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Navigation API Route Fuel Saving Opportunity Assessment on Large-Scale Real-World Travel Data for Conventional Vehicles and Hybrid Electric Vehicles: Preprint
12/22/2017
The green routing strategy instructing a vehicle to select a fuel-efficient route benefits the current transportation system with fuel-saving opportunities. This paper introduces a navigation API route fuel-saving evaluation framework for estimating fuel advantages of alternative API routes based on large-scale, real-world travel data for conventional vehicles (CVs) and hybrid electric vehicles (HEVs). The navigation APIs, such Google Directions API, integrate traffic conditions and provide feasible alternative routes for origin-destination pairs. This paper develops two link-based fuel-consumption models stratified by link-level speed, road grade, and functional class (local/non-local), one for CVs and the other for HEVs. The link-based fuel-consumption models are built by assigning travel from a large number of GPS driving traces to the links in TomTom MultiNet as the underlying road network layer and road grade data from a U.S. Geological Survey elevation data set. Fuel consumption on a link is calculated by the proposed fuel consumption model. This paper envisions two kinds of applications: 1) identifying alternate routes that save fuel, and 2) quantifying the potential fuel savings for large amounts of travel. An experiment based on a large-scale California Household Travel Survey GPS trajectory data set is conducted. The fuel consumption and savings of CVs and HEVs are investigated. At the same time, the trade-off between fuel saving and time saving for choosing different routes is also examined for both powertrains.
Authors: Zhu, L.; Holden, J.; Gonder, J.
Electric Ground Support Equipment at Airports
12/12/2017
Airport ground support equipment (GSE) is used to service airplanes between flights. Services include refueling, towing airplanes or luggage/freight carts, loading luggage/freight, transporting passengers, loading potable water, removing sewage, loading food, de-icing airplanes, and fire-fighting. Deploying new GSE technologies is a promising opportunity in part because the purchasers are generally large, technologically sophisticated airlines, contractors, or airports with centralized procurement and maintenance departments. Airlines could particularly benefit from fuel diversification since they are highly exposed to petroleum price volatility. GSE can be particularly well-suited for electrification because it benefits from low-end torque and has frequent idle time and short required ranges.
Authors: Johnson, C.
Overcoming Barriers to Electric Vehicle Charging in Multi-unit Dwellings: A Westside Cities Case Study
12/1/2017
The purpose of this case study is to explore barriers to plug-in electric vehicle (PEV) adoption for residents of multi-unit dwellings (MUDs) within the Westside Cities subregion of Los Angeles County and then identify MUDs within the study region that may exhibit high PEV demand and demand for low-cost electric vehicle supply equipment (EVSE) installation. This report also reviews the costs associated with EVSE installation at MUD sites, which are highly variable across properties. The report closes with a discussion of policy tools for scaling up charging infrastructure at MUD sites across the Westside Cities subregion.
Utility Investment in Electric Vehicle Charging Infrastructure: Key Regulatory Considerations
11/13/2017
The report provides an overview of the accelerating electrification of the transportation sector and explores the role of state utility regulators in evaluating potential investments by electric utilities in plug-in electric vehicle (PEV) charging infrastructure. The report identifies key considerations for regulators, including the amount of charging infrastructure needed to support PEVs, ways that regulators can help ensure equitable access to charging infrastructure, and opportunities to maximize the benefits of utility investment in charging infrastructure.
Authors: Allen, P.; Van Horn, G.; Goetz, M.; Bradbury, J.; Zyla, K.
The Barriers to Acceptance of Plug-in Electric Vehicles: 2017 Update
11/9/2017
Vehicle manufacturers, government agencies, universities, private researchers, and organizations worldwide are pursuing advanced vehicle technologies that aim to reduce the consumption of petroleum in the forms of gasoline and diesel. Plug-in electric vehicles (PEVs) are one such technology. This report, an update to the previous version published in December 2016, details findings from a study in February 2017 of broad American public sentiments toward issues that surround PEVs. This report is supported by the U.S. Department of Energy's Vehicle Technologies Office in alignment with its mission to develop and deploy these technologies to improve energy security, enhance mobility flexibility, reduce transportation costs, and increase environmental sustainability.
Authors: Singer, M.
What Fleets Need to Know About Alternative Fuel Vehicle Conversions, Retrofits, and Repowers
10/17/2017
Many fleet managers have opted to incorporate alternative fuels and advanced vehicles into their lineup. Original equipment manufacturers (OEMs) offer a variety of choices, and there are additional options offered by aftermarket companies. There are also a myriad of ways that existing vehicles can be modified to utilize alternative fuels and other advanced technologies. Vehicle conversions and retrofit packages, along with engine repower options, can offer an ideal way to lower vehicle operating costs. This can result in long term return on investment, in addition to helping fleet managers achieve emissions and environmental goals. This report summarizes the various factors to consider when pursuing a conversion, retrofit, or repower option.
