Analysis of different exhaust gas recirculation architectures for passenger car Diesel engines

Different Exhaust Gas Recirculation (EGR) system architectures have been evaluated by means of both experimental tests and numerical simulation; in addition to the experimental tests, a one-dimensional fluid-dynamic engine model has been built in order to assess the potential of a Dual Loop (DL) EGR system – a combination of Short Route (SR) and Long Route (LR) EGR systems. Substantial reductions of the NOx emissions have been achieved using the LR EGR layout both under steady state and transient operating conditions: a reduction of up to 15% over the first 60s of the Extra Urban Driving Cycle (EUDC) was obtained with the LR layout. An optimal combination of LR and SR has led to a further reduction of 5% of the nitrogen oxide emissions, due to a faster response of the EGR system during transients. Finally some fundamental knowledge that can be used to control the EGR flow rate more accurately has been gathered, by means of the numerical simulation, especially for the Dual Loop EGR system layout.

[1]  J. Macek,et al.  Comparison of Different EGR Solutions , 2008 .

[2]  Victor Gheorghiu,et al.  System Structure and Controller Concept for an Advanced Turbocharger/EGR System for a Turbocharged Passenger Car Diesel Engine , 2005 .

[3]  Hua Zhao,et al.  The Dilution, Chemical, and Thermal Effects of Exhaust Gas Recirculation on Diesel Engine Emissions - Part 1: Effect of Reducing Inlet Charge Oxygen , 1996 .

[4]  John E. Dec,et al.  The Effects of Injection Timing and Diluent Addition on Late-Combustion Soot Burnout in a Di Diese , 2000 .

[5]  Federico Millo,et al.  Analysis of Different Internal EGR Solutions for Small Diesel Engines , 2007 .

[6]  Federico Millo,et al.  An experimental investigation on OBD II techniques for fuel injection system monitoring in a common rail passenger car diesel engine , 2009 .

[7]  Hua Zhao,et al.  The Dilution, Chemical, and Thermal Effects of Exhaust Gas Recirculation on Disesel Engine Emissions - Part 4: Effects of Carbon Dioxide and Water Vapour , 1997 .

[8]  Xavier Tauzia,et al.  Influence of EGR unequal distribution from cylinder to cylinder on NOx–PM trade-off of a HSDI automotive Diesel engine , 2009 .

[9]  Federico Millo,et al.  An experimental and numerical study of an advanced EGR control system for automotive diesel engine , 2008 .

[10]  T. Johnson.  Diesel Emission Control in Review , 2001 .

[11]  Hua Zhao,et al.  The Dilution, Chemical, and Thermal Effects of Exhaust Gas Recirculation on Diesel Engine Emissions - Part 3: Effects of Water Vapour , 1996 .

[12]  Brian Cooper,et al.  Advanced Diesel Technology to Achieve Tier 2 Bin 5 Emissions Compliance in US Light-Duty Diesel Applications , 2006 .

[13]  Rifat Keribar,et al.  Engine/Powertrain/Vehicle Modeling Tool Applicable to All Stages of the Design Process , 2000 .

[14]  C. Westbrook,et al.  Diesel combustion: an integrated view combining laser diagnostics, chemical kinetics, and empirical validation , 1999 .

[15]  Rifat Keribar,et al.  “Virtual Engine/Powertrain/Vehicle” Simulation Tool Solves Complex Interacting System Issues , 2003 .

[16]  N Ladommatos,et al.  The dilution, chemical, and thermal effects of exhaust gas recirculation on diesel engine emissions-part 2: Effects of carbon dioxide , 1996 .

[17]  Friedrich Wirbeleit,et al.  The Potential of a Combined Miller Cycle and Internal EGR Engine for Future Heavy Duty Truck Applications , 1998 .