PID是比例、积分、微分三个词语的英文缩写，PID运算用于自动控制中。当设定值和实际值不一样时，对误差进行PID运算，运算结果输入到执行器。这里给的是数字PID运算。-PID is proportional, integral, differential three words in the English abbreviation for Operational PID automatic control. When the set value and the actual value is not the same as the error PID operation, calculation results to the importation of actuators. Here are the figures for the operation of PID.