在压缩行程，活塞向上运动，进气门和排气门关闭，活塞压缩混合气。
On the compression stroke, the piston moves up. The intake valve and exhaust valve close. The piston compresses the air-fuel mixture.
在作功行程，进气门和排气门关闭，火花塞点燃混合气，活塞向下移动。
On the power stroke, the intake valve and exhaust valve close. The spark plug ignites the air-fuel mixture, the piston moves down.
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.
推荐可变压缩比（VCR）方案、可变废气再循环率（EGR）方案、可变排气门关闭时刻方案，以及废气再循环滚流分层充气方案等。
Schemes of variable compression ratio (VCR), variable exhaust gas recirculation (EGR), variable exhaust valve timing, and EGR with stratification by tumble charge flow are recommended.
结果表明，通过调节排气门关闭正时，适当增大缸内残余废气量，可显著改善起动过程初始着火循环的着火燃烧性能和提高起动过程缸内燃烧的稳定性。
The results show that a proper increase of residual gas fraction could promote ignition and combustion stability of first firing cycle significantly during cold start.
由于进气门关闭、排气门也已关闭，现在活塞上部的空间被密封了。
The space above the piston is now sealed due to the inlet valve closing and the exhaust valve having already closed.
在发动机中，凸轮轴上的凸轮控制进气门和排气门的开启和关闭。
In the engine, cams on the CAM shaft cause the intake and exhaust valves to open.
计算分析了进排气门实际关闭相位，并根据低压示功图中气门落座冲击引起的干扰信号间接确定发动机运转时的实际关闭相位。
The actual valve closing phases have been calculated, analyzed and determined in accordance with the interference signals caused by valve seating impulse in the low pressure indicator diagram.
但是像进气门一样，排气门需要时间到达充分打开和关闭的位置。
But like the inlet valve, the exhaust valve needs time to reach the full-open position, it also needs time to reach the full-closed position.
通过对模糊控制器的设计，计算出EQ6 10 0汽油机在不同工况下的排气门提前开启角和进气门滞后关闭角的模糊控制值。
The fuzzy control values of the optimized exhaust lag angle and intake advance angle of the EQ6100 engine are calculated by designing the fuzzy controller.
通过对模糊控制器的设计，计算出EQ6 10 0汽油机在不同工况下的排气门提前开启角和进气门滞后关闭角的模糊控制值。
The fuzzy control values of the optimized exhaust lag angle and intake advance angle of the EQ6100 engine are calculated by designing the fuzzy controller.
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