Transient EGR in a High-Speed DI Diesel Engine for a set of different EGR-routings
2010 (English)In: SAE International Journal of Engines, ISSN 1946-3936, Vol. 3, no 1, 1071-1078 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2010. Vol. 3, no 1, 1071-1078 p.
EGR, transient EGR
Mechanical Engineering Vehicle Engineering
IdentifiersURN: urn:nbn:se:kth:diva-71792DOI: 10.4271/2010-01-1271ScopusID: 2-s2.0-78649716726OAI: oai:DiVA.org:kth-71792DiVA: diva2:487094
QC 201201312012-01-312012-01-312014-04-11Bibliographically approved