A simplified method of transient mathematical model for non augmentation engine is presented,which is used in real time simulation for developing engine control system.Two spool inertias are considered in the simplified model,which are the main factors for engine transient performance.The combination of engine steady characteristics with transient characteristics is used in the model.The simulation shows:(1)The model has better accuracy and fast operating speed.(2)The model has better flexibility,is easy to use in different engines.(3)The model is convenient for programming in C or FORTRAN
