Adaptive steering control system
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United States of America Patent
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-
Nov 16, 1993
Grant Date -
N/A
app pub date -
Dec 18, 1991
filing date -
Jul 11, 1990
priority date (Note) -
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status (Latency Note)
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Abstract
The steering stability of a moving vehicle is maintained by measuring an actual yaw rate of the vehicle and determining a desired yaw rate of the vehicle and producing an output signal in response to a comparison of the actual and desired yaw rates. The steering angle of steerable wheels of the vehicle is controlled in response to the output signal in a manner tending to substantially conform the actual yaw rate to the desired yaw rate, thereby maintaining vehicle stability. The steerable wheels are steered by a steering wheel, and are independently steered by a motor in response to the output signal. The amount of steering provided by the motor is controlled in dependence upon an estimated frictional coefficient between the vehicle and the road, or upon detected values of the environmental temperature and precipitation.
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