压缩冲程又名第二冲程，是将机械能转化为内能的冲程。压缩时活塞从下止点间上止点运动，这个冲程的功用有二点，一是提高空气的温度，为燃料自行发火作准备：二是为气体膨胀作功创造条件。
本文提出压缩冲程期间计算平顶活塞燃烧室流动特性摸拟的有限容积法。
This paper presents a finite-volume method for flow characteristics simulation in a combustion chamber with a flat-topped piston during the compression stroke.
通过调整挂钩，使权力中风，比压缩冲程长，发动机可以达到，但与奥托循环发动机的效率。
By adjusting the linkage to allow a power stroke that is longer than the compression stroke, the engine can achieve greater efficiency than with the Otto cycle engine.
柴油发动机内没有火花塞，取而代之的是将柴油喷入发动机气缸，然后压缩冲程在高温高压下引起燃料点火。
In a diesel engine, there is no spark plug. Instead, diesel fuel is injected into the cylinder, and the heat and pressure of the compression stroke cause the fuel to ignite.
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