燃油涡轮流量传感器故障仿真及试验研究

在进行无人机燃油流量检查过程中,发动机在低转速下试车,燃油流量测量结果与理论值相差甚远。为定位并分析故障产生原因,基于simulink建立了燃油涡轮流量传感器数学逻辑模型进行故障仿真。仿真结果表明,外界磁场通过燃油涡轮流量传感器内部线圈耦合产生干扰信号,进而转换为干扰脉冲,使得脉冲频率增大。在燃油测试台上利用线圈瞬间通/断电模拟外界磁场干扰进行验证试验,进一步验证了仿真结果的正确性。对磁-电式涡轮流量传感器排故工作具有指导意义。

Research on Fault Simulation and Experiment of Oil Turbine Flowmeter

The difference between the measured value and the theoretical value was great, when testing the fuel flow of UAV under engine running slowly condition. For locating and analyzing the fault cause, the logic model of oil turbine flowmeter was established and simulated based on simulink. The result of simulation showed that the fault was caused by external electromagnetic interference. First, external electromagnetic interference was coupled with the coil of turbine flowmeter to cause interferences. Then, the interferences were transferred to unwanted plus. Last, the frequency was larger than real value. Demonstration experiment was done on fuel testing equipment using external coil on-off electricity to imitate external electromagnetic interference, and the result had corroborated with the result of simulation. It has guiding value to fault elimination on magnetoelectric turbine flowmeter.