Aiming at problem of poor adaptability to fuels

large noise and short service life that existing vehicle fuel pump has

sensorless brushless DC motor（ BLDC motor） control system is designed and applied in electronic fuel pump. Based on analysis on BL motor rotation principle of

virtual mid-point voltage of back electromotive force is utilized in control program to estimate zero-crossing point signal

and combined with pre-positioning method

control of sensorless BLDC motor is realized. The experimental results show that this control system can accurately detect the zero-crossing points of back EMF

the motor works smoothly

the flow rate of fuel also meets the actual demands of vehicle.