The gas leakage of cylinder is an important technical performance index of an IC Engine.
气缸窜气量的大小是衡量内燃机技术性能的重要指标。
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Cylinder pressure is one of the most important performances index to token the working state, and recognize the cylinder pressure indirectly has been an efficient way.
A new index is proposed to evaluate performance of the air-powered engine-the ratio of the mean effective pressure and the average pressure in the engine cylinder.