Based on the results of theoretical analyses and experimental studies, the regularity ofthe slight pressure fluctuations in the crank case of an internal combustion engine is describedin this paper. Furthermore, the relation of the shape of gas pressure fluctuations and the gapbetween piston rings and cylinder-wall is studied, and then a technique of the detection ofgas pressure fluctuations and the determination of their characteristic parmeters aresuggested. The proposed technique can be used to recognize and diagnose the piston ringw...
