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Physics Based Diesel Engine Model Development Calibration And Validation For Accurate Cylinder Parameters And Nox Prediction
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Book Synopsis Physics-based Diesel Engine Model Development, Calibration and Validation for Accurate Cylinder Parameters and Nox Prediction by : Vaibhav Kailas Ahire
Download or read book Physics-based Diesel Engine Model Development, Calibration and Validation for Accurate Cylinder Parameters and Nox Prediction written by Vaibhav Kailas Ahire and published by . This book was released on 2021 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stringent regulatory requirements and modern diesel engine technologies have engaged automotive manufacturers and researchers in accurately predicting and controlling diesel engine-out emissions. As a result, engine control systems have become more complex and opaquer, increasing the development time and costs. To address this challenge, Model-based control methods are an effective way to deal with the criticality of the system study and controls. And physics-based combustion engine modeling is a key to achieve it. This thesis focuses on development and validation of a physics-based model for both engine and emissions using model-based design tools from MATLAB & Simulink. Engine model equipped with exhaust gas circulation and variable geometry turbine is adopted from the previously done work which was then integrated with the combustion and emission model that predicts the heat release rates and NOx emission from engine. Combustion model is designed based on the mass fraction burnt from CA10 to CA90 and then NOx predicted using the extended Zeldovich mechanism. The engine models are tuned for both steady state and dynamics test points to account for engine operating range from the performance data. Various engine and combustion parameters are estimated using parameter estimation toolbox from MATLAB and Simulink by applying the least squared solver to minimize the error between measured and estimated variables. This model is validated against the virtual engine model developed in GT-power for Cummins 6.7L turbo diesel engine. To account for the harmonization of the testing cycles to save engine development time globally, a world harmonized stationary cycle (WHSC) is used for the validation. Sub-systems are validated individually as well as in a loop with a complete model for WHSC. Engine model validation showed promising accuracy of more than 88.4 percent on average for the desired parameters required for the NOx prediction. NOx estimation is accurate for the cycle except the warm-up and cool-down phase. However, NOx prediction during these phases is limited due to actual NOx measured data for tuning the model for real-time NOx estimation. Results are summarized at the end to compare the trend of NOx estimation from the developed combustion and emission model to show the accuracy of in-cylinder parameters and required for the NOx estimation.
Book Synopsis Multi-physics Engine Simulation Framework for Drive Cycle Emissions Prediction. Development and Validation of a Framework for Transient Drive Cycle NOx Prediction Modelling Based on Combining 1-D and 0-D Internal Combustion Engine Simulation and Statistical Meta-modelling by : Aleksandrs Korsunovs
Download or read book Multi-physics Engine Simulation Framework for Drive Cycle Emissions Prediction. Development and Validation of a Framework for Transient Drive Cycle NOx Prediction Modelling Based on Combining 1-D and 0-D Internal Combustion Engine Simulation and Statistical Meta-modelling written by Aleksandrs Korsunovs and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Optimization Methods for the Mixture Formation and Combustion Process in Diesel Engines by : Jost Weber
Download or read book Optimization Methods for the Mixture Formation and Combustion Process in Diesel Engines written by Jost Weber and published by Cuvillier Verlag. This book was released on 2008 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modelling Diesel Combustion by : P. A. Lakshminarayanan
Download or read book Modelling Diesel Combustion written by P. A. Lakshminarayanan and published by Springer. This book was released on 2010-10-24 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phenomenology of Diesel Combustion and Modeling Diesel is the most efficient combustion engine today and it plays an important role in transport of goods and passengers on land and on high seas. The emissions must be controlled as stipulated by the society without sacrificing the legendary fuel economy of the diesel engines. These important drivers caused innovations in diesel engineering like re-entrant combustion chambers in the piston, lower swirl support and high pressure injection, in turn reducing the ignition delay and hence the nitric oxides. The limits on emissions are being continually reduced. The- fore, the required accuracy of the models to predict the emissions and efficiency of the engines is high. The phenomenological combustion models based on physical and chemical description of the processes in the engine are practical to describe diesel engine combustion and to carry out parametric studies. This is because the injection process, which can be relatively well predicted, has the dominant effect on mixture formation and subsequent course of combustion. The need for improving these models by incorporating new developments in engine designs is explained in Chapter 2. With “model based control programs” used in the Electronic Control Units of the engines, phenomenological models are assuming more importance now because the detailed CFD based models are too slow to be handled by the Electronic Control Units. Experimental work is necessary to develop the basic understanding of the pr- esses.
