Patent ID: 8483913

Claim:
A self-calibration method for an electric power steering system, comprising establishing a computer processor for performing the following steps: Step (A): detecting a power supply value of a sensor module and examining whether said power supply meets a power supply condition; if said power supply does not meet said power supply condition, interrupting operation of an electric power steering system; if said power supply meet said power supply condition, executing Step (B); Step (B): examining whether said power supply value is a preset power supply value; if said power supply value is not a preset power supply value, undertaking voltage offset compensation; if said power supply value is a preset power supply value, executing Step (C); Step (C): examining whether said sensor module operates normally; if said sensor module cannot operate normally, said electric power steering system switching auxiliary functions thereof; if said sensor module operates normally, executing Step (D); and Step (D): examining whether said sensor module meets a preset self-calibration triggering condition; if said sensor module does not meet said preset self-calibration triggering condition, using a previous calibration value of said sensor module, and said electric power steering system compensates the value of the said sensor module to undertake detection; if said sensor module meets said preset self-calibration triggering condition, said electric power steering system undertaking a normalization calibration.