System to measure wheel liftoff
First Claim
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1. A method of determining wheel departure from a road comprising:
- measuring the wheel speed of four wheels;
calculating a resonance frequency of the four wheels based at least in part on wheel speed;
calculating variations in the amplitude of the resonance frequency;
comparing the variations in the amplitude of the resonance frequency with a threshold;
indicating a complete lift-off condition of a wheel from the road if the variations exceed a threshold, the wheel being lifted off of a contact surface leaving an air gap between the wheel and the contact surface in the lift-off condition; and
determining and providing a wheel lift status condition that provides whether the complete lift-off condition is no-wheel lift, single-wheel lift, two-wheel lift or single-wheel lift. with impending two-wheel lift.
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Abstract
The present invention is directed to a system for determining lift-off or wheel departure of one or more wheels associated with a vehicle from a road. The system includes a sensor that measures the wheel speed of at least one wheel, and a controller that calculates the resonance frequency of the at least one wheel, calculates variations in the resonance frequency, compares the variations with a threshold, and indicates lift-off of the wheel from the road if the variations exceed a threshold.
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Citations
20 Claims
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1. A method of determining wheel departure from a road comprising:
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measuring the wheel speed of four wheels; calculating a resonance frequency of the four wheels based at least in part on wheel speed; calculating variations in the amplitude of the resonance frequency; comparing the variations in the amplitude of the resonance frequency with a threshold; indicating a complete lift-off condition of a wheel from the road if the variations exceed a threshold, the wheel being lifted off of a contact surface leaving an air gap between the wheel and the contact surface in the lift-off condition; and determining and providing a wheel lift status condition that provides whether the complete lift-off condition is no-wheel lift, single-wheel lift, two-wheel lift or single-wheel lift. with impending two-wheel lift. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17)
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11. A system for determining wheel departure from a road comprising:
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a sensor that measures the wheel speed of four wheels; and a controller that calculates a resonance frequency of the wheels based at least in part on the wheel speed, calculates variations in the amplitude of the resonance frequency, compares the variations with a threshold to determine whether a complete lift-off condition of the wheel from the road occurred, and whether the complete lift-off condition is no-wheel lift, single-wheel lift, two-wheel lift or single-wheel lift with impending two-wheel lift and indicates the specific lift-off condition if the variations exceed the threshold. - View Dependent Claims (18, 19, 20)
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Specification