Effects of exhaust gas recycle in a downsized gasoline engine

Galloni, Enzo; Fontana, G.; Palmaccio, R.

doi:10.1016/j.apenergy.2012.12.046

Cited by 96 publications

(28 citation statements)

References 18 publications

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“…Test results showed the engine power level maintained without any necessary modifications when the n-butanol concentration was below 20%. Nowadays, engine downsizing coupled with turbocharging or supercharging has become one of the most effective technologies for reducing fuel consumption of SI engines [22]. However, with the increase of engine compression ratios and intake pressures, abnormal combustion of knock (knocking combustion) is more prone to occurring, especially in the region with low engine speed and high load.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the knocking combustion characteristics of n-butanol gasoline blends in a DISI engine

et al. 2016

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Section: Introductionmentioning

confidence: 99%

Experimental investigation on the knocking combustion characteristics of n-butanol gasoline blends in a DISI engine

et al. 2016

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“…This value is higher both for the raw charge mixture, and during combustion due to lower combustion temperature. Further to this, the elimination or reduction of knock tendency [16] may permit increased compression ratio, improving efficiency at all operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Improving gasoline direct injection (GDI) engine efficiency and emissions with hydrogen from exhaust gas fuel reforming

Fennell

Herreros

Tsolakis

2014

International Journal of Hydrogen Energy

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Graphical Abstract AbstractExhaust gas fuel reforming has been identified as a thermochemical energy recovery technology with potential to improve gasoline engine efficiency, and thereby reduce CO2 in addition to other gaseous and particulate matter (PM) emissions. The principle relies on achieving energy recovery from the hot exhaust stream by endothermic catalytic reforming of gasoline and a fraction of the engine exhaust gas. The hydrogen-rich reformate has higher enthalpy than the gasoline fed to the reformer and is recirculated to the intake manifold, i.e. reformed exhaust gas recirculation (REGR).The REGR system was simulated by supplying hydrogen and carbon monoxide (CO) into a conventional EGR system. The hydrogen and CO concentrations in the REGR stream were selected to be achievable in practice at typical gasoline exhaust temperatures. Emphasis was placed on comparing REGR to the baseline gasoline engine, and also to conventional EGR. The results demonstrate the potential of REGR to simultaneously increase thermal efficiency, reduce gaseous emissions and decrease PM formation.

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“…It is well proven that NOx formation at combustion temperatures beyond approximately 2100 °K will be accelerated significantly [1,19,20,29]. Accordingly, it can be inferred that the formation of NOx (variation of NOx) is directly proportional to the variation of T max [11,22,23,28,30]. Thus the magnitude of T max regulates the amount of NOx emission.…”

Section: Resultsmentioning

confidence: 99%

“…carbon dioxide CO 2 and water vapor H 2 O), the heat capacity of the cylinder charge becomes higher (Thermal Effect). The chemical reaction will increase due to the participation of some activated radical species (Chemical Effect) [9,27,[30][31][32][33]. Since all researches to date have focused on the effect of internal EGR rather than external EGR in terms of CAI two-stroke engines, this study aims at a new area of research, to examine the effect of external EGR compared with internal EGR changes on the exhaust emission characteristics of a two-stroke engine converted into CAI mode.…”

Section: Introductionmentioning

confidence: 99%

“…In order to achieve auto-ignition at the end of the compression stroke, the temperature of the charge at the beginning of the compression (T epc ) stroke should be sufficiently high [25][26][27][28][29]. Deployment of EGR results in a higher gas temperature throughout the compression process, which in turn speeds up the chemical reactions and eventually leads to the start of auto-ignition combustion of the homogeneously mixed fuel and air mixture [10,11,29,30]. These requirements can be realized whether using In-EGR or Ex-EGR.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Hot Burned Gas Utilization on the Exhaust Emission Characteristics of a Controlled Auto-Ignition Two-Stroke Cycle Engine

Andwari

Aziz²,

Said

et al. 2015

Int. J. Automot. Mech. Eng.

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A controlled auto-ignition (CAI) two-stroke cycle engine suggests an exceptional aspect and promising future for internal combustion engines (ICEs), such as a higher power-toweight ratio, higher combustion efficiency and lower exhaust gas emissions. Conventional two-stroke cycle engines emit higher exhaust gas emissions and offer lower fuel saving economy. Most of these drawbacks can be addressed if CAI combustion is associated with a two-stroke cycle engine. An experimental investigation is carried out based on a single-cylinder CAI two-stroke cycle engine using Internal and External Exhaust Gas Recirculation (In-EGR and Ex-EGR) and fuels with different octane numbers to investigate the exhaust emissions characteristics. The experimental results indicate a remarkable improvement in the engine's exhaust gas emissions. The concentration of uHC and CO emissions decreased with application of In/Ex-EGR. However, NOx emission increased with the use of In-EGR.

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Effects of exhaust gas recycle in a downsized gasoline engine

Cited by 96 publications

References 18 publications

Experimental investigation on the knocking combustion characteristics of n-butanol gasoline blends in a DISI engine

Experimental investigation on the knocking combustion characteristics of n-butanol gasoline blends in a DISI engine

Improving gasoline direct injection (GDI) engine efficiency and emissions with hydrogen from exhaust gas fuel reforming

Influence of Hot Burned Gas Utilization on the Exhaust Emission Characteristics of a Controlled Auto-Ignition Two-Stroke Cycle Engine

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