This paper aims to introduce a novel sensorless control method for a high-speed 2-phase SR motor with high accuracy. In previous research, numerous sensorless control types have been investigated for different speeds and some merits have been verified. Some sensorless methods involve actively waiting for response feedback after injecting pulses into the system. Others involve extensive mathematical calculations. However, others passively use the information obtained from current and voltage sensors to drive the motor directly. One example of this type of control is the current gradient sensorless control, which uses the information of the current to detect the peak current. This peak current can then be used as a reference point to indicate the rotor position due to the correlation between current and inductance. This paper, however, argues for a much simpler excitation control scheme. By using the peak current value as a reference, the phase currents can be controlled by thresholds of said peak current. This is possible for both the turn on and turn off signals for each phase. The current gradient method is therefore improved and simplified through the proposed method. Simulations and experiments have both been done to verify the proposed method.