Authors: Kelly, K.; Gonzales, J.
Lithium-ion Battery Safety Issues for Electric and Plug-in Hybrid Vehicles
10/1/2017
This technical report assesses lithium-ion battery vehicle safety issues and provides National Highway Traffic Safety Administration information that can support needs assessments and prioritize future research pertaining to lithium-ion battery vehicles. In addressing safety concerns about lithium-ion battery vehicles, this report provides a compendium of relevant and available technical background information. Included in this report is information on lithium-ion cell electrochemistry, design, and safety performance; lithium-ion battery system architecture; battery system analyses for various types of electric vehicles; battery management and control systems; optimal battery conditions; safety standards, including relevant gap analysis; hazards and risk mitigation strategies; and a summary of observations and considerations.
Authors: Denny Stephens, Paul Shawcross, Gabe Stout, Edward Sullivan, James Saunders
Enabling Fast Charging: A Technology Gap Assessment
10/1/2017
In this report, researchers at Idaho National Laboratory teamed with Argonne National Laboratory and the National Renewable Energy Laboratory to identify technical gaps to implementing an extreme fast charging network in the United States. This report highlights technical gaps at the battery, vehicle, and infrastructure levels.
Authors: Howell, D.; Boyd, S.; Cunningham, B.; Gillard, S.; Slezak, L.; Ahmed, S.; Bloom, I.; Burnham, A.; Hardy, K.; Jansen, A.N.; Nelson, P.A.; Robertson, D.C.; Stephens, T.; Vijayagopal, R.; Carlson, R.B.; Dias, F.; Dufek, E.J.; Michelbacher, C.J.; Mohanpurkar, M.; Scoffield, D.; Shirk, M.; Tanim, T.; Keyser, M.; Kreuzer, C.; Li, O.; Markel, A.; Meintz, A.; Pesaran, A.; Santhanagopalan, S.; Smith, K.; Wood, E.; Zhang, J.
Designing a Successful Transportation Project: Lessons Learned from the Clean Cities American Recovery and Reinvestment Act Projects
9/27/2017
The largest source of funding for alternative fuel vehicle and infrastructure projects in the U.S. Department of Energy's Clean Cities program's history came from the American Recovery and Reinvestment Act (Recovery Act). In 2009, the 25 cost-share projects totaled nearly $300 million in federal government investment. This effort included the involvement of 50 Clean Cities coalitions and their nearly 700 stakeholder partners who provided an additional $500 million in matching funds to support projects in their local communities. In total, those 25 projects established 1,380 alternative fueling stations and put more than 9,000 alternative fuel and advanced technology vehicles on the road. Together, these projects displaced 154 million gasoline gallon equivalents (GGE) of petroleum and averted 254,000 tons of greenhouse gas (GHG) emissions, while supporting U.S. energy independence and contributing to regional economic development. During post-project interviews, project leaders consistently cited a number of key components - ranging from technical and logistical factors, to administrative capabilities - for accomplishing an effective and impactful project. This report summarizes the high-level project design and administrative considerations for conducting a successful transportation project.
Authors: Kelly, K.; Singer, M.
Analysis of the Effect of ZEV Policies: State Level Incentives and the California Zero-Emission Vehicle Regulations
9/7/2017
This report assesses the effect of state-level policies on the sales of zero-emission vehicles (ZEVs) and plug-in hybrid electric vehicles (PHEVs). Two analysis approaches are applied. The first approach assesses the potential effect of state-level incentives through quantification of the monetary value of ZEV and PHEV incentives and comparison of these values to state-level sales of these vehicles. The second approach focuses on the effect of California ZEV regulations on sales in California and in the nine other states that have adopted these regulations. ZEV and PHEV sales in these ten states are projected through 2025 under a variety of scenarios based on the regulations and associated historic trends in sales and credit balances earned under these regulations.
National Plug-In Electric Vehicle Infrastructure Analysis
9/1/2017
This document describes a study conducted by the National Renewable Energy Laboratory quantifying the charging station infrastructure required to serve the growing U.S. fleet of plug-in electric vehicles (PEVs). PEV sales, which include plug-in hybrid electric vehicles (PHEVs) and battery electric vehicles (BEVs), have surged recently. Most PEV charging occurs at home, but widespread PEV adoption will require the development of a national network of non-residential charging stations. Installation of these stations strategically would maximize the economic viability of early stations while enabling efficient network growth as the PEV market matures. This document describes what effective co-evolution of the PEV fleet and charging infrastructure might look like under a range of scenarios. To develop the roadmap, NREL analyzed PEV charging requirements along interstate corridors and within urban and rural communities. The results suggest that a few hundred corridor fast-charging stations could enable long-distance BEV travel between U.S. cities. Compared to interstate corridors, urban and rural communities are expected to have significantly larger charging infrastructure requirements. About 8,000 fast-charging stations would be required to provide a minimum level of coverage nationwide. In an expanding PEV market, the total number of non-residential charging outlets or 'plugs' required to meet demand ranges from around 100,000 to more than 1.2 million. Understanding what drives this large range in capacity requirements is critical. For example, whether consumers prefer long-range or short-range PEVs has a larger effect on plug requirements than does the total number of PEVs on the road. The relative success of PHEVs versus BEVs also has a major impact, as does the number of PHEVs that charge away from home. This study shows how important it is to understand consumer preferences and driving behaviors when planning charging networks.
