CTI Stuttgart May, 9th and 10th 2012
Dr.-Ing. Karl Wübbeke, Dipl.-Ing. (FH) Jessica Jasper
Overview of EGR Systems for Commercial Diesel Engines
Content
Emissions and Fuel Consumption: A Trade Off Conflict in Emissions Reduction
Strategies to lower Emissions in Engine Operation
Measurement and Control of Exhaust Gas Recirculation for Heavy Duty
Application
CTI Conference Stuttgart May 9th/10th 2012
Testing Specifications
Pierburg Product Development invirogated by Simulation Capabilities
Summary
www.kspg.com
© Pierburg 2012
2
Overview of EGR Systems for Commercial Diesel Engines
Systems Interaction in Emission Reduction for Commercial Diesel
Engines
0,15
Injection System
EU 2
Combustion System
Engine Control System en hm n a e m n ah ß ßn a
Ma M e ch e
BasicrisEngine
h o EU 3 ot c
DPF
rm ris e n in to
(OEM)
EU 3 o DPF m er n in
0,02
Turbo Charging
SCR
(OEM)
PM [g/kWh]
CTI Conference Stuttgart May 9th/10th 2012
0,10
EU 2
EU 5
0,01
EU 4
Exhaust Gas
Recirculation
EU 6
EU 5
EU 4
Diesel Particulate
Filter
NOX red.
0
EU 6 www.kspg.com 0,4
2,0
3,5
5,0
7,0
NOX red.
NOx [g/kWh]
© Pierburg 2012
3
Overview of EGR Systems for Commercial Diesel Engines
Exhaust Gas Recirculation as a Measure to reduce Emissions during the Combustion Process
Rich
CTI Conference Stuttgart May 9th/10th 2012
Lean
Akihama, SAE 2001 et. al.
EGR as added inert gas
²
Reduction of the peak combustion temperature
²
Lower NOx- production rates
EGR is limited due to combustion system and operation conditions like cold start, low ambient temperatures, engine temperature and torque demand www.kspg.com © Pierburg 2012
4
Overview of EGR Systems for Commercial Diesel Engines
Selective Catalytic Reduction (SCR) in order to reduce NOx to N2 and H2O
A SCR system needs