Book Synopsis A Quasi-dimensional Charge Motion and Turbulence Model for Combustion and Emissions Prediction in Diesel Engines with a fully Variable Valve Train by : Qirui Yang
Download or read book A Quasi-dimensional Charge Motion and Turbulence Model for Combustion and Emissions Prediction in Diesel Engines with a fully Variable Valve Train written by Qirui Yang and published by Springer Nature. This book was released on 2021-10-01 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: Qirui Yang develops a model chain for the simulation of combustion and emissions of diesel engine with fully variable valve train (VVT) based on extensive 3D-CFD simulations, and experimental measurements on the engine test bench. The focus of the work is the development of a quasi-dimensional (QDM) flow model, which sets up a series of sub-models to describe phenomenologically the swirl, squish and axial charge motions as well as the shear-related turbulence production and dissipation. The QDM flow model is coupled with a QDM combustion model and a nitrogen oxides (NOx) / soot emission model. With the established model chain, VVT operating strategies of diesel engine can be developed and optimized as part of the simulation for specific engine performance parameters and the lowest NOx and soot emissions.
Book Synopsis A Computational Investigation of Diesel and Biodiesel Combustion and NOx Formation in a Light-duty Compression Ignition Engine by :
Download or read book A Computational Investigation of Diesel and Biodiesel Combustion and NOx Formation in a Light-duty Compression Ignition Engine written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Diesel and biodiesel combustion in a multi-cylinder light duty diesel engine were simulated during a closed cycle (from IVC to EVO), using a commercial computational fluid dynamics (CFD) code, CONVERGE, coupled with detailed chemical kinetics. The computational domain was constructed based on engine geometry and compression ratio measurements. A skeletal n-heptane-based diesel mechanism developed by researchers at Chalmers University of Technology and a reduced biodiesel mechanism derived and validated by Luo and co-workers were applied to model the combustion chemistry. The biodiesel mechanism contains 89 species and 364 reactions and uses methyl decanoate, methyl-9- decenoate, and n-heptane as the surrogate fuel mixture. The Kelvin-Helmholtz and Rayleigh-Taylor (KH-RT) spray breakup model for diesel and biodiesel was calibrated to account for the differences in physical properties of the fuels which result in variations in atomization and spray development characteristics. The simulations were able to capture the experimentally observed pressure and apparent heat release rate trends for both the fuels over a range of engine loads (BMEPs from 2.5 to 10 bar) and fuel injection timings (from 0° BTDC to 10° BTDC), thus validating the overall modeling approach as well as the chemical kinetic models of diesel and biodiesel surrogates. Moreover, quantitative NOx predictions for diesel combustion and qualitative NOx predictions for biodiesel combustion were obtained with the CFD simulations and the in-cylinder temperature trends were correlated to the NOx trends.
Book Synopsis Modelling and Observation of Exhaust Gas Concentrations for Diesel Engine Control by : Dr.-Ing. David Blanco-Rodriguez
Download or read book Modelling and Observation of Exhaust Gas Concentrations for Diesel Engine Control written by Dr.-Ing. David Blanco-Rodriguez and published by Springer. This book was released on 2014-05-19 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents a complete new methodology for the on-board measurements and modeling of gas concentrations in turbocharged diesel engines. It provides the readers with a comprehensive review of the state-of-art in NOx and lambda estimation and describes new important achievements accomplished by the author. These include: the online characterization of lambda and NOx sensors; the development of control-oriented models of lambda and NOx emissions; the design of computationally efficient updating algorithms; and, finally, the application and evaluation of the methods on-board. Because of its technically oriented approach and innovative findings on both control-oriented algorithms and virtual sensing and observation, this book offers a practice-oriented guide for students, researchers and professionals working in the field of control and information engineering.
