NOₓ-free Exhaust Gas – AdBlue Dosing Is the Key

Authors

Dipl.-Ing. (FH) R. Brück, Dipl.-Ing. T. Cartus,
Dipl.-Ing. (FH) K. Müller-Haas,
Dr. rer. nat. Dipl.-Phys. A. Schatz,
Dipl.-Ing. N. Zaldua-Moreno,
Dipl.-Ing. M. Karibayev, Continental Emitec, Lohmar

Year

2015

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 783

Summary

Exhaust emissions from diesel engines in automotive applications have been dramatically reduced in the new millennium. The hydrocarbon, carbon monoxide and particle concentrations emitted by EURO 6/VI diesel engines are in some cases lower than those in the ambient air, which means that, in terms of these emissions, the engines do not pollute the environment. Unfortunately, the same cannot yet be said for nitrogen oxide (NOx) emissions. A comparison between the European air quality immission limit for NO2 (40μg/m3) and the Euro 6/VI limits for NOx would reveal that the exhaust gas of EURO VI/6 engines is allowed to contain approximately 3 orders of magnitude higher NOx concentrations. The US, specifically California, is taking one step further with another 90% reduction in NOx limits through the introduction of SULEV legislation and the current debate on limits for commercial vehicles in California from 2020. As a result, the development of future emission control will shift its focus toward NOx reduction, which must go hand in hand with the requirement for further reductions in CO₂ emissions, fuel consumption and system costs. As a key technology for NOx reduction, SCR will have to be integrated in future powertrains in such a way as to reduce NOx emissions by ≥98% in a wide engine map range without increasing fuel consumption.