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Full-Text Articles in Engineering
A Scr Model Based On Reactor And Engine Experimental Studies For A Cu-Zeolite Catalyst, Xiaobo Song
A Scr Model Based On Reactor And Engine Experimental Studies For A Cu-Zeolite Catalyst, Xiaobo Song
Dissertations, Master's Theses and Master's Reports - Open
A NOx reduction efficiency higher than 95% with NH3 slip less than 30 ppm is desirable for heavy-duty diesel (HDD) engines using selective catalytic reduction (SCR) systems to meet the US EPA 2010 NOx standard and the 2014-2018 fuel consumption regulation. The SCR performance needs to be improved through experimental and modeling studies. In this research, a high fidelity global kinetic 1-dimensional 2-site SCR model with mass transfer, heat transfer and global reaction mechanisms was developed for a Cu-zeolite catalyst. The model simulates the SCR performance for the engine exhaust conditions with NH3 maldistribution and aging …
Dynamic Model Based State Estimation In A Heavy Duty Diesel Aftertreatment System For Onboard Diagnostics And Controls, Harsha S. Surenahalli
Dynamic Model Based State Estimation In A Heavy Duty Diesel Aftertreatment System For Onboard Diagnostics And Controls, Harsha S. Surenahalli
Dissertations, Master's Theses and Master's Reports - Open
Estimating un-measurable states is an important component for onboard diagnostics (OBD) and control strategy development in diesel exhaust aftertreatment systems. This research focuses on the development of an Extended Kalman Filter (EKF) based state estimator for two of the main components in a diesel engine aftertreatment system: the Diesel Oxidation Catalyst (DOC) and the Selective Catalytic Reduction (SCR) catalyst. One of the key areas of interest is the performance of these estimators when the catalyzed particulate filter (CPF) is being actively regenerated.
In this study, model reduction techniques were developed and used to develop reduced order models from the 1D …
Development Of A 1-D Catalyzed Diesel Particulate Filter Model For Simulation Of The Performance And The Oxidation Of Particulate Matter And Nitrogen Oxides Using Passive Oxidation And Active Regeneration Engine Experimental Data, Kiran Premchand
Dissertations, Master's Theses and Master's Reports - Open
Back-pressure on a diesel engine equipped with an aftertreatment system is a function of the pressure drop across the individual components of the aftertreatment system, typically, a diesel oxidation catalyst (DOC), catalyzed particulate filter (CPF) and selective catalytic reduction (SCR) catalyst. Pressure drop across the CPF is a function of the mass flow rate and the temperature of the exhaust flowing through it as well as the mass of particulate matter (PM) retained in the substrate wall and the cake layer that forms on the substrate wall. Therefore, in order to control the back-pressure on the engine at low levels …