Performance Evaluation and Control Strategy Comparison of Supercapacitors for a Hybrid Electric Vehicle

Electrification of powertrain system is a great technical progress of traditional vehicle, leading to a significant reduction of fuel consumption and emission pollution. Energy storage system (ESS) normally consisting of batteries is a key component of an electric vehicle or hybrid electric vehicle. An ESS can recover braking energy during the regenerative braking process. Currently, lithium-ion batteries are the main energy storage device due to their high energy density. However, sometimes, a sudden large increase of operation current is required during acceleration or regenerative braking processes, which will jeopardize the operation life of batteries. A supercapacitor takes advantage of high power density and can tolerate large current in a short time. Application of supercapacitor in an ESS can reduce the peak current of batteries effectively, and the life time of batteries can be extended. Meanwhile, the braking energy can also be recovered sufficiently. Supercapacitors can be used solely in some hybrid electric vehicles. In this chapter, the application of supercapacitors in electric vehicles or hybrid electric vehicles is reviewed briefly. Then, the performance of a series hybrid transit bus, which uses a compressed natural gas engine and supercapacitors as power sources, is analyzed

Greenhouse Gas Reduction Opportunities for Local Governments: A Quantification and Prioritization Framework

Local governments have steadily increased their initiative to address global climate change, and many present their proposed strategies through climate action plans (CAPs). This study conducts a literature review on current local approaches to greenhouse gas (GHG) reduction strategies by assessing CAPs in California and presents common strategies in the transportation sector along with useful tools. One identified limitation of many CAPs is the omission of quantitative economic cost and emissions data for decision-making on the basis of cost-effectiveness. Therefore, this study proposes a framework for comparing strategies based on their life cycle emissions mitigation potential and costs. The results data can be presented in a marginal abatement cost curve (MACC) to allow for side-by-side comparison of considered strategies. Researchers partnered with Yolo and Unincorporated Los Angeles Counties to analyze 7 strategies in the transportation and energy sectors (five and two, respectively). A MACC was subsequently developed for each county. Applying the life cycle approach revealed strategies that had net cost savings over their life cycle, indicating there are opportunities for reducing emissions and costs. The MACC also revealed that some emissions reduction strategies in fact increased emissions on a life cycle basis. Applying the MACC framework to two case study jurisdictions illustrated both the feasibility and challenges of including quantitative analysis in their decision-making process. An additional barrier to using the MACC framework in the context of CAPs, is the mismatch between a life cycle and annual accounting basis for GHG emissions. Future work could explore more efficient data collection, alternative scopes of emissions for reporting, and environmental justice concerns.View the NCST Project Webpag

An assessment of inductive coupling roadway powered vehicles

The technical concept underlying the roadway powered vehicle system is the combination of an electrical power source embedded in the roadway and a vehicle-mounted power pickup that is inductively coupled to the roadway power source. The feasibility of such a system, implemented on a large scale was investigated. Factors considered included current and potential transportation modes and requirements, economics, energy, technology, social and institutional issues. These factors interrelate in highly complex ways, and a firm understanding of each of them does not yet exist. The study therefore was structured to manipulate known data in equally complex ways to produce a schema of options and useful questions that can form a basis for further, harder research. A dialectical inquiry technique was used in which two adversary teams, mediated by a third-party team, debated each factor and its interrelationship with the whole of the known information on the topic

Vermont Transportation Energy Profile 2021

Slightly more than one-third of the total energy consumed in Vermont is used for transportation (see Figure E-1). Transportation energy is overwhelmingly derived from fossil fuels, with over 95% coming in the form of gasoline and diesel fuel. Transportation is also the largest source of greenhouse gas (GHG) emissions in the State, accounting for 39.1% GHGs in 2017. Consequently, the 2016 Vermont Comprehensive Energy Plan (CEP) included three goals and nine supporting objectives related to reducing transportation sector energy consumption and GHG emissions (VDPS, 2016). The 2021 Vermont Transportation Energy Profile (“the Profile”) is the fifth installment of a biannual reporting series that evaluates the State’s progress toward achieving these transportation sector targets

