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.
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Showing 1 to 20 of 48 for “"Aftertreatment"”.
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Reduction of natural gas engine emissions using a novel aftertreatment system
… of this study was to develop an exhaust aftertreatment system to reduce gaseous and particulate matter emissions from natural gas fueled vehicles. Specific objectives of this study were to evaluate and characterize emissions from a natural gas fueled vehicle powered by a Cummins C8.3G+ …
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Evaluating heavy-duty diesel engine aftertreatment devices with a split exhaust configuration
West Virginia University evaluated diesel oxidation catalysts (DOC) and lean-NOx catalysts as part of the Diesel Emissions Control-Sulfur Effects (DECSE) program. In order to perform thermal aging of the DOC and lean-NOx catalysts simultaneously and economically, each catalyst was sized to …
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Multi-Physics Co-Simulation of Engine Combustion and Exhaust Aftertreatment system: Development of a Multi-Physics Co-Simulation Framework of Engine Combustion and Exhaust Aftertreatment for Model-Based System Optimisation
… emissions model is then linked with an exhaust aftertreatment system model in MATLAB Simulink, creating a multi-physics model-based co-simulation framework of engine performance, combustion characterisation, in-cylinder emissions formation and aftertreatment efficiency.
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Vehicle fuel economy benefit and aftertreatment requirement of an HCCI-SI engine system
… 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: * Power-to-weight ratio * …
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The effect of alternative fuels and aftertreatment devices on measured mobile school bus emissions
… operating conditions. Four fuel blends and three aftertreatment devices were tested on three school bus engines.</p> <p>For all of the tests, exhaust gas emission measurements were made using a Sensors Semtech-D to measure CO, CO<sub>2</sub>, NO<sub>2</sub>, NO, O<sub>2</sub>, and HC, along with a …
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The Effect Of Biodiesel Blends On A Multi-Cylinder Engine And The Impact On Aftertreatment
<p>Recently, topics including global warming, increased environmental awareness, recycling, and organically produced meat and vegetables have been prevalent in the media and research arenas. The rapidly increasing cost for fossil fuels and the pursuit of environmental conservation has brought about …
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Multiscale Modelling for Automotive Exhaust-Gas Aftertreatment – From the Quantum Chemistry to the Engineering Level
Gegenstand der vorliegenden Arbeit ist die theoretische Untersuchung eines neuartigen Abgas-Nachbehandlungssystemes unter Verwendung eines Multiskalen-Modellierungsansatzes. Prozesse vom Nanobereich (chemische Reaktionen) bis zum Makrobereich (zeitabhängige Umsätze im katalytischen Einzelkanal) …
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Heavy-duty diesel vehicle Nox̳ aftertreatment in 2010 : the infrastructure and compliance challenges of urea-SCR
… regulations are prompting the use of PM and NOx aftertreatment systems in the US, the EU and Japan. In the US, the EPA Highway Diesel Rule, which will be fully implemented in 2010, has stimulated debate over whether urea selective catalytic reduction (urea-SCR) or lean NOx traps (LNT) are the …
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The nature of lubricant-derived ash-related emissions and their impact on diesel aftertreatment system performance
Diesel particulate filters (DPF) have seen widespread use in on- and off-road applications as an effective means for meeting increasingly stringent particle emissions regulations. Over time, incombustible material or ash, primarily derived from metallic additives in the engine lubricant, …
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Performance evaluation of exhaust aftertreatment devices used for emissions control on diesel engines employed in underground coal mines
This study was initiated to assist the WV Diesel Equipment Commission in its promulgation of initial rules, requirements, and standards governing the operation of diesel-powered equipment in underground coal mines. Four different engines and various exhaust after treatment devices that represent …
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Development of a spatially-resolved technique for the measurement of effective diffusions and Its application to the reaction modelling of deactivated washcoated catalytic monoliths
… the demand to optimise existing vehicle aftertreatment systems. Increasingly stringent emission regulations in many countries lead to challenges for automobile manufacturers to meet carbon monoxide (CO), total hydrocarbon and nitrogen oxides emission standards, thus further optimisation …
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System modeling, analysis, and optimization methodology for diesel exhaust after-treatment technologies
Developing new aftertreatment technologies to meet emission regulations for diesel engines is a growing problem for many automotive companies and suppliers. Balancing manufacturing cost, meeting emission performance, developing competitive engine power, reducing weight and operational costs are all …
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Integration of Hidden Markov Modelling and Bayesian Networks for fault analysis of complex systems. Development of a hybrid diagnostics methodology based on the integration of hidden Markov modelling and Bayesian networks for fault detection, prediction and isolation of complex automotive systems
… engineered systems. The automotive exhaust gas Aftertreatment system is a complex engineered system consisting of several subsystems working interdependently to meet emission legislations. The Aftertreatment system is a highly nonlinear, dynamic and non-stationary system. Consequently, it has …
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Integration of Hidden Markov Modelling and Bayesian Networks for fault analysis of complex systems. Development of a hybrid diagnostics methodology based on the integration of hidden Markov modelling and Bayesian networks for fault detection, prediction and isolation of complex automotive systems
… engineered systems. The automotive exhaust gas Aftertreatment system is a complex engineered system consisting of several subsystems working interdependently to meet emission legislations. The Aftertreatment system is a highly nonlinear, dynamic and non-stationary system. Consequently, it has …
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Performance effects and causal mechanisms of mid-channel congestion in diesel particulate filters
… is a ~$5,000-$50,000 USD critical component of aftertreatment systems installed in diesel engine-powered vehicles. The device is designed to trap particles emitted by the diesel combustion process in order to prevent their release into the surrounding environment, thereby reducing pollution …
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Applicability of hybrid methods in engine control system design
… of engine management for diesel exhaust aftertreatment. Theoretical work has been supported by experiments carried out in a diesel engine test cell. A control relevant air-path model was developed using experimental work carried out on a diesel engine and dynamometer, with the aim of …
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Passive regeneration : long-term effects on ash characteristics and diesel particulate filter performance
… in optimizing the design of the combined engine-aftertreatment- lubricant system for future diesel engines, balancing the necessities of additives for adequate engine protection with the requirements for robust aftertreatment systems.
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Investigation of PM Formation and Evolution in Plumes Emitted by Heavy-Duty Diesel Vehicles: Wind Tunnel Study
… drastic technological improvements in diesel aftertreatment systems, particularly in reducing Particulate Matter (PM) emissions. Studies that have led to these technological advancements were made in controlled laboratory environments and are not representative of real-world emissions from …
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Modeling and interpreting the observed effects of ash on diesel particulate filter performance and regeneration
… in optimizing the design of the combined engine-aftertreatment-lubricant system for future diesel engines and in understanding the requirements for robust aftertreatment systems.
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