进气冲程在活塞位与气缸顶部（进气门开启，排气门关闭）时开始，在活塞到达其行程的底部时结束。
The intake stroke starts with the pistonat the top of the cylinder (intake valve open and exhaust valve closed) and stops with the pistonat the bottom of its travel.
进气冲程缸内形成的流场状态直接影响发动机燃烧过程中火焰的传播速度、燃烧的稳定性以及燃烧是否彻底，进而也影响着发动机的功率。
The flow character in the intake process would affect the spreading velocity of the flame, the stability of the combustion and its combustion efficiency.
这四招进气行程，紧缩行程，动力冲程和排气冲程。
These four strokes are intake stroke, compression stroke, power stroke and exhaust stroke.
这四招进气行程，紧缩行程，动力冲程和排气冲程。
These four strokes are intake stroke, compression stroke, power stroke and exhaust stroke.
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