Transponder system for communicating with a vehicle tire

Details Transponder system for communicating with a vehicle tire Transponder system for communicating with a vehicle tire

1993-12-22

1996-07-30

Crosland, Donnie L.

Communications: electrical

Land vehicle alarms or indicators

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

340442, 340445, 731465, B60C 2300

Patent

active

055415741

ABSTRACT:
A tire transponder system seats a transponder coil in a flexible resilient tube that is positioned around a vehicle wheel. The transponder antenna is lodged in a groove that extends around the tube, and responds to an excitation signal by transmitting a signal that contains identification information and/or information on the tire condition. For tire condition information, a diode is connected in circuit with the transponder coil to double the frequency of the signal returned by the transponder. A switch that is connected to bypass the diode is operated by a tire condition sensor, such as a pressure sensor, when the sensed condition crosses a threshold level in a predetermined direction. The change in the frequency of the transponder's returned signal when the threshold has been crossed is used to activate a response such as a low tire pressure alarm.

REFERENCES:
patent: 4063229 (1977-12-01), Welsh et al.
patent: 4074227 (1978-02-01), Kalmus
patent: 4319220 (1982-03-01), Pappas et al.
patent: 4409586 (1983-10-01), Hochstein
patent: 4507956 (1985-04-01), Schlesinger et al.
patent: 4730188 (1988-03-01), Milheiser
patent: 4953393 (1990-09-01), Galasko et al.
patent: 5196845 (1993-03-01), Myatt
patent: 5218861 (1993-06-01), Brown et al.

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