In view of the fact that the simplified flux linkage method of switched reluctance motor (SRM) could only realize singlephase online operation and the conduction interval was fixed, a sensorless control technology combining fixed turnoff angle and adaptive adjustment of turnon angle was proposed. Using the curvefitting turnoff position flux to replace the traditional stored data table, the turnoff position signal and the estimated speed and other positions were determined by comparing the realtime calculated dynamic flux linkage and the curvefitted static flux linkage. Considering the nonlinear characteristics of the impedance and inductance of the motor, the conduction interval was determined by optimizing the selfregulating model of the opening angle in the minimum inductance region. The simulation results verified the feasibility and correctness of the scheme, which could realize the indirect detection of rotor position and further optimize the operation efficiency of the motor.