The control scheme for multi pump operation is thus improved, which changes pump frequency and controls pump operation according to water consumption.

改进了多台水泵的控制方式，即根据系统用水量改变水泵频率从而控制水泵的运行情况。

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Because of the limit in modern industry sites, the frequency of the process variables detect is different. We can resolve the problem by multi frequency and multi variable control.

在工业现场由于条件的限制，很多过程变量需要的检测频率并不一样，从而带来了多频多变量的控制问题。

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The technique is based on multi- dimension space transform, the realizing of this technique is convenience, and it is easy to control the secret key of frequency hopping.

该方法基于多维空间变换，构造频率转移函数简单方便，而且便于跳频密钥的管理和控制。

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