2014
DOI: 10.1016/j.enconman.2013.10.041
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Combined effects of cooled EGR and a higher geometric compression ratio on thermal efficiency improvement of a downsized boosted spark-ignition direct-injection engine

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Cited by 116 publications
(31 citation statements)
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“…[103,104] As aconsequence of the higher specific heat of CO 2 compared to O 2 ,E GR permits reduced combustion and end-gas peak temperatures.Moreover,cooled EGR minimizes the concentration of combustion-formed radicals in the cylinder charge and, thus,c ontributes to further reduce the knock and preignition tendency. [105][106][107][108] Even higher efficiencies can be achieved by de-throttling and reduced wall heat losses with lean-burn combustion concepts.L ean engine operation, on the one hand, is typically limited by reduced ignitability of the diluted air-fuel mixture.Onthe other hand, fuels with higher EGR compatibility and ignitability limits allow for increased mixture dilution and may,t herefore,a gain enable higher efficiency.B roadly speaking, these thermodynamic aspects, thus,p rofit highly from the choice of appropriate fuel properties.…”
Section: Future Combustion Enginesmentioning
confidence: 99%
“…[103,104] As aconsequence of the higher specific heat of CO 2 compared to O 2 ,E GR permits reduced combustion and end-gas peak temperatures.Moreover,cooled EGR minimizes the concentration of combustion-formed radicals in the cylinder charge and, thus,c ontributes to further reduce the knock and preignition tendency. [105][106][107][108] Even higher efficiencies can be achieved by de-throttling and reduced wall heat losses with lean-burn combustion concepts.L ean engine operation, on the one hand, is typically limited by reduced ignitability of the diluted air-fuel mixture.Onthe other hand, fuels with higher EGR compatibility and ignitability limits allow for increased mixture dilution and may,t herefore,a gain enable higher efficiency.B roadly speaking, these thermodynamic aspects, thus,p rofit highly from the choice of appropriate fuel properties.…”
Section: Future Combustion Enginesmentioning
confidence: 99%
“…Aufgrund der höheren spezifischen Wärmekapazität von CO 2 im Vergleich zu O 2 erlaubt die Abgasrückführung reduzierte Verbrennung und Endgasspitzentemperaturen. Zudem minimiert die gekühlte Abgasrückführung die Konzentration verbrennungsbedingter Radikale in der Zylinderfüllung und trägt so zu einer weiteren Verringerung des Klopf‐ und Vorentflammungsrisikos bei . Noch höhere Effizienz lässt sich über Entdrosselung und reduzierte Wandwärmeverluste mit mageren Verbrennungskonzepten erreichen.…”
Section: Biokraftstoffe – Antrieb Und Emissionenunclassified
“…To meet vehicle requirements for the maximum power output, intake boosting is generally necessary for downsized engines at high loads, causing knock a more severe problem compared http with their naturally aspirated (NA) counterparts. Strategies such as reduction in geometric compression ratio (CR), retardation in spark advance and fuel enriched operation are the most typical solutions to mitigate the knock problem in downsized SI engines at high loads, but a reduced fuel economy benefit from engine downsizing has to be compromised when using these anti-knock strategies [4]. With using numerical simulation, Boretti [5] demonstrated that up to 40% thermal efficiency could be achieved in the highly-boosted SI engine with the brake mean effective pressure (BMEP) exceeding 30 bar, while pure ethanol (E100) was used as the fuel instead of gasoline in the study.…”
Section: Introductionmentioning
confidence: 99%