Transient EGR in a High-Speed DI Diesel Engine for a set of different EGR-routings

Paper #:
  • 2010-01-1271

Published:
  • 2010-04-12
Citation:
Reifarth, S. and Angstrom, H., "Transient EGR in a High-Speed DI Diesel Engine for a set of different EGR-routings," SAE Int. J. Engines 3(1):1071-1078, 2010, https://doi.org/10.4271/2010-01-1271.
Pages:
8
Abstract:
EGR has been proven to reduce NOx emissions from diesel engines significantly and is nowadays widely used in production engines. To reach future emission legislation standards, alternative EGR-routings that deliver higher EGR-rates get into the focus of researchers. As the steady-state emissions are reduced more and more, the emission peaks in transient parts of driving cycles gain importance. Therefore it is interesting to analyze the transient behavior of different EGR-routings.In this work, a 1-D simulation is performed in GT-Power for a 1.9 liter passenger car diesel engine equipped with cooled short-route EGR and a variable geometry turbine. For calibration of the simulation, load transients are measured including the measurement of transient EGR-rates using a fast CO2-analyzer and cylinder pressure to obtain heat-release data. A database with heat-release rates for transient combustion is collected to enable the simulation to run with real combustion data at all points of the transients. The transient EGR-rate as well as the intake pressure are used as criteria to chose the right heat-release rate for a certain cycle.A set of different ways of supplying EGR, namely hybrid EGR, pump-assisted EGR and a reed valve in the EGR-circuit are then implemented in the simulation software and analyzed with respect to transient response and fuel consumption. Another aspect of the analysis is the possibility to control the EGR-rate during the transient. This includes positive load transients with EGR-shutoff as well as negative load transients with need for fast EGR-delivery.
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