issues to overcome knocking and pre-ignition in si engines
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* Corresponding author. E-mail: [email protected]
æ¥æ¬ççŒåŠäŒèªã第 54å·» 170å·ïŒ2012幎ïŒ237-242 Journal of the Combustion Society of JapanVol.54 No.170 (2012) 237-242
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ç«è±ç¹ç«æ©é¢ã«ããããããã³ã°åã³ãã¬ã€ã°ããã·ã§ã³å æãžã®èª²é¡Issues to Overcome Knocking and Pre-ignition in SI Engines
森åãæ³°ç*
MORIYOSHI, Yasuo*
åè倧åŠå€§åŠé¢å·¥åŠç 究ç§ãã263-8522 åèåžçš²æ¯åºåŒ¥ççº 1-33Chiba University, 1-33 Yayoi-cho,Inage-ku, Chiba 263-8522, Japan
Abstract : Spark ignition engines are widely used for a small generator as well as a passenger vehicle. The exhaust gas emissions no longer have pollution problem by adopting a combination of three-way catalyst and stoichiometric mixture control, but an improvement of thermal efficiency is an urgent task. To achieve this, an increase of compression ratio and down-sizing with a turbo-charger are solutions. However, employing these methods causes abnormal combustion of such as knocking and pre-ignition that will bring about damages to engine components. In this article, why these phenomena occur and how to solve the issues are briefly mentioned with some author's ideas: since autoignition itself does not lead to a heavy knocking, a quick expansion at early expansion stroke and a spatial temperature distribution of mixture inside the cylinder can control the knocking intensity. As pre-ignition at low engine speed is not well analyzed, this phenomenon must be quantitatively examined.
Key Words : SI engine, Thermal efficiency, Abnormal combustion, Compression ratio, Down-sizing
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References
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Cooled EGR on Engine Performance and Efficiency, SAE 2012-01-1149 (2012)
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