Engine performance affected by direct injection timing in a dual ethanol injection SI engine

Al-Muhsen, NFO; Hong, G

Engine performance affected by direct injection timing in a dual ethanol injection SI engine

Al-Muhsen, NFO

Hong, G

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Publication Type:: Conference Proceeding
Citation:: 11th Asia-Pacific Conference on Combustion, ASPACC 2017, 2017, 2017-December
Issue Date:: 2017-01-01

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Field	Value	Language
dc.contributor.author	Al-Muhsen, NFO https://orcid.org/0000-0001-5606-0131	en_US
dc.contributor.author	Hong, G https://orcid.org/0000-0002-1905-1161	en_US
dc.date.available	2017-12-10	en_US
dc.date.issued	2017-01-01	en_US
dc.identifier.citation	11th Asia-Pacific Conference on Combustion, ASPACC 2017, 2017, 2017-December	en_US
dc.identifier.uri	http://hdl.handle.net/10453/121479
dc.description.abstract	© 2018 Combustion Institute. All Rights Reserved. Ethanol fuel, as a bioproduct, has become an alternative option to gasoline fuel in SI engines. Dual ethanol injection strategy (DualEI) is a new technology under development to maximise the benefits of ethanol’s properties to the SI engine use. The direct injection timing could significantly affect the DualEI engine performance and fuel economy. In this study, four direct injection timings were set after the intake valve closed to investigate the combustion and emissions characteristics and specific fuel consumption of the DualEI engine. Experiments were conducted at a light load (Engine torque 6.5-7.5 N.m) and four-selected spark timings at a fixed direct injection ratio. The results showed that the IMEP and engine thermal efficiency improved with advanced direct injection timing from TDC, and the indicated specific fuel consumption was reduced. As the direct injection timing works interactively with spark timing, advanced spark timing could improve the engine performance when the direct injection timing was retarded. The maximum improvement to the IMEP was 7.61%, and the indicated specific fuel consumption reduction was 7.07%. This was attributed to the improved mixture and combustion quality caused by the longer time available when the direct injection timing was advanced. The greater in-cylinder pressure and temperature could play a significant role in the engine performance improvement when the direct injection timing was retarded, and the spark timing was advanced. Consequently, the indicated specific nitric oxide (ISNO) was sharply increased because it is directly related to the burned gas temperature. On the other hand, because of the cooling effect, ISNO decreased with the retarded timing of the direct injection. The indicated specific carbon monoxide was increased with advanced direct injection and spark timings. This was attributed to the lean mixture quality caused by the decreased equivalence ratio with the advanced direct injection timing.	en_US
dc.relation.ispartof	11th Asia-Pacific Conference on Combustion, ASPACC 2017	en_US
dc.title	Engine performance affected by direct injection timing in a dual ethanol injection SI engine	en_US
dc.type	Conference Proceeding
utslib.citation.volume	2017-December	en_US
utslib.for	0902 Automotive Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Mechanical and Mechatronic Engineering
pubs.organisational-group	/University of Technology Sydney/Students
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	2017-December	en_US

Abstract:

© 2018 Combustion Institute. All Rights Reserved. Ethanol fuel, as a bioproduct, has become an alternative option to gasoline fuel in SI engines. Dual ethanol injection strategy (DualEI) is a new technology under development to maximise the benefits of ethanol’s properties to the SI engine use. The direct injection timing could significantly affect the DualEI engine performance and fuel economy. In this study, four direct injection timings were set after the intake valve closed to investigate the combustion and emissions characteristics and specific fuel consumption of the DualEI engine. Experiments were conducted at a light load (Engine torque 6.5-7.5 N.m) and four-selected spark timings at a fixed direct injection ratio. The results showed that the IMEP and engine thermal efficiency improved with advanced direct injection timing from TDC, and the indicated specific fuel consumption was reduced. As the direct injection timing works interactively with spark timing, advanced spark timing could improve the engine performance when the direct injection timing was retarded. The maximum improvement to the IMEP was 7.61%, and the indicated specific fuel consumption reduction was 7.07%. This was attributed to the improved mixture and combustion quality caused by the longer time available when the direct injection timing was advanced. The greater in-cylinder pressure and temperature could play a significant role in the engine performance improvement when the direct injection timing was retarded, and the spark timing was advanced. Consequently, the indicated specific nitric oxide (ISNO) was sharply increased because it is directly related to the burned gas temperature. On the other hand, because of the cooling effect, ISNO decreased with the retarded timing of the direct injection. The indicated specific carbon monoxide was increased with advanced direct injection and spark timings. This was attributed to the lean mixture quality caused by the decreased equivalence ratio with the advanced direct injection timing.

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http://hdl.handle.net/10453/121479