Motor-driven power steering apparatus

Details Motor-driven power steering apparatus Motor-driven power steering apparatus

2007-03-09

2010-10-26

Nguyen, Kim T (Department: 3661)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Vehicle subsystem or accessory control

Reexamination Certificate

active

07822520

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.

REFERENCES:
patent: 6326753 (2001-12-01), Someya et al.
patent: 19943410 (2000-05-01), None
patent: 1308368 (2003-05-01), None
patent: 1452421 (2004-09-01), None
patent: HEI 6-8839 (1994-01-01), None

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