实现两个信号的相位比较，增加或减少脉冲，可供后续模块使用-The phase comparator to achieve the two signals obtained retardation

This paper develops the brushless dc (BLDC) motor sensorless control system for an automotive fuel pump. The sensorless techniques that are based on a hysteresis comparator and a potential start-up method with a high starting torque are suggest