Zlojo, Harun ; Kuznik, Alexander ; Beidl, Christian (2018)
2025+ Requirements on Emission Control - Provide future framework (chemical/ thermohydraulic) for the design of future emission control systems in drivetrains 2025+.
Report, Bibliographie

Kurzbeschreibung (Abstract)

This research project’s objective is to describe and quantify the boundary conditions and resulting future challenges for the emission control system. Six different combinations of powertrains and vehicles were defined based on a future scenario in 2025 considering legislative,social, and technological developments and impacts. The investigations were realized by using a complex simulation which allows to simulate all kinds of powertrain systems under real driv- ing conditions. The focus is on the engine out raw emissions, the exhaust gas temperatures and massflow profiles to quantitatively describe the future boundary conditions of aftertreatment systems. The legislative assumptions are based on the expectation of tightening the fuel consumption and emission limits while using the real driving emissions (RDE) procedure for the certification of vehicles. Although the current development shows a fleet decrease of the diesel fleet mix percentage and an increase in the SUVs percentage, the technological scenario is mainly driven by technologies to reduce fuel consumption and emissions. Hybridization and alternative fuels are promising in this context.The six powertrains represent a mix of different combustion engines powered by diesel, gasoline or compressed natural gas (CNG) in combination with variable degrees of hybridization, using P0 and P2 configuration as well as a plug-in hybrid electric vehicle structure (PHEV). The considered vehicle range spreads from small cars to executive SUVs. The aforementioned RDE routes, on which the investigations are based on, were generated with the help of a tool which was developed at the Institute of Internal Combustion Engines and Powertrain Systems (VKM) of the TU Darmstadt. These were four routes which differ in respect of driving profile and boundary conditions. Two routes satisfy the RDE boundary conditions, whereas two other ones exceed them in order to explore emission challenges outside of today’s RDE boundary conditions. The virtual RDE assessment allows to identify the general powertrain behavior in regard of exhaust gas temperatures and massflow as well as the pollutant emissions. Based on the virtual RDE maneuvers, it is possible to identify critical driving maneuvers in regard of emissions and quantify them to give the base information to develop future solutions of emission control system’s pollutants reduction requirements.

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