Effects of ethanol content on gasohol PFI engine wide-open-throttle operation
The NOx emission and knock characteristics of a PFI engine operating on ethanol/gasoline mixtures were assessed at 1500 and 2000 rpm with λ =1 under Wide-Open-Throttle condition. There was no significant charge cooling due to fuel evaporation. The decrease in NOx emission and exhaust temperature cou...
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| Format: | Article |
| Language: | en_US |
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SAE International
2011
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| Online Access: | http://hdl.handle.net/1721.1/66907 https://orcid.org/0000-0002-7044-8156 |
| _version_ | 1826193600101220352 |
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| author | Cheng, Wai K. Kar, Kenneth Ishii, Kaoru |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Cheng, Wai K. Kar, Kenneth Ishii, Kaoru |
| author_sort | Cheng, Wai K. |
| collection | MIT |
| description | The NOx emission and knock characteristics of a PFI engine operating on ethanol/gasoline mixtures were assessed at 1500 and 2000 rpm with λ =1 under Wide-Open-Throttle condition. There was no significant charge cooling due to fuel evaporation. The decrease in NOx emission and exhaust temperature could be explained by the change in adiabatic flame temperature of the mixture. The fuel knock resistance improved significantly with the gasohol so that ignition could be timed at a value much closer or at MBT timing. Changing from 0% to 100% ethanol in the fuel, this combustion phasing improvement led to a 20% increase in NIMEP and 8 percentage points in fuel conversion efficiency at 1500 rpm. At 2000 rpm, where knocking was less severe, the improvement was about half (10% increase in NIMEP and 4 percentage points in fuel conversion efficiency). Because there was no significant change in the end gas temperature in these experiments, the gasohol knock resistance was attributed solely to the ignition chemistry of the ethanol. |
| first_indexed | 2024-09-23T09:41:41Z |
| format | Article |
| id | mit-1721.1/66907 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T09:41:41Z |
| publishDate | 2011 |
| publisher | SAE International |
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| spelling | mit-1721.1/669072022-09-26T13:10:13Z Effects of ethanol content on gasohol PFI engine wide-open-throttle operation Cheng, Wai K. Kar, Kenneth Ishii, Kaoru Massachusetts Institute of Technology. Department of Mechanical Engineering Cheng, Wai K. Cheng, Wai K. Kar, Kenneth The NOx emission and knock characteristics of a PFI engine operating on ethanol/gasoline mixtures were assessed at 1500 and 2000 rpm with λ =1 under Wide-Open-Throttle condition. There was no significant charge cooling due to fuel evaporation. The decrease in NOx emission and exhaust temperature could be explained by the change in adiabatic flame temperature of the mixture. The fuel knock resistance improved significantly with the gasohol so that ignition could be timed at a value much closer or at MBT timing. Changing from 0% to 100% ethanol in the fuel, this combustion phasing improvement led to a 20% increase in NIMEP and 8 percentage points in fuel conversion efficiency at 1500 rpm. At 2000 rpm, where knocking was less severe, the improvement was about half (10% increase in NIMEP and 4 percentage points in fuel conversion efficiency). Because there was no significant change in the end gas temperature in these experiments, the gasohol knock resistance was attributed solely to the ignition chemistry of the ethanol. Honda Visiting Scientist Program 2011-11-03T17:15:54Z 2011-11-03T17:15:54Z 2009-06 Article http://purl.org/eprint/type/JournalArticle 1946-3960 1946-3952 http://hdl.handle.net/1721.1/66907 Kar, Kenneth, Wai Cheng, and Kaoru Ishii. "Effects of Ethanol Content on Gasohol PFI Engine Wide-Open-Throttle Operation." SAE International Journal of Fuels and Lubricants, 2(1):895-901, 2009. https://orcid.org/0000-0002-7044-8156 en_US http://dx.doi.org/10.4271/2009-01-1907 SAE International Journal of Fuels and Lubricants Creative Commons Attribution-Noncommercial-Share Alike 3.0 http://creativecommons.org/licenses/by-nc-sa/3.0/ application/pdf SAE International Cheng |
| spellingShingle | Cheng, Wai K. Kar, Kenneth Ishii, Kaoru Effects of ethanol content on gasohol PFI engine wide-open-throttle operation |
| title | Effects of ethanol content on gasohol PFI engine wide-open-throttle operation |
| title_full | Effects of ethanol content on gasohol PFI engine wide-open-throttle operation |
| title_fullStr | Effects of ethanol content on gasohol PFI engine wide-open-throttle operation |
| title_full_unstemmed | Effects of ethanol content on gasohol PFI engine wide-open-throttle operation |
| title_short | Effects of ethanol content on gasohol PFI engine wide-open-throttle operation |
| title_sort | effects of ethanol content on gasohol pfi engine wide open throttle operation |
| url | http://hdl.handle.net/1721.1/66907 https://orcid.org/0000-0002-7044-8156 |
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