New Approaches and Development Methods to Minimize NO_x - Emissions of Diesel Engines

摘要

A more and more restrictive emission legislation for Diesel engines will require a significant decrease of nitric oxide (NO_x) emissions for Diesel powered vehicles in the future. At the Institute for Powertrains and Automotive Technology (IFA) of the Vienna University of Technology various methods are being investigated that have the potential to enable the required improvements. For the Selective Catalytic Reduction an optimal preparation of ammonium in the exhaust system is a significant criteria for an efficient decrease of NO_x emissions. Investigations were carried out with most recent measurement techniques, i.e. spray analyses with laser diffraction, wall wetting with infrared thermal imaging and the uniformity with FTIR-spectroscopy. Parallel the ammonia preparation was predicted by means of numerical CFD-simulations. The hybridization of powertrains with Diesel engines offers promising approaches to avoid nitric oxide raw emissions, too. At the IFA specific hybrid operation strategies were developed and optimized by means of modular vehicle simulation models. Afterwards, the simulation results were verified in a hardware-in-the-loop environment that was established on a highly dynamic engine test bench. Thereby, the engine hardware is implemented in the real-time simulation model of the remaining vehicle.