difference between the A and B options is the % criteria between the measured and read SOCE.EC recommended to adjust the parameters and to repeat the methods. Japan agrees.OICA commented that if unable to change parameters for option B by June then Option A should be chosen.OICA considers option B unfeasible for evaluating standard deviation (see slides in document EVE-46-09e)
U.S. EPA presented document EVE-46-12e. Main ideas and proposals expressed were the following: Recommendation of a functional analysis of part B family criteria that relates to vehicle design features to battery durability.Suggested formation of a technical subgroup to identify and capture all relevant durability factors.Examples provided of battery durability aspects that could be considered for Part B families. Recommendation was made by the U.S. EPA to consider a virtual mileage to consider the factors that may lead to battery degradation that the odometer doesn’t already take into account. Such examples:Storage over battery calendar lifeV2G and V2home chargingU.S. EPA also recommended to consider a variation allowance for part b families. Consideration of battery swapping was also mentioned as a point of consideration. EVE IWG feedbackOICA – does not want a significant number of vehicles excluded from the monitors. OICA will have a discussion on virtual mileage to cover extended usage. Not many positions on battery swapping from EVE IWG members, but many could see it as an issue. EC in agreement that V2G is considered normal usage. OICA – on idea of equivalent mileage could also include autonomous driving impacts. AVERE interested to take part in any sub group or break out group interested in tackling this issue.
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