Reducing Fuel Consumption and Greenhouse Gas Emissions of Medium- and Heavy-Duty Vehicles, Phase Two Final Report (2020) / Chapter Skim
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Appendix D: Summary of Analysis of Engine and Vehicle Combinations
Appendix D: Summary of Analysis of Engine and Vehicle Combinations
Pages 356-359
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From page 356... ...
A National Research Council committee is looking at technologies that could become available beyond the Phase II time frame, so a project was created to use the models developed in the NHTSA project to explore technology potential farther into the future. Four vehicle types were evaluated to cover the range of Class 2b through Class 8.
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From page 357... ...
RESULTS: The stoichiometric SI natural gas engines have by far the lowest thermal efficiency of all the engine options, but they still provide a 10 to 20 percent reduction in CO2 emissions compared to the 2019 diesel baseline. This CO2 reduction needs to be treated carefully, because the greenhouse gas advantage from reduced CO2 can easily be overwhelmed by tailpipe methane emissions and any leakage of natural gas fuel.
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From page 358... ...
FIGURE D-1 (a) Baseline 2019 diesel plus down-speed and reduced friction mean effective pressure engine, from NHTSA project; (b)
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From page 359... ...
APPENDIX D 359 (c) FIGURE D-1 Continued
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