Book Synopsis Development of a Partially Premixed Combustion Model for a Diesel Engine Using Multiple Injection Strategies by : Rene Thygesen
Download or read book Development of a Partially Premixed Combustion Model for a Diesel Engine Using Multiple Injection Strategies written by Rene Thygesen and published by Logos Verlag Berlin GmbH. This book was released on 2012 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to fulfil future emissions legislations, new combustion systems are to be investigated. One way of improving exhaust emissions is the application of multiple injection strategies and conventional or partially premixed combustion conditions to a Diesel engine. The application of numerical techniques as CFD supports and improves the quality of engine developments. Unfortunately, current spray and combustion models are not accurate enough to simulate multiple injection systems, being in this way a topic of research. The goal of this study was the development of a novel simulation method for the investigation of Diesel engines operated with multiple injection strategies and different combustion modes. The first part of this work focused in improving the spray modelling. The inform ation of 3D CFD simulations of the injector nozzle was introduced in the spray simulation as boundary conditions developing coupling subroutines for this issue. The atomisation modelling was also improved using validated presumed droplet size distributions. Moreover, to avoid the simulation of the injector nozzle for every investigated operating point, a novel interpolating tool was developed in order to create spray boundary conditions based on few 3D CFD simulations of the nozzle under certain initial and boundary conditions. The second part of this thesis dealt with the combustion modelling of Diesel engines. For this issue, a laminar flamelet approach called Representative Interactive Flamelet model (RIF) was selected and implemented. Afterwards, an extended combustion model based on RIF was developed in order to take into account multiple injection strategies. Finally, this new model was validated with a wide range of operating points: applying multiple injection strategies under conventional and partially premixed combustion conditions.
Book Synopsis Development and Calibration of a Torsional Engine Model for a Three- Cylinder, Two-Stroke Diesel Engine by : James W. Hudson
Download or read book Development and Calibration of a Torsional Engine Model for a Three- Cylinder, Two-Stroke Diesel Engine written by James W. Hudson and published by . This book was released on 1997-12-01 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental and analytical investigation was conducted to develop a calibrated torsional model of a three-cylinder, two-stroke diesel engine. A detroit Diesel 3-53 engine was instrumented for time resolved measurement of cylinder firing pressures and high resolution near instantaneous shaft speed using a 720 and a 3,600 count per revolution optical encoder. Data were taken for three spes and three torques for a total of nine conditions. A six degree- of-freedom torsional vibration model of the crankshaft, connecting rods, and pistons was developed. The nonlinear inertias, due to the reciprocating pistons, were included along with linear stiffness and damping. The equations of motion were numerically integrated over a cycle to obtain predicted response. The predicted response was compared to the measured response at the free end of the crankshaft.
Book Synopsis Thermo- and Fluid Dynamic Processes in Diesel Engines 2 by : James H. Whitelaw
Download or read book Thermo- and Fluid Dynamic Processes in Diesel Engines 2 written by James H. Whitelaw and published by Springer Science & Business Media. This book was released on 2004-01-23 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers collected in this volume address all aspects related to thermofluidynamic processses in Diesel engines, from basic studies aiming to obtain a better understanding of the physical processes underlying diesel engine operation, to the real day-to-day problems associated with engine development. The topics covered comprise: Air management, injection systems, spray development and air interaction, combustion and pollutant formation, emission control strategies, and new concepts.
Book Synopsis Future Powertrain Technologies by : Stephan Rinderknecht
Download or read book Future Powertrain Technologies written by Stephan Rinderknecht and published by MDPI. This book was released on 2020-12-17 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Among the various factors greatly influencing the development process of future powertrain technologies, the trends in climate change and digitalization are of huge public interest. To handle these trends, new disruptive technologies are integrated into the development process. They open up space for diverse research which is distributed over the entire vehicle design process. This book contains recent research articles which incorporate results for selecting and designing powertrain topology in consideration of the vehicle operating strategy as well as results for handling the reliability of new powertrain components. The field of investigation spans from the identification of ecologically optimal transformation of the existent vehicle fleet to the development of machine learning-based operating strategies and the comparison of complex hybrid electric vehicle topologies to reduce CO2 emissions.
