Title:
ELECTRIC POWER STEERING DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/037981
Kind Code:
A1
Abstract:
[Problem] To provide an electric power steering device that has a plurality of dead time compensation functions that compensate inverter dead time and, without tuning work: switches dead time compensation functions and compensates, in accordance with a steering state; improves steering performance; improves current waveform distortion; improves current control responsiveness; and suppresses noise, vibration and ripples. [Solution] A vector control-type electric power steering device that: calculates a steering assistance command value for d and q axes on the basis of at least steering torque; calculates d and q axis current command values from the steering assistance command values; converts the d and q axis current command values to 3-phase Duty command values; drive controls a 3-phase brushless motor by using a PWM control inverter; and applies assistance torque to a vehicle steering mechanism. The electric power steering device has a plurality of dead time compensation functions having differing compensation performance on inverter dead time and performs dead time compensation by switching from one of the plurality of dead time compensation functions to another dead time compensation function, under prescribed conditions.
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/JP2017/029445
Publication Date:
March 01, 2018
Filing Date:
August 16, 2017
Export Citation:
Assignee:
NSK LTD (JP)
International Classes:
B62D6/00; B62D5/04; H02M7/48; H02M7/537; H02P21/22; H02P27/08; B62D119/00; B62D137/00
Domestic Patent References:
| WO2012169311A1 | 2012-12-13 |
Foreign References:
| JP2007253670A | 2007-10-04 | |||
| JP2007045394A | 2007-02-22 | |||
| JP2006199140A | 2006-08-03 | |||
| JP2006081260A | 2006-03-23 | |||
| US20150185095A1 | 2015-07-02 | |||
| JP2012011965A | 2012-01-19 | |||
| JP2010228701A | 2010-10-14 | |||
| JP2007091182A | 2007-04-12 | |||
| JP2004201414A | 2004-07-15 |
Other References:
See also references of EP 3476695A4
Attorney, Agent or Firm:
AGATA Yuzo (JP)
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