给出了调节设定逻辑电平阈值的计算公式和部分电路参数，使逻辑电平界限清楚，判断确切。
It supplies the account formulas and partial circuits parameters of the threshold value for adjusting and setting-up logic level. It makes logical level boundary clear and well-judged.
结果发现，发动机燃烧室存在一个自由容积的阈值，这个值是影响发动机稳态燃烧和非稳态燃烧的界限值。
It verified that there is a free space limit in motor combustion chamber. This limit is a value that affects the stable and unstable combustion.
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