Tire pressure warning system

Details Tire pressure warning system Tire pressure warning system

1985-06-14

1986-03-04

Crosland, Donnie L.

Communications: electrical

Selective

Having indication or alarm

34087011, 34087016, 340669, 116 34R, 731462, 731464, 200 6122, B60C 2300

Patent

active

045742677

ABSTRACT:
A tire inflation pressure detector which senses changes in tire pressure by detecting the changes in the spring rate of the tire which result from changes in tire pressure. An accelerometer (40) is mounted on a vehicle suspension component adjacent the tire. The accelerometer is sensitive to vertical accelerations experienced by the tire and provides a signal indicative thereof. A filter bank (64) processes the accelerometer signal so as to define the frequency distribution of the accelerometer output signal. A microcomputer (100) responds to the signals provided by the filters and locates the low frequency resonance peak whose position is influenced by the tire spring rate. The microcomputer determines whether tire pressure is low in accordance with the frequency of the resonance peak.

REFERENCES:
patent: 1974906 (1934-09-01), Willcox
patent: 2070743 (1937-02-01), McDonnell
patent: 2253118 (1941-08-01), Gillespie et al.
patent: 2957058 (1960-10-01), Trott
patent: 3588814 (1971-06-01), Furlong
patent: 3613075 (1971-10-01), Griffiths et al.
patent: 4149140 (1979-04-01), Evans et al.
patent: 4210898 (1980-07-01), Betts
SAE Paper #680,408, by Richard E. Rasmussen and Anthony D. Cortese, pp. 1412-1420.

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