基于模糊PID参数自整定的细胞培养箱温度控制算法

LiuDajun, HuShundi,ShiZhenzhi, ZhaoPeng,WenLuhong*,

摘要:

针对细胞培养箱温度控制具有非线性、时滞性、易受干扰且难以建立精确的数学模型的特点,传统的PID控制方法对于快速维持系统箱内温度稳定存在一定的局限性。提出了以温度误差和误差变化率为控制输入,培养箱内温度为控制量的模糊PID参数自整定的温度控制算法,实现了对PID参数的实时在线修正。实验表明,该模糊PID参数自整定温度控制算法,温度从26℃上升到目标温度37℃,建立稳态的时间为2890s,温度超调极小。系统温度控制精度为±0.05℃,并在相同型号的细胞培养箱上同样得到验证。在控制稳定性方面获得了比传统PID控制更好的控温效果,稳定快,极小超调,温度控制精度高,能满足细胞培养箱温度控制的要求。

Abstract:

The temperature control ofcell incubator has some characteristics,for example,varing nonlinearity, time-lag, strongly coupling and difficult to establish accurate mathematical model of the object,and the traditional PID control also has some faults in holding the steady of cell incubator rapidly. In this paper, temperature deviation and temperature deviation rate as input,incubator temperature as control, the self-tuning fuzzy PID algorithm is proposed, which can achieve the real-time on-line correction of PID parameters.Experimental results show that the system stabilized the temperature within 37℃in 2890 seconds when it rose from 26℃ to 37℃.The stabilized temperature overshoot range in little areaand the temperature accuracy can keep in±0.05℃,and it was demonstrated on another incubator .The temperature regulation results show that the control algorithm better than traditional PID control of fastresponse, littleovershoot,high precision, itcansatisfydemandsoftemperaturecontrolof cell incubator.