软件采用曲线拟合算法。
最后对系统中采用的PID控制和曲线拟合算法进行了描述，并对测试结果进行了分析。
Finally, PID control and curve fitting algorithm were discussed together with testing data analysis.
通过现场实验数据，并利用最小二乘曲线拟合算法建立被控对象各通道之间的二阶系统模型。
Second: via experimental data we get the second-order system model for each control object by using least square curve simulation.
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