Patent ID: 7427843

Claim:
An electrically operated power steering controller for controlling the operation of an electric motor for generating auxiliary steering torque, the electrically operated power steering controller comprising: driving electric current target signal generating means for generating a driving electric current target signal representing a driving electric current target value Itag for said electric motor; offset correcting means for generating a corrected driving electric current signal representing a corrected driving electric current value Iamd driving electric current detecting means for generating a driving electric current detecting signal representing a driving electric current value Imtr of said electric motor and for supplying the driving electric current detecting signal to said offset correcting means; offset value input means for receiving a driving electric current offset value Ioff having accuracy higher than that of the value of the electric current detecting signal at a time when the driving electric current target value Itag is set to zero from outside of said electrically operated power steering controller and for inputting the driving electric current offset value Ioff to said offset correcting means, wherein said offset value input means is connected to said offset correcting means; a nonvolatile memory connected to said offset correcting means and holding the driving electric current offset value Ioff; and electric motor driving control means for controlling the operation of said electric motor on the basis of the driving electric current target signal and the corrected driving electric current signal, wherein said offset correcting means generates the corrected driving electric current signal provided by correcting the driving electric current detecting signal by using the driving electric current offset value Ioff.