Book Synopsis Model Assisted Iterative Calibration of Internal Combustion Engines by : Anuj Pal
Download or read book Model Assisted Iterative Calibration of Internal Combustion Engines written by Anuj Pal and published by . This book was released on 2021 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent automotive technological advancements mainly focus on improving fuel economy with satisfactory emission levels, leading to a significant increment of engine system complexity, especially diesel engines. This increases the number of engine control parameters, making the engine calibration process challenging and time-consuming using the conventional map-based approach. Note that engine calibration is a crucial step in achieving optimal engine performance with satisfactory emissions, and it is an expensive process in general. With the advancement and widespread adoption of machine learning methods for control applications, it is now possible to use a black-box model with intelligence to efficiently calibrate nonlinear systems without detailed knowledge of system dynamics. The surrogate-assisted optimization approach is an attractive way to reduce the total computational budget for obtaining optimal solutions. This makes it special for its application to practical optimization problems requiring a large number of expensive evaluations.The current research work focuses on the problem of performing engine calibration using the surrogate-assisted optimization approach. The objective is to find the trade-off curve between engine efficiency in terms of brake specific fuel consumption (BSFC) and its NOx emissions by efficiently optimizing various control parameters. The complete study is divided into three parts. The first part deals with modifying the original algorithm for efficiently handling the practical system with measurement noise. A new constrained handling algorithm is proposed for lower confidence bound (LCB) criteria that showed good performance for both deterministic and stochastic systems. Furthermore, two extensions based on the expected improvement (EI) criterion are proposed for handling stochastic multi-objective problems.After the methodology development for handling stochastic systems, the second part validates their efficacy for performing the engine calibration in a simulation setting. All three algorithms are compared to identify the best approach for its implementation on the actual engine experimental setup. Three control parameters, namely variable geometry turbocharger (VGT) vane position, exhaust-gas-recirculating (EGR) valve position, and the start of injection (SOI), are calibrated to obtain the trade-off between engine fuel efficiency performance (BSFC) and NOx emissions within the constrained design space. The simulation study identifies the lower confidence bound (LCB) criteria with the proposed constraint handling approach to work well in the stochastic setting, compared with the other two extensions. Therefore, this approach is used for the experimental evaluation of the proposed surrogate-assisted optimization for engine calibration.Finally, the third part is the experimental validation. It is the first step towards automating the entire engine calibration process. Experimental evaluations are performed on a 6.7L Ford diesel engine to validate the algorithm's efficacy. Problems with different complexity are formulated and evaluated using the proposed approach. Initially, a simpler problem with two control variables is formulated to get the confidence to perform the experiments using the proposed algorithm. Two variables: EGR valve position and VGT vane positions, are calibrated to obtain a trade-off between engine efficiency (BSFC) and NOx emissions. After observing promising results, the study is concluded with a more complicated three control variable problem. An external electrically assisted boosting device (eBoost) is added to the engine system to perform calibration. Results showed improved engine performance using the eBoost with a significant reduction in calibration effort in terms of the number of experimental evaluations. The study successfully demonstrated the application of the surrogate-assisted optimization approach to a practical engine system and opened the door to automate the engine calibration process with reduced calibration efforts.
Book Synopsis Annual Index/abstracts of SAE Technical Papers by :
Download or read book Annual Index/abstracts of SAE Technical Papers written by and published by . This book was released on 2006 with total page 1000 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Theoretical and Experimental Study of Emissions Modeling for Diesel Engines with Comparisons to In-cylinder Imaging by : Gregory James Hampson
Download or read book A Theoretical and Experimental Study of Emissions Modeling for Diesel Engines with Comparisons to In-cylinder Imaging written by Gregory James Hampson and published by . This book was released on 1997 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt: Typescript.
Book Synopsis Development and Validation of a New Zero-Dimensional Semi-Physical NOx Emission Model for a D.I. Diesel Engine Using Simulated Combustion Process by : Hassan Karaky
Download or read book Development and Validation of a New Zero-Dimensional Semi-Physical NOx Emission Model for a D.I. Diesel Engine Using Simulated Combustion Process written by Hassan Karaky and published by . This book was released on 2015 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Introduction to Modeling and Control of Internal Combustion Engine Systems by : Lino Guzzella
Download or read book Introduction to Modeling and Control of Internal Combustion Engine Systems written by Lino Guzzella and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt: Internal combustion engines still have a potential for substantial improvements, particularly with regard to fuel efficiency and environmental compatibility. These goals can be achieved with help of control systems. Modeling and Control of Internal Combustion Engines (ICE) addresses these issues by offering an introduction to cost-effective model-based control system design for ICE. The primary emphasis is put on the ICE and its auxiliary devices. Mathematical models for these processes are developed in the text and selected feedforward and feedback control problems are discussed. The appendix contains a summary of the most important controller analysis and design methods, and a case study that analyzes a simplified idle-speed control problem. The book is written for students interested in the design of classical and novel ICE control systems.
Book Synopsis Development of New Diesel Engines and Components Design by : Society of Automotive Engineers
Download or read book Development of New Diesel Engines and Components Design written by Society of Automotive Engineers and published by SAE International. This book was released on 1997 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
