2301 分割噴射によるガソリン直噴エンジンの排気低減技術の検討(S25 エンジンの排気浄化・後処理,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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A combustion concept was proposed to reduce unburnt THC from gasoline direct injection engines. (1) The retarded ignition control with the split injection, the 1st injection timing is the later period of compression stroke and the 2nd one is the early period of expansion stroke was able to reduce THC up to 33% in comparison with a conventional method. (2) Combustion stability at retarded ignition was improved exceedingly by using the fuel-spray directed under the spark plug and the step-shaped piston. The fuel injected at the 1st injection timing was guided around the spark plug so stable stratified mixture was generated until 30degATDC. (3) There was no penalty at full load conditions with the proposed combustion concept, because required step height on the piston for the concept was considerably low so mixture distribution at full load condition was not affected by the piston geometry.
2008-08-02