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.
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。
The piston travels down on the intake stroke, up on the compression stroke, down on the power stroke and up on the exhaust stroke.
进气行程，活塞下行；压缩行程，活塞上行；做功行程，活塞下行；排气行程，活塞上行。
A diagrammatic method is employed to compute shock absorber force at compression stroke.
提出了计算压缩行程减振器阻力的图解法。
Power stroke. As the piston reaches TDC on the compression stroke, an electric spark is produced at the spark plug.
做功行程：当活塞到达压缩行程的上止点时，火花塞产生电火花。
On the compression stroke, the piston moves up. The intake valve and exhaust valve close. The piston compresses the air-fuel mixture.
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。
The result shows that tangent turbulence intensity is nearly the same from the outer to the center of the cylinder in the compression stroke.
结果表明在压缩过程中，从缸心到缸壁，切向湍流强度值大体相同。
When the compression stroke is finished, the longitudinal pressure relief grooves are communicated with the air exhaust hole to release the high pressure.
当压缩行程完成时纵向泄压凹槽与排气孔相通，实现高压被释放的目的。
When the compression stroke is finished, the longitudinal pressure relief grooves are communicated with the air exhaust hole to release the high pressure.
当压缩行程完成时纵向泄压凹槽与排气孔相通，实现高压被释放的目的。
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