Detailed Modeling of SI Engines in Fuel Consumption Simulations for Functional Analysis 1st Edition by Manuel Dorsch ISBN 3832542701 978-3832542702
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ISBN 10: 3832542701
ISBN 13: 978-3832542702
Author: Manuel Dorsch
The aim of this thesis is to establish a coupled modeling approach to simulate fuel consumption and in-cylinder gas emissions of a passenger car in various driving cycles (NEDC, RDE, WLTP). Combining models of the engine control unit and the mechanical vehicle powertrain with a crank-angle based combustion engine simulation opens up the possibility to support the development and calibration of future engines, demonstrated here for a turbo-charged spark ignited engine with direct injection and a fully-variable valvetrain. Thermodynamic processes are implemented within a 1D gas exchange model which allows to consider not only steady-state but also transient engine operation. The coupled system is extended by calculations of engine-out emissions considering the formation of nitrogen oxide (NOx), carbon monoxide (CO), and hydrocarbons (HC). Furthermore, tailpipe emissions are determined in an additional simulation model. The successful validation of this complex coupling technique is presented with exemplary results from all stages of the validation process. Finally, the advantage of this simulation methodology is shown by several application examples demonstrating the attained capabilities.
Table of contents:
1 INTRODUCTION
1.1 Motivation
1.2 State of the art technologies
1.3 State of the artemissions
1.4 State of the art control
2 SIMULATION METHODOLOGY
2.1 Virtual calibration: model of the ECU and driver actuation
2.1.1 Engine Control Unit
2.1.2 Driver actuation
2.2 Physical system: combustion engine and vehicle powertrain
2.2.1 Combustion engine model
2.2.2 Vehicle powertrain model
2.3 Simulation environment
2.4 Formation of in-cylinder and tailpipe emissions
2.4.1 In-cylinder NO emissions
2.4.2 In-cylinder CO emissions
2.4.3 In-cylinder HC emissions
2.4.4 Tailpipe emissions
3 MODELING
3.1 ECU model
3.2 Driver actuation
3.3 Engine model
3.3.1 Modeling
3.3.2 Model calibration.
3.4 Vehicle model
3.5 Coupled model
3.6 In-cylinder emissions
3.6.1 NO-and CO-model
3.6.2 Unburned hydrocarbon model
3.7 Tailpipe emissions
3.7.1 Numerical simulation
3.7.2 Simulation of the light-off behavior of three-way catalysts
3.7.3 Influence of aging.
3.7.4 Influence of precious metal loading
4 TRANSIENT SIMULATION
4.1 Measurements
4.2 Validation process
4.3 Proof of concept
4.3.1 ECU model
4.3.2 Engine model
4.3.3 Vehicle model
4.3.4 Coupled overall model
4.3.5 Emission models
4.3.6 Summary
5 APPLICATION EXAMPLES
5.1 Worldwide harmonized Light-Duty Test Procedure (WLTP)
5.2 Sensitivity of air-fuel ratio
5.3 Applications of crank angle based analyses
5.4 Transient simulation of tailpipe emissions
6 SUMMARY
BIBLIOGRAPHY
A APPENDIX
A.1 Further results of transient simulation
A.1.1 Transient validation of the engine stand-alone model
A.1.2 Transient validation of the driver control model in the coupled simulation
A.1.3 Transient validation of the engine model in the coupled simulation
A.2 Modeling approaches for three-way catalysts.
A.3 Chemical Reaction Mechanism for Tailpipe Emissions
A.4 Process scheme of the oxygen storage module
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Tags: Manuel Dorsch, Detailed Modeling, Engines in Fuel, Simulations for Functional