Project duration: 01.07.2019 - 31.03.2022
Contact IFS:
Chair in Automotive Powertrain Systems
Daniel Ismail Mir, M.Sc.
Project Partners:
RWTH Aachen, Institute for Combustion Engines (VKA)
Abstract:
Due to the large efficiency increase potential, homogeneous-lean SI-combustion processes are increasingly considered as technology for 2025+. Here, the reliable prediction of engine-out emissions plays an essential role. Due to the frequent engine starts with potentially cooled exhaust aftertreatment, eingine-out emissions are becoming more important even in strongly hybridized stoichiometric concepts. Especially in lean operation, the formation of NO in SI-engines highly depends on the degree of homogenization in the burned region. The CO emissions are also influenced by the local temperature. The main objective is therefore to extend the inhomogeneity model for the unburned mass, developed in the preliminary project, to the burned areas and thus to enable accurate NO and CO engine-out emissions prediction. The cyclical fluctuations of inhomogeneities as well as the NO- and CO-formation mechanisms are to be described exactly. The research project is of great economic importance, as the results are incorporated in engine design and development as well as the development of system components, simulation software, development tools and engine control systems of SMEs. In addition, the reliable simulation of homogeneous-lean SI-combustion processes will contribute to the fulfillment of legal requirements with regard to pollutant emissions and CO2 reduction. An industrial implementation is possible quickly and with little financial effort by standardized tools and the provision of an executable program (FVV cylinder module) as well as extensive documentation with accompanying training. As transfer measures, the publication of dissertations and the final report, the use of results in teaching and further education, lectures and presentations as well as a possible transfer of personnel to the industry ensure the long-term benefit of the project results even after completion of the project.
Focus: Modelling of the level of inhomogeneities and the formation of engine-out emissions in the burned mixture for homogeneous and in particular homogeneous-lean SI-engines.
Funding: BMWi/AiF - Federal Ministry for Economic Affairs and Energy / German Federation of Industrial Research Associations
For further information on the project, please also contact the Research Association for Combustion Engines (FVV).