The control system of constant pressure water supply system is complex and changeful, and the control parameters measurement is not accurate. The paper puts forward a PID control and adaptive fuzzy control with an adaptive fuzzy PID controller application for constant pressure water supply system, with the help of PID parameters on-line self-tuning fuzzy PID parameters, real-time modification, through Matlab simulation experiment system in in the running process is always in optimal condition. Adaptive fuzzy PID controller used in constant-pressure water supply system can not only improve the performance of the control system, and the maximum energy saving water supply system.%恒压供水系统中控制系统复杂多变，控制参数测定不精确；文章提出了把PID控制与自适应模糊控制结合在一起的一种自适应模糊PID控制器应用恒压供水系统中，借助于PID参数的在线模糊自整定，实时修改PID参数，通过Matlab仿真实验发现系统在运行过程中始终处于优化状态。自适应模糊PID控制器在恒压供水系统中的应用既可以提高系统控制性能，又能最大限度地节约供水系统能源。
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