Method of detecting a deflated tire on a vehicle
First Claim
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1. A method of detecting a deflated tire on a vehicle comprising the steps of:
- rotating tires of the vehicle, a front left-hand, a front right-hand, a rear left-hand and a rear right-hand wheel being provided;
providing one wheel sensor for each of the tires;
detecting angular velocity speed of the tires by the wheel sensors;
calculating factors ##EQU4## where C1, C2, C3 and C4 are signals for the speeds of the front left-hand, front right-hand, rear left-hand and rear right-hand wheels of the vehicle;
monitoring the factors; and
if the value of one or more factor becomes greater than 1.0005 or less than 0.9995, producing a warning signal to indicate that a tire has become at least partially deflated.
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Abstract
A method of detecting a deflated tire on a vehicle by comparing the rolling radii of the tires by comparing angular velocity signals from wheel speed sensors at each wheel comprising the steps of calculating the factors ##EQU1## where C1, C2, C3 and C4 are the signals for the speeds of the front left-hand, front right-hand, rear left-hand and rear right-hand wheels of the vehicle, monitoring these factors and if the value of one or more factor becomes greater than 1.0005 or less than 0.9995, producing a warning signal to indicate that a tire has become partially or completely deflated.
39 Citations
8 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, a front left-hand, a front right-hand, a rear left-hand and a rear right-hand wheel being provided; providing one wheel sensor for each of the tires; detecting angular velocity speed of the tires by the wheel sensors; calculating factors ##EQU4## where C1, C2, C3 and C4 are signals for the speeds of the front left-hand, front right-hand, rear left-hand and rear right-hand wheels of the vehicle; monitoring the factors; and if the value of one or more factor becomes greater than 1.0005 or less than 0.9995, producing a warning signal to indicate that a tire has become at least partially deflated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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6. The method according to claim 1, wherein the signals for the speeds are corrected relative to one another based on constants derived from straight line running of the vehicle at a single speed.
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7. The method according to claim 1, wherein the signals comprise multi-pulse electrical signals from each wheel, the signals also being useable for an anti-lock braking system.
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8. The method according to claim 1, wherein the signals comprise a single electrical pulse for each rotation of each wheel and the time period between successive pulses is used for the angular velocity value.
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Specification
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Current AssigneeSumitomo Rubber Industries Limited
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Original AssigneeSumitomo Rubber Industries Limited
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InventorsWalker, John C., Rehal, Lavinder S.
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Primary Examiner(s)WOODIEL, DONALD
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Application NumberUS07/802,215Time in Patent Office678 DaysField of Search73/146, 73/146.2, 73/146.3, 73/146.4, 73/146.5, 364/558, 364/565, 340/442, 340/444US Class Current340/444CPC Class CodesB60C 23/061 by monitoring wheel speed m...
