The Indicator of GDI Engine Operating Mode and Its Influence on Eco-Driving
Round 1
Reviewer 1 Report
1.The structure of the paper is chaotic.
2.There is a problem with the serial number.for example, "3. The indicator","3. The experiment".
3.Lack of scientific explanation for many diagrams.
4.The manuscript lacks novelty
Author Response
Response to Reviewer 1 Comments
Dear Reviewer,
Thank you very much for the peer review and the time you spent preparing it.
1.The structure of the paper is chaotic.
We tried the improve the structure. We add some explanations in the paper, especially the information about the indicator (pages 5 and 6) and discussion of the results (p. 13 and 15).
2.There is a problem with the serial number.for example, "3. The indicator","3. The experiment".
The chapters numbers are corrected.
3.Lack of scientific explanation for many diagrams.
We added some results that weren’t included in the previous version and discussed results (pages 6, 7, 13 and 15). The information about engine speed during tests was added (pages 10-13). The information about the indicator was also included (pages 5-6).
4.The manuscript lacks novelty
We focused on amateur driver behaviour and its possible influence on fuel consumption. The results of our work can be applied in programs for modifying driver behaviour and can be used to develop driver assistance systems.
We hope now the paper is more consistent.
Once again, thank you for all your comments.
Reviewer 2 Report
The paper deals with the effect of the indication of GDI engine operating mode on eco-driving.
The scientific goal of this work is not clearly presented.
Comments
1) Please add y-axis title in the following figures, Figure 1 and Figure 9.
2) Please provide more details regarding the implemented driving cycle and not only the average speed of the vehicle. Add a graph (km/h per gear and driving time) in order to present the driving cycle.
3) Please provide more details regarding engine operating conditions per test (like engine speed and throttle position).
4) Please add more references regarding a) internal combustion engines (handbooks or books), b) automotive electronics (handbooks or technical manuals).
5) Please add a table with all the calculated correlations factors.
In my opinion, the paper in the present form is not suitable for publication in the Journal of Applied Sciences.
Author Response
Response to Reviewer 2 Comments
Dear Reviewer,
Thank you very much for the peer review and the time you spent preparing it.
- Please add y-axis title in the following figures, Figure 1 and Figure 9.
The axis were changed (page 5, 16 and 17)
- Please provide more details regarding the implemented driving cycle and not only the average speed of the vehicle. Add a graph (km/h per gear and driving time) in order to present the driving cycle.
The graphs were added, and an explanation is included (pages 10-13)
- Please provide more details regarding engine operating conditions per test (like engine speed and throttle position).
Some details were added (pages 7, 10-11)
- Please add more references regarding a) internal combustion engines (handbooks or books), b) automotive electronics (handbooks or technical manuals).
Some references were added (page 18)
- Please add a table with all the calculated correlations factors.
The table 1 was added (page 9)
We also add some explanations in the paper, especially the information about the indicator (pages 5 and 6) and discussion of the results (p. 13 and 15).
We hope now the paper is more consistent.
Once again, thank you for all your comments.
Reviewer 3 Report
The purpose of the study was to examine how the information provided by the indicator, which informs about the operational mode of the gasoline direct injection (GDI) engine, can contribute to eco-driving and possible learning of acceleration pedal operation by a driver. The analysis of the fuel injection process affected by driver behavior was an essential part of the experiment. A total of 18 actual vehicle tests were conducted in two parts. The first test (the first nine) was the drive without access to the indicator information. In the second part (the last nine tests), the information on the mode of the engine run was available for the driver. The results confirmed that the information about the type of fuel mixture used for the supply of the GDI engine facilitates an economical driving style (about 10% fuel savings) and helps the driver to eco-driving. The thesis structure is complete and has a particular theoretical and practical significance. However, there are still some problems. The specific problems and suggestions are as follows：
3.Indicator
1) The design picture of the indicator light is missing. It is suggested that the author supplement it for easy understanding
2) It is recommended to distinguish further the fuel consequences caused by the engine operating mode represented by the red and blue indicators
4.Experiment
1) It is suggested that the author show the pictures in the experimental process to enhance the reliability
2) Why is the single experiment divided into morning and afternoon because of the long-distance? Or is it to eliminate the impact of morning and afternoon time on fuel consumption? Explain the reasons for the proposal; Why are the test road conditions different in the morning and afternoon? Will this affect the experimental results? Explain the reasons for the proposal
4) The vehicle stopping time mentioned in the article is caused by road traffic (including the time forced by traffic lights) and a shortstop in the parking lot (point P1 in Figure 2) intended for a passenger change. Why did a passenger change at P1? Was the subject replaced? The suggestion is clearly explained
5) It is suggested to supplement the situation of the subjects. Is it the same person in the morning and afternoon of a single test? Or for different subjects? Or are all 18 tests the same person?
