EPA is currently beginning development of a new mobile source emissions model that will replace MOBILE6. As part of that development, modules are being written to calculate emission factors from typical driving traces of different kinds of vehicles under different operating conditions. For this work assignment, EPA has asked ERG to use existing heavy-duty vehicle activity data to develop representative speed versus time driving cycles for heavy-duty vehicles. Once these driving cycles are developed, they can be incorporated into the code of the new mobile source model where they can be used by simulation programs to estimate the emissions of vehicles as they might be produced by heavy-duty vehicles actually driving the particular schedules. In this study, the authors construct cycles from so called micro-trips in an effort to match the speed, acceleration, and vehicle specific power characteristics of the non-idle driving portions of the dataset. These three particular activity variables are chosen for matching purposes because they largely influence the emissions behavior of a given vehicle. The effects of vehicle weight and road grade are not included in developing these cycles even though they are known to have important effects on emissions because those parameters were not available in the existing dataset. Accordingly, the cycles developed in this study should be regarded as a temporary solution to describing heavy-duty vehicle driving behavior. When data becomes available that has vehicles weights and road grade in addition to speed, acceleration, and vehicle specific power on a second-by-second basis, then improved driving schedules can be developed.
Roadway-Specific Driving Schedules for Heavy-Duty Vehicles
2003
48 pages
Report
Keine Angabe
Englisch
Transportation , Environmental Pollution & Control , Environmental Management & Planning , Combustion & Ignition , Engine Studies, Energy Related , Roadway analysis , Specific Driving Schedules , Heavy-duty vehicles , Mobile source emission , Speed , Driving behavior , Acceleration , Vehicle specific power characteristics
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