Authors: Wood, E.; Rames, C.; Muratori, M.; Raghavan, S.; Melaina, M.
Transportation Electrification Beyond Light Duty: Technology and Market Assessment
9/1/2017
This report focuses on electrification of government, commercial, and industrial fleets and provides the background necessary to understand the potential for electrification in these markets. Specifically, it covers the challenges and opportunities for electrification in the service and goods and people movement fleets to guide policy makers and researchers in identifying where federal investment in electrification could be most beneficial.
Authors: Birky, A.K.; Laughlin, M.; Tartaglia, K.; Price, R.; Lin, Z.
Sustainable Transportation Program 2016 Annual Report
8/24/2017
The efficiency and security of the transportation system affect us all - from the time and energy spent on our daily commutes to the availability of goods in our local stores. Also impacted are our pocketbooks, both as individuals and as a nation.
Transportation accounts for about 70% of national petroleum use, with Americans spending more than $177 billion to import oil in 2015. That same year, oil dependence cost the US $29 billion in lost potential GDP. Creating transportation technologies that reduce dependence on foreign oil; boost America's economy; improve national energy security; and deliver to consumers affordable, environmentally friendly choices is of critical importance.
ORNL's Sustainable Transportation Program (STP) works with government and industry to develop scientific knowledge and new technologies that accelerate the deployment of energy-efficient vehicles and intelligent, secure, and accessible transportation systems.
Scientists are tackling complex challenges in transportation using comprehensive capabilities at ORNL's National Transportation Research Center and the laboratory's signature strengths in high-performance computing, neutron sciences, materials science, and advanced manufacturing. Research focuses on electrification, efficiency of combustion and emissions, data science and automated vehicles, and materials for future systems.
Fuel Consumption Sensitivity of Conventional and Hybrid Electric Light-Duty Gasoline Vehicles to Driving Style
8/11/2017
Aggressive driving is an important topic for many reasons, one of which is higher energy used per unit distance traveled, potentially accompanied by an elevated production of greenhouse gases and other pollutants. Examining a large data set of self-reported fuel economy (FE) values revealed that the dispersion of FE values is quite large and is larger for hybrid electric vehicles (HEVs) than for conventional gasoline vehicles. This occurred despite the fact that the city and highway FE ratings for HEVs are generally much closer in value than for conventional gasoline vehicles. A study was undertaken to better understand this and better quantify the effects of aggressive driving, including reviewing past aggressive driving studies, developing and exercising a new vehicle energy model, and conducting a related experimental investigation. The vehicle energy model focused on the limitations of regenerative braking in combination with varying levels of driving-style aggressiveness to show that this could account for greater FE variation in an HEV compared to a similar conventional vehicle. A closely matched pair of gasoline-fueled sedans, one an HEV and the other having a conventional powertrain, was chosen for both modeling and chassis dynamometer experimental comparisons. Results indicate that the regenerative braking limitations could be a main contributor to the greater HEV FE variation under the range of drive cycles considered. The complete body of results gives insight into the range of fuel use penalties that results from aggressive driving and why the variation can be larger on a percent basis for an HEV compared to a similar conventional vehicle, while the absolute fuel use penalty for aggressive driving is generally larger for conventional vehicles than HEVs.
Authors: Thomas, J.; Huff, S.; West, B.; and Chambon, P.
Foothill Transit Battery Electric Bus Demonstration Results: Second Report
6/30/2017
This report summarizes results of a battery electric bus (BEB) evaluation at Foothill Transit, located in the San Gabriel and Pomona Valley region of Los Angeles County, California. Foothill Transit is collaborating with the California Air Resources Board and the U.S. Department of Energy's (DOE's) National Renewable Energy Laboratory to evaluate its fleet of Proterra BEBs in revenue service. The focus of this evaluation is to compare performance of the BEBs to that of conventional technology and to track progress over time toward meeting performance targets. This project has also provided an opportunity for DOE to conduct a detailed evaluation of the BEBs and charging infrastructure. This is the second report summarizing the results of the BEB demonstration at Foothill Transit and it provides data on the buses from August 2015 through December 2016. Data are provided on a selection of compressed natural gas buses as a baseline comparison.
Authors: Eudy, L.; Jeffers, M.
