Study of fuel economy improvement through control of intake valve closing timing: cause of combustion deterioration and improvement |
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| Institution: | 1. Industrial Engineering Department, University of Naples “Federico II”, Via Claudio 21, 80125 Naples, Italy;1. Department of Solid State Physics, Faculty of Physics and Applied Informatics, University of Łódź, Pomorska 149/153, 90-236 Łódź, Poland;2. Department of Materials Technology and Chemistry, Faculty of Chemistry, University of Łódź, Pomorska 163, 90-236 Łódź, Poland;3. Department of Inorganic and Analytical Chemistry, Faculty of Chemistry, University of Łódź, Tamka 12, 91-403 Łódź, Poland |
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| Abstract: | An investigation was made of the effects of intake valve closing timing on the spark-ignition engine combustion when the closing timing was varied for the purpose of reducing pumping loss. It was found that the principal cause of combustion deterioration was a drop in cylinder gas temperature and pressure, which was traced to a decline in the effective compression ratio and to a reduction in EGR gas and residual gas fraction. It was also observed that increasing the residual gas fraction worked to mitigate the deterioration of combustion. |
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