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  • Study of a sequential series of breakdown voltage values of the ignition system

    The authors conducted field studies of a sequential series of breakdown voltages of the ignition system of the engine ignition model F8CV of the Daewoo Matiz car idling at a minimum crankshaft speed (650 rpm). The experiments were conducted on the basis of a microprocessor system for studying the distribution of breakdown voltage values. In addition to the distribution over the ranges of breakdown voltages, the algorithm of this system allows you to record a series of breakdown voltages in the microprocessor RAM. It was revealed that a sequential series of voltage values ​​can: increase several cycles (no more than 3 cycles); several cycles to decrease (no more than 3 cycles); stay the same. It can be assumed that there is a correlation between the breakdown voltage and the maximum cycle pressure. A further research objective is to identify the patterns of change in breakdown voltage in a sequential series of breakdown voltage values.

    Keywords: ignition system, spark discharge, internal combustion engine, spark plugs, breakdown voltage, histogram

  • Investigation of the distribution of the values of the breakdown voltages of the ignition system at various operating modes of the internal combustion engine

    The authors carried out in-situ studies of the distribution of the breakdown voltage values ​​of the F8CV engine of the Daewoo Matiz Diesel engine idling at a minimum engine speed (650 rpm) and with an increased crankshaft speed (2840 rpm). A histogram of the distribution of the values ​​of the breakdown voltage in the interelectrode gap of the spark plug is obtained for these operating modes of the internal combustion engine. It was revealed that at a minimum engine speed of the ICE crankshaft, the distribution of the cyclic values ​​of the breakdown voltages obeys the normal distribution law for a spread of 6-15 kV. At higher speeds, the distribution of the cyclic values ​​of the breakdown voltages differs from the normal distribution law. With an increase in the speed of the crankshaft, all values ​​of the breakdown voltage fall by 3-4 kV. This can be explained by homogenization of the mixture and an improvement in the conditions for breakdown of the spark plug interelectrode gap.

    Keywords: ignition system, spark discharge, internal combustion engine, spark plugs, breakdown voltage, histogram