James Watt's flyball governor (1769) regulated steam flow to a steam engine to maintain constant engine speed despite a changing load.
1769年瓦特的飞球调速器，它是一种调节蒸汽流的装置，即使荷载变化仍可保持蒸汽机的转速不变。 收藏。
At the same time, constant engine speed stabilizes output displacement of hydraulic pump and then stabilizes travel speed and vibratory frequency in turn, so that compaction quality is increased.
同时，发动机转速的恒定也使液压泵输出排量稳定，进而保证了行走速度和振动频率的稳定，提高了压实质量。
When the locomotive is traveling at a constant speed or idling, the battery rather than the diesel engine can power the motor.
当火车头在相对恒定速度下前进或者空转时，这时电池就为马达提供能量，柴油发动机不工作。
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