Combustion characteristics of turbo charged DISI-engines
Henrik Hoffmeyer
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Henrik Hoffmeyer, Combustion characteristics of turbo charged DISI-engines (2012), Logos Verlag, Berlin, ISBN: 9783832596958
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Beschreibung / Abstract
In spite of progress in the development of alternative powertrain systems and energy sources, the internal combustion and all its derivates still are and will be the main powertrain for automobiles. In SI-engines, several approaches compete with each other like the controlled auto ignition (CAI or HCCI), throttle-free load control using variable valvetrains, stratified mixture formation with lean engine operation or highly turbo charged downsizing concepts all combined with gasoline direct injection. The presented work makes a contribution for a deeper understanding of the combustion process of a turbo charged direct injection engine operating with external EGR as well as lean stratified mixture. Using detailed test bench investigations and introducing a new optical measurement tool, the combustion process is described in detail focusing on the occurrence of non-premixed combustion phenomena. The influence of engine parameters like global and local air-/fuel ratio, external EGR and fuel rail pressure as well as the influence of fuel parameters are discussed giving a characterization of the combustion process of stratified engine operation. Furthermore, the influences of non-inert exhaust gas components on engine knock tendency are investigated using external EGR with an EGR catalyst. Opposing the results to numerical analysis, combustion characteristics of turbo charged DISI-engines are presented.
Inhaltsverzeichnis
- BEGINN
- 1 Introduction
- 1.1 The direct injection SI-engine
- 1.2 The turbo charged spray-guided combustion system
- 1.3 Conceptual formulation
- 2 Combustion and thermodynamics of turbo charged direct injection SI engines
- 2.1 Thermodynamic analysis of direct injection SI engines
- 2.2 Combustion of internal combustion engines
- 2.3 The spray-guided combustion process in direct injection SI engines
- 2.4 Soot formation, oxidation and emission
- 2.5 The optical determination of non-premixed flame temperature
- 2.6 Optical combustion characteristics of spray-guided stratified mixture formation
- 3 Study on combustion characteristics of turbo charged direct injection SI-engines
- 3.1 Combustion characteristics of spray-guided stratified mixture formation
- 3.2 The influence of EGR composition on engine knock
- 4 Conclusion and forecast
- 5 Nomenclature
- 6 References
- 7 Appendix
- 8 Table of Figures