Abstract:Aiming at the air power hysteresis and ground shutdown faults of an aero-piston engine, a fault diagnosis method based on the combination of flight dynamic model restoration, data reasoning and comparison method is proposed. Taking the flight data of American Lycoming engine and GARMIN 1000 as the research object, Using Google Earth and FLIGHTDATA to restore the track of aircraft fault segment by segment coordinates and attitude data, and combining with EGVIEW engine data software to analyze various data collected during engine operation, the typical fault data characteristics of fault engine are studied, and the actual working conditions of fault engine are judged based on the calculation results of engine residual gas coefficient during fault period. The results show that: When engine failure occurs, it is seriously rich in oil. By analyzing the structure principle of fuel regulator and testing its performance on the ground test bench, it is confirmed that the two engine faults are homologous and related to flight control, excessive slow performance parameters of fuel regulator and structural design of idle valve. At the same time, the effectiveness and accuracy of fault diagnosis by state monitoring data are verified.