This paper proposes a new electric power steering control strategy, which significantly reduces the effort needed to change the steering direction of stationary vehicles. Previous attempts to reduce undesirable steering vibration have failed to reduce the steering torque because high-assist gains tend to produce oscillation or increase noise sensitivity. Herein, to eliminate this vibration, a new control strategy was developed based on pinion angular velocity control using a newly developed observer based on a simplified steering model. Tests yielded excellent estimations of the pinion angular velocity, and this made it possible to eliminate vibration at all steering wheel rotation speeds. Experiments with a test vehicle confirmed significant steering torque reduction, over a wide range of steering wheel speeds, without vibration transmission to the driver. The proposed control strategy allowed use of an assist gain more than three times higher than is conventional. Additionally, the proposed control strategy does not require supplemental sensors.
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e-mail: kurishige.masahiko@bp.mitsubishielectric.co.jp
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October 2010
Technical Briefs
A New Control Strategy to Reduce Steering Torque Without Perceptible Vibration for Vehicles Equipped With Electric Power Steering
Masahiko Kurishige,
Masahiko Kurishige
Advanced Technology R and D Center,
e-mail: kurishige.masahiko@bp.mitsubishielectric.co.jp
Mitsubishi Electric Corp.
, Tsukaguchi-Honmachi 8-1-1, Amagasaki, Hyogo 661-8661, Japan
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Osamu Nishihara,
Osamu Nishihara
Graduate School of Informatics,
Kyoto University
, 36-1 Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan
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Hiromitsu Kumamoto
Hiromitsu Kumamoto
Graduate School of Informatics,
Kyoto University
, 36-1 Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan
Search for other works by this author on:
Masahiko Kurishige
Advanced Technology R and D Center,
Mitsubishi Electric Corp.
, Tsukaguchi-Honmachi 8-1-1, Amagasaki, Hyogo 661-8661, Japane-mail: kurishige.masahiko@bp.mitsubishielectric.co.jp
Osamu Nishihara
Graduate School of Informatics,
Kyoto University
, 36-1 Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan
Hiromitsu Kumamoto
Graduate School of Informatics,
Kyoto University
, 36-1 Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, JapanJ. Vib. Acoust. Oct 2010, 132(5): 054504 (5 pages)
Published Online: September 1, 2010
Article history
Received:
January 19, 2009
Revised:
May 1, 2010
Online:
September 1, 2010
Published:
September 1, 2010
Citation
Kurishige, M., Nishihara, O., and Kumamoto, H. (September 1, 2010). "A New Control Strategy to Reduce Steering Torque Without Perceptible Vibration for Vehicles Equipped With Electric Power Steering." ASME. J. Vib. Acoust. October 2010; 132(5): 054504. https://doi.org/10.1115/1.4001838
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