Solving Commuting Challenges with RTS Bus Rapid Transit (RTS-BRT) Rochester, NY

The public transport service in Rochester, NY, is inefficient in terms of reliability, safety, comfort, security, waiting, transfer, and longer commute hours. The public transportation system needs significant transformation to overcome this alleviating issue and relieve the burden on low-income residents, pedestrians, and non-motorized vehicle users. The research objective of this thesis is to advance and discover a connection pattern between transportation, urban sprawl, poverty, and unemployment in Rochester, NY. It targets the low-income resident’s detachment from diverse uses, residential settlement, locations of jobs, and transportation options. The research analyses how-: people commute to work, how long the commute takes, the rate of car ownership, and the financial burdens of owning a car. Furthermore, the research goes deeper into the energy demands and emission reduction caused by the transport sector. The data collection method used for the analysis is metanalysis, gathering data from local authority websites, organizations, research papers, and media. Sustainable transport can be a catalyst for urban development that prioritizes equity, accessibility, and time savings for the low-income commuter while reducing emissions and increasing traffic safety. Thus, all benefactors are a modal shift to lower-carbon transport systems such as walking, cycling, public transport, alternative fuel vehicles, modifying roads, and minimizing travel time. The scope of this study is to assess the environmental, social, and economic impacts caused by car dependency in Rochester, NY. As a result, the research probes the opportunities and challenges of leveraging Transit-Oriented Development (TOD) while introducing a Bus Rapid Transit (BRT) system

Transport in developing countries and climate policy: suggestions for a Copenhagen agreement and beyond

Also in the global South, transport already significantly contributes to climate change and has high growth rates. Further rapid motorisation of countries in Asia and Latin America could counteract any climate efforts and aggravate problems of noxious emissions, noise and congestion. This Paper aims at connecting the need for transport actions in developing countries to the international negotiations on a post-2012 climate change agreement. It outlines the decisions to be taken in Copenhagen and the preparations to adequately implement these decisions from 2013. Arguing, that a sustainable transport approach needs to set up comprehensive policy packages, the paper assesses the substance of current climate negotiations against the fit to sustainable transport. It concludes that the transport sector's importance should be highlighted and a significant contribution to mitigation efforts required. Combining the two perspectives lead to several concrete suggestions: Existing elements of the carbon market should be improved (e.g. discounting), but an upscale of the carbon market would not be an appropriate solution. Due to a lack of additionality, offsetting industrialised countries' targets would finally undermine the overall success of the climate agreement. Instead, a mitigation fund should be established under the UNFCCC and financed by industrialised countries. This fund should explicitly enable developing countries to implement national sustainable development transport and mobility policies as well as local projects. While industrialized countries would set up target achievement plans, developing countries should outline low carbon development strategies, including a section on transport policy. -- Die rasante Motorisierung Asiens und Lateinamerikas könnte die Klimaschutzerfolge konterkarieren. Bis 2030, so Prognosen der IEA, werden im Verkehrssektor 2,5 Gigatonnen CO2 mehr emitiert als heute; 80 Prozent davon in den Ländern des Südens. Das Papier soll die Notwendigkeit verdeutlichen, dass in den Entwicklungsländern im Verkehrssektor heute schon Maßnahmen ergriffen werden müssen und die Klimaverhandlungen für die Post-Kyoto-Phase eine wichtige Gelegenheit sind. Die Ansätze in den gegenwärtigen Klimaverhandlungen werden den Anforderungen einer nachhaltigen Verkehrspolitik gegenübergestellt und dafür plädiert, den Stellenwert des Verkehrssektors zu den Klimaschutzanstrengungen zu erhöhen. Dafür werden mehrere konkrete Vorschläge gemacht: So sollten vorhandene Elemente des Emissionshandels verbessert werden, die eigentlich angemessene Lösung sei jedoch ein neues Instrument: Um die Entwicklungsländer in die Lage zu versetzen Maßnahmen in der Verkehrspolitik umzusetzen und Politiken und Projekte vor Ort zu fördern, sollte ein von den Industrieländern finanzierter Klimaschutzfonds unter dem UN-Klimaregime eingerichtet werden. In Strategien für eine kohlenstoffarme Entwicklung sind dabei die Politikinstrumente einer nachhaltigen Verkehrsentwicklung zu integrieren.

Interventions in LICs and LMICs to Improve Air Quality and/or Mitigate its Impacts

This rapid literature review summarises evidence on air quality interventions in LICs and LMICs to improve air quality and/or mitigate its impacts. The review found limited evidence derived from such countries and instead draws on evidence from reviews and compilations compiled by bodies such as Public Health England (PHE) and the World Health Organisation (WHO). The evidence base for what works where and why is limited, inconsistent and requires further assessment. It is broadly acknowledged that cooperation across sectors and at different levels - city, regional and national - is crucial to effectively address air pollution. An array of interventions are identified in this rapid literature review and clustered around 7 areas. It is important to note that single interventions are unlikely to have a significant impact on long-term air pollution trends, but a set of well-designed and implemented interventions can reap benefits.FCDO (Foreign, Commonwealth and Development Office