涡轴发动机燃油信号故障对策

Fault Accommodation of Fuel Signal for Turbine-Shaft Engine

某型涡轴发动机燃油计量活门位置信号失效后,采取直接停车的处理对策。为了提高燃油系统的可靠性和安全性,设计了一种基于伺服回路校正的方法。在燃油计量活门位置信号失效后,通过在燃油伺服回路中串联1个校正器,使得校正后的通路增益为1,计算出合适的电流继续控制燃油执行机构,可避免发动机停车,实现发动机稳定控制。采用基于单点积分的扫频法,在半物理试验器上辨识出燃油执行机构的高精度数学模型,并根据数学模型设计了校正器的控制参数。在仿真模型、控制系统半物理试验器以及发动机地面试验台对增加校正器的燃油系统进行试验验证。试验结果表明:该伺服回路串联校正方法可以在燃油计量活门位置信号失效后,有效控制发动机在一定状态下稳定工作。

After the failure of the position signal of the fuel metering valve of a turbo-shaft engine,the accommodation of artificial shut⁃down was adopted.In order to improve the reliability and safety of the fuel system,a servo loop correction method was designed.After the position signal of fuel metering valve failed,the corrected path gain was 1 through a in series corrector in the fuel servo loop.By calculating the appropriate current to continue to control the fuel actuator,the engine shutdown could be avoided and the engine stability control could be realized.A high-precision mathematical model of fuel actuator was identified on a semi-physical tester by sweep frequency method based on single point integration,and the control parameters of corrector were designed by the model.The simulation model,the semi-phys⁃ical tester of the control system and the ground test bench of the engine were tested and verified for fuel system with corrector added.The test results show that the servo loop correction method can effectively control the engine to work stably under certain condition after the po⁃sition signal of fuel metering valve fails.