SCR汽车尾气处理系统压力自整定模糊PID控制  

SCR System Pipe Pressure Controlling Based on Self-Adjustable Fuzzy PID

作　　者：段东海[1] 麦云飞[1] 

机构地区：[1]上海理工大学机械工程学院,上海200093

出　　处：《通信电源技术》2015年第5期96-98,共3页Telecom Power Technology

摘　　要：SCR尾气处理系统尿素压力管道具有非线性特性,且由于量产产品管道和泵制造过程中的误差,系统特性会表现出差异性。常规的PID算法控制在这里很难实现理想的控制效果,所以对管道尿素压力采用自整定模糊PID控制,由管道中尿素压力的过程值和设定值的误差和误差变化趋势实时调整PID的三个参数,然后由PID算法计算获得输出控制量来控制管道尿素压力。试验结果表明,该控制方法与传统PID算法相比,系统响应时间缩短53.8%,误差减小57.1%,可靠性和适应性得到增强,控制精度提高,克服了差异性,很好地实现了非线性控制。Because of the non-linear feature of SCR system and the diversity caused by the deviation existing in the pro-duction,it is not easy to get a good control effect by traditional PID.So we try to control the pipe pressure by self-adjusta-ble fuzzy PID,the 3 parameters of PID is adjusted online by the deviation and the deviation variation tendency,then the PID calculate the control variables to adjust the pipe pressure.Experiment results show:self-adjustable fuzzy PID makes the re-sponding time of system be shorted by 53.8% and deviation be reduced by 57.1 %,enhancing the reliability and adaptabili-ty,improving the control precision,overcoming the differences and realization of nonlinear control.

关 键 词：SCR尾气处理 管道 喷射 压力控制 自整定模糊PID 

分 类 号：X734.2[环境科学与工程—环境工程] TP273[自动化与计算机技术—检测技术与自动化装置]