Deceleration based antiskid brake contoller with adaptive deceleration threshold
First Claim
1. An antiskid brake controller for controlling a braking operation of a wheel of a vehicle based on a wheel speed signal provided by a wheel speed sensor coupled to the wheel, the controller comprising:
- means for estimating a deceleration of the wheel based on the wheel speed signal provided by the wheel speed sensor;
comparison means for comparing the estimated deceleration of the wheel with a predefined deceleration threshold adaptive to braking conditions, the predefined deceleration threshold being adaptive to braking conditions by increasing or decreasing in increments which vary in size as a function of a difference between the estimated deceleration and the predefined deceleration threshold; and
output means for providing a control signal for adjusting a brake force applied to the wheel based on the comparison, the control signal functioning to decrease the brake force applied to the wheel at a rate which is greater than a rate at which the control signal increases the brake force applied to the wheel.
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Accused Products
Abstract
An antiskid brake controller which utilizes measured wheel speed in order to provide brake control for a vehicle such as an aircraft. The measured wheel speed is differentiated to determine the deceleration of the wheel, and the controller then compares the deceleration to a predefined deceleration threshold. If the wheel decelerates faster than the deceleration threshold, the controller reduces the command pressure provided to the brakes by a scaling factor. Full command pressure may eventually be applied otherwise. The controller is capable of operating based only on measured wheel speed.
57 Citations
43 Claims
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1. An antiskid brake controller for controlling a braking operation of a wheel of a vehicle based on a wheel speed signal provided by a wheel speed sensor coupled to the wheel, the controller comprising:
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means for estimating a deceleration of the wheel based on the wheel speed signal provided by the wheel speed sensor;
comparison means for comparing the estimated deceleration of the wheel with a predefined deceleration threshold adaptive to braking conditions, the predefined deceleration threshold being adaptive to braking conditions by increasing or decreasing in increments which vary in size as a function of a difference between the estimated deceleration and the predefined deceleration threshold; and
output means for providing a control signal for adjusting a brake force applied to the wheel based on the comparison, the control signal functioning to decrease the brake force applied to the wheel at a rate which is greater than a rate at which the control signal increases the brake force applied to the wheel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An antiskid brake controller for controlling a braking operation of a wheel of a vehicle based on a wheel speed signal provided by a wheel speed sensor coupled to the wheel, the controller comprising:
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means for estimating a deceleration of the wheel based on the wheel speed signal provided by the wheel speed sensor;
comparison means for comparing the estimated deceleration of the wheel with a predefined deceleration threshold adaptive to braking conditions wherein the predefined deceleration being adaptive to braking conditions by increasing or decreasing in increments which vary in size as a function of a difference between the estimated deceleration and the predefined deceleration threshold;
output means for providing a control signal for adjusting a brake force applied to the wheel based on the comparison, the control signal functioning to decrease the brake force applied to the wheel at a rate which is greater than a rate at which the control signal increases the brake force applied to the wheel; and
means for generating the predefined deceleration threshold, wherein the means for generating varies the predefined deceleration threshold using a scaling factor incorporating the measured wheel speed represented by the wheel speed signal.
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10. An antiskid brake controller for controlling a braking operation of a wheel of a vehicle based on a wheel speed signal provided by a wheel speed sensor coupled to the wheel, the controller comprising:
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means for estimating a deceleration of the wheel based on the wheel speed signal provided by the wheel speed sensor;
adaptive deceleration threshold means for providing a deceleration threshold which varies in accordance with a prescribed criteria, whereby the deceleration threshold increases or decreases in increments which vary in size as a function of a difference between the estimated deceleration and the predefined deceleration threshold;
comparison means for comparing the estimated deceleration of the wheel with the deceleration threshold; and
output means for providing a control signal for adjusting a brake force applied to the wheel based on the comparison. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An antiskid brake controller for controlling a braking operation of a wheel of a vehicle based on a wheel speed signal provided by a wheel speed sensor coupled to the wheel, the controller comprising:
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means for estimating a deceleration of the wheel based on the wheel speed signal provided by the wheel speed sensor;
adaptive deceleration threshold means for providing a deceleration threshold which varies in accordance with a prescribed criteria;
comparison means for comparing the estimated deceleration of the wheel with the deceleration threshold, wherein the deceleration threshold being adaptive to braking conditions by increasing or decreasing in increments which vary in size as a function of a difference between the estimated deceleration and the deceleration threshold; and
output means for providing a control signal for adjusting a brake force applied to the wheel based on the comparison, wherein the adaptive deceleration threshold means increases the deceleration threshold as a function of the measured wheel speed and multiplies a nominal deceleration threshold by a scaling factor including the measured wheel speed to obtain the deceleration threshold.
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17. A method for controlling a braking operation of a wheel of a vehicle based on a wheel speed signal provided by a wheel speed sensor coupled to the wheel, the method comprising the steps of:
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estimating a deceleration of the wheel based on the wheel speed signal provided by the wheel speed sensor;
comparing the estimated deceleration of the wheel with a predefined deceleration threshold adaptive to braking conditions, the predefined deceleration threshold being adaptive to braking conditions by increasing or decreasing in increments which vary in size as a function of a difference between the estimated deceleration and the predefined deceleration threshold; and
providing a control signal for adjusting a brake force applied to the wheel based on the comparison, the control signal functioning to decrease the brake force applied to the wheel at a rate which is greater than a rate at which the control signal increases the brake force applied to the wheel. - View Dependent Claims (18, 19, 20)
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21. A method for controlling a braking operation of a wheel of a vehicle based on a wheel speed signal provided by a wheel speed sensor coupled to the wheel, the method comprising the steps of:
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estimating a deceleration of the wheel based on the wheel speed signal provided by the wheel speed sensor;
providing a deceleration threshold which varies in accordance with a prescribed criteria, whereby the deceleration threshold increases or decreases in increments which vary in size as a function of a difference between the estimated deceleration and the predefined deceleration threshold;
comparing the estimated deceleration of the wheel with the deceleration threshold; and
providing a control signal for adjusting a brake force applied to the wheel based on the comparison. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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28. An antiskid brake controller for controlling a braking operation of a wheel of a vehicle based on a wheel speed signal provided by a wheel speed sensor coupled to the wheel, the controller comprising:
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circuitry which estimates a deceleration of the wheel based on the wheel speed signal provided by the wheel speed sensor;
circuitry which compares the estimated deceleration of the wheel with a predefined deceleration threshold adaptive to braking conditions, the predefined deceleration threshold being adaptive to braking conditions by increasing or decreasing in increments which vary in size as a function of a difference between the estimated deceleration and the predefined deceleration threshold; and
an output circuit which provides a control signal for adjusting a brake force applied to the wheel based on the comparison, the control signal functioning to decrease the brake force applied to the wheel at a rate which is greater than a rate at which the control signal increases the brake force applied to the wheel. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
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37. An antiskid brake controller for controlling a braking operation of a wheel of a vehicle based on a wheel speed signal provided by a wheel speed sensor coupled to the wheel, the controller comprising:
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circuitry which estimates a deceleration of the wheel based on the wheel speed signal provided by the wheel speed sensor;
threshold circuitry which provides a deceleration threshold which varies in accordance with a prescribed criteria, whereby the deceleration threshold increases or decreases in increments which vary in size as a function of a difference between the estimated deceleration and the predefined deceleration threshold;
circuitry which compares the estimated deceleration of the wheel with the deceleration threshold; and
an output circuit which provides a control signal for adjusting a brake force applied to the wheel based on the comparison. - View Dependent Claims (38, 39, 40, 41, 42, 43)
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Specification