6) The data acquisition during the experiment is significant. It is suggested to supplement the data acquisition process and the data acquisition equipment used (including pictures)
5.Results and discussion
1) When exploring the correlation between vehicle speed and the sum of average adequate fuel injection time on the test route per kilometer, can the use of average speed explain the problem? When the average speed is used, there is no correlation between them. It can represent the sum of the vehicle speed, and the average adequate fuel injection time on the test route per kilometer does not correlate (∑tia,av,k). It is recommended to study further
2) The specific value of the proportion of each part in Figure 7 is not shown in the figure, so it is recommended to mark it in the figure to prepare for the subsequent calculation of the average value of the first nine times and the last nine times
3) The previous study in Figure 8 shows that the stratified, homogeneous, and air only (engine braking) are counted separately. It is suggested to explain why the stratified mixture and air only (engine braking) are combined in Figure 8
4) In the two experiments mentioned in this paper, the average increase of the proportion of stratified mixture refueling in the engine in the test with indicator light is more than 15%. The difference in average fuel consumption between the two parts measured directly is 10.4%. It is suggested to explain the reasons for the difference between the two parts
6 Conclusion
1) It is mentioned in the conclusion that the driver should understand the basic principle of engine operation and the consequences of their behavior. Understanding the chain of action from stepping on the accelerator to fuel consumption and environmental consequences is essential. Whether the subjects are trained before the experiment to make them fully understand all links of the action chain, and it is suggested to supplement this point
2) It is mentioned that it is vital to check the driver's behavior, especially the activities related to stepping on the accelerator pedal. Why is the manipulation of the accelerator pedal not collected? Further clarification is recommended
In short, the structure of this paper is clear. However, the preciseness of the text needs to be further improved, such as chaotic chapter numbers and the varying number of experiments.
Author Response
Response to Reviewer 3 Comments
Dear Reviewer,
Thank you very much for the peer review and the time you spent preparing it.
We add some explanations in the paper, especially the information about the indicator.
3.Indicator
1) The design picture of the indicator light is missing. It is suggested that the author supplement it for easy understanding
The design picture of the indicator is included (page 5).
2) It is recommended to distinguish further the fuel consequences caused by the engine operating mode represented by the red and blue indicators
3.2 We explained the operating mode represented by the red and blue LED lights (pages 3 and 4).
4.Experiment
1) It is suggested that the author show the pictures in the experimental process to enhance the reliability
The pictures of the indicator are included (pages 5 and 6).
2) Why is the single experiment divided into morning and afternoon because of the long-distance? Or is it to eliminate the impact of morning and afternoon time on fuel consumption? Explain the reasons for the proposal; Why are the test road conditions different in the morning and afternoon? Will this affect the experimental results? Explain the reasons for the proposal
We explained why the single experiment was divided into morning and afternoon (pages 6 and 7).
4) The vehicle stopping time mentioned in the article is caused by road traffic (including the time forced by traffic lights) and a shortstop in the parking lot (point P1 in Figure 2) intended for a passenger change. Why did a passenger change at P1? Was the subject replaced? The suggestion is clearly explained
Some information about the test was added (pages 6 and 7).
5) It is suggested to supplement the situation of the subjects. Is it the same person in the morning and afternoon of a single test? Or for different subjects? Or are all 18 tests the same person?
