Method of detecting undersized, oversized, underinflated or overinflated tires
First Claim
1. A method of detecting an anomalous tire on a motor vehicle comprising the steps of:
- providing a wheel speed sensor at each wheel of such vehicle, providing a steering angle sensor, sensing the rotational speed of each wheel and an angle of deflection of a steering component of such vehicle, calculating a nominal vehicle speed and an expected rotational speed for each vehicle wheel based upon said sensed rotational speeds and said steering angle, calculating the effective diameter of each tire based upon said rotational speeds and said vehicle speed, and determining whether each effective diameter of each tire is within an a predetermined limit.
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Accused Products
Abstract
A method of detecting the presence of an undersized, e.g., mini-spare, or an underinflated, oversized or overinflated tire or tires on a passenger motor vehicle improves operation of traction control, stability and anti-lock brake systems by compensating for such operating anomalies. The method includes the steps of sensing the steering angle, sensing the actual rotational speeds of each wheel, determining the actual vehicle speed, calculating each expected wheel speed based upon the sensed steering angle and wheel speeds, calculating each tire diameter based upon the calculated wheel speeds and, finally, determining whether such diameters are within various defined ranges which permit normal operation, permit reduced function operation, or require system shut down.
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Citations
20 Claims
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1. A method of detecting an anomalous tire on a motor vehicle comprising the steps of:
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providing a wheel speed sensor at each wheel of such vehicle, providing a steering angle sensor, sensing the rotational speed of each wheel and an angle of deflection of a steering component of such vehicle, calculating a nominal vehicle speed and an expected rotational speed for each vehicle wheel based upon said sensed rotational speeds and said steering angle, calculating the effective diameter of each tire based upon said rotational speeds and said vehicle speed, and determining whether each effective diameter of each tire is within an a predetermined limit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of detecting at least one non-standard sized tire on a four wheel motor vehicle comprising the steps of:
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sensing the speed of rotation of each tire, sensing an angle of deflection of a steering component of such vehicle, calculating a vehicle speed by averaging at least two of said tire speeds, calculating an expected rotational speed for each tire based upon said sensed rotational speeds and said sensed angle of deflection, calculating an operating diameter of each tire based upon said rotational speeds and said vehicle speed, and determining whether each operating diameter of each tire is within one of at least two predetermined ranges. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method of detecting a nonstandard tire on a motor vehicle comprising the steps of:
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sensing the angular velocity of each tire and wheel assembly, sensing an angle of deflection of a steering component, determining a vehicle speed by averaging at least two sensed angular velocities, determining an expected angular velocity of each tire and wheel assembly based on said vehicle speed and said angle of deflection, determining the effective diameter of each tire and wheel assembly and whether any of said effective diameters is outside a predetermined allowance. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification