A kind of the pulse control mode, the drive and motor closed loop, but not to the numerical control system, the feedback device, in a sense, can open loop control called the servo control.

Based on performance of real-time and closed loop feedback flight control system, a set of robust adaptive observers are set up for sensor fault isolation and reconfiguration.

An aeroengine model can be identified from actual closed-loop engine test data if pseudorandom binary sequence as test signal ACTS on feedback circuit of the closed-loop control system.