車載高温燃料改質法によるガソリンSI機関の高圧縮比化の検討(バイオマス・新燃料・環境技術,<特集>第13回動力・エネルギー技術シンポジウム)

概要

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High thermal efficiency is established by increasing the compression ratio while the engine is operated in SI mode. In order to suppress knocking, the octane number of the fuel is raised by partially cracking the hydrocarbon molecules. When the cracking is carried out in an onboard fuel reforming system utilizing waste heat produced from the engine, it is further effective on the thermal efficiency improvement. In this study, a prototype fuel reformer was constructed and the fuel composition was analyzed with GC-MS. The primary reference fuel 90 (PRF90) was used as the test fuel. It was found that the fuel was partially cracked into small size hydrocarbons such as iso-butene and propene, which are effective in knock suppression due to their high octane number. This fuel was supplied to the test engine, which was a 4-cylinder, 2-litter, turbo gasoline engine and the compression ratio was modified to be 12. The fuel consumption decreased by approximately 4〜6%.
2009-03-25