在过去，机器内部的一整套控制系统是由硬件组成的：传动装置，杠杆和凸轮。

The control systems inside machines used to be physical: gears and levers and cams.

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使用滚柱挺杆或滑动挺杆来传动旋转凸轮轴做上下快速提升动作（开启和关闭发动机的进气阀和排气阀）的现代型汽车发动机似乎不会出现上述自动熄火的情况。

Modern car engines that use rolling or sliding tappets for transmitting the rapid up-down lifting motion of the spinning camshafts—to open and close the engine’s inlet and exhaust valves—seem immune.

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第二、传动系统有些的分体式凸轮、开口式联接板最佳并且便于维修。

Second, some of the transmission system split CAM, open type connection plate is best and easy to repair.

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