EV Range Extender in a Two-Battery HEECS Chopper-Based Powertrain
Round 1
Reviewer 1 Report
Authors study reduction of electric power loss of electric vehicle traction system during some driving modes by introducing a new power train system which has high efficiency chopper circuit between an upper side battery of double battery system and an inverter for motor of the electric vehicle. This paper consists of theory (concept), simulation and experimental results, which is basically well written. I want to request the authors to revise the following point. In the simulation part of 3.3 in page 4, authors write that they calculate the efficiency always using 60Nm in case torque command exceeds 60Nm on line 101 and they find big errors between simulation results and experimental results on line 166 in page 7, which make the proposed system look excellent in the driving cycle including known big errors. Authors should analyze the errors more deeply or expect the right losses, and have to write the existence of errors in the energy loss simulation in ‘4. Conclusion’.
on line 67 in p.3
One EV selected from (6), What is (6)?
Author Response
Our response is summarized in the response paper and all of reviewer's comments are answered and the the revised manuscript is modified. Please look at the response paper.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
The manuscript entitled: “EV Range Extender in use of two battery HEECS chopper based power train” describes a power train based on a two battery High Efficiency Energy Conversion System (HEECS) chopper for EVs. This method, when compared to alternatives, provide better efficiency.
Bibliographical analysis is expected to be more thorough. The authors shall better explain the previous work on their subject and compare it with their contribution. Priority shall be given to recent articles.
Are there any alternative solutions able to deliver similar efficiency improvements?
Which are the theoretical considerations that allow the increased efficiency of the proposed configuration? How is it analytically calculated? Please elaborate.
The authors use the term “freedom of optimization”. How is this achieved for different applications? Are there any more specific cases that this principle is applied?
“KANA” is vehicle on which the system is case tested. On which degree this vehicle corresponds to a real system? Please clarify.
Equation (3) provides the chopper output voltage based on vehicle speed. How this has been decided and why is it the better solution? Could it be improved?
Minor additional comments have as follows:
- Figures are usually not printed at the introduction.
- Minor language improvements could enhance manuscripts readability.
- Data on figures 6-8 are well known to the potential audience and hence could be reduced or omitted.
- The authors could provide as open access supplementary material their source code and data. This will enhance their manuscript’s replicability and will facilitate other researchers who wish to build upon its findings.
Having mentioned the above, this manuscript is proposed to be published after major revision. Special attention shall be given in improving the theoretical background of this analysis.
Author Response
Our response is summarized in the response paper and all of reviewer's comments are answered and the the revised manuscript is modified. Please look at the response paper.
Author Response File: Author Response.pdf
Round 2
Reviewer 2 Report
Authors have adequately covered reviewer’s comments, henceforth, this manuscript is proposed to be published.
Minor language improvements are still required.
