航空发动机转速传感器失效下转速限制保护的控制方法

A Control Method of Speed Limit Protection for Aeroengine under Speed Sensor Failures

中国民航局发布的适航规章(CCAR33R2)对航空发动机安全性问题出台了相关规定,其中明确规定发动机控制系统必须能够容忍“单点故障”,即最大限度降低局部失效的影响。为对适航审定提供相应技术支持,针对转速传感器失效时航空发动机转速控制系统的输出响应会严重偏离设定点。在传感器失效下,提出将限制保护控制技术用于转速控制系统输出响应的控制。依次向系统注入偏置、漂移、开路、短路及周期性干扰等故障,在传感器失效下对比转速控制与限制保护控制的系统。仿真结果表明:传感器失效后,与无限制保护的系统相比,有限制保护控制的系统输出响应并未受到严重影响,转速响应及燃油流量始终维持在设定值附近,控制系统性能得以改善。

The airworthiness regulation(CCAR33R2)issued by the Civil Aviation Administration of China has issued relevant re-gulations on the safety of aviation engines,which indicates that the engine control system must be able to tolerate a single point of failure,in other word,to minimize the impact of partial failure.The research aimed to provide corresponding technical support for airworthiness certification,and situation as the output response of speed control system on the aero-engine deviates from set-point seriously under speed sensor failures.Under speed sensor failures,technology of limit protection control was used to output response control of speed control system.All kinds of faults such as bias fault,drift fault,impulse fault,open fault,short fault,and periodic interference fault were introduced into the speed control system.Speed control system was compared with the system of limit protection control when speed sensor failures happened.The simulation results show that a system with unlimited protection is not severely affected on its output response by comparing with the system of speed limit protection when sensor failures.Both the speed response and fuel flow maintain near the set-point.The performance of control system can be improved.