Challenge RDE: Sustainable Diesel Exhaust Systems for Euro 6d

Authors

Wulf Hauptmann, Thomas Utschig, Benjamin Barth, Christian Tomanik, Ulrich Göbel, Ina Grisstede, Wilfried Müller,
Umicore AG & Co. KG, Hanau;
Johannes Hipp, Christian Beidl,
Technische Universität Darmstadt, Institute for Internal Combustion Engines and Powertrain Systems, Darmstadt

Summary

With the upcoming Euro 6d legislation, the requirements for Diesel aftertreatment systems are tightened significantly. The main driving force for this stricter regulation is the air quality in urban areas. Despite stricter legislative emission targets up to Euro 6b, the provisions on nitrogen oxides (NO_x) and fine particles (PM) are currently violated in several European cities. In the new Euro 6d regulation the validation of vehicle emissions under real driving conditions is mandatory from September 2017 onwards. With this change the variety of conditions, in which Diesel aftertreatment
systems have to operate at a high efficiency, is significantly increased.

In response to these new challenges, systems comprising of either a DOC or an actively operated NSC in combination with SDPF and/or SCR with urea dosing are being intensively investigated and will be presented. Consequently, these different Diesel aftertreatment concepts are evaluated under RDE test conditions. For that purpose, real drivin g patterns according to legal provisions were simulated on an Engine-in-the-Loop (EiL) testbed, which allows a precise back-to-back comparison of the particular catalyst systems. The emission results are broken down in detail with regards to the contribution of each system component and finally conclusions on potentials and limitations are drawn. This was done for a complete RDE trip and with a strong focus on urban RDE performance including cold start.

The results show that a combination of NSC and SDPF+SCR offers an excellent performance level over a broad engine operation window. In addition to optimizing the system configuration, the use of leading edge technologies is crucial. In this context, the latest catalyst development trends will be presented and discussed.

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