G - Physics – 08 – B
Patent
G - Physics
08
B
343/17, 340/95,
G08B 21/00 (2006.01) B60C 23/04 (2006.01)
Patent
CA 1174324
078182-BWL INTERROGATING SYSTEM FOR REMOTELY MONITORING TIRE AIR PRESSURE 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 (24) and an antenna (24a) in the transponder will be shielded (21) 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 (31-36), whereupon the diode reacts to the received signal and develops there- from a response signal which is retransmitted from the antenna and includes, among other signal components, the second harmonic of the interrogating signal. A receiver (31,37-42), 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.
392975
Borg-Warner Corporation
Macrae & Co.
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