基于鲁棒PID算法的UEGO控制器的设计与实验  

Design and experiments for controller of UEGO sensor based on robust PID algorithm

作　　者：张媛媛[1,2] 徐科军[3] 黄云志[3] 陈佳臻[3] 滕勤[4] 谈建[4] 

机构地区：[1]合肥工业大学仪器科学与光电工程学院,合肥230009 [2]安徽大学电气工程与自动化学院,合肥230039 [3]合肥工业大学电气与自动化工程学院,合肥230009 [4]合肥工业大学机械与汽车工程学院,合肥230009

出　　处：《振动与冲击》2011年第3期139-144,共6页Journal of Vibration and Shock

摘　　要：宽域废气氧(Universal Exhaust Gas Oxygen,UEGO)传感器可以在很宽的空燃比范围内提供有效的氧含量信号,它的结构特殊,必须配以控制器才能使用。利用鲁棒PID算法控制UEGO控制器中泵电压的大小和方向,并将泵电压反馈作用在UEGO传感器上。检测UEGO传感器上的泵电流,并设计非线性校正环节对其进行校正,校正输出值即为过量空气系数(λ)。利用dSPACE实时仿真系统实现UEGO控制器,并在汽车化油器发动机台架上进行相关实验。实验数据表明,在λ值静态和动态变化时,UEGO控制器都具有良好的鲁棒性和运行性能,响应快速且精度良好。Universal exhaust gas oxygen（UEGO） sensor can effectively provide the information of oxygen content in wide scope of air-fuel ratio.Due to its special structure,it cannot work normally without a controller.Therefore a robust PID algorithm was applied to the controller of UEGO sensor for controlling the value and direction of the pump cell voltage and exerting a feedback control action on the sensor.The pump cell current was detected and a nonlinear corrector for the pump cell current was designed,which results in an excess air factor（λ）.UEGO controller was implemented by means of dSPACE real time simulation system,and experiments were conducted on a carburetor engine.Experimental results show that the UEGO controller has strong robustness and good running performance.It can achieve quick response and precision measurement when λ changes in static and dynamic modes.

关 键 词：宽域废气氧传感器 鲁棒PID算法 非线性校正 过量空气系数λ dSPACE实时仿真系统 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]