Automatic tire pressure monitoring system

Details Automatic tire pressure monitoring system Automatic tire pressure monitoring system

1975-12-18

1979-06-05

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

731465, 200 6125, B60C 2304

Patent

active

041575300

ABSTRACT:
A pressure sensor connected to tire pressure and using a rolling diaphragm in an actuator having two effective operating diameters to provide a dead band corresponding to satisfactory pressure range adjusts a magnetic signal generating unit also mounted on the rotating wheel and having a ferro-magnetic shield to avoid effects of nearby magnetic materials on the field of a permanent magnet which is permitted to pass through windows in the shield to sweep selectively over two position biased magnetic sensors mounted on the vehicle chassis. The different signals of the two magnetic sensors are processed by electronics to reconstruct the pressure sensor position and display corresponding tire condition to the vehicle operator.

REFERENCES:
patent: 3614732 (1971-10-01), Lejeune
patent: 3665387 (1972-05-01), Enabnit
patent: 3781787 (1973-12-01), Sugiyama
patent: 3828309 (1974-08-01), Yamasaki et al.
patent: 3832681 (1974-08-01), Kaida et al.
patent: 3890595 (1975-06-01), Barabino
patent: 3924257 (1975-12-01), Roberts
patent: 3978448 (1976-08-01), Vago

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