Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 179 for “"Fuel Economy"”.
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Computer control of engine-transmission system for improving fuel economy
… works along a line of minimum brake specific fuel consumption (BSFC).
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Fuel economy of a turbocharged, single-cylinder, four-stroke engine
… engine are correlated to engine performance and fuel economy. According to the modeled engine, a 3.0 liter capacitor had better peak power and fuel economy at high loads and speeds than a 2.4 or 1.25 liter capacitor. Additionally, forced convection cooling on the capacitor using a fan allowed the …
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Evaluating Trends in Light-Duty Vehicle Technologies to Project Fuel Economy
Predicting the fuel economy of future light-duty vehicles provides insight into the expected greenhouse gas emissions, oil consumption, and operating costs in the transportation sector. Fuel economy is difficult to directly predict, however, due to the large number of vehicle characteristics that …
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Investigation of Emissions and Fuel Economy for the Integrated Bus Information System
… of this study was to investigate emissions and fuel economy, and develop an Integrated Bus Information System (IBIS) for the Federal Transit Administration (FTA). IBIS included the development of transit fleet emissions models to assist transit agencies in evaluating the emissions implications …
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Fuel economy regulations and efficiency technology improvements in U.S. cars since 1975
… in the United States. Corporate Average Fuel Economy (CAFE) standards are the primary policy tool addressing petroleum consumption in the U.S., and are set to tighten substantially through 2025. In this dissertation, I address several interconnected questions on the technical, policy, and …
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Trends and drivers of the performance : fuel economy tradeoff in new automobiles
… in the United States have steadily become more fuel-efficient since the 1970s, and assessments of emerging technologies demonstrate a significant potential for continued evolutionary improvements. However, historic efficiency improvements have not always translated into reduced rates of fuel …
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Vehicle fuel economy benefit and aftertreatment requirement of an HCCI-SI engine system
This body of work dimensions the HCCI fuel economy benefits and required aftertreatment performance for compliance with emissions regulations in North America and Europe. The following parameters were identified as key factors influencing the benefit of implementing HCCI over driving cycle: * …
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Automaker technology strategy and the cost of complying with the corporate average fuel economy standards
… to close the gap between current new vehicle fuel economy and the fuel economy mandated by CAFE: (1) deployment of fuel saving technologies to improve the fuel economy of conventional internal combustion engine (ICE) vehicles; or (2) increasing the share of high-efficiency electric vehicles …
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Understanding the challenges in HEV 5-cycle fuel economy calculations based on dynamometer test data
EPA testing methods for calculation of fuel economy label ratings, which were revised beginning in 2008, use equations that weight the contributions of fuel consumption results from multiple dynamometer tests to synthesize city and highway estimates that reflect average U.S. driving patterns. The …
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Predicting hybrid vehicle fuel economy and emissions with neural network models trained with real world data
… hybrid vehicle simulation models for fuel economy (FE) exist but are computationally and financially expensive. These models simulate aspects of real-world drive cycles that include the driving environment, thermal management, driver input, and powertrain component behavior. In this …
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The influence of gasoline prices and consideration sets on the fuel economy of new vehicle sales
… factors that influence consumer investment in fuel economy when purchasing a new vehicle is critical for stakeholders including environmental policy makers, automotive manufacturers and oil companies. The energy economics literature shows that consumers are relatively rational in how much fuel …
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Design and prototype of dual loop lubricant system to improve engine fuel economy, emissions, and oil drain interval
Regulations aimed at improving fuel economy and reducing harmful emissions from internal combustion engines place constraints on lubricant formulations necessary for controlling wear and reducing friction. Viscosity reduction results in fuel economy improvement, with benefits of up to three percent …
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A Techno-Economic Investigation of Advanced Vehicle Technologies and Their Impacts on Fuel Economy, Emissions, and the Future Fleet
… vehicle technologies that contribute to fuel and emissions reductions while preserving consumer choice, and to evaluate their technological performance and economic practicability as essential aspects of meeting aspirational targets and regulatory requirements associated with the future …
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The effects of drive cycle accessory load and degree of hybridization on fuel economy and emissions for hybrid electric buses
… in recent years. This is mainly due to rising fuel prices and increasing environmental awareness. By implementing electricity as one of the power sources, a HEV can not only reduce fuel consumption but can also decrease tailpipe emissions. In this thesis, the software package Powertrain Systems …
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The effect of carburetor refurbishing on emissions, performance, and fuel economy in a classic pickup tested using real-world tests
… Pickup would affect emissions, performance, and fuel economy. The test used were real-world tests that anyone, with or without access to a laboratory, can perform. The design of the real-world tests is important for ascertaining good results. Thought should go into how to perform the tests safely …
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The influence of fuel price on an automaker's decision to lightweight cars via materials substitution
… examines how the costs and benefits of improving fuel economy of vehicles via lightweighting with aluminum closures change with gas price. A process-based cost model is used to evaluate the costs of lightweighting with aluminum for six representative vehicles, and an industry choice-based conjoint …
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Design of a novel rotary compact power pack for the series hybrid electric vehicle. Design and simulation of a compact power pack consisting of a novel rotary engine and outer rotor induction machine for the series hybrid electric vehicle powertrain.
… reduce exhaust emissions and increase fuel economy. Power packs are the most fundamental components in a series powertrain configuration of a hybrid vehicle, which produce the necessary power to run the vehicle. The aim of this project is to design a compact power pack for a series …
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