临界增益与临界振荡周期的一种估计方法

An Estimating Method of Ultimate Gain and Ultimate Period

基于被控过程阶跃响应的特征面积，提出了一种估计临界增益和临界振荡周期的方法，并将其应用于自整定ＰＩＤ控制上，数字仿真的结果证实了方法的有效性。

At tuning PID controller,ultimate gain Ku and ultimate period Tu of the proceseare usually the desired parameters.To lessen disturbance of tuning action and av oid to drive thesvstem to the verge of instability,a new estimating methed of Ku and Tu is developed,which based onthe charactristic areas of the u nit step response of the procase,By this method,it is easy forauto-tuning PID controller with Ziegler-Nichols like tuning formula. Results of digital simulationshow that this method is effective.