Assessment of risks for elevated NOx emissions of diesel vehicles outside the boundaries of RDE. Identifying relevant driving and vehicle conditions and possible abatement measures

With RDE (Real Driving Emissions) legislation a new chapter in emission testing has started for light-duty vehicles. RDE legislation poses new and more complex engineering targets for manufacturers. The expectation is that RDE will bring major improvements in the emission performance of LD vehicles for a large part of vehicle usage on European roads. However, a number of special, but not necessarily uncommon situations fall outside the boundaries for the test and vehicle conditions specified within the RDE legisla tion. If the effectiveness of emission control strategies would be focused on low emissions in normal use situations inside theRDE boundaries, elevated emissions due to different emission control strategies might occur in situations that are outside the scope of the RDE test conditions.