Comparison of Three Methods for Constructing Real Driving Cycles
Round 1
Reviewer 1 Report
Pg. 2 Line 57: Define the names of the cycles for FTP 75, UDDS, NEDC, WLTC. Does UDDS refer to the light duty or heavy duty UDDS cycle or both?
In Table 1: Define the meanings of B-F, F, E, C-B designations for LoS.
Table 2 Appears to be missing from the manuscript.
Pg. 5 Lines161-162: The buses monitored in the study wer older technology buses which did not have Diesel Particulate Filters, Diesel Oxidation Catalysts or SCR systems. Buses with these systems often incorporated thermal management strategies to maintain adequate aftertreatment system temperatures. These thermal management systems can increase fuel use particularly in cool or cold climates. The results obtained in this study may not translate well to buses which incorporate aftertreatment systems. The Fuel-Based method may pe particularly affected by the presence of aftertreatment systems.
Pg. 5 Line 176: "developed an algorithm"
Pg. 6 Line 186-190: Calibration procedures are described. NDIR analyzers for CO and CO2 are susceptible to interference from water vapor and other gases in the exhaust. For example CO2 interferes with measurement of CO and vice versa. This occurs because CO, CO2 and water vapor absorb similar wavelenghts of light. Were interference checks performed on the instrumentation?
Pg 6 Line 218: Delete duplicate work "in"
Pg. 9 Line 309: "zero to infinity"
Pg. 14 line 383: "and those observed in"
Pg. 14 Line 389: "major sources of the differences"
Multiple places in paper: "change that exhibit the vehicles" to "exhibited by the vehicle"
Author Response
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Author Response File: 
Author Response.docx
Reviewer 2 Report
Dear Authors,
- It would be good to explain more in details the methods used to construct the DCs. To that end, I would restructure the introduction and place L91-L110 in the methodology section, as it is crucial information on the methodology applied. For the Fuel based method, the method to construct the DC is never explained, apart that it is 'based on fuel consumption'.
- Figure 2 is a little bit confusing. Seems like you are using the CPs to construct the cycles and then veryfying them by the same CPs, which is of course a cycle reasoning and self forfilling
- L201 'from time to time' sounds very arbitrary. Considere using different wording.
-L205-L211. Consider shortening this expenation. the details of the syncing process are not relevant
- Formula 1 RDi: This is a nsommation of an absolute value I assume? Otherwise negative and positive deviations will cancel each other out in the sommation.
-L309: cero, should be zero
-Was the bus payload taken into account? This is an important factor in the fuel consumption and if not taken into account can influence the fuel based method or accuracy of MT and MCMC methods for fuel consumption representation.
Author Response
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Author Response File: Author Response.docx
