Applying variable pressure difference control can reduce throttle loss and achieve better energy-saving effect.

采用变压差控制可减少阀门的节流损失，具有更好的节能效果。

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In addition, a variable rate sprayer, consisted of PWM solenoids, a pressure controller, a nozzle control system interfaced to a computer, and map based application software, was also developed.

另外，还开发了一种由脉宽调节管（PWM）、压力控制器、由电脑设定的喷嘴控制系统和基于含量分布图的应用软件组成的变量控制系统。

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In the light of the pickup current of a submersible electric pump being too large when started at full pressure, a new variable frequency control system is developed.

针对电动潜油泵工频全压启动时存在启动电流过大等诸多问题，开发出新型电动潜油泵变频控制系统。

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