Abstract:Aiming to output response of speed control system on the aero-engine deviates from set-point seriously under speed sensor failures. Under speed sensor failures, technology of limit protection control was proposed to use to output response control of speed control system. all kinds of faults such as bias fault, drift fault, impulse fault, open fault, short fault, and periodic interference fault were injected into the speed control system. Speed control system was compared with the system of limit protection control when speed sensor failures happened. The simulation results show that the system of speed limit protection control don"t serious influence by sensor failures, comparing the speed control system, in which speed response and fuel flow maintain the set-point nearby.