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Technical Briefs

A New Control Strategy to Reduce Steering Torque Without Perceptible Vibration for Vehicles Equipped With Electric Power Steering

[+] Author and Article Information
Masahiko Kurishige

Advanced Technology R and D Center, Mitsubishi Electric Corp., Tsukaguchi-Honmachi 8-1-1, Amagasaki, Hyogo 661-8661, Japankurishige.masahiko@bp.mitsubishielectric.co.jp

Osamu Nishihara, Hiromitsu Kumamoto

Graduate School of Informatics, Kyoto University, 36-1 Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan

J. Vib. Acoust 132(5), 054504 (Sep 01, 2010) (5 pages) doi:10.1115/1.4001838 History: Received January 19, 2009; Revised May 01, 2010; Published September 01, 2010; Online September 01, 2010

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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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Steering mechanism equipped with EPS

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Figure 3

Block diagram of an EPS system

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Figure 4

Open loop characteristics of the EPS system

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Figure 5

Open loop characteristics with and without pinion angular velocity control

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Figure 6

Closed loop characteristics with and without pinion angular velocity control

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Figure 7

Gain characteristics from i to θsw and θc

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Figure 8

Estimation results for the pinion angular velocity

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Figure 9

Proposed EPS controller

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Figure 10

Experimental results using the conventional controller

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Figure 11

Experimental results using the proposed controller

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