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Enabling Hcci Combustion Of N-Heptane Through Thermo-Chemical Recuperation, Francisco Posada Sanchez
Enabling Hcci Combustion Of N-Heptane Through Thermo-Chemical Recuperation, Francisco Posada Sanchez
Graduate Theses, Dissertations, and Problem Reports
Concerns over air quality, environmental regulatory requirements and the need for reducing fuel consumption on conventional internal combustion engines (ICE) have motivated the development of alternative combustion processes for ICE. One alternative, homogeneous charge compression ignition (HCCI), has shown benefits of high efficiency with low NOx emissions, but suffers load range limitations and control issues. An increase in equivalence ratio at constant speed changes the combustion timing relative to top dead center (TDC), and also increases the pressure rise rate. The opposite occurs if the equivalence ratio is reduced, delaying the combustion timing with respect to TDC and reducing the …
Optimization Of A Heavy-Duty Hybrid Transit Bus Operated Over Transient Cycles, Pingen Chen
Optimization Of A Heavy-Duty Hybrid Transit Bus Operated Over Transient Cycles, Pingen Chen
Graduate Theses, Dissertations, and Problem Reports
This thesis centers on the simulation and optimization of a hybrid transit bus when operated over transient emissions cycles. The simulation was conducted using Powertrain System Analysis Toolkit (PSAT) as a platform by integrating components' data and operation maps of a "pre-transmission" parallel hybrid transit bus. The model was validated against the limited experimental data when operated over the China's Urban Bus (CUB) driving cycle and the Beijing cycle. The validated model was then used to predict the performance and exhaust emissions of this hybrid bus operated over typical U.S. cycles. The potential of a real-time control strategy in improving …
Small Engine Emissions Testing Laboratory Development And Emissions Sampling System Verification, Balaji B. Seward
Small Engine Emissions Testing Laboratory Development And Emissions Sampling System Verification, Balaji B. Seward
Graduate Theses, Dissertations, and Problem Reports
With the recent scrutiny of engine emissions and a focus towards higher fuel efficiencies, there has been an increase in demand for small, efficient engines and small engine emissions testing. Small engines have proven to provide high efficiency performance for systems including refrigeration units, generators, compressors and numerous other off-road applications. In the past, the existing emissions testing facilities at West Virginia University's (WVU) Center for Alternative Fuels, Engines and Emissions (CAFEE) have been focused towards the testing of heavy duty diesel engines.;In order to expand the emissions testing capabilities at CAFEE, a new small engine emissions testing laboratory was …