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 31 for “"Gasoline engines"”.
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Multihole injectors for direct-injection gasoline engines
… for Direct-Injection (DI) Spark Ignition (SI) gasoline engines. Having explored thoroughly swirl pressure atomisers and their spray behaviour, multi-hole nozzles represent the second-generation injectors. Thus, complete investigation of multi-hole nozzle flow, spray characteristics and their …
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Investigation to direct ethanol injection in spark ignition gasoline engines
… method of using ethanol fuel by blending gasoline and ethanol fuel does not fully exploit ethanol’s advantages. The dual-fuel injection strategy, ethanol direct injection plus gasoline port injection (EDI+GPI), offers a potentially new way to make use of ethanol fuel more effectively and …
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Fuel spray modelling in direct-injection diesel and gasoline engines
… complex physical process in internal combustion engines, which need to be continuously optimised to get the best compromise between fuel economy, emissions and power output/drivability. Among the variety of computational tools developed by researchers to investigate the multi-Phase flow …
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Characterization of the exhaust gas condensate pH values of gasoline engines
Exhaust Gas Recirculation has been used in gasoline engines to reduce NOx formation and part-load throttle loss for many years. More recently, there is a trend towards down-sizing and turbocharging engines as the strategy helps to improve fuel economy. Cooled low pressure EGR complements …
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Simulations And Experiments Of Fuel Injection, Mixing And Combustion In Di Gasoline Engines
… for its improved performance and efficiency in gasoline spark-ignition engines. In order to take all the advantages of the GDI technology, it is important to investigate in detail the interactions of fuel spray and combustion system, such as air-fuel mixing, in-cylinder flow development, surface …
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A critical study of various types of exhaust gas analyzers for gasoline engines
It is quite common practice in automotive and aircraft engine maintenance, operation, and research to employ any one of several types of instruments now on the market for determining the air-fuel ratio by exhaust gas analysis. It was the purpose of this investigation to determine the most important …
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Study of extended stroke gasoline engines : a thermodynamic system modelling and analysis of improvement in fuel consumption
This thesis studies the benefit and challenges of using an extended stroke engine on the automotive application. For the purpose of the study, a one-dimensional thermodynamic model was built using the GT- Power software. GM LNF 2.0 liter engine was used as the candidate of study, the base model was …
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Comparative analysis of automotive powertrain choices for the near to mid-term future
… types to be assessed include naturally aspirated gasoline engines, turbocharged gasoline engines, diesel engines, electric hybrids using gasoline engines and advanced transmissions. Advancements in aerodynamics, weight reduction and tire rolling friction are also taken into account. The basis for …
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Abnormal combustion - methanol versus gasoline
The maximum efficiency of conventional gasoline engines is largely determined by the compression ratio, and this is limited by the onset of kno8k. The maximum cylinder size is similarly constrained. The relatively higher knock resistance of methanol opens up possibilities for increased efficiency …
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Reactive based NOx sensor
Diesel engines exhibit better fuel economy and emit fewer greenhouse gases than gasoline engines. Modern diesel technology has virtually eliminated carbon monoxide and particulate emissions. Sulfur oxide emissions have been eliminate by the use of ultra-low sulfur fuel. Nitrogen oxide (NOx) …
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Battery Centric Serial Hybrid Aircraft Performance and Design Space
… and for their potential to operate where gasoline engines alone cannot. A serial hybrid configuration also allows for a controlled efficiency output and noise footprint to be able to either reduce emissions and cost or mitigate noise over noise sensitive areas. While a fully electric …
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Combustion and soot formation modelling in modern gasoline direct injection engines using computational fluid dynamics
… of soot precursors in modern direct injection gasoline engines, with a particular emphasis on statistically efficient calibration of key sub-models. The research addresses the challenges associated with accurately representing combustion processes, liquid fuel films on cylinder surfaces, and …
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Modeling internal combustion engine three-piece oil control ring coupling reduced order oil transport based on neural network
… and improving efficiency of internal combustion engines are the major focuses in modern automotive industry. Lubrication oil leakage contributes to particle formation and piston ring friction occupies 1/3 to 1/2 of total mechanical losses in engines. In almost all of modern gasoline engines, …
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Ionization in diesel combustion: Mechanism, new instrumentation and engine applications
<p>Diesel engines are known for their superior fuel economy and high power density. However they emit undesirable high levels of nitrogen oxide (NOx) and black particulate smoke (Soot). To reduce these emissions, close loop engine control strategies are required. Therefore, there is a need for an …
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Comparison of performance and emission characteristics between ceramic and metallic catalytic converter
… solution to reduce exhaust emissions from gasoline engines where ceramic and metallic catalytic converters are the most common types of catalytic converter used. This study focuses to examine the performance of ceramic and metallic catalytic converters through simulation and experimental in …
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Developing an accelerated aging system for gasoline particulate filters and an evaluation test for effects on engine performance
… level of particulate matter (PM) emitted from gasoline engines equipped with direct fuel injection. Gasoline particulate filters (GPFs) present one strategy for meeting PM limits over the full operating range of the engine. Over time these filters accumulate incombustible ash, increasing system …
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Examination of the high load limit of an HCCI engine
… homogenous charge compression ignition (HCCI) to gasoline engines is constrained by many factors. This work examines constrains imposed by nitric oxide (NOx) emission and by the need to maintain a minimum catalyst temperature on HCCI operation. Then the nature of the approach to high load limit …
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Modeling of liner finish effects on oil control ring lubrication in internal combustion engines based on deterministic method
… ring is widely used in the automotive diesel engines, and is gaining more and more applications in the modern designs of gasoline engines. Its interaction with the cylinder liner surface accounts for around 10% of the total frictional losses within an internal combustion engine, and is the …
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The effects of fuel volatility and operating conditions on sprays from pressure-swirl fuel injectors
Optimal design of modern direct injection gasoline engines depends heavily on the fuel spray. Most of the studies published regarding these fuel sprays involve cold bench tests or motored optical engines, neglecting the roles of the fuel volatility and temperature. This study, therefore, was …
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