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。
The following thesis depicts the application of SD card on variable rate fertilizer applicator based on MCU. The software and hardware design and the document system in SD card are illustrated.
本文研究了利用SD卡对变量施肥机在施肥过程中的数据存储的问题，提出了软硬件设计方案，并对SD卡中的文件系统进行了介绍。
A new rate variable bearing design principle is presented, and the application of this method applied in X62W milling machine is introduced, too.
提出了一种新型变速轴承的设计原理，并在X62 w铣床上得到了成功的应用。
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