描述
经验法整定PID的关键是“调参数，看曲线”。因此，在调整过程中，必须弄清PID调节器参数变化对过渡过程曲线的影响关系。例如，看到曲线波动很大时，就不能再减小P值(比例度)，也不应该减小I值或加大D值，否则就会使系统出现剧烈振荡
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