Methods and apparatus for assessing tire health through monitoring effective tire rolling radius
First Claim
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1. A method comprising:
- obtaining velocity data for a vehicle from a global positioning system;
obtaining angular speed data for a wheel of the vehicle from a wheel speed sensor;
processing the velocity data and the angular speed data using a digital filter;
determining an effective rolling radius of a tire coupled to the wheel based on the processed velocity data and angular speed data;
determining an unloaded radius of the tire based on the effective rolling radius;
synchronizing the velocity data and the angular speed data prior to determining the effective rolling radius of the tire, wherein synchronizing the velocity data and the angular speed data includes time shifting the angular speed data based on a latency of global positioning system data;
determining a condition of the tire based on the effective rolling radius; and
indicating the condition of the tire to a driver via a display of the vehicle.
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Abstract
Methods and apparatus for assessing tire health through monitoring an effective tire rolling radius are disclosed. An example method includes obtaining velocity data for a vehicle from a global positioning system, obtaining angular speed data for a wheel of the vehicle, processing the velocity data and the angular speed data using a digital filter, and determining an effective rolling radius of a tire coupled to the wheel based on the processed velocity data and angular speed data.
14 Citations
11 Claims
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1. A method comprising:
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obtaining velocity data for a vehicle from a global positioning system; obtaining angular speed data for a wheel of the vehicle from a wheel speed sensor; processing the velocity data and the angular speed data using a digital filter; determining an effective rolling radius of a tire coupled to the wheel based on the processed velocity data and angular speed data; determining an unloaded radius of the tire based on the effective rolling radius; synchronizing the velocity data and the angular speed data prior to determining the effective rolling radius of the tire, wherein synchronizing the velocity data and the angular speed data includes time shifting the angular speed data based on a latency of global positioning system data; determining a condition of the tire based on the effective rolling radius; and indicating the condition of the tire to a driver via a display of the vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus comprising:
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a global positioning system module; a wheel speed sensor; a processor to; obtain velocity data for a vehicle from the global positioning system module; obtain angular speed data for a wheel of the vehicle from the wheel speed sensor; process the velocity data and the angular speed data using a linear estimation filter; determine an effective rolling radius based on the processed velocity data and angular speed data; determine an unloaded radius of a tire of the wheel based on the effective rolling radius; synchronize the velocity data and the angular speed data prior to determining the effective rolling radius of the tire by time shifting the angular speed data based on a latency of global positioning system data; and determine a condition of a tire based on the effective rolling radius; and
a display, wherein the condition of the tire is indicated to a driver via the display. - View Dependent Claims (11)
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Specification