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针对城市供水系统的关键环节——压力供水泵站中水泵的控制问题， 提出了采用具有滞环的继电器型非线性控制理论对水泵进行逻辑控制的方法， 设计了一个切实可行的硬件电路。以 ＰＬＣ 作为逻辑控制单元，并编制了控制软件
Aiming at the key link of the urban water supply system, the control of the water pump in the pressure water supply pump station, a method of logic control of the water pump using a relay-type nonlinear control theory with hysteresis was proposed. A practical hardware circuit was designed. PLC as logic control unit and control software