Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle subsystem or accessory control
Reexamination Certificate
1999-09-10
2001-04-03
Nguyen, Tan (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Vehicle subsystem or accessory control
C180S443000, C701S028000
Reexamination Certificate
active
06212453
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a vehicle steering control system.
2. Description of the Related Art
Prior art references proposed by the assignee, including those made public by Japanese Laid-Open Patent Application Nos. Hei 5(1993)-197423 and Hei 9(1997)-221054, teach vehicle steering control system technologies that provide steering angle assistance for keeping the vehicle on a desired course of travel along a lane of a road.
By providing fine steering assistance while preventing vehicle lane wandering, these technologies greatly reduce the burden on the vehicle driver, which tends to increase particularly during long, high-speed driving on an expressway or the like.
In view of the interference or interaction between this type of steering assistance control and vehicle driver steering, the control should preferably be effected to provide assistance through torque (steering force) rather than steering angle.
However, when a lane-keeping-steering torque assist control of such type is conducted using an actuator such as an electric motor of a conventional power-steering torque assist control system such that both the lane-keeping-steering torque assist control and the power-steering torque assist control are conducted using the same actuator, there may be a case when the two kinds of control interfere with each other, thereby affecting the vehicle driver's perception of vehicle steering response.
SUMMARY OF THE INVENTION
An object of this invention is therefore to provide a vehicle steering control system which conducts the lane-keeping-steering torque assist control by using an actuator such as an electric motor of a conventional power-steering torque assist control system such that both the lane-keeping-steering torque assist control and the power-steering torque assist control are conducted using the same actuator, while effectively preventing the two kinds of control from interfering with each other so as not to adversely affect the vehicle driver's perception of vehicle steering response.
In order to achieve this object, there is provided a system for controlling steering of a vehicle, including: an actuator which steers driven wheels of the vehicle; 1st assist torque calculating means for calculating a first assist torque for causing the vehicle to run along a reference line of a road existing ahead of the vehicle; steering torque detecting means for detecting a steering torque inputted by a vehicle driver of the vehicle; 2nd assist torque calculating means for calculating a 2nd assist torque for assisting vehicle driver's steering of the vehicle in accordance with a predetermined characteristic based on the detected steering torque; manipulated variable calculating means for calculating a manipulated variable to be supplied to the actuator based on the calculated 1st and 2nd assist torques; assist torque correcting means for correcting the calculated 1st and 2nd assist torques based on at least the detected steering torque; and manipulated variable calculating means for calculating a manipulated variable to be supplied to the actuator based on the corrected 1st and 2nd assist torques.
REFERENCES:
patent: 4834203 (1989-05-01), Takahashi et al.
patent: 5481457 (1996-01-01), Yamamoto et al.
patent: 5845222 (1998-12-01), Yamamoto et al.
patent: 5913375 (1999-06-01), Nishikawa
patent: 5925082 (1999-07-01), Shimizu et al.
patent: 5-197423 (1993-08-01), None
patent: 9-221054 (1997-08-01), None
patent: 11-78948 (1999-03-01), None
Ishida Shinnosuke
Kawagoe Hiroyuki
Arent Fox Kintner & Plotkin & Kahn, PLLC
Honda Giken Kogyo Kabushiki Kaisha
Nguyen Tan
Tran Dalena
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