A Study of Micro Stratified Combustion Engine : 2nd Report, Combustion Characteristics of Micro Stratified Combustion Engine

Abstract

An experiment of a single cylinder spark ignition engine was conducted at a constant engine speed, fixed air flow, and using gasoline as a fuel, to demonstrate the effects of micro-stratified combustion, which was verified in the first report, on combustion characteristics. The characteristics of the micro-stratified combustion engine are those of retarded MBT spark timing, shortening of heat release lag duration, and lenghthening of first half of the heat release duration, while the combustion duration shows little change. The cyclic variation (such as standard deviation) in the peak cylinder pressure and so forth are much less for a fully vaporized fuel-air mixture than for the micro-stratification. Also the experimental results show that micro-stratified combustion appears to have a considerable potential for the anti-knock property.