Electricity: motive power systems – Constant motor current – load and/or torque control
Reexamination Certificate
2007-09-04
2007-09-04
Ip, Paul (Department: 2837)
Electricity: motive power systems
Constant motor current, load and/or torque control
C318S609000, C180S443000, C180S446000
Reexamination Certificate
active
11181859
ABSTRACT:
The present invention provides an excellent electric power steering apparatus in which torque ripple caused by a quantization error of a current control system generated in case of slow steering state and steering holding state, namely, vibration and noise on a steering wheel can be suppressed. A current controller in which a steady state gain of feedback control is a finite value is used so as to be capable of suppressing the vibration and noise. Further, according to the present invention, a smoothing filter is included in a current control system so that the quantization error is smoothed so that the torque ripple is suppressed.
REFERENCES:
patent: 5189620 (1993-02-01), Parsons et al.
patent: 5257828 (1993-11-01), Miller et al.
patent: 5475289 (1995-12-01), McLaughlin et al.
patent: 5581167 (1996-12-01), Kato et al.
patent: 5691615 (1997-11-01), Kato et al.
patent: 6308123 (2001-10-01), Ikegaya et al.
patent: 6324452 (2001-11-01), Ikegaya
patent: 6938725 (2005-09-01), Fujioka et al.
patent: 6983818 (2006-01-01), Fujioka et al.
patent: 7086496 (2006-08-01), Kodama
patent: 7091684 (2006-08-01), Kobayashi et al.
patent: 2004/0239280 (2004-12-01), Zhang et al.
patent: 2005/0039971 (2005-02-01), Fujioka et al.
patent: 2005/0103561 (2005-05-01), Endo et al.
patent: 2005/0116677 (2005-06-01), Tsuruta et al.
patent: 2005/0149341 (2005-07-01), Eguchi et al.
patent: 2005/0200327 (2005-09-01), Ikeda et al.
patent: 2005/0230180 (2005-10-01), Kodama
patent: 2006/0208683 (2006-09-01), Ide
patent: 709 277 (1996-05-01), None
patent: 943 527 (1999-09-01), None
patent: 1 072 498 (2001-01-01), None
patent: 2 367 543 (2002-04-01), None
patent: 2000-108916 (2000-04-01), None
Aoki Yuho
Endo Shuji
Kovudhikulrungsri Lilit
Mori Kenji
Nejo Sakae
Ip Paul
NSK Ltd.
Sughrue & Mion, PLLC
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