A Review of Drive Cycles for Electrochemical Propulsion
, Dan J. L. Brett 1,2,3 and James B. Robinson 1,2,3,*Round 1
Reviewer 1 Report
1. Check the order of the citations, because on page 2 you go from citation 9 (line 80) to citation 11 (line 83)
2. The resolution quality of the lines of text in Figure 6.c should be improved
3. In figure 10 the lines of text are very small, it is not possible to read the text.
4. References 8 and 11 are very old, consider replacing them with more current references.
One suggestion to the authors is that they delve a little deeper into the comparison of the methodology they propose in their study with respect to other methodologies that have already been previously reported in this field of knowledge. I consider this to be a very interesting investigation and it has my approval to be accepted.
Author Response
We'd like to thank the reviewer for their constructive remarks and positive feedback on the article. A detailed response to the points raised are shown below:
- Check the order of the citations, because on page 2 you go from citation 9 (line 80) to citation 11 (line 83)
Response: A sentence about gas guzzler tax was deleted by accident, which required citation 10, it is now added.
2. The resolution quality of the lines of text in Figure 6.c should be improved
Response: Picture re-constructed with higher resolution.
3. In figure 10 the lines of text are very small, it is not possible to read the text.
Response: The smaller text pictures are maximized in further diagrams of the paper. However, it does make sense that all text should be visible. The best course of action is to delete the small-text mini diagrams and rely on the further figures to clarify the architectures.
4. References 8 and 11 are very old, consider replacing them with more current references.
Response: Reference 11 is replaced with a newer paper. However, the topic of reference 8 is very historical so the authors couldn't find any newer sources that covers the subject.
One suggestion to the authors is that they delve a little deeper into the comparison of the methodology they propose in their study with respect to other methodologies that have already been previously reported in this field of knowledge. I consider this to be a very interesting investigation and it has my approval to be accepted.
Response: Thanks for the suggestion this is something we will look to do in a future research paper due to the complexity of this topic. This document is a precursor to future research where we feel will be well suited to a qualitative comparison and we thank the reviewer for this suggestion which we will certainly include.
Reviewer 2 Report
Electrification in transport requires clarification of the operating conditions of EV, HEV. An obvious and necessary step is to find a solution to the problem of creating a special driving cycle for vehicles using chemical-to-electrical energy converters.
The review article under review makes it possible to identify the main shortcomings of the current driving cycles.
The article meets the requirements of the review material. There are obvious ways to improve the manuscript. According to the reviewer:
1. Marine and aviation cycles should be supplemented with railway ones. It is well known that the power plant of a diesel locomotive (still relevant in transport) is like a kind of hybrid drive.
2. In addition to the tension of traffic, which the authors directly or indirectly remind the reader of, one should pay attention to the profile of the road. For example, as presented in DOI: 10.15282/ijame.19.2.2022.08.0750
3. The selected energy recovery conditions are of great importance for the speed profile. This aspect should be taken into account when choosing a driving cycle for EV, HEV.
Author Response
We would like to thank the reviewer for taking the time to offer constructive opinions on how to improve the article and for their positive feedback. We have considered the points noted by the reviewer and included a detailed response below:
- Marine and aviation cycles should be supplemented with railway ones. It is well known that the power plant of a diesel locomotive (still relevant in transport) is like a kind of hybrid drive.
Response: Railway is an interesting application which has a relatively facile duty cycle with long periods of steady power, and comparatively short acceleration and deceleration phases. In some senses this is similar to the aviation use case described with a reduced magnitude on the acceleration phase and the opportunity for energy recovery during deceleration. As a result of this profile It is highly likely that this could be achieved using a standard fuel cell system architecture with quite a small battery and therefore we considered it out of scope for this review. We have however added the above description to the document following the aviation section as the reviewers’ perspective is likely to be mirrored by other readers.
2. In addition to the tension of traffic, which the authors directly or indirectly remind the reader of, one should pay attention to the profile of the road. For example, as presented in DOI: 10.15282/ijame.19.2.2022.08.0750
Response: This is a good suggestion. Estimating gradient is definitely important for accurate calculation of power profiles. The suggested paper was mentioned and reference, along with another paper.
3. The selected energy recovery conditions are of great importance for the speed profile. This aspect should be taken into account when choosing a driving cycle for EV, HEV.
Added explanation to emphasise using negative required power for regenerative braking: 'Any negative region of the power cycle is a potential for regenerative braking, though the ‘negative required power’ can never be recovered in full, as losses always occur during regen.’
