Fault processing method and system for total fault of atmospheric temperature signal of turboshaft engine

The invention discloses a fault processing method and system for a total fault of an atmospheric temperature signal of a turboshaft engine, and the method comprises the steps: obtaining an atmospheric environment temperature value during the total fault after the total fault occurs, comparing the atmospheric environment temperature value with an atmospheric environment temperature value of a sea level standard day, and employing a corresponding fault processing strategy according to a comparison result; when the atmospheric environment temperature value during full failure is lower than the atmospheric environment temperature value of the sea level standard day, the atmospheric environment temperature value of the sea level standard day is directly adopted, it is ensured that the angle of the guide vane of the engine changes in the decreasing direction, the steady-state surge margin of the engine is increased accordingly, and the safety of the engine is not affected; and when the atmospheric environment tempe