基于排气温度动态模型的在线观测器研究  

Construction for Online Observer Based on Exhaust Gas Temperature Dynamic Model

作　　者：李佳蔚 崔涛[1] 刘宇航[2] 师帅楠 孙强 LI Jiawei;CUI Tao;LIU Yuhang;SHI Shuainan;SUN Qiang(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China;Beijing Institute of Space Launch Technology,Beijing 100076,China;Hebei Huabei Diesel Engine Co.,Ltd.,Shijiazhuang 050081,Hebei,China)

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]北京航天发射技术研究所,北京100076 [3]河北华北柴油机有限责任公司,河北石家庄050081

出　　处：《兵工学报》2019年第8期1562-1571,共10页Acta Armamentarii

基　　金：国防“十三五”预先研究项目(2016年)

摘　　要：排气温度传感器作为柴油机排放控制和状态监测的重要部件,广泛应用于柴油机电子控制领域。为满足二级增压中低压级涡轮后排气温度传感器在线故障诊断与容错控制的需要,以某特定型号发动机为例,建立排气温度动态模型来反映缸内燃烧状况,利用空燃比、转速和海拔高度对排气温度因子进行虚拟标定;构建包含1阶滞后环节的排气温度在线观测器,并针对典型工况对观测器有效性进行稳态和动态验证。研究结果表明:基于排气温度动态模型的在线观测器可实现涡后排气温度的在线估计,稳态精度达到±3%以内,动态精度达到±8%以内,响应时间小于3s;所构建在线观测器具有良好的计算精度和动态响应性能。As one of the most core components for diesel emission control and monitoring,the exhaust temperature sensor is widely used for electronic control of diesel engine.In order to satisfy the needs of on-line fault diagnosis and fault-tolerant control of rear temperature sensors for the two-stage turbocharging system,an engine is used to establish a dynamic model of exhaust gas temperature which reflects the combustion conditions of cylinder,and the air-fuel ratio,engine speed,and altitude are used to calibrate the exhaust gas temperature influencing factors virtually.An on-line exhaust gas temperature observer including first-order lagging links was constructed,and the effectivenesses of observer at steady state and dynamic situation were verified in typical operating conditions.The result shows that the on-line observer can be used for on-line temperature estimation,which has a high calculation accuracy and dynamic response performance with the steady state accuracy of±3%,the dynamic accuracy of±8%,and the response time of less than 3 s.

关 键 词：柴油机 排气温度 排气温度动态模型 在线观测器 故障诊断 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]