Abstract
Medium-duty (MD) and heavy-duty (HD) natural gas (NG) vehicles have benefited from significant recent growth in NG production, with relatively low and stable NG prices. Growing compressed NG and liquefied NG refueling capability and growing interest in renewable NG pathways align with increasing MD/HD NG engine options and vehicle availability to further strengthen the market. Additionally, growing interest by the California Air Resources Board and U.S. Environmental Protection Agency in potential regulations requiringultra-low levels of oxides of nitrogen (NOx) emissions may encourage MD/HD NG vehicle adoption since NG engine and aftertreatment technology may help meet those ultra-low NOx levels more cost-effectively than diesel. However, current MD/HD NG engine technology, with stoichiometric spark ignition (SI), exhaust gas recirculation (EGR), and three-way catalyst aftertreatment, is less efficient than current diesel technology.
Original language | American English |
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Number of pages | 11 |
State | Published - 2020 |
Bibliographical note
See the Vehicle Technologies Office Advanced Engine and Fuel Technologies 2019 Annual Progress Report at https://www.energy.gov/sites/prod/files/2020/06/f75/VTO_2019_APR_ADV_FUEL_COMPILED_REPORT_compliant%20052020_0.pdfNREL Publication Number
- NREL/MP-5400-78759
Keywords
- engine studies
- natural gas (NG) vehicles