On the High Load Limit of Boosted Gasoline HCCI Engine Operating in NVO mode
The high load limit of a boosted homogeneous-charge-compression-ignition (HCCI) engine operating on negative-valve-overlap (NVO) was assessed. When operating under stoichiometric condition with no external dilution, the load, as measured by the net indicated mean effective pressure (NIMEP), increase...
| Main Authors: | , , |
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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/1721.1/66905 https://orcid.org/0000-0002-7044-8156 |
| _version_ | 1811071332869210112 |
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| author | Scaringe, Robert J. Cheng, Wai K. Wildman, Craig B. |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Scaringe, Robert J. Cheng, Wai K. Wildman, Craig B. |
| author_sort | Scaringe, Robert J. |
| collection | MIT |
| description | The high load limit of a boosted homogeneous-charge-compression-ignition (HCCI) engine operating on negative-valve-overlap (NVO) was assessed. When operating under stoichiometric condition with no external dilution, the load, as measured by the net indicated mean effective pressure (NIMEP), increased with increase in manifold absolute pressure (MAP), and with decrease in trapped amount of residual gas. The maximum pressure rise rate (MPRR), however, also increased correspondingly. When the MAP and the amount of residual gas were adjusted so that the engine operating point could be held at a constant MPRR value, the NIMEP increased with the simultaneous decrease in MAP and residual until the misfire limit was reached. Therefore if a MPRR ceiling is imposed, the high load limit of an HCCI engine is at the intersection of the constraining MPRR line and the misfire line. Dilution with cooled exhaust gas recirculation (EGR) shifted both the MPRR line and the misfire line so that the intersection point would be at a higher MAP and a higher level of dilution. The NIMEP value at this new intersection point, however, did not change substantially. Thus using cooled EGR dilution strategy, the MPRR constrained high load limit is approximately neutral to boosting. |
| first_indexed | 2024-09-23T08:49:31Z |
| format | Article |
| id | mit-1721.1/66905 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T08:49:31Z |
| publishDate | 2011 |
| publisher | SAE International |
| record_format | dspace |
| spelling | mit-1721.1/669052022-09-23T14:47:40Z On the High Load Limit of Boosted Gasoline HCCI Engine Operating in NVO mode Scaringe, Robert J. Cheng, Wai K. Wildman, Craig B. Massachusetts Institute of Technology. Department of Mechanical Engineering Cheng, Wai K. Scaringe, Robert J. Cheng, Wai K. Wildman, Craig B. The high load limit of a boosted homogeneous-charge-compression-ignition (HCCI) engine operating on negative-valve-overlap (NVO) was assessed. When operating under stoichiometric condition with no external dilution, the load, as measured by the net indicated mean effective pressure (NIMEP), increased with increase in manifold absolute pressure (MAP), and with decrease in trapped amount of residual gas. The maximum pressure rise rate (MPRR), however, also increased correspondingly. When the MAP and the amount of residual gas were adjusted so that the engine operating point could be held at a constant MPRR value, the NIMEP increased with the simultaneous decrease in MAP and residual until the misfire limit was reached. Therefore if a MPRR ceiling is imposed, the high load limit of an HCCI engine is at the intersection of the constraining MPRR line and the misfire line. Dilution with cooled exhaust gas recirculation (EGR) shifted both the MPRR line and the misfire line so that the intersection point would be at a higher MAP and a higher level of dilution. The NIMEP value at this new intersection point, however, did not change substantially. Thus using cooled EGR dilution strategy, the MPRR constrained high load limit is approximately neutral to boosting. United States. Dept. of Energy 2011-11-03T17:00:22Z 2011-11-03T17:00:22Z 2010-04 Article http://purl.org/eprint/type/JournalArticle 1946-3944 1946-3936 http://hdl.handle.net/1721.1/66905 Scaringe, Robert, Craig Wildman, and Wai K. Cheng. On the High Load Limit of Boosted Gasoline HCCI Engine Operating in NVO Mode. SAE International Journal of Engines, 3(1):35-45, 2010. https://orcid.org/0000-0002-7044-8156 en_US http://dx.doi.org/10.4271/2010-01-0162 SAE International Journal of Engines Creative Commons Attribution-Noncommercial-Share Alike 3.0 http://creativecommons.org/licenses/by-nc-sa/3.0/ application/pdf SAE International Cheng |
| spellingShingle | Scaringe, Robert J. Cheng, Wai K. Wildman, Craig B. On the High Load Limit of Boosted Gasoline HCCI Engine Operating in NVO mode |
| title | On the High Load Limit of Boosted Gasoline HCCI Engine Operating in NVO mode |
| title_full | On the High Load Limit of Boosted Gasoline HCCI Engine Operating in NVO mode |
| title_fullStr | On the High Load Limit of Boosted Gasoline HCCI Engine Operating in NVO mode |
| title_full_unstemmed | On the High Load Limit of Boosted Gasoline HCCI Engine Operating in NVO mode |
| title_short | On the High Load Limit of Boosted Gasoline HCCI Engine Operating in NVO mode |
| title_sort | on the high load limit of boosted gasoline hcci engine operating in nvo mode |
| url | http://hdl.handle.net/1721.1/66905 https://orcid.org/0000-0002-7044-8156 |
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