Antiskid brake control system using kalman filtering
First Claim
1. A brake control system for controlling an amount of braking force applied to a wheel of a vehicle running on a surface, comprising:
- a sensor for measuring a speed of the wheel and for providing an output signal indicative of the speed; and
a controller, operatively coupled to the sensor, which implements a Kalman filter to estimate an amplitude and location of a peak in a mu-slip curve representative of a coefficient of friction between the wheel and the surface based on the output signal of the sensor, and which controls the amount of braking force applied to the wheel based on the amplitude and location of the peak.
1 Assignment
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Accused Products
Abstract
A brake control system for controlling an amount of braking force applied to a wheel of a vehicle running on a surface, comprising a sensor for measuring a speed of the wheel and for providing an output signal indicative of the speed; and a controller, operatively coupled to the sensor, which implements a Kalman filter to estimate an amplitude and location of a peak in a mu-slip curve representative of a coefficient of friction between the wheel and the surface based on the output signal of the sensor, and which controls the amount of braking force applied to the wheel based on the amplitude and location of the peak.
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Citations
55 Claims
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1. A brake control system for controlling an amount of braking force applied to a wheel of a vehicle running on a surface, comprising:
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a sensor for measuring a speed of the wheel and for providing an output signal indicative of the speed; and a controller, operatively coupled to the sensor, which implements a Kalman filter to estimate an amplitude and location of a peak in a mu-slip curve representative of a coefficient of friction between the wheel and the surface based on the output signal of the sensor, and which controls the amount of braking force applied to the wheel based on the amplitude and location of the peak. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 38, 39, 40, 42)
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22. A brake control system for controlling an amount of braking force applied to a wheel of a vehicle running on a surface, comprising:
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a sensor for measuring a speed of the wheel; and a controller, operatively coupled to the sensor, which implements a state estimator to estimate an amplitude and location of a peak in a mu-slip curve representative of a coefficient of friction between the wheel and the surface based on an output of the sensor, and which controls the amount of braking force applied to the wheel based on the amplitude and location of the peak. - View Dependent Claims (23, 24, 25, 41)
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26. A brake control system for controlling an amount of braking force applied to a wheel of a vehicle running on a surface, comprising:
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a sensor for measuring a speed of the wheel; and a controller, operatively coupled to the sensor, for estimating a location of a peak in a mu-slip curve representative of a coefficient of friction between the wheel and the surface based on an output of the sensor, and for controlling the amount of braking force applied to the wheel so as to maintain a slip ratio with respect to the velocity of the wheel compared to a velocity of the vehicle at or near the location of the peak in the mu-slip curve without tending to exceed the location of the peak. - View Dependent Claims (27)
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28. A brake control system for controlling an amount of braking force applied to a wheel of a vehicle running on a surface, comprising:
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a sensor for measuring a speed of the wheel and for providing an output signal indicative of the speed; and a controller, operatively coupled to the sensor, which implements a Kalman filter to estimate at least one parameter of a mu-slip curve representative of a coefficient of friction between the wheel and the surface based on the output signal of the sensor, and controls the amount of braking force applied to the wheel based on the estimated parameter; wherein the controller is configured to reset a covariance associated with the at least one parameter in the Kalman filter upon detection of a skid condition between the wheel and the surface. - View Dependent Claims (29, 47, 48)
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30. A brake control system for controlling an amount of braking force applied to a wheel of a vehicle running on a surface, comprising:
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a sensor for measuring a speed of the wheel and for providing an output signal indicative of the speed; and a controller, operatively coupled to the sensor, which implements a Kalman filter to estimate at least one parameter of a mu-slip curve representative of a coefficient of friction between the wheel and the surface based on the output signal of the sensor, and controls the amount of braking force applied to the wheel based on the estimated parameter; wherein the controller is configured to employ an adjustable amount of control gain in controlling the amount of braking based on the estimated parameter. - View Dependent Claims (31, 32)
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33. A brake control system for controlling an amount of braking force applied to a wheel of a vehicle running on a surface, comprising:
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a sensor for measuring a speed of the wheel; and a controller, operatively coupled to the sensor, which implements a state estimator to estimate at least one parameter of a mu-slip curve representative of a coefficient of friction between the wheel and the surface based on an output of the sensor, and which controls the amount of braking force applied to the wheel based on the at least one parameter; wherein the amount of braking force is determined at least in part by a predefined mathematical function comprising a periodic component for increasing an ability of the state estimator to observe the at least one parameter. - View Dependent Claims (34, 35, 36)
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37. A method for controlling an amount of braking force applied to a wheel of a vehicle running on a surface, comprising:
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measuring a speed of the wheel and for providing an output signal indicative of the speed; and using Kalman filter techniques to estimate an amplitude and location of a peak in a mu-slip curve representative of a coefficient of friction between the wheel and the surface based on the output signal of the sensor, and controlling the amount of braking force applied to the wheel based on the amplitude and location of the peak.
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43. A brake control system for controlling an amount of braking force applied to a wheel of a vehicle running on a surface, comprising:
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a sensor for measuring a speed of the wheel; and a controller, operatively coupled to the sensor, which implements a state estimator to estimate at least one parameter of a mu-slip curve representative of a coefficient of friction between the wheel and the surface based on an output of the sensor, and which controls the amount of braking force applied to the wheel based on the at least one parameter; wherein the state estimator initializes the at least one parameter by setting the at least one parameter to an initial value which is predetermined to be greater than an expected true value of the at least one parameter. - View Dependent Claims (44, 45)
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46. A brake control system for controlling an amount of braking force applied to a wheel of a vehicle running on a surface, comprising:
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a sensor for measuring a speed of the wheel; and a controller, operatively coupled to the sensor, for estimating a location of a peak in a mu-slip curve representative of a coefficient of friction between the wheel and the surface based on an output of the sensor, and for controlling the amount of braking force applied to the wheel based on an operating point biased towards maintaining a slip ratio with respect to the speed of the wheel compared to a velocity of the vehicle, below the location of the peak in the mu-slip curve.
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49. A method for controlling rotation of a wheel of a vehicle running on a surface, comprising:
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measuring a speed of the wheel with a sensor to provide an output signal indicative of the speed; applying a state estimator to the output signal of the sensor to estimate an amplitude and location of a peak in a mu-slip curve representative of a coefficient of friction between the wheel and the surface; and controlling the rotation of the wheel relative to the surface based on the amplitude and location of the peak. - View Dependent Claims (50, 51)
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52. A method for controlling rotation of a wheel of a vehicle running on a surface, comprising:
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measuring a speed of the wheel with a sensor to provide an output signal indicative of the speed; estimating a location of a peak in a mu-slip curve representative of a coefficient of friction between the wheel and the surface based on the output signal of the sensor, and controlling the rotation of the wheel relative to the surface to maintain a slip ratio with respect to the speed of the wheel compared to a velocity of the vehicle at or near the location of the peak in the mu-slip curve without tending to exceed the location of the peak.
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53. A method for controlling rotation of a wheel of a vehicle running on a surface, comprising:
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measuring a speed of the wheel with a sensor to provide an output signal indicative of the speed; estimating a location of a peak in a mu-slip curve representative of a coefficient of friction between the wheel and the surface based on the output signal of the sensor, and controlling the rotation of the wheel relative to the surface based on an operating point biased towards maintaining a slip ratio with respect to the speed of the wheel compared to a velocity of the vehicle, below the location of the peak in the mu-slip curve. - View Dependent Claims (54, 55)
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Specification