| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric power steering apparatus which stabilizes a steering assist characteristic by correcting the dispersion of the output characteristic attributable to the individual difference of an electric motor. SOLUTION: The electric power steering apparatus 10 comprises: a reference output characteristic memory 61 previously storing a reference output characteristic expressing a corresponding relation between a driving current of an electric motor 20 and an output torque corresponding to the driving current; a correction coefficient computing circuit 70 computing a ratio TO/TM between an output torque TM of the electric motor 20 detected at a time of applying a predetermined current IM to the electric motor 20, and an output torque TO corresponding to the driving current IM in the reference output characteristic as an output correction coefficient; and a current control computing means 53 which calculates a corrected current control signal by multiplying a current control signal of the electric motor 20 computed on the basis of a steered condition of a vehicle by the output correction coefficient, and outputs a drive control signal based on the corrected current control signal to a motor driving means 43. COPYRIGHT: (C)2008,JPO&INPIT |
