Electromotive power steering system

Details Electromotive power steering system Electromotive power steering system

2006-11-28

2006-11-28

Ip, Paul (Department: 2837)

Electricity: motive power systems

Constant motor current, load and/or torque control

C318S779000, C318S807000

Reexamination Certificate

active

07141948

ABSTRACT:
An objective is to provide, in a motor controller used for an electromotive power steering system, a concrete realistic method for easily performing abnormality judgments in its control system. The electromotive power steering system includes: a d-q command value setting unit for determining, for current to be applied to the motor, d-axis and q-axis current command values in a d-q coordinate system; a current detector for detecting a three-phase AC current actually flowing in the motor; a three-phase AC/d-q coordinate transformer for transforming the three-phase AC current detected by the current detector into a d-axis current detection value and a q-axis current detection value in the d-q coordinate system; a voltage controller for controlling a voltage applied to the motor, based on the d-axis current command value and the q-axis current command value, and on the d-axis current detection value and the q-axis current detection value; and an abnormality judging unit for judging, by either comparing the q-axis current command value with the q-axis current detection value, or comparing the d-axis current command value with the d-axis current detection value, whether a system-control abnormality has occurred.

REFERENCES:
patent: 4869333 (1989-09-01), Morishita et al.
patent: 6427105 (2002-07-01), Matsushita
patent: 6459972 (2002-10-01), Kodaka et al.
patent: 6700400 (2004-03-01), Atarashi
patent: 6801011 (2004-10-01), Ide
patent: 6906492 (2005-06-01), Matsushita
patent: 2003/0057913 (2003-03-01), Matsushita et al.
patent: 2003/0222612 (2003-12-01), Matsushita
patent: 0 241 853 (1987-10-01), None
patent: 0957572 (1999-11-01), None
patent: 8-322291 (1996-12-01), None
patent: 11-332002 (1999-11-01), None
patent: 2001-187578 (2001-07-01), None
patent: 2004-215390 (2004-07-01), None

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