Generator control apparatus suitable for integrated starter generator and method of starting the same

A method of starting an integrated starter generator, driving a starter generator without using a rotor position sensor to start an engine, the method comprising steps of:

• (a) applying a first drive current with a first frequency and a first amplitude to drive the starter generator to reversely rotate in a speed open-loop control mode, acquiring a d-axis voltage signal and/or a q-axis voltage signal according to a drive voltage and the first drive current of the starter generator, and using the d-axis voltage signal and/or the q-axis voltage signal as a first load information,
• (b) confirming whether the first load information meets a heavy load condition,
• (c) stopping reversely rotating the starter generator when the first load information meets the heavy load condition, and
• (d) forwardly rotating the starter generator to drive the engine to start,
• wherein the speed open-loop control mode is according to whether the drive voltage and the first drive current correspondingly meet the heavy load condition, without referring to a speed of the starter generator.