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Medium- and heavy-duty trucks, motor coaches, and transit buses - collectively MHDVs - are used in every sector of the economy. The fuel consumption and greenhouse gas emissions of MHDVs have become a focus of legislative and regulatory action in the past few years. This report comprises the first periodic, five-year follow-on to the 2010 report, Technologies and Approaches to Reducing the Fuel Consumption of Medium-and Heavy-Duty Vehicles. It reviews NHTSA fuel consumption regulations and considers the technological, market and regulatory factors that may be of relevance to a revised and updated regulatory regime taking effect for model years 2019-2022.
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Medium- and heavy-duty trucks, motor coaches, and transit buses - collectively, "medium- and heavy-duty vehicles", or MHDVs - are used in every sector of the economy. The fuel consumption and greenhouse gas emissions of MHDVs have become a focus of legislative and regulatory action in the past few y...
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Description
The committee will prepare a report as follows 19 months after the start of the cooperative agreement (April 2014):
- The committee will review the NHTSA fuel consumption regulations promulgated on September 2011 (76 Federal Register 57106) and consider the technological, market and regulatory factors that may be of relevance to a revised and updated regulatory regime taking effect for model years 2019-2022. This review will include, but not be limited to, the potential for technological change in commercial vehicles in MY 2019-2022 and the impact it might have on the regulatory regime. Also as part of its review, the committee will explore regulatory options for trailers.
- The committee will analyze and provide options for improvements to the certification and compliance procedures for medium- and heavy-duty vehicles - including the use of representative test cycles and simulation using various models - such as might be implemented in revised fuel consumption regulations affecting MY 2019-2022.
- The committee will review an updated analysis of the makeup and characterization of the medium- and heavy-duty truck fleet, including combination tractors, trailers, busses and vocational vehicles. The committee also will review the methodology for providing on-road information on fuel consumption.
- The committee will examine the barriers to and the potential applications of natural gas in class 2b through class 8 vehicles. The committee will consider how such vehicles could be included in the framework on fuel consumption regulations.
- Address uncertainties and perform sensitivity analyses for the fuel consumption and cost/benefit estimates, to the extent possible, and provide guidance to NHTSA on improving its uncertainty analyses given the relatively long time frame for these future estimates.
Further, with respect to a final report (May 2016), the committee will:
- Review and contrast the final rule for fuel efficiency/greenhouse gas emissions standards for medium- and heavy-duty engines and vehicles for model years 2014-2018 with the recommendations offered in the NRC 2010 report. The committee will identify the potential implications and gaps in the U.S. regulatory process for medium- and heavy-duty vehicles as they pertain to the engine manufacturers, trailer manufacturers, final stage manufacturers, and complete vehicles. As part of this activity, the committee will explore regulatory options for trailers from a total vehicle perspective. The committee will contrast the U.S. regulatory approach to that in other parts of the world, notably Europe, Japan, China and India.
- Analyze and provide options for improvements to the certification and compliance procedures for medium- and heavy-duty vehicles, including the use of representative test cycles and simulation using EPA's Greenhouse Gas Emissions (GEM) model.
- Review updated baseline information on the medium- and heavy-duty truck fleet, including combination tractors and trailers. The committee also will review the methodology for providing on-road information on fuel consumption necessary to inform baseline standards.
- Examine advanced gasoline engine technologies, including the ability of those engines to meet load demands, the impact of those engines on cost, the need for after-treatment systems, and their market acceptability. The committee will also consider the impacts of possible alternate fuels on these technologies.
- Examine diesel vehicle technologies, including the capabilities of emissions control systems to meet current and possible future criteria pollutant emissions standards, the impacts on fuel consumption attributed to meeting emissions standards, and the fuel characteristics needed to enable low emissions diesel technologies. The committee will also consider the impacts of possible alternate fuels on these technologies.
- Examine electric power train technologies, including the capabilities, limitations and cost of hybrids, plug-in hybrids, battery electric vehicles, and fuel cell vehicles. Specific areas of interest include electric vs. hydraulic vs. other; all electric vehicles; start/stop systems; implementation strategies; total capital and operating costs; modeling and simulations as a tool; the certification process; and emissions compliance.
- Examine battery technologies including an examination of the cost, performance, range, durability (including performance degradation over time) and safety issues related to lithium ion and other possible advanced energy storage technologies that are necessary to enable plug-in and full function electric vehicles.
- Examine the potential for reducing vehicle mass including technologies such as materials substitution, and the use of new vehicle, structural, system or component designs. Examine other vehicle technologies, including aerodynamic drag reduction, improved efficiency of accessories such as alternators, and the conversion of engine-driven equipment to electricity (e.g., HVAC, fans, and water pumps).
- Evaluate intermodal and intelligent systems for potential fuel consumption benefits, including a survey of the current fleet communication systems (vehicle-to-vehicle, vehicle to infrastructure), existing barriers to implementation, and future technologies.
- Review the potential impacts of fuel-consumption-reduction technologies on medium- and heavy-duty vehicle safety including aerodynamic components, wide-based wheels and tires, tire pressure monitoring/automatic inflation systems, hybridization/alternative fuels, combination vehicles/higher GVWRs, light-weighting, and idle reduction/stop-start, and others.
- Provide an analysis of how fuel efficient technologies may be practically integrated into manufacturing processes and how such technologies are likely to be applied in response to requirements for reducing fuel consumption. The committee will include an analysis of how technology implementation is likely to impact capital equipment and engineering, research and development (ER&D) costs, the certification process, and emissions compliance.
- Examine the costs, cost multipliers and benefits that could accompany the introduction of technologies for reducing fuel consumption. Consider to the extent possible, initial and life-cycle costs, including such aspects as operation, maintenance, insurance, and other factors.
- To the extent possible, address uncertainties and perform sensitivity analyses for the fuel consumption and cost/benefit estimates and provide guidance to NHTSA on improving its uncertainty analyses given the relatively long time frame for these future estimates.
- Write a final report documenting its conclusions and recommendations.
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Committee Membership Roster Comments
Effective May 15, 2015, the committee membership has changed with the resignation of David F. Merrion.
Effective February 17, 2017, the committee membership has changed with the resignation of Amelia Regan.
Sponsors
Department of Transportation