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On the maximum pressure rise rate in boosted HCCI operation

Author(s)
Wildman, Craig B.; Scaringe, Robert J.; Cheng, Wai K.
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Abstract
This paper explores the combined effects of boosting, intake air temperature, trapped residual gas fraction, and dilution on the Maximum Pressure Rise Rate (MPRR) in a boosted single cylinder gasoline HCCI engine with combustion controlled by negative valve overlap. Dilutions by both air and by cooled EGR were used. Because of the sensitivity of MPRR to boost, the MPRR constrained maximum load (as measured by the NIMEP) did not necessarily increase with boosting. At the same intake temperature and trapped residual gas fraction, dilution by recirculated burn gas was effective in reducing the MPRR, but dilution by air increased the value of MPRR. The dependence of MPRR on the operating condition was interpreted successfully by a simple thermodynamic analysis that related the MPRR value to the volumetric heat release rate.
Date issued
2009-11
URI
http://hdl.handle.net/1721.1/66887
Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Journal
Technical Papers of the SAE 2009 Powertrains Fuels and Lubricants Meeting
Publisher
SAE International
Citation
Wildman, Craig, Robert J. Scaringe, and Wai Cheng. "On the Maximum Pressure Rise Rate in Boosted HCCI Operation." presented at SAE 2009 Powertrains Fuels and Lubricants Meeting, November 2009, San Antonio, TX, USA, SAE International, 2009.
Version: Author's final manuscript
Other identifiers
Paper Number: 2009-01-2727

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