Electric power steering apparatus

Details Electric power steering apparatus Electric power steering apparatus

2005-08-09

2005-08-09

Masih, Karen (Department: 2837)

Electricity: motive power systems

Constant motor current, load and/or torque control

C318S434000, C318S433000

Reexamination Certificate

active

06927548

ABSTRACT:
An electric power steering apparatus includes: a rotation speed detecting unit which detects a rotation speed of the electric motor; a compensation current determining unit which determines an instruction value of a compensation current to flow through the electric motor to suppress torque ripples due to distortion of an induced electromotive force waveform of the electric motor in accordance with a load correspondence quantity as a physical quantity corresponding to a load of the electric motor and the rotation speed detected by the rotation speed detecting unit; a correcting unit which corrects the current target value on the basis of the compensation current instruction value; and a control unit which performs a feedback control on the electric motor so that a current having the current target value as corrected by the correcting unit flows through the electric motor.

REFERENCES:
patent: 6427104 (2002-07-01), Matsushita et al.
patent: 2003/0233997 (2003-12-01), Kawaguchi et al.
patent: 2004/0003957 (2004-01-01), Matsuoka et al.
patent: 1 308 368 (2003-05-01), None
patent: 11-191992 (1999-07-01), None
patent: 2001-186790 (2001-07-01), None
European Search Report dated Aug. 10, 2004.

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