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WLTP: Testing Burden and Accuracy of RCB correction
Document WLTP-SG-EV-06-14
8 December 2014
Submitted by Japan
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Previous Documents, Discussions, and Outcomes
2. | OIL #50: RCB correction

- Re-opening of the OI after request from ACEA EV group. Christoph Lueginger introduced the ACEA document on behalf of Nico Schütze (member of the ACEA WLTP EV group) and the ACEA WLTP EV group. Main issue for phase specific values.
- Current procedure for CS test.
- Separate correction coefficient for each phase not working properly.
- Cycle correction coefficient gives smaller error.

One issue that cycle energy does not take into consideration the effect from cold start only the effect from RLD. Last slide summaries the proposal.

According to Japan there are two new concepts, use for CO 2 family and a warm start test to determine correction. This is an important step to reduced test burden.

Japan shows test data (WLTP-SG-EV-06-14). Time consuming to determine data from test. Changing unit to Ah/km gives the same slope, almost.

ACEA proposal will improve the procedure.

India thinks the approach could be used.

European Commission (EC) and Japan need to scrutinize the proposal to confirm at the next WLTP IWG meeting.

Sub Group EV needs to prepare short introduction for next WLTP IWG meeting.

Conclusion:
ACEA proposed a new proposal to obtain RCB correction coefficient of CS with warm condition and this is applicable for vehicles in the same family.

JPN will bring this proposal and response until #9 meeting. Then, this issue could be closed in #9 meeting, after the JPN’s response.

Relates to Electric Vehicles & the Environment | GTR No. 15 |