This study discusses exhaust gas emissions and engine performance inpremixed diesel c 〔 }mbus ・ tion with a suficient premixing period where 匸 ow temperature oxidati () n is inhibited with methanol 、 Diesel fuel was directly injec し ed at around 4 ゜ CA BTDC and Inethanol was intr ( )duced with intuke port injectlon. While the inhibitor effect of methanol on low temperature oxidation retards the heat release and suppresses the rapid cornbustior1 , the inhibitor ef 〔 ect dccreased whcn reducing uniformity of the premixed diesel fue1 . As a result , the ignition timing can be retarded Inore w 正 th earlier injection timings and smallcr quantities of diesel fuel. The operating range is limited by both misfiring and knocking , and un optimum quaIl し ity of methanol can prevent knocking while excessive
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