Tire abnormality detecting device
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United States of America Patent
Stats
-
Apr 9, 1991
Grant Date -
N/A
app pub date -
Jun 29, 1989
filing date -
Jul 4, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A tire abnormality detecting device has a first unit to be provided on a vehicle body side and a second unit to be provided on a tire side. The first unit includes an electrical signal generating source for generating a specific electrical signal, a first coil device for generating an induction voltage in receipt of the electrical signal, and a device for detecting a change in the induction voltage of the first coil device. The second unit includes a second coil device adapted to be magnetically connected to the first coil device, a third coil device having a magnetic core formed of a temperature sensing magnetic material to form a resonance circuit in cooperation with the second coil device, and a switch mechanism for changing a time constant of the resonance circuit in response to a change in air pressure in a tire. With this construction, the abnormal reduction in air pressure in the tire and/or the abnormal increase in temperature of the tire can be detected.
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