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 43 for “"Engine emissions"”.
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Reduction of natural gas engine emissions using a novel aftertreatment system
… 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+ engine with and without the particulate matter (PM) filter and …
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Effects of artificial neural networks characterization on prediction of diesel engine emissions
… (PM). There is a societal need both to lower emissions and to predict or model emissions more accurately for inventory purposes. Engine modeling, and real time control are the most indispensable steps towards lowering engine emissions, and it is argued that this modeling can be achieved by …
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Effect of engine operating parameters and fuel characteristics on diesel engine emissions
… diesel fuel in a modern compression ignition engine, experiments were conducted on a MY 2002 Cummins 5.9 L diesel engine outfitted with high pressure, common rail fuel injection, a variable geometry turbo charger, cooled EGR and a fully configurable engine management computer. Additionally, …
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The effect of lubrication system and marine specific factors on diesel engine emissions
… Institute of Technology, Dept. of Ocean Engineering, 1994, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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Comparison of heavy-duty diesel engine emissions between an on-road route and engine dynamometer simulated on-road cycle
Heavy-duty diesel engines are known to emit concentrations of harmful compounds of oxides of nitrogen (NOx) and particulate matter (PM). As a means of emissions control, engine dynamometer certification is currently employed. Current certification cycles provide for standardized comparisons, but …
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Hybrid Dynamic Modelling of Engine Emissions on Multi-Physics Simulation Platform. A Framework Combining Dynamic and Statistical Modelling to Develop Surrogate Models of System of Internal Combustion Engine for Emission Modelling
… studied to generate alternative solutions for engine mapping and calibration problem, aiming to address the need to increase productivity (reduce development time) and to develop better models for the actual behaviour of the engine under real-world conditions. In this thesis, a dynamic …
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Hybrid Dynamic Modelling of Engine Emissions on Multi-Physics Simulation Platform. A Framework Combining Dynamic and Statistical Modelling to Develop Surrogate Models of System of Internal Combustion Engine for Emission Modelling
… studied to generate alternative solutions for engine mapping and calibration problem, aiming to address the need to increase productivity (reduce development time) and to develop better models for the actual behaviour of the engine under real-world conditions. In this thesis, a dynamic …
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Numerical modeling of piston secondary motion and skirt lubrication in internal combustion engines
Internal combustion engines dominate transportation of people and goods, contributing significantly to air pollution, and requiring large amounts of fossil fuels. With increasing public concern about the environment and the reliability of oil supplies, automotive companies are pushed to improve …
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Evaluation of advanced air-fuel ratio control strategies and their effects on three-way catalysts in a stoichiometric, spark ignited, natural gas engine
Engine emissions are a growing concern in the 21st century. As the world works to combat rising pollution levels, engine emissions are under scrutiny. Natural gas engines are increasing in popularity over diesel engines, due to the high availability of fuel and fewer pollutant emissions than …
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Enhanced engine efficiency through subsystem lubricant viscosity investigations
… the potential benefits in fuel efficiency, engine emissions, lubricant longevity, and engine durability. Two experimental testing platforms were designed and implemented to empirically study the effects of lubricant formulations on the internal combustion engine's frictional losses. A …
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On the control of airport departure operations.
… are evaluated by measuring and comparing engine emissions for given runway utilization rates.
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Effects of split injection and exhaust gas recirculation strategies on combustion and emissions characteristics in a modern V6 diesel engine
… combustion strategies in a modern V6 diesel engine fuelled with mineral diesel and Tallow Methyl Ester (TME)-diesel blends, in order to meet future emissions legislation. One of the main objectives of this research is to improve fuel consumption whilst minimising engine emissions through the …
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Characterization of infield duty cycles and exhaust emissions from diesel powered off-road heavy-duty equipment
… and evaluate techniques to measure exhaust emissions from diesel-powered off road equipment. Emissions data was collected from a Komatsu hydraulic excavator and a Caterpillar track-type tractor.;For the excavator, data was logged during in-field operation, and test cycles were created on a …
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Fluid mechanics of lubricant transport in non-contact regions in the piston ring pack in internal combustion engines
… of the piston ring pack in internal combustion engines. In order to achieve a satisfactory compromise, a systematic understanding of the lubricant transport in the piston ring pack is of critical importance. In the context of increasingly stringent standards on engine emissions, there is a more …
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Measurement of total hydrocarbon emissions with MEMS using a portable FID and a novel exhaust flow meter
… was to evaluate tools for in-field, on-board engine emissions measurements, namely, a Signal Model 3030PM hydrocarbon analyzer and McCrometer's V-Cone flow meter. The Signal Model 3030PM analyzer uses a heated flame ionizing detection scheme to measure hydrocarbons. The V-Cone is an …
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Design of oil consumption measuring system to determine the effects of evolving oil sump composition over time on diesel engine performance and emissions
… struggling because of the increasingly stricter emissions standards that will take effect in the near future. Diesel engine emissions are of particular interest because they are still less understood than gasoline powered internal combustion engines. On the solid side of the exhaust emissions …
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Modeling of the effects of lubricant chemistry on engine component wear and parametric analysis
… due to the strengthened regulations on diesel engine emissions, the dynamic understanding of engines' antiwear processes has drawn renewed attention. Oil additives can help engines resist wear by forming a thin solid layer of antiwear film, and zinc dialkyldithiophosphate (ZDDP) is the most …
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Understanding current environmental issues and their impact on ship design
… owners and operators on how to prepare for new engine emissions regulations that will be progressively more stringent than current regulations. To provide these recommendations, first a general study of current and future international, regional, and local marine emissions regulations was …
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Methodology For Validating Multi-Dimensional Engine Combustion Models And Fuel Surrogates Using An Optically Accessible Compression Ignition Engine
<p>In response to increasingly stringent engine emissions regulation, three dimensional in-cylinder combustion modeling is increasingly being used as a tool to optimize the combustion process and reduce the cost of experimental testing. Due to the complexity of the physical and chemical …
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Developing a Data-Driven Digital Twin Model for Lubricant Oil Transport and Oil Consumption Study in Internal Combustion Engines
Nowadays, internal combustion engines face significant challenges stemming from stricter emission regulations and from the introduction of propulsion systems that use alternative energies. Given its wide adoption and its apparent irreplaceability in the short term especially for the heavy duty …
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