Method and system for adjusting headway in an adaptive speed control system based on road surface coefficient of friction
First Claim
1. In an adaptive speed control system for a vehicle, a method for automatically adjusting a selected following interval for the vehicle based on driving conditions, the method comprising:
- determining a driving surface coefficient of friction based on a driven wheel speed of the vehicle; and
adjusting the selected following interval for the vehicle based on the driving surface coefficient of friction, wherein adjusting the selected following interval comprises comparing the driving surface coefficient of friction to a coefficient of friction threshold; and
when the driving surface coefficient of friction is less than the coefficient of friction threshold, adjusting the selected following interval based on the difference between the coefficient of friction threshold and the driving surface coefficient of friction.
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Abstract
In an adaptive speed control system for a vehicle, a method and system for automatically adjusting a selected following interval for the vehicle based on driving conditions is provided. The method includes determining a driving surface coefficient of friction based on a driven wheel speed of the vehicle, and adjusting the selected following interval for the vehicle based on the driving surface coefficient of friction. The system includes a receiver capable of receiving a signal indicative of a driven wheel speed of the vehicle, and a controller capable of determining a driving surface coefficient of friction based on the driven wheel speed, and capable of adjusting the selected following interval for the vehicle based on the driving surface coefficient of friction.
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Citations
16 Claims
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1. In an adaptive speed control system for a vehicle, a method for automatically adjusting a selected following interval for the vehicle based on driving conditions, the method comprising:
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determining a driving surface coefficient of friction based on a driven wheel speed of the vehicle; and
adjusting the selected following interval for the vehicle based on the driving surface coefficient of friction, wherein adjusting the selected following interval comprises comparing the driving surface coefficient of friction to a coefficient of friction threshold; and
when the driving surface coefficient of friction is less than the coefficient of friction threshold, adjusting the selected following interval based on the difference between the coefficient of friction threshold and the driving surface coefficient of friction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
comparing the driving surface coefficient of friction to a deactivation coefficient of friction threshold; and
deactivating the adaptive speed control system when the driving surface coefficient of friction is less than the deactivation coefficient of friction threshold.
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8. The method of claim 1 wherein determining a driving surface coefficient of friction comprises calculating a driving surface coefficient of friction according to the equation:
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9. In an adaptive speed control system for a vehicle, a system for automatically adjusting a selected following interval for the vehicle based on driving conditions, the system comprising:
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a receiver capable of receiving a signal indicative of a driven wheel speed of the vehicle; and
a controller capable of determining a driving surface coefficient of friction based on the driven wheel speed, and adjusting the selected following interval for the vehicle based on the driving surface coefficient of friction, wherein, to adjust the selected following interval, the controller is capable of comparing the driving surface coefficient of friction to a coefficient of friction threshold and, when the driving surface coefficient of friction is less than the coefficient of friction threshold, adjusting the selected following interval based on a difference between the coefficient of friction threshold and the driving surface coefficient of friction. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification