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Statements

Subject Item
n2:RIV%2F68407700%3A21220%2F12%3A00202760%21RIV13-MSM-21220___
rdf:type
n5:Vysledek skos:Concept
dcterms:description
To reduce exhaust emissions and dependency on petroleum based fuels, various alcohols have been considered as neat fuels or gasoline substitutes for spark ignition engines. In this study, the effects of blends of 30% and 50% of nbutanol (1-butanol) with gasoline on combustion process, engine control unit adaptation and exhaust emissions before and after a three-way catalyst were examined on a 1.2-liter, three-cylinder spark ignition engine coupled to engine dynamometer. The adaptation of engine control unit and its effects on the fuel injection rates and air-fuel ratio, along with in-cylinder indicated pressures, exhaust gas temperatures and gaseous emissions were investigated at thirteen steady-state operating points. Where the engine maintained stoichiometric air-fuel ratio on gasoline, the engine control unit has adapted relatively successfully: Stoichiometric operation was observed on both butanol blends, with lower HC both before and after catalyst, comparable CO, and slightly higher engine-out NOx and lower or higher NOx after the catalyst. With increasing rpm and loads, the engine control unit has retarded the spark timing to prevent excessive knock. Compared to gasoline, the duration of the early combustion stage was, for butanol blends slightly shorter, and the length of the main phase of combustion was generally comparable. Flame propagation was faster with higher butanol content. Where the engine employed commanded enrichment, the fueling rate was comparable among fuels, resulting in relative enleanment when operating on blends, with lower HC and CO, higher NOx, and higher exhaust gas temperatures by up to 50 °C. Maximum engine torque has decreased by up to 5%. Changes in cycle-to-cycle variability were non-uniform. The findings were generally positive, and while limited to the one engine tested, suggest some opportunity for further investigation of the use of higher content n-butanol blends as candidate fuels for existing fleets. To reduce exhaust emissions and dependency on petroleum based fuels, various alcohols have been considered as neat fuels or gasoline substitutes for spark ignition engines. In this study, the effects of blends of 30% and 50% of nbutanol (1-butanol) with gasoline on combustion process, engine control unit adaptation and exhaust emissions before and after a three-way catalyst were examined on a 1.2-liter, three-cylinder spark ignition engine coupled to engine dynamometer. The adaptation of engine control unit and its effects on the fuel injection rates and air-fuel ratio, along with in-cylinder indicated pressures, exhaust gas temperatures and gaseous emissions were investigated at thirteen steady-state operating points. Where the engine maintained stoichiometric air-fuel ratio on gasoline, the engine control unit has adapted relatively successfully: Stoichiometric operation was observed on both butanol blends, with lower HC both before and after catalyst, comparable CO, and slightly higher engine-out NOx and lower or higher NOx after the catalyst. With increasing rpm and loads, the engine control unit has retarded the spark timing to prevent excessive knock. Compared to gasoline, the duration of the early combustion stage was, for butanol blends slightly shorter, and the length of the main phase of combustion was generally comparable. Flame propagation was faster with higher butanol content. Where the engine employed commanded enrichment, the fueling rate was comparable among fuels, resulting in relative enleanment when operating on blends, with lower HC and CO, higher NOx, and higher exhaust gas temperatures by up to 50 °C. Maximum engine torque has decreased by up to 5%. Changes in cycle-to-cycle variability were non-uniform. The findings were generally positive, and while limited to the one engine tested, suggest some opportunity for further investigation of the use of higher content n-butanol blends as candidate fuels for existing fleets.
dcterms:title
Effect of Higher Content N-butanol Blends on Combustion, Exhaust Emissions and Catalyst Performance of an Unmodified SI Vehicle Engine Effect of Higher Content N-butanol Blends on Combustion, Exhaust Emissions and Catalyst Performance of an Unmodified SI Vehicle Engine
skos:prefLabel
Effect of Higher Content N-butanol Blends on Combustion, Exhaust Emissions and Catalyst Performance of an Unmodified SI Vehicle Engine Effect of Higher Content N-butanol Blends on Combustion, Exhaust Emissions and Catalyst Performance of an Unmodified SI Vehicle Engine
skos:notation
RIV/68407700:21220/12:00202760!RIV13-MSM-21220___
n5:predkladatel
n18:orjk%3A21220
n3:aktivita
n17:P
n3:aktivity
P(ED2.1.00/03.0125), P(TE01020020)
n3:cisloPeriodika
01
n3:dodaniDat
n13:2013
n3:domaciTvurceVysledku
n19:5758602
n3:druhVysledku
n4:J
n3:duvernostUdaju
n14:S
n3:entitaPredkladatele
n11:predkladatel
n3:idSjednocenehoVysledku
133081
n3:idVysledku
RIV/68407700:21220/12:00202760
n3:jazykVysledku
n20:eng
n3:klicovaSlova
Internal combustion engines; combustion; alternative fuels; butanol; n-butanol; spark ignition engine; heat release rate; combustion timing; combustion analysis; adaptation; engine control unit; exhaust emissions
n3:klicoveSlovo
n7:adaptation n7:Internal%20combustion%20engines n7:exhaust%20emissions n7:butanol n7:spark%20ignition%20engine n7:combustion n7:combustion%20analysis n7:combustion%20timing n7:heat%20release%20rate n7:n-butanol n7:engine%20control%20unit n7:alternative%20fuels
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[0E4F9CE61FA8]
n3:nazevZdroje
Society of Automotive Engineers Technical Paper Series
n3:obor
n12:JT
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
3
n3:projekt
n9:TE01020020 n9:ED2.1.00%2F03.0125
n3:rokUplatneniVysledku
n13:2012
n3:svazekPeriodika
2012
n3:tvurceVysledku
Mazač, M. Vojtíšek, Michal Pechout, M.
s:issn
0148-7191
s:numberOfPages
27
n16:doi
10.4271/2012-01-1574
n10:organizacniJednotka
21220