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 Title: |
US5878360:
Electric power steering control apparatus
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Nishino, Kazuhisa; Himeji, Japan
Takatsuka, Yuji; Himeji, Japan
Wada, Shunichi; Himeji, Japan
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| Assignee: |
Mitsubishi Denki Kabushiki Kaisha, Tokyo, Japan
other patents from MITSUBISHI DENKI KABUSHIKI KAISHA (379245) (approx. 20,162)
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| Published / Filed: |
1999-03-02
/ 1995-06-07
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| Application Number: |
US1995000474653
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| IPC Code: |
Advanced:
B62D 5/04;
B62D 6/00;
Core:
more...
IPC-7:
B62D 5/04;
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| ECLA Code: |
B62D5/04P2D;
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| U.S. Class: |
Current:
701/041;
180/412;
180/443;
180/446;
Original:
701/041;
180/443;
180/446;
180/412;
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| Field of Search: |
364/44.051,424.052
180/6.28,443,446,412,413,415,421,422,423,444
701/041,42
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| Priority Number: |
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| Abstract: |
An electric power steering control apparatus is intended to improve the convergence and control stability of a returning motion of a steering wheel when a driver of a vehicle on which the apparatus is installed lets his or her hands free from the steering wheel, and to reduce a burden to the driver when an excessive steering torque occurs during the returning motion. The apparatus includes a steering torque sensor 8 for detecting a steering torque of a steering system of the vehicle, a motor rotational-speed detector 7 for detecting a rotational speed of the electric motor, and a rotational-speed controller for controlling the electric motor based on output signals from the steering torque sensor and the motor rotational-speed sensor so that when the steering torque as detected is less than a predetermined torque value, the rotational speed of the electric motor does not exceed a predetermined speed value corresponding to the predetermined torque value.
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| Attorney, Agent or Firm: |
Sughrue, Mion, Zinn, Macpeak & Seas, PLLC ;
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| Primary / Asst. Examiners: |
Chin, Gary;
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Family: |
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First Claim:
Show all 4 claims |
What is claimed is:
1. An electric power steering control apparatus comprising:
- a steering torque sensor for detecting a steering torque of a steering system of a vehicle and generating a corresponding output signal;
- a D.C. motor having a pair of terminals for generating a power assisting force to reduce a steering force of a driver of the vehicle required to be imparted to said steering system;
- motor drive means for driving said electric motor in a direction of reducing said driver's steering force according to at least the output signal of said steering torque sensor;
- motor rotational-speed estimating means for estimating the rotational speed of said motor from an electromotive force generated when the terminals of said D.C. motor are opened; and
- control means for alternatively operating said motor drive means to drive said motor and said motor rotational-speed estimating means to estimate the motor-rotational speed when said steering torque is less than a predetermined torque value, so that said estimated rotational speed of said motor does not exceed a predetermined speed value.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 13 U.S. patent(s) that reference this one
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