Electric power steering device and control method utilized for controlling said electric power steering device

A control method for controlling an electric power steering device for applying a steerage assisting power to the steering mechanism of a vehicle by driving an electric motor in accordance with a steering torque given by operation means for steering said vehicle, said control method comprising:

• detecting said steering torque;
• setting as a target value the value of an electric current to be fed to said electric motor;
• and
• feedback-controlling said electric motor on the basis of a current deviation between said current target value and the current to flow through said electric motor,
• wherein said setting said value of said electric current includes:
• accepting said steering torque from said torque sensor, to set a basic assist current value for determining a current to be fed to said electric motor, on the basis of the steering torque accepted;
• and
• performing the phase compensation of said basic assist current value, to output the value of the current to be fed to said electric motor.

An electric power steering device for applying a steerage assisting power to the steering mechanism of a vehicle by driving an electric motor in accordance with a steering torque given by operation means for steering said vehicle, said power steering device comprising:

• a target value setting unit for setting as a target value the value of an electric current to be fed to said electric motor, wherein said target value setting unit includes:
• a basic assist current setting unit for accepting the steering torque, to set a basic assist current value for determining a current to be fed to said electric motor, on the basis of the steering torque accepted;
• and
• a phase compensating unit for performing the phase compensation of said basic assist current value, to output the value of the current to be fed to said electric motor,
• whereby said target value setting unit is usable with a control unit for feedback-controlling said electric motor on the basis of a current deviation between said current target value and the current to flow through said electric motor.