Patent Number: 7,822,520

Title: Motor-driven power steering apparatus

Abstract: In a motor-driven power steering apparatus, there are provided a reference output characteristic memory previously storing a reference output characteristic expressing a corresponding relation between a driving current of an electric motor and an output torque corresponding to the driving current, a correction coefficient computing circuit computing a ratio TO/TM between an output torque TM of the electric motor detected at a time of applying a predetermined current M to the electric motor, and an output torque TO corresponding to the driving current IM in the reference output characteristic as an output correction coefficient. A current control computing unit calculates a corrected current control signal by multiplying a current control signal of the electric motor 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 unit.

Inventors: Takeuchi; Yoshinori (Tochigi, JP), Senda; Shunya (Tochigi, JP)

Assignee: Showa Corporation

International Classification: B62D 6/00 (20060101)

Expiration Date: 2018-10-26 0:00:00