CAD的二次开发，有助于CAD中的块操作,请大家多提宝贵意见-The secondary development of CAD, CAD will help in the block operation, please make more valuable advice

采用微分先行PID控制实现对液位的控制采用增量式PI控制实现流量的快速跟踪且波动范围较采用经验方法分别对上述两个PID控制器参数进行整定。-Of liquid level control is realized by using derivative ahead PID control flow is realized by using incremental PI control of the fast track and the fluctuation range respectively