根据阀门的控制方式，可分为伺服型执行机构和开关型执行机构。

According to valve's control mode, it is divided into servo actuator and switch actuator.

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阐述了常规气动伺服控制系统研究的现状，认为以PWM和PCM调制方式为主的开关伺服控制技术仍然是研究的热点。

Based on the development situations of the pneumatic servo control technique, the main research was also aimed at the PWM and PCM on-off servo control system.

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提出了信号的类型取决于阀口开关的规律。控制方式是信号产生和变化的关键、采用比例伺服控制可提高信息传输量等观点。

Several points of views are put forward, such as the type of signals lie on the moving rules of valves, the manners of control is the...

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