Split-Injection in a Downsized Ethanol SIDI Engine Aiming to Mitigate Pre-Ignition

Silva, Thiago Rodrigo Vieira da; Baêta, José Guilherme Coelho; Neto, Nilton A. D.; Malaquias, Augusto César Teixeira; Carvalho, Matheus G. F.; Filho, Fernando R.

doi:10.4271/2017-36-0266

Cited by 12 publications

(9 citation statements)

References 19 publications

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“…A late split injection strategy was suggested by [32]. The authors reported pre-ignition free operation at an IMEP of 22.7 bar while using ethanol as a fuel.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Different Fluids on Injection Strategies to Suppress Pre-Ignition

Singh¹,

Hlaing²,

Shi³

et al. 2019

SAE Technical Paper Series

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Pre-ignition is an abnormal engine combustion phenomenon where the inducted fuel-air charge ignites before the spark ignition. This premature combustion phenomenon often leads to heavy knocking events. The mixture preparation plays a critical role in pre-ignition tendency for a given load. Literature shows efforts made towards improving pre-ignition-limited-IMEP by splitting the injection pulse into multiple pulses. In this study, two direct injectors are used in a single cylinder research engine. A centrally mounted direct injector was used to inject Coryton Gasoline (RON 95) fuel early in the intake stroke. A second fluid was injected late in the compression stroke to suppress pre-ignition. The fluids used in the second direct injector was varied to see the effects of the molecule and its physical and chemical property on pre-ignition suppression tendency. Methanol, ethanol, water, and gasoline were tested as second fluid. Engine tests were conducted at 2000 rpm and at an intake pressure of 2.1 bar (abs). Although alcohols show high pre-ignition tendency as fuels, they were most effective at pre-ignition suppression when injected later in the compression stroke. The pre-ignition suppression led to a decrease in IMEP and an increase in cycle-to-cycle variation. Water injection was highly effective at maintaining peak IMEP values. Water injection was further explored for pre-ignition suppression. The water injection helped reduce pre-ignition count when injected at two different injection times each in intake, compression and late exhaust stroke.

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“…A late split injection strategy was suggested by [32]. The authors reported pre-ignition free operation at an IMEP of 22.7 bar while using ethanol as a fuel.…”

Section: Resultsmentioning

confidence: 99%

“…Although benefits of using split injection is emphasized, there is no consensus on why the strategy is effective [32]. Common explanations include the charge cooling effect and fuel-in-air heterogeneity, and increased turbulence near spark plug [33].…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Fluids on Injection Strategies to Suppress Pre-Ignition

Singh¹,

Hlaing²,

Shi³

et al. 2019

SAE Technical Paper Series

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“…The independence of ethyl alcohol from fossil fuels [7] and the reduction in greenhouse gaseous (GHG) emissions are important factors for the growth of its use as a clean source of energy [8][9][10]. As it is extracted from a vegetable base, it theoretically does not influence the carbon cycle, once the plants used for the fuel production absorb the CO 2 emitted by the burning of ethanol [11].…”

Section: Introductionmentioning

confidence: 99%

An evaluation of combustion aspects with different compression ratios, fuel types and injection systems in a single-cylinder research engine

Malaquias

Netto

Costa

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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The growing commercialization of flex-fuel vehicles in Brazil demands the optimization of internal combustion engines for the operation with ethanol (E100) and gasohol (E22), in an attempt to reduce the fuel consumption and minimize the pollutant emissions into the atmosphere. In this sense, this work proposes the study of different volumetric compression ratios in a single-cylinder research engine in order to conclude about its fuel conversion efficiency and, in particular, a more detailed combustion investigation for two of the most common Brazilian fuels. Dynamometric bench tests were performed for distinct compression ratios, injection systems and fuel types, which demanded a specific piston design to meet the requirements for each combustion chamber configuration. The use of ethanol was the most suitable when compared to gasohol, especially at high load conditions, in which was observed a knock tendency for E22 but not for E100, due to its improved physicochemical properties, resulting in enhanced combustion aspects. The proposed methodology proved effective in allowing fuel conversion efficiency gains for the tested fuels, injection systems and piston designs when compared to the engine baseline operation, with up to 6.1% improvement when using the most appropriate compression ratio. Finally, the ethanol direct injection confirmed the potential of this Brazilian biofuel as one of the most promising renewable options for internal combustion engines in current and future sustainable energy directives. Keywords Compression ratio • Internal combustion engine • Fuel conversion efficiency • Ethanol • Flex-fuel Abbreviations ABDC After bottom dead center APMAX Angle of maximum pressure (°) ATDC After top dead center BBDC Before bottom dead center BMEP Brake mean effective pressure (bar) BTDC Before top dead center CA Crank angle CO 2 Carbon dioxide COV Covariance (%) CR Compression ratio DI Direct injection E100

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“…1 projects, the presence of internal combustion engines on the world market by 2050 will be predominant over other propulsion systems [8], while the total number of vehicles estimated for the year 2035 is 1.7 billion [9]. Thus, several technologies have been applied to produce ever more efficient engines, such as fuel direct injection [10][11][12], continuously variable valve timing [13,14], turbulent jet ignition [15], low-temperature dual-fuel combustion [16], unconventional cycles and downsizing strategies combined with the use of biofuels [17][18][19]. In this way, it is possible to produce compact turbocharged engines that have a compatible performance with much larger units and yet produce lower pollutant emissions, consuming less fuel [20].…”

Section: Introductionmentioning

confidence: 99%

The misleading total replacement of internal combustion engines by electric motors and a study of the Brazilian ethanol importance for the sustainable future of mobility: a review

Malaquias

Netto

Filho

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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The sustainable future of mobility should not be viewed as the burial of the internal combustion engine (ICE), nowadays the main source of vehicular propulsion. Even with the increasing electrification of the transport means, the low global percentage of the electric fleet, around 0.2% of the total road vehicles, associated with an annual growth rate of less than 60%, indicates that they will not significantly change the market share in the short-and medium-term periods. This means that fuel demanded by ICEs and pollutant emissions generated by them will be very relevant in the years to come. Thus, the search for significant advances in technology associated with the use of renewable fuels is very important for environmental and economic sustainability. In this regard, the present work intends to demonstrate that the association between Brazilian ethanol and advanced technology in ICEs is a promising alternative for a more sustainable global mobility in the future. For this purpose, some ethanol properties are presented to justify its relevance as an ideal biofuel for highly boosted and efficient engines. Then, environmental, social, ethical and economic impacts arising from electric vehicles are investigated, demystifying the zero-emission vehicle terminology attributed to them and, finally, new technologies for ICEs are presented, proving that they are constantly evolving and improving, which is fundamental to the future of the world automotive fleet.

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Split-Injection in a Downsized Ethanol SIDI Engine Aiming to Mitigate Pre-Ignition

Cited by 12 publications

References 19 publications

Effect of Different Fluids on Injection Strategies to Suppress Pre-Ignition

Effect of Different Fluids on Injection Strategies to Suppress Pre-Ignition

An evaluation of combustion aspects with different compression ratios, fuel types and injection systems in a single-cylinder research engine

The misleading total replacement of internal combustion engines by electric motors and a study of the Brazilian ethanol importance for the sustainable future of mobility: a review

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