Patent ID: 7272479
Filing Date: 2007-09-18
Classification: B62D,H02P

Abstract:
1. An adjusting method of a driving electric current offset in an electrically operated power steering controller comprising: generating, by a driving electric current target signal generating means, a driving electric current target signal representing a driving electric current target value Itag for an electric motor for generating auxiliary steering torque; generating, by an electric current detecting means, a driving electric current detecting signal representing a driving electric current value Imtr of said electric motor; generating, by an offset correcting means, a corrected driving electric current signal representing a corrected driving electric current value Iamd provided by correcting the driving electric current value Imtr by using a driving electric current offset value Ioff of said electric motor when said driving electric current target value Itag is set to zero; and controlling, by an electric motor driving control means, 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, and the offset correcting means has first and second input portions, and the driving electric current detecting signal is inputted to said first input portion, and input means for inputting a driving electric current offset signal representing the driving electric current offset value Ioff is connected to said second input portion, inputting the driving electric current offset signal representing the driving electric current offset value Ioff to said offset correcting means through said input means by a driving electric current measuring means, said driving electric current measuring means outputs an offset driving current signal representing the driving electric current offset value Ioff with accuracy higher than that of said driving electric current detecting means, and as a result, the corrected driving electric current signal is generated by using the driving electric current detecting signal detected by said electric current detecting means and the offset driving current signal with accuracy higher than that of said electric current detecting means outputted by said driving electric current measuring means.