Method of detecting a deflated tire on a vehicle

Details Method of detecting a deflated tire on a vehicle Method of detecting a deflated tire on a vehicle

1994-10-03

1996-07-30

Swarthout, Brent A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

731465, 340442, B60C 2300

Patent

active

055415733

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 C1, C2, C3, and C4 from wheel speed sensors, one on each wheel, comprising the steps of: calculating in normal driving an error value DEL' by processing the four angular velocity speed signals C1-C4 and expressing the result as a percentage of the mean of the sums, DEL'=(C1+C4-C2-C3).times.50/((C1+C2+C3+C4)/4); sensing when the magnitude of the error value DEL' is in the range 0.05 to 0.5 and when it is carrying out the step of deciding which tire is apparently deflated by comparison of the angular velocity speed signals C1-C4 with each other, calculating a wheel error value DEL'FAC(W) for each wheel W produced with the deflated tire by the method for DEL' in normal driving, where DEL'FAC=(C1+C4-C2-C3).times.50/ ((C1+C2+C3=C4)/4) and calculating the wheel factor FAC(W) for each wheel W by dividing the wheel error values DEL'FAC(W) for the wheels by the wheel error value DEL'FAC of one of the wheels, and calculating a standardized corrected error value STDDEL by dividing the error value DEL' by the wheel factor FAC(W) for the wheel having the tire which is apparently deflated and if the value of the standardized corrected error value STDDEL is in the range 0.05 to 0.5 operating a tire warning indicator to indicate that that particular tire is deflated.

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