目前,工业过程微机控制系统普遍采用PID调节规律。而PID参数,一般均根据对象的传递函数粗略设定,然后在实验中通过在线精确调整以求得最佳参数。笔者通过在线改变参数调试PID特性时,发现如不采取措施而改变K_P参数,运算结果就会出错,但改变K_l或K_d参数,则运算结果正确。本文将根据增量算法的运算过程详细分析其出错原因,并提出防止出错的相应措施,实践证明该措施是行之有效的。 At present, the industrial process microcomputer control system commonly used PID regulation. The PID parameters, generally based on the object’s transfer function roughly set, and then in the experiment through online accurate adjustment in order to obtain the best parameters. When the author changes PID parameters online and finds that if K_P parameters are changed without taking measures, the operation result will be wrong. However, if K_l or K_d parameters are changed, the calculation result is correct. In this paper, the reason of error is analyzed in detail according to the computing process of incremental algorithm, and the corresponding measures to prevent errors are put forward. Practice has proved that this measure is effective.