Negative Valve Overlap Mode and Diesel of HCCI Operation Using Gasoline Blended Fuels |
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| Authors: | ZHONG Shaohua CHEN Yongdong Miroslaw Lech Wyszynski XU Hongming |
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| Institution: | [1]Wuhan University of Technology, Wuhan 430070, China [2]The University of Birmingham, Birmingham B15 2TF, UK |
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| Abstract: | The negative valve overlap (NVO) strategy of HCCI operation was experimentally investigated on a gasoline HCCI engine operated with variable valve timing in association with the addition of diesel fuel. The experimental results show that, by using gasoline and diesel blended fuels, the required NVO interval for suitable HCCI combustion under a given engine speed and a moderate compression ratio condition could be reduced, and the HCCI combustion region was extended remarkably without substantial increase in NO, , emissions under a given inlet and exhaust valve timing due to the improvement of charge ignitability. In addition, the possible scale of NVO was extended. A substantial increase in the lean limit of excess air ratio and the upper limit of load range can be achieved because of higher volumetric efficiency, resulting from the decrease in the required NVO and the presence of less residual gases in cylinder. |
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| Keywords: | homogeneous charge compression ignition (HCCI) negative valve overlap(NVO) combustion blended fuels |
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