Challenges for the Future Diesel Engines Exhaust Gas Aftertreatment System 2007-01-0040
The reduction of diesel emissions will remain a major challenge in the near future. Based on the expected emissions legislation for Europe and NAFTA, respectively, two main routes to approach this challenge are possible.
Especially for the NAFTA market the use of a NOx emission control system is highly probable due to the established low limit for NOx emissions. From today's point of view only two systems - the NOx storage catalyst and the SCR catalyst system - have the potential to reach these limits. In Europe the expected Euro5 NOx limit can most likely be reached by engine measures only.
Nevertheless both markets have the common understanding that besides the further improvement by internal engine measures the diesel oxidation catalyst (DOC) as well as the catalysed diesel particulate (DPF) filter will play an essential role in diesel emissions reduction.
This publication will show the requirements for the DOC and the catalysed DPF in order to fulfil the future emissions legislation and discuss some approaches on how to deal with these requirements. For this purpose the results of several investigations from model gas testing, engine bench as well as vehicle evaluation will be presented and discussed.