Effects of cooled EGR routing on a second-generation DISI turbocharged engine employing an integrated exhaust manifold

J. W G Turner, R. J. Pearson, R. Curtis, B. Holland

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Citations (Scopus)

Abstract

The work reports results from tests employing different cooled EGR routes on a 'Sabre' direct-injection spark-ignition (DISI) research engine. As standard, this engine has been configured to provide good fuel consumption from a combination of mild downsizing, a combustion system with close-spaced injection and the adoption of a three-cylinder configuration in concert with an exhaust manifold integrated into the cylinder head. This has already been shown to offer a rated power specific fuel consumption of 272 g/kWh without cooled EGR. Three different EGR configurations are tested, with the best BSFC at nominal rated conditions being found to be 257-258 g/kWh at a cooled EGR rate of 6%. All of the EGR routing configurations tested in this work permit ready operation of the engine at Lambda 1 and MBT conditions, however, the results show little sensitivity in the combustion system to the actual routing employed. With all of the tested configurations there is a trade-off in terms of the effect on the charging system and also combustion stability. This suggests that other technologies, such as a variable geometry turbocharger or a two-stage charging system, may be more beneficial on this engine configuration than cooled EGR when it is considered as an entire system.

Original languageEnglish
Title of host publicationSAE Technical Papers
DOIs
Publication statusPublished - 1 Dec 2009
EventSAE 2009 World Congress - Detroit, Michigan, USA United States
Duration: 20 Apr 200923 Apr 2009

Conference

ConferenceSAE 2009 World Congress
CountryUSA United States
CityDetroit, Michigan
Period20/04/0923/04/09

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