Interrogating system for remotely monitoring tire air pressure

Details Interrogating system for remotely monitoring tire air pressure Interrogating system for remotely monitoring tire air pressure

1980-12-22

1982-12-07

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

731465, 200 6125, 343 68R, 343 65SS, B60C 2302, G01S 958

Patent

active

043630200

ABSTRACT:
The air pressure in a tire is monitored by transmitting an electromagnetic interrogating signal (specifically a radio frequency signal) from the vehicle to a passive transponder, affixed to the wheel on which the tire is mounted, in communication with the air pressure within the tire. When the pressure is normal, a semiconductor diode and an antenna in the transponder will be shielded from radiation and therefore no response will be made to the received interrogating signal. On the other hand, abnormal air pressure in the tire causes the antenna to become unshielded and exposed to the interrogating signal radiated from the transmitter, whereupon the diode reacts to the received signal and develops therefrom a response signal which is retransmitted from the antenna and includes, among other signal components, the second harmonic of the interrogating signal. A receiver, tuned to the second harmonic, produces from the response signal an indication (preferably on the vehicle's dashboard) that the sensed tire air pressure is abnormal.

REFERENCES:
patent: 3723966 (1973-03-01), Mueller et al.
patent: 3798642 (1974-03-01), Augenblick et al.
patent: 3806905 (1974-04-01), Strenglein
patent: 3873965 (1975-03-01), Garcia
patent: 3911434 (1975-10-01), Cook
patent: 4057783 (1977-11-01), Blanchier
patent: 4064482 (1977-12-01), Maiach et al.
patent: 4074227 (1978-02-01), Kalmus
patent: 4157530 (1979-06-01), Merz

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