The Path to a Negligible NO₂ Immission Contribution from the Diesel Powertrain

Authors

Dr.-Ing. A. Kufferath, Dr.-Ing. M. Krüger, Dipl.-Ing. D. Naber, Dipl.-Ing. E. Mailänder, Dr.-Ing. R. Maier, Robert Bosch GmbH, Stuttgart

Year

2018

Print Info

Fortschritt-Berichte VDI, Series 12, No 807

Summary

Euro 6d temp, the first stage of the regulatory package on real driving emissions (RDE), has become effective within the EU in September 2017; for the first time nitrogen oxide and particulate emissions of new car types have to be measured under real driving conditions. The second stage, Euro 6d final, will enter into effect on 1 January 2020. The resulting requirements in terms of vehicle weight, increased vehicle dynamics, a wide range of different ambient temperatures as well as uphill driving sections will contribute significantly to further reducing urban air pollution caused by car emissions. Due to the broad-based use of particulate filters in diesel vehicles, the development efforts will no longer focus on particulates but rather on a further reduction of nitrogen oxide emissions and the robust validation of a low level of emissions even under critical driving and ambient conditions. To achieve this aim, the optimum interaction between the combustion engine and the exhaust-gas after-treatment system as well as an efficient temperature management will be indispensable. The systematic implementation of these measures definitely does not conflict with the CO₂ benefit a diesel powertrain offers. Indepth testing on a demonstrator vehicle has proven that these initially conflicting targets can be reconciled. The emission results of these studies were used as input parameters for a simulation of immissions at the "Neckartor", a critical hot spot in Stuttgart. This paper will show that the thesis of a negligible contribution of the diesel powertrain to the NO₂ immissions can become reality even at critical hot spots.