Title:
ELECTRIC POWER STEERING APPARATUS
Document Type and Number:
WIPO Patent Application WO/2018/151291
Kind Code:
A1
Abstract:
[Problem] To provide an electric power steering apparatus capable of manual input determination with high accuracy, free of the influence of noise associated with a free vibration system, without being affected by disturbance. [Solution] An electric power steering apparatus, which controls the drive of a motor for applying an assist torque to the steering mechanism of a vehicle and has the function of switching between an assist mode and an autonomous mode, comprises: a torsion bar torsional angle calculation unit which calculates a torsion bar torsional angle on the basis of torque information; an output-side column shaft relative angle generation unit which outputs an output-side relative angle from a motor electrical angle signal; an actual steering wheel angle calculation unit which calculates an actual steering wheel angle on the basis of the torsion bar torsional angle and the output-side relative angle; a resonance filter which calculates, from the output-side relative angle, the estimated steering wheel angle when the hands are off the steering wheel; and a hands ON/OFF determination unit which, when the period during which the deviation angle between the actual steering wheel angle and the estimated steering wheel angle is a predetermined angle or more continues for a predetermined period 1 or more, determines that the hands are on the steering wheel.
Inventors:
SAWADA HIDEKI (JP)
FUJIWARA YUKIE (JP)
MINAKI RYO (JP)
SUGAWARA TAKAYOSHI (JP)
FUJIWARA YUKIE (JP)
MINAKI RYO (JP)
SUGAWARA TAKAYOSHI (JP)
Application Number:
PCT/JP2018/005705
Publication Date:
August 23, 2018
Filing Date:
February 19, 2018
Export Citation:
Assignee:
NSK LTD (JP)
International Classes:
B62D6/00; B62D5/04; B62D101/00; B62D113/00; B62D119/00
Foreign References:
| JPH1178953A | 1999-03-23 | |||
| JP2016088383A | 2016-05-23 | |||
| JP2016074356A | 2016-05-12 | |||
| JPH08337181A | 1996-12-24 | |||
| JPH11208498A | 1999-08-03 | |||
| JPH11208498A | 1999-08-03 |
Other References:
See also references of EP 3572303A4
Attorney, Agent or Firm:
AGATA Yuzo (JP)
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