Title:
ELECTRIC POWER STEERING DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/016560
Kind Code:
A1
Abstract:
[Problem] To provide an electric power steering device of the vector control type which performs ideal inverter dead time compensation without requiring a tuning operation, improves current waveform distortion and improves current control responsiveness, exhibits a significant effect during low-speed steering, and suppresses noise, vibrations and ripples. [Solution] An electric power steering device of the vector control type which converts a dq-axis current command value calculated on the basis of at least the steering torque into a 3-phase Duty command value, drives and controls a 3-phase brushless motor using a PWM control inverter, and applies assist torque to the steering mechanism of the vehicle, wherein a 3-phase detection voltage is estimated on the basis of a 3-phase motor terminal voltage, loss voltage caused by inverter dead time is estimated from the difference between the 3-phase detection voltage and the 3-phase command voltage calculated from the 3-phase Duty command value, and dead time compensation is performed by feeding back the dead time compensation value used in loss voltage compensation to the dq-axis current command value. A compensation amount improvement unit may also be provided.
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Inventors:
TAKASE HIROAKI (JP)
MINAKI RYO (JP)
SAWADA HIDEKI (JP)
SUGAWARA TAKAYOSHI (JP)
MINAKI RYO (JP)
SAWADA HIDEKI (JP)
SUGAWARA TAKAYOSHI (JP)
Application Number:
PCT/JP2017/026204
Publication Date:
January 25, 2018
Filing Date:
July 20, 2017
Export Citation:
Assignee:
NSK LTD (JP)
International Classes:
H02P21/05; B62D5/04; B62D6/00; H02M7/48; H02P6/10
Foreign References:
| JP2010068662A | 2010-03-25 | |||
| JP2005229717A | 2005-08-25 | |||
| JPH10164850A | 1998-06-19 |
Other References:
See also references of EP 3460988A4
Attorney, Agent or Firm:
AGATA Yuzo (JP)
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