1. Problem with Rcda and suggestions for them
From WLTP EV SG
For
Meeting at EU representation
11 am on 9th June (2015)

2. The current GTR definition of Rcda
Rcda: "Charge-depleting actual range" means the distance travelled in a series of WLTCs in charge-depleting operation condition until the rechargeable electric energy storage system (REESS) is depleted.
100
charge-depleting 80 60
SOC (%) 40
charge-sustaining 20
Rcda
The distance of a trip
With this Rcda, the things in the next page could happen.

3. Complexity of what Rcda indicates
AER type
BLENDED type
Vehicle +
Rcda
Rcda
AER type vehicle could be converted into BLENDED type by changing its control strategy without changing its hardware. As the consequent, Rcda could be extended easily.

4. Decision on Rcda in high levels EV SG leader’s suggestion
Problem with Rcda(for cycle and phase)
What Rcda indicates is too complex to users.
⇒ This is a common problem between cycle and each phase. 　
Suggestion for the development of test procedure of Rcda in phase 1b
Decision on Rcda in high levels
EV SG leader’s suggestion
Case 1) to maintain Rcda
to postpone the development to phase 2
We already have a solution deal with Rcda, especially for the interpolation approach. Thus, we could complete the development during phase 1b. On the other hand, reflecting the solution to the gtr will be hard work because of the complexity.
Case 2) to withdraw Rcda
to cancel the development
We should focus on the other issues to be completed in phase 1b. (REMINDER: EAER could be the alternative of Rcda.)
Case 3) to suspend Rcda
In this case, the priority of Rcda becomes lower than other remaining issue. Thus, we should focus on the other issues during phase 1b.

5. EAER: precise indicator of electric range AER type BLENDED type
Appendix
EAER: precise indicator of electric range
AER type
BLENDED type
Vehicle L
Vehicle H +
EAER
EAER +
same Wh
more fuel
same Wh
more fuel
EAER
EAER
EAER can represent the influence of increase of energy demand on results more precisely than Rcda.

6. Comparison between Rcda and EAER on the interpolation approach
Appendix
Comparison between Rcda and EAER on the interpolation approach
Vehicle L was driven with no engine-on in CD
Vehicle H was driven with engine-on in CD
The linearity of interpolation line for Rcda is insufficient in case that the additional family criteria is not included.
Vehicle L
Vehicle H
Under the same condition, the linearity of interpolation line for EAER is sufficient.
(Reference : WLTP-SG-EV rev1)