Description of the person was included (page 6).
6) The data acquisition during the experiment is significant. It is suggested to supplement the data acquisition process and the data acquisition equipment used (including pictures)
There is information about the data acquisition system (page 6).
5. Results and discussion
1) When exploring the correlation between vehicle speed and the sum of average adequate fuel injection time on the test route per kilometre, can the use of average speed explain the problem? When the average speed is used, there is no correlation between them. It can represent the sum of the vehicle speed, and the average adequate fuel injection time on the test route per kilometer does not correlate (∑tia,av,k). It is recommended to study further
We added information about the lack of colleration between the vehicle speed and the sum of average adequate fuel injection time on the test route per kilometre. We added some information about colleration between the engine speed and the sum of average adequate fuel injection time on the test route per kilometre (page 13).
2) The specific value of the proportion of each part in Figure 7 is not shown in the figure, so it is recommended to mark it in the figure to prepare for the subsequent calculation of the average value of the first nine times and the last nine times
We add Table 1 with the results (page 9).
3) The previous study in Figure 8 shows that the stratified, homogeneous, and air only (engine braking) are counted separately. It is suggested to explain why the stratified mixture and air only (engine braking) are combined in Figure 8
The information is combined because these two modes of engine run contribute to fuel savings (page 14)
4) In the two experiments mentioned in this paper, the average increase of the proportion of stratified mixture refueling in the engine in the test with indicator light is more than 15%. The difference in average fuel consumption between the two parts measured directly is 10.4%. It is suggested to explain the reasons for the difference between the two parts
The explanation is provided (pages 15 and 16).
6 Conclusion
1) It is mentioned in the conclusion that the driver should understand the basic principle of engine operation and the consequences of their behavior. Understanding the chain of action from stepping on the accelerator to fuel consumption and environmental consequences is essential. Whether the subjects are trained before the experiment to make them fully understand all links of the action chain, and it is suggested to supplement this point
We explained the driver knowledge (page 6).
2) It is mentioned that it is vital to check the driver's behaviour, especially the activities related to stepping on the accelerator pedal. Why is the manipulation of the accelerator pedal not collected? Further clarification is recommended
We explained why the signal from the acceleration pedal wasn’t registered (page 7).
We hope now the paper is more consistent.
Once again, thank you for all your comments.
Reviewer 4 Report
The work is based on two series of road tests repeated nine times, with and without indicator. From the measurements, the authors deduce that the driver, in the presence of the indicator, refines his driving technique and achieves consumption reductions.
However, the authors proceed to their analyzes assuming the two series of measures differ significantly from each other, I guess looking at the consumption values ​​[ms / km], which are slightly different between the two series.
Before proceeding to any analysis it would be more elegant, and more correct, to carry out a statistical test of significance to the two series, in particular the simple t-Student test. If the test did not provide significance, all the work would make no sense.
Therefore, at the beginning of chap. 5, before continuing with the analyzes, I believe it is necessary the authors show the results of the Student's significance test. After that, everything the authors present can remain as it is.
Minor remarks
Row 320: figure 7 instead of 5
Row 386: figure 14 instead of 8
Author Response
Dear Reviewer,
Thank you very much for your review and remarks.
The results of the t-Test are presented in Table 2 (page 9).
The numbers of figures are corrected.
The corrected version of the paper is enclosed.
My Best Regards
Grzegorz Pawlak
Author Response File: 
Author Response.docx
Round 2
Reviewer 1 Report
The literature survey needs improvement, please expand it.
Author Response
Dear Reviewer,
Thank you very much for the second review.
We added 7 literature positions and tried to improve language.
Enclosed please find a corrected manuscript.
Author Response File: Author Response.docx
Reviewer 2 Report
The paper in the revised version meets the requirements for scientific publications.
In my opinion, this work is suitable for publication in the Journal of Applied Sciences
Author Response
Dear Reviewer,
Thank you very much for the second review.
We added 7 literature positions and tried to improve language.
Enclosed please find a corrected manuscript.
Author Response File: Author Response.docx
