Real-world measurement and mechanical-analysis-based verification of NOx and CO2 emissions from an in-use heavy-duty vehicle

Hata, Hiroo; Kokuryo, Kazuo; Ogata, Takehiko; Kugata, Masahiko; Yanai, Koichi; Okada, Megumi; Funakubo, Chikage; Yamazaki, Minoru; Hoshi, Junya

doi:https://doi.org/10.5194/amt-14-2115-2021

Articles | Volume 14, issue 3

https://doi.org/10.5194/amt-14-2115-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/amt-14-2115-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 14, issue 3

Research article

|

16 Mar 2021

Research article |

| 16 Mar 2021

Real-world measurement and mechanical-analysis-based verification of NO_x and CO₂ emissions from an in-use heavy-duty vehicle

Hiroo Hata, Kazuo Kokuryo, Takehiko Ogata, Masahiko Kugata, Koichi Yanai, Megumi Okada, Chikage Funakubo, Minoru Yamazaki, and Junya Hoshi

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Final revised paper (published on 16 Mar 2021)
Supplement to the final revised paper
Preprint (discussion started on 07 Sep 2020)
Supplement to the preprint

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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- Supplement

RC1: 'Major revisions required', Justin Bishop, 22 Nov 2020
- AC1: 'Answer for referee1', Hiroo Hata, 04 Dec 2020
RC2: 'amt-2020-286-Review-2020-12-06', Nikiforos Zacharof, 06 Dec 2020
- AC3: 'Reply on RC2', Hiroo Hata, 29 Dec 2020
AC2: 'Reply on RC1 (after revising with RC2's suggestions)', Hiroo Hata, 29 Dec 2020

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

AR by Hiroo Hata on behalf of the Authors (06 Jan 2021) Author's response Manuscript

ED: Referee Nomination & Report Request started (07 Jan 2021) by Anna Novelli

RR by Anonymous Referee #2 (25 Jan 2021)

Suggestions for revision or reasons for rejection

The paper needs some minor corrections in terms of language and technical terms. Please go through the document and elaborate the text. Other than that it was good to see that various issues have been addressed. The paper describes in detail the experimental process and highlights several issues that could be useful in the field of heavy-duty vehicle testing. This especially useful as various regions in the world are setting respective emission targets. One important aspect of the study is the divergence of the driving profile from the WHVC, which could be a basis for future research.

There is a series of mostly minor issues to be corrected:

Line 16: “The constructed tables well replicated…”, please elaborate sentence to “The constructed tables replicated well…”
Line 23 – 25: “Global warming… (Saito, 2010).” This sentence is quite long and a bit difficult to follow. Please elaborate and consider splitting it into two.
Line 25: “photochemical oxidant”, please consider using the term in plural or as “photochemical oxidant compounds”.
Line 88: “two times” consider replacing it with “twice”.
Line 94: “The vehicle acceleration (km/s2) was…”, please check the units, there seems to be a mistake. I would expect to see m/s2.
Line 142: Please correct the term “inside the engine room” with a more suitable term such as “combustion chamber”, otherwise it conveys the wrong message. Apply this to all other relative cases.
Line 176: “the engine is cooled”, it is not clear whether the engine is cold or it is cooled down explicitly for the purposes of the experiment. Same applies in line 178 “vehicle body is also cooled”.
Line 203: “detoxification system” is an uncommon term and it could be a bit misleading. Please change to after-treatment systems.

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ED: Publish subject to technical corrections (03 Feb 2021) by Anna Novelli

AR by Hiroo Hata on behalf of the Authors (08 Feb 2021) Author's response Manuscript

Post-review adjustments

AA: Author's adjustment | EA: Editor approval

AA by Hiroo Hata on behalf of the Authors (15 Mar 2021) Author's adjustment Manuscript

EA: Adjustments approved (15 Mar 2021) by Anna Novelli

Short summary

The authors conducted the measurement of real-world CO₂ and NO_x emissions from one heavy-duty vehicle. The results showed that NO_x emissions increased in colder seasons because of the deactivation of after-treatment tools. We proposed an estimation model of vehicle emissions based on the classical mechanic theory. The model explained the emission behavior of CO₂ and NO_x well, and thus, we concluded that the proposed model will be applied to the evaluation of vehicular emission inventories.