The WLTP E-Lab subgroup decided to change its name as part of the shift in focus from the initial WLTP GTR to the new “phase 1b” and future phases in the development of the regulation. Consequently, this session can be considered as the 6th session of the E-Lab group and/or as the 4th session of the Electric Vehicles subgroup.
The proposal of shortened test procedure for PEV from JP was based on SAE J1634 standard. JP also submitted validation results for the test procedure during phase 1a. ACEA provided comments on the proposal.
In the constant speed cycle from SAE, another speed with justification is welcome. How to define the constant speed. ACEA propose that this should be decided by the manufacturer. The influence of the loss by battery internal resistances on the variation of results when higher speeds are used should be checked. There was a request from ACEA for additional tests with different constant speeds, in order to see what effect this will give. JP will bring the question to JP experts and ask if it is the possible to check SOC of the high voltage battery before segment 2 in the test cycle.
From the perspective of safety in approval test, the usage of on-board data is preferable. Measuring high voltage could be a dangerous task. The question when we use on-board data is if on-board voltage data is reliable. There is a need to check if on-board data is correct comparing with the data from a measurement with external measurement equipment.
Another option is to develop a test procedure to measure high voltage or a shortened test procedure that does not require voltage data. For a coming meeting industry will present a proposal on how this will be done.
Issues for further discussions are following:
1. Determination of specific rules for manufactures’ instructions.
2. Confirmation of adaptability and accuracy of on-board data for the type approval.
There is a need for validation on the correlation between procedure according to GTR and the proposed shortened test procedure. JP has already conducted part of this and the results are submitted. The results will be shown later. JP will check the number of repetitions they did conduct.
There is a need for additional validation tests. EC can accept to introduce the procedure if it is up to CP needs. JP will check if this can be accepted as a way forward. Otherwise there will be necessary with more validation data.
There was a question regarding the reason why additional L and M phase in the test cycle for shortened procedure is necessary. JP answered that the extra L and M are only to make balanced distance between cycles.
ACEA will consider to conduct validation test to see if WLTPcity is also applicable when shorten test is adopted.