抄録
In order to detect the combustion state for an individual cycle of every cylinder in a production SI engine, the ion sensor of gasket type was used. The engine was operated under the conditions that the equivalence ratio, intake pressure and engine speed were varied. The parameters obtained from the ion current signal for an individual electrode indicated the cycle-resolved flame propagation. The value of correlation coefficient between the timing of 50% mass fraction burned and the start timing of ion current is very high under every condition. To investigate the ability of the circular type gasket ion sensor, the ion current fraction accumulated, ICFA, was defined from the summation waveform of ion current for gasket ion sensor. It was found that the rate of heat release for individual cycle is presumed by using ICFA of the circular type gasket ion sensor.
