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

1993-07-02

1998-11-17

Tong, Nina

Communications: electrical

Land vehicle alarms or indicators

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

340442, 731462, 731465, B60C 2300

Patent

active

058382305

ABSTRACT:
A method of detecting a deflated tire on a vehicle by comparing the rolling radii of the tires by means of comparing angular velocity speed signals from wheel speed sensors one at each wheel characterized by calculating an error value (DEL') where and C4 are angular velocity values for left-hand front, right-hand front, left-hand rear and right-hand rear wheels of the vehicle respectively, determining a correction factor LAT, calculating a corrected error value DEL wherein in the case that the sign of the product LAT.times.A of the correction factor LAT and the vehicle related constant A is opposite to the sign of the error value DEL' then the corrected error value DEL is given by DEL=DEL', and in the case that the product LAT.times.A and the error value DEL' have the same sign but the product LAT.times.A is greater in absolute magnitude then the error value DEL' the corrected error value DEL is given by DEL=0, otherwise the corrected error value DEL is given by DEL=DEL'-(LAT.times.A) and a tire warning indicator is operated in the vehicle to indicate that at least one tire is deflected when it is sensed that the magnitude of the corrected error value DEL is in the range 0.05 to 0.5.

REFERENCES:
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patent: 5218862 (1993-06-01), Hurrell, II et al.
patent: 5239469 (1993-08-01), Walker et al.
patent: 5248952 (1993-09-01), Walker et al.
patent: 5252946 (1993-10-01), Walker et al.
patent: 5263524 (1993-11-01), Boardman
patent: 5589816 (1996-12-01), Jones

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