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 50 for “"cylinder pressure"”.
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Robust design evolution and impact of In-Cylinder Pressure Sensors to combustion control and optimization : a systems and strategy perspective
In-Cylinder Pressure Sensors (ICPS) today are close to satisfying the robustness, performance and cost requirements for application to closed loop control and monitoring of production automotive engines. Using the Robust Design framework as a compass, this thesis first checks the evidence for …
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Estimation of the In-Cylinder Air/Fuel Ratio of an Internal Combustion Engine by the Use of Pressure Sensors
This thesis investigates the use of cylinder pressure measurements for estimation of the in-cylinder air/fuel ratio in a spark ignited internal combustion engine. An estimation model which uses the net heat release profile for estimating the cylinder air/fuel ratio of a spark ignition engine is …
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Characterization of knocking combustion and heat transfer in a spark ignition engine
… was conducted to investigate combustion and in-cylinder heat transfer characteristics under light and heavy knocking conditions in a spark ignition engine. A special, single cylinder, Mitsubishi R52 engine was used, in its extended piston configuration. Fast response heat flux probes on the …
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Phenomena that determine knock onset in spark-ignited engines
Experiments were carried out to collect in-cylinder pressure data and microphone signals from a single-cylinder test engine using spark timings before, at, and after knock onset for four different octane-rated toluene reference fuels. This data was then processed and analyzed in various ways to …
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Investigating the performance and emission characteristics of diesel-LPG engine operation
… modes. The model is calibrated using the peak cylinder pressure, the timing of the peak cylinder pressure, power and torque. For the maximum LPG scenario (70% diesel and 30% LPG) investigated at 2435 rpm, compared to the diesel engine operation, the maximum cylinder pressure was shown to …
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Conceptual evaluation of hydrogen hybrid combustion for heavy-duty engines using CFD modelling
… available software Siemens Star CCM+ with the In-Cylinder add-on and a complex chemistry combustion model. Multiple pre-chamber geometries were evaluated, focusing on parameters such as the number and flow area of pre-chamber nozzles, pre-chamber volume, and the implementation of a dual injector …
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Combustion characteristics of a spark ignition engine operating with liquid lpg injection
… coefficient of variation (COV) of maximum in-cylinder pressure peak throughout the testing than gasoline. In addition, liquid LPG injection also showed improvement on the in-cylinder pressure, rate of pressure rise (ROPR) and rate of heat release (ROHR) where the maximum plot of these …
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Measurement and modelling of combustion in a spark ignition engine
… and knock, have upon it. A Ricardo E6 single cylinder variable compression ratio research engine was instrumented to allow measurement of: cylinder pressure, temperatures, speed, load, fuel flow and air flow. The engine was also fitted with an optical slice that allowed optical access to the …
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Performance and emission characteristics of a gas-diesel engine
… performance and emission characteristics of high pressure injection of natural gas with liquid pilot-diesel fuel (ie. gas-diesel operation) was investigated in a single-cylinder, two-stroke compression-ignition engine with a poppet-valve gas-diesel injector. The investigated injector geometries …
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Effect of start injection toward combustion, performances and emision characteristic of B20 biodiesel fuel
… measurements including exhaust emissions, cylinder pressure, heat release rate, and ignition delay were conducted. As a result, the use of B20 fuel showed a reduction on engine performances; BT (0.3%), BTE (1.44%), increase of BSFC (up to 3.75%) in comparison with B10 fuels at 2400rpm …
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Data-Rich Multivariable Control of Heavy-Duty Engines
… and evaluated experimentally on a full-scale six-cylinder heavy-duty engine. The work is divided into four areas: virtual emissions sensing, dynamic emissions models, optimal engine control, and control of sensitive combustion modes. The theme of the thesis is to show how feedback control based on …
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Thermal efficiency and emission analysis of advanced thermodynamic strategies in a multi-cylinder diesel engine utilizing valve-train flexibility
… Fortunately, and as this thesis describes, cylinder deactivation can be used to increase exhaust temperatures above 300°C at the loaded idle condition without increasing fuel consumption. Further, at the unloaded idle condition, the combination of cylinder deactivation and flexible valve …
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Sviluppo di algoritmi avanzati di analisi e diagnosi combustione in tempo reale per motori endotermici alternativi
… Real time combustion analysis, based on the in-cylinder pressure signal, can significantly improve the calibration of the engine control strategies and the development of new algorithms, giving instantaneous feedback on the engine behavior. A complete combustion analysis and diagnosis system has …
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Emissions and in-cylinder combustion characteristics of Fischer-Tropsch and conventional diesel fuels in a modern CI engine
… effects of both the fuel properties and in-cylinder combustion characteristics in modern diesel engines are still not well understood. In this study a 2002, six-cylinder, 5.9 liter, Cummins ISB 300 diesel engine, outfitted with an in-cylinder pressure transducer, was subjected to a subset of …
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An improved method of investigation of combustion parameters in a natural gas fuelled SI engine with EGR and H2 as additives
… and emissions, based on the online analysis of cylinder pressure is introduced. A diagnostic method to study the heat release rate in a natural gas fuelled engine has been developed for future use. Natural gas fuelled vehicles are environmentally friendly and it is possible to use a high …
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Investigation of Binary Mixtures of N-Butanol and Biodiesel in Reactive Control Compression Ignition
… (DI) of biodiesel was compared with an in cylinder directly injected blend of n-butanol and biodiesel with the same mass ratio of n-butanol to biodiesel which change with respect to load. The combustion and emission characteristics were investigated at 2, 3, and 4 bar brake mean effective …
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Development of a quasi-dimensional diesel engine simulation for energy and availability analysis
… phenomena. The model shows that predicted cylinder pressure and heat release shape are in good agreement with experimental data under rated speed and load conditions. In the radiation heat transfer model, a modified two flux model is used to analyze penetration of radiation through …
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Research on late-robust combustion
… and relative air-fuel ratio set to 1.00. In-cylinder pressure measurements yielded COV of NIMEP and burn duration. Exhaust temperature was also recorded. The swirl jet improved COV of NIMEP a maximum of approximately 30% at each spark timing tested. The tumble jet improved COV a maximum of …
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