Method of detecting a deflated tire on a vehicle
First Claim
1. A method of detecting a deflated tire on a vehicle comprising the steps of:
- rotating tires of the vehicle;
providing one wheel sensor for each of the tires;
detecting angular velocity speed of the tires by the wheel sensors;
calculating corrected wheel speed signals for each of the second, third and fourth wheels giving corrections for a set of factors comprising vehicle speed, lateral acceleration and longitudinal (fore/aft) acceleration, the corrections each comprising a constant for the factor concerned times the respective factor, the set of constants for each wheel being derived by taking the vehicle through a range of speeds, lateral and fore/aft accelerations and using multiple regression techniques and the respective factors being calculated from the set of uncorrected wheel speed signals so that comparison of the wheel speeds can be made without false signals from tire deflections caused by speed, lateral or fore/aft acceleration induced tire deflections;
comparing the angular velocity speed signals from the wheel speed sensors;
comparing the rolling radii of the tires by the comparing of the angular velocity speed signals; and
issuing a warning signal when at least one of the tires is determined to be at least partially deflated from differences in the rolling radii of the tires.
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Accused Products
Abstract
A method of detecting a deflated tire on a vehicle by comparing the rolling radii of the tires by comparing angular velocity speed signals from wheel speed sensors. One wheel speed sensor being provided at each wheel. Before the comparison of the signals is carried out, corrected wheel speed signals for each of the second, third and fourth wheels are calculated giving corrections for a set of factors comprising vehicle speed, lateral acceleration and longitudinal (fore/aft) acceleration. The corrections each comprise a constant for the factor concerned times the respective factor. The set of constants for each wheel is derived by taking the vehicle through a range of speeds, lateral and fore/aft accelerations and using multiple regression techniques and the respective factors are calculated from the set of uncorrected wheel speed signals so that comparison of the wheel speeds can be made without false signals from tire deflections caused by speed, lateral or fore/aft acceleration induced tire deflections.
31 Citations
11 Claims
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1. A method of detecting a deflated tire on a vehicle comprising the steps of:
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rotating tires of the vehicle; providing one wheel sensor for each of the tires; detecting angular velocity speed of the tires by the wheel sensors; calculating corrected wheel speed signals for each of the second, third and fourth wheels giving corrections for a set of factors comprising vehicle speed, lateral acceleration and longitudinal (fore/aft) acceleration, the corrections each comprising a constant for the factor concerned times the respective factor, the set of constants for each wheel being derived by taking the vehicle through a range of speeds, lateral and fore/aft accelerations and using multiple regression techniques and the respective factors being calculated from the set of uncorrected wheel speed signals so that comparison of the wheel speeds can be made without false signals from tire deflections caused by speed, lateral or fore/aft acceleration induced tire deflections; comparing the angular velocity speed signals from the wheel speed sensors; comparing the rolling radii of the tires by the comparing of the angular velocity speed signals; and issuing a warning signal when at least one of the tires is determined to be at least partially deflated from differences in the rolling radii of the tires. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification