A new control algorithm based on the adaptive filter in time domain was brought forward.Based on this

the control system of electrically controlled rotor (ECR) blade pitch with double closed-loop was developed.Then

utilizing the test rig of model ECR

the pitch control experiments were performed in hover state.The experiments show that the developed control system of ECR blade pitch can work reliably through the tests.The control law based on the adaptive filter is successful in ECR collective pitch control

cyclic pitch control and collective pitch mixing with cyclic pitch control.The amplitude of the blade pitch was fitted well with the expected value

and the phase lag was about 10°～15°.The phase lag between the servo flap deflection and the response of blade pitch was about 20°～30°.Because of the structural and aerodynamic differences among different blades and servo flaps

the effect of blade pitch control will be reduced to some extent.