直噴式層状燃焼機関における燃焼・排気特性

概要

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Combustion and exhaust emissions in a DI stratified-charge engine with a large cylinder diameter (135 mm) were examined. In order to obtain a flexible stratified mixture distribution, the fuel was injected in two stages : the first stage was set before the compression stroke to make a uniform premixed mixture and the second stage was at the end of the compression stroke to maintain stable ignition and combustion. The results showed that, compared with homogeneous stoichiometric combustion under rated power operation, 30% SFC and 50% NO_x reduction could be simultaneously achieved with lean stratified-charge combustion. SFC improvement with lean stratified-charge combustion resulted mainly from faster combustion and decreased cooling loss. Optimization for spark timings, secondary fuel injection timings, the proportions of two-stage injection, and the number of nozzle holes were all essential factors for sufficient combustion.
一般社団法人日本機械学会の論文
1994-08-25