一类传感器故障的主动容错控制

Active fault tolerant control for sensor failure

目的为提高航空涡扇发动机数控系统可靠性。方法以某型涡扇发动机为对象,利用小偏离方法建立发动机建模,以传感器输出误差最小为性能指标函数,采用控制律重构方法设计主动容错控制器,使发动机控制系统在传感器故障情况下依然能维持发动机稳定工作。结果得到在飞行包线设计点发动机线性模型和主动容错控制器。结论该方法在发动机稳态工作点可有效地实现容错控制,提高航空发动机数控系统的可靠性,且控制精度高,实时性好。

Aim To improve Aero-Turbofan engine′s reliability.Methods Using little deviation method to build aero engine′s linear model,sensor ouput error as optimizing objective function,designing active fault-tolerant controller based on contorl law reconfiguration method to maintain aero engine normally working.Results Aero engine linear model within flight envelope designed point and active fault-tolerant controller.Conclusion The simulation results proved that the controllers have good fault tolerant performance in stable state,improved the reliability of aeroengine digital control system.The method has good control accuracy and real time capability.